WO2002004050A1 - Syringe with retractable needle - Google Patents

Syringe with retractable needle Download PDF

Info

Publication number
WO2002004050A1
WO2002004050A1 PCT/AU2001/000828 AU0100828W WO0204050A1 WO 2002004050 A1 WO2002004050 A1 WO 2002004050A1 AU 0100828 W AU0100828 W AU 0100828W WO 0204050 A1 WO0204050 A1 WO 0204050A1
Authority
WO
WIPO (PCT)
Prior art keywords
syringe
plunger
outer body
annular joining
needle mounting
Prior art date
Application number
PCT/AU2001/000828
Other languages
French (fr)
Inventor
John Francisca Carmona
Original Assignee
Hillsands Corporation Pty 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 Hillsands Corporation Pty Ltd filed Critical Hillsands Corporation Pty Ltd
Priority to AU2001270353A priority Critical patent/AU2001270353A1/en
Publication of WO2002004050A1 publication Critical patent/WO2002004050A1/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    • A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston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
    • 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
    • A61M2005/31516—Piston or piston-rod constructions, e.g. connection of piston with piston-rod reducing dead-space in the syringe barrel after delivery
    • 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
    • A61M2005/3241—Needle retraction energy is accumulated inside of a hollow plunger rod
    • A61M2005/3242—Needle retraction by vacuum
    • 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
    • A61M5/3278—Apparatus for destroying used needles or syringes
    • A61M2005/3279—Breaking syringe nozzles or needle hubs
    • 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

Definitions

  • the present invention relates to a syringe.
  • an outer body and a hollow plunger characterised by an outer body and a hollow plunger, the outer body including a needle mounting portion and the hollow plunger including an end piece, the needle mounting portion and the end piece being arranged to withdraw within the hollow plunger following use of the syringe.
  • Figure 1 is a perspective view of syringe in accordance with the present invention.
  • Figure 2 is a cross sectional view of the syringe of Figure 1 in a first position
  • Figure 3 is a cross sectional view of the syringe of Figure 1 in a second position
  • Figure 4 is a cross sectional view of the syringe of Figure 1 in a third position
  • Figure 5 is a cross sectional view of the syringe of Figure 1 in a final position.
  • a syringe 10 having a substantially cylindrical outer body 12 which is hollow and arranged, in use, to receive a parenteral fluid.
  • the outer body 12 has a substantially cylindrical internal wall 13
  • the outer body 12 has a first end 14 and a second end 16.
  • the outer body 12 is substantially open at the second end 16.
  • the outer body 12 includes a needle mounting portion 18 arranged at the first end 14 of the outer body 12.
  • the needle mounting portion 18 comprises an annular base portion 20 and a substantially cylindrical receiving portion 22.
  • the annular base portion 20 is adjacent the first end 14 of the outer body 12, and acts to partially close the first end 14 of the outer body 12.
  • the annular base portion 20 is connected to the inner wall 13 at first end 14 of the outer body portion 12 by a first annular joining portion 24.
  • the cylindrical receiving portion 22 extends from the annular base portion 14 in a direction away from the outer body 12.
  • a needle 26 extends outwardly from the cylindrical receiving portion 22.
  • the cylindrical receiving portion 22 is hollow so as to provide a fluid flow path between the outer body 12 and the needle 26.
