Abstract: A disposable syringe has a needle seat with an upper segment adapted to be fitted with a needle cannula, and a lower segment retained in a passage of a barrel. A plunger has a stem portion movable in the passage, a deformable surrounding engaging portion in sealing contact with the passage so as to be moved by the stem portion to a position of use, and a surrounding abutting head which is moved towards and which is held by a grip segment in the needle seat when the surrounding engaging portion is depressed by an edge portion of the needle seat by virtue of a continuing depression force of the plunger, thereby permitting the needle seat to be brought into the passage for disposal.

Abstract: A safety hypodermic syringe in which the plunger is breakable into a front part and a rear part after the service of the safety hypodermic syringe so that the front part can be kept with the needle assembly inside the barrel and the rear part can be inserted into the front side of the barrel and capped on the needle cannula of the needle assembly inside the barrel to prevent contamination.

Abstract: A safety syringe includes a flexible holder-supporting seat that is sleeved around and that clamps a needle holder within a front end portion of a syringe barrel. A flexible sealing member seals an open front end of a plunger so as to define a vacuum chamber in the plunger. When the plunger moves within the barrel to a front limit position, a holder-retaining front portion of the sealing member engages and retains the needle holder thereon, and the plunger pushes the holder-supporting seat to separate from the needle holder such that the sealing member and the needle holder move rearward within the syringe barrel due to negative pressure produced in the plunger, thereby retracting a needle into the syringe, barrel.

Abstract: A method for withdrawing a fluid sample from a patient is disclosed comprising the steps of: a) providing a sampling device (10) having a housing (20) and a needle (40) having a sharpened tip for piercing the skin of the patient; b) withdrawing fluid from the patient into the housing; c) retracting the needle so that the sharpened tip of the needle is enclosed within the housing; and d) expelling the fluid from the housing after the needle is retracted.

Abstract: A single use syringe has a needle which is biased back into the barrel but which is prevented from doing so by a holding means which has an outer part and an inner part which are connected together by a frangible portion. The needle is held by the inner part. When the plunger is pushed towards the front of the barrel, it contacts the outer part and pushes it forwardly which stretches the frangible portion until it bursts. When the frangible portion breaks, the inner portion containing the needle is released and can shoot back into a hollow portion in the plunger through the frangible portion of the plunger head.

Abstract: A safety shield system for a needle cannula of a pen needle injector or similar device, wherein a safety shield may be retracted from a first position enclosing the needle cannula to a second position exposing the needle cannula for injection. The safety shield system permits retraction of the safety shield during use, but extends the shield enclosing the needle cannula in a locked position following use. The shield system is utilized with a pen needle injector having a double-ended needle cannula mounted in a hub member received on an open end of the pen needle injector. The assembly is disposed of by removing the system and storing the assembly in the cup-shaped top cap enclosing the exposed end of the needle cannula within the cap. The top cap includes internal radial ribs preventing retraction of the shield prior to removing the top cap preventing inadvertently piercing the top cap during assembly.

Abstract: The mechanism includes: an urging means for urging an inner needle (12) to the side opposite to an outer needle (11) with respect to the axial direction of a holder sleeve (1) for holding the inner needle (12); an actuator (6) which is positioned between the urging means (8) and inner needle (12), moves together with the inner needle (12) and has a puncture position retainer for keeping the inner needle (12) and outer needle (11) ready for puncture and an inner needle retraction actuating portion for allowing for the retraction actuation of the inner needle (12); and a slit (2) for assuring the path of movement of the actuator (6). The puncture position retainer has a puncture position engagement portion whereby the actuator (6) is engaged with the holder sleeve (1) at a position on the outer needle side (11).

Abstract: A safety syringe has a hollow barrel, a needle hub and a plunger. The hollow barrel has a distal end, a proximal end, a cone-shaped end formed on the proximal end with an opening. The plunger has a proximal end and a needle retractor formed on the proximal end. The needle hub with a needle is detachably mounted inside the proximal end of the hollow barrel and has an axial fitting to engage the plunger. When the safety syringe is used, the plunger connects to the needle hub and is pulled toward the distal end of the hollow barrel to draw the needle hub with the needle inside the hollow barrel to keep people from being hurt or infected by an exposed needle.

Abstract: A retractable needle assembly for use in medical procedures comprising a needle assembly including a hub, a hollow needle passing through the hub and projecting from the posterior end of the hub. A tubular sheath having a longitudinal slot extending along a portion of its length. A post attached to the hub and positioned to project through said longitudinal slot such that the needle and hub assembly may slide along the length of the sheath from a position exposing said needle to a retracted position within said sheath. A means for reversibly locking the needle assembly in the retracted position, a means for reversibly locking the needle in the in the exposed position and means for permanently locking the needle in the retracted position. Several different embodiments for locking the needle assembly in position both reversibly or permanently are disclosed.

Abstract: A safety syringe has a barrel, a needle hub movably received in the barrel and having a hollow cone with a flange formed on an inner periphery of the hollow cone and a plunger with a hook formed to correspond to the flange of the needle hub such that when the hook engages with the flange of the needle hub, the needle hub is ready to be pulled back into the barrel by a rearward movement of the plunger so that the syringe is ready to be disposed of safely.

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: Sharp safe hydraulic retractable syringe that is supplied with a hypodermic needle (4) fully housed within an elongated hollow barrel (2) which cannot be used until the plunger rod stop (16) has been removed and the plunger rod (1) has been pushed into the loading position to receive the required liquid into the elongated hollow barrel (2). The hydraulic retractable syringe assembly is preceded by a retractable mechanism (6-15) that is pre-assembled. The mechanism is contained by a three-legged retaining clip (11) to hold twin conical helical shape springs (14-14d) separated by a spring separation plate (15) within two spring retaining cups (12-13).

