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WO2008068508A1 - Unité de soupape de sureté - Google Patents

Unité de soupape de sureté Download PDF

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Publication number
WO2008068508A1
WO2008068508A1 PCT/GB2007/004699 GB2007004699W WO2008068508A1 WO 2008068508 A1 WO2008068508 A1 WO 2008068508A1 GB 2007004699 W GB2007004699 W GB 2007004699W WO 2008068508 A1 WO2008068508 A1 WO 2008068508A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
safety valve
delivery tube
head
safety
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.)
Ceased
Application number
PCT/GB2007/004699
Other languages
English (en)
Inventor
Richard Radford
David Edgar Peel
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.)
BPR Medical Ltd
Original Assignee
BPR Medical Ltd
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 BPR Medical Ltd filed Critical BPR Medical Ltd
Publication of WO2008068508A1 publication Critical patent/WO2008068508A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/36—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position
    • F16K17/38—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position of excessive temperature
    • F16K17/383—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position of excessive temperature the valve comprising fusible, softening or meltable elements, e.g. used as link, blocking element, seal, closure plug
    • 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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes
    • A61M16/06—Respiratory or anaesthetic masks
    • A61M16/0666—Nasal cannulas or tubing
    • A61M16/0672—Nasal cannula assemblies for oxygen therapy
    • 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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes
    • A61M16/20—Valves specially adapted to medical respiratory devices
    • A61M16/208—Non-controlled one-way valves, e.g. exhalation, check, pop-off non-rebreathing valves
    • 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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/10—Means for stopping flow in pipes or hoses
    • F16L55/1022—Fluid cut-off devices automatically actuated
    • 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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/10—Means for stopping flow in pipes or hoses
    • F16L55/1026—Fire protection devices
    • 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
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes
    • A61M16/06—Respiratory or anaesthetic masks

