WO1998034659A1 - Self-destructing hypodermic syringe - Google Patents

Self-destructing hypodermic syringe Download PDF

Info

Publication number
WO1998034659A1
WO1998034659A1 PCT/NO1998/000042 NO9800042W WO9834659A1 WO 1998034659 A1 WO1998034659 A1 WO 1998034659A1 NO 9800042 W NO9800042 W NO 9800042W WO 9834659 A1 WO9834659 A1 WO 9834659A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
syringe
extension
holder
plunger
Prior art date
Application number
PCT/NO1998/000042
Other languages
French (fr)
Inventor
As Lifecare
Original Assignee
Ellingsen, Olav
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 Ellingsen, Olav filed Critical Ellingsen, Olav
Priority to AU60069/98A priority Critical patent/AU6006998A/en
Publication of WO1998034659A1 publication Critical patent/WO1998034659A1/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
    • A61M5/178—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    • A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston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

Definitions

  • the present invention relates to a so-called disposable hypodermic syringe or a self- destructing hypodermic syringe, of the type which comprises a syringe housing, a plunger with plunger rod and plunger head with associated seal, and an injection needle.
  • the syringe is of the type that is destroyed during use, and which can be disposed of without any problems as the syringe needle is retracted into the syringe housing on destruction.
  • hypodermic syringes are unfortunately used extensively and repeatedly by "mainliners”, addicts who take drugs by injection, and it is in connection with this category of users that major problems have arisen with the reuse of syringes and even of so-called conventional disposable syringes.
  • the object of the present invention is to make a contribution to an improved situation, and accordingly it relates to a self-destructing disposable syringe comprising a syringe housing, a plunger with plunger rod and plunger head with seal, and an injection needle, and this syringe is characterised by - an extension running from the external end wall of the housing and equipped with inwardly bendable flaps; a holder located centrally in the housing having a central bore and having a flange formed at the end facing the plunger head having a liquid-tight seal against the liquid chamber of the housing; and having - a wholly or partly tapered part extending inside the flapped extension of the housing and having an end bead with an inverted collar for interaction with and retention of the inwardly bent flaps on the extension of the housing; having an injection needle running through the bore of the holder, an end sleeve which is coaxial with and
  • the syringe of the invention is based on the principle that locking means are released the instant the syringe is emptied of its contents on injection so that the whole element holding the hypodermic needle is retracted into the syringe housing without later being capable of being locked in a forward position.
  • Figure 1 shows a syringe ready for use and where two different possibilities are indicated for retraction of the needle
  • Figure 2 shows a syringe containing aspirated injection liquid immediately prior to injection
  • - Figure 3 shows the situation after the injection has been completed, where the syringe is empty and the locking means have been released
  • Figure 4 shows the empty, destroyed syringe with retracted injection needle
  • Figure 5 shows an alternative embodiment having chemical means for driving back the needle holder
  • Figure 5a shows an alternative embodiment with a sealing ring 24 disposed around the needle holder 8
  • Figure 5b shows schematically the flaps 6 on the extension 7.
  • Figure 6 corresponds to Fig. 4.
  • Figure 1 shows a syringe having syringe housing 1 , plunger with plunger rod 2 and plunger head 3 with seal 3 ' and having an injection needle 4.
