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WO1995007721A1 - Seringue de securite - Google Patents

Seringue de securite Download PDF

Info

Publication number
WO1995007721A1
WO1995007721A1 PCT/GB1994/002013 GB9402013W WO9507721A1 WO 1995007721 A1 WO1995007721 A1 WO 1995007721A1 GB 9402013 W GB9402013 W GB 9402013W WO 9507721 A1 WO9507721 A1 WO 9507721A1
Authority
WO
WIPO (PCT)
Prior art keywords
syringe
demountable
piston
needle
body portion
Prior art date
Application number
PCT/GB1994/002013
Other languages
English (en)
Inventor
John Augustus Dalton Mantell
Original Assignee
Harwill Industries (Pty) Limited
Dummett, Thomas, Ian, Peter
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 Harwill Industries (Pty) Limited, Dummett, Thomas, Ian, Peter filed Critical Harwill Industries (Pty) Limited
Priority to AU77017/94A priority Critical patent/AU7701794A/en
Publication of WO1995007721A1 publication Critical patent/WO1995007721A1/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    • A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston
    • 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
    • A61M2005/3103—Leak prevention means for distal end of syringes, i.e. syringe end for mounting a needle
    • A61M2005/3104—Caps for syringes without 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
    • A61M5/32—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
    • A61M2005/342—Off-center needles, i.e. needle connections not being coaxial with the longitudinal symmetry axis of syringe barrel

