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WO1994012229A1 - Seringue - Google Patents

Seringue Download PDF

Info

Publication number
WO1994012229A1
WO1994012229A1 PCT/GB1992/002227 GB9202227W WO9412229A1 WO 1994012229 A1 WO1994012229 A1 WO 1994012229A1 GB 9202227 W GB9202227 W GB 9202227W WO 9412229 A1 WO9412229 A1 WO 9412229A1
Authority
WO
WIPO (PCT)
Prior art keywords
needle
syringe
plunger
axial
piston
Prior art date
Application number
PCT/GB1992/002227
Other languages
English (en)
Inventor
Marius Van Der Merwe
Original Assignee
Merwe Marius V D
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 GB919107910A external-priority patent/GB9107910D0/en
Priority claimed from GB919113821A external-priority patent/GB9113821D0/en
Priority to GB9207537A priority Critical patent/GB2256146B/en
Priority to GB9322710A priority patent/GB2271934B/en
Priority to US07/866,974 priority patent/US5318537A/en
Priority to AU29536/92A priority patent/AU677574B2/en
Priority to SK906-94A priority patent/SK90694A3/sk
Priority to CZ941833A priority patent/CZ183394A3/cs
Priority to JP6512864A priority patent/JPH08500517A/ja
Priority to CA002129133A priority patent/CA2129133A1/fr
Application filed by Merwe Marius V D filed Critical Merwe Marius V D
Priority to EP92923949A priority patent/EP0624103A1/fr
Priority to BR9207076A priority patent/BR9207076A/pt
Priority to PCT/GB1992/002227 priority patent/WO1994012229A1/fr
Priority claimed from CZ941833A external-priority patent/CZ183394A3/cs
Priority to ZA929294A priority patent/ZA929294B/xx
Priority to PL92304717A priority patent/PL304717A1/xx
Publication of WO1994012229A1 publication Critical patent/WO1994012229A1/fr
Priority to NO942783A priority patent/NO942783L/no
Priority to BG98932A priority patent/BG98932A/xx
Priority to FI943581A priority patent/FI943581A7/fi

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
    • 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
    • A61M5/3216—Caps placed transversally onto the needle, e.g. pivotally attached to the needle base
    • 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/32—Needles; Details of needles pertaining to their connection with syringe or hub; Accessories for bringing the needle into, or holding the needle on, the body; Devices for protection of needles
    • A61M5/3205—Apparatus for removing or disposing of used needles or syringes, e.g. containers; Means for protection against accidental injuries from used needles
    • A61M5/321—Means for protection against accidental injuries by used needles
    • A61M5/3243—Means for protection against accidental injuries by used needles being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel
    • A61M5/3245—Constructional features thereof, e.g. to improve manipulation or functioning
    • A61M2005/3253—Constructional features thereof, e.g. to improve manipulation or functioning disconnecting the needle hub from the syringe barrel during removal of the sleeve from the syringe barrel
    • 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
    • A61M5/3278—Apparatus for destroying used needles or syringes
    • A61M2005/3279—Breaking syringe nozzles or needle hubs
    • 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
    • A61M5/50—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
    • A61M5/5013—Means for blocking the piston or the fluid passageway to prevent illegal refilling of a syringe

