CA2183823A1 - Structure of safety hypodermic syringe - Google Patents

Structure of safety hypodermic syringe

Info

Publication number
CA2183823A1
CA2183823A1 CA002183823A CA2183823A CA2183823A1 CA 2183823 A1 CA2183823 A1 CA 2183823A1 CA 002183823 A CA002183823 A CA 002183823A CA 2183823 A CA2183823 A CA 2183823A CA 2183823 A1 CA2183823 A1 CA 2183823A1
Authority
CA
Canada
Prior art keywords
barrel
plunger
needle holder
needle
needle cannula
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.)
Abandoned
Application number
CA002183823A
Other languages
French (fr)
Inventor
Long-Hsiung Chen
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.)
Individual
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
Application filed by Individual filed Critical Individual
Priority to CA002183823A priority Critical patent/CA2183823A1/en
Publication of CA2183823A1 publication Critical patent/CA2183823A1/en
Abandoned legal-status Critical Current

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
    • 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
    • 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
    • A61M5/32—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
    • A61M5/34—Constructions for connecting the needle, e.g. to syringe nozzle or needle hub
    • A61M5/347—Constructions for connecting the needle, e.g. to syringe nozzle or needle hub rotatable, e.g. bayonet or screw
    • 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
    • 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
    • A61M5/3221—Constructional features thereof, e.g. to improve manipulation or functioning
    • A61M2005/3223—Means impeding or disabling repositioning of used needles at the syringe nozzle
    • A61M2005/3224—Means to disalign the needle tip and syringe nozzle
    • 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
    • A61M2005/5073—Means for preventing re-use by disconnection of piston and piston-rod by breaking or rupturing the connection parts

Landscapes

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

Abstract

A safety hypodermic syringe in which the needle holder has an arrowhead-like rear retaining hole;
the rubber stopper has an arrowhead-like retainer rod that can be forced into engagement with the retaining hole of the needle holder for permitting the needle holder with the needle cannula to be pulled backwards to the inside of the barrel by the plunger; the plunger can be disconnected from the rubber stopper and then inserted into the front end of the barrel to deform the needle cannula when the needle cannula is received on the inside of the barrel.

Description

~ ~ 2183823 STRUCTURE OF SA~FTY HYPnn~MTc SYRINGE

BACRGROUND OF THE INVENTIQN
The present invention relates to hypodermic syringes, and relates more particularly to a safety hypodermic syringe which permits the needle holder with the needle cannula to be pulled backwards to the inside of the barrel by the plunger after injection, and permits the plunger to be disconnected from the rubber stopper and then inserted into the front end of the barrel to deform the needle cannula inside the barrel The needle cannula of a hypodermic syringe must be damaged after its use, and then properly disposed of. Taiwan patent publication no. 210509 discloses a safety hypodermic syringe which permits the needle cannula to be pulled backwards to the inside of the barrel after its use. However, this structure of safety hypodermic syringe must be used with a specially designed needle cannula. Another drawback of this structure of safety hypodermic syringe is that the deformed needle cannula will still project out of the barrel if the needle cap is disconnected Taiwan patent publication no. 212301 discloses another structure of safety hypodermic syringe. This structure of safety hypodermic syringe still cannot be used with ~ ~1 83~23 regular commercially available needle cannula. Taiwan patent application no. 822180~9 discloses still another structure of safety hypodermic syringe. This structure of safety hypodermic syringe is designed to adapt any of a variety of commercially available needle cannulas.
However, because the needle holder has an opening which is not sealed after the needle cannula has been moved to the inside of the barrel, the needle cannula will still project out of the barrel.

SUMMARY OF THE INV~NTION
The present invention has been accomplished to provide a safety hypodermic syringe which eliminates the aforesaid drawbacks. According to one aspect of the present invention, the needle holder has an arrowhead-like retaining hole; the rubber stopper has an arrowhead-like retainer rod that can be forced into engagement with the retaining hole of the needle holder for permitting the needle holder with the needle cannula to be pulled backwards to the inside of the barrel by the plunger. According to another aspect of the present invention, the plunger is connected to the rubber stopper by a connecting member, which has a connecting tip connected to the plunger that can be broken to let the plunger be disconnected from the 8 ~ 3 rubber stopper and then inserted into the front end of the barrel to deform the needle calmula when the needle cannula is received on the inside of the barrel.
According to still another aspect of the present invention, the front end of the barrel has an inside flange which defines a front sloping wall and a rear sloping wall of different angles such that the needle holder can be moved backwards to the inside of the barrel, but is stopped from being moved forwards to the outside of the front end of the barrel.