Definitions

  • the present invention relates to a safety syringe, notably to a safety syringe having means for retracting the needle after use.
  • syringe for administering a fluid, for example a medicament, to a patient by injecting the fluid through the skin of the patient or for withdrawing a fluid, for example a blood sample, from the patient.
  • a fluid for example a medicament
  • Syringes typically comprise a tubular body within the axial bore of which a piston head is moved axially by means of a plunger so as to dispense the contents of the space within the body ahead of the piston as the plunger is depressed or to suck material into the syringe when the plunger is withdrawn, via a needle which is inserted into or under the skin of the patient.
  • Many forms of syringe are known, but they all have these general features and the term syringe will be used hereinafter to denote generically devices of this type.
  • the needle sheath should be used to break the needle away from the end of the syringe at its mounting so as to render the syringe inoperative by removal of the needle and to reduce the axial length of the syringe which has to be disposed of.
  • the sheath in applying the sheath axially over the exposed needle, the user still runs the risk that he will jab himself with the needle.
  • the syringe is still operative and the needle can be replaced.
  • the present invention provides a syringe comprising an axially extending body portion having an axial piston bore therein extending from a proximal open end to a closed distal end, a piston member journalled for axial movement in the piston bore, a plunger member whose distal end carries the piston member for axial movement of the piston member in the piston bore, said body portion having a needle through which fluid can flow to and/or from the piston bore and mounted upon the body portion by a demountable member whereby the needle can be detached from the body portion and transported axially into the piston bore, there being provided coupling means whereby the piston member or plunger member can be,coupled to the demountable member for transporting the needle axially into the piston bore, characterised in that: a.
  • the coupling means between the piston member or the plunger member and the demountable member is a linearly acting coupling means and at least one of the members forming the coupling means is provided with at least one fluid vent passage whereby fluid entrapped between co ⁇ operating surfaces of the coupling members can escape to allow engagement of the coupling members; b.
  • the said demountable member is secured to the body portion by a linearly acting fastening means located at or adjacent the distal end of the piston bore and comprising at least two inter-engaging circumferentially disposed radially co-operating fastening members, one carried by the body portion of the syringe and the other carried by the demountable member, the external radial dimensions of the demountable member distally beyond the fastening member carried by it being less than the internal radial dimensions of the body portion at the location of the fastening member carried by it, whereby the demountable member can travel axially within the piston bore when said fastening means have been disengaged from one another by relative axial movement of one with respect to the other and said coupling means have been engaged.
  • the invention also provides a method for rendering a syringe safe after use, which method is characterised in that it comprises retracting the needle of the syringe into the piston bore of the syringe whilst retaining the syringe in substantially the position at which the syringe was operated to inject fluid into or to remove fluid from the body of the patient.
  • the fastening members are of a form which is disengaged by axial movement of one member with respect to the other.
  • Such fastening members can take a number of forms, for example triangular radial teeth or ribs which engage in an annular triangular recess.
  • the engaging surfaces of the fastening members be rounded or otherwise sloped to assist sliding of the surfaces over one another as the demountable member is moved axially into the piston bore.
  • other forms of axially disengagable fastening members may be used.
  • one fastening member can be provided by radially deformable arms or the like which carry radial projections, for example barbs or ratchet teeth, which engage an annular flange or rib carried by the other fastening member.
  • the fastening members can be formed from or be coated with a low friction material, for example a PTFE or silicone rubber.
  • the body portion of the syringe is in the form of a cylinder and the internal bore of the cylinder provides the axial piston bore.
  • the bore is closed at its distal end by a transverse end wall which is provided with an aperture.
  • the demountable member carrying the needle is secured axially within the aperture by inter- engagement of the radially inwardly projecting lip of the aperture with a radially inwardly directed annular recess.
  • This recess can be cut into the material of the demountable member or can be provided by a pair of axially spaced apart radially outwardly projecting annular ribs carried by the demountable member forming an annular recess therebetween.
  • annular lip of the aperture formed by suitable cutting away or machining of the end wall of the syringe body and to form the demountable member carrying the needle from a silicone or other pharmaceutically acceptable rubber having an annular groove formed adjacent its proximal end into which the lip of the aperture engages.
  • the relative dimensions of the ribs and recesses can be varied over a wide range having regard to the nature of the material from which they are made and the extent of engagement of the ribs in the recesses.
  • the optimum form and dimensions for the ribs and recesses can readily be determined by simple trial and error tests.
  • syringes are exposed to internal suction forces of from 100 to 450 mms Hg below ambient depending upon the bore of the needle through which the fluid is being drawn and the rate of withdrawal of the piston within the piston bore. It is therefore preferred that the fastening members should disengage when an axial retractive force equivalent to a suction of more than 250, preferably more than 500, mms Hg is applied to the proximal face, of the demountable member exposed to the piston bore when the demountable member is mounted upon the syringe body.
  • annular fastening members require a disengagement suction force which is greater than is acceptable
