WO2000041494A2 - Seringue de securite - Google Patents

Seringue de securite Download PDF

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Publication number
WO2000041494A2
WO2000041494A2 PCT/IB2000/000030 IB0000030W WO0041494A2 WO 2000041494 A2 WO2000041494 A2 WO 2000041494A2 IB 0000030 W IB0000030 W IB 0000030W WO 0041494 A2 WO0041494 A2 WO 0041494A2
Authority
WO
WIPO (PCT)
Prior art keywords
barrel
formation
closure member
piston
syringe assembly
Prior art date
Application number
PCT/IB2000/000030
Other languages
English (en)
Other versions
WO2000041494A3 (fr
Inventor
Peter Balfour Dugmore
Anthony Eric Bull
Stanford William Gladwin Reynolds
Original Assignee
Peter Balfour Dugmore
Anthony Eric Bull
Reynolds Stanford William Glad
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 Peter Balfour Dugmore, Anthony Eric Bull, Reynolds Stanford William Glad filed Critical Peter Balfour Dugmore
Priority to AU2000218862A priority Critical patent/AU2000218862A1/en
Publication of WO2000041494A2 publication Critical patent/WO2000041494A2/fr
Publication of WO2000041494A3 publication Critical patent/WO2000041494A3/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    • A61M5/322—Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston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
    • A61M5/50—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
    • 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
    • A61M5/31513—Piston constructions to improve sealing or sliding
    • 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

