Means For Preventing Accidental Displacement Of Piston Patents (Class 604/220)
  • Patent number: 5788672
    Abstract: A syringe assembly has a hub body which can be inserted into a hub insertion hole and pulled out thereof into inside a syringe body. A chamfer portion is formed at the hub body, being capable of engaging with the hub insertion hole. A needle insertion hole capable of being inserted a needle therein is provided with an end face of the hub body in a direction of an axis center of the hub body. A flow hole is provided with the hub body such that the needle insertion hole and an inside of the syringe body are communicated with each other in the direction of the axis center. A piston engagement hole is provided on end face side of the hub body, so as to engage with the piston. A seal taper is annularly formed at the hub body, such that its outside diameter is made narrower for the end face side, so as to abut on and contact with an inner face of the hub insertion hole.
    Type: Grant
    Filed: June 20, 1996
    Date of Patent: August 4, 1998
    Inventor: Yoshikuni Saito
  • Patent number: 5728073
    Abstract: A syringe comprising a tubular body (11) closed at one end (12) and open at the other end (13), a plunger (14) receivable in the body (11) to define a chamber (16) of variable volume, a needle support (24) adapted to support and accommodate a hollow needle, said needle support (24) being supported from or in the wall of the body (11) and being movable in a direction substantially parallel to the main axis of the body (11) between a first position at which the needles extends from the one end of the body (11) and the interior of the needle is in communication with the chamber (16), and a second position at which the outer end of the needle is in a retracted position, said needle support (24) having a protrusion (28) which is selectively engageable with the wall of the body (11) at the first and second positions to be able to be retained at said positions and receivable through the wall of the body (11) when at the second position to be engaged with the plunger (14) to prevent axial movement of both the needle
    Type: Grant
    Filed: March 26, 1997
    Date of Patent: March 17, 1998
    Assignee: Eastland Technology Australia Pty Ltd.
    Inventor: Maxwell Edmund Whisson
  • Patent number: 5700247
    Abstract: A backstop device to prevent inadvertent withdrawal of a stopper or plunger rod from the open distal end of a flangeless syringe barrel. The backstop includes a retaining wall configured to engage at least a portion of the syringe barrel, and a finger plate at the proximal end of the retaining wall. The finger plate includes an aperture adjacent the open proximal end of the syringe through which a stopper may be inserted. If desired, a ridge may be formed around the periphery of the aperture which may engage with a portion of the syringe barrel. The aperture and, if present, the ridge present a smaller passageway than the inside diameter of the syringe, preventing inadvertent removal of the stopper from the syringe. The backstop can be placed on the syringe regardless of the presence or absence of the plunger.
    Type: Grant
    Filed: December 18, 1996
    Date of Patent: December 23, 1997
    Assignee: Becton Dickinson France S.A.
    Inventors: Jean Pierre Grimard, Eric Olive
  • Patent number: 5667495
    Abstract: A backstop device to prevent inadvertent withdrawal of a stopper from the open distal end of a syringe barrel. The backstop, mounted to a syringe flange, includes a pair of spaced apart plates located on either side of the flange. Both plates include respective apertures accessible through lead openings formed through the plates. The bottom aperture is formed for snug contact with the syringe barrel, while the upper aperture includes a ridge engageable with the interior of the syringe barrel adjacent the open distal end. The top aperture and ridge together present a smaller passageway than the diameter of the stopper, preventing inadvertent removal thereof. The backstop can be placed on the syringe regardless of the presence or absence of the plunger.
    Type: Grant
    Filed: April 21, 1995
    Date of Patent: September 16, 1997
    Assignee: Becton Dickinson France S.A.
    Inventors: Ralf V. Bitdinger, Jean Pierre Grimard
  • Patent number: 5658258
    Abstract: The applicator is assembled from an integral injection-molded part which includes an elongated flat strap from which a piston member projects at a right angle to one side and, at some distance therefrom, a cylinder member including a canula molded thereon projects at a right angle to the other side. The strap forms two spring arms of which the one, being bent by 180.degree., is first slid over the piston head with a recess. Subsequently, the cylinder is also fit onto the piston head, with the strap section that connects the piston to the cylinder head being also bent by 180.degree.. The piston head snaps in a rear position into the cylinder. The two biased spring arms always bias the piston in the direction of the rear end position, so that the applicator can be operated with one hand to take, for instance, blood from a container.
    Type: Grant
    Filed: September 15, 1995
    Date of Patent: August 19, 1997
    Assignee: GAPLAST GmbH
    Inventors: Roland Kneer, Christoph Heiland
  • Patent number: 5651372
    Abstract: A control syringe is provided for fine needle aspiration of biopsy tissue. An aperture through the barrel of the syringe is located at a rearward position of the barrel. A low pressure created in the barrel by withdrawing the plunger is broken by withdrawing the plunger past the aperture. Thereafter, the plunger may be pushed forward of the aperture so that collected tissue may be discharged by moving the plunger forward. A detent attached to the plunger holds the plunger in its rearward position until released. The detent comprises a plastic member with an outwardly biased shoulder for engaging the rearward end of the barrel. Such a detent is released by pressing it towards the plunger.
