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WO2025083489A1 - Valve de réglage pour ajuster l'écoulement de fluide - Google Patents

Valve de réglage pour ajuster l'écoulement de fluide Download PDF

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Publication number
WO2025083489A1
WO2025083489A1 PCT/IB2024/059295 IB2024059295W WO2025083489A1 WO 2025083489 A1 WO2025083489 A1 WO 2025083489A1 IB 2024059295 W IB2024059295 W IB 2024059295W WO 2025083489 A1 WO2025083489 A1 WO 2025083489A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
dosing
fluid
piston
cylinder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/IB2024/059295
Other languages
English (en)
Inventor
Thomas A. Edwards
Benjamin A. Pratt
Dominic Nolan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Solventum Intellectual Properties Co
Original Assignee
Solventum Intellectual Properties Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Solventum Intellectual Properties Co filed Critical Solventum Intellectual Properties Co
Publication of WO2025083489A1 publication Critical patent/WO2025083489A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/90—Negative pressure wound therapy devices, i.e. devices for applying suction to a wound to promote healing, e.g. including a vacuum dressing
    • A61M1/92—Negative pressure wound therapy devices, i.e. devices for applying suction to a wound to promote healing, e.g. including a vacuum dressing with liquid supply means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
    • F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
    • F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
    • F16K11/07—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
    • F16K31/1221—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston one side of the piston being spring-loaded
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/33—Controlling, regulating or measuring
    • A61M2205/3331—Pressure; Flow
    • A61M2205/3334—Measuring or controlling the flow rate
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
    • A61M39/22—Valves or arrangement of valves
    • A61M39/227—Valves actuated by a secondary fluid, e.g. hydraulically or pneumatically actuated valves

Definitions

  • NPWT Negative Pressure Wound Therapy
  • solutions or fluids, including medicines may also to delivered to the wounds for advanced cleaning and healing of the wounds.
  • Figure 1 illustrates a therapeutic environment, according to one example implementation of the present subject matter
  • Figures 2A and 2B illustrate a system fluidically coupled with a wound site, according to an example implementation of the present subject matter
  • Figure 3A illustrates a cross-sectional view of a control valve at a first terminal position, according to an example implementation of the present subject matter
  • Figure 3B illustrates a cross-sectional view of the control valve at a second terminal position, according to an example implementation of the present subject matter
  • Figure 4 illustrates an exploded view of the control valve, according to an example implementation of the present subject matter
  • Figure 5A illustrates a cross-sectional view of a dosing cylinder at a first extreme position, according to an example implementation of the present subject matter
  • Figure 5B illustrates a cross-sectional view of the dosing cylinder at a second extreme position, according to an example implementation of the present subject matter
  • Figure 6 illustrates an exploded view of the dosing cylinder, according to an example implementation of the present subject matter.
  • Figures 7A and 7B illustrate the dosing cylinder comprising a jackscrew, according to an example implementation of the present subject matter;
  • Figures 8A and 8B illustrate a dosing cylinder including a dosing chamber piston having multiple dosing chamber piston heads, according to an example implementation of the present subject matter.
  • Figures 9A and 9B illustrate a dosing cylinder comprising a dosing chamber piston with a hollow connecting member, according to an example implementation.
  • Negative pressure wound therapy (NPWT) systems have been developed for performing wound treatment by applying a suction or sub-atmospheric pressure towards a wound site, for instance, to help reduce inflammatory exudate, promote granulation tissue, and promote expedited healing of a wound. Additionally, the existing NPWT systems are configured to perform distribution of instillation fluids (also referred to as “instilling fluids”), towards the wound for cleaning and healing purposes. Owing to its advantages, the NPWT has become a widely recommended mode of treatment to patients in various cases, for example, in case of pressure ulcers, diabetic ulcers, and chronic (long-lasting) wounds or injuries.
  • the existing NPWT systems While the existing NPWT systems, being capable of performing distribution of instillation fluids for accelerating healing of the wounds, the existing NPWT systems have a complex setup with multiple components which require synchronized operation with each other for the NPWT systems to adequately operate.
  • the existing NPWT systems include complex valve mechanisms involving multiple electro -mechanically controlled valves. Such valves are required to be systematically and sequentially opened and closed so that fluid may only flow in a desired manner.
  • the existing NPWT systems generally include a storage chamber having multiple ports to receive the fluids, supply the fluids towards the wound site, and/or receive the suction or negative pressure.
  • Each of the ports is generally controlled by a dedicated valve to control ingress and egress of the fluids therefrom.
  • entry of the fluids into the storage chamber, egress of the fluids from the storage chamber, and application of negative pressure in the storage chamber is controlled by operating multiple valves. Therefore, synchronized operation of multiple valves may be necessary for appropriate or desired functionality of the existing NPWT systems.
  • each valve may have different cracking pressure and may open only when fluid with a desired pressure is received.
  • opening and closing of different valves may have to be synchronized by their cracking pressures for operating the existing NPWT systems adequately for performing the NPWT. Therefore, synchronizing operations of multiple valves may be complex and problematic in the existing NPWT systems.
  • Unsynchronized operation of one or more valves may lead to unintentional movement of the fluids, for example, towards or from the wound or components of the NPWT system. Such unintentional movement may lead to different consequences, for instance, damage to the wound and/or to the components of the NPWT system.
  • Such complex valve mechanisms also increase manufacturing time, complexity, and cost.
  • the existing or conventional NPWT systems are generally large and bulky in size, for example, owing to multiple valves. Accordingly, the use and application of the conventional NPWT systems may thus be limited to specific environments, for example, such facilities that have no limitation in terms of the space.
  • the present subject matter relates to a control valve, and a system comprising the control valve, for regulating flow of fluid in a controlled manner.
  • the system in one example, may be the NPWT system and the control valve may be fluidically coupled with the NPWT system.
  • the control valve may be integrated in the NPWT system or any device capable of performing the NPWT.
  • the system may include a dosing cylinder for receiving and supplying the fluid towards the wound site and the control valve to control flow of the fluid towards the dosing cylinder and the wound site.
  • the fluid may be received from a fluid supply unit that may be fluidically coupled with the control valve.
  • the fluid supply unit may include a fluid source capable of storing and supplying the fluid to the control valve or the system.
  • the fluid supply unit may be, in one example, located externally from the system. In another example, the fluid supply unit may be integrated within the system.
  • the dosing cylinder may include a dosing port for ingress of the fluid in the dosing cylinder and egress of the fluid from the dosing cylinder and a chamber pressure port to create pressure, for example, negative pressure inside the dosing cylinder.
  • the dosing cylinder may further include a returnable dosing chamber piston housed within the dosing cylinder.
  • the dosing chamber piston may be moveable between a first extreme position and a second extreme position inside the dosing cylinder.
  • the dosing chamber piston may be loaded over an elastic member to facilitate its returnable movement to the second extreme position from the first extreme position.
  • the negative pressure may be applied to the dosing cylinder, through the chamber pressure port, by a negative pressure generation unit.
  • the dosing chamber piston may move towards the first extreme position.
  • the first extreme position may be a position proximate to a base of the dosing cylinder.
  • such movement may because of vacuum being created due to application of the negative pressure, thus drawing the dosing chamber piston towards the base of the dosing cylinder.
  • the dosing chamber piston being loaded on the elastic member, may move or return towards the second extreme position.
  • the second extreme position may be a position proximate to the dosing port. While moving towards the first extreme position, the dosing chamber piston may create a volume, delineated by the dosing chamber piston and inner walls of the dosing cylinder, to receive the fluid through the dosing port. On the other hand, while moving towards the second extreme position, the dosing chamber piston is to shrink the volume to push the fluid out of the dosing cylinder through the dosing port.
  • control valve may be fluidically coupled with the dosing cylinder for controlling flow of the fluid into the dosing cylinder and from the dosing cylinder to the wound site.
  • the control valve in one example, may include a returnable valve piston and a valve pressure port.