Definitions

  • the present invention relates to a syringe, notably to a safety syringe in which the syringe plunger and needle are rendered inoperative after use of the syringe.
  • Syringes typically comprise a tubular body within which a piston head is moved axially by means of a plunger from a position at or adjacent the proximal end of the bore within the body to a position at or adjacent the distal end of the bore so as to dispense the contents of the space within the body ahead of the piston via a needle located at or adjacent the distal end of the body which is inserted into or under the skin of a person.
  • a plunger typically comprise a tubular body within which a piston head is moved axially by means of a plunger from a position at or adjacent the proximal end of the bore within the body to a position at or adjacent the distal end of the bore so as to dispense the contents of the space within the body ahead of the piston via a needle located at or adjacent the distal end of the body which is inserted into or under the skin of a person.
  • a syringe has been used to draw blood or other bodily fluid from a patient or to administer a medicament or other material to a patient
  • the syringe can be constructed so that it can be dis-assembled and the individual components cleaned and sterilised for subsequent re-use, this is time consuming and costly. It is therefore the common practice to dispose of the used syringe to waste, for example into a strong plastic container which is disposed of by incineration or burial.
  • the handler may accidentally jab himself with the exposed end of the needle prior to or during insertion into the disposal container.
  • the syringe is disposed of in an operative condition so that it can be retrieved from the disposal container for unauthorised re-use, for example to inject drugs or the like.
  • the plunger should incorporate a frangible section and an axial bore so that after use the plunger can be fully withdrawn and the exposed section of the plunger then broken off at the frangible section.
  • the plunger is thus rendered inoperative and the separated portion can be used as a sheath for the needle which is inserted axially into the axial bore in the plunger.
  • such a design requires the axial insertion of the needle into the bore of the plunger with its attendant risk of the user stabbing himself.
  • the present invention provides a syringe comprising a body portion having an axial piston bore therein and slideably journalled for axial movement therein a piston member, a plunger adapted to engage the piston member for axial movement of the piston member in the piston bore, and a needle through which the contents of the body portion are to be discharged upon axial movement of the piston member, characterised in that: a. the needle is mounted or is adapted to be mounted upon the body of the syringe by a breakable or demountable member whereby the needle can be detached from the syringe body; b.
  • the syringe is provided with a needle receiving member having an axially extending needle receiving chamber therein and having an axial aperture in a wall thereof through which the needle can be inserted at least in part transversely: and c. the needle receiving member incorporates means for demounting the needle from the syringe body.
  • the invention also provides a needle receiving member adapted to separate a needle from a syringe and to contain the said needle, the needle receiving member being characterised in that it comprises: a. an axially elongated member having an axially extending needle receiving chamber therein and having an axial aperture in a wall thereof through which the needle can be inserted at least in part transversely: and in that b. the needle receiving member incorporates means for separating the needle from a syringe body.
  • the plunger of the syringe is one which incorporates a one use connection within the length of the plunger or between the operative (distal) end of the plunger and the piston member.
  • the one use connection is typically provided by a member which provides a positive connection on the forward or discharge stroke of the plunger, but which can be broken or ruptured when the plunger is urged against the forward limit of its travel' or is withdrawn, so that the plunger cannot withdraw the piston member axially from the hollow body, thus preventing re-assembly of the plunger and re ⁇ use of the syringe after the one use connection is broken or otherwise disabled.
  • the one use connection be a frangible section in the length of the plunger or at the distal end thereof which is either foreshortened axially when the connection is broken and/or is configured so that relative rotation of the remaining portions of the plunger about their common longitudinal axis allows the opposing faces of the broken frangible section to nest within one another whereby the plunger can be foreshortened axially.
  • syringes having such a form of plunger are novel and the invention therefore also provides a syringe comprising a body portion having an axial piston bore therein and slideably journalled for axial movement therein a piston member, a plunger adapted to engage the piston member for axial movement of the piston member in the piston bore, the plunger being provided with a one use connection in the length thereof or at or adjacent the distal end thereof whereby the drive between the plunger and the piston member can be disabled, characterised in that the one use connection is a frangible section in the length of the plunger or at the distal end thereof configured so that disabling of the one way connection by breaking the frangible section enables the axial length of the plunger to be decreased.
