Abstract: A hub to be attachably and detachably inserted into a hub insertion hole of a syringe body having a hub insertion hole cylindrically formed at a top thereof has a cylindrical hub body through which the hub can be inserted into the hub insertion hole and can be pulled out of the hub insertion hole in a syringe body. At an outer peripheral portion of the hub body, a hub stop groove in the shape of a groove is annularly formed capable of engaging with the hub stop rib. At an end face of the hub body, a needle insertion hole capable of inserting a needle therein is provided. A flow hole is provided with the hub body such that the needle insertion hole communicates with the inside of the syringe body. At an end face of the hub body, a piston engagement hole is provided so as to engage with the piston.

Abstract: A non-reusable retractable safety syringe is provided which has a hollow plunger and a seal member carried thereon. The provision of the plunger and the seal relative to the barrel permits the plunger, with sufficient strength, to carry applied pressure through the device during injection of a medicinal or other fluid into a patient, and yet permit the seal disposed at one end of the plunger to have maximum sealing integrity between the plunger and a cylindrical barrel disposed around the exterior of the plunger, to abate leakage of the liquid in a chamber within the barrel, as the plunger is manipulated from an expanded position to an expended position and thereafter to a third, or collapsed position. Designs for securing the seal relative to the plunger are disclosed. The syringe may be used to insert and/or withdraw fluid relative to the patient.

Abstract: A blood collection device for use with vacuum sample tube is provided having a retractable carrier for a double cannula. A compress spring is mounted between the carrier and the proximal end of the barrel to bias the carrier backward into the barrel. A releasable retaining means is provided to retain the carrier in the proximal end with one end of the double cannula exposed for use. When the retaining means is released the carrier is automatically retracted into the barrel. A cap is provided to cover the original open end and a resealable puncture pad covers the proximal end after the carrier has been retracted.

Abstract: A safety syringe including a hollow barrel member having a substantially cylindrical shaped plunger receiving cavity formed therethrough, the plunger receiving cavity terminating in a plunger receiving opening at a first end thereof and a cavity bottom member having a needle mounting portion at a second end thereof, the needle mounting portion being centrally oriented on the cavity bottom member and secured thereto by a breakaway plastic bridge seal, the needle mounting portion having a fluid port member having a cavity facing opening including at least one plunger engagement member extending from a defining sidewall thereof; and a plunger member having a plunger shaft a plunger bulb in connection with an end thereof that has a needle portion engagement member adapted to engage the plunger engagement member when the needle portion engagement member is inserted into the cavity facing opening.

Abstract: A retractable needle syringe that includes a barrel assembly, a plunger assembly, and a needle assembly. The plunger assembly is movably mounted in the barrel assembly. And, the needle assembly is movably mounted in the barrel assembly and engagable with the plunger assembly, so that after the retractable needle syringe has been used, the plunger assembly is engaged with the needle assembly, the plunger assembly is pulled, and the needle assembly is drawn into the barrel assembly.

Abstract: A protractable and retractable hypodermic needle syringe device having a syringe barrel, a cylindrical plunger with a cam sleeve, a cam drive shaft, a needle carrier with a cam follower tab, and a hypodermic needle. The hypodermic needle can be moved by the cam system from a retracted position within the plunger to a protracted, operable position. The needle can be detached in the operable position, and reattached after use, onto the needle carrier. The plunger has a resealable membrane which is traversed by the needle and can be selectively prevented from longitudinal movement within the syringe barrel.

Abstract: An injection device comprising a hollow body (11) having a forward end (12) and a rearward end (13), the forward end (12) slidably receiving a hollow needle (15), the body (11) providing a chamber (A) between its forward end (12) and its rearward end (13), the chamber being defined between a plug (17) and a stop (18), the plug (17) being sealingly and slidably received within the body (11) adjacent the forward end (12), the stop (18) being slidably and sealingly received within the body (11) rearward of the plug (17) wherein a greater degree of effort must be applied to the stop (18) than to the plug (17) to effect slidable movement within the body, the rearward end (13) of the body having a portion (14) in which the stop (18) is not sealingly received within the body, a drive element (19) connected at one end to the plug (17) and slidingly and sealingly received through the stop (18) to extend from the rearward end (13) of the body (11), a manipulation member (20) provided on the other end of the drive eleme

Abstract: The present invention relates to a safety vacuum syringe with two opposite needles for blood sampling, which mainly comprises a cylindrical barrel, a bell type sleeve, a needle unit, a cylindrical vacuum container, a snapping member, a needle cap, and a bottom cap. When it is desired to sample blood, the vacuum container is pushed into the barrel through the back end thereof, so that the snapping member will be hooked with the bell type sleeve, After finished of the blood sampling, the vacuum container stored with blood is pulled out of the barrel, and the bell type sleeve with the needle unit will be pulled into the barrel, the needle cap and the bottom cap are then recversely inserted into the barrel for bending the needles to be damaged.