  • the returnable valve piston may be moveable between a first terminal position and a second terminal position within a valve housing to control flow of the fluid into the dosing cylinder and from the dosing cylinder to the wound site.
  • the valve piston in one example, may be loaded over an elastic member to facilitate its returnable movement to the second terminal position from the first terminal position. In the first terminal position, the valve piston may allow transfer of the fluid, from a source of fluid, into the valve housing and towards the dosing cylinder.
  • the valve piston may restrict transfer of the fluid from the fluid supply unit and allow transfer of the fluid from the dosing cylinder towards the wound site.
  • the valve piston may be translated between the first terminal position and the second terminal position on application of negative pressure inside the valve housing through the valve pressure port. For instance, on application of the negative pressure, a suction force may be applied within the valve housing, causing the valve piston to move towards the first terminal position. However, on reduction or removal of negative pressure, the valve piston, being loaded on the elastic member, may move towards the second terminal position.
  • the valve piston By translating between the second terminal position and the first terminal position, the valve piston may facilitate controlled flow of the fluid into the dosing cylinder and from the dosing cylinder towards the wound site.
  • the negative pressure when a negative pressure may be applied by the negative pressure generation unit at the wound site for performing NPWT, the negative pressure may also be simultaneously transferred by the negative pressure generation unit to the control valve and the dosing cylinder through the valve pressure port and the chamber pressure port, respectively. Due to application of negative pressure at the chamber pressure port, the dosing chamber piston inside the dosing cylinder may start moving towards the first extreme position, creating a vacuum inside the dosing cylinder due to an expanding volume of the empty space, hereinafter referred to as volume. Owing to the negative pressure, the valve piston inside the control valve may start moving towards the first terminal position, thereby, allowing transfer of fluid from the source of fluid to the dosing port of the dosing cylinder.
  • the fluid may, thus, be received in the volume created inside the dosing cylinder.
  • the dosing chamber piston being returnable, may start moving towards the second extreme position, i.e., its original position, thereby shrinking the volume and pushing the fluid therein to move out of the dosing cylinder through the dosing port and towards the control valve.
  • the valve piston upon removal of the negative pressure, may also start moving towards the second terminal position, i.e., its original position, thereby directing the fluid being received from the dosing cylinder towards the wound site.
  • the present subject matter thus, provides a simplified structure to control flow of the fluid between the dosing cylinder and the wound site.
  • a system is provided that may perform the NPWT by eliminating requirement of multiple valves, and thereby necessity for sequencing and synchronizing operations of such multiple valves.
  • the present subject matter employs a single control valve having a valve piston enabling regulation of flow of the fluid towards the dosing cylinder and from the dosing cylinder towards the wound site. Since a single control valve is to be operated, operation complexity and chances of unwanted movement of the fluid towards any of the ports and/or the wound site may be low.
  • repair, maintenance, and manufacturing of the present system may require less time and effort due to its simplified structure and lesser number of components. Additionally, as fewer components are required, the system may be small and less bulky making it considerably portable such that it can be installed even at home or clinics.
  • FIG. 1 illustrates a therapeutic environment 100, according to one example implementation of the present subject matter.
  • the therapeutic environment 100 may comprise of a system 102 detachably coupled with a wound site 104.
  • the wound site 104 may be a tissue site having a wound 106 and a wound dressing 108.
  • the wound 106 may be a damaged or injured area located on the body of a living organism. Examples of the wound 106 may include, but are not limited to, a common chronic wound, an injury, and a non-healing type of wound.
  • the wound dressing 108 may be a medical dressing that may be placed over the wound 106 at the wound site 104.
  • the wound dressing 108 may be capable of substantially covering the wound 106 and at least partially forming a sealed enclosure over the wound 106.
  • the wound dressing 108 may be sealed to undamaged epidermis peripheral of the wound 106.
  • the wound dressing 108 may form a substantially sealed therapeutic environment over the wound 106.
  • the wound dressing 108 may at least partially isolate and protect the wound 106 from an external environment.
  • the system 102 may be detachably coupled with the wound dressing 108, for example, to assist healing and/or cleaning of the wound 106.
  • the system 102 may be configured to perform instillation therapy and negative pressure wound therapy (NPWT) to assist healing of the wound 106.
  • NGWT negative pressure wound therapy
  • the system 102 in one example, may be a portable system that may be carried by a user and detachably coupled with the wound dressing 108.
  • the user may be, for example, a doctor, a patient, a physician, or a healthcare worker.
  • the system 102 may be installed at a facility. Examples of the facility may include, but are not limited to, a hospital, a clinic, a medical office, and a house of a patient.
  • the system 102 may comprise of multiple components to perform the instillation therapy and the NWPT.
  • the system 102 may comprise of a negative pressure generation unit 110, a fluid supply unit 112, a dosing cylinder 114, and a control valve 116.
  • the negative pressure generation unit 110, the fluid supply unit 112, the dosing cylinder 114, and the control valve 116 may be fluidically interconnected, in one example, in such a manner that they collectively form a device.
  • some of the components may collectively form a device while other components may be externally and detachably connected to the device.
  • the dosing cylinder 114 and the control valve 116 may be fluidically connected and may collectively form a device, while the negative pressure generation unit 110 and the fluid supply unit 112 may externally and detachably connected to the device.
  • the negative pressure generation unit 110 may be a negative pressure source.
  • the negative pressure generation unit 110 may be reservoir of air at a negative pressure.
  • the negative pressure generation unit 110 may be a device capable of reducing pressure in a sealed volume. The device may be manual or electrically powered device. Examples of the negative pressure generation unit 110 may include, but are not limited to, a suction pump, a diaphragm pump, a wall suction port available at a healthcare facility, and a micro-pump.
  • the negative pressure generation unit 110 may be fluidically coupled with the wound dressing 108, the dosing cylinder 114, and the control valve 116.
  • the negative pressure generation unit 110 may be fluidically coupled with the wound dressing 108, the dosing cylinder 114, and the control valve 116 using one or more tubes, pipes, hoses, conduits, or other structures with one or more lumina adapted to convey a fluid between two ends.
  • the negative pressure generation unit 110 may be configured to apply a suction or sub-atmospheric pressure in the sealed volume, i.e., the wound dressing 108, the dosing cylinder 114, and the control valve 116, as will be discussed below.
  • the suction pressure being applied by the negative pressure generation unit 110 may be controllable in order to control the suction force or the negative pressure being applied.
  • the negative pressure generation unit 110 instead of being a part of the system 102, may be located externally from the system 102 and may be detachably coupled with the system 102 in such a manner that it may be in fluid communication with at least one of the wound dressing 108, the dosing cylinder 114, and the control valve 116.
  • different type of negative pressure generation unit 110 may be coupled with the system 102 based on requirements, for example, negative pressure requirements associated with performing NPWT. Also, in case of malfunctioning of the negative pressure generation unit 110, replacing the same with another negative pressure generation unit may be convenient.
  • the fluid supply unit 112 may comprise of a reservoir of a fluid.
  • the fluid supply unit 112 may be an intravenous fluid bag that may supply fluid stored therein due to force of gravity.
  • the fluid may be, for example, instillation fluid or a medicinal fluid.
  • the fluid supply unit 112 may include a device to supply the fluid stored in the reservoir with a pressure.
  • the device may be, for example, a pump capable of supplying the fluid with a pressure from the reservoir.
  • the fluid supply unit 112 may be a high-pressure fluid source.
  • the fluid supply unit 202 may be a wall supply port available at a healthcare facility, an oxygen cylinder, an oxygen pipeline, or other containers that may contain any liquid or gas.
  • the fluid supply unit 112 may be fluidically coupled with one or more components of the system 102. In one example, the fluid supply unit 112 may at least be fluidically coupled with the control valve 116. The fluid supply unit 112 may be fluidically coupled with the control valve 116 using one or more tubes, pipes, hoses, conduits, or other structures with one or more lumina adapted to convey a fluid between two ends. The fluid supply unit 112 may also be in indirect fluid communication with dosing cylinder 114. For example, the fluid supply unit 112 may be fluidically coupled with the dosing cylinder 114 over the control valve 116.
