CA2439896C - Improvements in and relating to an injection device - Google Patents

Improvements in and relating to an injection device Download PDF

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Publication number
CA2439896C
CA2439896C CA2439896A CA2439896A CA2439896C CA 2439896 C CA2439896 C CA 2439896C CA 2439896 A CA2439896 A CA 2439896A CA 2439896 A CA2439896 A CA 2439896A CA 2439896 C CA2439896 C CA 2439896C
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CA
Canada
Prior art keywords
belt
drive
injection device
semi rigid
dose
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.)
Expired - Fee Related
Application number
CA2439896A
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French (fr)
Other versions
CA2439896A1 (en
Inventor
Christopher Nigel Langley
David Aubrey Plumptre
Robert Woolston
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DCA Design International Ltd
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DCA Design International Ltd
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Publication date
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Publication of CA2439896A1 publication Critical patent/CA2439896A1/en
Application granted granted Critical
Publication of CA2439896C publication Critical patent/CA2439896C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • A61M5/178—Syringes
    • A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
    • 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
    • A61M5/31513—Piston constructions to improve sealing or sliding
    • 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
    • A61M5/31533—Dosing mechanisms, i.e. setting a dose
    • A61M5/31545—Setting modes for dosing
    • A61M5/31548—Mechanically operated dose setting member
    • A61M5/3155—Mechanically operated dose setting member by rotational movement of dose setting member, e.g. during setting or filling of a syringe
    • A61M5/31553—Mechanically operated dose setting member by rotational movement of dose setting member, e.g. during setting or filling of a syringe without axial movement of dose setting member
    • 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
    • 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
    • A61M2005/3152—Piston or piston-rod constructions, e.g. connection of piston with piston-rod including gearings to multiply or attenuate the piston displacing force
    • 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
    • A61M5/24—Ampoule syringes, i.e. syringes with needle for use in combination with replaceable ampoules or carpules, e.g. automatic
    • 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
    • A61M5/31533—Dosing mechanisms, i.e. setting a dose
    • A61M5/31545—Setting modes for dosing
    • A61M5/31548—Mechanically operated dose setting member
    • A61M5/31556—Accuracy improving means
    • A61M5/31558—Accuracy improving means using scaling up or down transmissions, e.g. gearbox
    • 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
    • A61M5/31533—Dosing mechanisms, i.e. setting a dose
    • A61M5/31545—Setting modes for dosing
    • A61M5/31548—Mechanically operated dose setting member
    • A61M5/31561—Mechanically operated dose setting member using freely adjustable volume steps
    • 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
    • A61M5/31533—Dosing mechanisms, i.e. setting a dose
    • A61M5/31545—Setting modes for dosing
    • A61M5/31548—Mechanically operated dose setting member
    • A61M5/31563—Mechanically operated dose setting member interacting with a displaceable stop member
    • 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
    • A61M5/31565—Administration mechanisms, i.e. constructional features, modes of administering a dose
    • A61M5/31576—Constructional features or modes of drive mechanisms for piston rods
    • A61M5/31578—Constructional features or modes of drive mechanisms for piston rods based on axial translation, i.e. components directly operatively associated and axially moved with plunger rod
    • 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
    • A61M5/31565—Administration mechanisms, i.e. constructional features, modes of administering a dose
    • A61M5/3159—Dose expelling manners
    • A61M5/31593—Multi-dose, i.e. individually set dose repeatedly administered from the same medicament reservoir

Abstract

Injection devices are known for the self administration of a medicament by patients in which the medicament is contained within a cartridge located within the injection device. It is a problem that such injection devices should be small enough to fit into a jacket pocket or a hand bag without difficulty. Concurrently, the injection device must be of size that enables a piston or similar used to drive a cartridge bung within the cartridge to be moved both to a maximum dispense position within the cartridge and to be fully withdrawn from the cartridge to allow for replacement of the cartridge. A
drive mechanism for an injection device is disclosed comprising a piston member 10, a semi rigid belt 18 connected to the piston member 10, a belt drive means to selectively engage with the semi rigid belt 18 to drive the semi rigid belt 18, and a dose setting mechanism to control the selective engagement of the semi rigid belt in which the semi rigid belt 18 includes a track incorporated therein and the belt drive means comprises a tooth 50 for selective engagement with the track to drive the belt 18 only when there is relative movement between the semi rigid belt 18 and the tooth 50 in a first direction. An injection device comprising such a drive mechanism is also disclosed.

