GB2616211A - Assembly of a reset mechanism for an injector pen - Google Patents

Assembly of a reset mechanism for an injector pen Download PDF

Info

Publication number
GB2616211A
GB2616211A GB2309090.5A GB202309090A GB2616211A GB 2616211 A GB2616211 A GB 2616211A GB 202309090 A GB202309090 A GB 202309090A GB 2616211 A GB2616211 A GB 2616211A
Authority
GB
United Kingdom
Prior art keywords
housing
jig
reset mechanism
injector pen
locking sleeve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
GB2309090.5A
Inventor
Knowles Stephen
Uhman Michal
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.)
IND DESIGN CONSULTANCY Ltd
Original Assignee
IND DESIGN CONSULTANCY 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 IND DESIGN CONSULTANCY Ltd filed Critical IND DESIGN CONSULTANCY Ltd
Publication of GB2616211A publication Critical patent/GB2616211A/en
Pending 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
    • A61M5/178—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
    • A61M5/31535—Means improving security or handling thereof, e.g. blocking means, means preventing insufficient dosing, means allowing correction of overset dose
    • A61M5/31543—Means improving security or handling thereof, e.g. blocking means, means preventing insufficient dosing, means allowing correction of overset dose piston rod reset means, i.e. means for causing or facilitating retraction of piston rod to its starting position during cartridge change
    • 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
    • A61M5/2422—Ampoule syringes, i.e. syringes with needle for use in combination with replaceable ampoules or carpules, e.g. automatic using emptying means to expel or eject media, e.g. pistons, deformation of the ampoule, or telescoping of the ampoule
    • 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
    • A61M5/31535—Means improving security or handling thereof, e.g. blocking means, means preventing insufficient dosing, means allowing correction of overset dose
    • A61M5/31541—Means preventing setting of a dose beyond the amount remaining in the cartridge
    • 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
    • A61M5/31583—Constructional features or modes of drive mechanisms for piston rods based on rotational translation, i.e. movement of piston rod is caused by relative rotation between the user activated actuator and the piston rod
    • A61M5/31585—Constructional features or modes of drive mechanisms for piston rods based on rotational translation, i.e. movement of piston rod is caused by relative rotation between the user activated actuator and the piston rod performed by axially moving actuator, e.g. an injection button
    • 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
    • A61M2207/00—Methods of manufacture, assembly or production
    • A61M2207/10—Device therefor

Abstract

A reset mechanism for a re-usable injector pen comprises a ratchet housing (42), a piston rod (16), a bearing element (44) and a locking sleeve (48). The locking sleeve (48) can slide axially but not rotate relative to the ratchet housing (42). The bearing element (44) can rotate relative to the ratchet housing (42), except when prevented from doing so by engagement with the locking sleeve (48). By providing the ratchet housing (42) as a separate element from the injector pen housing (2), the reset mechanism can be manufactured as an independent sub-assembly, which aids the assembly process of the injector pen. A jig (70) may be used to align the parts of the reset mechanism and the injector pen housing (2), thereby avoiding the need for an alignment feature inside the pen housing (2). In turn, this enables a thread (5) for attachment of a drug cartridge housing (4) to be moulded inside the injector pen housing( )2 using a rotational core.

Claims (24)