    Type: Grant
    Filed: June 28, 1995
    Date of Patent: July 29, 1997
    Inventor: James C. Caillouette
  • Patent number: 5615772
    Abstract: A first object of the invention is to insure that medication filled syringe equipment can be kept sterile at all stages until use, is protected against malicious unauthorized use, can be packaged in a simpler way and can protect the medication to be in a stable form. A second object of the invention is to insure that an additional liquid such as an anesthetic, another medication in liquid form or a solubilizer can be aspirated by medication filled syringe equipment in an aseptic appropriate manner before injection. To attain these objects, the equipment of the invention comprises barrel 1, needle attaching portion 2 fitted with cap 11, plunger rod 22, and sealing device 31 as tube 32 of a heat-shrinkable film that is slipped over the area from the cap 11 through the barrel 1 to the basal head 23 of the plunger rod 22.
    Type: Grant
    Filed: September 29, 1995
    Date of Patent: April 1, 1997
    Assignee: Seikagaku Kogyo Kabushiki Kaisha (Seikagaku Corporation)
    Inventor: Masateru Naganuma
  • Patent number: 5607399
    Abstract: A backstop device to prevent inadvertent withdrawal of a stopper or plunger rod from the open distal end of a flangeless syringe barrel. The backstop includes a retaining wall configured to engage at least a portion of the syringe barrel, and a finger plate at the proximal end of the retaining wall. The finger plate includes an aperture adjacent the open proximal end of the syringe through which a stopper may be inserted. If desired, a ridge may be formed around the periphery of the aperture which may engage with a portion of the syringe barrel. The aperture and, if present, the ridge present a smaller passageway than the inside diameter of the syringe, preventing inadvertent removal of the stopper from the syringe. The backstop can be placed on the syringe regardless of the presence or absence of the plunger.
    Type: Grant
    Filed: September 22, 1995
    Date of Patent: March 4, 1997
    Assignee: Becton, Dickinson and Company
    Inventors: Jean P. Grimard, Eric Olive
  • Patent number: 5593387
    Abstract: A non-reusable syringe with automatically actionable protective needle cover. The syringe consists of a syringe which locks the plunger in place after full injection, rendering it unusable. In addition an automatic needle cover is provided which aids as a clamping device and prevents pricking or leaking of a needle. the means of operating the needle cover also allows the needle to be visible for injection.
    Type: Grant
    Filed: May 24, 1995
    Date of Patent: January 14, 1997
    Inventor: Roberta N. Rupp
  • Patent number: 5556384
    Abstract: The present invention is a self-destructive syringe that includes a cylindrical body with a hypodermic needle at one end, a breakable circle, and a retaining ring. The syringe has a piston with a sharp point at the front of the piston. When the piston reaches the lower end of the stroke, the sharp point on the piston perforates the breakable circle while the edges of the piston are encased in the retaining ring. The retaining ring has cutting edges which will damage the seal of the piston if the piston is returned for reuse. A seal, supported by flanges, is positioned at an opposite end of the syringe so as to prevent the piston from reaching the destructive end of the syringe.
    Type: Grant
    Filed: April 17, 1995
    Date of Patent: September 17, 1996
    Inventor: Fernando A. F. da Encarnac ao
  • Patent number: 5531708
    Abstract: A syringe for administering medicines, pharmaceuticals, and other liquid or semi-liquid materials includes a movable scale which is automatically reset to a zero position after a preselected dosage of material has been discharged from the syringe. The scale is adjustable for selecting subsequent dosages to be discharged, which may be the same or different in quantity from the previously discharged dosage. The automatic zero reset feature of the scale enables a user to administer multiple dosages of material from the same syringe, and vary the quantity of each dosage if desired, without the need to make calculations or adjust the scale to compensate for either the quantity of material previously discharged from the syringe or the quantity of material currently remaining in the syringe.
    Type: Grant
    Filed: July 1, 1994
    Date of Patent: July 2, 1996
    Assignee: American Cyanamid Company
    Inventor: Keith F. Woodruff
  • Patent number: 5496278
    Abstract: A safety syringe includes a means for retracting a used needle within the syringe, sealing the syringe and locking the plunger in a retracted position requiring only conventional syringe manipulation. Accidental contact with a used needle or syringe contents is thereby prevented such that the syringe can be safely discarded in a conventional manner. A needle clamp augmentation to the front surface of the syringe plunger is engageable with the needle head portion of a hollow needle releasingly mounted to the syringe. A sealant cavity formed proximate to the needle end of the syringe contains a sealing compound. A sealant cavity cover prevents migration of the sealing compound into the syringe cylinder. Fully depressing the plunger causes the needle clamp to engage the needle head portion. Retracting the plunger dislodges and retracts the needle, drawing a sealing means about the gap left by the retracted needle and preventing fluid leakage.