  • control valve 116 may be configured to regulate flow of the fluid between different components of the system 102.
  • the control valve 116 may be fluidically coupled with the dosing cylinder 114 and may control flow of the fluid, such as the fluid from the fluid supply unit 112, towards the dosing cylinder 114 and from the dosing cylinder towards the wound site 104.
  • the control valve 116 may include, in one example, a valve piston 118 that may be movable within the control valve 116 to control the flow of the fluid.
  • the valve piston 118 may translate between a first terminal position and a second terminal position. When at the first terminal position, the valve piston 118 may allow transfer of the fluid towards the dosing cylinder. However, when the valve piston 118 is at the second terminal position, the valve piston 118 may allow transfer of the fluid from the dosing cylinder 114 to the wound site 104.
  • valve piston 118 For causing movement of the valve piston 118 between the first extreme position and the second extreme position, pressure may be applied to the control valve 116.
  • the valve piston 118 may be translated between the first terminal position and the second terminal position by applying negative pressure from the negative pressure generation unit 110. For instance, on receiving the negative pressure, a suction force may be created within the control valve 116 causing the valve piston 118 to move towards the first terminal position. However, on reduction or removal of negative pressure, the valve piston 118 may move towards the second terminal position.
  • the dosing cylinder 114 may be configured to receive and supply the fluid towards the wound site 104.
  • the dosing cylinder 114 may receive the fluid from the control valve 116, store the fluid received, and supply the fluid towards the wound site 104 through the control valve 116.
  • the dosing cylinder 114 may include a dosing chamber piston 120 that may translate within the dosing cylinder to control reception of the fluid into the dosing cylinder 114 and supply of the fluid from the dosing cylinder 114.
  • the dosing chamber piston 120 may be moveable between a first extreme position and a second extreme position inside the dosing cylinder 114.
  • the dosing chamber piston 120 while moving towards the first extreme position, may create a volume delineated by the dosing chamber piston 120 and inner walls of the dosing cylinder 114 to receive the fluid from the control valve 116 in the volume. Whereas, while moving towards the second extreme position, the dosing chamber piston 120 may shrink the volume to push the fluid out of the dosing cylinder and towards the control valve 116.
  • pressure may be applied to the dosing cylinder 114.
  • the movement of the dosing chamber piston 120 may be caused by supplying a negative pressure from the negative pressure generating unit 110. On application of the negative pressure, the dosing chamber piston 120 may move towards the first extreme position. Whereas, on reducing or removing the negative pressure, the dosing chamber piston 120 may move or return towards the second extreme position.
  • the negative pressure generation unit 110 may supply a negative pressure at the wound site 104 to perform the NPWT. Being in fluid communication with the control valve 116 and the dosing cylinder 114, the negative pressure may also be transferred to the control valve 116 and the dosing cylinder 114. Due to the negative pressure, the dosing chamber piston 120 may start moving towards the first extreme position, creating the volume inside the dosing cylinder 114. Also, the valve piston 118 may start moving towards the first terminal position. Being at the first terminal position, the valve piston 118 may allow transfer of the fluid, being received from the fluid supply unit 112, to the dosing cylinder 114. The dosing cylinder 114 may receive and store the fluid in the volume created therein.
  • the dosing chamber piston 120 may start moving towards the second extreme position, thereby shrinking the volume and pushing the fluid to move out of the dosing cylinder 114 and towards the control valve 116.
  • the valve piston 118 may also start moving towards the second terminal position, thereby directing the fluid being received from the dosing cylinder 114 towards the wound site 104. The fluid may thus be supplied to the wound site 104 to assist healing of the wound 106.
  • Figures 2A and 2B illustrate the system 102 fluidically coupled with the wound site 104, according to an example implementation of the present subject matter.
  • the system 102 may be used in a therapeutic environment, such as the therapeutic environment 100, for assisting healing of wounds.
  • the system 102 may be fluidically and detachably coupled with the wound dressing 108 to assist healing of the wound 106 located at the wound site 104.
  • the system 102 may be coupled with the wound dressing 108 using, for example, tubes, pipes, hoses, conduits, or other structures with one or more lumina adapted to convey a fluid between two ends.
  • the system 102 may comprise of multiple components to assist healing of the wound 106.
  • the system 102 may comprise of the negative pressure generation unit 110, the fluid supply unit 112, the dosing cylinder 114, and the control valve 116, as discussed above.
  • a cross-sectional view of the control valve 116 and the dosing cylinder 114 has been illustrated in Figures 2A and 2B.
  • the components of the system 102 may be detachably and fluidically interconnected, as illustrated in Figures 2 A and 2B.
  • the negative pressure generation unit 110, the fluid supply unit 112, the dosing cylinder 114, and the control valve 116 may be detachably and fluidically connected using tubes adapted to convey fluid.
  • the negative pressure generation unit 110 may be detachably and fluidically coupled with the control valve 116 using a first tube 202-1 and with the dosing cylinder 114 using a second tube 202-2.
  • the negative pressure generation unit 110 may also be detachably and fluidically coupled with the wound dressing 108 using a third tube 202-3, as illustrated in Figure 2A, to apply sub-atmospheric pressure at the wound site 104.
  • Arrows in the first tube 202-1, the second tube 202-2, and the third tube 202-3 indicate direction of flow of the fluid present in the tubes.
  • direction of the fluid may be towards the negative pressure generation unit 110 as the negative pressure generation unit 110 may be drawing the fluid, such as air, present in the first tube 202-1, the second tube 202-2, and the third tube 202-3 towards itself.
  • the arrows in the first tube 202-1, the second tube 202-2, and the third tube 202-3 have thus been illustrated in Figure 2A to indicate the direction of flow of the fluid in the first tube 202-1, the second tube 202-2, and the third tube 202-3.
  • direction of flow of the fluid may effectively be away from the negative pressure generation unit 110, as illustrated by arrows in the first tube 202-1 and the second tube 202-2 in Figure 2B.
  • the direction of the flow of fluid may be effectively away due to movement of the valve piston 118 and the dosing chamber piston 120 when the suction or negative pressure is no longer being applied, as will be discussed.
  • the fluid supply unit 112 may be detachably and fluidically coupled with the control valve 116 using a fourth tube 202-4.
  • the fluid supply unit 112 may be capable of supplying a fluid towards the control valve 116.
  • the fluid may be any gas, liquid, or semi-liquid fluid.
  • the fluid may be oxygen, instillation fluid, a medicinal fluid, or any possible combination thereof.
  • control valve 116 may control flow of the fluid between different components of the system 102.
  • the control valve 116 may control flow of the fluid, such as the fluid being received from the fluid supply unit 112, towards the dosing cylinder 114 and from the dosing cylinder 114 towards the wound site 104.
  • the control valve 116 may include a valve housing 204.
  • the valve housing 204 may be, for example, a hollow housing.
  • a returnable valve piston, such as the valve piston 118, may be housed within the valve housing 204.
  • the valve piston 118 may control flow of the fluid towards the dosing cylinder 114 and from the dosing cylinder 114 towards the wound site 104, as will be discussed below.
  • valve housing 204 may include multiple ports to receive and exchange fluid with different components, such as the dosing cylinder 114 and the wound dressing 108 located at the wound site 104.
  • the valve housing 204 may include an inlet port 206, a fluid exchange port 208, an outlet port 210, and a valve pressure port 212.
  • the inlet port 206 may be fluidically coupled with the fluid supply unit 112 to receive the fluid from the fluid supply unit.
  • the inlet port 206 and the fluid supply unit 112 may be fluidically coupled, for example, by the fourth tube 202-4.
  • the fluid exchange port 208 may facilitate exchange of the fluid between different components of the system 102.
