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WO2005072795A2 - Dispositif de distribution de medicament, jetable - Google Patents

Dispositif de distribution de medicament, jetable Download PDF

Info

Publication number
WO2005072795A2
WO2005072795A2 PCT/DK2005/000061 DK2005000061W WO2005072795A2 WO 2005072795 A2 WO2005072795 A2 WO 2005072795A2 DK 2005000061 W DK2005000061 W DK 2005000061W WO 2005072795 A2 WO2005072795 A2 WO 2005072795A2
Authority
WO
WIPO (PCT)
Prior art keywords
housing
piston
dispensing device
needle
rotational direction
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/DK2005/000061
Other languages
English (en)
Other versions
WO2005072795A3 (fr
Inventor
Morten MERNØE
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.)
M2 Medical AS
Original Assignee
M2 Medical AS
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 M2 Medical AS filed Critical M2 Medical AS
Publication of WO2005072795A2 publication Critical patent/WO2005072795A2/fr
Publication of WO2005072795A3 publication Critical patent/WO2005072795A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/142—Pressure infusion, e.g. using pumps
    • A61M5/145—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons
    • A61M5/1452—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons
    • A61M5/1454—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons spring-actuated, e.g. by a clockwork
    • 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
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/142—Pressure infusion, e.g. using pumps
    • A61M5/14244—Pressure infusion, e.g. using pumps adapted to be carried by the patient, e.g. portable on the body
    • A61M5/14248—Pressure infusion, e.g. using pumps adapted to be carried by the patient, e.g. portable on the body of the skin patch type
    • 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
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/142—Pressure infusion, e.g. using pumps
    • A61M5/14244—Pressure infusion, e.g. using pumps adapted to be carried by the patient, e.g. portable on the body
    • A61M5/14248—Pressure infusion, e.g. using pumps adapted to be carried by the patient, e.g. portable on the body of the skin patch type
    • A61M2005/14252—Pressure infusion, e.g. using pumps adapted to be carried by the patient, e.g. portable on the body of the skin patch type with needle insertion means
    • 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
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/142—Pressure infusion, e.g. using pumps
    • A61M5/14244—Pressure infusion, e.g. using pumps adapted to be carried by the patient, e.g. portable on the body
    • A61M5/14248—Pressure infusion, e.g. using pumps adapted to be carried by the patient, e.g. portable on the body of the skin patch type
    • A61M2005/1426—Pressure infusion, e.g. using pumps adapted to be carried by the patient, e.g. portable on the body of the skin patch type with means for preventing access to the needle after use
    • 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
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/142—Pressure infusion, e.g. using pumps
    • A61M5/145—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons
    • A61M5/1452—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons
    • A61M2005/14533—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons cam actuated
    • 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
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M2005/3114—Filling or refilling
    • 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
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod
    • A61M2005/31518—Piston or piston-rod constructions, e.g. connection of piston with piston-rod designed to reduce the overall size of an injection device, e.g. using flexible or pivotally connected chain-like rod members
    • 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
    • A61M2205/02—General characteristics of the apparatus characterised by a particular materials
    • A61M2205/0266—Shape memory materials
    • 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
    • A61M2209/00—Ancillary equipment
    • A61M2209/04—Tools for specific apparatus
    • A61M2209/045—Tools for specific apparatus for filling, e.g. for filling reservoirs
    • 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
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/142—Pressure infusion, e.g. using pumps
    • A61M5/145—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons
    • A61M5/1452—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons
    • A61M5/14566—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons with a replaceable reservoir for receiving a piston rod of the pump

Definitions

  • Such a device is obtained according to the invention by providing the device with a cylindrical medicine container, preferably a carpule, incorporating a piston and arranged in said housing, the container having an open distal end and a proximal end closed by a closure body made of a material, preferably silicone, that can be perforated by a needle, a first hollow needle extending from a first end in the interior of said medicine container through said plug to a second end, a catheter in fluid communication with said second end and for injection of said medicine into said user, said catheter being associated with said housing, a piston rod with a longitudinally extending first screw thread on the outer surface thereof and arranged for displacing said piston from said distal end to said proximal end, a toothed or ratchet wheel having a central aperture for receiving said piston rod and provided with a second screw thread meshing with said first screw thread such that rotation of said ratchet wheel in a first rotational direction will displace said piston towards said proximal end, a pivotable body,
  • said actuator comprises a shape memory alloy wire and the actuator preferably comprises a shape memory thread or wire fixedly attached at one end to an electrically conducive fastening means and fixedly attached at the opposite end to said pivotable body at a second point spaced from said axis such that contraction of said shape memory wire pivots said pivotable body in said third rotational direction.