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

Abstract: A retractable needle system for use with a medical device is described. The system uses a retractor which engages the well of a needle support means and retracts the needle support means containing the needle back into the cylindrical barrel of the medical device.

Abstract: A catheter assembly is disclosed which includes a flexible catheter, a hub attached to the catheter which defines a lumen and an adjoining flash back chamber which communicate with the catheter, and a flexible resilient diaphragm attached to the hub through which a hypodermic needle such as a catheter introducer needle can be passed. The diaphragm prevents a liquid, such as blood, which has been introduced into the hub lumen from flowing past the diaphragm and beyond the hub when the diaphragm is unpenetrated. A hollow tubular body may also be included to which a cannulated catheter needle can be either stationarily or movably attached. The body is removably attached to the hub behind the diaphragm. If movably attached to the body, the needle has a retracted position fully recessed within the body for safe storage and an advanced operative position extending through the diaphragm, hub and catheter.

Abstract: An improved syringe of the type having a hollow body which is closed at one end by an injection means and is open at the other end, the open end receives an elongated plunger means which moves through the hollow body and forces the contents of the body through the injection means. The improvement is comprised of an elastic member which retracts the injection means into a protective covering.

Abstract: The syringe includes a barrel, a plunger, and an adapter for mounting the needle in the distal end of the barrel. The adapter includes a protrusion projecting away from the needle end and into the barrel defining an annular space between the barrel and the protrusion. The plunger and protrusion have complementary surfaces whereby the plunger may grip the adapter for removal of the adapter into the interior of the barrel after use. These complementary surfaces afford initial resistance to further axial movement of the plunger toward the adapter, signalling the user that further axial pressure will permanently lock the plunger and adapter to one another whereby, upon application of full axial pressure on the plunger, the complementary surfaces of the plunger and adapter permanently lock to one another to enable joint unitary movement of the plunger and adapter together with the needle carried by the adapter into the barrel.

Abstract: A needle holder assembly for taking a blood sample with an evacuated tube includes a needle affixed to a hub and a tubular needle holder removably affixed to the hub. A thermoplastic elastomeric sleeve fits snugly over one end of the needle and is punctured by the needle during sampling and is resealed upon withdrawal of the evacuated tube. The invention includes a method to mold the sleeve.

Abstract: A needle-syringe assembly, operable in a normal mode and convertible to a retraction mode, comprises an elongated, generally cylindrical barrel, a plunger slidably mounted in the barrel, and a needle holder carrying a hollow needle on the distal end thereof. The barrel forms a hollow nozzle located at the distal end of the barrel. The plunger forms a coaxial cavity extending therethrough, and the plunger includes a helical slot exposing a proximal portion of the coaxial cavity. The needle holder is slidably mounted in the coaxial cavity of the plunger. During the normal mode, a distal portion of the needle holder is engaged within the nozzle by a taper lock. To switch from the normal mode to the retraction mode, the taper lock is disengaged by rotary movement of the plunger relative to the barrel.

Abstract: A combination syringe and needle are disclosed wherein the needle is mounted to a retractable element which retracts into the body of the syringe plunger. The needle is mounted to the retractor which is spring biased to retract the needle. The retraction is actuated by releasing the forward end of the retractor from engagement with a collet positioned on the forward end of the syringe inner barrel. The collet is configured so as to clamp the forward end of the retractor and only releases the forward end when the collet is pushed forwardly, expanded, and disengages the forward end of the needle retractor.