  • the force required to achieve disengagement can be reduced by forming the fastening members as discontinuous members.
  • a continuous annular rib can be formed as a series of separate sector portions which will usually allow the rib portions to flex and thus disengage at a lower applied force than a continuous annular rib.
  • the lip of the aperture in the end wall of the piston bore is cut with radial slits to form a series of ribs which engage with a continuous annular groove in the demountable member.
  • the lip of the aperture in the distal end wall of the piston bore is orientated in a distal direction and is deformable axially, whereby the application of the axial force to the demountable member causes the lip of the aperture to move radially inwardly and subsequently radially outwardly as the lip is deformed axially.
  • the application of a suction force to the proximal face of the demountable member as the piston is retracted in the piston bore causes the radial grip applied by the aperture lip to increase progressively as the axial suction is applied.
  • the suction force does not exceed the force required to flex the lip beyond the radial orientation so that the demountable member is not released from the grip of the lip.
  • the lip flexes through a truly radial orientation to adopt a proximally directed orientation allowing the radial dimension of the aperture to increase, thus aiding smooth release of the demountable member from the body portion.
  • syringes are formed with a conical distal end in which the end wall cone has an included angle of from 120 to 170°.
  • a form of lip can be achieved by cutting away the apex of the conical end wall at an angle to form a secondary conical end to the syringe which has an included angle which is from 5 to 30° greater than that of the original end wall. The cut removes the apex of the original end wall to form the aperture and forms a lip to that aperture having a radially tapering cross-section which provides the flexible property to the lip. It is particularly preferred to cut the lip with two or more radial slits or cuts outs which divide the lip into a series of radial sectors which assist flexing of the rim as described above.
  • the slits or cut outs are formed symmetrically about the rim, for example at 90, 120 or 180° intervals around the lip.
  • the distal portion of the demountable member extending beyond the end wall of the body portion has an external radial dimension which is smaller than the internal radial dimension of the fastening member, for example the lip of the aperture in the end wall of the syringe body, carried by the body portion.
  • the demountable member is a non-engaging passage through the fastening member carried by the syringe body and requires the application of significant disengaging force only to disengage the fastening members and not for any significant subsequent axial travel of the demountable member. It is therefore preferred that any portion of the fastening member carried by the demountable member which extends distally of the fastening member carried by. the syringe body portion, usually only the distal rim of the annular recess, be kept to a minimum commensurate with adequate securing of the demountable member against distal axial movement when the fastening members are engaged.
  • the internal radial dimensions of the body member, usually the piston bore, proximally of the fastening member carried by the body member are at least a sliding fit greater than the maximum radial dimension of the demountable member, typically of that portion of the demountable member extending proximally of the fastening member. Whilst this portion of the demountable member can be a loose radial fit within piston bore, it is preferred that this portion of the demountable member be a sliding fit or up to 1 mms smaller external diameter than the internal diameter of the piston bore so that the internal walls of the piston bore provide a measure of support and guidance to the demountable member as it is retracted into the piston bore. If desired, the demountable member can carry one or more annular sealing ribs or 0 rings to prevent leakage of the contents of the piston bore past the demountable member.
  • the demountable member carries an axially extending needle through which a fluid can be discharged from the piston bore.
  • the needle can extend fully through the demountable member and form an integral part thereof.
  • the demountable member can be provided with an axial bore therethrough which communicates with an axially extending spigot or luer upon which the needle is mounted using a conventional fixed or separable mounting, preferably a locked mounting to prevent accidental removal of the needle.
  • the luer can be located substantially coincident with the longitudinal axis of the demountable member so that the needle extends along the longitudinal axis of the syringe. However, the luer can be located off centre so that the needle extends axially, but offset from the longitudinal axis of the syringe.
  • the distal end of the plunger member or the distal face of the piston member and the proximal face of the demountable member are provided with coupling members which engage by relative axial movement to provide the positive coupling between the piston/plunger and the demountable member which overcomes the inter-engagement of the fastening members to release the demountable member.
  • the coupling members can take a number of forms, for example inter-engaging barbs carried by one of the piston/plunger or demountable member and a rim or groove carried by the other. However, it is preferred to form a radially extending button or flange on the piston/plunger or the demountable member and a corresponding recess in the other so that the button or flange is a snap fit into the recess.
  • the rim of the recess can be formed from a flexible material to assist engagement of the button or flange into the recess.
  • the recess can be in the form of a blind ended bore or the like and the rim can be provided by a washer or the like having a smaller diameter aperture therein secured over the open end of the bore and through which the button or flange is an interference fit.
  • the recess or the button or flange can be formed with means whereby the engagement between them is one way, whereby the coupling cannot be disengaged once engaged.
  • the button or flange can be under cut on its rearward face and the lip of the rim can have an axial annular rib or skirt which engages in the under cut once the button or flange is engaged fully into the recess.