Description

.19-03-2003 ~ . . , ~ GB02014 P95849WoD 20030227 Sp~AmendadaftaWdttenOpinion,wpd Improvements in and Relating to an Injection Device The present invention relates to improvements in an injection device, and in particular to improvements in aportable inj action device for dispensing controlled quantities of a medicament.
Inj action devices are known for the self administration of a medicament bypatients. For example, those suffering from diabetes mayrequire regular injections ofinsulin, others mayrequire regular inj actions of a growth hormone. Inj action devices allow the patient to select a dose and to administer that dose. It is known to automate this process so that a user need onlypress a button and the injection device will dispense a selected dose ofmedicament. This relieves the patient of the task of controlling the amount dispensed while manually expelling the medicament from the injection device. This is aparlicular problem for the elderly, the infirm, those suffering from vision difficulties and those suffering from diabetes related problems which impair their faculties.
The medicament is typically contained within a cartridge located within the inj action device. The cartridge has a bung or piston at one end which is driven towards a second end of the cartridge to expel the medicament from the inj action device. It is a problem that inj cction devices should be small enough to fit into a j acket pocket or a hand bag without difficulty. At the same time, the inj action device must be of a size that enables a piston or the like used to drive the cartridge bung within the carkridge to be moved both to a maximum dispense position within the cardridge and to be fully withdrawn from the carkridge to allow for replacement of the cartridge.
US 6110149 discloses a drive mechanism for an injection device in which a piston is successively moved in relation to a first end of a medicament cartridge containing a medicament selectively to drive a bung closing a first end of the medicament cartridge into the medicament cartridge to expel medicament through a deliverymember located at a second end of the medicament cartridge, in which the drive mechanism comprises a piston member, a semi rigid belt including a track incorporated therein connected to the piston member, a belt drive means to drive the semi rigid belt, and a dose setting mechanism to confirol the selective engagement ofthe semi rigid belt: This provides one solution to the problems noted.
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19-03-2003 ' ~ . . . ._ . . . . . . . . .. .. . . .. .. . .. GB02014 -., P958491~IflD 20030227 SpxAmendedafterWrittenopininn.wpd 2 It is an advantage of the present invention that it provides another solution to these conflicting requirements.
According to a first aspect ofthe present invention, a drive mechanism for an inj ectxon device in which a piston is successively moved in relation to a first end of a medicament cartridge containing a medicament selectivelyto drive a bung closing a first end ofthe medicament cartridge into the medicament cartridge to expel medicament through a deliverymember located at a second end of the medicament cartridge is disclosed, in which the drive mechanism comprises a piston member, a semi rigid belt including a track incorporated therein connected to the piston member, a belt drive means to drive the semi rigid belt, and a dose setting mechanism to control the selective engagement of the semi rigid belt characterised in that the belt drive means selectively engages with the semi rigidbelt and in that the belt drive means comprises atooth for selective engagement with the track to drive thebelt onlywhen there is relative movementbetween the semi rigidbelt and the tooth in a first direction..
Preferably, the belt drive means further comprises an inner gear adapted to engage with the track in the semi rigid belt and be driven by movement of the track in the first direction.
Preferably, the belt drive means further comprises a flexible member to carry the tooth, a second piston member to carry the flexible memb er and a charge means to drive the belt drive means in the first direction. More preferably, the charge means comprises a spring.
Preferably, the secondpistonmemberincludes abiased dosebutton adaptedreleasablyto retain a dosing spindle in a desired position.
Preferably, the dose setting mechanism comprises a dial dose means, a dosing spindle, an outer gear, an outer gear drive means located between the spindle and the outer gear, a plurality of intermediate gears interposed between the inner gear and the outer gear, and a dose trip peg carried by one of the plurality of intermediate gears to control the selective engagement of the semi rigid belt.
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19-03-2003 . . "' , ' v ~~ GB02014 ,.~~.. .. . .
P95849W0 20030227 SpecAmendedafterWrittenOpinian.wpd Preferably the dose setting mechanism further comprises displacement means to displace the dosing spindle.
Preferably, the semi rigid belt and the piston member are formed as a unitary component.
According to a second aspect of the present invention, an inj ection device having a housing is characterised in that the device further comprises a drive mechanism according to the first aspect of the present invention.
Preferably, the displacement means comprises a button located for displacement within the housing of the injection device.
Preferably, the housing has an aperture for cooperation with the or a dose button.
The invention will now be described, bywayofexample only, with referexice to the accompanying drawings in which:
Figure 1 shows a side section of an inj ection device having a drive mechanism according to the present invention in which the injection device is closed and a medicament cartridge is full;
Figure 2 shows a side section similar to Figure 1 with the injection device ready for use;
Figure 3 shows a side section similar to Figure 1 with a dosage of medicament dialled; and Figure 4 shows a side section similar to Figure 1 with the dosage delivered.
Like reference numerals will be used to refer ta-like parts of the injection device.
Referring first to Figure 1 there maybe seen an inj ection device in accordance with the present invention. The inj ection device comprises a main housing 2 and a drive mechanism. A needle unit 4 including a delivery member in the form of a hollow needle is secured to a first end ofthe main housing 2. A medicament cartridge 6 having a first end and a second end maybe stored in the main housing 2. When the needle unit 4 is in place, the needle unit 4 pierces a flexible membrane at the first end of the medicament cartridge 6. A displaceable bung 8 is located at the second end of the AAAFNt~Ff) SNFFT