Definitions

  • This invention relates generally to safety valve units and is specifically concerned with such units as are used in respirators for supplying oxygen to patients in hospitals, by emergency services and more particularly in the domestic environment where awareness of the danger resulting from the use of an oxygen- enriched environment may not be so readily appreciated.
  • Oxygen may be supplied in one of three ways, namely in compressed form in cylinders, from concentrators which extract oxygen from the atmosphere or as liquid oxygen, typically in a Dewar flask. Such sources are usually coupled via a delivery line to a face mask or nasal cannula.
  • oxygen may be supplied to a patient from a gas cylinder or from a concentrator
  • a risk of fire where, for example, a smoker's cigarette, or the like, may be alight in the vicinity of the respirator being used by a patient.
  • respiratory equipment such as safety valves, facemasks and nasal cannulas are usually disposable and therefore there is also a requirement to provide a safety valve unit which is inexpensive and easy to install.
  • the present invention provides a safety valve, for closing a flow path of a combustible fluid from a source upon detection of a fire in a delivery tube from the valve to a user, the said safety valve comprising a valve body and a valve head resiliency biased towards a valve-closure position, the valve body having means for receiving a fluid delivery tube of heat softenable material which, upon fitting, holds the valve head, against the bias, in a valve-open position such that the fluid delivery tube acts as a fusible member of the valve.
  • the valve body may define a fluid flow passage between an outlet and the said valve head.
  • the safety valve may further comprise an elongate member extending from the valve head to a foot, which engages the fluid delivery tube.
  • the delivery tube may be fitted over a connection spigot of the valve body and the foot of the link member.
  • the delivery tube may be fitted into the fluid flow passage and engage the valve body or a member carried thereby or in contact or engagement therewith. Whether the delivery tube is fitted over the connection spigot and the foot or fitted into the flow passage, the delivery tube may be a friction fit onto or into the valve body, or may be secured in place with an adhesive.
  • the delivery tube may be an oxygen delivery tube which delivers oxygen to a patient by way of a breathing assistance assembly such as, for example, a mask or nasal cannula.
  • the delivery tube may be formed from a thermoplastic material, such as, for example Polyvinylchloride (PVC).
  • a thermoplastic material such as, for example Polyvinylchloride (PVC).
  • the elongate link member may be a generally flat element and the fluid flow path defined between the elongate member and the wall of the fluid flow passage.
  • the elongate link member may have an aperture, extending in the direction of the longitudinal axis thereof, which defines a portion of the fluid flow path.
  • the elongate link member may be integrally formed with the valve head.
  • the valve head is preferably spherical having a surface at least part of which is formed of material which provides an annular sealing surface, the annular sealing surface being arranged to engage the internal annular surface of the fluid flow passage on release of the valve head.
  • valve head may be formed with an annular recess to receive an annular sealing member therein, the annular sealing member being arranged to engage the internal annular surface of the fluid flow passage on release of the valve member.
  • the foot may comprise at least one lateral protrusion and preferably two lateral protrusions which may be diametrically opposed across a plane of symmetry of the elongate link member.
  • the foot may comprise an annular flange.
  • the valve member may be spring-biased by a compression coil spring mounted within the body and compressed between an internal annular rim, provided by the body, and the valve head.
  • the valve body may also be suitable for receiving a supply tube, which may be connected to the body by way of a second spigot, or fitted into the valve body to provide fluid connection from a supply into the fluid flow passage.
  • the supply tube may be a friction fit onto or into the valve body or may be secured in place with an adhesive.
  • valve body may have a threaded fitting to cooperate with a threaded fitting disposed on a supply tube.
  • the present invention also encompasses breathing assistance apparatus including or incorporating a safety valve as described above.
  • the breathing assistance apparatus may be, for example, a breathing mask assembly or a nasal cannula assembly.
  • Figure 1 is a cross section of a safety valve according to a first embodiment of the present invention
  • Figure 2 is a perspective cross section of a safety valve according to a second embodiment of the present invention.
  • Figure 3 is a cross section of a safety valve according to a third embodiment of the present invention.
  • Figure 4 is a cross section of a safety valve according to a fourth embodiment of the present invention.
  • Figure 5 is a perspective view of a valve member of the safety valve of Figure 4;
  • Figure 6 is a perspective view of breathing assistance apparatus according to a fifth embodiment of the present invention.
  • Figure 7 is ⁇ perspective view of breathing assistance apparatus according to a sixth embodiment of the present invention.
  • the first embodiment of the invention comprises a safety valve 9 having an elongate hollow body 10, defining a fluid flow passage 1 1 between an inlet end 12 and an outlet end 14 thereof.
  • the body 10 has a sleeve 16 which receives and is fixed to an end portion of a supply tube 18.
  • the sleeve 16 is formed with an inner diameter corresponding to the diameter of the supply tube 18, such that the sleeve 16 can accommodate the end of the supply tube 18 within the inlet end 12 of the body 10 by way of a friction fit.