  • An injection needle holder 8 having a central bore 9 for the injection needle is provided in the distal end of the syringe.
  • this holder is equipped with a flange 10 having a liquid seal 11 against the liquid chamber 12 of the housing 1.
  • This flange that is the surface facing the liquid chamber, serves as effective bottom of the syringe.
  • the holder is equipped with a conical tapered part 15 which moves into the extension 7 of the housing 1.
  • the flaps 6 of the extension 7 are bent inwards in intimate contact with the conical tapered part 15, and the flaps are locked in the inwardly bent position by means of a locking groove under an inverted collar 17 on an end bead 16 on the cone 15. It can be noted from Figure 1 that there is a small space between the distal end of the end bead 16 and the internal surface of the end wall of the end sleeve 22, a fact which is of great importance as will be explained below.
  • Fig. 1 The position shown in Fig. 1 is the starting position for the use of the syringe.
  • the syringe needle is inserted into a capped phial and injection liquid is aspirated into the liquid chamber 12 of the syringe as indicated in Fig. 2.
  • the holder with injection needle 4, and also with plunger head and plunger rod can be pressed into the syringe with the aid of suitable means.
  • these means are formed by a helical spring 18 which on one side rests against the flange 10 on the holder 8 and at the other end rests against the internal 19 surface of the end wall 5 of the housing.
  • the spring is preferably of such strength and size that the one shown in Fig. 4 in a safe manner pushes the holder 8 so far inside the housing that the injection needle 9 passes the end wall of the end sleeve 22, and allows the safety valve 23 to fall into place and prevent the needle 4 from being unintentionally pressed out again.
  • Figure 5 shows an alternative embodiment where the holder 8 in the housing 1 is equipped with a flange 10, and where between the flange 10 and the internal surface 19 of the end wall 5 of the housing a chemical propellant is provided as agent for retraction of the holder.
  • this agent is intended to be a layer of crystalline formic acid and calcium carbonate and/or another similar compound, which on the penetration of moisture emits CO 2 .
  • the retention of the holder 8 takes place in this case by means of two flaps 6, punched out in the extension 7, and pressed down in corresponding grooves which are milled or turned out on the holder 8.
  • Figure 5a shows an alternative embodiment with a sealing ring 24 disposed around the needle holder 8.
  • FIG. 5b shows schematically the flaps 6 on the extension 7.
  • Figure 6 shows the situation after the gas has pressed the holder 8 inside the housing and thus drawn the needle 4 into the extension 7.
  • the end extension 7 and the end sleeve 22 are made in one piece.
  • the invention is not limited to the retraction means of the illustrated embodiments, it is also conceivable that there may be used, for example, glass ampoules containing propellant gas under pressure and which are crushed after the injection has been completed.
  • a further safety feature is indicated in the present figures in that on the plunger head 3 a sleeve 20 is provided having ribs running along the periphery, intended for interaction with a bore 13 in the flange 10 on the holder 8, with corresponding ribs 14, and where the sleeve and recess engage when the injection is complete and the plunger head comes to rest against the surface of the flange (10) facing the liquid chamber.
  • the self-destructing disposable syringe of the application provides a safe and relatively simple aid for those who are dependent upon regular injections and who are capable of injecting themselves, as it is also ensured that the aid, the syringe according to the invention, can be disposed of in a non-dangerous manner without there being any risk of unintentional or illegal use since the syringe becomes useless after use.