:: ~ , P93849W0 20030227 SpacAm~dedafterWrittenOpinirn.wpd 4 medicament cartridge 6. A cover (not shown) may be provided over the first end of the main housing 2 to protect the needle unit 4 from damage and a user from inadvertent pricking by the needle. The cover also provides a discrete appearance for the injection device.
The drive mechanism comprises apiston member I0, a semi-rigid belt 18 connected to the piston ~ member I 0, a belt drive means to selectively engage with the semi-rigid belt 18 to drive the semi-rigid belt 18, and a dose setting mechanism to control the selective engagement of the semi-rigid belt 18. The semi rigid belt 18 may comprise any suitable materiai, for example spring steel or a plastics material. Where the semi rigid belt and the piston member are formed from a plastics material, they may be formed as a unitary component.
The piston member 10 is located adj scent the bung in the medicament cartridge 6. The piston member 10 is connected to a first end o f the semi-rigid belt I f . Guide means are provided in the main housing 2 to direct the semi-rigid belt 18. In the illustrated embodiment, first, second and third guide means are shown. The first guide means 30 is located towards the fast end ofthe semi-rigid belt I 8 to direct the piston member 10 towards the first end of the medicam~t cartridge 6. The second guide means 31 is substantiallyU shaped. The third guide means 32 is located substantially parallel to and adjacent with the medicament carixidge 6.
The semixigid belt 18 is piovided along a portion of its length with a track.
Conveniently, the track takes the form of a series of openings which may be selectively engaged, by the belt drive means.
The track is also engaged by a first part of an inner gear 20 of a planetary gear arrangement. The planetary gear arrangement further comprises a~ outer gear 22 and a plurality ofintermediate planetary gears 24 located between a second part of the inner gear 20 and an inner track on the outer gear 22. A dose trip peg 26 is adapted to rotate about a first end. In use, the first end is carried from a central shaft of the inner gear 20. The dose trip peg 26 is also caned from are of the intermediate planetary gears 24. Thus, as the intermediate planetary gears 24 precess about the inner gear 20, the dose trip peg 26 is caused to rotate about the first end A second end of the dose trip peg 26 is provided with a finger or tab 28 the purpose of which is described below.
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P95849VN0 2003U227 Sp~AmendadaRerWrittcnOpinion.wpd The outer gear 22 is also provided with an outer track. The outer track engages with a worm gear 48 forming a part of the dose setting mechanism.
The worm gear 48 is located within the housing 2 by first and second lugs.
A dosing spindle 38 is provided with a spline 40 at a first end thereof. The spline 40 passes througk~ the worm gear 48 to drive the worm gear 48. The dosing spindle 38 passes through a dose dial means 42. Operation ofthe dose dial means 42 causes rotation ofthe dosing spindle 3 8 and the associated spline 40.
A charge spring 12 is provided between a first end of the main housing 2 and a second piston member 34. The main housing 2 and the second piston member 34 are preferably each provided with a suitably shaped recess to locate and to retain the charge spring 12.
The second piston member 34 is located between the charge spring 12 and a first end ofthe dosing spindle 38. The second pistonmember 34 includes a slidable biased dose button 44 retained within a suitable bore provided in the second piston member 34.
The second piston member 34 additionallycomprises a flexible member S2. The flexible member 1 S S2 is connected at a first end to the second piston member 34 and is provided at an second end with a dog tooth S0. The flexible member S2 is biased towards the semi-rigid belt 18.
A second end of the dose setting spindle 38 is provided with an abutment surface 46.
A cap orbutton S4 is provided adapted formovementwithrespectto the main housing 2. In the illustrated embodiment, the button S4 is adapted for pivotingmovement with respect to the main housing 2. The button S4 is provided with a stop member S6 extending from an underside of the button 54. The stop member 56 may take the form of a web extending from an underside of the button S4.
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P958A9VN0 20030227 SpacAmendodaRaWrittenOpinian.wpd Tn Figure 1, the inj ection device is in a closed or 'off' condition. The abutment surface of the dosing spindle 3 8 is in abutment with the stop member 56 ofthe button 54. The dose button 44 is retained within the second piston member 34 against an inner wall ofthe main housing 2.