  • the fluid exchange port 208 may facilitate exchange of the fluid between the control valve 116 and the dosing cylinder 114. That is, the fluid exchange port 208 may fluidically couple the control valve 116 and the dosing cylinder 114 and may facilitate in providing the fluid from the control valve 116 towards the dosing cylinder 114 and from the dosing cylinder 114 to the control valve 116.
  • the fluid exchange port 208 may be fluidically coupled with the dosing cylinder 114 using a fifth tube 202-5. Furthermore, the outlet port 210 may facilitate transfer of the fluid from the control valve 116 to other components of the system 102, such as a cannister (not shown), a fluid storage unit (not shown), or the wound site 104. In one example, the outlet port 210 may facilitate transfer of the fluid from the control valve 116 towards the fluid storage unit configured to store the fluid. In another example, the outlet port 210 may facilitate transfer of the fluid, received from the dosing cylinder 114, from the control valve 116 towards the wound site 104.
  • the outlet port 210 may be fluidically coupled with the wound site 104, for example, by using a sixth tube 202-6, thereby fluidically coupling the control valve 116 with the wound site 104.
  • a safety valve 214 may be fhiidically coupled with the sixth tube 202-6 to ensure that the fluid may only move towards the wound site 104.
  • the safety valve may prevent, or at least restrict, reverse flow of the fluid, i.e., from the wound site 104 towards the control valve 116.
  • the safety valve 214 may be a manually operated valve or an electrically actuatable valve. Examples of the safety valve 214 may include, but are not limited to, a ball valve, a butterfly valve, a check valve, a globe valve, a needle valve, a pinch valve, and a gate valve.
  • valve pressure port 212 may be detachably and fhiidically coupled with the negative pressure generation unit 110, for example, by using the first tube 202-1.
  • the negative pressure generation unit 110 may create negative pressure inside the valve housing 204 through the valve pressure port 212.
  • the valve housing 204 may include the valve piston 118 that may retractably move within the valve housing 204.
  • the valve piston 118 may be, in one example, loaded on an elastic member 216 to facilitate the retractable movement within the valve housing 204.
  • the elastic member 216 may include, but are not limited to, a spring, a rubber cartridge, and an elastic band.
  • the elastic member 216 has been illustrated as a spring in Figures 2A and 2B.
  • the valve piston 118 may be loaded over a rubber cartridge to retractably move within the valve housing 204.
  • the valve piston 118 may be a pneumatically operated piston that may translate within the valve housing 204 due to action of a fluid, such as air.
  • the valve piston 118 may retractably move within the valve housing 204 due to change in pressure inside the valve housing 204.
  • the pressure may change, for example, due to application and removal of pressure via the valve pressure port 212.
  • the elastic member 216 generally tends to retain their original state when no significant pressure or force is being applied on them. For instance, when a spring may be pushed, the spring may undergo compression, however, when the force is removed, the spring tends to attain its original state, say extend or stretched state.
  • other type of elastic members such as rubber, tend to retain their original shape and state on removal of force.
  • valve piston 118 may be loaded on the elastic member 216, change in pressure inside the valve housing 204 may cause change in force experienced by the valve piston 118, and thereby the elastic member 216. Being loaded on the elastic member 216, the elastic member 216 may also experience the force and accordingly undergo stretching or compression within the valve housing 204, thereby causing translation of the valve piston 118 within the valve housing 204.
  • the valve pressure port 212 may be fluidically coupled with the negative pressure generation unit 110, application of negative pressure may reduce pressure inside the valve housing 204. Due to reduction in pressure, the valve piston 118 may experience a downward pulling force.
  • the elastic member 216 may also experience the pulling force being applied on the valve piston 118, thereby causing compression of the elastic member 216, say in a direction towards the valve pressure port 212. Compression of the elastic member 216 may cause downward movement of the valve piston 118.
  • force experienced by the valve piston 118 may be reduced and the elastic member 216 may accordingly initiate attaining its original state, thereby causing upward movement of the valve piston 118, i.e., towards the inlet port 206.
  • Application or change of pressure via the valve pressure port 212 may thus cause movement of the valve piston within the valve housing 204.
  • valve piston 118 may include, in one example, a piston head 218 integrated with an elongated valve body 220.
  • the piston head 218, in one example, may be coupled with the elastic member 216.
  • the elongated valve body 220 may include a valve stem 222 connecting the valve body 220 to the piston head 218.
  • the valve body 220 may further include a first valve member 224 and a second valve member 226.
  • the first valve member 224 may be at an end of the valve stem 222 distal to connection of the valve stem 222 and the piston head 218, and the second valve member 226 may be on the valve stem 222 at a point between the first valve member 224 and the piston head 218.
  • Translation of the valve piston 118 may thus cause translation of the first valve member 224 and the second valve member 226 within the valve housing 204. Translation of the valve piston 118, and thereby the first valve member 224 and the second valve member 226, may lead to opening and closing of different ports, such as the inlet port 206, the fluid exchange port 208, and the outlet port 210, as will be discussed below.
  • control valve 116 may be detachably and fhiidically coupled with the dosing cylinder 114.
  • the dosing cylinder 114 may include a dosing port 228 fhiidically coupled with the fluid exchange port 208 of the control valve 116 by using the fifth tube 202-5.
  • the dosing port 228, in one example, may facilitate ingress of the fluid in the dosing cylinder 114 from the control valve 116 and egress of the fluid from the dosing cylinder 114 towards the control valve 116.
  • the dosing cylinder 114 may further include, in one example, a chamber pressure port 230 and a returnable dosing chamber piston, such as the dosing chamber piston 120, housed within the dosing cylinder 114.
  • the chamber pressure port 230 may be detachably and fhiidically coupled with the negative pressure generation unit 110, for example, by the second tube 202-2.
  • the negative pressure generation unit 110 may create negative pressure inside the dosing cylinder 114 through the chamber pressure port 230.
  • the dosing chamber piston 120 may retractably move within the dosing cylinder 114.
  • the dosing chamber piston 120 may be, in one example, coupled with an elastic member 232 to facilitate the retractable movement.
  • the elastic member 232 may include, but are not limited to, a spring, a rubber cartridge, and an elastic band.
  • the elastic member 232 has been illustrated as a spring in Figures 2A and 2B.
  • the dosing chamber piston 120 may be a pneumatically operated piston that may translate within the dosing cylinder 114 due to action of any fluid, such as air.
  • the elastic member 232 may be similar to the elastic member 216 discussed above. In another member, the elastic member 232 may be different than the elastic member 216.
  • the dosing chamber piston 120 may translate within the dosing cylinder 114 due to change in pressure inside the dosing cylinder 114.
  • the dosing chamber piston 120 may translate due to application and removal of pressure via the chamber pressure port 230.
  • Change in pressure inside the dosing cylinder 114 may cause change in force experienced by the dosing chamber piston 120 and thereby the elastic member 232.
  • the elastic member 232 may accordingly undergo stretching or compression within the dosing cylinder 114, thereby causing translation of the dosing chamber piston 120 within the dosing cylinder 114.
  • the chamber pressure port 230 may be fhiidically coupled with the negative pressure generation unit 110, in one example, application of negative pressure may reduce pressure inside the dosing cylinder 114. Due to reduction in pressure, the dosing chamber piston 120 may experience a downward pulling force. Being loaded on the elastic member 232, the elastic member 232 may also experience the pulling force being applied on the dosing chamber piston 120, thereby causing compression of the elastic member 232, say in a direction towards the chamber pressure port 230. Compression of the elastic member 223 may cause downward movement of the dosing chamber piston 120.
  • the force experienced by the dosing chamber piston 120 may reduce and the elastic member 232 may initiate attaining its original state, thereby causing upward movement of the dosing chamber piston 120, i.e., towards the dosing port 228.
  • Application or change of pressure via the chamber pressure port 230 may thus cause movement of the dosing chamber piston within the dosing cylinder 114.