  • the face of the button or flange which enters the recess is shaped to assist engagement of the flange or button into the recess.
  • the button or flange can present a tapered face to the recess, as when the button or flange has an arrowhead type of axial cross-section.
  • the invention will be described hereinafter in terms of a spherical button head which engages in a substantially congruent recess.
  • the coupling member need not be carried by the piston member but may be carried by or be formed integrally with the distal end of the plunger where the piston member is in the form of an annular member which is mounted upon the distal end of the plunger shaft with the coupling member protruding through the piston member.
  • the coupling members preferably engage with a minimal axial force applied to them, typically of from 1 to 15 lbs per square inch, to minimise discomfort to the patient.
  • the coupling must require an axial disengagement force which exceeds the force required to disengage the fastening members securing the demountable member to the syringe body portion.
  • the axial force required to disengage the coupling members will be at least 10%, preferably at least 100%, greater than the force required to disengage the fastening members.
  • one and/or both of the coupling members are provided with fluid vent ducts or passages whereby fluid can escape from between such opposed faces.
  • one or both of the coupling members can be made from a porous or foraminous material which allows the passage of fluid through the member.
  • the distal end of the piston and the proximal end face of the demountable member are substantially congruent so that the piston buts against the demountable member and expresses substantially all of any fluid in the piston bore as the coupling members engage. This reduces waste due to medicament remaining unused within the piston bore, and the retention of possibly contaminated blood in the syringe which might come into contact with the user or others.
  • the fluid vent(s) provided in the coupling member(s) may also assist escape of any fluid trapped between the opposing faces of the piston and the demountable member.
  • the syringe of the invention thus enables a user to draw fluid into and to discharge fluid from the piston bore of the syringe as with a conventional syringe.
  • the user depresses the plunger to cause the coupling members to engage and thus secure the demountable member to the piston. Since the coupling members are formed so as to vent fluid which might become entrapped between them, the axial pressure required to engage the coupling members can be reduced to a minimum and discomfort to the patient during engagement of the coupling members is reduced.
  • the form and construction of the fastening members securing the demountable member in position allow the demountable member and the needle to be disengaged with a minimum of discomfort to the patient and without the need to rotate the syringe or to apply prolonged and excessive force.
  • the needle can thus be withdrawn into the piston bore whilst the syringe is held in position against the patient's body and without exposing the tip of the needle to the user or others.
  • the syringe can be disposed of safely and in. an axially collapsed form.
  • the syringe Since the needle is within the piston bore, the syringe is not readily re-used by an unauthorised person. However, in order to render the syringe securely disabled, it is preferred to provide some form of locking means whereby the piston carrying the demountable member and the needle can be moved within the piston bore.
  • the piston bore can be provided with internal barbs or teeth which engage the piston of demountable member and are configured so that they allow retraction but not advance of the piston and/or demountable member.
  • Such locking means can act on the plunger shaft and/or on the piston and/or the demountable member if desired.
  • the plunger shaft can be partially cut away to form a weak section which is brought into register with the rim of the proximal end of the piston bore when the locking means described above are engaged.
  • the shaft can then be flexed about the rim of the piston bore to snap the shaft.
  • a weakened portion of the shaft is configured so that opposed ends are formed to the shaft residues upon breaking the shaft which nest into one another.
  • a particularly preferred form of such weakened portion is to form the shaft at this portion as two parallel axial flat arms each having two opposed V sections cut away from the width of the arms. When the arms are broken, the residues of the shaft present the apexes of the triangular ends of the broken arms to each other. This provides an unstable connection between the residues of the arms which readily slide over one another or distort when axial pressure is applied when someone attempts to push the plunger into the piston bore.
  • the syringe of the invention can be readily manufactured using conventional materials and techniques, for example injection of plastics, and can be made by the modification of an existing syringe by adapting the distal end of the syringe body to accept the demountable member and by using a piston member carrying a coupling member in place of a conventional piston member.
  • Figure 1 is an axial cross-sectional view of the syringe with the plunger fully retracted
  • Figure 2 shows the syringe of Figure 1 with the plunger in its fully advanced position and with the coupling members engaged
  • Figure 3 shows the syringe of Figure 2 with the plunger in its fully retracted position having retracted the demountable member with it
  • Figure 4 is a detailed view of the distal end of the syringe of Figure 1
  • Figure 5 is a detail end on view of the coupling member carried by the plunger of the syringe of Figure 1
  • Figure 6 is an axial cross-sectional view of an alternative form of the syringe of Figure 1.
  • the syringe of Figure 1 comprises a cylindrical body portion or barrel 1 having a piston bore 2 and journalled for axial movement therein a piston 3 which is carried upon the distal end of a plunger 4 having a broadened head 5 at its proximal end upon which a user acts to move the piston by depressing or withdrawing the plunger.
  • the proximal, open end, of the barrel 1 has radially extending flanges 6 which can be gripped by a user during use of the syringe.
  • the distal end of the piston bore 2 is closed by a needle mounting member 10 made from a silicone or other suitable rubber or plastic.