The dose button 44. is biased towards the inner wall of the main housing 2. The finger or tab 28 of the dose trip peg S 26 is in contact with the flexib 1e member 52 to hold the dog tooth 50 apart from the track in the semi rigid belt 18.
In order to operate the device, a user first depresses the button 54. The stop member 56 then causes the dosing spindle 38 to be displaced towards a first end of the main housing 2. This causes the first end of the dosing spindle 3 8 to displace the second piston member 34 towards the first end of the housing 2 thereby compressing the charge spring 12. When the button 54 has been fully depressed, the dose button 44 enters into aligcunent with and passes through an opening 5 8 provided in a wall of the main housing 2. This retains the second piston member 34 in the same positionrelative to themainhousing2 until the dose button 44 is pushedbackthrough the opening.
The button 54 maybe biased such that when the dosing spindle 26 has been displaced the button 54 reverts to the closed position (Figure 2).
The user now uses the dial dose means 42 to set the required dose. This causes rotation ofthe dose setting spindle 26 thereby driving the outer gear 22 through the worna gear 48. The inner gear 20 and the piston member 10 remain stationery during this operation. Due to the relative motion of the outer gear 22 with respect to the inner gear 2Q,the intermediate planetary gears 24 are caus ed to rotate about the inner gear 20. This causes the dose trip peg 26 to rotate about the first end. Thus, the angular displacement ofthe dose trip peg 26 is proportionate to the dose that is dialled by a user.
Dialling of the dose causes the finger or tab 28 ofthe dose trip peg 26 to move away from the flexible member 52 allowing the dog tooth 50 to come into contact with the track in the semi rigid belt 18. It will be understood that the dog tooth 50 may enter through one ofthe openings in the track or abut a portion ofthe semi rigidbelt intermediate adjacent openings in thetrack (Figure 3).
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CA 02439896 2003-09-04 GgQ2014 . , P95849W~0 2003022 SpecAmavdedafterWrittenopinion.wpd 7 The dose button 44 is then depressed out ofengagement with the opening 58. The charge spring I 2 then drives the second piston member 34 away from the first end of the main housing 2. The flexible member 52 is driven towards a second end of the main housing. The dog tooth 50 is moved into engagement with an edge of the current opening (or next opening if adjacent an intermediate belt portion). The semi rigid belt 18 is then driven by the movement of the second piston member 34 causing the piston member 10 to b a driven into the bung 8 to drive the bung 8 towards the second end ofthe medicament cartridge 6. As the semi rigid belt I
8 is drive, the semi rigid belt 18 drives the first part ofthe inner gear 20 thereby rotating the dose trip peg 26 back towards the flexible member 50. When the finger or tab ofthe dose trip peg 26 displaces the dog tooth 50 from the semi rigid belt 18, the semi rigid belt 18 is no longer driven by the dog tooth 50 and further movement of the second piston member 34 has no effect upon the piston member 10 (Figure 4) The second piston member 34 then only acts to return the dosing spindle 38 and the associated spline 40 to the position shown in Figure 1.
This process maybe repeated until the medicament cartridge 6 is empty, the medicament cartridge 6 contains insuff cient medicament to deliverthe dialled dose or some other condition is met. The piston member 10 may then be withdrawn to allow replsacement of the medicament cartridge 6.
For example, the inner gear 20 maybe driven to return the semi rigid belt 18 to the position shown in Figure 1. It will be understood that the dog tooth 50 may be so shaped as to allow passage of the semi rigid belt 18 in a first direction but to engage the track when the semi rigid belt 18 is moved in an opposite direction.
The relative arrangement ofthe drive mechanism and the medicament cartridge means that the main housing provides a relatively large flat face where a relatively large dase display, such as a liquid crystal display may be located. This in turn enables the dose display to use relatively large figures or other characters. This is an advantage for those with impaired vision.
AMFNfIFi~ ~HFFT