  • the frangible section is one which is either foreshortened axially when the connection is broken and/or is configured so that relative rotation of the portions of the broken plunger about their common longitudinal axis allows the opposing faces of the broken frangible section to nest within one another whereby the plunger can be foreshortened axially.
  • the bore of the cylinder within which the plunger is journalled is provided with one or more inwardly projecting ribs or the like which engage in a corresponding circumferential recess or groove on the plunger, so that the axially foreshortened plunger can be inserted into the cylinder and locked within the cylinder by the mutual engagement of the projections and the recesses or groove(s) when the free (proximal) end of the foreshortened plunger is pushed into the bore, preferably so as to leave no free end exposed to a user.
  • Such foreshortening of the plunger thus renders the syringe wholly inoperative as well as providing a compact unit for disposal.
  • the projections on the syringe body can be located at the proximal end of the bore or syringe body, so that they engage the proximal end face of the foreshortened plunger rather than a recess formed in the side wall of the plunger.
  • the plunger may carry radially outwardly projecting members which engage a recess or circumferential groove in the wall of the bore.
  • Such projecting members can be sharpened or acutely angled, for example to form sharp teeth or the like, which cut into the wall of the bore to inhibit removal of the plunger once the teeth have engaged to wall of the piston bore.
  • the projections can be mounted on lever members which are actuated by the user to deploy the projecting members to engage with and cut into the wall when the plunger has been pushed fully home in the piston bore.
  • the plunger provides the needle receiving member so that the whole syringe can be broken down after use to demount the needle and house it in the axial chamber within the broken off portion of the plunger via insertion transversely through the axial slot in the wall of the plunger and the plunger/needle then inserted into the bore of the syringe and pressed fully home therein so that the plunger containing the needle is locked within the cylinder.
  • the syringe of the invention can be of conventional design and construction.
  • a radially symmetrical syringe having a cylindrical bore within which is journalled a piston for reciprocation by means of a plunger whose proximal end provides a thrust pad or button and whose distal end carries or bears against the piston, and from which fluid is discharged when a uses depresses the plunger to eject fluid in the bore of the syringe through an axially orientated needle carried on an axial outlet through the terminal cross wall of the syringe.
  • the needle can be mounted on the syringe by means of a breakable mounting and the end of the needle receiving member which is to be closest to the syringe during removal of the needle (the proximal end) can be provided with a metal or other strong rim which bears against the mounting as the needle receiving member containing the needle is flexed about the longitudinal axis of the syringe to cause the mounting or the needle to break. It is preferred to incorporate a break line in the plastic moulding which forms the mounting of the needle, for example a circumferential score or thinning in the wall of the mounting, so that the needle can be detached as a whole from the syringe.
  • the needle receiving member may be desirable to provide the needle receiving member with means by which the needle is held firmly within the needle receiving member and axial movement of the needle with respect to the needle receiving member is minimised.
  • the means for holding the needle can, for example, be provided by a tight fit between the needle and at least part of the internal walls of the needle receiving chamber or by a resilient member through which the shank of the needle passes as a tight fit so as to minimise axial movement of the needle within the receiving member during flexing of the needle.
  • the needle can be demountably mounted on the syringe body, for example by way of a push fit, screw or other mounting which is engaged by the needle receiving member.
  • the mounting can incorporate a breakable element as described above.
  • the mounting is a push fit of a needle support block upon an axial spigot outlet to the syringe body so that the needle as a whole is detached axially from the syringe body.
  • the needle receiving member is provided by an axially elongated hollow member which has a side, axial needle entry port whereby the user moves the needle laterally with respect to the receiving member when inserting the needle into the receiving means, thus reducing the risk of jabbing himself axially with the needle tip.
  • the needle receiving member is provided with suitable separating means located at or adjacent the proximal end of the needle entry port.
  • the needle receiving member incorporates a suitably shaped socket at its proximal end which engages a correspondingly shaped shoulder on the needle mounting so that they mounting can be unscrewed when the needle has been inserted into the needle receiving member.
  • the mounting of the needle is by way of an axial push fit upon a boss or spigot at the distal end of the syringe body and the mounting is provided with one or more radial projections. These are to be engaged by a ramp or cam ⁇ like member at or adjacent the proximal end of the needle receiving member as the needle receiving member moves transversely with respect to the needle mounting. This action moves the needle mounting axially with respect to the syringe so that the needle is separated axially from the syringe.