Abstract

A self-destructing disposable syringe comprising a syringe housing (1), a plunger with plunger rod (2) and plunger head (3) with seal (3'), and an injection needle (4), an extension (7) running from the external end wall (5) of the housing (1) and equipped with inwardly bendable flaps (6); a holder (8) located centrally in the housing (1) having a central bore (9) and having a flange (10) formed at the end facing the plunger head (3) having a liquid-tight seal (11) against the liquid chamber (12) of the housing (1); and having a wholly or partly tapered part (15) extending inside the flapped extension (7) of the housing (1) and having an end bead (16) with an inverted collar (17) for interaction with and retention (21) of the inwardly bent flaps (20) on the extension (7) of the housing (1); having an injection needle (4) running through the bore (9) of the holder (8), an end sleeve (22) which is coaxial with and intimately surrounds the flapped extension (7), which extension and end sleeve can be made in one piece; and means (18, 13, 14, 20) for retracting the hypodermic needle (4) inside the syringe housing (1) after use.

Description

SELF-DESTRUCTING HYPODERMIC SYRINGE
The present invention relates to a so-called disposable hypodermic syringe or a self- destructing hypodermic syringe, of the type which comprises a syringe housing, a plunger with plunger rod and plunger head with associated seal, and an injection needle.
The syringe is of the type that is destroyed during use, and which can be disposed of without any problems as the syringe needle is retracted into the syringe housing on destruction.
There is an ever-growing market for disposable syringes, in particular because it is becoming more and more common for sick persons who regularly need injections, e.g., diabetics, to inject themselves.
However, hypodermic syringes are unfortunately used extensively and repeatedly by "mainliners", addicts who take drugs by injection, and it is in connection with this category of users that major problems have arisen with the reuse of syringes and even of so-called conventional disposable syringes.
There is therefore a growing need for inexpensive and simple, but nevertheless safe, self-destructing syringes, as a part of the battle against the spread of disease transmitted by blood because drug addicts in particular lend each other their syringes. Of these infectious diseases special mention can be made of hepatitis B and AIDS.
There are several self-destructing hypodermic syringes on the market which have some form of failure element, which is broken after the syringe has been used for the first time.
However, it has been found that the majority of the solutions proposed to date have been either too expensive to produce or unsafe to use since it has been possible to manipulate the syringe so as to render it reusable.
From the prior art in this field reference will be made to NO 163263 and to the relatively recent P960485. The object of the present invention is to make a contribution to an improved situation, and accordingly it relates to a self-destructing disposable syringe comprising a syringe housing, a plunger with plunger rod and plunger head with seal, and an injection needle, and this syringe is characterised by - an extension running from the external end wall of the housing and equipped with inwardly bendable flaps; a holder located centrally in the housing having a central bore and having a flange formed at the end facing the plunger head having a liquid-tight seal against the liquid chamber of the housing; and having - a wholly or partly tapered part extending inside the flapped extension of the housing and having an end bead with an inverted collar for interaction with and retention of the inwardly bent flaps on the extension of the housing; having an injection needle running through the bore of the holder, an end sleeve which is coaxial with and intimately surrounds the flapped extension, which extension and end sleeve can be made in one piece; and means for retracting the needle inside the syringe housing after use.
The syringe of the invention is based on the principle that locking means are released the instant the syringe is emptied of its contents on injection so that the whole element holding the hypodermic needle is retracted into the syringe housing without later being capable of being locked in a forward position.
The invention will now be described in more detail with reference to the appended drawings, wherein:
Figure 1 shows a syringe ready for use and where two different possibilities are indicated for retraction of the needle; Figure 2 shows a syringe containing aspirated injection liquid immediately prior to injection; - Figure 3 shows the situation after the injection has been completed, where the syringe is empty and the locking means have been released; Figure 4 shows the empty, destroyed syringe with retracted injection needle; Figure 5 shows an alternative embodiment having chemical means for driving back the needle holder; and
Figure 5a shows an alternative embodiment with a sealing ring 24 disposed around the needle holder 8, Figure 5b shows schematically the flaps 6 on the extension 7.
Figure 6 corresponds to Fig. 4.
Figure 1 shows a syringe having syringe housing 1 , plunger with plunger rod 2 and plunger head 3 with seal 3 ' and having an injection needle 4.
From the end wall 5 of the plunger housing 1 there projects an extension 7 made in the form of inwardly bendable flaps 6 as can better be seen from Fig. 4. This end extension 7 of the housing 1 is surrounded by an end sleeve 22, in the end wall of which a hole is made through which the injection needle 4 can pass. This hole may be equipped with an internal valve 23.