    Type: Grant
    Filed: July 25, 1994
    Date of Patent: March 5, 1996
    Inventor: Danny Buff
  • Patent number: 5489272
    Abstract: A tubular barrel having an inner surface with threads at a front end ther receives a chuck having corresponding threads for engaging the chuck to the barrel, the chuck having additional threads in an opposite sense for engaging a needle hub thereto. A piston received slidably in the barrel engages the rear of the chuck and is fixed against rotation relative to the hub, whereby a piston stem protruding from the rear of the barrel can be used to engage the chuck to the front end of said barrel. Cams provided on the inside surface cooperate with flexible cam followers on the chuck to make disengagement of the chuck from the barrel more difficult than engagement. A circumferential rib provided on the inside surface at the rear of the barrel impedes withdrawal of the piston, the stem being frangible to prevent the reuse.
    Type: Grant
    Filed: October 18, 1994
    Date of Patent: February 6, 1996
    Assignee: Medi Plus Tec Medizinisch-Technische Handelgesellschaft mbH
    Inventor: Matthias Wirtz
  • Patent number: 5485853
    Abstract: One end of a hollow cylindrical tube is attached to a tubing positionable in a patient's body. A radial flange on the tube supports a collar in abutting relationship to one flange surface. Lugs extend integrally from the collar through the flange for disposition against the opposite flange surface. The collar extends radially past the tube's inner periphery and has slots at its inner periphery. Stops integral with the inner periphery of the collar are annularly displaced relative to the slots. Ramps on the collar lead to the stops. A piston in the tube along part of its length has, at the end within the tube, a sleeve in sealed relationship with the tube is inner periphery. Splines have grooves at spaced positions along their axial lengths at the radially outer ends of the splines. A handle at the piston axial end has an aperture to receive a user's finger for manual adjustment of the piston axially relative to the tube.
    Type: Grant
    Filed: April 28, 1994
    Date of Patent: January 23, 1996
    Inventor: George Stubbs
  • Patent number: 5484413
    Abstract: A non-reusable, disposable syringe has a cylindrical barrel with a needle assembly on its forward end, and a needle trap for protecting the needle from contact. The needle trap includes a hollow plastic housing with a rearward end portion adapted to fit over the cylindrical barrel, and a generally cone-shaped forward end portion having a closed forward extremity. A locking member of generally hollow cylindrical shape is secured within the rearward end of the needle trap housing and has forwardly directed flexible, circumferentially spaced, inwardly tapering fingers that taper inwardly more rapidly than the forward end of the housing when the needle trap is placed over the barrel the fingers of the locking member flex outwardly to pass over the needle base and then flex inwardly to assume a locking position behind the needle base.
    Type: Grant
    Filed: November 23, 1994
    Date of Patent: January 16, 1996
    Assignees: Alexis M. Gevorgian, Artin V. Gevorgian
    Inventor: Abraham Gevorgian
  • Patent number: 5478314
    Abstract: A syringe tubular body forms a fluid receiving chamber having a restricted opening at one end for receiving a hollow needle and a wider opening at the other end for receiving a tubular plunger. The plunger has resilient fingers at its distal end which is inserted into the body chamber and an annular groove in one embodiment adjacent the proximal end. The fingers have inwardly extending hook-like projections. A piston assembly includes a body with an annular groove which releasably receives the projections for securing the piston assembly to the plunger during injection, the piston assembly including an elastomeric disc piston sealingly engaged with the tubular body chamber sides. A sleeve is external and movable along the body and is next adjacent the disc. The sleeve has an annular groove which is selectively engaged by the projections. The sleeve has an axial extent greater than that of the piston assembly body groove.
    Type: Grant
    Filed: December 27, 1994
    Date of Patent: December 26, 1995
    Inventor: Robert Malenchek
  • Patent number: 5411489
    Abstract: Disclosed are pre-filled syringes equipped with an improved plunger, a plunger actuating cylinder and a plunger rod, characterized by a leak-proof seal and easy sliding property.
    Type: Grant
    Filed: May 6, 1994
    Date of Patent: May 2, 1995
    Assignee: Sterling Winthrop Inc.
    Inventors: Shrikant N. Pagay, Robert J. Bachorik, II, Richard T. Liebert
  • Patent number: 5399170
    Abstract: A syringe (1) comprising a barrel (2) having an outer sheath (3) and an inner sheath (4). The outer sheath (3) has a nozzle (5) and the inner sheath also has a nozzle (6) which corresponds with and fits into, the nozzle (5). A needle (7) is attachable to the nozzle (6). A plunger (9) is located partly within the barrel (2) and is used to administer a drug. After the drug is administered the plunger (9) interlocks with the inner sheath (4) and as the plunger (9) is withdrawn, so too is the inner sheath (4), Hence the needle (7) is retracted to be within the outer sheath (3). After the needle (7) is retracted, the outer sheath (3) and inner sheath (4) are interlocked thus preventing the syringe (1) from being used again as well as locking the needle (7) in a safe retracted position within the outer sheath (3 ) thereby preventing "needle stick".