  • the sleeve 16 has a region of reduced internal diameter which forms an annular rim 20, against a face of which the end of the inlet tube 18 is abutted.
  • the external surface of the portion of the inlet tube 18 accommodated within the sleeve 16 is adhered to the internal surface of the sleeve 16 using a suitable adhesive to provide a secure fluid connection between the tube 18 and the fluid flow passage of the safety valve.
  • the opposite end of the supply tube 18 is connected to a gas supply such as for example that of an oxygen-enriched air supply for delivering oxygen to a patient.
  • the annular.rim 20 also provides an abutment face for a coiled spring 22 which extends in the direction of the longitudinal axis of the body 10.
  • valve head 26 which is mounted within the fluid flow passage 1 1 of the valve body 10.
  • the valve head 26 is a ball formed from a sealing material such as a polymeric material, rubber or other suitable material which will form a gas-tight seal under the pressure exerted by the spring 22.
  • a region of reduced internal diameter of the body 10 provides an annular sealing shoulder 31 which is shaped to correspond with the head 26 such that upon release of the spring 22, as further described below, the head 26 is urged into contact with the annular sealing shoulder 31 to form a seal therebetween.
  • the outlet end 14, of the body 10 receives and fluidly connects to a delivery tube 32, which delivers fluid from the safety valve to, for example, an oxygen mask or nasal cannula.
  • a delivery tube 32 which delivers fluid from the safety valve to, for example, an oxygen mask or nasal cannula.
  • the fluid flow path 1 1 is formed having an inner diameter corresponding to the external diameter of the delivery tube 32, such that the delivery tube 32 can be accommodated therein having a friction fit therewith.
  • the end portion of the delivery tube 32 is inserted into the fluid flow path 1 1 , at the outlet end 14, and abuts the valve head 26 against the bias of the spring 22 such that the valve head 26 is in a valve-open position.
  • the end of the delivery tube abutting the valve head 26 has apertures 33, which provide for fluid communication between the delivery tube 32 and the fluid flow path 1 1 , around the valve head 26. With the valve head 26 in this valve-open position and under bias of the spring 22, the outer surface of the delivery tube 32 is adhered to the inner surface of the fluid flow passage 1 1.
  • the delivery tube 32 is formed from a material which is susceptible to high temperatures, such as those experienced due to fire, flashback and/or ignition of a gas. The material must also have sufficient strength such that in use the delivery tube retains its structural strength against the force of the spring 22 acting thereon. Suitable materials for the delivery tube are thermoplastics, such as, for example, Polyvinylchloride (PVC).
  • PVC Polyvinylchloride
  • the safety valve is fitted between the outlet of a gas supply and a nasal cannula or mask, such as those commonly used in the home for those requiring oxygen to assist their breathing.
  • the gas supply can be in the form of an oxygen cylinder which provides oxygen for enrichment of normal oxygen intake by admixture with ambient air, or can be in the form of a source of oxygen-enriched air, both forms being delivered to the patient under pressure and regulated using suitable control means.
  • the safety valve according to the present invention, is fitted to ensure that the supply of oxygen is rapidly stopped in the event of oxygen, or oxygen-enriched air, igniting.
  • ⁇ second embodiment of the present invention comprises ⁇ safety valve 109 having an elongate hollow body 1 10, defining a fluid flow passage 1 1 1 between an inlet end 1 12 and an outlet end 1 14 thereof.
  • the body 1 10 has a sleeve 1 16 which receives and is fixed to an end portion of a supply tube 1 18.
  • the sleeve 1 16 is formed with an inner diameter corresponding to the diameter of the supply tube 1 18, such that the sleeve 1 16 can accommodate the end of the supply tube 1 18 within the inlet end 1 12 of the body 1 10 by way of a friction fit.
  • the sleeve 1 16 has a region of reduced internal diameter which forms an annular rim 120, against a face of which the end of the inlet tube 1 18 is abutted.
  • the external surface of the portion of the inlet tube 1 18 accommodated within the sleeve 1 16 is adhered to the internal surface of the sleeve 1 16 using a suitable adhesive to provide a secure fluid connection between the tube 1 18 and the fluid flow passage of the safety valve.
  • the opposite end of the supply tube 1 18 is connected to a gas supply such as for example an oxygen-enriched air supply for delivering oxygen to a patient.
  • a gas supply such as for example an oxygen-enriched air supply for delivering oxygen to a patient.
  • the annular rim 120 also provides an abutment face for a coiled spring 122 which extends in the direction of the longitudinal axis of the body 1 10.
  • valve member 124 which is mounted within the fluid flow passage 1 1 1 of the valve body 1 10.
  • the valve member 124 has a head 126 and an elongate link member 128 which extends, from the head 126, towards the outlet end 1 14, in the direction of the longitudinal axis of the body, and terminates in a foot 130.
  • the link member 128 is formed into a cylinder 133 and a link plate 135.
  • the cylinder has an aperture 129 extending therethrough, along its longitudinal axis.
  • the link pate 135 is a planar member which provides a link between the valve head 126 and the cylinder 133 such that the fluid flow path is maintained between the fluid flow passage around the valve head and into the aperture 129, of the cylinder 133.
  • the cylinder 133 is slidable within the fluid flow passage such that upon activation of the safety valve it allows the valve head to rapidly close, as described below.