  • the radial projections on the needle mounting can be porovided by the circumferential shoulder at the proximal end of a conventional mounting block carrying the needle or can be additional projections moulded into the mounting of the needle. It will be appreciated that the radial projections on the needle mounting can be sloped to provided the ramp or camming member and that the projections on the needle receiving member need not then be ramped or cammed. It will also be appreciated that the same action can be achieved by means of an axially inclined groove which is engaged by a rib. For convenience, this form of separation of the needle from the syringe will be described hereinafter in terms of a ramp member carried at or adjacent the proximal end of the needle receiving member engaging with the proximal end shoulder of the needle mounting.
  • the axial needle entry port in the wall of the needle receiving member need not extend the full length of the needle receiving chamber within the needle receiving member, but may be axially shorter than the needle itself so that the user inserts the tip or distal portion of the needle transversely into the axial entry port and then moves the needle axially to complete the insertion of the needle into the needle receiving chamber.
  • the entry port extend for at least 50%, preferably from 75 to 100% of the axial length of the needle to be inserted through it, so that insertion of the needle is achieved substantially wholly by a transverse movement between the syringe and the needle receiving member.
  • the needle receiving chamber is orientated axially within the needle receiving member and extends for the full axial length of the needle it is to receive.
  • the needle entry port in a side wall of the chamber need not extend for the full length of the chamber so that a needle once located within the chamber can not readily escape through the entry port.
  • the chamber can be merely a cylindrical bore within which the needle is a loose fit.
  • the needle receiving member incorporate means which positively engage the needle or its mounting so that once inserted into the chamber, the needle cannot readily be removed.
  • the proximal end of the chamber can have an internal rib which engages that groove to retain the needle in the chamber once it has been broken away from the syringe.
  • part of the chamber can be formed as a tight fit upon the needle so that the needle is positively gripped and held within the chamber.
  • the needle receiving member can be a simple cylindrical member having a blind ended axial bore forming the needle chamber and with the axial entry port formed in one wall thereof.
  • the distal end of the syringe body and the proximal end of the needle receiving member can have co-operating faces whereby they can pivotally engage one another.
  • the needle receiving member is offered up to the distal end of the syringe and the operating faces mated to one another.
  • the syringe and needle receiving member are then pivoted about the engagement point to bring the needle into engagement with the axial entry port. Due to the shapes of the co-operating faces, registration of the shank of the needle with the port is facilitated.
  • the end face of the syringe body can be formed with a rounded face and the proximal end face of the needle receiving means can carry a corresponding curved portion so that it seats upon the curved face of the syringe and adopts a specific orientation with respect to the syringe when the opposed curved surfaces are correctly engaged.
  • the needle will follow a path defined by the shapes of the opposed faces and can thus be guided accurately into the needle entry port.
  • the plunger for the syringe preferably incorporates a one use connection with the piston of the syringe so that the plunger and the needle are both disabled after use of the syringe.
  • the piston can be formed integrally with the shaft of the plunger and the one use connection achieved by weakening the shaft of the plunger at the connection to the piston so that it breaks upon completion of the forward, delivery stroke of the plunger.
  • the one way connection can be disconnected as the plunger is withdrawn from the syringe.
  • Many forms of one way connection may be employed, see for example those described in US Patent No 4 923 443.
  • connection be one which enables an axial foreshortening of the plunger shaft to be achieved when the residual plunger shaft is re-inserted into the piston bore.
  • shaft of the plunger be partially cut away at the one use connection, for example by cutting transverse circular or other shaped portions out of the plunger shaft, so that when the connection is broken crenellated, cusped or other co-operating shaped ends to the two residual parts of the shaft are formed.
  • the needle can be broken off or detached using a separate needle receiving member which is then discarded or can be inserted into a suitably shaped bore in the plunger body.
  • the plunger shaft be formed with an internal bore which accommodates the needle as described above for the needle receiving member, and that this portion of the plunger shaft be withdrawn from the syringe when the one use connection with the piston is broken. In this way, the residue of the plunger shaft can be used to demount and house the needle in the same manner as described above for the needle receiving member.
  • the bore within the plunger shaft can extend from the proximal end of the plunger, ie.
  • the proximal end of the plunger be formed with a radially extending shoulder to provide a thrust head upon which a user presses to depress the plunger within the piston bore of the syringe. It is also preferred that this shpulder be provided with a radial slot in register with the axial needle entry port in the wall of the plunger so as to assist location of the needle with the axial entry port.