  • the spring means comprises a rod spring extending generally parallel with said cylindrical medicine container and having one end fixated against lateral movement and the opposite end abuts, attached to or integral with said first point on said pivotable body.
  • the second point is located such relative to said axis and said shape memory alloy wire force that the moment arm relative to said axis of the force exerted on said pivotable body by the contraction of said shape memory wire increases as said pivotable body rotates in said third rotational direction and/or the first point is located such relative to said axis and said spring force that the moment arm relative to said axis of said spring force increases as said pivotable body rotates in said second rotational direction.
  • controlling means for controlling the operation of said actuator according to a programme are arranged in said housing.
  • the device comprises a dispensing assembly interconnected with said housing, said dispensing assembly comprising:
  • a second needle for perforating the skin of said user arranged displaceable along a linear trajectory generally orthogonal to the longitu inal extent of said first hollow needle
  • a plug of a perforatable material preferably silicone, located on said trajectory and traversed by said first hollow needle, - a compartment arranged adjacent said plug and receiving said second end of said hollow needle, and
  • a guide body having an interior guide passage aligned with and in direct fluid communication with both the lumen of said catheter and said compartment and arranged such that said interior passage and said lumen is on said trajectory.
  • - attachment means preferably adhesive attachment means, for attaching said housing to the skin of a user of said device
  • a cylindrical medicine container preferably a carpule, incorporating a piston and arranged in said housing, the container having an open distal end and a proximal end closed by a closure body made of a material, preferably silicone, that can be perforated by a needle,
  • first displacement means connected to said piston and adapted for displacing said piston from said proximal end towards said distal end
  • - second displacement means comprising a battery powered actuator for displacing said piston from said distal end towards said proximal end
  • the same standard dispensing device may be used for dispensing various types of medicine and that a device without medicine inside and having a longer shelf life than a device incorporating medicine may be filled from a container with a shorter shelf life.
  • the first displacement means comprise a rod attached at one end to said piston and extending through the lumen of said cylindrical container, out through said open distal end and through an aperture is said housing to the other end located outside the housing and provided with gripping means, for instance a handle and the rod is preferably releasably connected to said piston.
  • the rod comprises two releasably interconnected rods, one of which is fixedly connected to said piston, the other of which being provided with said gripping means.
  • the rod provided with gripping means is provided with a longitudinally extending venting channel for venting air displaced by displacement of said piston from said proximal end to said distal end and a venting aperture is provided in said housing for venting air displaced by said displacement of said piston from said proximal end to said distal end, flow of water into said housing through said venting aperture being obstructed by flow obstructing means such as a one-way or non-return valve or an air permeable, liquid impermeable, hydrophobic membrane.
  • flow obstructing means such as a one-way or non-return valve or an air permeable, liquid impermeable, hydrophobic membrane.
  • the present invention relates to a combination of - a fillable, disposable, wearable, self-contained medicine dispensing device comprising:
  • - displacement means comprising a battery powered actuator for displacing said piston from said distal end towards said proximal end
  • a filling adapter comprising: - a rectilinear channel extending through said adapter for receiving and guiding a needle of a hypodermic syringe, and - second engagement means for releasably engaging said first engagement means of said housing with said adapter located in such an engaged position relative to said housing that said needle when extending through and guided by said channel will perforate said closure body of said carpule for allowing injection of medicine from said syringe into said carpule.
  • said adapter is provided with locking means for locking said needle inside said channel.
  • - said adapter is provided with a fixedly arranged hollow venting needle extending parallel with said channel, and - said housing is provided with a venting element made of a material that can be perforated by said venting needle,
  • said venting element is constituted by an O-ring arranged around said carpule at said proximal end thereof.
  • the present invention relates to a medicine filling adapter comprising the features of the filling adapter of the combination according to the invention.