An injection needle holder 8 having a central bore 9 for the injection needle is provided in the distal end of the syringe. At the end facing the plunger head 3, this holder is equipped with a flange 10 having a liquid seal 11 against the liquid chamber 12 of the housing 1. This flange, that is the surface facing the liquid chamber, serves as effective bottom of the syringe. In the direction of the syringe end, the holder is equipped with a conical tapered part 15 which moves into the extension 7 of the housing 1. In use, the flaps 6 of the extension 7 are bent inwards in intimate contact with the conical tapered part 15, and the flaps are locked in the inwardly bent position by means of a locking groove under an inverted collar 17 on an end bead 16 on the cone 15. It can be noted from Figure 1 that there is a small space between the distal end of the end bead 16 and the internal surface of the end wall of the end sleeve 22, a fact which is of great importance as will be explained below.
The position shown in Fig. 1 is the starting position for the use of the syringe. The syringe needle is inserted into a capped phial and injection liquid is aspirated into the liquid chamber 12 of the syringe as indicated in Fig. 2.
When an injection is given, the syringe is emptied in that the plunger rod with plunger head 3 presses the injection liquid out through the injection needle 4 until the syringe is empty and the plunger head 3 with seal 3' comes into contact with the surface of the flange 10 of the holder 8 facing the liquid chamber. Immediately the injection is started, the liquid pressure in the liquid chamber 12 will press the holder 8 just so far down in the syringe that the flaps 6 on the extension 7 disengage from the collar 17 on the end bead 16. To allow this movement it is necessary to have a certain initial space between the end face of the holder and the internal wall of the end sleeve 22.
The instant the holder no longer holds the flaps 7 in place and is locked by these in its movement inside the syringe, the holder with injection needle 4, and also with plunger head and plunger rod, can be pressed into the syringe with the aid of suitable means.
In the illustrated embodiment these means are formed by a helical spring 18 which on one side rests against the flange 10 on the holder 8 and at the other end rests against the internal 19 surface of the end wall 5 of the housing.
The spring is preferably of such strength and size that the one shown in Fig. 4 in a safe manner pushes the holder 8 so far inside the housing that the injection needle 9 passes the end wall of the end sleeve 22, and allows the safety valve 23 to fall into place and prevent the needle 4 from being unintentionally pressed out again.
Figure 5 shows an alternative embodiment where the holder 8 in the housing 1 is equipped with a flange 10, and where between the flange 10 and the internal surface 19 of the end wall 5 of the housing a chemical propellant is provided as agent for retraction of the holder. In this case, this agent is intended to be a layer of crystalline formic acid and calcium carbonate and/or another similar compound, which on the penetration of moisture emits CO2.
The retention of the holder 8 takes place in this case by means of two flaps 6, punched out in the extension 7, and pressed down in corresponding grooves which are milled or turned out on the holder 8.
When a drug is injected by pressing the plunger rod 2 with plunger head 3 to the bottom of the housing 1 and against the flange 10 of the holder 8, some liquid will enter the chamber containing formic acid and carbonate, which in turn will result in the production of CO2. At the same time, the depression of the plunger, as described in connection with the embodiment according to Figs 1 to 4, will cause the flaps 6 to be released from the holder and the holder will then be capable of being pressed back inside the housing 1 owing to the gas pressure which builds up inside the space between the end wall 5 and the flange 10. To prevent undesirable and unintentional leakage a gasket is provided around the needle holder 8 as is indicated at 24.
Figure 5a shows an alternative embodiment with a sealing ring 24 disposed around the needle holder 8.
Figure 5b shows schematically the flaps 6 on the extension 7.
Figure 6 shows the situation after the gas has pressed the holder 8 inside the housing and thus drawn the needle 4 into the extension 7. In this embodiment the end extension 7 and the end sleeve 22 are made in one piece.
The invention is not limited to the retraction means of the illustrated embodiments, it is also conceivable that there may be used, for example, glass ampoules containing propellant gas under pressure and which are crushed after the injection has been completed.
Instead of the illustrated helical spring 18 a buffer spring or disc spring are also conceivable, and this would reduce the structural length.
Yet another possibility is the use of directional polymer plastic which expands on contact with liquid.
A further safety feature is indicated in the present figures in that on the plunger head 3 a sleeve 20 is provided having ribs running along the periphery, intended for interaction with a bore 13 in the flange 10 on the holder 8, with corresponding ribs 14, and where the sleeve and recess engage when the injection is complete and the plunger head comes to rest against the surface of the flange (10) facing the liquid chamber.
The self-destructing disposable syringe of the application provides a safe and relatively simple aid for those who are dependent upon regular injections and who are capable of injecting themselves, as it is also ensured that the aid, the syringe according to the invention, can be disposed of in a non-dangerous manner without there being any risk of unintentional or illegal use since the syringe becomes useless after use.
It should be pointed out here that of course a syringe is conceivable which must be rendered useless manually, for example, with the aid of the described means 13, 14 on the flange 10 of the holder 8 and the sleeve 20 on the plunger head, but without this being deemed beyond the scope of the invention. It is the self-destructing function as shown at spring 8, which is the essential feature of the invention and here reference is made also to the alternatives described above.