    Type: Grant
    Filed: August 30, 1993
    Date of Patent: March 21, 1995
    Assignee: Western Medical Products Pty Limited
    Inventor: Kevin Whitley
  • Patent number: 5358497
    Abstract: A medical locking device securely fits onto finger grips of a syringe. The locking device is axially aligned with the syringe along a defined longitudinal axis wherein the syringe receives a plunger. The locking device includes a centrally positioned aperture which receives the shaft of the plunger. A retaining member is positioned around the aperture and receives the finger grips of the syringe by engaging at least three sides of the finger grips. This eliminates shifting of the medical locking device and there are opposed cutting members which are chordally positioned in the aperture. The cutting members taper as fine cutting edges for wedging into the plunger during execution of a locking position. To utilize the device, the user twists the plunger into a locking position so that the cutting members wedge into the plunger. This locking position eliminates and prevents any further plunger movement in either direction along the longitudinal axis.
    Type: Grant
    Filed: January 11, 1994
    Date of Patent: October 25, 1994
    Assignee: Bioteque America, Inc.
    Inventors: Denis P. Dorsey, Shih-Mei Wu
  • Patent number: 5350365
    Abstract: A surgical instrument for injecting/removing non-solid substances is diclosed. The instrument comprises a body formed from two legs (1, 2) pivotally articulated to each other at one of their ends, one of said legs (1) being provided with means (15,17) for receiving and retaining a syringe or squirt (16) while the other of said legs (2) is provided with means (20,22) for selectively retaining a plunger (19) which cooperates with said syringe or squirt, said legs being selectively pivotable between a first position wherein said plunger (19) is received within said syringe (16) and a plurality of positions wherein plunger (18) moves within syringe (16) in order to inject/remove a non-solid substance.
    Type: Grant
    Filed: August 2, 1993
    Date of Patent: September 27, 1994
    Inventor: Roberto De Godoy Moreira
  • Patent number: 5328486
    Abstract: A syringe for administering medicines, pharmaceuticals, and other liquid or semi-liquid materials includes a movable scale which is automatically reset to a zero position after a preselected dosage of material has been discharged from the syringe. The scale is adjustable for selecting subsequent dosages to be discharged, which may be the same or different in quantity from the previously discharged dosage. The automatic zero reset feature of the scale enables a user to administer multiple dosages of material from the same syringe, and vary the quantity of each dosage if desired, without the need to make calculations or adjust the scale to compensate for either the quantity of material previously discharged from the syringe or the quantity of material currently remaining in the syringe.
    Type: Grant
    Filed: November 19, 1991
    Date of Patent: July 12, 1994
    Assignee: American Cyanamid Company
    Inventor: Keith F. Woodruff
  • Patent number: 5312348
    Abstract: A single-usage disposable hypodermic syringe in which the needle cover of the conventional syringe is replaced by a tubular housing which encloses from the tip of the needle cannula to the rear end of the barrel. An empty space is reserved inside the needle locking base for the positioning of a plug. When an arc segment of a projected member located at the front of the plunger is moved forward with the plunger, the plug with the channel is being pushed to the bottom of the empty space, allowing the plug to rotate and block off the opening of the needle cannula. The medication can no longer be given. A triangular plate installed in the rear portion of the Y-shaped plunger is used to restrict the movement of the projecting plate. Only when the projecting plate is rotated and swing away that the syringe is able to accept medication. The syringe cannot be reused and the tubular housing is used to cover the overall syringe for disposal.
    Type: Grant
    Filed: July 30, 1993
    Date of Patent: May 17, 1994
    Inventor: Ten S. Sans
  • Patent number: 5290228
    Abstract: The present invention is a two-compartment syringe which may contain a medical substance, such as a freeze-dried powder, and a solvent separately. When used, the medical substance and solvent are mixed for injection. A silicone coating is used inside the syringe barrel. The syringe is further provided with finger hooks to enable use of the syringe with one hand.
    Type: Grant
    Filed: July 16, 1992
    Date of Patent: March 1, 1994
    Assignee: Santen Seiyaku Kabushiki Kaisha
    Inventors: Osamu Uemura, Yukio Kusu
  • Patent number: 5263934
    Abstract: A syringe having a casing, a shiftable rod assembly, and a needle foot latched at a first end of the casing is disclosed. The syringe is equipped with a shiftable ring for limiting stroke length of the rod assembly in such a way to maintain the piston at a predetermined distance from the needle foot, and to increase the stroke length after a second outward shifting stroke of the piston for drawing in liquid, in such a way that upon a second inward shifting stroke of the piston for expulsion of the injection liquid, the piston will be coupled with the needle foot.
    Type: Grant
    Filed: January 25, 1993
    Date of Patent: November 23, 1993
    Inventor: Abraham van den Haak
  • Patent number: 5259840
    Abstract: A locking syringe is disclosed which comprises a plunger, a cylinder, and a cap. The plunger includes a proximal end and a distal end having a first set of annular ridges formed thereon. The cylinder comprises an open cylindrical passage and includes a needle attached in a conventional manner at the proximal end thereof. A plurality of annular ridges are formed inside the passageway at the distal end of the cylinder. The ridges in the cylinder engage the annular ridges on the plunger in a snap fit and prevent removal of the plunger from the cylinder after the syringe has been used. The cylinder also includes a plurality of annular ridges formed adjacent the needle. The ridges on the cylinder snap fit into mating annular ridges in the cap to prevent re-use of the needle once the syringe is discarded.