  • the present invention relates to a method of filling medicine into a fillable, disposable, wearable, self-contained medicine dispensing device comprising the following steps:
  • - providing a fillable, disposable, wearable, self-contained medicine dispensing device comprising: - a housing, - attachment means, preferably adhesive attachment means, for attaching said housing to the skin of a user of said device, - a cylindrical medicine container, preferably a carpule, incorporating a piston and arranged in said housing, the container having an open distal end and a proximal end closed by a closure body made of a material, preferably silicone, that can be perforated by a needle, and - displacement means comprising a battery powered actuator for displacing said piston from said distal end towards said proximal end, - providing a hypodermic syringe containing said medicine,
  • Fig. 1 is a schematic perspective view of a device according to the invention
  • Figs. 2a-2e are enlarged scale views of different aspects of the flexible piston according to the invention shown in Fig. 2
  • Fig. 3 is a schematic enlarged scale exploded view of the shape memory actuator according to the invention shown in Fig. 2
  • Fig. 4 is a view of the components in Figs. 2 and 3 in assembled condition
  • Figs. 5a-5d are enlarged scale views of the actuator of Fig. 3 in assembled condition
  • Figs. 5d-5f are diagrammatical elevational views of the pivotable plate in three different situations illustrating the action of the forces on the plate,
  • Fig. 6 is a schematic exploded view of the dispensing mechanism according to the invention.
  • Figs. 6a-6k are enlarged scale views of details of the fluid flow path of the medicine,
  • Figs. 7a-7g are views illustrating the application of the dispenser of Fig. 1 to the skin of a user of the device
  • Fig. 8 is a schematic exploded view of a fillable medicine dispenser according to the invention.
  • Figs. 9-13 are schematic partially cut away views of the fillable dispenser of Fig. 8 illustrating the operation thereof
  • Fig. 14 is an enlarged scale view of the releasable connection of the pulling rod in Fig. 9,
  • Figs. 15-17 are schematic views illustrating the method according to the invention of filling medicine into a dispensing device according to the invention.
  • Fig. 18 is an enlarged scale view of an alternative actuator according to the invention.
  • Figs. 19-23 are schematic views of a combination according to the invention of a filling adapter and a dispensing device according to the invention.
  • Fig. 14 is a schematic view of further alternative actuator according to the invention.
  • Figs. 25-27 are schematic views illustrating the operation of a yet further actuator according to the invention.
  • a fully disposable medicine dispensing device comprises a preferably hermetically sealed housing 12 provided with a push button 14 for activating and deactivating the device as well as activating a so-called bolus operation as explained in the following.
  • the stylus 16 includes a handle 18 formed with a number of ribs 20 for improved grip.
  • the function of the stylus 16 is illustrated in Figs. 6-7 and is described in the following.
  • the housing 12 comprises a top part 34 and a bottom part 36. At the bottom part 36 of the housing 12, a foil 22 is attached.
  • An adhesive pad 26 is provided including a skin friendly adhesive material for fixating the device 10 relative to the skin surface part of a patient or user.
  • the adhesive material may for instance be chosen within the well known field of ostomy pouches, see for instance European patent application No. 0413 250 and European patent application No. 0 092 999. Reference is made to the mentioned European patent applications and the patent applications are hereby incorporated by reference.
  • a release film 24 is adhered for protecting the adhesive surface of the pad 26 such that the adhesive properties are intact when the pad 26 is to be adhered to the skin of a user of the dispensing device 10.
  • the user removes the protective slip release film 24, thereby exposing the adhesive pad, which is then adhered to the abdominal skin of the user.
  • the top part 34 of the housing 12 includes a window 32 for the user to inspect the level of medication left in a container 52 or carpule located inside the housing 12.
  • Figs. 2 and 3 are exploded views of the components of the medicine dispensing device according to the invention. The components shown in exploded view in Figs. 2 and 3 are shown in Fig. 4 assembled inside the bottom part 36 of the housing.
  • the push button 14 extends through an opening or aperture 38 in the top part 34 of the housing 12.
  • the window 32 in the top part 34 is illustrated as being oblong, but may have any geometrical configuration such as elliptical, circular, square, alternatively a plurality of windows may be formed in the top part 34, alternatively the window may be formed in bottom part 36, further alternatively either the top part 34 or the bottom part 36 may be made from a transparent plastic material.
  • the housing 12 contains a glass or plastic container or carpule 52 for storing and dispensing medicine such as insulin.
  • the container or carpule 52 is of a well-known type having a perforatable dispensing projection 54 for receiving a catheter.
  • the projection 54 has a perforatable portion made of an elastomer, for instance silicone, and is hermetically mounted in the bottom part 36 by means of an O-ring 56 of silicone.
  • a toothed wheel or ratchet wheel 40 is mounted inside the housing 12 for driving a piston or plunger 50 into one end of the carpule 52 for dispensing the contents of the carpule 52 through the dispensing projection 54.
