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WO1990008565A1 - Seringue a usage unique - Google Patents

Seringue a usage unique Download PDF

Info

Publication number
WO1990008565A1
WO1990008565A1 PCT/GB1990/000124 GB9000124W WO9008565A1 WO 1990008565 A1 WO1990008565 A1 WO 1990008565A1 GB 9000124 W GB9000124 W GB 9000124W WO 9008565 A1 WO9008565 A1 WO 9008565A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
rod
lugs
syringe
formation
Prior art date
Application number
PCT/GB1990/000124
Other languages
English (en)
Inventor
Richard Kiteley Power
John David Yair
Original Assignee
R & R Inventions Limited
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
Priority claimed from GB898902223A external-priority patent/GB8902223D0/en
Priority claimed from GB898924487A external-priority patent/GB8924487D0/en
Application filed by R & R Inventions Limited filed Critical R & R Inventions Limited
Publication of WO1990008565A1 publication Critical patent/WO1990008565A1/fr

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
    • A61M5/50—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

Definitions

  • This invention relates to medical syringes of the kind intended to be used once only, so as to prevent cross-infection for example amongst drug abusers.
  • Many designs have been suggested, but hitherto, so far as me are aware, all have suffered from one or other of a number of disadvantages.
  • the objection of the present invention is to solve these problems and provide a syringe which is completely disabled in a manner preventing re-use after a mere single cycle.
  • a medical syringe comprises a barrel having a needle at one end (or being adapted to be connected to a needle at one end), a tubular piston, a piston rod arranged to extend through the piston and having a shoulder to abut one end of the piston for displacing it in a barrel-contents ejection stroke when the piston is in one axial position relative to the piston rod, the opposite end of the piston being held to the rod when the piston is in a second axially displaced position on said rod by one or more lugs engaged between an abutment on the rod and a formation of the piston, characterised in that said lugs are separate entities at least after initial assembly and before the syringe is first filled, said lugs being retained in engagement during filling by the said formation and the arrangement being such that the lugs cease to be retained and become disengaged when the piston and rod move relative to one another from said second axial position.
  • This arrangement can be suction filled in a first cycle of operations whilst the lugs are in the engaged position, but as soon as the rod travel direction is reversed, e.g. the ejection stroke begins, the lugs can be expected to fall out of position or be displaced out of position and cannot effectively be re-inserted subsequently.
  • suction filling for a second cycle of operations is impossible.
  • Back-filling for the second cycle may be prevented even if the syringe is discarded at the end of the ejection stroke because the lugs may also be used (in the first cycle) to hold the piston and abutment in one sealed condition, and the subsequent disengagement of the lugs permits relative movement so that the seal is disabled.
  • Initial assembly may be achieved by locating the rod, piston and lugs in an assembled condition, and displacing them in required positions along the length of the barrel by an air blast.
  • Figures 1 - 8 show successive stages in the life of a once-only syringe.
  • the syringe has a cruciform section piston rod terminating in a disc 12.
  • a rod extension has a first circular cross sectional part 18, a second generally conical part 20 and a cylindrical head 22.
  • a pair of lugs 24 extend for example at right angles to the axis of the rod in original manufacture, and all of these mentioned parts are moulded unitarily as a single piece from a relatively brittle material for example polystyrene.
  • the piston 26 is of a soft rubber or like and is tubular with an enlarged diameter chamber between its ends which are constituted by cylindrical axially aligned passages of a common diameter.
  • the piston is assembled to the rod by folding the lugs backwardly so as to lie closely adjacent to the conical part which is of a suitably reduced dimension to permit this as well as having a certain minimum dimension smaller than that of the head 22 for the purpose explained hereinafter.
  • the rod extension is pushed through the bore of the piston for example by deforming the soft resilient material of the piston into an ellipse having its major axis coincident with a plane diametric of the piston rod and containing the lugs. After the lugs have passed through the one small end of the piston and entered the chamber the deformation of the piston can be relaxed and the resilience will return the piston to a circular shape.
  • the lugs are of the same length as the chamber so that they are accommodated wholly therein as a close fit in the chamber.
  • the so-assembled piston and rod are pushed into the barrel as generally shown in Figure 1.
  • the movement is continued through the Figure 2 and Figure 3 positions.
  • the Figure 3 position may be the one in which the syringe leaves the factory ready for use.
  • the barrel 30 is an appropriate diameter for the piston and has an attached needle 35 or means for attaching the same.
  • the barrel also has an anvil formation 32 on its interior bottom end and this projects upwardly about a recess 34 shaped and dimensioned to accept the head 22 fairly closely.
  • the rim of that recess, which is an operative anvil face may be square or acutely angled.
  • the adjacent face of the piston s of complementary shape to the end of the barrel. The anvil will contact the root of each lug, that is to say a thin portion immediately adjacent to the head, at a point where the plastic is already stressed by the folding operation.
  • Figure 4 shows the beginning of the operation, when the resistance to movement of the piston causes it to lag as the piston rod is retracted until the lugs have moved with the piston rod, because of their abutment behind the head, and have come into engagement with the top end of the chamber in the piston.
  • the Figure 4 position of piston and rod represents the relative positions of these parts during the whole of the filling cycle.
  • sealing against leakage in syringe filling is provided by the fit between the completely cylindrical portion of the first part 18 of the piston rod and the bore of the piston above the chamber, and in ejection by the same formations plus the disc/piston end contact.