Definitions

  • This invention relates to a hypodermic safety syringe assembly
  • Another arrangement which is available comprises a cylindrical sleeve which fits around the barrel of a syringe, and which can be extended forward over the needle attached to the syringe after use When the sleeve is fully extended, locking formations on the sleeve engage complemental locking formations formed on or adjacent the end of the syringe barrel so that the sleeve cannot be retracted
  • Drawbacks of protective sleeve arrangements include the fact that in a number of such devices the shield has an open end, which is large enough to allow a user's finger to enter and to contact the needle
  • a directly concomitant disadvantage is the fact that in order to obviate this danger, the needle used has to be substantially shorter than the length of the syringe barrel and shield
  • the extended and locked syringe/sleeve assembly is relatively long and bulky, and uses a substantial additional mass of plastic material compared with the syringe alone Arrangements of this type are also relatively complicated to manufacture, frequently involving a complete re-engineering of the syringe in order for it to co-operate in secure locking engagement with the sleeve Examples are provided by the disclosures in US Patents 5,053,018 and 5,304,149, both of which teach a hypodermic syringe and needle assembly on which is mounted a shield which is movable between a retracted position in which the needle point is
  • An alternative arrangement where the syringe is substantially re-engineered typically proposes a device having a barrel, sheath and piston, the piston being provided with a liquid passageway interconnectable with the barrel
  • the injection of fluid is accomplished by moving the barrel relative to the sheath (as opposed to the more familiar approach of moving the piston relative to the barrel, in conventional hypodermic syringe assemblies)
  • An example of this approach is provided by South African Patent 93/5302, which teaches the automatic and non-discretionary single use safe rendition of a needle
  • hypodermic safety syringe assembly comprising:
  • a cylindrical barrel having a front end defining a first aperture and a rear end defining a second aperture
  • a closure member shaped to engage the barrel at or adjacent the front end thereof to seal the first aperture, and including a hypodermic needle spigot;
  • a piston assembly reciprocally movable within the barrel and including a retractor terminating in a piston formation engageable with the closure member to disengage the closure member from the front end of the barrel so that the spigot and a hypodermic needle attached thereto can be withdrawn into a locked safe position within the barrel after use;
  • detaining means for detaining the spigot and needle in the locked safe position.
  • the closure member includes a barrel engaging formation releasably engageable within a complemental closure member engaging formation at the front end of the barrel, the barrel engaging formation and the complemental engaging formation being arranged in an operating engaged position to prevent pressure exerted on the needle spigot while mounting the needle thereon, or on the needle point in use, from forcing the closure member backwards into the barrel.
  • the closure member includes a piston coupling formation for engaging a complemental coupling formation on the piston to facilitate disengagement of the barrel engaging and complemental closure member engaging formations from one another by withdrawal of the retractor
  • the piston coupling formation and complemental coupling formation are arranged to at least partly disengage the barrel engaging and complemental closure member engaging formations as the piston coupling and complemental coupling formations are urged into engagement with one another so as to facilitate the disengagement of the closure member from the front end of the barrel for withdrawal, together with the piston formation, into the locked safe position within the barrel
  • the engaging and coupling formations are shaped to allow the engaging and disengaging process to be effected during axial reciprocation of the piston assembly within the barrel
  • the coupling and complemental coupling formations as they are engaged, present an outer diameter which is materially greater than the inner diameter of the barrel, resulting in outward elastic deformation of the wall of the barrel at the front end thereof, and concomitant outward releasing distortion on the complemental closure member engaging formation defined in the inner wall of the barrel for facilitating the disengagement of the barrel engaging formation therefrom
  • compressive hoop stress arising from the outward elastic deformation of the wall of the barrel is arranged to enhance the interengagement of the coupling and complemental coupling formations
  • the barrel engaging formation comprises at least one circumferential lip or channel on the closure member acting in sealing cooperative click fit engagement with at least one corresponding respective channel or lip comprising the complemental closure member engaging formation defined in the inner wall of the barrel
  • the barrel engaging formation and complemental closure member engaging formation comprise a bayonet-type fitting, with the first aperture being shaped to receive the fitting, with the piston coupling formation and complemental coupling formation including rotational locking engagement means for allowing the bayonet-type fitting to be rotatably disengaged
  • the first aperture constitutes or is defined within a finger barrier extending inwardly from the front end of the barrel
  • the rotational locking engagement means extends to a locating formation designed to ensure automatic co-operating location of the piston coupling and complemental closure member coupling formations
  • the said rotational locking engagement means may comprise one or more splines and complemental locking keyways forming the rotational locking interface between the piston coupling and complemental closure member coupling formations
  • the splines and keyways preferably form complemental coronae with the keyways conveniently being provided with fairleads to ensure automatic location of the splines when the piston coupling and complemental coupling formations are brought together
  • the rotational locking interface may alternatively be provided by a friction fit which may be further enhanced by keying or roughening the co-operating surfaces of the piston coupling and complemental coupling formations
  • the piston coupling and complemental coupling formations are non-circular in configuration to allow rotational locking engagement of one within the other