  • downward movement of the dosing chamber piston 120 may create a volume 234 delineated by the dosing chamber piston 120 and inner walls of the dosing cylinder 114 to receive the fluid, through the dosing port 228, in the volume 234.
  • upward movement of the dosing chamber piston 120 may shrink the volume 234, thereby pushing the fluid received in the volume 234 out of the dosing cylinder 114 via the dosing port 228.
  • the fluid, egressing from the dosing port 228, may be received by the fluid exchange port 208 of the control valve 116.
  • valve piston 118 and the dosing chamber piston 120 may not experience significant downward pulling force.
  • the elastic member 216 and the elastic member 232, respectively, may thus be in their original, or stretched position, as illustrated in Figure 2B.
  • the valve piston 118, being loaded on the elastic member 216, and the dosing chamber piston 120, being loaded on the elastic member 232, may thus be held at respective positions by the elastic members.
  • the first valve member 224 may abut against the inlet port 206, as illustrated in Figure 2B.
  • the position at which the first valve member 224 may abut against the inlet port 206 may hereinafter be referred to as a second terminal position of the valve piston 118.
  • the inlet port 206 may be blocked, thereby restricting flow of the fluid from the fluid supply unit 112 into the valve housing 204.
  • the dosing chamber piston 120 may abut against the dosing port 228, as illustrated in Figure 2B.
  • the position at which the dosing chamber piston 120 abuts against the dosing port 228, may hereinafter be referred to as a second extreme position of the dosing chamber piston 120.
  • the dosing port 228 may be blocked, thereby restricting flow of the fluid into the dosing cylinder 114.
  • the negative pressure generation unit 110 may supply a negative pressure at the wound site 104. Being in fluid communication with the valve pressure port 212 of the control valve 116 and chamber pressure port 230 of the dosing cylinder 114, the negative pressure may also be transferred to the control valve 116 and the dosing cylinder 114. Application of the negative pressure may pull the dosing chamber piston 120 towards a base 236 of the dosing cylinder 114. Pulling of the dosing chamber piston 120 may apply a compression force on the elastic member 232.
  • the elastic member 232 may undergo compression and the dosing chamber piston 120 may start moving towards, for example, in a downward direction towards the base 236. That is, downward movement of the dosing chamber piston 120 may be initiated when the negative pressure being applied by the negative pressure generation unit 110 may be sufficient to at least overcome the restoring force of the elastic member 232.
  • the restoring force may be a counter force self-applied by the elastic member 232 opposing compression of the elastic member 232 to remain in its original or stretched state. Once the negative pressure sufficient to overcome the restoring force may be applied, the dosing chamber piston 120 may start the downward movement and move towards a first extreme position.
  • the first extreme position may be a position, within the dosing cylinder 114, at which the dosing chamber piston 120 abuts against the base 236 of the dosing cylinder 114, as illustrated in Figure 2A.
  • the first extreme position may be a position at which the dosing chamber piston 120 may be proximate to the base 236.
  • the dosing chamber piston 120 may move downwards and towards the first extreme position, the dosing chamber piston 120 may no longer be abut against the dosing port 228.
  • movement of the dosing chamber piston 120 towards the first extreme position may create the volume 234 within the dosing cylinder 114. As dosing chamber piston 120 continues to move downwards, the volume 234 may keep increasing.
  • the valve piston 118 may also experience a pull towards a base 238 of the vale housing 204. Pulling of the valve piston 118 may apply a compression force on the elastic member 216. When the compression force is more than a restoring force of the elastic member 216, the elastic member 216 may undergo compression and the valve piston 118 may start moving in a downward direction. That is, downward movement of the valve piston 118 may be initiated when the negative pressure being applied by the negative pressure generation unit 110 may be sufficient to at least overcome the restoring force of the elastic member 216. Once the negative pressure sufficient to overcome the restoring force may be applied, the valve piston 118 may start the downward movement and move towards a first terminal position.
  • the first terminal position may be a position, within the valve housing 204, at which the piston head 218 of the valve piston 118 abuts against a bulging portion 240 formed on inner walls of the valve housing 204, as illustrated in Figure 2A.
  • the bulging portion 240 may act as a stopper to restrict further downward movement of the valve piston 118.
  • valve piston 118 may move towards the first terminal position and thereby away from the inlet port 206, the first valve member 224 may no longer be abut against the inlet port 206 and a valve chamber 242 may be formed between the first valve member 224 and the inlet port 206, as illustrated in Figure 2A.
  • the flow of fluid from the fluid supply unit 112 may thus not be restricted and the fluid may start entering the valve chamber 242 through the fourth tube 202-4.
  • the valve piston 118 may continue its downward movement and volume of the valve chamber 242 may keep increasing.
  • the piston head 218 may abut against the bulging portion 240 and further downward movement of the valve piston 118 may be restricted.
  • the first valve member 224 may not obstruct the fluid exchange port 208 and the fluid exchange port 208 may be opened for exchanging the fluid.
  • the fluid received via the inlet port 206 may be directed by the first valve member 224 towards the fluid exchange port 208.
  • the fluid exchange port 208 may be fhiidically coupled with the dosing port 228, flow of the fluid may be directed towards the dosing port 228 of the dosing cylinder 114.
  • the valve piston 118 may allow transfer of the fluid towards the dosing cylinder 114.
  • valve piston 118 and the dosing chamber piston 120 may no longer experience the pulling force.
  • the elastic member 216 and the elastic member 232, respectively may not experience the compression force and may thereby initiate movement, such as in an upward direction, to retain their stretched state. Movement of the valve piston 118 and the dosing chamber piston 120 may thus be initiated towards the second terminal position and the second extreme position, respectively.
  • valve piston 118 may be moveable at a higher speed, than the dosing chamber piston 120, to attain the second terminal position before the dosing chamber piston completely moves towards the second extreme position for facilitating transfer of the fluid between the dosing cylinder 114 and the wound site 104.
  • the dosing chamber piston 120 may shrink the volume 234 to push the fluid out of the dosing cylinder 114 through the dosing port 228.
  • the first valve member 224 may abut against the inlet port 206, thereby restricting reception of the fluid from the fluid supply unit 112.
  • a fluid flow path may be formed between the first valve member 224, the second valve member 226, and inner walls of the valve housing 204, as illustrated in Figure 2B.
  • the first valve member 224 and the second valve member 226 may have similar radius.
  • radius of the valve stem 222 may be lesser than the radius of the first valve member 224 and the second valve member 226. Due to difference in radius of the first valve member 224 and the valve stem 222, a gap may be created between the valve stem 222 and the inner walls of the valve housing 204. The gap may act as the fluid flow path, as illustrated in Figure 2B. Further, when at the second terminal position, the second valve member 226 on the valve stem 222 may direct the fluid being received in the gap, through the fluid exchange port 208, towards the outlet port 210. The second valve member 226 may thus act as a deflector to deflect or direct the flow of fluid towards the outlet port 210 and restrict flow of the fluid towards the piston head 218.
  • the arrows, indicated in Figure 2B, through the dosing port 228, the fifth tube 202-5, the fluid exchange port 208, the outlet port 210, and the sixth tube 202-6 indicate a complete flow of the fluid from the dosing cylinder 114 towards the wound site.
  • the fluid flow path may thus facilitate movement of the fluid across the valve stem 222 and from the fluid exchange port 208 towards the outlet port 210.
  • the fluid flow path may be formed by a through hole (not shown) on the valve stem 222 and between the first valve member 224 and the second valve member 226.
  • the present subject matter discloses a single valve, i.e., the control valve 116 that may be used for controlling transfer to fluid from the fluid supply unit 112 towards the dosing cylinder 114 and from the dosing cylinder 114 towards the wound site 104.
  • the present subject matter discloses a single control valve 116 having a single valve piston 118 capable of regulating flow of the fluid towards the dosing cylinder 114 and from the dosing cylinder 114 towards the wound site 104.
