WO1989000057A1 - Single fill and use syringe - Google Patents

Single fill and use syringe Download PDF

Info

Publication number
WO1989000057A1
WO1989000057A1 PCT/AU1988/000230 AU8800230W WO8900057A1 WO 1989000057 A1 WO1989000057 A1 WO 1989000057A1 AU 8800230 W AU8800230 W AU 8800230W WO 8900057 A1 WO8900057 A1 WO 8900057A1
Authority
WO
WIPO (PCT)
Prior art keywords
plunger
barrel
syringe
groove
projection
Prior art date
Application number
PCT/AU1988/000230
Other languages
French (fr)
Inventor
Robert John Charles Foster
Original Assignee
Robert John Charles Foster
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 Robert John Charles Foster filed Critical Robert John Charles Foster
Publication of WO1989000057A1 publication Critical patent/WO1989000057A1/en

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
    • A61M5/50—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
    • 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
    • A61M5/5013—Means for blocking the piston or the fluid passageway to prevent illegal refilling of a syringe
    • A61M5/502—Means for blocking the piston or the fluid passageway to prevent illegal refilling of a syringe for blocking the piston

Definitions

  • This invention relates to syringes and more particularly to medical syringes which can only be used once.
  • Medical syringes comprise a cylindrical barrel and a plunger with a cylindrical base made of resiliant material located in sealing relation within the barrel and a needle mounted at the base of and in communication with the barrel.
  • the barrel was made of glass and the syringe was designed for multiple use with either the needle or the whole syringe being subjected to sterilisation between uses.
  • the syringes most used in medicine now are plastic disposables.
  • This invention comprises a syringe having a cylindrical barrel and inside the barrel a cylindrical plunger with a resiliant base in sealing relation with the barrel, the plunger having at least one circumferential groove and the barrel having an inwardly extending circumferential projection at its aperture such that the projection engages the groove to prevent withdrawal of the plunger.
  • the plunger has one groove located so that engagement with the projection on the barrel occurs when the plunger is pressed home fully and a second groove located between the first groove and the base so that engagement with the projection occurs before the plunger is pressed home fully.
  • Figure 1 is a perspective view of a syringe with part of the barrel cut away.
  • the syringe 1 consists of a barrel 2 having a needle assembly 3, including a non-removable needle 4 at its end 5.
  • the other end 6 of the barrel 2 has an oblong flange 7 serving as a finger support around aperture 8.
  • a cylindrical plunger 9 with a base 10 made of resilient material in air-tight relation with the inner barrel wall 2a such that withdrawl of the plunger 9 will result in the inward suction of liquid through the needle 4.
  • Plunger 9 is provided with two annular grooves 13a and 13b adjacent to its outer end and the inner wall 2a of barrel 2 has an annular barb 11 located adjacent to its outer extremity.
  • Plunger 9 is further provided at its outer end with a flange 20 adapted to sit within a recess 7a of flange 7 when the base 10 bottoms on end 5 of the barrel.
  • the syringe is supplied to the user with the plunger 9 partially withdrawn so that groove 13b is just outside the barrel 2.
  • the user fills the syringe 1 by withdrawing the plunger 9 to the full extent of the barrel while the needle is inserted in the liquid to be injected.
  • the barrel has a portion 12a which is additional to the measured dose and greater than the travel of the plunger between grooves 13a and 13b. This allows the full measured dose viz. 10 mis to be drawn into the syringe without the groove 13b passing into engagement with the barb 11 of the barrel.
  • the syringe is asperated by pushing the plunger 9 until the base 10 is level with the dosage mark required and then the liquid injected by pushing the plunger home. After groove 13b passes barb 11 it will be impossible to withdraw the plunger because of the locking engagement of the barb in the groove for the reverse direction of motion.
  • the barrel can be extended and the groove 13b can be located so that this engagement occurs when between 50% and 90% of the dose has been injected.
  • engagement occurs when 70% of the dose has been injected. Accordingly it is not possble to inject more than 70% of the dose and still reuse the syringe.

