GB2197792A - Disposable syringes - Google Patents

Disposable syringes Download PDF

Info

Publication number
GB2197792A
GB2197792A GB8628219A GB8628219A GB2197792A GB 2197792 A GB2197792 A GB 2197792A GB 8628219 A GB8628219 A GB 8628219A GB 8628219 A GB8628219 A GB 8628219A GB 2197792 A GB2197792 A GB 2197792A
Authority
GB
Grant status
Application
Patent type
Prior art keywords
end
piston
barrel
rod
syringe
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.)
Withdrawn
Application number
GB8628219A
Other versions
GB8628219D0 (en )
Inventor
John David Yair
Original Assignee
Power Richard Kiteley
John David Yair
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

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/50Devices 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
    • A61M5/5013Means for blocking the piston or the fluid passageway to prevent illegal refilling of a syringe
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/50Devices 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
    • A61M5/5013Means for blocking the piston or the fluid passageway to prevent illegal refilling of a syringe
    • A61M5/502Means for blocking the piston or the fluid passageway to prevent illegal refilling of a syringe for blocking the piston

Abstract

A hypodermic syringe has the total length of the piston and piston rod less than the total length of the barrel so that when an injection has been made and the contents of the barrel discharged, the head on the piston rod is received completely within the open end of the barrel making it difficult or impossible to withdraw the piston rod for a second operating cycle.

Description

DISPOSABLE SYRINGES This invention relates to disposable hypodermic syringes.

It is well known that the re-use of hypodermic syringes carries with it the risk of infection and contamination. Many previous designs of disposable syringe have attempted to ensure that the syringe can only be used once, in various different ways.

These proposals have led to complicated designs which are expensive to manufacture. In some cases the syringe had to be pre-filled which is not convenient for ordinary hospital use where the syringe may be required for many different purposes.

The object of the invention is to solve this problem by providing a once-only syringe which is particularly simple to manufacture.

In accordance with the invention a disposable syringe comprises a barrel provided with a needle or adapted for connection to a needle at one end, and having an opposite open end: a piston and piston rod located in the barrel and extending through the open end: and characterised in that the overall length of the piston and piston rod is less than the length of the barrel whereby, in normal operation, the piston rod is displaced within the barrel so as to be completed received in the barrel at the conclusion of an injection stroke.

Preferably the barrel has an enlarged diameter portion at the open end, and the piston rod is enlarged at the end opposite to the piston so as to afford an enlarged head for contact for example by the thumb of a user whose fingers engage behind lateral projections from the barrel.

Preferably the enlarged head includes tapering portions extending between the end face and the piston rod per se, so that if the piston rod is not centered in the barrel there is a reduced possibility of the outer end engaging the free end edge of the barrel.

Preferably also the extreme end surface, Lhich is to be engaged for example by the thumb of a user, is slightly domed.

If desired, cooperating pawl and ratchet means m a y b e p 0 \i I e d between the piston rcd and the end cf the barrel so that once the end of the rod has travel leo into the end of the barrel, it is engaged and held in that position.

The invention is more particularly described with reference to the accompanying drawing in which:- Figure 1 is a perspective view showing the syringe of the present invention; Figure 2 is an elevation of the same showing the parts In position ready for use; Figure 3 is a further elevation showing the syringe after use; and Figure 4 is a fragmentary sectional elevation on an enlarged scale showing a modification.

Turning now to the drawings, the syringe comprises a barrel 10 which may be of circular cross section and uniform diameter over a substantial part of its length, and integral with transversely extending lugs 12. Between the lugs 12 and the free end, the barrel is of larger diameter at 14, having an open end at this part. The opposite end is provided with a needle 16, or may be adapted to be connected to a needle in that position.

The length and diameter of the barrel portion 1C dependent upon the volume to be dealt with in a single ordinary use of the needle.

The syringe further comprises a piston 16 carried on the end of a piston rod 18 which may be of cruciform section. The piston rod is integral with a head 20 which, as best seen in Figure 2, may be convexly domed at 22. The diameter of the head 20 is such as to be a sliding fit in the enlarged diameter portion 14 at the free end of the barrel.

The portion of the piston rod immediately adjacent the head 20 is tapered at 24 so as to guide and centralise the piston rod as the head moves toward the free end of the enlarged portion 14.