Abstract: A retractable needle assembly is disclosed. The needle assembly consists of a syringe body, having a needle assembly on one end and a plunger assembly on the opposing end. The needle assembly, which enables and disables fluid communication between the needle and fluid reservoir, comprises a generally cylindrical body sealably disposed within the lower interior of the syringe body. The cylindrical body is rotatable, facilitated by a knurled ring, within the syringe body. Rotation of the cylindrical body causes either enablement or disablement of the needle assembly. Tabs, located on the syringe body are received within notches, separated by one-way and two-way ramps, located on the cylindrical body, such that the ramps facilitate either temporary or permanent disablement of the device. Plunger lock means are also disclosed.

Abstract: An injection assembly, at least comprising a prefilled liquid container with an outflow opening, a piston displaceable in said liquid container with a piston rod and a piston head, an injection needle with a needle fitting which is or can be fixed in the outflow opening, and seling means, said needle fitting and the piston comprising coupling means which can be mutually coupled so as to allow the injection needle to be retracted into the liquid container after use of the assembly, the injection needle further comprising a protection cap with a passage for the needle, which cap is or can be permanently mounted on the outflow opening.

Abstract: Devices for providing polymeric layers on the interior surface of body lumens and spaces are disclosed. The devices can include proximal and distal occlusion elements to define the treatment space and an optical emitter to provide light for a photopolymerization procedure. The devices may include a molding member for providing a thick polymeric gel. Alternatively, devices without a molding member may be used to carry out an interfacial polymerization procedure.

Abstract: A syringe for administering a medicament having a barrel provided with a needle attachment member to which a needle may be mounted and which is retained by a catch at one end of the barrel, and a plunger which is movable in the barrel to expel medicament through the needle attachment member and needle. The plunger is hollow and contains a vacuum and is provided with a gripping member at one end which closes one end of the plunger and which when the plunger is advanced can engage the needle attachment member to releases its catch and withdraw the needle attachment member and mounted needle into the plunger.

Abstract: Method and apparatus associated with safe retraction of medical needles after use. Embodiments are disclosed for combinations comprising medical syringes and self-retracting needle systems. An energy-storing, needle-retracting mechanism comprises an elastic tubing which also is taught perform a plurality of functions comprising the storing of force by which a medical needle is retracted, slidable seals, normally closed valves and dynamic volume control by which fluid regurgitation upon needle retraction is voided. Selective, constrictive control of the internal volume of the tubing when stretched effectively inhibits regurgitant flow from the needle as the tubing relaxes while retracting the needle. In all embodiments, needle retraction is initiated by forces applied in a direction transverse to the long axis of the needle using but a single hand. The syringe may be used in a plurality of modes such as a standard syringe or as a pre-filled syringe.

Abstract: A retractable syringe includes a barrel [212], one end of which comprises a mounting collar[214]. A needle carrier [216] is releasably mounted within the collar [214], and releasably supports a needle cartridge [218]. A hypodermic needle [20] is mounted within the cartridge [218]. The collar [214] has inclined threads [650] in its bore wall for engaging lugs [248] on the carrier [216]. A cap [910] is provided with a flange [960] having a lower surface [962] wider than the proximal end of barrel [212] and dogs [952]. The dogs [952] are sized to insert into threads [650], whereby dogs [952] ride threads [650] to seal surface [962] against the proximal end of barrel [212].

Abstract: A parenteral device having a body slidably supporting a hollow needle. The needle is slidable between a first position in which it is completely retracted within the body and a second position wherein a portion of the needle projects outside of the body. The body further houses a chamber isolated from the needle when the needle is in the first position. Movement of the needle into the second position causes an end of the needle to pierce a wall of the chamber thereby establishing communication between the chamber and needle.

Abstract: A needle-syringe assembly comprises an elongated, generally cylindrical barrel which forms a hollow nozzle located at the distal end of the barrel and which opens into the interior of the barrel. A plunger is slidably mounted in the barrel and forms a longitudinal cavity. A needle holder carries a hollow needle on the distal end, and the needle holder is slidably mounted in the longitudinal cavity of the plunger. The needle holder includes a lateral arm which extends between the plunger cavity and the barrel. A guide means forms a spiral guide surface which extends along a proximal end portion of the barrel for engaging the lateral arm of the needle holder and retracting the needle holder within the barrel in response to relative rotational movement between the barrel and the needle holder.