  • a plunger 28 is arranged to slide within the outer body 12.
  • the plunger 28 is
  • substantially cylindrical in shape and has a first end 30 which is oriented towards the first end 14 of the outer body 12, and a second end 32 which is oriented away from the first end 14 of the outer body 12.
  • the plunger 28 is hollow and includes a recess 34 which extends axially within the plunger 28 from the first end 30.
  • the recess 34 is closed at the first end 30 of the plunger by an end piece 36.
  • the recess 34 extends along the full length of the plunger 28.
  • the end piece 36 comprises an engagement member 38 in the form of a post, and a substantially frusto-conical base portion 40.
  • the frusto-conical base portion 40 is connected to the plunger 28 adjacent the first end 30 by an second annular joining portion 42.
  • the second annular joining portion 42 is thin relative to the frust-conical base portion 40, and is arranged to sever under the action of a shearing force. Such a force can be provided by the application of a compressive force between the plunger 28 and the end piece 36.
  • the engagement member 38 is substantially cylindrical in shape, and is coaxial to the plunger 28 and the syringe 10.
  • the engagement member 38 extends from the frusto- conical base portion 40 towards the first end 14 of the outer body 12, and has an external diameter slightly larger than the internal diameter of the receiving portion 22 of the needle mounting potion 18.
  • the plunger 28 includes a substantially circular cutting means 44 extending from the first end 30 of the plunger 28 towards the first end 14 of the outer body 12.
  • the cutting means 44 is the form of an annular blade, which tapers to a relatively thin, sharp edge remote from the first end 30 of the plunger 28.
  • the edge of the cutting means 44 has a diameter similar to that of the first annular joining portion 24.
  • the plunger 28 is arranged such that the engagement member 38 extends further than the cutting means 44.
  • the plunger 28 further includes a sealing means 46 located adjacent the first end 30 of the plunger 28.
  • the sealing means 46 comprises first and second radial extensions 48, 50 and a resilient sealing ring 52.
  • the radial extensions 48,50 have an external diameter equal to the diameter of the internal wall 13 of the outer body 12.
  • the resilient sealing ring 52 is provided between the first and second radial extensions 48,
  • the recess 34 of the plunger 28 is manufactured to contain a relative vacuum therein.
  • the outer body 12 of the syringe 10 is then filled with parenteral fluid by known methods, and a patient is injected with the parenteral fluid through the needle 26 by depressing the plunger 28. This is achieve by applying pressure to the second end 32 of the plunger 28 relative to the second end 16 of the outer body 12.
  • the engagement member 38 Towards the end of an injection stroke the engagement member 38 is adjacent the receiving portion 22. Further pressure applied to the second end 32 of the causes the engagement member 38 to enter the receiving portion 22. As the engagement member 38 is slightly larger than the receiving portion 22, the engagement member 38 is connected to the receiving portion 22 in a press fit. This situation is shown in Figure 3.
  • the sealing means 46 prevents the ingress of air into the recess 34.
  • the continued application of pressure to the second end 32 of the plunger 28 causes the cutting means 44 to pierce the first annular joining portion 24, thus separating the needle mounting portion 18 from the outer body 12.