Claims

P a t e n t c l a i m s
1.
A self-destructing disposable syringe comprising a syringe housing (1), a plunger with plunger rod (2) and plunger head (3) with seal (3'), and an injection needle (4), characterised by an extension (7) running from the external end wall (5) of the housing (1) and equipped with inwardly bendable flaps (6); a holder (8) located centrally in the housing (1) having a central bore (9) and having a flange (10) formed at the end facing the plunger head (3) having a liquid-tight seal (11) against the liquid chamber (12) of the housing (1); and having a wholly or partly tapered part (15) extending inside the flapped extension (7) of the housing (1) and having an end bead (16) with an inverted collar (17) for interaction with and retention (21) of the inwardly bent flaps (20) on the extension (7) of the housing
(i); having an injection needle (4) running through the bore (9) of the holder (8), an end sleeve (22) which is coaxial with and intimately surrounds the flapped extension (7), which extension and end sleeve can be made in one piece; and means (18, 13, 14, 20) for retracting the hypodermic needle (4) inside the syringe housing (1) after use.
2.
A syringe according to Claim 1, characterised in that the retraction means consist of a return spring (18) which rests against the surface of the collar (10) on the holder (8) facing away from the liquid chamber and against the internal surface (19) of the end wall (5) of the syringe housing (1).
3. A syringe according to Claim 1 , characterised in that the retraction means consist of a chemical agent.
4.
A syringe according to Claim 3, characterised in that the chemical retraction agent is based on carbonate and formic acid.
5.
A syringe according to Claim 1, characterised in that the retraction means is a propellant gas contained in glass ampoules which are crushed.
6.
A syringe according to Claim 1 , characterised in that the retraction means is a directional polymeric plastic having directionally determined expansion.
7. A syringe according to any one of the preceding claims, characterised in that the retraction means additionally comprise, on the surface of the plunger head (3) facing the liquid chamber, a sleeve (20) having grooves and, in the surface of the flange (11) on the holder (8) facing the liquid chamber, a recess (13) interacting with the sleeve having corresponding grooves (14).
PCT/NO1998/000042 1997-02-07 1998-02-06 Self-destructing hypodermic syringe WO1998034659A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU60069/98A AU6006998A (en) 1997-02-07 1998-02-06 Self-destructing hypodermic syringe

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO970576A NO305106B1 (en) 1997-02-07 1997-02-07 Self-destruct injection syringe
NO970576970207 1997-02-07

Publications (1)

Publication Number Publication Date
WO1998034659A1 true WO1998034659A1 (en) 1998-08-13

Family

ID=19900361

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO1998/000042 WO1998034659A1 (en) 1997-02-07 1998-02-06 Self-destructing hypodermic syringe

Country Status (3)