    Type: Grant
    Filed: September 3, 1991
    Date of Patent: November 9, 1993
    Inventor: Craig R. Boris
  • Patent number: 5246011
    Abstract: A control syringe is provided for fine needle aspiration of biopsy tissue. An aperture through the barrel of the syringe is temporarily covered with a flexible impervious pressure sensitive adhesive tape. A low pressure created in the barrel by withdrawing the plunger is broken by peeling the tape from the barrel. Thereafter, the tape may be replaced over the aperture so that collected tissue may be discharged by moving the plunger forward. A ratchet and pawl arrangement on the syringe holds the plunger in its rearward position until released. One ratchet and pawl comprises a plurality of ratchet teeth along at least one rib of an X-shaped cross section of the plunger and a pawl on the rearward end of the barrel for engaging the ratchet teeth. Such a ratchet is released by rotating the plunger.
    Type: Grant
    Filed: January 30, 1992
    Date of Patent: September 21, 1993
    Inventor: James C. Caillouette
  • Patent number: 5242400
    Abstract: A pre-filled hypodermic syringe includes a retractable needle and detachable plunger shaft so the syringe can be selectively rendered inoperable. A liquid held within the syringe is held in place by a elastomeric stop that surrounds the discharging tip of the needle. When the syringe is to be used, the needle stop is removed and the plunger is advanced within the syringe barrel until the liquid is displaced through the needle. When the plunger contacts the base of the needle within the syringe barrel, the plunger becomes capable of being rotated. The rotation of the plunger connects the plunger to the needle and the needle can be retracted into the syringe barrel with the plunger. Once fully retracted, the needle cants and the plunger shaft can be destructively disconnected from the plunger, rendering the syringe inoperable.
    Type: Grant
    Filed: December 6, 1991
    Date of Patent: September 7, 1993
    Assignee: The Medtech Group, Inc.
    Inventors: Joseph W. Blake, III, Thomas E. Sloane, Jr., Laurence Wesser
  • Patent number: 5236420
    Abstract: A resilient material pressurizing plunger for syringes or like containers in which the plunger construction is such that on the initial insertion into the syringe by a first inserting member, the plunger is distortable thus allowing the gas pressure generated by the plunger insertion to escape. The plunger is also capable of pressurizing the chamber when further insertion occurs by use of a second insertion member which prevents the distortion.
    Type: Grant
    Filed: June 1, 1992
    Date of Patent: August 17, 1993
    Inventor: Frederick W. Pfleger
  • Patent number: 5215536
    Abstract: A syringe for injecting medicinal fluids into a patient or aspirating fluids or tissue from a patient, wherein the syringe incorporates a self-locking mechanism on the plunger thus preventing the plunger from being withdrawn back into the barrel by the action of a vacuum in the syringe barrel. The self-locking mechanism is independent of the relative rotational relationship of the plunger with respect to the barrel. Unlocking may be effected by simply squeezing the self-locking mechanism on the plunger, no rotational force being necessary.
    Type: Grant
    Filed: November 13, 1991
    Date of Patent: June 1, 1993
    Assignee: Merit Medical Systems, Inc.
    Inventors: Fred P. Lampropoulos, William Padilla, Arlin D. Nelson
  • Patent number: 5205825
    Abstract: A locking device is capable of being retrofitted by insertion into a standard plastic syringe. The syringe is of the type having a cylindrical inner wall made of plastic material, a closed, distal end, and an open, proximal end for movement of a plunger therein. The plunger has a plunger stem made of plastic material with longitudinal ribs in an "X" shaped cross-section. The locking device has a clip-type body portion formed with a U-shaped channel for clipping onto one longitudinal rib, a first set of barbed points angled toward the plunger stem for engaging the plunger stem when it is depressed toward the distal end after a first retraction movement toward the proximal end of the syringe, and a second set of barbed points angled toward the inner wall of the syringe for engaging the inner wall in order to lock the plunger stem from a second retraction movement, thereby preventing reuse of the syringe.
    Type: Grant
    Filed: July 19, 1991
    Date of Patent: April 27, 1993
    Inventors: Alan C. Allison, Richard A. Jaffe
  • Patent number: 5188616
    Abstract: A single-syringe device capable of inserting its contents, such as a blood filter, into the body of a patient in either of two opposite directions exclusively chosen by an operator in a fail-safe manner. First and second plungers slide in opposite directions within the syringe, which is connected to a catheter or similar, to transfer the contents into the patient's body. The device is constructed so that only one plunger can be employed at a time. Each plunger and the end of the syringe it cooperates with is coded, by color or otherwise. Such a construction and coding insure fail-safe operation when the syringe's contents must be inserted in only one direction. For example, a blood filter that traps emboli must have the same orientation whether it be inserted in one direction from the patient's jugular vein or in the opposite direction from the patient's femoral vein.