The characteristic feature of the present invention is that the overall length of the piston, piston rod and its head L1, is less than the total internal length L2 of the barrel portions 10 and 14.

The syringe of the invention may be delivered, ready for use, essentially in the Figure 2 condition; although the needle end may be kept in a sterile condition by a push-on cap (not shown) and the opposite end protected by a cap 26 which is a push-on fit on the enlarged diameter portion 15 and which prevents the end 22 being pushed in from the Figure 2 position to the Figure 3 position. There is thus a portion of the end 22 exposed, as in Figure 2, when the cap is removed so that the needle can be fillet or part filled by displacing the piston 16 along the barrel towards the end 14, by holding the parts 12 for example between finger and thumb of one hand and drawing the piston rod outwardly by finger and thumb engaged with the end 2L.

Subsequently, and after displacing any air from the barrel, the injection is made in the usual way by, for example, engaging two fingers behind the projections 12 and displacing the end 22 by means of the thumb of the same hand. At the conclusion of the injection, the head 22 enters the enlarged portion 14 as in Figure 3 and the head is then inaccessible.

It will be appreciated that the length of the barrel and the length of the rod need to be accurately controlled so that in the Figure 3 position substantially the entire contents of the barrel will have been expressed.

If any attempt is made to reuse the syringe, it is at least very difficult to get the head 22 out of the enlarged portion 14. The head is to be a close a fit as possible in the portion 14 to prevent a pin being used as a lever to extract the head. The domed end also assists by displacing the maximum diameter portion of the head into the enlarged portion 14.

However, Figure 4 shows a modification in which prising the head out of the enlarged diameter portion is rendered even more difficult. This is achieved by providing a projection 40 inside the enlarged diameter portion 14, which may be a peripheral rib. The enlarged diameter portion of the piston rod is made with a series of finger-like projections or pawls 42 which are an interference fit with the rib. In other words, as the piston rod is displaced in use, the pawls encounter the rib and flex towards the longitudinal axis of the piston rod and then snap-engage behind the rib when the movement is completed. However the same flexing does not naturally occur in any attempted reverse movement.

The foregoing description refers to enlarged diameter portion 14, but it will be appreciated that the portion 14 could be of the same diameter as the remainder of the barrel, providing the dimensions of the piston rod are such that the whole of it can be wholly received within the barrel at the completion of the injection stroke.

Claims (6)

1. A disposable syringe comprising a barrel provided with a needle or adapted for connection to a needle at one end, and having an opposite open end: a piston and piston rod located in the barrel and extending through the open end: and characterised in that the overall length of the piston and piston rod is less than the length of the barrel whereby, in normal operation, the piston rod is displaced within the barrel so as to be completed received in the barrel at the conclusion of an injection stroke.
2. A syringe as claimed in Claim 1 wherein the barrel has an enlarged diameter portion at the open end, and the piston rod is enlarged at the end opposite to the piston so as to afford an enlarged head for contact for example by the thumb of a user whose fingers engage behind lateral projections from the barrel.
3. A syringe as claimed in Claim 2 wherein the enlarged head includes tapering portions extending between the end face and the piston rod per se, so that if the piston rod is not centered in the barrel there is a reduced possibility of the outer end engaging the free end edge of the barrel.
4. A syringe as claimed in any preceding claim wherein the extreme end surface which is to be engaged for example by the thumb of a user, is slightly domed.
5. A syringe as claimed in any preceding claim wherein co-operating pawl and ratchet means are provided between the piston rod and the end of the barrel so that once the end of the rod has travelled into the end of the barrel, it is engaged and held in that position.
6. A syringe substantially as described with reference to Figures 1-3 or Figure 4 of the accompanying drawings.
GB8628219A 1986-11-26 1986-11-26 Disposable syringes Withdrawn GB8628219D0 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8628219A GB8628219D0 (en) 1986-11-26 1986-11-26 Disposable syringes

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8628219A GB8628219D0 (en) 1986-11-26 1986-11-26 Disposable syringes
GB8710995A GB8710995D0 (en) 1986-11-26 1987-05-08 Disposable syringes

Publications (2)