  • the piston 3 can be a conventional rubber or similar sliding, sealing fit plug within bore 2 and secured to plunger 4 by any suitable means. As shown in the drawings, it is preferred to form piston 3 as an annular member 30 which fits upon a shaft 31 extending from the distal end of the plunger 4 and is held in place by one or more flanges 32 which extend radially from the shaft 31 and which engage in an annular groove in the annulus of the piston 30.
  • the distal face of the piston 3 is shaped substantially congruent to the proximal face of member 10 so that the piston 3 butts closely against the member 10 and substantially all fluid in the piston bore 2 is discharged from the syringe.
  • the distal end of the plunger shaft extends through the annular piston 30 and terminates in a radial flange 8 having a rounded or tapered distal end face 9.
  • the distal end face of flange 8 is cut with a cruciform vent slit 33 which allows fluid trapped between the distal face of piston 3 and the proximal face of member 10 and under the end face 9 of the flange 8 to escape through member 10 as described below.
  • the slit 33 extends axially through flange 8 and also allows the resultant four sections of the flange 8 to flex radially inwardly to assist passage of flange 8 into recess 11 in member 10 as described below.
  • Member 10 carries on its proximal face a recess 11 which is formed substantially congruently to flange 8 and into which flange 8 is a snap fit.
  • a recess 11 which is formed substantially congruently to flange 8 and into which flange 8 is a snap fit.
  • the flange snap fits into recess 11 under an applied pressure of about 5 to 10 psi.
  • flange 8 requires a substantially higher force to disengage it from recess 11, typically equivalent to a withdrawal force equivalent to a withdrawal pressure of at least about 30 psi.
  • the member 10 comprises a sealing fit plug having the recess 11 formed in its proximal face and having an axial bore 13 extending through the member from the base of the recess 11.
  • the bore 13 communicates with a needle mounting luer 14, which carries a conventional hypodermic needle 15.
  • the needle 15 can be a simple push fit upon the luer 14, but is preferably secured in place by a conventional luer lock mechanism (not shown) .
  • the recess 11 has a radially inwardly directed rim 12 at its proximal end through which the flange 8 is a snap fit passage.
  • the rim 12 can be undercut on its distal side to co-operate with the under cut on the proximal face of flange 8 to retain flange 8 within recess 11 when the plunger is withdrawn.
  • the bore 13 and luer 14 can be located off centre as shown or can be located on the longitudinal axial of the syringe if desired.
  • the member 10 is held in place at the distal end of the piston bore by passing through an aperture in the end wall 20 of the syringe barrel body 1.
  • the lip 21 of the aperture engages with an annular groove or recess 16 formed in the member 10.
  • the body of member 10 is cut away distally of the distal lip 17 of the recess 16 so that the distal portion of the member 10 has smaller radial dimensions than the diameter of the aperture in the end wall 20 of the syringe body.
  • the lip 21 engages the recess 16 as a snap fit which requires a suction of about 500 mms Hg to disengage.
  • the syringe is initially filled with medicament and is in the configuration shown in Figure 1.
  • a user inserts the tip of the needle 15 into the skin of a patient and depresses plunger 4 to discharge medicament through recess 11, bore 13, luer 14 and needle 15 as the piston 3 is moved axially towards the distal end of bore 2.
  • plunger 4 brings flange 8 into engagement with recess 11 in member 10. .
  • Any fluid which remains between the opposed faces of member 10 and piston 3 escapes through the slit 33 cut in flange 8 to discharge through needle 15.
  • any fluid trapped between the engaging faces of flange 8 and recess 11 can escape via slit 33 to the space behind the proximal face of flange 8 and the rim 12 of the recess.
  • registration means can be provided to ensure that one of the slits 33 in flange 8 is in register with bore 13 to allow fluid to escape from the space behind the flange to bore 13 and thus further prevent the build up of pressure within the coupling as it engages.
  • the plunger 4 When the plunger 4 is fully retracted to the position shown in Figure 3, the needle 15 is fully sheathed within the piston bore and the syringe can now be removed from the patient in safety. If desired, an end cap 22 can be inserted into the aperture in the end wall 20.
  • the plunger 4 can be formed with a zone of weakness as shown in Figure 6 at which it can be broken by flexing the plunger about the rim at the proximal end of the barrel 1.
  • the zone of weakness is formed by cutting V portions 23 out of the plunger shaft to leave a narrow section 24 at which the shaft can be broken.
  • the V sections are cut out of two parallel flat arm extensions of the plunger shaft, of which only one is visible in Figure 6.
  • stops or barbs 25 are formed on the inside of the piston bore wall to prevent the plunger and piston from being withdrawn fully from the piston bore.
  • the stops or barbs 25 also prevent the piston member carrying the needle and any residue of the plunger in the piston bore from being moved towards the distal end of the piston bore and thus expose the tip of the needle 15.
  • the residue of the plunger shaft which is broken away from the piston can be inserted through the aperture in the end wall 20 to seal the aperture in place of the cap 22 and possibly also to crush the needle 15.
  • the shaft of the plunger can be flexed to cause the flange 8 to deform due to the slit 33. This allows the flange 8 to disengage from recess 11 allowing the plunger to be withdrawn completely from the piston bore and to be disposed of separately.
  • the lip 21 can be formed with a tapered radial cross-section which allows the lip 21 to flex as shown dotted when a proximally directed force is applied to the member 10. This flexing will enhance the radial grip of lip 21 on member 10 until the lip flexes beyond a true radial position, at which point the lip will loosen its grip on member 10 and assist disengagement of the distal lip 17 of recess 16 from lip 21 to allow member 10 to pass through the aperture in the end wall 20.
  • the distal lip of recess 16 can be formed (as shown) so that it also flexes to assist disengagement of member 10 from lip 21.
  • flange 8 has been shown as being formed as an integral part of the shaft of the plunger 4, it will be appreciated that the flange could be formed as part of the piston 3 .