  • the syringe body is provided with locking means whereby the broken off proximal portion of the plunger can be pushed fully home into the bore of the syringe due to its axial foreshortening and locked within the bore so that it can not subsequently be removed in an attempt to reconstruct the syringe.
  • the syringe is rendered inoperative by destruction of the plunger shaft and removal of the needle, and the inoperative syringe is reduced to an axially foreshortened construction for disposal with the needle safely sheathed within the plunger body.
  • the syringe of the invention can readily be manufactured by simple modification of the plunger as used in a conventional syringe so as to provide the one use connection and the bore in the plunger to receive the needle.
  • the syringe body will typically be made from a plastic moulding having the needle extending axially therefrom and secured to the syringe body by a detachable or breakable mounting.
  • Figure 1 is a diagrammatic perspective view of the plunger and piston for use in the syringe
  • Figure 2 is an axial cross-sectional view through a syringe incorporating the plunger and piston of Figure 1 (not shown in section) at the end of the delivery stroke of the piston
  • Figure 3 is an axial cross-sectional view of the syringe and plunger of Figure 2 in its disabled form, with the needle demounted and housed within the plunger which has been axially foreshortened and re-inserted into the piston bore after use
  • Figure 4 shows in diagrammatic side views five stages in the operation of the syringe of Figures 2 and 3
  • Figure 5 shows in axial cross-section the operation of a preferred form of needle removal mechanism at the proximal end of the needle receiving member
  • Figure 6 shows in diagrammatic axial cross-section an alternative form of the mechnism for locking the foreshortened plunger within the
  • the syringe shown in Figures 2, 3 and 4 comprises a generally cylindrical tubular body 1 having a radial shoulder or finger grip projections 2 at the open, proximal, end thereof and an axial piston bore extending from the open end.
  • the other, distal, end of the piston bore is closed by a transverse end wall 3 having an axial outlet spigot 4 upon which is mounted a hypodermic needle 5.
  • the needle can be mounted as a push fit upon spigot 4 by means of a needle mounting 6.
  • the needle can be moulded into the spigot 4 during manufacture of the syringe.
  • the spigot 4 or the needle mounting can be formed with a circumferential score or groove to provide a ring of weakness at which the needle 5 can be broken away from the syringe.
  • a piston 10 which is driven axially by a plunger 11 which, in normal use, extends beyond the open end of the syringe body 1 to provide a radially enlarged thrust head 12 against which a user pushes to move the piston axially within the piston bore.
  • the plunger shaft preferably also acts as the receptacle for the needle 5 when it is detached from the syringe body.
  • the plunger shaft 11 has an axial bore 20 therein which is adapted to act as the needle receiving chamber.
  • the plunger shaft 11 can be solid with the bore 20 formed axially therein, but is preferably hollow as shown with an axial needle entry port 30 in the side wall thereof which communicates with the central axial bore 20.
  • the entry port 30 feeds the needle radially into the axial bore 20 within the shaft 11 and the radially outward lips of the entry port can be belled to assist location of the needle into the port 30.
  • the bore 20 can extend axially from the distal or proximal end faces of plunger shaft 11 and the radially projecting thrust head 12 can have a radial slot 13 formed therein in register with the proximal end of port 30 to aid correct location of the needle 5 with respect to the entry port 30 when the plunger is used to remove and house the needle 5 as described below.
  • the needle 5 is to be separated from the syringe by snapping the needle mounting 5 or spigot 4 at the line of weakness introduced by the circumferential groove in the needle mounting, as shown in steps 3 and 4 of Figure 4, it is preferred to form the bore 20 as a close fit upon the needle 5 so that the needle is held firmly within the bore. It is also preferred to form the proximal end of the bore with a sharp rim or lip 21 about which the mounting or spigot flexes so as to assist breaking of the mounting or spigot at the desired point.
  • the proximal end of the plunger bore 20 is provided with at least one transverse ramp member 22 as shown in Figure 5.
  • a second ramp member 23 is provided axially further into the bore 20 to trap the circumferential bead 24, usually present at the proximal end of a conventional needle mounting 6, between the opposed faces of the two ramps 22 and 23.
  • the two ramps are each cut with a radial slot 25 annd 26 which are a close fit upon the axial portions of the spigot 4 and the needle mounting 6 respectively so that the upper, distal, face of the proximal ramp 22 bears against the underside, proximal face, of the mounting 6 and the distal ramp
  • the proximal end of the plunger shaft 11 carry an external circumferential groove 40 or a circumferential rib 41 which will engage with a circumferential rib 42 at the lip of the open end of the piston bore to retain the foreshortened piston shaft within the piston bore as described below.
  • the needle 5 is retained in the chamber 20 within the plunger shaft 11.
  • the chamber 20 can be provided by a separate component which has the features described above for removing the needle from the syringe and retaining it captive within the needle chamber 20.
  • the shaft of the plunger be formed so that the shaft can be broken to disable the plunger. This also allows at least part of the plunger to be removed from the piston bore and presented to the needle so that the needle can be inserted into the chamber 20 within the shaft of the plunger via the entry port 30.