1. A reset mechanism for an injector pen comprising: a ratchet housing (42), which defines an axis; a piston rod (16), which extends along the axis; a bearing element (44), which engages the piston rod (16) and, relative to the ratchet housing (42), is capable of rotation about the axis but incapable of movement parallel to the axis; and a locking sleeve (48), which engages the ratchet housing (42) to prevent relative rotation between the locking sleeve (48) and the ratchet housing (42), while permitting movement of the locking sleeve (48) parallel to the axis between a resetting state, in which the bearing element (44) is free to rotate about the axis, and an injection state, in which the locking sleeve (48) engages the bearing element (44) to prevent the bearing element (44) rotating about the axis; characterized in that the ratchet housing (42) is a separate component from a pen housing of the injector pen, whereby the reset mechanism is configured as a discrete sub-assembly suitable for subsequent assembly into an injector pen.
2. A reset mechanism according to claim 1, further comprising attachment means suitable for securing the ratchet housing (42) against axial or rotational movement after the reset mechanism has been assembled into an injector pen.
3. A reset mechanism according to claim 2, wherein the attachment means comprises crush ribs (51) on an external surface of the ratchet housing (42).
4. A reset mechanism according to any preceding claim, further comprising means (50) for biasing the locking sleeve (48) towards the resetting state.
5. A reset mechanism according to claim 4, wherein the biasing means (50) is a compression spring that acts between the ratchet housing (42) and the locking sleeve (48).
6. A reset mechanism according to any preceding claim, wherein the ratchet housing (42) comprises a plurality of axially extending channels (60) and wherein the locking sleeve (48) comprises a plurality of axially extending arms (58) engaged in the channels (60) of the ratchet housing (42).
7. A reset mechanism according to claim 6, further comprising a first snap fit coupling (59) that retains the arms (58) of the locking sleeve (48) in the channels (60) of the ratchet housing (42), while permitting movement of the arms (58) along the channels (60).
8. A reset mechanism according to any preceding claim, further comprising a second snap fit coupling (55) that retains the bearing element (44) on the ratchet housing (42), while permitting the bearing element (44) to rotate relative to the ratchet housing (42).
9. A reset mechanism according to any preceding claim, wherein the bearing element (44) engages the piston rod (16) via a screw-thread coupling (36,46).
10. A combination of a jig (70) and a reset mechanism sub-assembly according to any of claims 1 to 9, the jig (70) comprising: a first seat (74) receiving the locking sleeve (48) of the reset mechanism in a predetermined angular alignment; and a second seat (86) receiving the ratchet housing (42) of the reset mechanism in a predetermined angular alignment such that the locking sleeve (48) on the first seat (74) engages the ratchet housing (42) on the second seat (86).
11. A combination according to claim 10, the jig (70) further comprising a third seat (88) receiving the bearing element (44) in a predetermined angular alignment.
12. A combination according to claim 10 or claim 11, further comprising an injector pen housing (2); the jig (70) further comprising a fourth seat (90) receiving the injector pen housing (2) in a predetermined angular alignment.
13. A combination according to claim 12, wherein the fourth seat is provided on a movable ring (90) that determines the angular alignment of the injector pen housing (2), the movable ring (90) being capable of moving axially along the jig (70) from an initial position to a final position.
14. A combination according to claim 13, further comprising a compression spring (93) that acts on the movable ring (90) to urge it towards the initial position.
15. A combination according to any of claims 12 to 14, wherein the injector pen housing (2) comprises an external alignment feature (6), which engages the fourth seat (90) of the jig (70) to determine the angular alignment of the injector pen housing (2) on the jig (70).
16. A method of forming a reset mechanism according to any of claims 1 to 9 on a jig (70), the method comprising the steps of: (a) receiving a locking sleeve (48) in a predetermined angular alignment on a first seat (74) of the jig (70); (b) receiving a ratchet housing (42) in a predetermined angular alignment on a second seat (86) of the jig (70) such that the locking sleeve (48) on the first seat (74) engages the ratchet housing (42) on the second seat (86); and (c) receiving a bearing element (44) on a third seat (88) of the jig (70).
17. A method according to claim 16, further comprising: before step (b), engaging the bearing element (44) with the ratchet housing (42) such that the bearing element (44) is retained on the ratchet housing (42) while permitting the bearing element (44) to rotate relative to the ratchet housing (42); and thereafter carrying out steps (b) and (c) together.
18. A method according to claim 16 or claim 17, further comprising the step of threading an externally threaded piston rod (16) into an internally threaded bore (46) in the bearing element (44). - 22 -
19. A method according to any of claims 16 to 18, further comprising the step of interposing a compression spring (50) between the ratchet housing (42) and the locking sleeve (48).
20. A method according to any of claims 16 to 19, wherein the ratchet housing (42) defines an axis of the reset mechanism; and step (b) comprises engaging a plurality of axially extending arms (58) of the locking sleeve (48) in a plurality of axially extending channels (60) of the ratchet housing (42).
21. A method of using a jig (70) to assemble an injector pen housing (2) and a reset mechanism sub-assembly according to any of claims 1 to 9, the method comprising the steps of: mounting the sub-assembly on a jig (70) in a predetermined angular alignment; receiving the injector pen housing (2) on the jig (70) in a predetermined angular alignment; and then moving the injector pen housing (2) axially along the jig (70) to assemble the injector pen housing (2) and the reset mechanism sub-assembly.
22. A method according to claim 21, wherein moving the injector pen housing (2) axially along the jig (70) force-fits the injector pen housing (2) onto the reset mechanism sub-assembly.
23. A method according to claim 21 or claim 22, wherein the jig (70) comprises a movable ring (90) that determines the angular alignment of the injector pen housing (2); the method comprising moving the ring (90) axially along the jig (70) from an initial position to a final position to maintain the angular alignment of the injector pen housing (2) as the injector pen housing (2) is assembled onto the sub-assembly.
24. A method according to any of claims 21 to 23, wherein the step of mounting the sub-assembly on the jig (70) comprises forming the sub-assembly on the jig (70) according to the method of any of claims 16 to 20.
GB2309090.5A 2020-11-18 2021-11-08 Assembly of a reset mechanism for an injector pen Pending GB2616211A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2018121.0A GB2601128A (en) 2020-11-18 2020-11-18 Assembly of a reset mechanism for an injector pen
PCT/EP2021/080894 WO2022106232A1 (en) 2020-11-18 2021-11-08 Assembly of a reset mechanism for an injector pen