Claims (11)

1 A drive mechanism for an injection device in which a piston is successively moved in relation to a first end of a medicament cartridge (6) containing a medicament selectively to drive a bung (8) closing a first end of the medicament cartridge (6) into the medicament cartridge (6) to expel medicament through a delivery member (4) located at a second end of the medicament cartridge, in which the drive met comprises a piston member, a semi rigid belt (18) including a track incorporated therein connected to the piston member (10), a belt drive means to drive the semi rigid belt (18), and a dose setting mechanism to control the selective engagement of the semi rigid belt (18) is characterised in that the belt drive means selectively engages with the semi rigid belt (18) and in that the belt drive means comprises a tooth (50) for selective engagement with the track to drive the belt only when there is relative movement between the semi rigid belt (18) and the tooth (50) in a first direction.
2 A drive mechanism for an injection device according to claim 1, characterised in that the belt drive means further comprises an inner gear (20) adapted to engage with the track in the semi rigid belt (18) and be driven by movement of the track in the first direction.
3 A drive mechanism according to either claim 1 or claim 2, characterised in that the belt drive means further comprises a flexible member (52) to carry the tooth (50), a second piston member (34) to carry the flexible member (52) and a charge means to drive the belt drive means in the first direction.
4 A drive mechanism according to claim 3, characterised in that the charge means comprises a spring (12).
A drive mechanism according to claim 3 or claim 4, characterised in that the second piston member (34) includes a biased dose button (44) adapted releasably to retain a dosing spindle (34) in a desired position.
6 A drive mechanism for an injection device according to claim 2, characterised in that the dose setting mechanism comprises a dial dose means (42), a dosing spindle (38), an outer gear (22), an outer gear drive means located between the spindle (38) and the outer gear (22), a plurality of intermediate gears (24) interposed between the inner gear (20) and the outer gear (22), and a dose trip peg (26) carried by one of the plurality of intermediate gears (24} to control the selective engagement of the semi rigid belt (18).
7 A drive mechanism for an injection device according to claim 5, characterised in that the dose setting mechanism further comprises displacement means to displace the dosing spindle (38).
8 A drive mechanism for an injection device according to any previous claim, characterised in that the semi rigid belt (18) and the piston member (10) are formed as a unitary component.
9 An injection device having a housing, characterised in that the device further comprises a drive mechanism according to any previous claim.
An injection device according to claim 9, characterised in that the displacement means comprises a button (54) located for displacement within the housing (2) of the injection device.
11 An injection device according to either claim 9 or claim 10, characterised in that the housing has an aperture for cooperation with a or the dose button (44).
CA2439896A 2001-03-27 2002-03-26 Improvements in and relating to an injection device Expired - Fee Related CA2439896C (en)

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GB0107601.7 2001-03-27
GBGB0107601.7A GB0107601D0 (en) 2001-03-27 2001-03-27 Improvements in and relating to and injection device
PCT/GB2002/001418 WO2002076535A1 (en) 2001-03-27 2002-03-26 Improvements in and relating to an injection device

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CA2439896C true CA2439896C (en) 2010-06-15