Abstract: A locking assembly for the plunger of a syringe locks the plunger head inside the body of the syringe when the plunger is depressed at the end of an injection cycle. The inner wall of the syringe body has a constriction which projects inwardly toward the center. The head of the plunger has a catch adapted to cooperate with the constriction and hook the plunger when the plunger is depressed. A flexible shield or seal member is mounted on the plunger head adjacent the catch to prevent trapping of air bubbles under the catch during movement of the plunger while the syringe is being filled with injection fluid and readied for use. The locking assembly is particularly suited for use with a retractable syringe design.

Abstract: A syringe assembly includes a syringe body, and a plunger having a main body and a gasket mounted on its distal end portion. A needle-mounting member is detachably mounted on a distal end portion of the plunger main body. A plunger-engaging mechanism is provided on the needle-mounting member. An engaging member is provided on a distal end of the gasket, for engaging with the plunger-engaging mechanism. The needle-mounting member and the plunger further have a first structure which transmits a torque from the plunger in a direction to release an engagement between the syringe main body and the needle-mounting member to the needle-mounting member, and a second structure which releases an engagement between the engaging member and the plunger-engaging mechanism through a rotation of the plunger in a direction to keep an engagement between the needle-mounting member and the plunger main body.

Abstract: A tamperproof retractable non-reusable syringe has a one piece hollow outer body with a barrel for a slidable plunger, a transition zone and a smaller diameter nose portion. An elongated needle holder and spring combination is installable from the rear of the outer body, guided into the nose portion and held by cooperating inwardly and outwardly facing surfaces oriented in the direction of retraction at the most constricted part of the transition zone where the nose begins. The plunger has an opening with a dislodgable stopper for receiving parts of the retraction mechanism. The stopper and the head of the needle holder are of significantly reduced diameter from the injection fluid chamber to resist blowing out prematurely. In one embodiment the head of the needle holder is surrounded by a separable retainer member which is slidingly removed by contact with the tip of the plunger after the stopper is mostly or fully removed to avoid cumulation of force required for retraction after the injection.

Abstract: A syringe apparatus and process for using the same is provided, the syringe apparatus having a barrel, a plunger movable within the barrel, a needle assembly attached to an end of the barrel and having a passageway therethrough, a deformable base positioned within the barrel, flexible supports included on the deformable base, a spring within the passageway of the needle assembly, a hollow needle passing through the passageway, an enlarged head on the needle, and a rupturable web on an end of the plunger, whereby when the plunger moves through the barrel toward the needle assembly, a fluid can be moved from the barrel through the hollow of the needle, and continued movement of the plunger flexes the supports and moves the deformable base downwardly until such time a sufficient force is imparted to the rupturable web by the enlarged head to tear the web, the deformable base then releasing the needle due to force applied by the spring to project the needle into the interior of the plunger.

Abstract: A kind of safety injector comprises a drug tube assemblage, an injector needle assemblage and a soft release element. A drug tube assemblage includes an outer tube for storing medicament, a hollow push rod with hollow inner portion for accepting the injector needle, and a rubber plunger which is movable together with the hollow push rod and having a frangible sealing element. The injector needle assemblage includes a body which is connected and attached in replaceable way to the top side of the outer tube, an injector needle with its base which is caught in the body in a releasable way, and an elastic element which exerts downwards elastic force to the needle base. After accomplishing the injection, the hollow push rod is continually pushed upwards for very short distance with the soft release element moving together, and the injector needle with its base is forced to separate from the body by the release element.

Abstract: The present invention provides a disposable hypodermic syringe which has an elongate, rigid, hollow chamber with a longitudinal axis, a posterior opening and an anterior opening smaller than the posterior opening. The syringe also has a hollow needle axially disposed within the anterior opening. The first end of the needle is outside the chamber in fluid communication with an opposed second end. The second end of the needle is disposed within the chamber and in fluid communication therewith. The syringe also includes an axially slidable plunger in a fluid-tight seal within the chamber for drawing a fluid into the chamber through the first end of the needle and for expelling the fluid from the chamber through the second end of the needle. The plunger has a anterior end and a posterior end and comprises a grip for the user which extends out of the posterior opening of the chamber and a sloped surface for deflecting the second end of the needle during operation of the syringe.