  • the toothed wheel 40 includes an aperture 42 for receiving a threaded bar or flexible piston rod 44.
  • the piston 50 is attached to one end of the flexible piston rod 44 constituted by a series of elements 154 interconnected by hinge means 156 (see Figs. 2b-2d) and arranged for movement between two guide walls.
  • the flexible piston rod 44 is made of plastic material to keep the weight down and to allow cheap and simple manufacture by injection moulding. Axial displacement of the piston 50 will press medicine, for instance insulin, out of the carpule 52 into the catheter assembly described more in detail in the following.
  • the elements 154 are integral with each other by means of hinges 156 which allow adjacent elements to pivot relative to one another from the position abutting one another shown in Fig.
  • the material of the flexible piston rod 44 is any suitable mouldable material, but it is preferred that the material is a plastic material such as Nylon, PA or POM because of possibility of precise manufacture and low friction as well as low cost, low weight and re-cycling issues.
  • Each element 154 is provided with exterior threads 158 on two opposed portions 162 and 164 of the elements having a circular cylindrical configuration for allowing an internal thread of the ratchet wheel 40 (Fig.2) to mesh therewith such that rotation of the ratchet wheel 40 will displace the piston rod 44 into the carpule 52.
  • At least the side of the elements 154 coinciding with the hinges 156 is flat to allow practical moulding of the hinge. The flat side or flat opposed sides also allows preventing rotation of the piston rod 44 around its axis when being axially displaced by the internal thread of the ratchet wheel 40.
  • a conveying pawl 74 of a plate 78 pivotably mounted on a pin 70a engages the teeth of the toothed wheel 40 such that the toothed wheel 40 is rotated when the plate 78 pivots counter clock-wise, the internal threads in aperture 42 thereby being rotated for displacing the flexible rod and the plunger 50 further into the carpule 52.
  • the conveying pawl 74 is operated by an SMA actuator, described more in detail in the following.
  • the conveying pawl 74 is operatively connected to an elongated rod spring 66.
  • the spring 66 is held in place by a number of pins 70 at one end thereof.
  • a battery 60 is provided and is fixated to a printed circuit board 58 by a number of holding pins 64. Electrical conductive pins are provided to the positive and negative poles of the battery 60, respectively, for the supply of electrical power to the elements attached to the printed circuit board 58.
  • a beeper 76 is also mounted in the housing 12.
  • the beeper 76 may be used for communicating status information or alarms to the user.
  • the beeper 76 is electrically fed by the battery 60.
  • a pawl 80 for engaging the spring 66 is formed in the plate 78.
  • a projection 82 of the spring is formed so as to improve the transference of forced from the spring 66 to the pawl 74.
  • a stop pawl 84 of a plate 72 is provided for engaging the ratchet wheel engaging and stopping the ratchet wheel 40 against rotation clock-wise. The plate 72 is fixedly attached to the PCB 58 by means of pins 70b.
  • Fig. 4 is a view of the device wherein the components have been assembled inside the housing 12.
  • Fig. 5a illustrates the initial position of the plate 78 where a projection 78a thereof abuts a stop pin 85b.
  • the plate 78 is engaged by the rod spring 66 exerting an upwardly orientated force on the plate 78 forcing the projection 78a against the stop pin 85b.
  • No electrical current is applied to the NITI thread 86 and the thread is therefore in its expanded or uncontracted state.
  • Fig. 5c illustrates an intermediate situation after turning off electrical current to the thread 86, thereby causing the thread 86 to expand and consequently release its pull on the plate 78 whereby the force exerted by the spring 66 forces the plate 78 to pivot counter clock-wise to the configuration illustrated in Fig. 5a.
  • the toothed wheel 40 is thereby rotated counter clock-wise by the pawl 80 and consequently the piston or plunger 50 is displaced further into the carpule 52.
  • the stop pawl 84 engages the next tooth on the toothed wheel 40 and prevents the pressure in the carpule 52 from pressing the piston 50 backwards and thereby pivoting the wheel 40 clock-wise.
  • the contraction of the thread 66 is rather rapid when the transformation temperature of the alloy is attained.
  • the rate of injection of the medicine into the user is determined by the pressure in the medicine resulting from the displacement of the piston 50. The quicker the rate of injection must be to correspond to the contraction rate of the thread, the higher the pressure is and the higher the tension in the thread is. This may either result in snapping or severely damaging the thread and/or rupturing a component in the dispensing assembly described more in detail in the following.