Publications (1)

Publication Number Publication Date
GB2616211A true GB2616211A (en) 2023-08-30

Family

ID=74046544

Family Applications (2)

Application Number Title Priority Date Filing Date
GB2018121.0A Pending GB2601128A (en) 2020-11-18 2020-11-18 Assembly of a reset mechanism for an injector pen
GB2309090.5A Pending GB2616211A (en) 2020-11-18 2021-11-08 Assembly of a reset mechanism for an injector pen

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB2018121.0A Pending GB2601128A (en) 2020-11-18 2020-11-18 Assembly of a reset mechanism for an injector pen

Country Status (2)

Country Link
GB (2) GB2601128A (en)
WO (1) WO2022106232A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115054773A (en) * 2022-07-14 2022-09-16 湖南千山医疗器械有限公司 Drive insulin pump that resets

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120310206A1 (en) * 2009-09-30 2012-12-06 Sanofi-Aventis Deutschland Gmbh Injection Device
US20130245558A1 (en) * 2010-11-18 2013-09-19 Shl Group Ab Medicament Delivery Device
GB2530076A (en) * 2014-09-12 2016-03-16 Shaily Medical Plastics Private Ltd Injector pens
US20200061295A1 (en) * 2008-12-12 2020-02-27 Sanofi-Aventis Deutschland Gmbh Drive mechanism for a medication delivery device and medication delivery device
EP2274030B2 (en) * 2008-05-02 2020-03-18 Sanofi-Aventis Deutschland GmbH Medication delivery device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA941881B (en) 1993-04-02 1995-09-18 Lilly Co Eli Manifold medication injection apparatus and method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2274030B2 (en) * 2008-05-02 2020-03-18 Sanofi-Aventis Deutschland GmbH Medication delivery device
US20200061295A1 (en) * 2008-12-12 2020-02-27 Sanofi-Aventis Deutschland Gmbh Drive mechanism for a medication delivery device and medication delivery device
US20120310206A1 (en) * 2009-09-30 2012-12-06 Sanofi-Aventis Deutschland Gmbh Injection Device
US20130245558A1 (en) * 2010-11-18 2013-09-19 Shl Group Ab Medicament Delivery Device
GB2530076A (en) * 2014-09-12 2016-03-16 Shaily Medical Plastics Private Ltd Injector pens

Also Published As

Publication number Publication date
WO2022106232A1 (en) 2022-05-27
GB202018121D0 (en) 2020-12-30
GB2601128A (en) 2022-05-25

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