  • the head 126 is a ball formed from a sealing material such as a polymeric material, rubber or other suitable material which will form a gas-tight seal under the pressure exerted by the spring 122.
  • the aforementioned opposite end of the spring 122 bears against the head 126.
  • a region of reduced internal diameter of the body 1 10 provides an annular sealing shoulder 131 , which is shaped to correspond with the head 126 such that upon release of the spring 122, as further described below, the head 126 is urged into contact with the annular sealing shoulder 131 to form a seal therebetween.
  • the outlet end 1 14, of the body 1 10, receives and fluidly connects to a delivery tube 132, which delivers fluid from the safety valve to, for example, an oxygen mask or nasal cannula.
  • the fluid flow path 1 1 1 is formed having an inner diameter corresponding to the external diameter of the delivery tube 132, such that the delivery tube 132 can be accommodated therein having a friction fit therewith.
  • the end portion of the delivery tube 132 is inserted into the fluid flow path 1 1 1 and abuts the foot 130 against the resilience of the spring 122.
  • a region of reduced internal diameter of the fluid flow path of the body 1 10 provides an abutment stop 134 against which the foot 130 is abutted.
  • abutment of the foot 130 against the stop 134 ensures a flow path exists between the head 126 and the annular sealing shoulder 131.
  • the delivery tube 132 is formed of a material which is susceptible to high temperatures such as those experienced due to fire, flashback and/or ignition of a gas. The material must also have sufficient strength such that in use the delivery tube retains its structural strength against the force of the spring 122 acting thereon by way of the foot 130. Suitable materials for the tube 132 are thermoplastics such as, for example, Polyvinylchloride (PVC).
  • PVC Polyvinylchloride
  • a valve unit according to the present invention is fitted between the outlet of a gas supply, such as that commonly used in the home for those requiring oxygen to assist a patient's breathing, and a nasal cannula or mask.
  • the gas supply can be in the form of an oxygen cylinder which provides oxygen for enrichment of normal oxygen intake by admixture with ambient air, or can be in the form of a source of oxygen-enriched air, both being under pressure, and the pressure of the supply to the patient being regulated by suitable control means.
  • the valve unit according to the invention will be fitted accordingly to ensure that in the event of the oxygen or oxygen-enriched air igniting, this supply can be cut off quickly.
  • the outlet tube 132 softens in the event of increased temperature to an extent such that it weakens sufficiently no longer to resist the force of the spring 122, the spring will overcome its resistance, thereby moving the valve member to urge the head 126 against the annular sealing shoulder 131 , closing the valve unit and preventing the flow of, in this case, oxygen.
  • a third embodiment of the present invention comprises a safety valve 209 having an elongate hollow body 210, defining a fluid flow passage 21 1, which has an inlet end 212 and an outlet end 214.
  • the hollow body 210 is formed in two parts, 210a and 210b, to facilitate assembly of internal parts of the valve unit.
  • the two parts 210a and 210b are connected together over an O-ring seal 213.
  • the body 210 is formed into a nozzle 215 to facilitate connection with a supply hose (not shown) from a gas supply such as for example that of an oxygen enriched air supply for delivering oxygen to a patient.
  • a supply hose such as for example that of an oxygen enriched air supply for delivering oxygen to a patient.
  • the inlet end 212 is screw threaded to facilitate connection with a connector to an outlet from a gas supply such as for example that of an oxygen enriched air supply for delivering oxygen to a patient.
  • the screw thread is formed such that it will engage a complementary thread on the oxygen supply unit (typically a cylinder) and will seal therewith, with, if required, the provision of an additional seal such as an O-ring.
  • the inlet end 212 there is a region of reduced internal diameter of the body 210, which defines an inwardly facing annular stop 217 from which a coiled spring 222 extends in the direction of the longitudinal axis of the body 210.
  • valve member 224 which is mounted within the fluid flow passage 21 1 of the valve body 210.
  • the valve member 224 comprises a head 226 integrally formed with an elongate link member 228.
  • the link member 228 is a generally flat member which extends through the fluid flow passage 21 1, body 210, in the direction of the longitudinal axis thereof, towards the outlet end 214, and terminates as a foot 230.
  • the valve member 224 is planar along its length while the head portion 226 is bulbous, being formed with a conical end portion 227 and a tapering neck portion 229, between which the head portion is formed with a shoulder 233 and an annular recess 235.
  • a region of reduced internal diameter of the fluid flow passage 21 1 of the body 210 provides an annular sealing shoulder 231 which is shaped to correspond with the head 226 such that upon release of the spring 222, as further described below, the head 226 is urged into contact with the annular sealing shoulder 231 to provide a seal between the annular sealing shoulder 231 and the sealing O-ring 236.
  • the outlet end 214, of the body 210 receives and fluidly connects to a delivery tube 232, which delivers fluid from the safety valve to, for example, an oxygen mask or nasal cannula.
  • the fluid flow path 21 1 is formed having an inner diameter corresponding to the external diameter of the delivery tube 232, such that the delivery tube 232 can be accommodated therein having a friction fit therewith.
  • the end portion of the delivery tube 232 is inserted into the fluid flow passage 21 1 and abuts the foot 230 against the biasing force of the spring 222.