  • the thread 86 by letting the rod spring 66 transfer the displacement force to the plate 78 and thereby to the piston 50, the thread 86 must only flex the spring and rotate the plate 78 alone which can take place very quickly and with a predetermined force having to be exerted by the thread 66, a force which the thread can be dimensioned to exert with no risk of damage.
  • the pumping force exerted by the spring 66 on the plate 78 and thereby the piston 50 is relatively constant and can be designed to achieve the optimal dispensing pressure inside the carpule 52.
  • the rod spring 66 may be replaced by any suitable resilient body such as a rubber or silicone pad, a tension or compression coil spring, a spiral spring and so on.
  • a particularly advantageous alternative embodiment of the spring 66 is to provide the plate 78 with a projecting rod either fixed to the plate or integral therewith and abutting a stop pin on the PCB 58 at its end remote from the plate 78.
  • FIGs. 5d-5f corresponding to Figs. 5a-5c, an optimal location of the forces Ft and Fs applied to the plate 78 by the thread 86 and the spring 66 relative to the rotational axis of the plate, the pin 70a, are illustrated.
  • the moment arm b1 of Fs in Fig. 5d where the spring 66 is the least flexed and therefore where Fs is smallest, is larger than the moment arm b2 in Fig. 5f, where the spring 66 is most flexed and therefore where Fs is largest.
  • the moment necessary to flex the spring can be substantially more constant, and the force applied by the plate 78 to the ratchet wheel 40 can be substantially more constant. Both effects are advantageous, one for the performance of the thread 86, the other for achieving a substantially constant dispensing pressure in the carpule 52.
  • the needle 88 As the needle 88 is inserted through the opening 90, the needle passes through a silicone plug 96, ensuring that when the needle 88 is not inserted, no contamination may pass through from the opening 90.
  • the needle 88 passes through the silicone plug 96 and continues into a funnel shaped guide 98 guiding the needle 88 into a catheter tube 100 into the top end of which tube the lower end of the guide 90 is inserted.
  • the catheter tube 100 is made from a soft and flexible material such as PTFE.
  • a catheter needle 102 provides passage of the medicine from the carpule 52 into the catheter tube 100.
  • An adhesive ring 104 fixates the bottom part 94 to the adhesive pad 26.
  • a plate 28 covers the part of the adhesive ring 104 that extends beyond the bottom part 94.
  • a release foil 22 is adhered to an adhesive pad 108.
  • the adhesive pad 108 serves the purpose of fixating the housing 12 relative to the adhesive pad 26.
  • the protection cap 30 is fixated to the slip release film 24 by an adhesive ring 110.
  • the protection cap 30 protects the protruding part of the catheter tube 100 and the sharp tip of the needle 88 when shipping or storing the device 10.
  • Fig. 6a is a top-view of the top part 92 when assembled with the bottom part 94, but without the stiletto 16.
  • Fig. 6b is a view along the line A-A of Fig. 6a.
  • the needle 88 has been inserted in the opening 90 through the plug 96 and extends through the guide 98.
  • the needle 88 further extends through the catheter tube 100.
  • Fig. 6.c is an enlarged view of the circle 91 of fig 6b.
  • the guide 98 a cavity 95 is formed. When the needle 88 is removed, the cavity 95 may receive medication from an aperture 97 formed in the sidewall of the guide 98 (see Fig. 6i). The medication may then flow from the guide 98 into the catheter 100 which, when located correctly, is placed beneath the skin of the patient wearing the device 10.
  • Fig. 6d shows the assembled top 92 and bottom 94 parts seen from the side from which the needle 102 extends.
  • Fig. 6e is a section along the line B-B of Fig. 6d.
  • Fig. 6f is an enlarged view of the central portion of Fig. 6e.
  • the medication flows from the carpule 52 through the needle 102.
  • the medication flows from the needle 102 into a compartment 99 formed between the plug 96, the inner sidewalls of the top 92 and bottom 94 parts and the guide 98 (see also Fig. 6i).
  • the needle 88 passes through the plug 96 in a direction substantially orthogonal to the direction of the catheter 102, but without intersecting the catheter 102.
  • FIG. 6g is a section along the line C-C of Fig. 6d while Fig. 6h is an enlarged view of the circle 99b of Fig. 6g.
  • the figure shows the compartment 99 wherein the medication is received from the needle 102.
  • the needle 88 is visible in the background.
  • Figs. 6i-6k further illustrate the pathway of the medicine through the needle 102 to the guide 98 into the catheter tube 100 shown by arrows in Fig. 6i.
