WO2007112476A1 - Améliorations de seringues rétractables - Google Patents

Améliorations de seringues rétractables Download PDF

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Publication number
WO2007112476A1
WO2007112476A1 PCT/AU2007/000365 AU2007000365W WO2007112476A1 WO 2007112476 A1 WO2007112476 A1 WO 2007112476A1 AU 2007000365 W AU2007000365 W AU 2007000365W WO 2007112476 A1 WO2007112476 A1 WO 2007112476A1
Authority
WO
WIPO (PCT)
Prior art keywords
barrel
plunger
needle
annular member
cap
Prior art date
Application number
PCT/AU2007/000365
Other languages
English (en)
Inventor
Anthony John Honeyfield
Matt Durack
Original Assignee
Imd Group 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 AU2006901753A external-priority patent/AU2006901753A0/en
Application filed by Imd Group Limited filed Critical Imd Group Limited
Publication of WO2007112476A1 publication Critical patent/WO2007112476A1/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
    • A61M5/178—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    • A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston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 provides a retractable syringe including: a barrel having a front end, a rear end and defining a receptacle for containing a liquid for injection; a needle mounted at the front end of the barrel; a hollow plunger movable within the barrel from the rear end to the front end to expel fluid out of the barrel through the needle, said plunger having an inner chamber, an axial hole at the front end of the chamber and means blocking the axial hole; resilient means adapted to urge the needle in a rearward direction; and an expandable annular member having substantially planar, parallel, front and rear facing annular surfaces, wherein the annular member is adapted to provide a seal at the front end of the barrel, and restrain the resilient means until the expandable annular member is engaged by a forward part of the plunger when the plunger reaches the front end of the barrel, such that the expandable annular member moves towards the front end of the barrel and expands to release the resilient means, whereby the axial hole is un
  • the present invention provides a retractable syringe having: a barrel having a front end, a rear end and defining a receptacle for containing a liquid for injection; a needle mounted at the front end of the barrel; a hollow plunger movable within the barrel from the rear end to the front end to expel fluid out of the barrel through the needle, said plunger having an inner chamber, an axial hole at the front end of the chamber and means blocking the axial hole; resilient means adapted to urge the needle in a rearward direction into the barrel; and an expandable annular member having substantially planar, parallel, front and rear facing annular surfaces, the annular member being adapted to provide a seal at the front end of the receptacle of the barrel, wherein the needle is adapted to engage and at least partially dislodge the means blocking the axial hole to unblock the axial hole when the plunger approaches the front end of the barrel, whereafter continued movement of the plunger towards the front end causes the expandable annular member to move
  • the barrel preferably includes an external circumferential recess adapted to snap engagingly receive one or more inwardly facing barbs on the cap.
  • the cap is preferably adapted for housing a retractable needle assembly, prior to retraction.
  • the present invention provides a retractable syringe including: a barrel having a front end, a rear end and defining a receptacle for containing a liquid for injection, the barrel including an inwardly facing shoulder at its front end; a plunger having a front end and a rear end, the plunger being movable within the barrel from the rear end to the front end of the receptacle to expel fluid out of the barrel through the needle; a plunger gasket substantially adjacent the front end of the plunger, the plunger being adapted to, upon at least partially abutting the barrel shoulder, deform towards the shoulder to thereby decrease the dead space of the syringe.
  • Fig. 1 is a perspective view of an embodiment of a 3 millilitre syringe
  • Fig. 2 is a perspective view of an embodiment of a 1 millilitre syringe
  • Fig. 3a is a cross sectional perspective view of the syringe shown in Fig. 2, near the end of the plunger stroke
  • Fig. 3b is an enlarged detailed view of the syringe shown in Fig. 3 a;
  • Fig. 4a is a cross sectional, perspective view of the syringe shown in Fig. 2, at the end of the plunger stroke;
  • Fig. 4b is an enlarged detailed view of the syringe shown in Fig. 4a;
  • Fig. 5 is a perspective view of the expandable annular member used in the syringe of Fig. 2;
  • Fig. 6 is a cross sectional, side view of the expandable annular member shown in Fig. 5;
  • Figs. 7 to 9 are sequential, cross sectional, side views of steps involved in the assembly of the barrel and cap of the syringe shown in Fig. 2;