Abstract

The syringe comprises a cylindrical barrel (2) and inside the barrel (2) a cylindrical plunger (9) with a resilient base (10) in sealing relation with the barrel (2), the plunger (9) having at least one circumferential groove (13a) and the barrel having an inwardly extending circumferential projection (11) around its aperture (8) such that the projection (11) engages the groove (13a) to prevent withdrawal of the plunger (9).

Description

SINGLE FILL & USE SYRINGE
TECHNICAL FIELD
This invention relates to syringes and more particularly to medical syringes which can only be used once. BACKGROUND ART
Medical syringes comprise a cylindrical barrel and a plunger with a cylindrical base made of resiliant material located in sealing relation within the barrel and a needle mounted at the base of and in communication with the barrel.
Originally the barrel was made of glass and the syringe was designed for multiple use with either the needle or the whole syringe being subjected to sterilisation between uses. However, for convenience and in order to minimize cross infection, the syringes most used in medicine now are plastic disposables.
Although relatively cheap and disposable, these syringes can be reused and usually are by drug users amongst whom the spread of Aquired Immune Deficiency Syndrome (AIDS) is on the increase because of the sharing of syringes.
Many prior art syringes have been designed in an attempt to prevent reuse. Some use complicated mechanisms to prevent withdrawal of the plunger; these are difficult to manufacture and greatly increase the cost over the plastic disposable. Others use techniques in which the plunger collapses or the seal between the plunger and the barrel is broken, which prevents suction. None of these have proved to be reliable and afordable and although medically desirable have not been successful. DISCLOSURE OF INVENTION
It is an object of the present invention to provide a syringe which is as cheap to manufacture as the standard plastic disposable syringe but which cannot conveniently be reused after it is filled and used once. This invention comprises a syringe having a cylindrical barrel and inside the barrel a cylindrical plunger with a resiliant base in sealing relation with the barrel, the plunger having at least one circumferential groove and the barrel having an inwardly extending circumferential projection at its aperture such that the projection engages the groove to prevent withdrawal of the plunger.
In a preferred form of the syringe of this invention the plunger has one groove located so that engagement with the projection on the barrel occurs when the plunger is pressed home fully and a second groove located between the first groove and the base so that engagement with the projection occurs before the plunger is pressed home fully. BRIEF DESCRIPTION OF THE DRAWINGS
Following is a description of a preferred embodiment of the invention with reference to the drawings in which Figure 1 is a perspective view of a syringe with part of the barrel cut away. BEST MODE FOR CARRYING OUT THE INVENTION
The syringe 1 consists of a barrel 2 having a needle assembly 3, including a non-removable needle 4 at its end 5. The other end 6 of the barrel 2 has an oblong flange 7 serving as a finger support around aperture 8.
Extending through aperture 8 is a cylindrical plunger 9 with a base 10 made of resilient material in air-tight relation with the inner barrel wall 2a such that withdrawl of the plunger 9 will result in the inward suction of liquid through the needle 4. Plunger 9 is provided with two annular grooves 13a and 13b adjacent to its outer end and the inner wall 2a of barrel 2 has an annular barb 11 located adjacent to its outer extremity. Plunger 9 is further provided at its outer end with a flange 20 adapted to sit within a recess 7a of flange 7 when the base 10 bottoms on end 5 of the barrel. The syringe is supplied to the user with the plunger 9 partially withdrawn so that groove 13b is just outside the barrel 2. The user fills the syringe 1 by withdrawing the plunger 9 to the full extent of the barrel while the needle is inserted in the liquid to be injected.
The barrel has a portion 12a which is additional to the measured dose and greater than the travel of the plunger between grooves 13a and 13b. This allows the full measured dose viz. 10 mis to be drawn into the syringe without the groove 13b passing into engagement with the barb 11 of the barrel.
The syringe is asperated by pushing the plunger 9 until the base 10 is level with the dosage mark required and then the liquid injected by pushing the plunger home. After groove 13b passes barb 11 it will be impossible to withdraw the plunger because of the locking engagement of the barb in the groove for the reverse direction of motion.
The barrel can be extended and the groove 13b can be located so that this engagement occurs when between 50% and 90% of the dose has been injected. Preferably, engagement occurs when 70% of the dose has been injected. Accordingly it is not possble to inject more than 70% of the dose and still reuse the syringe.
Further, when the plunger (9) is pushed home fully, the flange 20 sits within the recess 7a of flange 7. In this position it is difficult to obtain purchase on the plunger in an attempt to force withdrawl from its locking engagement with the barrel.