BRIEF D~sr~Tp~IoN OF T~E D~AWIN~S
Fig. 1 is a sectional view showing a safety hypodermic syringe according to the present invention;
Fig. 2 shows the plunger moved forwards to the inside of the barrel, and the retainer rod of the rubber stopper forced into engagement with the retaining hole of the needle holder according to the present invention;
Fig. 3 shows the needle holder and the needle cannula received on the inside of the barrel according to the present invention;
Fig 4 shows the connecting tip of the connecting member broken, and the plunger disconnected from the connecting member according to the present invention;
2 ~ 8~ 8~3 Fig. 5 shows the plunger inserted into the front neck of the barrel, and the needle cannula deformed according to the present invention.

DETAILED DESCRIPTION OF T~ PREFERR~n EMBODIMENT
Referring to Figure 1, the barrel, referenced by 10, comprises an inside flange 11 raised around the inside wall of the front neck 12 thereof. A needle holder 30 is inserted into the front neck 12 of the barrel 10 and retained in place by the inside flange 11 to hold the needle cannula, referenced by 20. The inside flange 11 has a front sloping wall 111 of small slope and a rear sloping wall 112 of different angles.
The front sloping wall 111 and the rear sloping wall 112 are so designed that the needle holder 30 can be pulled backwards into the inside of the barrel 10 but cannot be pushed forwardly out of the front neck 12 of the barrel 10. The needle holder 30 comprises a longitudinal center through hole 33, which imparts a passage between the needle cannula 20 and the holding space of the barrel 10, an inner thread 32 around the longitudinal center through hole 33 for mounting the needle cannula 20, and an arrowhead-like retaining hole 31 at the rear end of the longitudinal center through hole 33 remote from the needle cannula 20. The plunger, referenced by 40, ha~ a locating groove 402 around the periphery near the rear end. The front end of the plunger 40 is connected to a connecting member 43. The connecting member 43 has a connecting tip 401 connected to the front end of the plunger 40. The connecting tip 401 can be easily broken so that the plunger 40 can be disconnected from the connecting member 43. The connecting member 43 may be variously shaped. As an e~ample of the present invention, the connecting member 43 has a plurality of circular flange around the periphery fitting the inner diameter of the barrel 10.
A rubber stopper 41 is fixedly secured to the connecting member 43 at the front side remote from the plunger 40.
The rubber stopper 41 has an arrowhead-like retainer rod 42 which can be forced into engagement with the arrowhead-like retaining hole 31 of the needle holder 30.

Referring to Figures from 2 to 5, when the plunger 40 is moved forwards to the inside of the barrel 10, the liquid medicine is completely squeezed out of the barrel 10 through the needle cannula 20, and at the same time the arrowhead-like retainer rod 42 of the rubber stopper 41 is forced into engagement with the arrowhead-like retaining hole 31 of the needle holder 30 (see Figure 2). When the plunger 40 is pulled 21 8~23 . ~

backwards, the needle holder 30 with the needle cannula 20 are pulled backwards to the inside of the barrel 10 (see Figure 3). Because the arrowhead-like retaining hole 31 slightly slopes from the longitudinal center Saxis of the needle holder 30, the needle holder 30 and the needle cannula 20 tilt when they are moved to the inside of the barrel 10. When the connecting member 43 is stopped at the rear end of the barrel 10, the plunger 40 is disconnected from the connecting member 43 by 10breaking the connecting tip 401 (see Figure 4). Then, the plunger 40 is inserted into the front neck 12 of the barrel 10 to deform the needle cannula 20. ~hen the ~ needle cannula 20 is deformed, the locating groove 402 of the plunger 40 is engaged with the inside flange 11 15of the front neck 12 of the barrel 10, and therefore the plunger 40 is firmly retained to the front neck 12 of the barrel 10.