  • Fig. 10 is a cross sectional, perspective view of the syringe shown in Fig. 1; during the plunger strokes;
  • Fig. 12b is an enlarged detailed view of the syringe shown in Fig. 12a;
  • Fig. 13 is cross sectional, perspective view of the syringe shown in Fig. 1, after needle retraction;
  • Fig. 14 is a perspective view of the plunger gasket used in the syringe of Fig. 1;
  • Fig. 15 is a cross sectional, side view of the plunger gasket shown in Fig. 14.
  • Figs. 1 and 2 show first and second embodiments of syringes 20 and 22, having 3 and 1 millilitre sizes, respectively.
  • the construction, assembly and operation of the syringes 20 and 22 is substantially identical to the syringes described in the PCT application, with the exception of the improvements which shall be described below.
  • a hollow plunger 34 is moveable within the barrel 24 from the rear end 24b to the front end 24a to expel liquid out of the barrel 24 through the needle 30.
  • the plunger 34 has an inner chamber 36, an axial hole 38 at the front end of the chamber 36 and means blocking the axial hole 38, in the form of a plug 40.
  • the plug 40 has an enlarged head 40a facing the rear end 24b of the syringe 22, which locates against an inwardly facing flange 44 near the front end of the plunger 34.
  • the rear end of the plunger 34 has a flange 34a, for supporting a user's thumb during injection, and a cap 34b to close the inner chamber 36.
  • the syringe 22 also includes a resilient means, in the form of a coil spring 46, adapted to urge the needle 30 in a rearward direction.
  • the needle 30 is retained in the position shown relative to the barrel 24 by the enlarged base part 32a of the needle hub 32 engaging with an expandable annular member 48, the latter being best shown in Figs. 5 and 6.
  • the expandable annular member 48 is formed from isoprene (or silicone) rubber.
  • the remainder of the syringe components are formed from plastics material.
  • the syringe shown in the PCT application had an expandable annular member in the form of an O-ring.
  • the expandable annular member 48 has substantially planar, parallel, front and rear facing annular surfaces 50 and 52 respectively.
  • the member 48 also has a substantially cylindrical outer wall 54 and an inwardly convex curved inner wall 56, which results in the member 48 having a substantially 'D-shaped' cross section.
  • the expandable annular member 48 is also coated with a medical lubricant during assembly to reduce friction against the interior of the barrel 24, which lowers the activation force required to retract the needle 30.
  • the syringe 22 also includes a cap 58 with a number of inwardly facing barbs 60 that snap engage with a groove 62 (see Fig. 9) near the end 26 of the barrel in order to snap engage the cap 58 to the barrel 24.
  • the cap 58 also has a lid 64. Prior to the cap 58 being engaged with the barrel 24, the annular member 48 can be conveniently positioned against the forward facing annular shoulder 24c from the (open) front end 24a of the barrel 24.
  • the syringe shown in the PCT application has an internally formed cap and barrel and an annular insert with a shoulder equivalent to shoulder 24c.
  • the insert is introduced from the rear end of the barrel and then positioned at the forward end of the barrel against the cap. Attempting to mould the syringe shown in the PCT application as a single component is very difficult and requires an undercut rim inside the barrel to locate the annual member.
  • the arrangement in the syringe 22 described above advantageously produces the same end result, and whilst using the same number of components, but is far easier, and less risky, to mould. Further, the needle 30 and spring 32 can be accurately loaded in the cap 58 prior to its engagement with the barrel 24, as will be described in more detail below.
  • the annular member 48 initially prevents the spring 46 from retracting the needle 30 and the needle hub 32 into the plunger 34 until, at the end of the plunger stroke, the annular member 48 is forced forwardly out of engagement with the needle hub 32 by the forward end of the plunger 34. Simultaneously, the needle hub 32 forces the plug 40 out of engagement with the forward end of the plunger 34. As io a result, the spring 46 can retract the needle 30, the needle hub 32 and the plug 40 into the inner chamber 36 of the plunger 34.
  • the 3 millilitre syringe 20 includes a deformable plunger gasket 82 to minimise dead volume and thus meet ISO 7886.
  • the plunger gasket 82 has substantially planar, annular front and rear services 84 and 86 joined by an inwardly curved side wall 88.
  • the plunger gasket 82 is formed from isoprene (or silicone) rubber, which is compressible.
  • the interior surface near the front end 24a of the barrel 24 has a shoulder 80 which tapers inwardly towards the barrel front end 24a.
  • the forward 0 facing annular surface 84 of the gasket 82 is initially orientated normal to the longitudinal axis of the syringe 20.