  • the present subject matter may thus provide a less complex technique to control flow of the fluid between the dosing cylinder 114 and the wound site 104 by eliminating requirement of multiple valves, and thereby any requirement for multiple valve sequencing.
  • Figure 3 A illustrates a cross-sectional view of the control valve 116 at the first terminal position, according to an example implementation of the present subject matter.
  • Figure 3B illustrates a cross-sectional view of the control valve 116 at the second terminal position, according to an example implementation of the present subject matter.
  • Figures 3A and 3B will be discussed below along with reference to Figure 4.
  • Figure 4 illustrates an exploded view 400 of the control valve 116, according to an example implementation of the present subject matter.
  • the control valve 116 may be used for controlling the flow of fluid towards different components in any environment.
  • control valve 116 may be used to control flow of the fluid into the dosing cylinder 114 and from the dosing cylinder 114 towards the wound site 104.
  • control valve 116 may be used in an industry to control flow of fluid among different components located within the industry.
  • control valve 116 may be used in a power plant for controlling flow of a fluid towards a boiler and flow of steam from the boiler towards a generator.
  • use of the control valve 116 may not be limited to any specific industry.
  • the control valve 116 may be used in different industries, such as process industries, healthcare industry, and refineries.
  • the control valve 116 may include a valve housing, such as the valve housing 204.
  • the valve housing 204 may be formed by coupling a hollow top cylinder 302 with a hollow base cylinder 304.
  • the top cylinder 302 coupled with the base cylinder 304 may thus collectively be referred to as the valve housing 204.
  • the valve housing 204 may have a height H and a diameter D.
  • the height H and a diameter D may be determined as per the requirements, for example, for filling the control valve 116 inside a device or a system.
  • the height H may be 92 millimeter (mm) and the diameter D may be 68 mm.
  • the top cylinder 302 may have a first section 306 and a second section 308 integrated with the first section 306.
  • width, or diameter, of the first section 306 may be narrower than width, or diameter, of the second section 308.
  • the first section 306 may have a smaller internal diameter than an internal diameter of the second section 308.
  • the first section 306 may thus form an elongated tubular structure integrated with a wider structure, i.e., the second section 308.
  • the first section 306 may include multiple ports.
  • the first section 306 may include the inlet port 206, the fluid exchange port 208, and the outlet port 210.
  • the inlet port 206 may located on a top wall 310 of the first section 306 and may be fhiidically coupled to a source of fluid, such as the fluid supply unit 112 to receive a fluid.
  • the fluid exchange port 208 may be located on a first wall 312 of the first section 306 to exchange the received fluid with a device fhiidically coupled with the fluid exchange port 208. Examples of the device may include, but are not limited to, the dosing cylinder 114, a boiler, or any form of fluid storage device.
  • the outlet port 210 in one example, may be located on a second wall 314 of the first section 306 and may release the fluid out of the outlet port 210.
  • the control valve 116 may further include a valve piston, such as the valve piston 118 housed within the valve housing 204.
  • the valve piston 118 may translate between the first terminal position and the second terminal position, as discussed above. In one example, the translation may be restricted within the top cylinder 302 by the bulging portion 240.
  • the valve piston 118 may include the piston head 218 integrated with the elongated valve body 220.
  • the piston head 218 When the valve piston 118 is located at the first terminal position, as illustrated in Figure 3A, the piston head 218 may be located within the second section 308 and the elongated valve body 220 may partially be located within the second section 308 and the first section 306.
  • the valve piston 118 may be located at the second terminal position, as illustrated in Figure 3B, the piston head 218 may be located within the second section 308 and the elongated valve body 220 may be located within the first section 306.
  • the elongated valve body 220 may include the valve stem 222 connecting the elongated valve body 220 to the piston head 218, the first valve member 224 located at an end of the valve stem 222 distal to connection of the valve stem 222 and the piston head 218, and the second valve member 226 located on the valve stem 222 at a point between the first valve member 224 and the piston head 218.
  • the elongated valve body 220 and the valve stem 222 may be cylindrical in shape and the piston head 218 may be in form of a circular disk, as illustrated in Figure 4. However, other shapes and geometries may also be possible.
  • first and the second valve member may have a similar diameter and may be cylindrical structures protruding outward from the valve stem 222.
  • the diameter of the first and the second valve member may be minutely smaller than the internal diameter of the first section 306.
  • the valve stem 222 has a relatively smaller diameter than the first and the second valve member.
  • a gap may be formed between the internal walls of the first section 306 and the valve stem 222, as illustrated in Figures 3A and 3B. The gap may act as a fluid flow path, as discussed above, to allow transfer of the fluid across the valve stem 222 and towards the outlet port 210.
  • the elongated valve body 220 may translate within the second section 308 and the first section 306. While translating, the first valve member 224 and the second valve member 226 of the elongated valve body 220 may interact with different ports to direct flow of the fluid towards one of the ports. For example, when the valve piston 118 attains the first terminal position (as illustrated in Figure 3 A), the first valve member 224 may be proximate to the fluid exchange port 208 and may no longer abut against the inlet port 206. The valve piston 118 may thus allow the fluid to enter the valve chamber 242. Also, the first valve member 224 may deflect or direct the flow of fluid towards the fluid exchange port 208.
  • the device such as the dosing cylinder 114, may be fhiidically coupled with the fluid exchange port 208 for receiving the fluid being directed by the first valve member 224.
  • the first valve member 224 may be located proximate to the inlet port and may substantially abut against the inlet port 206.
  • the flow of fluid from the inlet port 206 into the valve chamber 242 may thus be restricted.
  • transfer of the fluid may be allowed across the valve stem 222 and towards the outlet port 210.
  • the valve stem 222 may include the fluid flow path in form of a through hole, instead of the gap, to facilitate flow of fluid from the fluid exchange port 208 towards the outlet port 210.
  • the first and the second valve member may restrict seeping of fluid from between the internal walls of the first section 306 and the first and the second valve member.
  • the first valve member 224 may restrict seeping of the fluid from between the internal walls of the first section 306 and the first valve member 224, i.e., towards the second valve member 226 and the piston head 218.
  • the second valve member 226 may direct the flow of fluid towards the outlet port 210 and restrict seeping of the fluid from between the internal walls of the first section 306 and the second valve member 226, i.e., towards the piston head 218 and the base cylinder 304.
  • one or more sealing members may also be used to restrict seeping of the fluid.
  • the valve piston 118 may include a first set of sealing members 316 located on the first valve member 224, a second sealing member 318 located on the second valve member 226, and a third sealing member 320 located on the piston head 218.
  • the first set of sealing members 316, the second sealing member 318, and the third sealing member 320 may be O-rings, as illustrated in Figure 4.
  • the size, or diameter, of the O-rings may be determined based on the diameter of the first valve member 224, the second valve member 226, and the piston head 218.
  • the O-rings may facilitate in forming an efficient seal between the valve members and the internal walls of the valve housing 204 to prevent seeping of the fluid.
  • Other known type of sealing members or mechanical gaskets may also be used for preventing seeping of the fluid.
  • the third sealing member 320 may also form air-tight barrier to facilitate efficient application of the negative pressure inside the control valve 116.
  • the third sealing member 320 may form an air-tight barrier, or seal, between the piston head 218 and internal walls of the control valve 116.
  • By forming the air-tight barrier seeping or leakage of the negative pressure, towards the valve body 220, may be prevented from between the piston head 218 and the internal walls of the control valve 116. Preventing such leakages may enable efficient creation of vacuum for drawing the valve piston 118 towards the first terminal position.
  • control valve 116 may also include the valve pressure port 212 that may be used for modifying pressure inside the valve housing 204.
  • the valve pressure port 212 may be located on a base, such as the base 238 of the base cylinder 304.
  • the valve pressure port 212 may be fluidically coupled with the negative pressure generation unit 110 to apply a negative pressure inside the valve housing 204. Application and removal of the negative pressure may cause the translation, as discussed above, of the valve piston 118 within the valve housing 204.
