CA2554196A1 - Retractable syringe with plunger disabling system - Google Patents

Retractable syringe with plunger disabling system Download PDF

Info

Publication number
CA2554196A1
CA2554196A1 CA002554196A CA2554196A CA2554196A1 CA 2554196 A1 CA2554196 A1 CA 2554196A1 CA 002554196 A CA002554196 A CA 002554196A CA 2554196 A CA2554196 A CA 2554196A CA 2554196 A1 CA2554196 A1 CA 2554196A1
Authority
CA
Canada
Prior art keywords
plunger
plunger member
syringe
needle mount
needle
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.)
Granted
Application number
CA002554196A
Other languages
French (fr)
Other versions
CA2554196C (en
Inventor
Joseph Hermes Kaal
Craig Stephen Thorley
Damien Judd
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.)
Unitract Syringe Pty Ltd
Original Assignee
Individual
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
Priority claimed from AU2004900362A external-priority patent/AU2004900362A0/en
Application filed by Individual filed Critical Individual
Publication of CA2554196A1 publication Critical patent/CA2554196A1/en
Application granted granted Critical
Publication of CA2554196C publication Critical patent/CA2554196C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • 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
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321—Means for protection against accidental injuries by used needles
    • A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston
    • A61M5/3234—Fully automatic needle retraction, i.e. in which triggering of the needle does not require a deliberate action by the user
    • 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
    • A61M5/50—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 having means for preventing re-use, or for indicating if defective, used, tampered with or unsterile
    • A61M5/5066—Means for preventing re-use by disconnection of piston and piston-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
    • A61M5/50—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 having means for preventing re-use, or for indicating if defective, used, tampered with or unsterile
    • A61M5/508—Means for preventing re-use by disrupting the piston seal, e.g. by puncturing

Abstract

A retractable, single use syringe (10) comprises a barrel (20), a collar (60) mounted to the barrel, a retraction spring (70), a needle mount (40) located at a needle end (23) of the barrel and a plunger (30). The plunger comprises a first plunger member (31) and a second plunger member (33) that are releasably coupled to co-operatively maintain the retraction spring in an initial compressed state. The second plunger member (33) further comprises a seal (34) to prevent fluid leakage between plunger (30) and barrel (20). After depression of the plunger to deliver the fluid contents of the syringe, the first plunger member (31) engages the needle mount (40) with needle (12) attached thereto and is rotatably uncoupled from the second plunger member (33) to allow decompression of the retraction spring (70), which forces retraction of the first plunger member (31), needle mount (40) and needle (12) engaged therewith. The first plunger member (31) and the collar (60) comprise elements that co-operatively form a disabling means that prevents or at least minimizes the likelihood of subsequent depression or withdrawal of the plunger (30). Also following retraction of the first plunger member (31), the second plunger member (33) and seal (34) remains at the needle end (23) of the barrel (20) thereby preventing refilling and re-use of the syringe.

Claims (19)