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JP (1) JP4350376B2 (en)
AT (1) ATE403455T1 (en)
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DE (1) DE60228060D1 (en)
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ES (1) ES2311597T3 (en)
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Families Citing this family (50)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6663602B2 (en) 2000-06-16 2003-12-16 Novo Nordisk A/S Injection device
GB0107608D0 (en) * 2001-03-27 2001-05-16 Dca Design Int Ltd Improvements in and relating to an injection device
EP1487520A1 (en) 2002-03-18 2004-12-22 Eli Lilly And Company Medication dispensing apparatus with gear set for mechanical advantage
GB0308267D0 (en) * 2003-04-10 2003-05-14 Dca Design Int Ltd Improvements in and relating to a pen-type injector
DE10327119A1 (en) 2003-06-13 2004-12-30 Aventis Pharma Deutschland Gmbh Injection cap
US7857791B2 (en) 2004-03-30 2010-12-28 Eli Lilly And Company Medication dispensing apparatus with gear set having drive member accommodating opening
JP4874233B2 (en) 2004-03-30 2012-02-15 イーライ リリー アンド カンパニー Drug delivery device with spring-driven fixation feature enabled by final dose administration
CA2584760C (en) 2004-10-21 2013-12-24 Novo Nordisk A/S Dial-down mechanism for wind-up pen
DE102004063664A1 (en) * 2004-12-31 2006-07-20 Tecpharma Licensing Ag Real-time display of a device for metered administration of a product
DE602007004972D1 (en) 2006-05-16 2010-04-08 Novo Nordisk As GEARING MECHANISM FOR AN INJECTION DEVICE
DK2023982T3 (en) 2006-05-18 2012-10-01 Novo Nordisk As Injection device with mode locking means
DE102007058659B4 (en) * 2007-12-06 2009-12-10 Tecpharma Licensing Ag Dose indicator for a device for metered delivery of a fluid product
US7959598B2 (en) 2008-08-20 2011-06-14 Asante Solutions, Inc. Infusion pump systems and methods
EP2370135B1 (en) * 2008-12-09 2020-02-05 Becton, Dickinson and Company Lever and gear force multiplier medication delivery system for high pressure injection system
WO2011026931A1 (en) * 2009-09-07 2011-03-10 Sanofi-Aventis Deutschland Gmbh Drive mechanism for drug delivery device
EP2292286A1 (en) * 2009-09-07 2011-03-09 Sanofi-Aventis Deutschland GmbH Drive mechanism for a medication delivery device and medication delivery device
DK2482884T3 (en) * 2009-09-30 2016-02-08 Sanofi Aventis Deutschland PHARMACEUTICAL FEED DEVICE AND drive section TO A drug delivery device
JP5752692B2 (en) * 2009-09-30 2015-07-22 サノフィ−アベンティス・ドイチュラント・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング Use of drive mechanism for drug delivery device and reset member for drive mechanism
TW201127435A (en) * 2009-09-30 2011-08-16 Sanofi Aventis Deutschland Drive mechanism for a drug delivery device
US9463278B2 (en) * 2009-09-30 2016-10-11 Sanofi-Aventis Deutschland Gmbh Resettable drive mechanism for a drug delivery device with guide track and blocking means
JP6159262B2 (en) * 2011-03-16 2017-07-05 サノフィ−アベンティス・ドイチュラント・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング Drive mechanism for drug delivery device and drug delivery device
US9731075B2 (en) * 2011-06-17 2017-08-15 Sanofi-Aventis Deutschland Gmbh Cartridge holder latch mating to axial through opening of bearing with central threaded opening
US9289556B2 (en) 2011-09-30 2016-03-22 Becton Dickinson France, S.A.S. Syringe with plunger rod having a flexible portion
BR112014016148A8 (en) 2011-12-29 2017-07-04 Novo Nordisk As augmentation / reduction mechanism for automatic injection device and torsion spring-based automatic injection device
EP3549524B1 (en) 2012-03-30 2023-01-25 Insulet Corporation Fluid delivery device with transcutaneous access tool, insertion mechanism and blood glucose monitoring for use therewith
CA2808738C (en) * 2012-09-26 2014-03-18 Gadlight, Inc Portable medicine injection device and metering system
JP6400078B2 (en) * 2013-04-10 2018-10-03 サノフイＳａｎｏｆｉ Automatic drug injection device with sophisticated drive mechanism
WO2015007811A1 (en) * 2013-07-17 2015-01-22 Sanofi Drive mechanism
WO2015007810A1 (en) * 2013-07-17 2015-01-22 Sanofi Drive mechanism
JP2018501925A (en) * 2014-12-08 2018-01-25 サノフイ Drug delivery device with drive mechanism
WO2017123525A1 (en) 2016-01-13 2017-07-20 Bigfoot Biomedical, Inc. User interface for diabetes management system
CA3009351A1 (en) 2016-01-14 2017-07-20 Bigfoot Biomedical, Inc. Adjusting insulin delivery rates
US9714140B1 (en) 2016-05-23 2017-07-25 James D. Gray Belt configured to include rigid portions
US10342926B2 (en) 2016-05-26 2019-07-09 Insulet Corporation Single dose drug delivery device
US10363372B2 (en) 2016-08-12 2019-07-30 Insulet Corporation Plunger for drug delivery device
WO2018035051A1 (en) 2016-08-14 2018-02-22 Insulet Corporation Drug delivery device with detection of position of the plunger
WO2018067645A1 (en) 2016-10-07 2018-04-12 Insulet Corporation Multi-stage delivery system
US10780217B2 (en) 2016-11-10 2020-09-22 Insulet Corporation Ratchet drive for on body delivery system
US10603440B2 (en) 2017-01-19 2020-03-31 Insulet Corporation Cartridge hold-up volume reduction
US10695485B2 (en) 2017-03-07 2020-06-30 Insulet Corporation Very high volume user filled drug delivery device
USD874471S1 (en) 2017-06-08 2020-02-04 Insulet Corporation Display screen with a graphical user interface
EP3662161A1 (en) 2017-08-03 2020-06-10 Insulet Corporation Micro piston pump
US10973978B2 (en) 2017-08-03 2021-04-13 Insulet Corporation Fluid flow regulation arrangements for drug delivery devices
US11786668B2 (en) 2017-09-25 2023-10-17 Insulet Corporation Drug delivery devices, systems, and methods with force transfer elements
USD928199S1 (en) 2018-04-02 2021-08-17 Bigfoot Biomedical, Inc. Medication delivery device with icons
US10874803B2 (en) 2018-05-31 2020-12-29 Insulet Corporation Drug cartridge with drive system
EP3801682A1 (en) 2018-06-06 2021-04-14 Insulet Corporation Linear shuttle pump for drug delivery
AU2019390474B2 (en) 2018-11-28 2023-03-30 Insulet Corporation Drug delivery shuttle pump system and valve assembly
US11369735B2 (en) 2019-11-05 2022-06-28 Insulet Corporation Component positioning of a linear shuttle pump
USD977502S1 (en) 2020-06-09 2023-02-07 Insulet Corporation Display screen with graphical user interface