  • a region of reduced internal diameter of the hollow body 210 provides an abutment stop 234 against which the end of the delivery tube 232 is abutted.
  • abutment of the delivery tube 232 against the stop 234 ensures a flow path exists between the head 226 and the annular sealing shoulder 231.
  • the flow path from the valve head to the outlet end is defined between the surface of the link member 228 and the wall of the fluid flow passage 21 1.
  • the delivery tube 232 is formed of ⁇ material which is susceptible to high temperatures such as those that may be experienced due to fire, flashback and/or ignition of a gas. The material must also have sufficient strength such that in use the delivery tube retains its structural strength against the force of the spring 222 acting thereon by way of the foot 230. Suitable materials are thermoplastics such as, for example, Polyvinylchloride (PVC).
  • a valve unit is fitted between the outlet of a gas supply, such as that commonly used in the home for those requiring oxygen to assist a patient's breathing, and a nasal cannula or mask.
  • the gas supply can be in the form of an oxygen cylinder which provides oxygen for enrichment of normal oxygen intake by admixture with ambient air, or can be in the form of a source of oxygen-enriched air, both being under pressure, and the pressure of the supply to the patient being regulated by suitable control means.
  • the valve unit according to the invention is fitted to ensure that in the event of the oxygen or oxygen-enriched air igniting, the supply can be cut off quickly.
  • the spring will overcome its resistance, thereby moving the valve member to urge the head 226 against the annular sealing shoulder 231 , closing the valve unit and providing a seal between the annular sealing shoulder 231 and the sealing O-ring 236, preventing the flow of, in this case, oxygen.
  • a fourth embodiment of the present invention comprises a safety valve 309 having a different delivery tube connection than the previously described embodiments.
  • the safety valve 309 has an outlet end 314 formed into a spigot 338.
  • the valve member 324 has a valve head 324 which has a spherically shaped surface to correspond with an annular sealing shoulder 331 formed in the wall of the fluid flow passage 31 1.
  • the elongate link member 328 is a planar member such that the fluid flow path is defined between the link member 328 and the wall of the fluid flow passage 31 1.
  • the link member 328 extends from the valve head 326 to beyond the outlet end 314, of the spigot 338, such that foot 330 is disposed external of the fluid flow passage 31 1.
  • the foot 330 has four lateral protrusions which extend radially outwards from the longitudinal axis of the valve member 324. Each projection 340 extends radially outwards to a diameter greater than the external diameter of the spigot 338.
  • a delivery tube 332 is fitted over the spigot 338 and the lateral projections 340, against the bias of a spring 322, such that the valve head 326 is held in a valve-open position.
  • the delivery tube 332 With the valve head 326 in this open-v ⁇ lve position the delivery tube 332 forms ⁇ friction fit with the outer surface of the spigot 338 and lateral protrusions 340.
  • the delivery tube 332 is additionally adhered to the outer surface of the spigot 338 to provide resistance to the force of the spring 322 and maintain the valve head 326 in a valve-open position.
  • the material from which the delivery tube 332 is formed softens to an extent such that it is no longer able to hold the force of the spring 322. Accordingly, the spring overcomes the resistance of the delivery tube 332 thereby urging the valve head 326 against the annular sealing shoulder 331 , closing the valve unit and preventing flow of, in this case, oxygen.
  • a fifth embodiment of the present invention comprises breathing assistance apparatus in the form of a nasal cannula assembly 400 having first and second oxygen supply tubes, 432a and 432b, which supply oxygen to a nasal piece 438 having a pair of nasal prongs 440.
  • First and second safety valves, 410a and 410b are connected in line to the first and second oxygen supply tubes, 432a and 432b, respectively.
  • a ring 442 formed from a plastics material, is disposed around the tubes 432a and 432b, and is slideable along a portion of their length, to keep the tubes tidy and to alter the size of the loop formed by the tubes adjacent the nasal piece 438, for patient comfort.
  • the first and second safety valve units, 410a and 410b are positioned in the oxygen supply line such that any ignition of the oxygen or oxygen-enriched air in the vicinity of the nasal piece 438 will raise the temperature of the tubes, 432a and 432b, sufficient to activate the valve member in the safety valve units, 410a and 410b, thereby cutting off the supply of oxygen to the ignited environment.
  • a sixth embodiment of the present invention comprises breathing assistance apparatus in the form of a breathing mask assembly 500 having an oxygen supply tube 532, for supplying oxygen to a mask 538, and a mask strap 540, for retaining the mask on the face of a patient
  • a safety valve unit, 510 is connected in line with an oxygen supply tube 532.
  • the safety valve unit 510 is positioned in the oxygen supply line such that any ignition of the oxygen or oxygen-enriched air in the vicinity of the mask 538 will at least raise the temperature of the tube 532 sufficient to activate the valve member in the safety valve unit 510 thereby cutting off the supply of oxygen to the ignited environment.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Pulmonology (AREA)
  • Emergency Medicine (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hematology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Biomedical Technology (AREA)
  • Anesthesiology (AREA)
  • Otolaryngology (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)