    Type: Grant
    Filed: October 16, 1991
    Date of Patent: February 23, 1993
    Assignee: Celsa L.G. (Societe Anomyne)
    Inventor: Guy Nadal
  • Patent number: 5181909
    Abstract: A medical syringe has a plunger bore (1 and 2) that is flexible. A hermetically-sealed glass ampule (3) containing a drug in the form of a liquid referred to generally as a sterile preparation (4) is placed in the plunger bore (1 and 2). When the plunger (1) is pulled outwardly a select distance to expose the flexible plunger bore (2), the glass ampule (3) is broken by hand-squeezing the plunger bore (2) against it. Liquid preparation (4) from the glass ampule (3) is directed through a check-valved orifice (16) at a tip of a resilient piston section (21) of the plunger (1). At the check-valved orifice (16), the preparation (4) enters into a syringe bore (6). There the preparation (4) can be injected through a conventional luer (38-40) and hypodermic needle (37) by the standard practice of depressing the plunger (1) into the syringe (7). Variations are provided for storing ampules of preparation either in or separately from the syringe. Embodiments are described for various adaptations.
    Type: Grant
    Filed: May 15, 1991
    Date of Patent: January 26, 1993
    Inventor: Richard H. McFarlane
  • Patent number: 5174301
    Abstract: A blood extraction device features an extraction cylinder (11) having a forward end for attaching a needle (12) and a rear end having an opening (13) for a piston rod (14) together with a piston (15) secured to the forward end of the piston rod (14) arranged to slide axially in the extraction cylinder (11). The piston (15) can essentially be moved only in the direction away from the foward end of the extraction cylinder (11) and practically incapable of being moved when subjected to a force in the direction of the forward end due to one-way coacting means of prevention (17 , 18).
    Type: Grant
    Filed: January 30, 1992
    Date of Patent: December 29, 1992
    Assignee: Walter Sarstedt Geraete und Verbrauchsmaterial fuer Medizin & Wissenschaft
    Inventor: Walter Sarstedt
  • Patent number: 5171300
    Abstract: A syringe and needle assembly having a piston that is formed to engage and retract the needle assembly into the syringe barrel. The piston includes a spring member that is elastically deformed by the attachment of the piston to the needle assembly. The spring member causes the needle assembly to be spring biased into a canted position so that, once retracted into the syringe barrel, the needle assembly cants to an inoperable position.
    Type: Grant
    Filed: April 16, 1992
    Date of Patent: December 15, 1992
    Assignee: Medtech Group, Inc.
    Inventors: Joseph W. Blake, III, Thomas E. Sloane, Jr.
  • Patent number: 5135495
    Abstract: A self-discarding syringe has a tube having a spout at an end thereof, and a piston including two elements movable relative to each other. One of the two elements is rigid and another of the two elements is resilient. The tube has a limitation for limiting displacement of the piston means away from the spout.
    Type: Grant
    Filed: March 22, 1990
    Date of Patent: August 4, 1992
    Inventor: Carlos E. Arcusin
  • Patent number: 5135511
    Abstract: An adapter is provided for enabling the single-handed use of a syringe for aspiration. An assembly including such an adapter is also provided. The adapter includes an elongate body portion including a first end portion which functions as a thumb pad and a second end portion secured to the syringe barrel. A winged member is secured to the syringe plunger and includes a pair of flanges extending outside the adapter. The syringe plunger may be retracted using only one hand by pulling the flanges of the winged member with the index and middle fingers while maintaining the thumb upon the first end portion of the adapter.
    Type: Grant
    Filed: August 22, 1990
    Date of Patent: August 4, 1992
    Assignee: Becton, Dickinson and Company
    Inventors: Frederick C. Houghton, Richard G. Giddes
  • Patent number: 5120314
    Abstract: A single use hypodermic syringe uses a generally cylindrical elongated syringe body defining a center bore and supporting a hollow needle in communication with the center bore through the inlet/output channel. A movable piston formed of an elastic material is sealingly supported within the syringe bore. A piston driver member extends into the syringe bore and is coupled to the piston. An annulus ring is fixed within the center bore near the inlet/outlet channel. The annulus permits the piston to pass over it when delivering an injection but locks onto the piston at the completion of the injection, precluding any further use of the syringe.
    Type: Grant
    Filed: March 22, 1991
    Date of Patent: June 9, 1992
    Inventor: Eugene C. Greenwood
  • Patent number: 5114405
    Abstract: A single use tamper resistant syringe having a locking member which prevents retraction of the plunger after the latter has been fully depressed and discharging the contents of the syringe. The proximal end of the plunger is provided with an abutment and the inside of the barrel is provided with dogs which are biased inwardly. When the plunger is depressed and the abutment slides by the dogs the latter extend into the barrel to block retraction of the plunger. Tampering of the locking arrangement prior to use of the syringe is prevented by providing a detachable piston cap at the distal end of the plunger so that when the plunger is removed prior to use the cap is dislodged by said dogs and remains within the barrel of the syringe thereby rendering inoperative the syringe.