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  • 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

La présente invention se rapporte à une seringue dans laquelle l'aiguille peut être rentrée dans le corps (1) de la seringue directement à partir du corps du patient sur lequel la seringue a été utilisée. Celle-ci comprend un moyen d'accouplement à actionnement linéaire entre le piston (3) ou la tige (4) du plongeur et le moyen de montage (10) de l'aiguille, le moyen d'accouplement comprenant au moins un passage d'évacuation de fluide empêchant l'accumulation de fluide dans le moyen d'accouplement tandis qu'il est enclenché. Le moyen de montage (10) de l'aiguille est fixé au corps (1) de la seringue par un élément de fixation à actionnement linéaire (16, 21). Une telle seringue ne requiert pas une force excessive pour enclencher le moyen d'accouplement ni pour libérer le moyen de montage (10) de l'aiguille, et il n'est pas non plus nécessaire de tourner les parties de la seringue pour enclencher le moyen d'accouplement ou libérer le moyen de montage, ce qui évite une douleur excessive ou une sensation désagréable chez le patient. Dans la mesure où l'aiguille (15) est rentrée dans le corps (1) de la seringue directement à partir du corps du patient, l'utilisateur de la seringue est exposé aussi brièvement que possible à l'aiguille.
PCT/GB1994/002013 1993-09-15 1994-09-15 Seringue de securite WO1995007721A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU77017/94A AU7701794A (en) 1993-09-15 1994-09-15 Safety syringe