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Abstract

A syringe (10) comprises an outer body (12) and a hollow plunger (28). The outer body (12) includes a needle mounting portion (18), and the plunger (28) includes an endpiece (36). Follwoing use of the syringe (10) the needle mounting portion (18) and the endpiece (36) are withdrawn within the body of the plunger (28).

Description

SYRINGE WITH RETRACTABLE NEEDLE
FIELD OF THE INVENTION
The present invention relates to a syringe.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention there is provided a syringe
characterised by an outer body and a hollow plunger, the outer body including a needle mounting portion and the hollow plunger including an end piece, the needle mounting portion and the end piece being arranged to withdraw within the hollow plunger following use of the syringe.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is a perspective view of syringe in accordance with the present invention;
Figure 2 is a cross sectional view of the syringe of Figure 1 in a first position;
Figure 3 is a cross sectional view of the syringe of Figure 1 in a second position;
Figure 4 is a cross sectional view of the syringe of Figure 1 in a third position; and
Figure 5 is a cross sectional view of the syringe of Figure 1 in a final position. DESCRIPTION OF THE INVENTION
Referring to the Figures, there is shown a syringe 10 having a substantially cylindrical outer body 12 which is hollow and arranged, in use, to receive a parenteral fluid. The outer body 12 has a substantially cylindrical internal wall 13 The outer body 12 has a first end 14 and a second end 16. The outer body 12 is substantially open at the second end 16.
The outer body 12 includes a needle mounting portion 18 arranged at the first end 14 of the outer body 12. The needle mounting portion 18 comprises an annular base portion 20 and a substantially cylindrical receiving portion 22. The annular base portion 20 is adjacent the first end 14 of the outer body 12, and acts to partially close the first end 14 of the outer body 12. The annular base portion 20 is connected to the inner wall 13 at first end 14 of the outer body portion 12 by a first annular joining portion 24.
The cylindrical receiving portion 22 extends from the annular base portion 14 in a direction away from the outer body 12. A needle 26 extends outwardly from the cylindrical receiving portion 22. The cylindrical receiving portion 22 is hollow so as to provide a fluid flow path between the outer body 12 and the needle 26.
A plunger 28 is arranged to slide within the outer body 12. The plunger 28 is
substantially cylindrical in shape, and has a first end 30 which is oriented towards the first end 14 of the outer body 12, and a second end 32 which is oriented away from the first end 14 of the outer body 12.
The plunger 28 is hollow and includes a recess 34 which extends axially within the plunger 28 from the first end 30. The recess 34 is closed at the first end 30 of the plunger by an end piece 36. In the embodiment of the drawings the recess 34 extends along the full length of the plunger 28.
The end piece 36 comprises an engagement member 38 in the form of a post, and a substantially frusto-conical base portion 40. The frusto-conical base portion 40 is connected to the plunger 28 adjacent the first end 30 by an second annular joining portion 42. The second annular joining portion 42 is thin relative to the frust-conical base portion 40, and is arranged to sever under the action of a shearing force. Such a force can be provided by the application of a compressive force between the plunger 28 and the end piece 36.
The engagement member 38 is substantially cylindrical in shape, and is coaxial to the plunger 28 and the syringe 10. The engagement member 38 extends from the frusto- conical base portion 40 towards the first end 14 of the outer body 12, and has an external diameter slightly larger than the internal diameter of the receiving portion 22 of the needle mounting potion 18.
The plunger 28 includes a substantially circular cutting means 44 extending from the first end 30 of the plunger 28 towards the first end 14 of the outer body 12. The cutting means 44 is the form of an annular blade, which tapers to a relatively thin, sharp edge remote from the first end 30 of the plunger 28. The edge of the cutting means 44 has a diameter similar to that of the first annular joining portion 24. The plunger 28 is arranged such that the engagement member 38 extends further than the cutting means 44.
The plunger 28 further includes a sealing means 46 located adjacent the first end 30 of the plunger 28. The sealing means 46 comprises first and second radial extensions 48, 50 and a resilient sealing ring 52. The radial extensions 48,50 have an external diameter equal to the diameter of the internal wall 13 of the outer body 12. The resilient sealing ring 52 is provided between the first and second radial extensions 48,
50 and provides a fluid seal between the internal wall 13 and the plunger 28.
In use, the recess 34 of the plunger 28 is manufactured to contain a relative vacuum therein. The outer body 12 of the syringe 10 is then filled with parenteral fluid by known methods, and a patient is injected with the parenteral fluid through the needle 26 by depressing the plunger 28. This is achieve by applying pressure to the second end 32 of the plunger 28 relative to the second end 16 of the outer body 12.
Towards the end of an injection stroke the engagement member 38 is adjacent the receiving portion 22. Further pressure applied to the second end 32 of the causes the engagement member 38 to enter the receiving portion 22. As the engagement member 38 is slightly larger than the receiving portion 22, the engagement member 38 is connected to the receiving portion 22 in a press fit. This situation is shown in Figure 3.
The application of further pressure to the second end 32 of the plunger 28 causes a servering of the second annular joining portion 42, thus separating the end piece 36 from the plunger 28. This situation is shown in Figure 4. The severing of the second annular joining portion 42 allows the cutting means 44 to move adjacent to the first annular joining portion 24.
At this stage the sealing means 46 prevents the ingress of air into the recess 34. The continued application of pressure to the second end 32 of the plunger 28 causes the cutting means 44 to pierce the first annular joining portion 24, thus separating the needle mounting portion 18 from the outer body 12.
This piercing of the first annular joining portion allows the needle mounting portion 18 and the end piece 36, which are held together by a press fit, to move relative to the plunger 28 and outer body 12. The partial vacuum within the recess 34 is arranged to be sufficient to cause the end piece 36 and the needle mounting portion 18 to be withdrawn into the recess 34 towards the second end 32 of the plunger 28. This situation is shown in Figure 5.
In this way the needle 26 is withdrawn within the plunger 28.
Modifications and variations as would be apparent to a skilled addressee are deemed to be within the scope of the present invention.