  • Fig. 7a illustrates the device prior to the interconnection of the housing 12 with the dispensing assembly being inserted in a receiving part or sleeve formed by a top part 92 and a bottom part 94.
  • This assembly may be performed prior to delivering the device to the user or the process of assembling the two parts may be performed by the user/care-giver.
  • Fig 7b illustrates the device 10 assembled.
  • the slip release film 24 is removed, thereby exposing the adhesive pad 26.
  • the protection cap 30 is removed, thereby exposing the needle 88.
  • the needle 88 extends through the catheter tube 100.
  • the needle 88 perforates the skin of the patient when the device is placed on the skin surface, thereby the catheter tube 100 is guided beneath the skin of the patient.
  • Fig. 7d illustrates the device placed on the user's skin 112. After adhering the device to the abdominal skin 112 of the patient, the foil 22 may be removed (see Fig. 7e), thereby fastening or fixating the housing 12 to the adhesive pad 26. This operation may also be performed prior to application of the device to the skin.
  • Fig. 7f the user has lifted the handle 18 so that the needle 88 is retracted from the patient, leaving the catheter tube 100 inserted into the skin of, the patient.
  • This enables the device to deliver the medicine subcutaneously to the patient.
  • the entire stylus 16 and handle 18 may be separated from the housing 12 of the device 10 since the stylus 16 may hinder or limit the free movement of the patient.
  • the needle 88 is fully embedded in the stylus 16 so that no person or persons inadvertently can be pricked by the needle.
  • the tip of the needle 88 may be covered with a plug or stopper after retraction and separation from the device 10.
  • Fig. 8 is a view of an exploded device according to the present invention wherein the carpule 52 in the device supplied to the user is initially empty and may be filled by the user.
  • the device 10 includes many parts similar to those described in Fig. 2 and these parts will not be discussed further.
  • the embodiment illustrated in Fig. 8 includes a plunger 112 wherein the plunger head 114 has been fitted with a rod 116 extending backwardly.
  • the rod 116 has an engagement 118 to be engaged by a corresponding engagement part 120 of a second rod 122 including a handle 124 (see Fig. 14).
  • a modified top part 34' and bottom part 36' are used in this embodiment. The parts have been modified for receiving the rods 116 and 122 through an opening 36'a.
  • the carpule 52 When the user receives the device 10', the carpule 52 is empty and the plunger head 114 is located at the end near the protruding part 54 of the carpule 52.
  • the rod 122 extends from the opening 36'a in the housing 12 through an annular seal 126, such as a silicone ring arranged in the opening and surrounding the rod or bar 122 in a way such that the interior of the housing 12 can not be contaminated.
  • Fig. 9 illustrates the parts of Fig. 8 assembled in the bottom part 36 of the housing 12.
  • the figure illustrates the plunger head 114 in a position near the protruding part 54 of the carpule 52.
  • a bowl or cup shaped adapter 126 shaped to receive the projection 54 is provided with a double pointed needle 128 extending through the adapter 126 so as to establish fluid communication between the interior of the carpule and an external container containing the medication.
  • the carpule in all the embodiments described herein is coated with a non-toxic lubricant on the inside surface for facilitating the movement of the plunger or plungers.
  • Fig. 10 illustrates the empty carpule 52 having the adapter 126 mounted on the protruding part 54 with the needle 128 extending into the interior of the carpule.
  • the user pulls the handle 124 into the position illustrated in Fig. 11 hereby sucking the medicine from the container into the carpule.
  • the plunger 114 is brought into contact with the plunger 50' and provided that the external container with the medication has been connected correctly to the adapter 126, the carpule 52 is now filled with the medication.
  • the venting may take place by providing a not shown venting aperture in the housing.
  • a non-return valve may be arranged in the venting aperture to avoid water entering the housing when the user bathes.
  • the venting aperture may be covered by a hydro-phobic breathable membrane allowing air to exit but not water to enter.
  • Fig. 14 is an enlarged view of the engagement parts 118 and 120 which are constituted by a projection 120 received in a not shown corresponding recess 118.
  • the handle 124 and rod 116 ,122 are made from a non-toxic plastic material that may be readily disposed of.
  • the rod 122 may also be releasably connected directly to the plunger head 114 for instance by means of a screw thread or a bayonet engagement.
  • Figs. 15-17 illustrates a method of filling the carpule 52 with medication using a syringe 130.