Publication Number Publication Date
GB8628219D0 GB8628219D0 (en) 1986-12-31
GB2197792A true true GB2197792A (en) 1988-06-02

Family

ID=10607946

Family Applications (2)

Application Number Title Priority Date Filing Date
GB8628219A Withdrawn GB8628219D0 (en) 1986-11-26 1986-11-26 Disposable syringes
GB8710995A Pending GB8710995D0 (en) 1986-11-26 1987-05-08 Disposable syringes

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB8710995A Pending GB8710995D0 (en) 1986-11-26 1987-05-08 Disposable syringes

Country Status (1)

Country Link
GB (2) GB8628219D0 (en)

Cited By (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990006785A1 (en) * 1988-12-14 1990-06-28 Gudmar Olovson A syringe
EP0406655A1 (en) * 1989-07-05 1991-01-09 GI.BI.EFFE S.r.l. Disposable syringe for once-only use
US4990141A (en) * 1988-01-15 1991-02-05 National Research Development Corporation Single-use syringe
EP0413414A1 (en) * 1989-08-14 1991-02-20 Chien-Hua Tsao Safety hypodermic syringe
US5067947A (en) * 1989-07-18 1991-11-26 Tri/West Systems, Inc. Syringe plunger rod mount
EP0467173A1 (en) * 1990-07-19 1992-01-22 Nardino Righi Disposable safety syringe
WO1992005818A1 (en) * 1990-10-03 1992-04-16 Triad Technology Safety syringe with retractable needle
US5114405A (en) * 1990-05-21 1992-05-19 Winter Douglas A Single use tamper resistant syringe
FR2686517A1 (en) * 1992-01-27 1993-07-30 Lardenois Robert Single-use syringe
US5232447A (en) * 1991-08-08 1993-08-03 Jetfill, Inc. Non-reusable syringe
US5259840A (en) * 1991-09-03 1993-11-09 Boris Craig R Locking syringe
US5269760A (en) * 1991-11-14 1993-12-14 Bina Dale C Non-reusable hypodermic syringe
US5304138A (en) * 1992-09-18 1994-04-19 Advanced Safety Technology Single use, destructible medical syringe
EP0618818A1 (en) * 1991-12-23 1994-10-12 PRESSLY, William B. S. Safety syringe
US5578011A (en) * 1995-05-11 1996-11-26 Shaw; Thomas J. Tamperproof retractable syringe
US5613952A (en) * 1991-12-23 1997-03-25 Syringe Develpoment Partners Safety syringe
US5624408A (en) * 1992-08-25 1997-04-29 Dille Safe Ab Syringe
US5632733A (en) * 1995-05-11 1997-05-27 Shaw; Thomas J. Tamperproof retractable syringe
EP0962230A2 (en) * 1990-11-07 1999-12-08 MDC Investment Holdings, Inc. Needle device, particularly hypodermic needle
US6010486A (en) * 1998-12-18 2000-01-04 Becton Dickinson And Company Retracting needle syringe
US6036674A (en) * 1998-12-18 2000-03-14 Becton Dickinson And Company Retracting needle syringe
US6090077A (en) * 1995-05-11 2000-07-18 Shaw; Thomas J. Syringe plunger assembly and barrel
US6221052B1 (en) 1998-12-18 2001-04-24 Becton, Dickinson And Company Retracting needle syringe
EP1106194A1 (en) * 1999-12-03 2001-06-13 Euro-China Farma, S.L. Single-use disposable syringe
US6361524B1 (en) 1998-04-14 2002-03-26 Becton, Dickinson And Company Syringe assembly
US6368303B1 (en) 1999-10-15 2002-04-09 Becton, Dickinson And Company Retracting needle syringe
US6517516B1 (en) 1999-10-15 2003-02-11 Becton Dickinson And Company Method of making a retracting needle syringe
US6524278B1 (en) 1998-09-04 2003-02-25 Nmt Group Plc Needle sheath
US6572584B1 (en) 2000-08-07 2003-06-03 Retractable Technologies, Inc. Retractable syringe with reduced retraction force
US6840291B2 (en) 1999-10-15 2005-01-11 Becton Dickinson And Company Attachment for a medical device
US7331942B2 (en) 2003-09-23 2008-02-19 Becton, Dickinson And Company Flush syringe having anti-reflux stopper
WO2008154630A3 (en) * 2007-06-12 2009-04-02 Becton Dickinson Co Syringe with disabling mechanism
US7972302B2 (en) 2007-06-12 2011-07-05 Becton, Dickinson And Company Syringe with disabling mechanism
US8361018B2 (en) 2007-06-12 2013-01-29 Becton, Dickinson And Company Syringe with disabling mechanism
US9522237B2 (en) 2005-01-07 2016-12-20 Becton, Dickinson And Company Positive displacement flush syringe