Claims

1. A syringe characterised by an outer body and a hollow plunger, the outer body including a needle mounting portion and the hollow plunger including an end piece, the needle mounting portion and the end piece being arranged to withdraw within the hollow plunger following use of the syringe.
2. A syringe as claimed in Claim 1, characterised in that the end piece has an engaging portion and the needle mounting portion has a receiving means, and the engaging portion is arranged to be received within the receiving means.
3. A syringe as claimed in Claim 2, characterised in that the engaging portion is a post, and the receiving means is complementary in shape to the engaging portion.
4. A syringe as claimed in Claim 2 or Claim 3, characterised in that the engaging portion is arranged to be received within the receiving means by a press fit.
5. A syringe as claimed in any one of the preceding claims, characterised in that the needle mounting portion is joined to the outer body by means of a first annular joining portion, the first annular joining portion being severable.
6. A syringe as claimed in Claim 5, characterised in that the plunger includes a cutting means arranged to separate the needle mounting portion from the outer body by cutting the first annular joining portion.
7. A syringe as claimed in Claim 6, characterised in that the cutting means is in the form of an annular blade extending from the plunger.
8. A syringe as claimed in Claim 7, characterised in that the cutting means tapers to a relatively thin edge remote from the plunger.
9. A syringe as claimed in any one of Claims 5 to 8, characterised in that the end piece is joined to the plunger by a second annular joining portion, the second annular joining portion being severable.
10. A syringe as claimed in Claim 9, characterised in that the second annular joining means is arranged to break upon application of a compressive force between the plunger and the end piece.
11. A syringe as claimed in Claim 10, characterised in that the second annular joining means is arranged to break before the first annular joining means is severed.
12. A syringe according to any one of the preceding claims, characterised in that the plunger includes a recess, the recess containing a partial vacuum.
13. A syringe according to any one of the preceding claims, characterised in that the plunger includes a sealing means arranged to engage with an inner wall of the outer body.
PCT/AU2001/000828 2000-07-10 2001-07-10 Syringe with retractable needle WO2002004050A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001270353A AU2001270353A1 (en) 2000-07-10 2001-07-10 Syringe with retractable needle

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPQ8649A AUPQ864900A0 (en) 2000-07-10 2000-07-10 A syringe
AUPQ8649 2000-07-10

Publications (1)

Publication Number Publication Date
WO2002004050A1 true WO2002004050A1 (en) 2002-01-17

Family

ID=3822714

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2001/000828 WO2002004050A1 (en) 2000-07-10 2001-07-10 Syringe with retractable needle

Country Status (2)

Country Link
AU (1) AUPQ864900A0 (en)
WO (1) WO2002004050A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1726321A2 (en) * 2005-05-26 2006-11-29 Chang-Tzu Chen Safety hypodermic syringe
FR2898504A1 (en) * 2006-02-14 2007-09-21 Feng Hui Lu Safety injection syringe used in medicine for injecting liquid medicine comprises a cylinder, a connecting rod inserted into the hollow passage of the cylinder, a drive group and a needle holder inserted into the pump of the drive group

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5000736A (en) * 1990-03-22 1991-03-19 Harry Kaufhold, Jr. Disposable syringe with automatic needle retraction
US5053010A (en) * 1990-10-03 1991-10-01 Triad Technology Safety syringe with retractable needle
WO1993007923A1 (en) * 1991-10-15 1993-04-29 Kaufhold Harry Jr Disposable syringe with automatic needle retraction
WO1995031236A1 (en) * 1994-05-18 1995-11-23 Steven Michael Sutton A safety syringe
US5935104A (en) * 1998-08-21 1999-08-10 Safety Medical Manufacturing, Incorporated Safety medical syringe with retractable needle
US6017325A (en) * 1998-05-21 2000-01-25 Yerfino; Daniel Alberto Disposable syringe with automatically retractable hypodermic needle
US6036674A (en) * 1998-12-18 2000-03-14 Becton Dickinson And Company Retracting needle syringe

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5000736A (en) * 1990-03-22 1991-03-19 Harry Kaufhold, Jr. Disposable syringe with automatic needle retraction
US5053010A (en) * 1990-10-03 1991-10-01 Triad Technology Safety syringe with retractable needle
WO1993007923A1 (en) * 1991-10-15 1993-04-29 Kaufhold Harry Jr Disposable syringe with automatic needle retraction
WO1995031236A1 (en) * 1994-05-18 1995-11-23 Steven Michael Sutton A safety syringe
US6017325A (en) * 1998-05-21 2000-01-25 Yerfino; Daniel Alberto Disposable syringe with automatically retractable hypodermic needle
US5935104A (en) * 1998-08-21 1999-08-10 Safety Medical Manufacturing, Incorporated Safety medical syringe with retractable needle
US6036674A (en) * 1998-12-18 2000-03-14 Becton Dickinson And Company Retracting needle syringe

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1726321A2 (en) * 2005-05-26 2006-11-29 Chang-Tzu Chen Safety hypodermic syringe
EP1726321A3 (en) * 2005-05-26 2007-04-18 Chang-Tzu Chen Safety hypodermic syringe
FR2898504A1 (en) * 2006-02-14 2007-09-21 Feng Hui Lu Safety injection syringe used in medicine for injecting liquid medicine comprises a cylinder, a connecting rod inserted into the hollow passage of the cylinder, a drive group and a needle holder inserted into the pump of the drive group

Also Published As

Publication number Publication date
AUPQ864900A0 (en) 2000-08-03

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