  • the user is supplied with a housing 12' similar to that of Fig. 1 except that the carpule is empty and a plug or disc 132 is located at the end of the carpule, near the protruding part.
  • the user inserts a needle 129 of a syringe 130 into the protruding part 54 and depresses a plunger 134 of the syringe 130.
  • Fig. 16 illustrates the situation wherein the user has fully depressed the plunger 134 and the plug 132 has been moved to the opposite end of the carpule as the interior of the carpule is now filled with medication. The user then retracts the syringe 130 from the dispensing protection 54 and disposes of the syringe 130 in a safe manner.
  • FIG. 18 illustrates an alternative method of driving the toothed wheel 40 by means of a small electric step motor 134 driving a gear 136 engaging the toothed wheel 40.
  • Possible alternative embodiments of the driving mechanism driving the toothed wheel 40 or directly driving the threaded flexible piston rod 44 includes a coil spring exerting a pivoting force on the wheel 40.
  • a coil spring exerting a pivoting force on the wheel 40 is not recommendable because of the possibility of malfunction with resulting sudden release of the energy stored in the spring and the consequent release of the entire or remaining content of medicine resulting in an overdose of medication.
  • Figs. 19-23 illustrate a further alternative embodiment of an adapter 138 enabling the user to safely fill the carpule 52.
  • the adapter 138 receives a needle 140 of a syringe 142.
  • the syringe 142 includes a plunger 146.
  • the adapter 138 is provided with a not shown internal guide for the needle such that the needle is positioned precisely relative to the adapter.
  • the guide is provided with a one-way lock allowing the needle to pass in one direction but preventing the needle from being pulled back in the opposite direction so that the needle may not be retracted from the adapter 138.
  • the needle 140 does not extend beyond the adapter 138 so that the syringe 142 including the needle 140 and the adapter 138 may ultimately be safely disposed of.
  • a second venting needle 144 for venting air in the housing 12 during filling of the carpule is located in the adapter in such a position that when the adapter is connected to the housing 12 as shown in Fig. 21 , the venting needle perforates the sealing ring 56 and extends into the interior of the housing 12 thereby enabling release of excess pressure built up inside the housing 12 caused by the reduced volume when filling the carpule 52.
  • Ribs 138a provided on the adapter 138 fit snugly into corresponding not shown grooves in the housing 36 such that the angular position of the adapter 138 relative to the housing 12 is predetermined so that the perforation of the sealing ring 56 by the venting needle takes place at the predetermined location.
  • Figs. 20-23 illustrate the steps of connecting the adapter 138 to the housing 12 and subsequently, filling the carpule with the medication stored in the syringe 142.
  • the adapter 138 and the housing 12 may be dimensioned such that none of the needles140 and 144 protrude outside the adapter 138.
  • the syringe may be supplied to the user already connected to the adapter or the syringe may be integral with the adapter.
  • the adapter and/or syringe may be provided with unique engagement means corresponding to unique engagement means on the housing 12 that only allow such a unique combination of adapter and syringe to be coupled to the housing such that only authorized medicine may be filled into the carpule.
  • actuating means for displacing the piston rod 44 is the SMA actuator described above, other actuating means may be employed.
  • Fig. 24 illustrates the back surface of the printed circuit board 58, whereon a solenoid 148 is located connected to a wire or thread 186 that in turn extends through an aperture 150 in the board and is fastened to the plate 78 such that a tension force applied to the thread by the solenoid results in pivoting of the plate 78 and flexing of the rod spring 66.
  • a further alternative actuator for the toothed wheel 40 Comprises an actuator 149 that can rotate a pin 78a received in plate 78 to and fro so that the plate 78 is rotated to and fro between stops 85a and 85b as illustrated in Figs. 25-27.
  • the actuator 149 may comprise an SMA thread arranged to pivot the pin 78a against the action of a spring or it may comprise a pivoting solenoid.
  • a dispensing device or insulin pump according to the invention may function in several different manners depending on the design and programming of the various control elements of the circuit board: 1. Stand alone pump with constant flow:
  • the pump functions as a constant flow pump and may be designed for different flow rates, for instance 20 units/24 hours, 30 units/24 hours, etc.
  • a timing device is incorporated in the print board so that a standard programme controls the flow dispensed by the pump during recurring 24 hour periods.
  • the preprogrammed operating instructions may for example result in a lower dosage at night than during the day and an extra dosage at mealtimes.
  • the pump is not provided with a predetermined programme, but is provided with a programmable unit in the print board and can be programmed by the user or a doctor by means of a controller.