  • the barrel engaging formation may include a safety formation to prevent accidental disengagement of the engaging formation whilst the syringe is in use, the safety formation comprising a plurality of bosses or detents in the outer face of a front wall of the barrel alternating with a plurality of slots radiating outwardly from the outer periphery of the first aperture, the bayonet fitting being designed to engage in a click and/or compression fit with the bosses or detents in the engaged position, and to be rotated out of locking engagement therewith in order to be retracted backwardly through the slots
  • the safety formation is provided with rotation delimiting means comprising at least one stop alternating with the bosses described in the outer face of the front wall of the barrel to prevent over-rotation of the bayonet fitting into the operating, locked position in assembly, and to ensure the precise degree of counter-rotation out of locking engagement after the hypodermic procedure has been completed in order to align lugs of the bayonet fitting with the slots prior to retraction therethrough
  • the piston coupling formation comprises a radially outwardly projecting peripheral lip and/or channel
  • the complemental coupling formation comprises a complemental radially inwardly projecting peripheral lip and/or channel
  • the barrel engaging formation and complemental closure member engaging formation comprise a threaded screw-type fitting
  • the detaining means comprises a circumferential channel defined in the inner wall of the barrel at or adjacent its rear end, and an outer peripheral portion of the piston formation and/or closure member which is designed to be held captive within the circumferential channel to lock the needle in the needle safe position the channel being defined between front and rear raised detents or ribs projecting radially inwardly into the barrel cylinder
  • the closure member includes sealing means comprising a sealing disk or flange which acts in sealing engagement with the inner walls of the barrel at or adjacent its front end, with sealing engagement being reinforced by the addition of an upstanding wall or skirt to the flange of the closure member, and sealing engagement extending to the interface between the front face of the disk or flange and the rear face of the front end wall of the barrel
  • the closure member is provided with compression means designed to enhance sealing engagement and locking engagement within the front wall of the barrel, the compression means being provided by the sealing disk being defined as a forwardly tapering cone, the outer periphery of which has a nominally greater diameter than the internal diameter of the barrel, resulting in an outwardly biased disk spring compression which has the effect of holding the outer periphery of the closure member in sealing engagement with the inner circumference of the barrel side wall
  • the angle of the forwardly tapering cone of the sealing disk may be shallower than a rear face of the first aperture-defining front end wall of the barrel resulting in an axially directed disk spring compression for enhancing sealing engagement of the closure member against the barrel front end wall and inner circumference of the barrel side wall
  • second sealing means comprising a first O-ring designed to act in compressive sealing engagement between a front wall of the disk of the closure member and the front end wall of the barrel.
  • supplemental piston sealing means are provided in the form of a second O-ring seated on a rebated annular land defined within the piston formation.
  • the retractor portion of the piston assembly typically comprises a shaft consisting of one or more radially tapered vanes or ribs and being provided with a finger disk at its rear end.
  • the shaft may be provided with a torque resisting formation, the torque resisting formation typically provided by one or more of the vanes having an axial lattice, preferably in the form of a single ribbed repeating Z-section, along the retractor shaft so as to increase resistance to torque applied thereto where rotational unlocking of the closure assembly is necessary prior to retraction of the needle.
  • the stop means of the safety formation of the first aperture is defined to allow only one direction of rotation of the closure member, thus permitting the axially latticed retractor vanes to be arranged so as to provide positively tensioned resistance to torque at the commencement of rotation of the shaft and thus facilitate rotational unlocking of the closure member.
  • the piston is typically designed as an annular disk or flange at the forward end of the piston assembly being designed to act in sealing engagement with the inner walls of the barrel
  • sealing engagement is enhanced by the provision of a wiper ring constituting an outwardly projecting peripheral lip on the skirt or flange of the piston
  • distortion limiting means are provided to limit the distortion of the relative mass of the piston in moulding and also to enhance cooling time of the piston assembly as a whole in the mould
  • the distortion limiting means may comprise a webbed lattice formation defined in a space between a bulkhead or rear piston at the forward end of the retractor shaft and the back face of the piston, thus contributing to a thin and substantially uniform material thickness throughout the piston assembly, with thermally bulky sections eliminated and with cooling times in the mould concomitantly enhanced
  • the webbed lattice formation and the space thereby defined between the piston and the bulkhead may accommodate a sealing formation designed to enhance the sealing capability of the piston in cooperation with the inner walls of the barrel
  • the hypodermic safety syringe assembly includes breakout means for facilitating separation of the retractor from the piston or closure member formation once the closure member and piston have been retracted into the locked needle safe position within the barrel
  • the breakout means may include retractor shear means for ensuring that the retractor shears laterally from the rear face of the piston
  • the breakout means is arranged to facilitate disengagement of the piston coupling formation from the complemental coupling formation, the breakout means being provided by a captive fulcrum defined by a heel of the outer periphery of the piston acting upon any peripheral point on the face of an inlet taper provided at the rear opening of the barrel
  • the retractor includes limiting means to limit the movement of the piston forwardly into the barrel to a position where it is functionally and accurately able to draw up the fluid to be injected but where it is constrained from accidentally engaging the closure member before the hypodermic procedure is completed
