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WO1993002726A1 - Perfectionnements apportes a des seringues - Google Patents

Perfectionnements apportes a des seringues Download PDF

Info

Publication number
WO1993002726A1
WO1993002726A1 PCT/GB1992/001444 GB9201444W WO9302726A1 WO 1993002726 A1 WO1993002726 A1 WO 1993002726A1 GB 9201444 W GB9201444 W GB 9201444W WO 9302726 A1 WO9302726 A1 WO 9302726A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
dosing unit
needle
pushrod
holder
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.)
Ceased
Application number
PCT/GB1992/001444
Other languages
English (en)
Inventor
John Lawson Stanford
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.)
University College London
Original Assignee
University College London
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 University College London filed Critical University College London
Publication of WO1993002726A1 publication Critical patent/WO1993002726A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • A61M5/1782—Devices aiding filling of syringes in situ
    • 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
    • A61M5/28—Syringe ampoules or carpules, i.e. ampoules or carpules provided with a needle
    • 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
    • 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
    • A61M5/31515—Connection of piston with piston rod
    • 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
    • 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
    • A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel

Definitions

  • the present invention relates to syringes, particularly, but not exclusively, to syringes of the hypodermic intradermal type.
  • a hypodermic syringe having a discharge piston pushrod, a dosing unit comprising a body having an internal volume, a hypodermic needle attached to the body and forming an integral part of the dosing unit and a piston within the internal volume of the body for discharging material from the internal volume through the needle, the piston being unattached to any pushrod operative to cause a discharge stroke thereof.
  • a holder for use with a dosing unit having a hypodermic needle and piston as a hypodermic syringe, the holder comprising a generally cylindrical hollow barrel having a piston pushrod therein for operating the piston, a seat defined at the other end of the barrel for receiving the dosing unit with its needle extending longitudinally away from the barrel and a safety guard extending longitudinally away from the barrel so as to be in side-by- side relation to the needle when the dosing unit is installed to restrict access to the tip of the needle.
  • both aspects of the invention may be embodied in the same hypodermic syringe.
  • the first aspect of the invention addresses the problem of preventing re-use and overcomes it effectively preventing the dosing unit of the syringe from being refilled.
  • the pushrod is connected to the piston to enable it to be retracted during a filling operation.
  • Having the two unconnected, as in the first aspect of the invention requires an alternative filling method which can be adapted to hamper re-use of the needle, for example, by providing a single-use piston retraction element which is detached from the dosing unit after a filling operation and which cannot thereafter easily be re-attached.
  • the guard is intended to reduce the risk of accidental contact with the needle tip while administering an injection.
  • the guard is rigid.
  • it can be resilient and shaped so as to cover the tip and be deflected out of the way during an intentional injection.
  • the needle extends right up to the internal volume of the piston cylinder and the closed end of the cylinder is of a surface shape complementary to that of the facing surface of the piston so that the only dead space when the piston is in its fully discharge position is, for practical purposes, the interior volume of the needle. This low dead space volume reduces wastage of the liquid which is injected.
  • the dosing unit can be releasably attached to the holder by providing a mounting on the holder in the form of a cradle into which the dosing unit is releasably insertable and in which it is held captive during use. Once the dosing unit is firmly fixed to the holder/pushrod sub-assembly, the pushrod is able to make contact with the outer face of the piston but not to connect to it.
  • a further preferred feature of the invention is the attachment of a cap to the dosing unit, whether or not it is integral with the holder, in order to seal hermetically the latter.
  • the cap may be attached by means of complementary circumferential formations on the inner periphery of the cap and the outer periphery of the dosing unit.
  • Figures la and lb are longitudinal sectional view through the holder and dosing unit in one form of syringe embodying both aspects of the present invention
  • Figure 2a shows the dosing unit of fig lb prior to filling
  • Figure 2b shows part of a variant of the dosing unit of figure 2a.
  • FIG 2a this illustrates the dosing unit 1 of the syringe prior to filling.
  • the dosing unit comprises a cylindrical body 3 having an internal volume 5 in which is located a cylindrical piston 7 of any suitable material.
  • the movement of the piston 7 is limited in one direction by the end 3a of the dosing unit body and, at the outer end by a radially inwardly directed rib 3b which retains the piston 7 captive within the body 3.
  • a hypodermic needle 9 extends forwardly of the body 3 and is permanently attached to it.
  • a removable cylindrical cap 11 protects the needles prior to filling and use.
  • the surface of the end 3a of the body 3 is of complementary shape, in this case simply plain, to that of the facing surface of the piston 7 so that when the piston 7 is in its fully discharged position, there is no dead space within the internal volume 5 and the only dead space within the dosing unit as a whole is the internal volume of the needle 9.
  • a retraction element 13 comprising a finger grip 15 is attached to the piston 7.
  • the finger grip 15 is connected to the piston 7 via a flexible link 17 which has an enlarged end accommodated in a recess in the outer end face of the piston 7.
  • the dosing unit is filled by removing the cap 11, inserting the needle 9 into the required liquid and then pulling the finger grip 15 away from the body 3 of the dosing unit.
  • the connection of the retraction element 13 to the piston 7 and the ribbed end wall 3b of the body 3 are designed such that the force required to detach the retraction element from the piston 7 is greater than that required to extract the piston 7 from the internal volume 5 by pulling.
  • the link 17 could, if desired, be provided with a weakened portion near the piston 7 which would be broken off at the end of the filling operation and thereby prevent refilling.
  • the flexibility of the link 17 is intended to ensure that pushing the finger grip 15 towards the dosing unit 3 causes the link to flex rather than to push the piston 7 towards its discharge position.
  • the element 13 is intended as a single-use filling only attachment.
  • the dosing unit is temporarily fitted, for the purpose of administering an injection, to the holder 20 shown in figure la.
  • This comprises a generally cylindrical hollow barrel 21 having a slidable pushrod 23 mounted therein.
  • a part 21a of the barrel 21 is cut away so as to provide, in conjunction with an inwardly directed annular ridge 25 a seat for accommodating the dosing unit 1 in a secure fashion.
  • the ridge 25 provides a reaction surface to resist leftwards movement of the dosing unit 1 as the pushrod 23 is pushed towards it.
  • the pushrod 23 has a reduced diameter end portion 23a which can extend into the interior of the dosing unit body 3 and abut the outer end face of the piston 7.
  • a safety guard 27 Extending forwardly (ie, leftwardly in figure la) of the barrel 21 is a safety guard 27. This is defined by an extension of 27a of the diametral cutaway which forms the seat 21a and an obliquely cut portion 27b so that the guard overall resembles the shape of a trocar. It will be noted that the end of the guard 27 extends longitudinally away from the barrel somewhat beyond the tip of the needle.
  • the needle can be inserted into the patient's skin obliquely as in an intradermal injection it restricts access to the tip longitudinally of the syringe and therefore will serve to restrict inadvertent contact with the tip.
  • the radially inner surface of the guard 27 is part cylindrical, it serves as a guide to assist in repositioning the closure cap 11 on the dosing unit while the latter is still installed in the holder while reducing inadvertent contact with the needle tip during that operation.
  • Figure 2b shows part of a variant of the dosing unit of figure 2a in which the body 3 is provided with a circumferential groove 30 complementary to the cross- sectional shape of the rib 25 to ensure more secure engagement of the unit with the holder 20. This would enable the cap 11 to be fitted more firmly to the body 3 during insertion of the dosing unit in the holder and its subsequent removal.