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA936795 1993-09-15
ZA93/6795 1993-09-15

Publications (1)

Publication Number Publication Date
WO1995007721A1 true WO1995007721A1 (fr) 1995-03-23

Family

ID=25583234

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1994/002013 WO1995007721A1 (fr) 1993-09-15 1994-09-15 Seringue de securite

Country Status (3)

Country Link
AU (1) AU7701794A (fr)
WO (1) WO1995007721A1 (fr)
ZA (1) ZA948587B (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19705892C1 (de) * 1997-02-15 1998-11-12 Siekmann Gmbh Universalsicherheitsspritze
DE19825751A1 (de) * 1998-03-12 1999-09-16 Liu Wen Neng Sicherheits-Intravenösspritze mit zurückziehbarer Spezialnadel
ES2171113A1 (es) * 1999-07-19 2002-08-16 Lai Yu-Hau Chang Jeringa de seguridad.
WO2004045683A1 (fr) * 2002-11-19 2004-06-03 Peter Balfour Dugmore Seringue hypodermique de securite
NL1024230C2 (nl) * 2003-09-05 2005-03-08 Medical Patents Ltd Injectiespuit met terugtrekbare inspuitnaald.
WO2005023344A1 (fr) * 2003-09-05 2005-03-17 Medical Patents Ltd. Seringue d'injection a aiguille retractable
US7503905B2 (en) 2005-10-03 2009-03-17 Ultradent Products, Inc. Venting syringe plunger

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4790822A (en) * 1987-12-11 1988-12-13 Haining Michael L Retractable hypodermic safety syringe
WO1989000432A2 (fr) * 1987-07-17 1989-01-26 Assistance Publique Seringue de haute securite non reutilisable
US5000738A (en) * 1989-05-11 1991-03-19 Lavallo Frank Protective syringe with frangible barrel
EP0480862A1 (fr) * 1990-10-09 1992-04-15 Adolfo Ibanez Garcia Seringue à usage unique avec dispositif automatique de sécurité
WO1992021389A1 (fr) * 1991-05-20 1992-12-10 Haining Michael L Seringue a aiguille retractable

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989000432A2 (fr) * 1987-07-17 1989-01-26 Assistance Publique Seringue de haute securite non reutilisable
US4790822A (en) * 1987-12-11 1988-12-13 Haining Michael L Retractable hypodermic safety syringe
US5000738A (en) * 1989-05-11 1991-03-19 Lavallo Frank Protective syringe with frangible barrel
EP0480862A1 (fr) * 1990-10-09 1992-04-15 Adolfo Ibanez Garcia Seringue à usage unique avec dispositif automatique de sécurité
WO1992021389A1 (fr) * 1991-05-20 1992-12-10 Haining Michael L Seringue a aiguille retractable

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19705892C1 (de) * 1997-02-15 1998-11-12 Siekmann Gmbh Universalsicherheitsspritze
DE19825751A1 (de) * 1998-03-12 1999-09-16 Liu Wen Neng Sicherheits-Intravenösspritze mit zurückziehbarer Spezialnadel
ES2171113A1 (es) * 1999-07-19 2002-08-16 Lai Yu-Hau Chang Jeringa de seguridad.
WO2004045683A1 (fr) * 2002-11-19 2004-06-03 Peter Balfour Dugmore Seringue hypodermique de securite
NL1024230C2 (nl) * 2003-09-05 2005-03-08 Medical Patents Ltd Injectiespuit met terugtrekbare inspuitnaald.
WO2005023344A1 (fr) * 2003-09-05 2005-03-17 Medical Patents Ltd. Seringue d'injection a aiguille retractable
US7503905B2 (en) 2005-10-03 2009-03-17 Ultradent Products, Inc. Venting syringe plunger

Also Published As

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ZA948587B (en) 1995-06-26
AU7701794A (en) 1995-04-03

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