1. A plunger for a retractable syringe having a spring and a needle mount, said plunger comprising a first plunger member and a second plunger member that are releasably engageable to co-operatively maintain said spring in an initial compressed state, arranged so that disengagement of said first plunger member and said second plunger member can facilitate decompression of said spring from an initial compressed state when required to force retraction of said first plunger member and said needle mount when engaged therewith, following depression of said plunger to deliver fluid contents of said syringe.
2. The plunger of Claim 1, wherein the first plunger member and the second plunger member are releasably engageable by a bayonet coupling.
3. The plunger of Claim 1 can be disengaged by rotation of the first plunger member relative to the second plunger member.
4. The plunger of Claim 1, wherein the first plunger member comprises a means for engaging said needle mount.
5. The plunger of Claim 1, wherein the means for engaging the needle mount comprises two barbed arms.
6. The plunger of Claim 1, wherein the second plunger member comprises a seal mounted thereto.
7. A retractable syringe comprising a plunger, a barrel, a spring and a needle mount, said plunger comprising a first plunger member and a second plunger member that are releasably engaged to co-operatively maintain said spring in an initial compressed state and are disengageable to facilitate decompression of said spring to force retraction of said first plunger member and said needle mount, when engaged therewith, following depression of said plunger to deliver fluid contents of said syringe.
8. The retractable syringe of Claim 7, wherein the first plunger member and the second plunger member are engaged by a bayonet coupling.
9. The retractable syringe of Claim 7, wherein the first plunger member and the second plunger member can be rotatably disengaged to facilitate decompression of the spring.
10. The retractable syringe of Claim 7, wherein the first plunger member comprises a means for engaging said needle mount.
11. The retractable syringe of Claim 8, wherein the means for engaging the needle mount comprises two barbed arms.
12. The retractable syringe of Claim 11, wherein the needle mount comprises recesses that are respectively engageable by the barbed arms.
13. The retractable syringe of Claim 7, wherein the second plunger member comprises a seal mounted thereto.
14. The retractable syringe of Claim 7, further comprising a collar mounted to the barrel.
15. The retractable syringe of Claim 14, wherein said collar comprises one or more projections capable of co-operating with one or more abutments of said first plunger member to form a plunger disabling means that is capable of preventing subsequent depression and/or withdrawal of said first plunger member following retraction of the needle mount.
16. The retractable syringe of Claim 15, wherein the one or more projections comprise two pawls that are engageable with respective steps on said first plunger member to co-operably prevent subsequent depression said first plunger member following retraction of the needle mount and thereby prevent syringe re-use.
17. The retractable syringe of Claim 15, wherein the one or more projections comprise two ribs that are engageable with respective ledges on said first plunger member to co-operably prevent subsequent withdrawal of said first plunger member following retraction of the needle mount and thereby prevent syringe re-use.
18. A retractable syringe comprising:
(i) a barrel;
(ii) a collar mounted to the barrel and comprising two ribs and two pawls;
(iii) a retraction spring;
(iv) a needle mount located at a needle end of the barrel; and (v) a plunger operably located in said barrel and engageable with said needle mount, said plunger comprising:

(a) a first plunger member having two steps and two ledges; and (b) a second plunger member and a seal mounted thereto;
wherein the first plunger member and the second plunger member are releasably coupled to co-operatively maintain said spring in an initial compressed state and can subsequently be rotatably uncoupled to facilitate decompression of said spring to force retraction of said first plunger member and said needle mount when engaged therewith following depression of said plunger to deliver fluid contents of said syringe and wherein said two pawls are engageable with respective steps on said first plunger member to co-operably prevent subsequent depression said first plunger member and said two ribs are engageable with respective ledges on said first plunger member to co-operably prevent subsequent withdrawal of said first plunger member following retraction of the needle mount and needle.
19. The syringe of Claim 18, arranged so that following retraction, of the first plunger member, the needle mount and needle, said second plunger member and said seal remain at a needle end the barrel thereby preventing refilling and re-use of the syringe.
CA2554196A 2004-01-28 2005-01-28 Retractable syringe with plunger disabling system Expired - Fee Related CA2554196C (en)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
AU2004900362A AU2004900362A0 (en) 2004-01-28 Retractable syringe and plunger therefor
AU2004900362 2004-01-28
AU2004906116A AU2004906116A0 (en) 2004-10-22 Retractable syringe with plunger disabling system
AU2004906116 2004-10-22
US63862304P 2004-12-22 2004-12-22
US60/638,623 2004-12-22
PCT/AU2005/000107 WO2005072801A1 (en) 2004-01-28 2005-01-28 Retractable syringe with plunger disabling system

Publications (2)

Publication Number Publication Date
CA2554196A1 true CA2554196A1 (en) 2005-08-11
CA2554196C CA2554196C (en) 2011-12-20

Family

ID=34830691

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2554196A Expired - Fee Related CA2554196C (en) 2004-01-28 2005-01-28 Retractable syringe with plunger disabling system

Country Status (5)

Country Link
US (1) US8002745B2 (en)
EP (1) EP1708772B1 (en)
CA (1) CA2554196C (en)
TW (1) TWI290840B (en)
WO (1) WO2005072801A1 (en)

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Also Published As

Publication number Publication date
EP1708772B1 (en) 2012-06-20
TWI290840B (en) 2007-12-11
US20080255513A1 (en) 2008-10-16
EP1708772A1 (en) 2006-10-11
TW200528156A (en) 2005-09-01
EP1708772A4 (en) 2007-10-17
US8002745B2 (en) 2011-08-23
CA2554196C (en) 2011-12-20
WO2005072801A1 (en) 2005-08-11

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