It is to be understood that the drawings are designed for purposes of illustration only, and are not 20intended as a definition of the limits and scope of the invention disclosed For example, the retaining hole 31 can be made of conical shape, or in the form of a triangular pyramid; the profile of the front end of the retainer rod 42 fits the configuration of the retaining 2~ 83823 hole 31 for positive engagement.

Claims (4)

1. A safety hypodermic syringe comprising a barrel having a front neck and an inside flange inside said front neck, a needle holder inserted into said front neck of said barrel and retained in place by said inside flange of said front neck of said barrel, a needle cannula fastened to said needle holder, a plunger moved in said barrel, a rubber stopper connected to said plunger by a connecting member, wherein said inside flange of said front neck of said barrel has a front sloping wall of small slope and a rear sloping wall of different angles for permitting said needle holder to be pulled backwards to an inside of said barrel and for stopping said needle holder from being forced forwards out of said front neck of said barrel; said needle holder comprises a longitudinal center through hole, which imparts a passage between said needle cannula and said barrel, an inner thread around said longitudinal center through hole for mounting said needle cannula, and a rear retaining hole at one end of said longitudinal center through hole remote from said needle cannula; said connecting member has a connecting tip connected to said plunger that can be broken to let said plunger be disconnected from said connecting member;
said rubber stopper has a retainer rod at a front end thereof fitting said retaining hole of said needle holder, said retaining rod being forced into engagement with said retaining hole of said needle holder when said rubber stopper is moved to said front neck of said barrel by said plunger, for permitting said needle holder with said needle cannula to be pulled backwards to said inside of said barrel by said plunger; said plunger can be inserted into said front neck of said barrel to deform said needle cannula when said needle holder and said needle cannula are moved to said inside of said barrel and said plunger is disconnected from the connecting tip of said connecting member; said plunger has a locating groove around a periphery of said plunger for engagement with said inside flange of said front neck of said barrel when it is inserted into front end of said barrel to deform said needle cannula.
2. The safety hypodermic syringe of claim 1 wherein said retaining hole of said needle holder is made of arrowhead-like shape, and slopes from the longitudinal center axis of said needle holder in one direction.
3. The safety hypodermic syringe of claim 1 wherein said retainer rod of said rubber stopper is shaped like an arrowhead fitting said retaining hole of said needle holder.
4. The safety hypodermic syringe of claim 1 wherein said connecting member has at least one circular flange around said periphery fitting an inner diameter of said barrel.
CA002183823A 1996-08-21 1996-08-21 Structure of safety hypodermic syringe Abandoned CA2183823A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA002183823A CA2183823A1 (en) 1996-08-21 1996-08-21 Structure of safety hypodermic syringe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA002183823A CA2183823A1 (en) 1996-08-21 1996-08-21 Structure of safety hypodermic syringe

Publications (1)

Publication Number Publication Date
CA2183823A1 true CA2183823A1 (en) 1998-02-22

Family

ID=4158771

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002183823A Abandoned CA2183823A1 (en) 1996-08-21 1996-08-21 Structure of safety hypodermic syringe

Country Status (1)

Country Link
CA (1) CA2183823A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007028190A1 (en) * 2005-09-06 2007-03-15 Global Medisafe Holdings Limited Single use safety syringe having a retractable needle
US7806860B2 (en) 2005-11-15 2010-10-05 Global Medisafe Holdings Limited Safety syringe with plunger locking means

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007028190A1 (en) * 2005-09-06 2007-03-15 Global Medisafe Holdings Limited Single use safety syringe having a retractable needle
EA013279B1 (en) * 2005-09-06 2010-04-30 Глобал Медисэйф Холдингз Лимитед Single use safety syringe having a retractable needle
CN101304776B (en) * 2005-09-06 2011-12-21 麦迪塞弗环球控股有限公司 Single use safety syringe having a retractable needle
US7806860B2 (en) 2005-11-15 2010-10-05 Global Medisafe Holdings Limited Safety syringe with plunger locking means

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Legal Events

Date Code Title Description
FZDE Discontinued