Landscapes

  • Health & Medical Sciences (AREA)
  • Vascular Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (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

Une seringue hypodermique intradermique se compose de deux parties, à savoir une unité de dosage qui incorpore l'aiguille (9) et le piston (7) et un sous-ensemble tige-poussoir (20) et support de piston sur lequel l'unité de dosage s'adapte temporairement pendant l'utilisation. A cet effet, la tige-poussoir de piston est placée simplement en about du piston (18) mais ne lui est pas reliée, ce qui empêche de retirer le piston après utilisation, un élément de rétraction séparé (15) à utilisation unique permettant de remplir l'unité de dosage. La seringue comprend une protection (27) qui s'étend depuis le corps de l'unité de dosage le long de la seringue et qui dépasse la pointe de l'aiguille (9) pour empêcher tout contact accidentel avec ladite pointe.
PCT/GB1992/001444 1991-08-01 1992-08-03 Perfectionnements apportes a des seringues Ceased WO1993002726A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9116595.1 1991-08-01
GB919116595A GB9116595D0 (en) 1991-08-01 1991-08-01 Improvements in or relating to syringes

Publications (1)

Publication Number Publication Date
WO1993002726A1 true WO1993002726A1 (fr) 1993-02-18

Family

ID=10699334

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1992/001444 Ceased WO1993002726A1 (fr) 1991-08-01 1992-08-03 Perfectionnements apportes a des seringues

Country Status (2)

Country Link
GB (1) GB9116595D0 (fr)
WO (1) WO1993002726A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999020327A3 (fr) * 1997-10-21 1999-07-01 I Flow Corp Seringue de perfusion a ressort
EP2394683A1 (fr) * 2004-06-10 2011-12-14 Safety Syringes, Inc. Mélange et fourniture de diluants pour système de distribution passif
US9682198B2 (en) 2003-08-28 2017-06-20 Becton, Dickinson And Company Intradermal injection device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2833280A (en) * 1952-12-19 1958-05-06 Jr George N Hein Syringe assembly
US3023751A (en) * 1957-07-02 1962-03-06 Seymour R Lipsky Injection apparatus and ampule
US3720211A (en) * 1971-08-18 1973-03-13 G Kyrias Automatic injection system
US4518384A (en) * 1983-06-17 1985-05-21 Survival Technology, Inc. Multiple medicament cartridge clip and medicament discharging device therefor
EP0282097A1 (fr) * 1987-03-13 1988-09-14 Habley Medical Technology Corporation Seringue de contrôle de maladie à aiguille rétractable
EP0361829A2 (fr) * 1988-09-27 1990-04-04 Eli Lilly And Company Pistolet d'injection à cartouche

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2833280A (en) * 1952-12-19 1958-05-06 Jr George N Hein Syringe assembly
US3023751A (en) * 1957-07-02 1962-03-06 Seymour R Lipsky Injection apparatus and ampule
US3720211A (en) * 1971-08-18 1973-03-13 G Kyrias Automatic injection system
US4518384A (en) * 1983-06-17 1985-05-21 Survival Technology, Inc. Multiple medicament cartridge clip and medicament discharging device therefor
EP0282097A1 (fr) * 1987-03-13 1988-09-14 Habley Medical Technology Corporation Seringue de contrôle de maladie à aiguille rétractable
EP0361829A2 (fr) * 1988-09-27 1990-04-04 Eli Lilly And Company Pistolet d'injection à cartouche

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999020327A3 (fr) * 1997-10-21 1999-07-01 I Flow Corp Seringue de perfusion a ressort
US9682198B2 (en) 2003-08-28 2017-06-20 Becton, Dickinson And Company Intradermal injection device
EP2394683A1 (fr) * 2004-06-10 2011-12-14 Safety Syringes, Inc. Mélange et fourniture de diluants pour système de distribution passif

Also Published As

Publication number Publication date
GB9116595D0 (en) 1991-09-18

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