  • the shaft and needle are then preferably re-inserted into the piston bore in the syringe body with the shaft of the plunger axially foreshortened, the engagement of the groove 40 with, and/or the snap passage of rib 41 past, rib 42 serving to retain the foreshartened plunger within the piston bore to inhibit any attempt to re-assemble the syringe for subsequent re-use.
  • the plunger 11 is preferably provided at or adjacent the piston 10, ie. at its distal end, with a one time use connection 14.
  • This can be a frangible connection which is broken when the piston butts against the end wall 3 and pressure is applied to the connection as the user attempts to depress thrust head 12 further.
  • a particularly preferred form of one use connection is provided by means of a series of radial bores, apertures or cut outs 15 through the plunger shaft 11 adjacent the piston 10, which remove a substantial portion of the material of the shaft at this point. This forms a weak point at which the shaft 11 can be broken by flexing the shaft.
  • the piston end of the plunger shaft can be formed with an axial recess so that the wall thickness of the shaft is reduced at this end, and the transverse bores or cut outs 15 are formed in this thinner wall area of the shaft.
  • the cut outs 15 are configured so that they will allow the broken ends of the plunger shaft to nest upon one another and thus achieve a degree of axial foreshortening of the plunger shaft.
  • the cut outs can be circular or ovals, triangles, rectangles or other axially elongated shapes which provide a narrow remainder to the plunger wall between adjacent cut outs. When the plunger shaft is broken, the break will occur at these narrow remainders to give a crenellated end to each of the sections 11 a and 11 b of the plunger shaft.
  • the crenellations on one end can be moved out of register with those on the other end by relative rotation of the two ends about the longitudinal axis of the plunger sections so that the raised portions or crowns of one crenellated end will nest in the troughs of the other crenellated end to achieve the axial foreshortening of the plunger shaft.
  • the plunger shaft 11 is provided with one or more radial projections 16 on the shaft portion 11 b which is located distally of the one use connection 14. These are to engage the radial rib 42 described above to prevent the whole of the plunger being withdrawn from the piston bore.
  • the engagement of the ribs 42 and 16 also serves to locate the weak point in the shaft approximately in register with the rim of the open end of the piston bore which can then act as the fulcrum about which the plunger shaft is flexed to break the shaft.
  • the syringe is assembled by mounting the needle 5 upon the syringe body and inserting the plunger 11 and piston 10 into the piston bore in the syringe body - step 1 in Figure 4.
  • the bore 20 and the axial needle entry port 30 in the plunger shaft 11, the needle, its mounting and the remainder of the syringe can be of conventional design and construction.
  • the piston 11 In use, the piston 11 is withdrawn in the piston bore to suck medicament or other fluid into the piston bore in the conventional manner.
  • the fluid is injected in the conventional manner by depressing the thrust head 12 to drive the piston 10 axially.
  • the plunger shaft 11 is withdrawn until the projections 16 on the shaft 11 engage the rib 42 at the lip of the piston bore. The shaft is then flexed laterally to cause it to break at the ring of weakness introduced by the cut outs 14 - step 2 in Figure 4.
  • the proximal section 11 a of the shaft 11 is then applied transversely to the needle end of the syringe so that the needle 5 is inserted transversely into the bore 20 - step 3 in Figure 4.
  • the plunger section 11 a is flexed as shown in step 3 of Figure 4 about the longitudinal axis of the needle to break the spigot 4 or the needle mounting 6 as shown in step 4 of Figure 4 to leave the needle 5 and the residue of the mounting or spigot held in the bore 20 of the shaft section as shown in Figure 3.
  • the ramp 2 engages the underside of the needle mounting 6 and moves the mounting 6 axially with respect to the spigot 4 as the needle is inserted transversely into the axial slot 30. Where the second ramp 23 is present, this can trap the mounting against the upper face of ramp 22 and thus retain the needle and its mounting securely within the bore 20.
  • the shaft section Ila carrying needle 5 in bore 20 is then re ⁇ inserted into the piston bore of the syringe body 1.
  • the axially projecting portions are out of alignment with one another, and the axial length of the plunger shaft 11 can be reduced to allow the plunger to be inserted far enough axially into the piston bore to allow rib 42 at the lip of the piston bore to engage in the groove 40 in the plunger shaft and thus lock the shaft within the piston bore - step 5 in Figure 4 and as shown in Figure 3.
  • the proximal end of the plunger is formed with two or more sharp radial teeth 50.
  • lateral pressure on the thrust head 12 flexes the end of the plunger shaft and allows teeth 50 to retract radially and thus fit into the proximal end of the piston bore.
  • the end of the plunger shaft expands radially causing the teeth 50 to bite into the wall of the piston bore and thus lock the plunger shaft within the bore.
  • the teeth 50 may not be retracted and the plunger forced axially into the piston bore to engage the teeth 50 with the inner face of the piston bore.
  • the syringe provides its own needle breaker and receptacle means, which aids the safe disposal of the needle and syringe, as well as rendering the syringe inoperative by breaking the plunger shaft.