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AU (1) AU6006998A (en)
NO (1) NO305106B1 (en)
WO (1) WO1998034659A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2831448A1 (en) * 2001-10-29 2003-05-02 Celine Denise Laval Triple-use injection syringe, without needle, with needle or with retractable needle, has detonator fitted in different positions
WO2003051435A1 (en) * 2001-12-18 2003-06-26 John Thomas Mcdonald Pneumatically retractable safety syringe
WO2010037759A1 (en) * 2008-10-01 2010-04-08 Shl Group Ab Medicament delivery device powered by volute spring
US8523810B2 (en) 2004-09-03 2013-09-03 L.O.M. Laboratories Inc. Single-use pneumatic safety syringe providing gas-driven needle retraction
US10195364B2 (en) 2014-03-26 2019-02-05 L.O.M. Laboratories Inc. Gas release cell
US10709847B2 (en) 2015-01-20 2020-07-14 L.O.M. Laboratories Inc. Retractable needle syringe with unitary propellant release module
US10765815B2 (en) 2014-10-31 2020-09-08 L.O.M. Laboratories Inc. Retractable needle syringe
CN113181481A (en) * 2021-04-30 2021-07-30 鹰潭荣嘉集团医疗器械实业有限公司 Disposable self-destruction syringe

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991004760A1 (en) * 1989-10-03 1991-04-18 Abraham Van Den Haak Injection syringe with automatically retractable needle
EP0596211A1 (en) * 1992-10-31 1994-05-11 Nihon Chemical Research Co. Ltd Syringe with automatic needle-withdrawal mechanism

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991004760A1 (en) * 1989-10-03 1991-04-18 Abraham Van Den Haak Injection syringe with automatically retractable needle
EP0596211A1 (en) * 1992-10-31 1994-05-11 Nihon Chemical Research Co. Ltd Syringe with automatic needle-withdrawal mechanism

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2831448A1 (en) * 2001-10-29 2003-05-02 Celine Denise Laval Triple-use injection syringe, without needle, with needle or with retractable needle, has detonator fitted in different positions
WO2003051435A1 (en) * 2001-12-18 2003-06-26 John Thomas Mcdonald Pneumatically retractable safety syringe
US9408983B2 (en) 2004-09-03 2016-08-09 L.O.M. Laboratories Inc. Single-use pneumatic safety syringe providing gas-driven needle retraction
US10335555B2 (en) 2004-09-03 2019-07-02 L.O.M. Laboratories Inc. Single-use pneumatic safety syringe providing gas-driven needle retraction
US8523810B2 (en) 2004-09-03 2013-09-03 L.O.M. Laboratories Inc. Single-use pneumatic safety syringe providing gas-driven needle retraction
US9649450B2 (en) 2004-09-03 2017-05-16 L.O.M. Laboratories Inc. Single use pneumatic safety syringe providing gas-driven needle retraction
US9192732B2 (en) 2004-09-03 2015-11-24 L.O.M. Laboratories Inc. Single use pneumatic safety syringe providing gas-driven needle retraction
AU2009299888B2 (en) * 2008-10-01 2012-07-05 Shl Group Ab Medicament delivery device powered by volute spring
US8708973B2 (en) 2008-10-01 2014-04-29 Shl Group Ab Medicament delivery device powered by volute spring
WO2010037759A1 (en) * 2008-10-01 2010-04-08 Shl Group Ab Medicament delivery device powered by volute spring
US10195364B2 (en) 2014-03-26 2019-02-05 L.O.M. Laboratories Inc. Gas release cell
US10765815B2 (en) 2014-10-31 2020-09-08 L.O.M. Laboratories Inc. Retractable needle syringe
US10709847B2 (en) 2015-01-20 2020-07-14 L.O.M. Laboratories Inc. Retractable needle syringe with unitary propellant release module
CN113181481A (en) * 2021-04-30 2021-07-30 鹰潭荣嘉集团医疗器械实业有限公司 Disposable self-destruction syringe

Also Published As

Publication number Publication date
NO305106B1 (en) 1999-04-06
NO970576L (en) 1998-08-10
AU6006998A (en) 1998-08-26
NO970576D0 (en) 1997-02-07

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