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

L'invention concerne une seringue rétractable (20) comprenant un cylindre (24), une aiguille (30), un plongeur creux (34), un moyen résistant (46) et un élément annulaire extensible (48). Ledit élément annulaire extensible (48) possède des surfaces annulaires avant (50) et arrière (52), se faisant face, sensiblement planes, parallèles. Il permet une étanchéité à l'extrémité avant (24a) du cylindre (24) et contient ledit moyen résistant (46) jusqu'à ce que l'élément annulaire (48) soit engagé par une partie avant du plongeur (34) et se déplace vers l'avant du cylindre (24), après quoi il se détend pour libérer le moyen résistant (46). L'aiguille (30) est ensuite rétractée dans le plongeur creux (34).
PCT/AU2007/000365 2006-04-04 2007-03-23 Améliorations de seringues rétractables WO2007112476A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2006901753 2006-04-04
AU2006901753A AU2006901753A0 (en) 2006-04-04 Improvements in retractable syringes

Publications (1)

Publication Number Publication Date
WO2007112476A1 true WO2007112476A1 (fr) 2007-10-11

Family

ID=38562970

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2007/000365 WO2007112476A1 (fr) 2006-04-04 2007-03-23 Améliorations de seringues rétractables

Country Status (1)

Country Link
WO (1) WO2007112476A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5385551A (en) * 1993-09-22 1995-01-31 Shaw; Thomas J. Nonreusable medical device with front retraction
WO1996005879A1 (fr) * 1994-08-18 1996-02-29 Nmt Group Plc Mecanismes de rappel d'aiguille
US6015438A (en) * 1997-11-14 2000-01-18 Retractable Technologies Inc. Full displacement retractable syringe
US6206857B1 (en) * 2000-08-22 2001-03-27 Marina Ling-Ko Chen Syringe with needle retraction arrangement
WO2002087669A1 (fr) * 2001-04-26 2002-11-07 Nmt Group Plc Dispositifs de manipulation de fluide, destines notamment a une utilisation medicale
WO2005058398A1 (fr) * 2003-12-16 2005-06-30 Von Pace Pty Ltd Seringue escamotable

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5385551A (en) * 1993-09-22 1995-01-31 Shaw; Thomas J. Nonreusable medical device with front retraction
WO1996005879A1 (fr) * 1994-08-18 1996-02-29 Nmt Group Plc Mecanismes de rappel d'aiguille
US6015438A (en) * 1997-11-14 2000-01-18 Retractable Technologies Inc. Full displacement retractable syringe
US6206857B1 (en) * 2000-08-22 2001-03-27 Marina Ling-Ko Chen Syringe with needle retraction arrangement
WO2002087669A1 (fr) * 2001-04-26 2002-11-07 Nmt Group Plc Dispositifs de manipulation de fluide, destines notamment a une utilisation medicale
WO2005058398A1 (fr) * 2003-12-16 2005-06-30 Von Pace Pty Ltd Seringue escamotable

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