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Environmental & Geological Engineering (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Abstract

L'invention concerne un élément de logement d'aiguille conçu pour permettre de séparer l'aiguille (5) de la seringue et pour contenir ladite aiguille. Cet élément présente les caractéristiques suivantes: a) il est constitué d'un élément axialement allongé présentant une chambre recevant l'aiguille s'étendant axialement, et une ouverture axiale dans une de ses parois, par laquelle on peut introduire l'aiguille au moins transversalement; b) il comporte également des moyens (22, 23, 26) de séparation de l'aiguille du corps de la seringue. L'invention se rapporte également à une seringue dont le plongeur (11) qui commande le piston (10) est conçu de manière à former l'élément recevant l'aiguille, de préférence dans la partie de l'axe du plongeur pouvant être séparée du reste de l'axe au moyen d'un raccord cassable à usage unique (14) de façon que la seringue puisse être rendue hors d'usage par le retrait de l'aiguille et la rupture du mécanisme du plongeur.
PCT/GB1992/002227 1991-04-13 1992-12-01 Seringue WO1994012229A1 (fr)

Priority Applications (16)

Application Number Priority Date Filing Date Title
GB9207537A GB2256146B (en) 1991-04-13 1992-04-07 Syringe
GB9322710A GB2271934B (en) 1991-04-13 1992-04-07 Syringe
US07/866,974 US5318537A (en) 1991-04-13 1992-04-10 Syringe
ZA929294A ZA929294B (en) 1991-04-13 1992-12-01 Syringe.
PL92304717A PL304717A1 (en) 1992-12-01 1992-12-01 Syringe
BR9207076A BR9207076A (pt) 1992-12-01 1992-12-01 Membro receptor de agulha adaptado para separar uma agulha de uma seringa e para conter a agulha e seringa
CZ941833A CZ183394A3 (en) 1991-04-13 1992-12-01 Syringe
JP6512864A JPH08500517A (ja) 1992-12-01 1992-12-01 注射器
CA002129133A CA2129133A1 (fr) 1991-04-13 1992-12-01 Seringue
AU29536/92A AU677574B2 (en) 1991-04-13 1992-12-01 Syringe
EP92923949A EP0624103A1 (fr) 1991-04-13 1992-12-01 Seringue
SK906-94A SK90694A3 (en) 1992-12-01 1992-12-01 Syringe
PCT/GB1992/002227 WO1994012229A1 (fr) 1991-04-13 1992-12-01 Seringue
NO942783A NO942783L (no) 1991-04-13 1994-07-26 Spröyte
BG98932A BG98932A (en) 1992-12-01 1994-07-28 Syringe
FI943581A FI943581A7 (fi) 1991-04-13 1994-08-01 Ruisku

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
GB919107910A GB9107910D0 (en) 1991-04-13 1991-04-13 Safety syringe
GB919113821A GB9113821D0 (en) 1991-06-27 1991-06-27 Syringe
GB9207537A GB2256146B (en) 1991-04-13 1992-04-07 Syringe
PCT/GB1992/002227 WO1994012229A1 (fr) 1991-04-13 1992-12-01 Seringue
CZ941833A CZ183394A3 (en) 1991-04-13 1992-12-01 Syringe
CA002129133A CA2129133A1 (fr) 1991-04-13 1992-12-01 Seringue
ZA929294A ZA929294B (en) 1991-04-13 1992-12-01 Syringe.

Publications (1)

Publication Number Publication Date
WO1994012229A1 true WO1994012229A1 (fr) 1994-06-09

Family

ID=27560981

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1992/002227 WO1994012229A1 (fr) 1991-04-13 1992-12-01 Seringue

Country Status (4)

Country Link
EP (1) EP0624103A1 (fr)
FI (1) FI943581A7 (fr)
GB (2) GB2256146B (fr)
WO (1) WO1994012229A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2139737C1 (ru) * 1997-10-21 1999-10-20 Таранов Игорь Викторович Шприц-тюбик
JP3450011B2 (ja) 1994-12-20 2003-09-22 ウェストン メディカル リミテッド 無針注射器カートリッジのための充填装置
CN100364624C (zh) * 2004-12-25 2008-01-30 李健全 一次性自毁式注射针头
US9205205B2 (en) 2008-11-26 2015-12-08 Becton, Dickinson And Company Single-use auto-disable syringe

Families Citing this family (14)