  • the limiting means also allows the practitioner discretionally to use the syringe assembly more than once for example when a "cocktail" of drugs is administered consecutively to the same patient without the necessity of using a fresh syringe for each injection
  • the limiting means comprises at least one axial rib or vane of the retractor which is formed with a ridged or expanded shoulder adjacent the rear end thereof, the shoulder being designed to abut against an edge defined by the rear end of the barrel
  • the safety syringe assembly includes at least one fluid venting channel for enabling the escape of fluid entrapped between the piston coupling formation and complemental coupling formation during engagement thereof
  • the safety syringe assembly is typically injection moulded from thermoplastic materials such as polypropylene, or the like BRIEF DESCRIPTION OF THE DRAWINGS
  • Figure 1 shows a top plan view of a first embodiment of a safety syringe assembly according to the invention
  • Figure 2 shows a partly cross-sectional side view of the safety syringe assembly along the lines 2-2 of Figure 1 ;
  • Figure 3A shows a top plan view of a closure member forming part of the safety syringe assembly of Figures 1 and 2;
  • Figure 3B shows a cross-sectional side view of the closure member along the lines 3B-3B of Figure 3A;
  • Figure 3C shows an underplan view of the closure member
  • Figure 3D shows an underplan view of a piston assembly forming part of the safety syringe assembly of Figure 2;
  • Figure 4 shows a detailed cross-sectional side view of a front portion of the safety syringe assembly of Figure 2 with the closure member and piston assembly in the engaged position;
  • Figures 5A to 5C show end-on views in the direction of arrow A of
  • Figure 6A shows a partly cross-sectional side view of the safety syringe assembly with the closure member and needle in the fully retracted engaged position within the barrel;
  • Figure 6B shows a partly cross-sectional side view of the safety syringe assembly with the piston assembly being broken away from the closure member
  • Figure 7 shows a cross-sectional detail of part of the piston and the rear end of the barrel
  • Figure 8 shows a partly cross-sectional side view of a front end of a second embodiment of a hypodermic safety syringe assembly of the invention
  • Figure 9 shows a party cross-sectional side view of a front end of a third embodiment of a safety syringe assembly of the invention.
  • Figure 10 shows a partly cross-sectional side view of a fourth embodiment of a safety syringe assembly of the invention.
  • Figures 11A to 11D show partly cross-sectional side views of the respective forward disengaged, retracted disengaged, forward engaged and retracted engaged positions illustrating a typical injection administering cycle
  • Figures 12A to 12D show cross-sectional details illustrating, stepwise, the manner in which the front end of the piston engages the rear end of the closure member in a click fit;
  • Figure 13 shows a cross-sectional detail of a rear end of the safety syringe assembly in the Figure 1 1 D retracted engaged position,
  • Figure 14 shows a cross-sectional side view of a front end of a fifth embodiment of a safety syringe assembly of the invention.
  • Figure 15 shows a cross-sectional side view of a front end of a sixth eccentric embodiment of a safety syringe assembly of the invention
  • a hypodermic safety syringe assembly 10 comprises a cylindrical barrel 12 having a front end 14 and a rear end 16
  • the front end 14 defines an opening 18 within a finger barrier 20 which is arranged to receive a bayonet fitting 22 on a closure member 24 in the manner described below
  • a second aperture 26 is defined at the rear end of the barrel for receiving a piston assembly 28 which is reciprocally movable within the barrel
  • the piston assembly comprises a front generally disc-shaped piston formation 30, a retractor 32 comprising an array of cruciform vanes 34, 35 and 36 and a rear finger-engageable retractor disc 38
  • the rearmost face of the retractor disc 38 is formed with a series of ribs 40, and the outer circumference of the disc is provided with crenellations 42 for providing gripping assistance
  • the vane 35 and opposed vane 36 have a zig-zag profile to provide the retractor 32 with torsional stability and resistance during twisting thereof
  • a pair of opposed finger-engageable tabs 46 extend outwardly on either side of the
  • the closure member 24 is clearly illustrated in Figures 3A to 3C, and comprises a hypodermic needle spigot 48 extending from a disc-shaped skirt 50 A pair of opposed bayonet lugs 52 intermediate the spigot 48 and the skirt 50 are sized to be received within complemental recesses 54 which are more clearly visible in Figures 5A to 5C An O- ⁇ ng 56 is fitted between the skirt 50 and the lugs 52 to enhance the seal between the skirt 50 and the inner front face 58 of the finger barrier 20
  • a spigot or press stud formation 60 extends rearwardly from the centre of the closure member, and is divided into quadrants 62 by a series of drainage channels 64 Each of the quadrants is formed with circumferential overhanging sawtooth splines 66 which engage in a click fit with a corresponding array of sawtooth splines 68 formed within a socket formation 70 in the front face of the piston formation 30
  • the sealing skirt 50 extends rearwardly at an angle which is less acute or shallower than the rearwardly extending angle of the inner face 58 of the finger barrier 20, thereby providing a relief area 78
  • advancing the closure member to occupy this relief area constitutes a disk spring traverse, to effect a compressive return bias of the sprung skirt 50
  • the front face of the finger barrier is formed with a pair of chamfered bosses 80 over which the lugs are able to ride in the manner illustrated in Figure 5B when the closure member is pushed forward and twisted in the direction of arrow 82 through 90° to the Figure 5C position, in which the lugs 52 locate against stop formations 84 similarly extending from the front face of the finger barrier 20
  • the lugs are located in a compression fit with sufficient axial force to seal the front end of the syringe, and sufficient rotational restraint to prevent accidental disengagement of the bayonet lugs 52 during the hypo
  • the piston assembly 28 is then inserted through the rear opening 26 of the barrel to the position shown in Figure 2 in which the piston formation 30 contacts but does not engage with the closure member 24 and is therefore free to be urged reciprocally backwards and forwards within the barrel 12, and the syringe assembly 10 is then sterilized and packaged
  • the piston assembly 28 is conventionally drawn back by the practitioner to draw the fluid to be injected into the barrel 12, and the injection is administered in the normal fashion, save only that at the end of the procedure the piston formation 30 is fully advanced to a position in which the socket formation 70 defined in the front face of the piston is urged in a snap fit over the press stud formation 60