Abstract: A safety minute dose hypodermic syringe which includes a locating stopper mounted inside the front end of the barrel and connected to the locking tip, which holds the needle cannula, and an arrowhead-like retainer rod fixed secured to the movable rubber stopper and connected to the plunger, the arrowhead-like retainer rod being forced into engagement with an arrowhead-like retaining hole on the locating stopper after the injection, for permitting the locating stopper and the locking tip with the needle cannula to be pulled backwards by the plunger to the inside of the barrel and retained in place by inside annular flanges of the barrel, and for permitting the needle cannula to be deformed by the plunger when the plunger is disconnected from the retainer rod and inserted into the front end of the barrel.

Abstract: An injection assembly, at least comprising a prefilled liquid container with an outflow opening, a piston displaceable in said liquid container with a piston rod and a piston head, an injection needle with a needle fitting which is or can be fixed in the outflow opening, and seling means, said needle fitting and the piston comprising coupling means which can be mutually coupled so as to allow the injection needle to be retracted into the liquid container after use of the assembly, the injection needle further comprising a protection cap with a passage for the needle, which cap is or can be permanently mounted on the outflow opening.

Abstract: A tamperproof retractable non-reusable syringe has a one piece hollow outer body with a barrel for a slidable plunger, a transition zone and a smaller diameter nose portion. An elongated needle holder and spring combination is installable from the rear of the outer body, guided into the nose portion and held by cooperating inwardly and outwardly facing surfaces oriented in the direction of retraction at the most constricted past of the transition zone where the nose begins. The plunger has an opening with a dislodgable stopper for receiving parts of the retraction mechanism. The stopper and the head of the needle holder are of significantly reduced diameter from the injection fluid chamber to resist blowing out prematurely. In one embodiment the head of the needle holder is surrounded by a separable retainer member which is slidingly removed by contact with the tip of the plunger after the stopper is mostly or fully removed to avoid cumulation of force required for retraction after the injection.

Abstract: A safety syringe for preventing "needle stick" injury and/or reuse of the syringe includes a body (100), a plunger (127) mounted within the body, a protuberance (129) on the plunger for connecting the plunger to a needle holder (102) adapted in use to carry a needle at the end of an injection stroke of the plunger whereby subsequent retraction of the plunger withdraws the needle into a shielded position within the body. The syringe includes a braking device (123) disposed between the body (100) and the plunger (127) to retard but not stop the withdrawal of the plunger and needle after the injection stroke. The needle holder (102) includes a radially extending flange (108) which engages with a complementary rib (109) or groove on the syringe until the needle holder is engaged by the protuberance (129) on the plunger.

Abstract: A safety hypodermic syringe in which the needle holder has an arrowhead-like rear retaining hole; the rubber stopper has an arrowhead-like retainer rod that can be forced into engagement with the retaining hole of the needle holder for permitting the needle holder with the needle cannula to be pulled backwards to the inside of the barrel by the plunger; the plunger can be disconnected from the rubber stopper and then inserted into the front end of the barrel to deform the needle cannula when the needle cannula is received on the inside of the barrel.

Abstract: A safety syringe for saving cost includes: a coupling member of arrowhead shape integrally formed with the thin-disk plunger, an annular ring embedded on the plunger to allow the plunger to be slibably held in the syringe for injection use, a syringe cylinder integrally formed with a sleeve portion on a front portion of syringe cylinder, an annular depression formed at the lower portion of said sleeve portion, a hollow needle which comprising a shank portion and a needle portion, said shank portion which connected with needle portion having a bias socket, said shank portion formed integrally a downward depression in it's rear portion from middle portion of the shank portion to somewhere beyond bias socket appropriate whereby upon retraction of the plunger and the coupled needle into the syringe, the needle will be inclined to prevent a further outward protruding of the retracted needle, and said shank portion could be held in the sleeve portion.

Abstract: A single-use hypodermic syringe has barrel (10) and needle holder (20) with a needle receiving passage. The needle holder is detachably mounted in the barrel and defines annular space (30) with the barrel communicating with the needle receiving passage. Piston (32) is mounted in annular space (30) and piston rod (38) is connected to the piston with an amount of lost motion. Needle holder (20) is connectable to the piston rod by means of elastically mounted projection (26) engageable with projection (50) of the piston rod. The amount of the lost motion is greater than the total of the axial lengths of projections (26, 50) of piston rod (38) and needle holder (20).