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB879296A (en) * 1958-01-09 1961-10-11 Fritz Kuehn Improvements in and relating to hypodermic syringes
GB1087360A (en) * 1964-06-16 1967-10-18 Haustrups Fabriker As Disposable hypodermic syringe

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB879296A (en) * 1958-01-09 1961-10-11 Fritz Kuehn Improvements in and relating to hypodermic syringes
GB1087360A (en) * 1964-06-16 1967-10-18 Haustrups Fabriker As Disposable hypodermic syringe

Cited By (60)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4990141A (en) * 1988-01-15 1991-02-05 National Research Development Corporation Single-use syringe
WO1990006785A1 (en) * 1988-12-14 1990-06-28 Gudmar Olovson A syringe
US5141495A (en) * 1988-12-14 1992-08-25 Gudmar Olovson Syringe
US5116320A (en) * 1989-07-05 1992-05-26 Gi.Bi.Effe S.R.L. Disposable syringe for once-only use
EP0406655A1 (en) * 1989-07-05 1991-01-09 GI.BI.EFFE S.r.l. Disposable syringe for once-only use
US5067947A (en) * 1989-07-18 1991-11-26 Tri/West Systems, Inc. Syringe plunger rod mount
EP0483227A4 (en) * 1989-07-18 1992-06-24 Tri/West Systems, Inc. Syringe plunger rod mount
EP0483227A1 (en) * 1989-07-18 1992-05-06 Tri/West Systems, Inc. Syringe plunger rod mount
US5490842A (en) * 1989-07-18 1996-02-13 Tri/West Systems, Inc. Syringe plunger rod mount
EP0413414A1 (en) * 1989-08-14 1991-02-20 Chien-Hua Tsao Safety hypodermic syringe
US5114405A (en) * 1990-05-21 1992-05-19 Winter Douglas A Single use tamper resistant syringe
EP0467173A1 (en) * 1990-07-19 1992-01-22 Nardino Righi Disposable safety syringe
WO1992005818A1 (en) * 1990-10-03 1992-04-16 Triad Technology Safety syringe with retractable needle
EP0962230A2 (en) * 1990-11-07 1999-12-08 MDC Investment Holdings, Inc. Needle device, particularly hypodermic needle
EP0962230A3 (en) * 1990-11-07 2000-01-05 MDC Investment Holdings, Inc. Needle device, particularly hypodermic needle
US5232447A (en) * 1991-08-08 1993-08-03 Jetfill, Inc. Non-reusable syringe
US5259840A (en) * 1991-09-03 1993-11-09 Boris Craig R Locking syringe
US5269760A (en) * 1991-11-14 1993-12-14 Bina Dale C Non-reusable hypodermic syringe
US5613952A (en) * 1991-12-23 1997-03-25 Syringe Develpoment Partners Safety syringe
EP0618818A1 (en) * 1991-12-23 1994-10-12 PRESSLY, William B. S. Safety syringe
EP0618818A4 (en) * 1991-12-23 1995-05-24 William B S Pressly Safety syringe.
US6074370A (en) * 1991-12-23 2000-06-13 Syringe Development Partners L.L.C. Safety syringe
US6605073B1 (en) 1991-12-23 2003-08-12 Medsafe Technologies, Llc Safety syringe
US5800403A (en) * 1991-12-23 1998-09-01 Syringe Development Partners L.L.C. Safety syringe
FR2686517A1 (en) * 1992-01-27 1993-07-30 Lardenois Robert Single-use syringe
US5624408A (en) * 1992-08-25 1997-04-29 Dille Safe Ab Syringe
US5304138A (en) * 1992-09-18 1994-04-19 Advanced Safety Technology Single use, destructible medical syringe
EP0900096A1 (en) * 1995-05-11 1999-03-10 SHAW, Thomas J. Tamperproof retractable syringe
EP1358900A3 (en) * 1995-05-11 2003-11-12 SHAW, Thomas J. Tamperproof retractable syringe