  • the final position is that illustrated in Figure 4, in which all of the fluid is evacuated from the syringe
  • a supplementary O-r ⁇ ng 86 may be provided for supplementing the seal between an outer peripheral lip 88 of the piston and the inner face of the barrel 12
  • the piston formation 30 is partly hollow, in that it is provided with an H-shaped lattice 90 between a rear
  • FIG. 8 an alternative embodiment of a safety syringe assembly 106 is shown in which a single size closure member 24A can be used to seal off the front end of a first syringe barrel 108 having a larger diameter and a second syringe barrel, which is indicated in broken outline at 1 10 having a smaller diameter, without the need to change the dimensions of the closure member
  • a closure member 24B is shown formed with an integral needle 1 12 with the entire closure member 24B and integral needle 12 being dimensioned so that it can be retracted into the barrel 12, which would not be the case with a conventional separate needle hub assembly, part of which is indicated in broken outline at 114
  • FIG. 10 to 13 a fourth preferred embodiment of a safety syringe assembly 120 of the invention is shown Those components which are similar or identical to the components of the first embodiment are indicated with the same numerals suffixed by an A
  • the barrel 12A has a front opening 18A and a rear opening 26A, with a piston assembly 28A arranged to travel reciprocally within the barrel and terminating in a front piston formation 122 with a front piston disc 123 and a sealing lip or wiper ring 145 projecting outwardly from the forward edge of a piston skirt 147
  • An intermediate retractor 124 comprising a pair of cruciform vanes 126 and 128 extends rearwardly from the front piston formation and terminates in a rear finger disc 130
  • a closure member 132 is formed with a central spigot formation 134 extending from a skirt 136 which is provided with an outer peripheral lip or rib 138, just inwardly of which is formed an inner lip or nb 140 for engaging a complemental channel formation 142 defined towards the
  • the skirt 136 of the closure member 132 and the face of the front piston disc 123 are respectively constituted as backwardly and nominally complemental forwardly inverted cones
  • the closure member 132 is expected to be introduced into the rear aperture 26A of the barrel 12A on a mandrel with a distal pin locating within the fluid channel running centrally through the needle spigot 134, the conical configuration of the closure member 132 allowing forward pressure from the mandrel to cause a nominal decrease in diameter of the skirt 136 during insertion
  • backward pressure_on the closure member 132 when a needle assembly 94A is urged onto the needle spigot 134 or brought into use will tend to expand the skirt 136 thereby enhancing locking and sealing interengagement of the nb 138 in the foremost complemental groove 144
  • the angles of the cones defined by the skirt 136 of the closure member 132 and the face of the piston disc 123 are shallow (typically of the order
  • FIG. 12A the disengaged advanced position of Figure 1 1A is illustrated in more detail
  • the outermost peripheral rib 138 is shown in firm engagement with the complemental channel or groove 144, the rearmost part of which is bordered by a ridge 148 having an outwardly relieving taper of approximately 12°
  • the rear portion of the inner channel 143 is bounded by the radially outwardly directed nb 140
  • the front part of the channel 142 of the piston formation 122 is bounded by a radially inwardly directed rib 152
  • the nb 140 is formed with a trailing face 154 which is angled at 20° relative to the main axis of the syringe barrel
  • the nb 152 is similarly formed with a leading face 156 which is angled at 30° relative to the main axis of the barrel
  • the barrel wall which is typically formed from a softer grade of polypropylene than the piston formation 122 and closure member 132, consequently deforms progressively outwardly in the manner illustrated at 160A, 160B and 160C in Figures 12B to 12D respectively
  • This has the effect of creating a gradually widening gap 162 between the rib 138 and the channel 144, by distorting the ridge 148 radially outwardly in the direction of arrow 164
  • Figure 12D that, once the interengaging rib or lip and channel formations of the closure member 132 and piston formation 122 have fully mterengaged, the resultant outward deformation in the wall of the barrel is sufficient to allow the mated piston formation and closure member to be retracted
  • the lower edges of the vanes 126 and 128 are formed with rectangular notches 172 having respective transverse and axial faces 174 and 176
  • the faces are dimensioned so that, during break off, initial contact adjacent the rearmost rib 170 is made by the axial face 176 and not the transverse face 174 Leverage using the transverse face 174 as the fulcrum will result in an extracting moment tending to pull the piston out of the barrel rather than a sliding/wedging contact on the axial face 176 in which a transverse shear component will predominate at the point of weakness 137
  • the piston assembly will be guided and urged through a tubular jig forwardly into the rear opening 26A of the barrel 12A, with the forward end of the jig being flared to locate within and effect a nominal widening of the inner diameter of the rear of the barrel during insertion and the tubular configuration of the jig itself being designed to protect the frangible connection 137 of the piston assembly 28A from inadvertent shear stress
  • FIG. 14 an alternative embodiment of a safety syringe assembly is shown in which an O-r ⁇ ng seal 180 is provided within a channel 182 formed in the closure member 132 to provide an additional seal between the closure member and the finger barrier 20A
  • FIG. 15 a still further embodiment of a safety syringe assembly is shown in which a closure member 132 is formed with an eccentric spigot 184 and a corresponding eccentric finger barrier 20B and eccentric aperture 18B An arrangement of this type lends itself to the preferred snap-fit embodiment of Figure 10
  • the syringe assembly of the invention meets the objectives of providing a safety syringe which in use conforms closely to conventional and familiar procedures, and which dispenses with the need for a separate needle shield Further, in the preferred embodiment, the assembly can be optionally produced with a central or eccentric needle spigot to meet differing practitioner needs and preferences Because the syringe assembly uses nominally the same material content as standard disposable syringes, it is relatively economical and cost competitive to produce