    Type: Grant
    Filed: May 21, 1990
    Date of Patent: May 19, 1992
    Inventor: Douglas A. Winter
  • Patent number: 5112307
    Abstract: A reusable dental syringe including a conventional medication filled carpule and a conventional double-ended needle cannula which is to be retracted into a compact enclosure to permit the safe handling and disposal of the cannula while avoiding an accidental needle stick and the possible spread of disease. The carpule is inserted into a hollow carpule adapter to engage a movable needle carrier at the distal end of the adapter. The combination carpule and adapter are loaded into the cylinder of the syringe, and the needle cannula is attached to the needle carrier to penetrate the carpule. At the conclusion of an injection, the combination carpule and carpule adapter are rotated outwardly from the syringe cylinder, and the carpule is then pulled rearwardly through the adapter, whereby to correspondingly relocate and anchor the movable needle carrier at the proximal end of the adapter.
    Type: Grant
    Filed: April 24, 1990
    Date of Patent: May 12, 1992
    Assignee: Habley Medical Technology Corp.
    Inventors: Terry M. Haber, Clark B. Foster
  • Patent number: 5106372
    Abstract: A single use syringe assembly is provided and includes an elongate and generally cylindrical syringe barrel having a preferably annularly shaped ring member near the substantially closed distal end thereof. A plunger assembly is provided and includes an elongate plunger rod having a plunger tip and a locking disc on the distal end thereof and a compressible piston member mounted on the plunger tip of the plunger rod. The piston member includes a proximal recess therein to receive the plunger tip of the plunger rod therein. When the plunger assembly is moved distally and proximally in the syringe barrel during normal use, the piston member may be moved between the distal and proximal ends of the syringe barrel without disabling the syringe assembly. When the user desires to disable the syringe assembly, the plunger assembly is initially moved distally in the syringe barrel until the piston member contacts the distal end of the syringe barrel to expel the contents of the syringe assembly.
    Type: Grant
    Filed: May 3, 1991
    Date of Patent: April 21, 1992
    Assignee: Sherwood Medical Company
    Inventor: Alan B. Ranford
  • Patent number: 5098382
    Abstract: A resuable safety module-activator reshielding tool having a barrel within which to receive a single use, disposable, needle/medication cartridge from which a pre-filled supply of fluid medication is injected. The cartridge includes a needle cannula that is advanced outwardly of the barrel to administer an injection and retracted inwardly of the barrel at the conclusion of the injection. The cannula is crushed, shielded and discarded all within the cartridge so as to permit a safe handling thereof after use and avoid an accidental needle stick. The activator tool cannot be reused until the injection has been completed, the cannula destroyed and shielded, and the cartridge removed from the barrel for disposal.
    Type: Grant
    Filed: December 11, 1989
    Date of Patent: March 24, 1992
    Assignee: Habley Medical Technology Corporation
    Inventors: Terry M. Haber, Clark B. Foster, William H. Smedley, John A. Lewis, Jr.
  • Patent number: 5095914
    Abstract: A blood extraction device features an extraction cylinder (11) having a forward end for attaching a needle (12) and a rear end having an opening (13) for a piston rod (14) together with a piston (15) secured to the forward end of the piston rod (14) arranged to slide axially in the extraction cylinder (11). The piston (15) can essentially be moved only in the direction away from the forward end of the extraction cylinder (11) and practically incapable of being moved when subjected to a force in the direction of the forward end due to one-way coacting means of prevention (17, 18).
    Type: Grant
    Filed: September 25, 1990
    Date of Patent: March 17, 1992
    Assignee: Walter Sarstedt Geraete und Verbrauchsmaterial fuer Medizin & Wissenschaft
    Inventor: Walter Sarstedt
  • Patent number: 5090962
    Abstract: A single use syringe in the form of a cylindrical barrel with a first end attached to a hypodermic needle. A plunger and piston in the barrel draw liquid into the syringe through the hypodermic needle and eject the liquid through the hypodermic needle. The plunger includes a detent formed at an intermediate location. An insert at the second end of the barrel includes at least one cantilevered, longitudinally extending resilient arm with a follower at a free end thereof that rides over the plunger. When the plunger is pushed to a final position, the follower drops into the plunger detent to block any further longitudinal motion of the plunger and piston preventing any subsequent use.
    Type: Grant
    Filed: April 28, 1989
    Date of Patent: February 25, 1992
    Assignee: FLP Enterprises, Inc.
    Inventors: Maurice J. Landry, Jr., Frederick L. Plouff
  • Patent number: 5085642
    Abstract: An autoinjector particularly suited to be carried on the person of a user comprising a housing defining an exterior configuration of a size and shape approximately the same as that of a conventional fountain pen including a housing body assembly of elongated generally cylindrical configuration and a separate housing cap structure of elongated generally cylindrical configuration having an elongated clip thereon. The housing cap structure is detachably secured to the housing body assembly in open ended telescopic relation with an opposite end portion thereof preferably by a childproof connection. A medicament cartridge assembly is mounted in a storage position within a forward end of an interior chamber within the housing body assembly and a releasable stressed spring assembly is carried by the housing body assembly adjacent the rearward end thereof.
    Type: Grant
    Filed: July 17, 1989
    Date of Patent: February 4, 1992
    Assignee: Survival Technology, Inc.