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 médicale à usage unique possède un piston (26) relié à la tige (10) au moyen d'ergots (24) enfermés dans le piston. A la fin du montage initial en usine, un profil (32) dans le cylindre (30) sert à cisailler les ergots de la tige, lesdits ergots restant efficaces lors d'une première position de remplissage en se déplaçant comme des butées entre un rebord derrière la tête (22) et l'extrémité opposée de la chambre interne du piston. Lorsqu'on éjecte pour la première fois le contenu de la seringue, la tige du piston se déplace relativement au piston de telle sorte que le disque (12) entre en contact avec le piston de façon à le pousser le long du cylindre, la formation conique (20) sur la tige forçant les ergots radialement vers les limites de la chambre du piston, lesdits ergots se coinçant dans la chambre sans assumer une position de butée par rapport au piston. La seringue ne peut pas être remplie de nouveau par succion ni par recharge à travers l'aiguille à cause du déplacement de la tige vers l'extérieur du piston.
PCT/GB1990/000124 1989-02-01 1990-01-29 Seringue a usage unique WO1990008565A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB8902223.0 1989-02-01
GB898902223A GB8902223D0 (en) 1989-02-01 1989-02-01 Disposable syringe
GB8924487.5 1989-10-31
GB898924487A GB8924487D0 (en) 1989-10-31 1989-10-31 Disposable syringe

Publications (1)

Publication Number Publication Date
WO1990008565A1 true WO1990008565A1 (fr) 1990-08-09

Family

ID=26294898

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1990/000124 WO1990008565A1 (fr) 1989-02-01 1990-01-29 Seringue a usage unique

Country Status (1)

Country Link
WO (1) WO1990008565A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992018185A1 (fr) * 1991-04-17 1992-10-29 Med-Plastic Ag Dispositif d'injection a usage unique
US5226882A (en) * 1990-09-24 1993-07-13 Medi Pluc Tec, Medizinisch-Technische Handels-Gesellschaft Mbh Single-use syringe with non-retractable piston
FR2744925A1 (fr) * 1996-02-21 1997-08-22 Lahlou Khalid Pierre Joint pour seringue non reutilisable, et seringue non reutilisable comportant un tel joint
FR2750052A1 (fr) * 1996-06-21 1997-12-26 Lahlou Khalid Pierre Seringue non reutilisable
EP1508346A1 (fr) * 2003-08-16 2005-02-23 Jörg Schwarzbich Séringue empêchant la ré-utilisation

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4391272A (en) * 1978-03-10 1983-07-05 Tulcea, S.A. Disposable syringe
US4775363A (en) * 1986-01-07 1988-10-04 Christian Sandsdalen Arrangement in injection syringe for use once only
EP0304386A2 (fr) * 1987-05-22 1989-02-22 Rovira Mestres, Ramon Seringue pour l'injection de fluides, comprenant un mécanisme la rendant non réutilisable
EP0329358A2 (fr) * 1988-02-17 1989-08-23 R & R INVENTIONS LIMITED Seringue à jeter
EP0336855A1 (fr) * 1988-03-21 1989-10-11 Microtechnic S.A. Seringue à usage unique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4391272A (en) * 1978-03-10 1983-07-05 Tulcea, S.A. Disposable syringe
US4775363A (en) * 1986-01-07 1988-10-04 Christian Sandsdalen Arrangement in injection syringe for use once only
EP0304386A2 (fr) * 1987-05-22 1989-02-22 Rovira Mestres, Ramon Seringue pour l'injection de fluides, comprenant un mécanisme la rendant non réutilisable
EP0329358A2 (fr) * 1988-02-17 1989-08-23 R & R INVENTIONS LIMITED Seringue à jeter
EP0336855A1 (fr) * 1988-03-21 1989-10-11 Microtechnic S.A. Seringue à usage unique

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5226882A (en) * 1990-09-24 1993-07-13 Medi Pluc Tec, Medizinisch-Technische Handels-Gesellschaft Mbh Single-use syringe with non-retractable piston
WO1992018185A1 (fr) * 1991-04-17 1992-10-29 Med-Plastic Ag Dispositif d'injection a usage unique
FR2744925A1 (fr) * 1996-02-21 1997-08-22 Lahlou Khalid Pierre Joint pour seringue non reutilisable, et seringue non reutilisable comportant un tel joint
FR2750052A1 (fr) * 1996-06-21 1997-12-26 Lahlou Khalid Pierre Seringue non reutilisable
EP1508346A1 (fr) * 2003-08-16 2005-02-23 Jörg Schwarzbich Séringue empêchant la ré-utilisation

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