  • the programming must be able to take place through the packing material in which the dispensing device is supplied so that the user can transport the device in a sterilised packaging on vacations or the like without having to carry the controller along.
  • the controller is a dedicated unit that for instance via a USB plug can be connected to a PC or it can be provided with cellular telephone capability for transmission of data or other wireless connection capability.
  • the controller can thus be programmed by a doctor or a user and be used for programming of the functioning of all subsequently used disposable dispensing devices.
  • This pump functions in the same manner as programmable pump type 1 , but the controller is a palm pilot or a laptop PC. This gives the additional advantage that the user may input health information and glucose level measurement results directly into the controller or programming unit and thus communicate such information to the doctor who may use this information when deciding whether the programming function of the controller or the programming unit is to be altered for subsequently used disposable dispensing devices.
  • Programmable pump with audio input and output By providing the dispensing device with a microphone/loudspeaker and a suitable recording/play-back chip in the printed circuit, short messages may be recorded by the dispensing device, and the short messages may be emitted by the device upon suitable manipulation of recording button mounted on the housing.
  • the user may record verbally formulated information regarding glucose levels, meal composition, exercise, etc.
  • a timer may record the timing of each recorded message.
  • a doctor may then use these recorded messages together with information about number and timing of bolus dosages, pumping stops and the programme utilised for the dispensing of the insulin so as to evaluate the treatment and decide upon any changes in the programming and instructions to the patient which may be recorded by the doctor via a mobile telephone or the like such that messages are automatically delivered to the user at predetermined times.
  • Such a message could for example be 'remember to measure your glucose level' (message programme to be delivered by the dispensing device to the user each morning at 8 o'clock) and so on.
  • standard instructions can be included in the programming circuit so that the pump may deliver verbal messages to the user instead of audio signals such as beep sounds.
  • the message could for instance be: 'Pump is stopped' or 'This is your third bolus in a row and you have taken a total of eight bolus dosages today' or 'The pump will be empty in two hours' and so on.
  • the audio capability described above will render the dispensing device provided with such capability much more user-friendly, especially for users initiating a treatment or not very disciplined as regards compliance.
  • Either the controller or the computing unit mounted in the printed circuit may be programmed to react to information regarding actual glucose blood level inputted by the user perhaps together with other information, such as data regarding the timing and constitution of the last meal, to alter the programme of the dispensing flow or dosage to take into consideration this information such that the dispensing device to a certain extent constitutes a closed loop, fuzzy logic, semi-automatic self re- programming insulin dispensing device.

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  • Health & Medical Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Veterinary Medicine (AREA)
  • Hematology (AREA)
  • Vascular Medicine (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Dermatology (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Media Introduction/Drainage Providing Device (AREA)

Abstract

L'invention concerne un dispositif de distribution de médicament autonome, portatif, jetable, qui comprend un boîtier (36), des moyens adhésifs pour fixer ledit boîtier sur la peau d'un utilisateur dudit dispositif, un récipient (52) cylindrique pour contenir le médicament, qui est compris dans le boîtier et intègre un piston et présente une extrémité distale ouverte et une extrémité distale fermée par un corps de fermeture (54), réalisé dans un matériau, de préférence de la silicone, qui peut être perforé par une aiguille, une tige de piston (44) dont la surface extérieure est munie d'un premier filet de vis s'étendant longitudinalement, pour déplacer le piston en direction de l'extrémité proximale fermée, une roue à rochet (40) munie d'une ouverture centrale (42) pour recevoir la tige de piston et comprenait un second filet de vis en prise avec le premier filet de vis, de sorte que la rotation de la roue à rochet dans un premier sens de rotation déplace le piston, une plaque pivotante (78) pouvant pivoter autour d'un axe adjacent à la roue à rochet et comportant un cliquet (74) pour faire entrer les dents de la roue à rochet, de manière que le pivotement de la plaque pivotante dans un second sens de rotation induise la rotation de la roue à rochet dans le premier sens de rotation, un ressort de tige (66) adapté et disposé de sorte à appliquer une force à effet ressort à la plaque, en un premier point espacé de l'axe pour faire pivoter la plaque dans le second sens de rotation, ainsi qu'un actionneur alimenté par batterie pour faire tourner la plaque pivotante dans un troisième sens de rotation opposé au deuxième sens de rotation.
PCT/DK2005/000061 2004-01-29 2005-01-28 Dispositif de distribution de medicament, jetable Ceased WO2005072795A2 (fr)

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