Abstract: A parenteral device (10) comprising a body (12) having a forward end (26) and a rearward end (34). The forward end (26) is capable of receiving a hollow retractable needle (20) therein so as to project therefrom. The retractable needle (20) is slidable relative to the body (12) and the body (12) also includes a chamber (14) capable of receiving parenteral fluid and capable of being reduced in volume to expel fluid contained therein. The needle (20) is capable of being manually retracted within the body (12) such that the chamber (14) reduces in volume to expel fluid contained therein and such that the needle (20) is retracted to be wholly contained within the body (12).

Abstract: A safety syringe for intravenous injection includes: a hollow needle normally eccentrically held in a sleeve portion formed on a front portion of a syringe, a suction tube replaceably mounted on the sleeve portion for sucking liquid medicine from an ampoule into the syringe, a plunger straightly slidably held in the syringe for injection use, a coupling member retained in the plunger engageable with a biasing socket recessed in a rear needle portion of the hollow needle with the biasing socket, whereby upon pushing of the plunger to the needle by forcibly inserting the coupling member into the biasing socket of the needle when finishing the injection, the biasing socket will be forcibly coupled with the coupling member, and upon retraction of the plunger and the needle into the syringe, the needle will be automatically inclined to prevent an outward protruding of the retracted needle from the syringe for preventing its pricking to the others; with the hollow needle annularly formed with a ratchet-tooth recess

Abstract: A trocar and catheter assembly for automatically disarming the trocar after placement of the catheter into a patient's blood vessel includes a spring urging retraction of the trocar and a releasable retainer mechanism for maintaining the trocar in an extended position during insertion of the catheter into the blood vessel. The catheter is removably mounted to a handle which defines an internal passage. Disengaging the handle from the catheter after placement of the catheter into the blood vessel actuates the releasable retainer mechanism for allowing the trocar to be drawn into the handle passage under the influence of a spring, to enclose the sharpened end of the trocar after use.

Abstract: In a syringe with a hollow cylindrical barrel with one closed end, a plunger having a length longer than the barrel mounted in the barrel for reciprocation, a handle on the distal end of the plunger extending from the barrel and a piston mounted on the opposite end of the plunger in the barrel and a hypodermic needle mounted in the closed end of the barrel being in communication with the interior of the barrel, the improvement of including a hollow tapered section in the barrel adjacent to its closed end, which tapered section in cooperation with the piston end of the plunger is operable to disable the syringe as the piston commences traversing this tapered portion of the barrel.

Abstract: A hypodermic needle system that comprises a hub engaging close-fittingly over the end portion of the cylinder of a syringe and coupling means that consists of flexible legs capable of gripping the proximal end of the needle. In another embodiment, the apparatus also comprises a connecting element that is fixedly attached to the needle and is releasably mounted inside the hub, and the coupling means consists of flexible legs capable of gripping the connecting element. As a result of these configurations, the number of components in the hypodermic syringes constructed according to this invention is limited and the products are relatively inexpensive to manufacture.

Abstract: The syringe of the present invention is ideally supplied to the user in a pre-filled state, with the piston stem protruding from the syringe body and with the cannula covered with a protective cover. Once the disposable safety syringe of the present invention is unwrapped, it may be used for performing an injection in the usual way. As the last bit of fluid is injected through the cannula, the piston engages the proximal portion of the needle axial translating structure. The piston stem is then withdrawn back through the syringe body, pulling the cannula inside the syringe body. The piston is prevented from exiting the syringe body because of the presence of a flange at the proximal end of the syringe. The piston stem is then quickly removable from the piston by disengaging the large-pitch thread with which it was attached to the piston, which eliminates the possibility of inadvertent proximal motion of the piston.

Abstract: A safety syringe includes: a hollow needle assembly having a hollow needle portion detachably coupled to a shank portion embedded in a sleeve portion of a syringe and having a needle head portion formed on a rear portion of the shank portion, and a plunger slidably held in the syringe and having a biasing socket recessed in the plunger for engaging the needle head portion of the needle assembly for a coupling of the needle assembly with the plunger for a retraction into the syringe for obliquely biasing the needle portion for preventing re-protrusion of the needle outwardly, the shank portion having a pair of bars engageable with any one of the two wedged extensions formed in a cylindrical recess in the sleeve portion for preventing a rotation of the shank portion in the sleeve portion for reliably coupling the hollow needle portion on the shank portion.