  • the valve piston 118 may further be coupled with an elastic member, such as the elastic member 216 that may facilitate translation of the valve piston 118 in a retractable manner. That is, the elastic member 216 may facilitate return of the valve piston 118, for example to the second terminal position, on removal of application of the negative pressure, as discussed above.
  • the hollow base cylinder 304 may house the elastic member 216.
  • a first end 322 of the elastic member 216 may be coupled to an interior side 324 of the base 238 of the base cylinder 304 and a second end 326 may be coupled with the piston head 218, as illustrated in Figure 4.
  • Figure 5A illustrates a cross-sectional view of the dosing cylinder 114 at the first extreme position, according to an example implementation of the present subject matter.
  • Figure 5B illustrates a cross-sectional view of the dosing cylinder 114 at the second extreme position, according to an example implementation of the present subject matter.
  • Figures 5 A and 5B will be discussed below along with reference to Figure 6.
  • Figure 6 illustrates an exploded view 600 of the dosing cylinder 114, according to an example implementation of the present subject matter.
  • the dosing cylinder 114 may be configured for receiving, storing, and supplying the fluid towards a wound site, such as the wound site 104.
  • the dosing cylinder 114 may be configured for supplying the fluid towards any other component that may be fhiidically coupled with the dosing cylinder 114.
  • the other components may be components to which supply of the fluid may be intended. Examples of the other components may include, but are not limited to, a burner, a refinery, a fuel reformer, or a turbine.
  • the dosing cylinder 114 may be a hollow housing.
  • the dosing cylinder 114 may be formed, in one example, by coupling a hollow first cylinder 502 with a hollow second cylinder 504.
  • the first cylinder 502 and the second cylinder 504, in one example, may be cylindrical in shape, as illustrated in Figure 6.
  • the dosing cylinder 114 may thus be, in one example, cylindrical in shape. However, other shapes and geometries of the dosing cylinder 114 may also be possible.
  • the dosing cylinder 114 may include the dosing port 228 and the chamber pressure port 230, as discussed above. In one example, the dosing port 228 may be located on a top wall 506 of the dosing cylinder 114.
  • the dosing port 228 may enable ingress of the fluid in the dosing cylinder 114 and egress of the fluid from the dosing cylinder 114, as discussed above. Further, the dosing cylinder 114 may also include the chamber pressure port 230 located proximate to the base 238 of the dosing cylinder 114. The chamber pressure port 230 may enable modification of pressure inside the dosing cylinder 114, as discussed above.
  • the dosing cylinder 114 may further include the dosing chamber piston 120.
  • the dosing chamber piston 120 in one example, may include a dosing chamber piston head 508 and an elongated piston stem 510 integrated with the dosing chamber piston head 508.
  • the piston stem 510 may be spooled with the elastic member 232 to facilitate the dosing chamber piston 120 to retractably move between the second extreme position and the first extreme position, as discussed above.
  • the dosing cylinder 114 may include a dosing chamber piston having multiple interconnected dosing chamber piston heads, as illustrated in Figures 8A and 8B and discussed below.
  • the piston stem 510 may include a cavity 512 formed therebetween and may be placed over a protruding member 514 such that the cavity 512 receives the protruding member 514.
  • the protruding member 514 may be located on, or integrated with, the base 238 of the dosing cylinder 114 and may extend within the second cylinder 504, as illustrated in Figure 6. While translating between the first and the second extreme position, the piston stem 510 is to travel along the length of the protruding member 514.
  • the protruding member 514 may thus provide stability to the dosing chamber piston 120 while translating between the first extreme position and the second extreme position. Further, in one example, the protruding member 514 may create a cavity 516 therebetween.
  • the cavity 516 may start from the base 238 and may extend deep within the second cylinder 504.
  • the cavity 516 may be configured to house, at least partially, a jackscrew, as illustrated in Figures 7A and 7B.
  • Figures 7A and 7B illustrate the dosing cylinder 114 comprising a jackscrew 702, according to an example implementation of the present subject matter.
  • the jackscrew 702 may include a lead screw 704 and a threaded nut 706 located proximate to the base 238.
  • the lead screw 704 may have external screw threads 708 along a length thereof.
  • the threaded nut 706 may have internal screw threads (not shown) corresponding to the external screw threads 708 of the lead screw 704.
  • the threaded nut 706 may receive the lead screw 704 and may be movable, on rotation of the lead screw 704, along the length of the lead screw 704. In one example, when rotated in an anti-clockwise direction (as indicated by circular arrows 710 in Figure 7B), the threaded nut 706 may traverse in a direction towards the top wall 506 (as indicated by arrows 712 in Figure 7A). In one example, the piston stem 510 of the dosing chamber piston 120 may be mounted over the threaded nut 706. Similarly, when rotated in a clockwise, the threaded nut 706 may traverse in a direction away from the top wall 506.
  • the dosing chamber piston 120 may be mounted on the jackscrew 702, as illustrated in Figures 7A and 7B.
  • the piston stem 510 of the dosing chamber piston 120 may be in physical communication with the threaded nut 706.
  • position of the dosing chamber piston 120 within the dosing cylinder 114 may thus be adjusted.
  • the volume 234 may also get adjusted.
  • the lead screw 704 may be rotated in anti-clockwise direction to move the dosing chamber piston 120 in a direction towards the top wall 506, as illustrated in Figure 7B.
  • the volume 234 may thus accordingly reduce as distance between the top wall 506 and the dosing chamber piston 120 may reduce.
  • the volume 234 may be modified and accordingly a volume of fluid to be stored in the dosing cylinder 114 may be controlled.
  • Dosing volume i.e., the volume of the fluid to be delivered to the wound site 104, may therefore be controllable.
  • the dosing cylinder 114 may include one or more sealing members to restrict seeping of the fluid received in the volume 234.
  • a sealing member 518 may be located around the dosing chamber piston head 508 of the dosing chamber piston 120, as illustrated in Figure 5A and 5B.
  • the sealing member 518 in one example, may be an O-ring, as illustrated in Figure 6.
  • the size, or diameter, of the O-rings may be determined based on the diameter of the dosing chamber piston head 508.
  • the O-rings may facilitate in forming an efficient seal between the dosing chamber piston head 508 and internal walls of the dosing cylinder 114 to prevent seeping of the fluid received in the volume 234.
  • FIGS 8A and 8B illustrate a dosing cylinder 800 including a dosing chamber piston 802 having multiple dosing chamber piston heads, according to an example implementation of the present subject matter.
  • the dosing cylinder 800 may be configured to receive, store, and supply the fluid.
  • the dosing cylinder 800 may include a dosing port 804, a chamber pressure port 806, and an elastic member 808; and may function similarly to the dosing port 228, the chamber pressure port 230, and the elastic member 232 discussed above.
  • the dosing chamber piston 802 may include a first dosing chamber piston head 810 and a second dosing chamber piston head 812 coupled to the first dosing chamber piston head 810 by a connecting member 814.
  • the first dosing chamber piston head 810 and the second dosing chamber piston head 812 may have different diameters.
  • the first dosing chamber piston head 810 may have a larger diameter than the second dosing chamber piston head 812. With increased diameter, more surface area of the first dosing chamber piston head 810 may experience the pressure being applied.
  • the force experienced by the first dosing chamber piston head 810 may increase with increase in area, even when same amount of pressure is applied. It may also be implied, that a same amount of force may be achieved by reducing the pressure and accordingly increasing the area. Thus, with increased surface area, a reduced amount of pressure may be required to generate a force required to move the first dosing chamber piston head 810 (and the dosing chamber piston 802). For example, if the first dosing chamber piston head 810 has a diameter of 30 millimetre (mm) and a force of 10 Newton (N) is required to move, a pressure of 106mmHg may be required to move it.
  • mm millimetre
  • N 10 Newton
  • a negative pressure generation unit such as the negative pressure generation unit 110
  • a negative pressure generation unit such as a pump
  • hp horsepower
  • such negative pressure generation units may be compact, economical, and have less electrical power consumption, thereby enhancing efficiency of the overall system 102.