Claims

CLAIMS :
1. A syringe (1) having a cylindrical barrel (2) and inside the barrel (2) a cylindrical plunger (9) with a resiliant base (10) in sealing relation with the barrel (2), the plunger (9) having at least one circumferential groove (13a) and the barrel having an inwardly extending circumferential projection (11) around its aperture (8) such that the projection (11) engages the groove (13a) to prevent withdrawl of the plunger (9).
2. The syringe of claim 1 in which one groove (13a) engages projection (11) when the plunger (9) is pressed home fully.
3. The syringe of claim 2 which has a second groove (13b) which engages projection (11) before the plunger (9) is pressed home and in which the barrel (2) has a portion (12a) which is additional to a measured dose and greater than the travel of the plunger (9) between grooves (13a) and (13b).
4. The syringe of claim 3 in which the travel of the plunger (9) between grooves (13a) and (13b) is equivalent to 30% of the measured dose.
5. A syringe as hereinbefore described with reference to the accompanying drawings.
PCT/AU1988/000230 1987-07-02 1988-06-30 Single fill and use syringe WO1989000057A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPI2840 1987-07-02
AU284087 1987-07-02

Publications (1)

Publication Number Publication Date
WO1989000057A1 true WO1989000057A1 (en) 1989-01-12

Family

ID=3693335

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1988/000230 WO1989000057A1 (en) 1987-07-02 1988-06-30 Single fill and use syringe

Country Status (1)

Country Link
WO (1) WO1989000057A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5222945A (en) * 1992-10-13 1993-06-29 Basnight Robert W Hypodermic syringe with protective shield
WO2006024232A1 (en) * 2004-09-03 2006-03-09 Chaoxiong Chen Self-destructing syringe
WO2008084124A1 (en) 2007-01-09 2008-07-17 Gramage Pina Lourdes Single-use syringe

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB580185A (en) * 1944-06-05 1946-08-29 Norman Phethean Improvements in or relating to hypodermic syringes
FR2181580A1 (en) * 1972-04-28 1973-12-07 Stampfli Jackie Disposable syringe - with device for preventing its re-use
FR2204429A1 (en) * 1972-11-01 1974-05-24 Chiquiar Marcelo
US4391272A (en) * 1978-03-10 1983-07-05 Tulcea, S.A. Disposable syringe

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB580185A (en) * 1944-06-05 1946-08-29 Norman Phethean Improvements in or relating to hypodermic syringes
FR2181580A1 (en) * 1972-04-28 1973-12-07 Stampfli Jackie Disposable syringe - with device for preventing its re-use
FR2204429A1 (en) * 1972-11-01 1974-05-24 Chiquiar Marcelo
US4391272A (en) * 1978-03-10 1983-07-05 Tulcea, S.A. Disposable syringe

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5222945A (en) * 1992-10-13 1993-06-29 Basnight Robert W Hypodermic syringe with protective shield
WO2006024232A1 (en) * 2004-09-03 2006-03-09 Chaoxiong Chen Self-destructing syringe
WO2008084124A1 (en) 2007-01-09 2008-07-17 Gramage Pina Lourdes Single-use syringe

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