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5637095A (en) * 1995-01-13 1997-06-10 Minimed Inc. Medication infusion pump with flexible drive plunger
US6110149A (en) * 1996-09-13 2000-08-29 Novo Nordisk A/S Syringe
US6796970B1 (en) * 1997-06-17 2004-09-28 Novo Nordisk A/S Dose setting device
US6585699B2 (en) 2000-04-13 2003-07-01 Nna/S Drug delivery device provided with a one-way mechanism
US6537251B2 (en) * 2000-10-05 2003-03-25 Novo Nordisk A/S Medication delivery device with bended piston rod

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CA2439896A1 (en) 2002-10-03
US7985201B2 (en) 2011-07-26
PT1372768E (en) 2008-11-17
JP2004533869A (en) 2004-11-11
DE60228060D1 (en) 2008-09-18
IL157603A (en) 2009-09-01
AU2002247840B2 (en) 2007-09-06
WO2002076535A1 (en) 2002-10-03
MXPA03008686A (en) 2004-04-20
DK1372768T3 (en) 2008-12-08
GB0107601D0 (en) 2001-05-16
ES2311597T3 (en) 2009-02-16
EP1372768A1 (en) 2004-01-02
US20040087904A1 (en) 2004-05-06
IL157603A0 (en) 2004-03-28
JP4350376B2 (en) 2009-10-21
ATE403455T1 (en) 2008-08-15
HK1062412A1 (en) 2004-11-05
EP1372768B1 (en) 2008-08-06

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