  • first dosing chamber piston head 810 may include a piston stem 816 integrated therewith and comprising a cavity 818 therebetween.
  • the piston stem 816 may be spooled with the elastic member 808 to facilitate returnable movement of the dosing chamber piston 802 between the first extreme position and the second extreme position, similarly to the dosing chamber piston 120.
  • a first section 820 of the dosing cylinder 800 may house the first dosing chamber piston head 810 and the piston stem 816 and a second section 822 of the dosing cylinder 800 may house the second dosing chamber piston head 812.
  • the second section 822 may also be configured to store the fluid being received by the dosing port 804.
  • translation of the dosing chamber piston 802 may cause translation of the first dosing chamber piston head 810 and the second dosing chamber piston head 812.
  • the first dosing chamber piston head 810, along with the piston stem 816, may retractably translate within the first section 820, as illustrated. Translation of the first dosing chamber piston head 810 may be restricted within the first section 820 by walls of the first section 820.
  • first dosing chamber piston head 810 may also cause translation of the second dosing chamber piston head 812, being coupled with the connecting member 814, within the second section 822.
  • first section 820 and the second section 822 may have different diameter and, thus, different volumes.
  • the first section 820 may have a larger diameter as compared to diameter of the second section 822. Volume of the first section 820 may therefore be more than volume of the second section 822.
  • Different volumes in the first and the second sections may be, in one example, because of the forces involved to compress the elastic member 808 required to overcome greater hydrostatic head heights. Further, the more the fluid is required or desired to be moved, the more powerful elastic member 808 may be needed to accordingly facilitate movement of the dosing chamber piston 802. As a result, more force may be required to be generated to move the dosing chamber piston 802 towards the first extreme position.
  • a larger lower piston i.e., the first dosing chamber piston head 810 would experience more force, thereby reducing the pressure required to move it, however having a smaller volume (i.e., volume of the second section 822) above means that force applied by the elastic member 808 (for example, a spring) may not be required to be changed in order to move the fluid.
  • the elastic member 808 for example, a spring
  • the dosing chamber piston 802 experiences a suction force, due to application of negative pressure via the chamber pressure port 806, the dosing chamber piston 802 moves towards a base 824 of the dosing cylinder 800 and the piston stem 816 may, subsequently, abut against the base 824, as illustrated in Figure 8A.
  • the second dosing chamber piston head 812 may longer abut against the dosing port 804 and entrance of the fluid may thus be allowed through the dosing port 804 into a volume 826, delineated by the dosing chamber piston 802 and inner walls of the dosing cylinder 800.
  • the dosing chamber piston 802 initiates movement towards the second extreme position to shrink the volume 826 and initiate ejection of the fluid stored therein.
  • the fluid being ejected may be provided to the other components fluidically coupled.
  • the fluid may be provided to the control valve 116.
  • the second dosing chamber piston head 812 may abut against the dosing port 804, as illustrated in Figure 8B, to completely eject the fluid received in the volume 826 and restrict further reception of the fluid.
  • first and the second dosing chamber piston heads may be coupled with one or more sealing members.
  • first dosing chamber piston head 810 may be coupled with a first sealing member 828 and the second dosing chamber piston head 812 may be coupled with a second sealing member 830.
  • the first and the second sealing members in one example, may be O-rings.
  • the size, or diameter, of the O-rings may be determined based on the diameter of the first dosing chamber piston head 810 and the second dosing chamber piston head 812. The O-rings may facilitate in forming an efficient seal between the dosing chamber piston heads and the internal walls of the dosing cylinder 800 to prevent seeping of the fluid.
  • the sealing members may also form air-tight barriers to facilitate efficient application of the negative pressure inside the dosing cylinder 800.
  • the first sealing member 828 may for an air barrier, or seal, between the first dosing chamber piston head 810 and internal walls of the first section 820 of the dosing cylinder 800.
  • the air barrier By forming the air barrier, seeping or leakage of the negative pressure, towards the second dosing chamber piston head 812, may be prevented from between the first dosing chamber piston head 810 and the internal walls of the first section 820. Preventing such leakages may enable efficient creation of vacuum for drawing the dosing chamber piston 802 towards the first extreme position. Also, load on the negative pressure generation unit 110 may be reduced.
  • the elastic members may be coupled, or spooled, with the piston stem 816 of the dosing chamber piston 802.
  • the elastic members may be disposed within the dosing chamber pistons, as exemplarily illustrated in Figures 9A and 9B.
  • Figures 9A and 9B illustrate a dosing cylinder 900 comprising a dosing chamber piston with a hollow connecting member, according to an example implementation.
  • the dosing chamber piston 902 may include a first dosing chamber piston head 904 and a second dosing chamber piston head 906, similar to the dosing chamber piston 802.
  • the first dosing chamber piston head 904 and the second dosing chamber piston head 906 may be coupled with each other using a hollow connecting member 908, similar to the connecting member 814.
  • the connecting member 814 may be a hollow body.
  • An elastic member 910 may be disposed within the connecting member 908 such that a first end of the elastic member 910 may be connected with the first dosing chamber piston head 904 and a second end of the elastic member 910 may be connected to a top wall 912 proximate to a dosing port 914, similar to the dosing port 228 and the dosing port 804. Disposing the elastic member 910 within the connecting member 908 may reduce the length of the dosing cylinder 900 required.
  • the dosing chamber piston 902 may thus have to travel a reduced distance to attain the first extreme position, illustrated in Figure 9A, and the second extreme position, illustrated in Figure 9B.
  • the number of cycles, i.e., movement between the first extreme position and the second extreme position, per unit time may thereby increase.
  • the dosing cylinder 900 may be capable of supplying more fluid towards the wound site 104, per unit time.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Anesthesiology (AREA)
  • Vascular Medicine (AREA)
  • Biomedical Technology (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Surgical Instruments (AREA)

Abstract

L'invention concerne un système comprenant un cylindre doseur et une valve de réglage. Le cylindre doseur comprend un orifice de dosage pour l'entrée et la sortie d'un fluide et un piston de chambre de dosage rétractable. La valve de réglage comprend un logement de valve, un piston de valve rétractable et un orifice de pression de valve pour créer une pression négative à l'intérieur du logement de la valve. Lors de l'application d'une pression négative, le piston de la valve se déplace vers une première position terminale pour permettre le transfert du fluide vers le cylindre doseur et le piston de la chambre de dosage se déplace vers une première position extrême pour recevoir le fluide. Lors du retrait de la pression négative, le piston de la chambre de dosage se déplace vers une seconde position extrême pour pousser le fluide hors du cylindre doseur et le piston de la valve se déplace vers une seconde position terminale pour permettre le transfert du fluide vers un site de plaie et limiter le transfert du fluide vers le cylindre doseur.
PCT/IB2024/059295 2023-10-16 2024-09-24 Valve de réglage pour ajuster l'écoulement de fluide Pending WO2025083489A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US202363544258P 2023-10-16 2023-10-16
US63/544,258 2023-10-16

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WO2025083489A1 true WO2025083489A1 (fr) 2025-04-24

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PCT/IB2024/059295 Pending WO2025083489A1 (fr) 2023-10-16 2024-09-24 Valve de réglage pour ajuster l'écoulement de fluide

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190290813A1 (en) * 2016-06-03 2019-09-26 Kci Licensing, Inc. Negative-pressure therapy with disposable instillation pump chamber
US20210220531A1 (en) * 2017-07-18 2021-07-22 Kci Licensing, Inc. Negative-pressure therapy with adjustable instillation pump chamber

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190290813A1 (en) * 2016-06-03 2019-09-26 Kci Licensing, Inc. Negative-pressure therapy with disposable instillation pump chamber
US20210220531A1 (en) * 2017-07-18 2021-07-22 Kci Licensing, Inc. Negative-pressure therapy with adjustable instillation pump chamber

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