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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

Cette invention concerne un ensemble seringue hypodermique de sécurité (120) comprenant un fût cylindrique (12A) qui présente une ouverture avant (18A) et une ouverture arrière (26A). Un ensemble piston (28A) est conçu pour coulisser dans le fût. Cet ensemble piston comprend un dispositif de rappel (124) dont l'extrémité constitue la partie avant du piston (122). Un élément de fermeture (132) comporte un ergot central (134) dépassant d'une jupe (136) qui comporte une lèvre extérieure périphérique (138) dont l'intérieur immédiat présente une lèvre interne (140) venant se loger dans un canal correspondant (142) tourné vers la périphérie extérieure de l'extrémité du piston (122). La nervure (138) vient se loger dans la gorge correspondante la plus avant (144) de la face intérieure du fût (12A). En s'emboîtant dans la gorge (142), la lèvre (140) intervient pour désengager l'élément de fermeture de la partie frontale du piston, l'ergot et l'aiguille qui lui est fixée pouvant être rappelés après usage sur une position de verrouillage de sécurité à l'intérieur du fût.
PCT/IB2000/000030 1999-01-11 2000-01-11 Seringue de securite WO2000041494A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2000218862A AU2000218862A1 (en) 1999-01-11 2000-01-11 Safety syringe assembly