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SE510148C2 (sv) * 1994-04-14 1999-04-26 Pharmacia & Upjohn Ab En icke återanvändbar injektionsanordning samt sätt för dess tillverkning
GB2350317B (en) 1996-07-15 2001-01-10 Star Syringe Ltd Apparatus for making syringes
GB9700789D0 (en) * 1997-01-16 1997-03-05 Butters Edward Syringe
DK1064039T3 (da) * 1998-07-29 2004-03-01 Becton Dickinson Co Engangssprøjte
US8202257B2 (en) 1998-07-29 2012-06-19 Becton, Dickinson And Company Splatter prevention mechanism for a syringe
US7798993B2 (en) 1998-07-29 2010-09-21 Becton, Dickinson And Company Single use syringe
US6361525B2 (en) 1998-07-29 2002-03-26 Becton Dickinson And Company Single-use syringe
US6217550B1 (en) 1998-07-29 2001-04-17 Becton, Dickinson And Company Single-use syringe
US6599269B1 (en) 1999-12-03 2003-07-29 Becton Dickinson And Company Single-use syringe
BR0212777A (pt) * 2001-09-24 2004-10-13 Becton Dickinson Co Seringa de uso único e dispositivo de travamento de haste de êmbolo para a mesma
US6986756B2 (en) 2001-09-24 2006-01-17 Becton, Dickinson And Company Single use syringe and plunger rod locking device therefor
SE0301667D0 (sv) 2003-06-04 2003-06-04 Medsafe Asa Disposable injection syringe
GB201118659D0 (en) 2011-10-28 2011-12-14 Tensar Technologies Ltd Mesh structure, production and uses thereof
US9415172B2 (en) 2012-04-19 2016-08-16 Ultimed, Inc. Safety syringe and needle shield

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EP0315306A1 (fr) * 1987-09-26 1989-05-10 Hans Skovgard Jensen Seringues et aiguilles à sonde
WO1991001152A1 (fr) * 1989-07-18 1991-02-07 Tri/West Systems, Inc. Support de montage pour tige de plongeur de seringue
US5004460A (en) * 1988-01-07 1991-04-02 Gimeno Carlos V Non-reusable syringe
WO1992012748A1 (fr) * 1991-01-24 1992-08-06 Paul Giles Miller Protection de pointes d'aiguilles

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US4270536A (en) * 1979-10-01 1981-06-02 Lemelson Jerome H Disposable syringe
US4710170A (en) * 1987-02-12 1987-12-01 Habley Medical Technology Corporation Anti-needle strike and anti-drug abuse syringe
GB2214082A (en) * 1988-01-06 1989-08-31 Guo Wen Fu Syringe
WO1989008468A1 (fr) * 1988-03-17 1989-09-21 Terumo Kabushiki Kaisha Seringue
US4944397A (en) * 1988-05-23 1990-07-31 University Medical Center, Inc. Disposable covered needle for syringe
US4917243A (en) * 1988-08-16 1990-04-17 The Board Of Regents, University Of Texas System Needle disposal device
WO1991003269A1 (fr) * 1989-08-28 1991-03-21 Townsend Controls Pty. Ltd. Seringue de securite
WO1991008786A1 (fr) * 1989-12-18 1991-06-27 Wayne Crawford Gaine pour aiguille hypodermique
US5000736A (en) * 1990-03-22 1991-03-19 Harry Kaufhold, Jr. Disposable syringe with automatic needle retraction

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0315306A1 (fr) * 1987-09-26 1989-05-10 Hans Skovgard Jensen Seringues et aiguilles à sonde
US5004460A (en) * 1988-01-07 1991-04-02 Gimeno Carlos V Non-reusable syringe
WO1991001152A1 (fr) * 1989-07-18 1991-02-07 Tri/West Systems, Inc. Support de montage pour tige de plongeur de seringue
WO1992012748A1 (fr) * 1991-01-24 1992-08-06 Paul Giles Miller Protection de pointes d'aiguilles

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0624103A1 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3450011B2 (ja) 1994-12-20 2003-09-22 ウェストン メディカル リミテッド 無針注射器カートリッジのための充填装置
RU2139737C1 (ru) * 1997-10-21 1999-10-20 Таранов Игорь Викторович Шприц-тюбик
CN100364624C (zh) * 2004-12-25 2008-01-30 李健全 一次性自毁式注射针头
US9205205B2 (en) 2008-11-26 2015-12-08 Becton, Dickinson And Company Single-use auto-disable syringe

Also Published As

Publication number Publication date
GB2271934A (en) 1994-05-04
EP0624103A1 (fr) 1994-11-17
GB2256146A (en) 1992-12-02
GB9322710D0 (en) 1994-02-09
FI943581A0 (fi) 1994-08-01
GB2271934B (en) 1995-02-15
GB9207537D0 (en) 1992-05-20
GB2256146B (en) 1995-02-22
FI943581A7 (fi) 1994-09-30

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