Abstract: A retractable needle syringe includes a barrel having an inside surface defining a chamber, an open proximal end and a distal end. An elongate plunger is slidably positioned in fluid-tight engagement with the inside surface of the barrel. The plunger includes a distal end, a proximal end and a radially directed projection on its distal end. A movable carrier is positioned in fluid-tight engagement with the inside surface of the barrel. The carrier includes an outside surface, a distal end, a proximal end, and a passageway therethrough in fluid communication with the chamber. The proximal end of the carrier includes an open-ended groove which is sized and shaped to receive the plunger projection. The groove includes an axial portion and a circumferential portion. The plunger is movable axially so that the plunger projection can enter and exit the axial portion of the groove.

Abstract: A retractable needle medical assembly includes a barrel and a plunger assembly defining an internal passageway. A sleeve is mounted to the barrel and extends into the internal passageway defined by the plunger assembly. An actuator member, in the form of an actuator tube, is mounted within the sleeve toward its rearward end, and includes a trigger which can either be manually engaged by the user or engaged by the plunger when the plunger is in its full-forward position relative to the barrel. A hub is received within the sleeve passage, and a spring bears against the hub so as to urge the hub to a rearward, retracted position. The actuator tube engages the hub so as to maintain the hub in a forward position, and a needle assembly consisting of a needle and a head is engaged with the hub by the user prior to operation of the assembly.

Abstract: A syringe unit arranged for a single-use only. The syringe unit comprises a barrel substantially closed at one end by a nozzle and open at the other end. A plunger having a piston is received in the barrel and is movable therealong. A fluid chamber is defined within the barrel between the piston and the nozzle. A syringe needle is releasably secured to the barrel with the cannula extending outwardly from the barrel and communicating with the fluid chamber and is releasable upon rotation relative to the barrel. An engaging means is provided for releasably engaging the piston with the needle whereby when so engaged the piston can be rotated to effect release of the needle from the barrel and then retracted to move the needle into a protective position within the barrel. The engaging means comprises a socket defined in a cavity provided in the needle, and a projection provided on the piston for reception in the socket and engagement therewith.

Abstract: Injection syringe of disposable type, including a cylinder (91), in which a piston is displaceable in and out respectively, a piston rod (3) having a press plate (12), and an injection needle (4) at the end of the syringe cylinder (1). The syringe needle (4) is mounted from inside the syringe cylinder (1) and is releasably connected (5, 9) to the syringe cylinder (1). The syringe needle (4) or the carrier (5) thereof is formed with one or more blocking ratchets (6) which cooperate with the syringe piston (2) or the piston rod (3), and which blocks the piston against being retracted after the sole injection is made, so that the syringe needle (4) becomes retracted into the inner of the syringe cylinder (1) upon withdrawal of the piston (2) after the injection has taken place.

Abstract: Disposable medical syringe 10, consisting of a hollow syringe chamber 12, for receiving a piston 14, traversing a displaceable extendible path 16, in the chamber, a rod 18, axially coupled to one end of the piston 14, and at the other end to a thumb engaging surface 20, a stop member 22, in the hollow chamber 12, at a proximal end and adjacent to the rod 18 for terminating one end of the displaceable extendible path 16, a cap 30, securely but removably mounted at a distal end of the hollow chamber from the one end and having a tubular coupling 32, for receiving in frictional engagement a syringe needle 34, a supporting body for axially centering support of the needle within the hollow chamber and securely mounted to an inner end of the needle 34, a distal end of the needle 34, adapted for injection in a patient for serving to pass fluid received from the hollow chamber to pass into the patient, an annular projection 38 disposed about the tubular coupling 32, for latch-engaging the distal end of the needle the

Abstract: The syringe includes a barrel, a plunger, and an adapter for mounting the needle in the distal end of the barrel. The adapter includes a protrusion projecting away from the needle end and into the barrel defining an annular space between the barrel and the protrusion. The plunger and protrusion have complementary surfaces whereby the plunger may grip the adapter for removal of the adapter into the interior of the barrel after use. These complementary surfaces afford initial resistance to further axial movement of the plunger toward the adapter, signalling the user that further axial pressure will permanently lock the plunger and adapter to one another whereby, upon application of full axial pressure on the plunger, the complementary surfaces of the plunger and adapter permanently lock to one another to enable joint unitary movement of the plunger and adapter together with the needle carried by the adapter into the barrel.