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA99/0164 1999-01-11
ZA99164 1999-01-11

Publications (2)

Publication Number Publication Date
WO2000041494A2 true WO2000041494A2 (fr) 2000-07-20
WO2000041494A3 WO2000041494A3 (fr) 2000-09-28

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PCT/IB2000/000030 WO2000041494A2 (fr) 1999-01-11 2000-01-11 Seringue de securite

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AU (1) AU2000218862A1 (fr)
WO (1) WO2000041494A2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001085238A3 (fr) * 2000-05-10 2002-03-21 Peter Balfour Dugmore Ensemble seringue de securite
WO2005099795A1 (fr) * 2004-04-16 2005-10-27 Schoettli Theodor Tete de piston pour seringue d'injection en deux parties
WO2017007792A1 (fr) * 2015-07-06 2017-01-12 Merit Medical Systems, Inc. Corps de seringue renforcé
WO2017081467A1 (fr) * 2015-11-10 2017-05-18 Gbuk Group Limited Seringues et parties intercalaires pour seringues
US11350945B2 (en) 2017-11-13 2022-06-07 Merit Medical Systems, Inc. Staged deflation syringe systems and associated methods

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0636381A2 (fr) * 1993-07-26 1995-02-01 Finestyle Properties Limited Seringue jettable avec une aiguille rétractable
US5401246A (en) * 1991-06-13 1995-03-28 U.S. Medical Instruments, Inc. Retractable syringe with a closed barrel
US5466226A (en) * 1994-07-15 1995-11-14 A.P.I.S. Medical B.V. Injection assembly with a suction needle and a retractable injection needle
US5489272A (en) * 1993-10-18 1996-02-06 Medi Plus Tec Medizinisch-Technische Handelgesellschaft Mbh Injection syringe
EP0818209A1 (fr) * 1995-08-22 1998-01-14 Long-Hsiung Chen Seringue hypodermique de sécurité pour petits dosages
US5810782A (en) * 1993-03-12 1998-09-22 Saito; Yoshikuni Hub for syringe, connecting structure of hub, syringe, syringe assembly and method of assembling syringe assembly

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5401246A (en) * 1991-06-13 1995-03-28 U.S. Medical Instruments, Inc. Retractable syringe with a closed barrel
US5810782A (en) * 1993-03-12 1998-09-22 Saito; Yoshikuni Hub for syringe, connecting structure of hub, syringe, syringe assembly and method of assembling syringe assembly
EP0636381A2 (fr) * 1993-07-26 1995-02-01 Finestyle Properties Limited Seringue jettable avec une aiguille rétractable
US5489272A (en) * 1993-10-18 1996-02-06 Medi Plus Tec Medizinisch-Technische Handelgesellschaft Mbh Injection syringe
US5466226A (en) * 1994-07-15 1995-11-14 A.P.I.S. Medical B.V. Injection assembly with a suction needle and a retractable injection needle
EP0818209A1 (fr) * 1995-08-22 1998-01-14 Long-Hsiung Chen Seringue hypodermique de sécurité pour petits dosages

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001085238A3 (fr) * 2000-05-10 2002-03-21 Peter Balfour Dugmore Ensemble seringue de securite
WO2005099795A1 (fr) * 2004-04-16 2005-10-27 Schoettli Theodor Tete de piston pour seringue d'injection en deux parties
WO2017007792A1 (fr) * 2015-07-06 2017-01-12 Merit Medical Systems, Inc. Corps de seringue renforcé
US10426935B2 (en) 2015-07-06 2019-10-01 Merit Medical Systems, Inc. Reinforced syringe body
WO2017081467A1 (fr) * 2015-11-10 2017-05-18 Gbuk Group Limited Seringues et parties intercalaires pour seringues
US11350945B2 (en) 2017-11-13 2022-06-07 Merit Medical Systems, Inc. Staged deflation syringe systems and associated methods

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