    Inventors: Stanley J. Sarnoff, Claudio Lopez
  • Patent number: 5085641
    Abstract: A stressed spring assembly for providing an operative stroke in cooperating relation with a medicament cartridge assembly of an auto-injector so as to inject a liquid medicament of the medicament cartridge assembly through a hypodermic needle of the medicament cartridge assembly into an injection site of the user. The stressed spring assembly includes a cap structure serving the plural purposes of (1) facilitating the securement of the cap structure and remainder of the auto-injection with the user's pocket, (2) alleviating the likelihood of an unwanted release of the releasable mechanism of the stressed spring assembly with a resultant unwanted movement of the hypodermic needle and an unwanted movement of the liquid medicament outwardly of the hypodermic needle by requiring two different manual movements for its removal, and (3) protecting against an unwanted contact with the hypodermic needle while in extended operative position after withdrawal from the injection site.
    Type: Grant
    Filed: April 12, 1990
    Date of Patent: February 4, 1992
    Assignee: Survival Technology, Inc.
    Inventors: Stanley J. Sarnoff, Claudio Lopez, N. Lawrence Dalling
  • Patent number: 5067948
    Abstract: A vial holding syringe (84) includes a barrel (6) having a bore (12), a sealable needle end (8) and an open plunger end (10). A plunger (16) is mounted within the bore and includes an elongated hollow stem (18), having an interior (36) sized to hold a conventional vial (4), and a piston (20). The stem includes a hollow piercing member (46) having a piercing end (48), opposite the membrane (42) covering the vial ,and an outer end (50), adjacent a one-way valve (70) to permit passage of the medication (80) within the vial from the vial, through the hollow piercing member and through the one-way valve into a variable volume region (67) of the bore between the needle end of the barrel and the piston. An opening (14) at the needle end of the barrel is initially sealed by a cap (66). To use, the plunger is pulled part way from the bore to create a partial vacuum within the variable volume region. During this process, the diaphragm of the vial is driven onto the piercing end of the piercing member.
    Type: Grant
    Filed: September 27, 1990
    Date of Patent: November 26, 1991
    Assignee: Habley Medical Technology Corporation
    Inventors: Terry M. Haber, Clark B. Foster
  • Patent number: 5059181
    Abstract: A non-rechargeable, disposable hypodermic syringe for use with a needle includes a barrel, a retaining ring, and a plunger. The plunger has at least one annular notch formed therein. The barrel has at least one internal inwardly-flared tab formed therein which is oriented towards the forward end of the barrel. The tab is inwardly-biased, so that during rearward movement of the plunger, after delivery of the substance therein, the tab is received in the notch for annularly engaging in the notch, preventing the plunger's continued rearward movement and preventing the recharging of the syringe. In this manner, the syringe cannot be reused. The retaining ring is circumferentially disposed in the barrel between the plunger and the barrel. Cooperating ratchet teeth between the plunger and the ring coordinate the forward movement of the plunger with the ring, permitting the initial filling and aspiration of the syringe.
    Type: Grant
    Filed: February 2, 1990
    Date of Patent: October 22, 1991
    Inventor: Robert B. Agran
  • Patent number: 5049135
    Abstract: An improved medical lavage apparatus (10) includes guide/lock/stop tabs (122) which are inserted through a medical lavage syringe housing (20) into irrigation and aspiration bores (30, 34) thereof for engaging longitudinal ribs (68a-d, 69a-d) of irrigation and aspiration plungers (24, 26) to prevent their rotation and a circumferential latch rib 134a of the aspiration plunger for locking the aspiration plunger in an inserted position. The tabs also contact end circumferential ribs 70' of the plungers for providing stops to prevent the plungers from being removed from their respective bores. The tabs comprise two legs (126) which straddle the longitudinal ribs, with a longitudinal rib 68a of the aspiration plunger having a notch (140) at the tab in the aspiration bore to allow rotation of the aspiration plunger when it is in the inserted position for engaging the legs with the circumferential latch rib.
    Type: Grant
    Filed: September 18, 1990
    Date of Patent: September 17, 1991
    Assignee: Code Blue Medical Corporation
    Inventor: Richard C. Davis
  • Patent number: 5045063
    Abstract: A non-reusable hypodermic syringe is disclosed having a body having a barrel for receiving fluid to be injected including an aperture in the body at the forward end of the syringe, a plunger carrying a piston having a collar thereon and of larger size than the aperture, the collar deformable in a first direction for passage through the aperture and resisting deformation in a second direction for blocking passage through the aperture.
    Type: Grant
    Filed: May 30, 1989
    Date of Patent: September 3, 1991
    Inventor: Alissa R. Spielberg
  • Patent number: 5037382
    Abstract: The present invention relates to a disposable syringe the barrel (4) of which is provided with a blob (6) of a cured adhesive substance on the barrel that prevents the piston (5) from being pulled out of the open rear end (8) of the barrel (4), for example when operated by an unexperienced person.
    Type: Grant
    Filed: January 24, 1989
    Date of Patent: August 6, 1991
    Assignee: Novo Industri A/S
    Inventors: Ingelise Kvorning, Anne Sorensen, Flemming Manique