EP0900096A4 (en) * 1995-05-11 1999-03-10
US5632733A (en) * 1995-05-11 1997-05-27 Shaw; Thomas J. Tamperproof retractable syringe
US5578011A (en) * 1995-05-11 1996-11-26 Shaw; Thomas J. Tamperproof retractable syringe
US6090077A (en) * 1995-05-11 2000-07-18 Shaw; Thomas J. Syringe plunger assembly and barrel
US8632521B2 (en) 1998-04-14 2014-01-21 Becton, Dickinson And Company Syringe assembly
US7682342B2 (en) 1998-04-14 2010-03-23 Becton Dickinson And Company Syringe assembly
US6361524B1 (en) 1998-04-14 2002-03-26 Becton, Dickinson And Company Syringe assembly
US6743216B2 (en) 1998-04-14 2004-06-01 Becton Dickinson And Company Syringe assembly
US7935103B2 (en) 1998-04-14 2011-05-03 Becton, Dickinson And Company Syringe assembly
US8226616B2 (en) 1998-04-14 2012-07-24 Becton, Dickinson And Company Syringe assembly
US6524278B1 (en) 1998-09-04 2003-02-25 Nmt Group Plc Needle sheath
US6221052B1 (en) 1998-12-18 2001-04-24 Becton, Dickinson And Company Retracting needle syringe
US6010486A (en) * 1998-12-18 2000-01-04 Becton Dickinson And Company Retracting needle syringe
US6036674A (en) * 1998-12-18 2000-03-14 Becton Dickinson And Company Retracting needle syringe
US6632198B2 (en) 1999-10-15 2003-10-14 Becton Dickinson And Company Retracting needle syringe
US6840291B2 (en) 1999-10-15 2005-01-11 Becton Dickinson And Company Attachment for a medical device
US6368303B1 (en) 1999-10-15 2002-04-09 Becton, Dickinson And Company Retracting needle syringe
US6517516B1 (en) 1999-10-15 2003-02-11 Becton Dickinson And Company Method of making a retracting needle syringe
EP1106194A1 (en) * 1999-12-03 2001-06-13 Euro-China Farma, S.L. Single-use disposable syringe
US6572584B1 (en) 2000-08-07 2003-06-03 Retractable Technologies, Inc. Retractable syringe with reduced retraction force
US7331942B2 (en) 2003-09-23 2008-02-19 Becton, Dickinson And Company Flush syringe having anti-reflux stopper
US9522237B2 (en) 2005-01-07 2016-12-20 Becton, Dickinson And Company Positive displacement flush syringe
US7972302B2 (en) 2007-06-12 2011-07-05 Becton, Dickinson And Company Syringe with disabling mechanism
JP2010529892A (en) * 2007-06-12 2010-09-02 ベクトン・ディキンソン・アンド・カンパニーBecton, Dickinson And Company Disabling mechanism with syringe
WO2008154630A3 (en) * 2007-06-12 2009-04-02 Becton Dickinson Co Syringe with disabling mechanism
CN101808686B (en) 2007-06-12 2012-11-28 贝克顿·迪金森公司 Syringe with disabling mechanism
US8361018B2 (en) 2007-06-12 2013-01-29 Becton, Dickinson And Company Syringe with disabling mechanism
US7972304B2 (en) 2007-06-12 2011-07-05 Becton, Dickinson And Company Syringe with disabling mechanism
US8920371B2 (en) 2007-06-12 2014-12-30 Becton, Dickinson And Company Syringe with disabling mechanism
EP2929901A1 (en) * 2007-06-12 2015-10-14 Becton Dickinson and Company Syringe with disabling mechanism
US7972303B2 (en) * 2007-06-12 2011-07-05 Becton, Dickinson And Company Syringe with disabling mechanism

Also Published As

Publication number Publication date Type
GB8628219D0 (en) 1986-12-31 grant
GB8710995D0 (en) 1987-06-10 grant

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)