Abstract

La présente invention concerne une unité de soupape de sureté (9) assurant la fermeture d'un chemin d'écoulement d'un fluide combustible provenant d'une source lors de la détection d'un incendie dans le tube de distribution (32) depuis la soupape vers un utilisateur. La soupape de sureté (9) comporte un corps de soupape (10) et une tête de soupape (26). La tête de soupape (26) est sollicitée élastiquement vers une position de fermeture de soupape. Le corps de soupape (10) comprend un moyen pour recevoir (14) un tube de distribution de fluide réalisé en un matériau apte à être ramolli par la chaleur qui, lorsqu'il est ajusté, maintient la tête de soupape (26), contre la sollicitation (22), dans une position ouverte de soupape, de sorte que le tube de distribution de fluide agit comme un élément fusible de la soupape (9).
PCT/GB2007/004699 2006-12-08 2007-12-07 Unité de soupape de sureté Ceased WO2008068508A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0624524A GB0624524D0 (en) 2006-12-08 2006-12-08 Safety Valve Unit
GB0624524.5 2006-12-08

Publications (1)

Publication Number Publication Date
WO2008068508A1 true WO2008068508A1 (fr) 2008-06-12

Family

ID=37711774

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2007/004699 Ceased WO2008068508A1 (fr) 2006-12-08 2007-12-07 Unité de soupape de sureté

Country Status (2)

Country Link
GB (1) GB0624524D0 (fr)
WO (1) WO2008068508A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012024400A (ja) * 2010-07-26 2012-02-09 Daikin Industries Ltd 酸素供給遮断器具
CN103343796A (zh) * 2013-06-28 2013-10-09 上海斐讯数据通信技术有限公司 一种用于便携式设备的动力系统及实现方法
EP2682149A3 (fr) * 2012-07-02 2014-03-12 LUCHS Medizin GmbH & Co. KG Appareil à oxygène ainsi que flexible d'air de respiration et module anti-incendie correspondant
WO2017144864A1 (fr) * 2016-02-26 2017-08-31 Bpr Medical Limited Distributeur de canule nasale
WO2019221816A1 (fr) * 2018-05-14 2019-11-21 Praxair Technology, Inc. Dispositif d'arrêt d'écoulement de gaz
WO2021009511A1 (fr) * 2019-07-16 2021-01-21 Bpr Medical Limited Dispositif coupe-feu
US20220184285A1 (en) * 2020-12-16 2022-06-16 Fresenius Medical Care Holdings, Inc. Thermal protection system for a dialysate container

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1070359A (en) * 1965-04-22 1967-06-01 Gas Council Improvements relating to couplings for pipes
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WO2017144864A1 (fr) * 2016-02-26 2017-08-31 Bpr Medical Limited Distributeur de canule nasale
WO2019221816A1 (fr) * 2018-05-14 2019-11-21 Praxair Technology, Inc. Dispositif d'arrêt d'écoulement de gaz
US11344695B2 (en) 2018-05-14 2022-05-31 Praxair Technology, Inc. Gas flow arrestor
WO2021009511A1 (fr) * 2019-07-16 2021-01-21 Bpr Medical Limited Dispositif coupe-feu
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GB2585841B (en) * 2019-07-16 2023-06-21 Bpr Medical Ltd Firebreak device
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