Abstract: A safety syringe is disclosed. A plurality of axial slits are formed in the outer wall of the unidirectional buckling chamber of the seat. An inner wall of the unidirectional buckling chamber has a second unidirectional buckling lip. A buckling head at a front end of the rod head of the push rod is installed with a unidirectional buckling lip; the third unidirectional buckling lip is installed with a plurality of slits so that the third unidirectional buckling lip is elastic. Thereby, by the axial slits of the unidirectional buckling chamber and the slits of the third unidirectional buckling lip, when the push rod is pushed to a foremost end, the buckling head at the front end of the rod head is pushed into the unidirectional buckling chamber at the rear end of the rod head of the push rod.

Abstract: A hypodermic implant device, comprising a barrel; an upper piston segment engaged with an inner wall of the barrel; an axially aligned needle extendably distally out of the barrel for insertion into an object when the upper piston segment is moved distally within the body; a lower piston segment push rod in alignment with the needle, so that upon distal movement of the lower piston segment, the push rod moves distally through the needle expelling a releasable implant housed in the needle; and a means for retraction of the needle into a needle receptacle in the barrel.

Abstract: A retractable needle assembly for use in medical procedures, comprising: a needle assembly including a hub, a hollow needle passing through the hub and projecting from the posterior end of the hub, and a tubular sleeve having a radially directed hole therethrough connected with the anterior end of the hub; a tubular sheath having a wall with a radially directed hole therethrough, wherein the needle assembly is positioned within the tubular sheath so that it may be moved reversibly between an exposed position and a retracted position; a means for reversibly locking the needle assembly in its exposed position; a means for reversibly locking the needle assembly in its retracted position; and a means for permanently locking the needle assembly in its retracted position, said permanent locking means comprising a radially-directed peg mounted on an exterior surface of the tubular sheath so that one end of the radially-directed peg is adapted to be pushed inwardly through the hole in the wall of the tubular she

Abstract: The invention refers to a syringe of single-use type intended for injection or lab tests with an injection needle slidable into the syringe after usage. The intention with this is to eliminate the risk for prick injuries when the syringe is handled after usage. A design of a single-use syringe such that the needle becomes kept in the interior of the syringe after usage has proved to be involved by different kinds of complications and has made the syringe complicated and expensive to manufacture. An uncomplicated and reliable syringe of the kind stated in the introduction is achieved according to the invention by the fact that the plunger (2) of the syringe is provided with a coupling device (12) designed such that in the completely pushed in position of the plunger the rear part of the injection needle (6) is coupled to the plunger (2) and follows the plunger when the plunger is withdrawn.

Abstract: The present invention is directed to syringes that have needles that retract after an injection to provide safe syringes which reduce the possibility of a sharps injury through retraction of the needle after use into the barrel of the syringe. The syringe includes a barrel, a needle assembly positioned in the hollow body, a fluid retention system positioned in the hollow body, and a plunger assembly that moves in the hollow body. A fluid retention system retains in the syringe any fluid remaining in the needle after the plunger assembly approaches tha distal end of the hollow body. The fluid retention system includes a variable volume vacuum cavity in fluid communication with the needle passage, the vaccum cavity expanding prior to retraction of the needle assembly and providing a pressure drop in the needle, tending to draw into the hollow body any fluid remaining in the needle.

Abstract: The invention provides a safety syringe for extracting blood, with retractable or removable needle that can be retracted into the syringe body or removed after use and safety locks that lock the retractable needle in an extended position during use and in a retracted position after use to ensure that the syringe is not reused or that the needle is not inadvertently extended. When retracted, the needle assembly is cocked at an angle identifying the syringe as used and adding further protection to prevent the needle from being inadvertently extended and exposed from the tube. These safety features work in conjunction to enhance the usability and increase the safety of the syringe. Thereby protecting medical workers from being injured by an exposed needle or contaminated by disease or infection from contact with the patient's blood present on a used needle.

Abstract: A sealed sterile intravenous catheter and needle assembly providing a substantially closed and sterile environment. The sealed sterile intravenous catheter is removably secured to a needle assembly and includes a tubular catheter portion, a catheter nozzle portion, and a gel cap portion aligned axially about a central axis to form a sealed flow passageway therethru. The gel cap portion includes a hollow gel cap hub having a gel cap formed of an elastic material to substantially seal the gel cap portion of the sealed catheter. Additionally, the needle assembly includes a needle configured to matingly cooperate with the sealed catheter assembly and pierce through the gel cap and sealed flow passageway of the sealed catheter assembly in a fully extended position. The needle will also be structured to fully retract for safe disposal after use.

Abstract: The present invention relates to a syringe (10) for administering injections of medicinal fluids to a patient or withdrawal of fluid, such as blood from a patient. More specifically the present invention is a syringe device (10) for injecting medication or withdrawing fluid, wherein after use the needle (60) is shielded (15) against inadvertent contact to prevent needle sticks.

Abstract: Pre-filled injection ampoules for administering a readily-available dose of fluid medication, are provided with a retractable needle. The needle is held in a projecting configuration from a barrel against a rearward bias exerted on the needle by a spring located within a spring housing. A piston is positioned within the barrel for expelling the fluid medication therefrom. The piston is configured to release the needle after completion of an injection stroke and to receive the needle in an internal cavity. In alternative embodiments, a retractable-needle injection device includes a housing for receiving a pre-filled medication cartridge of the type having a slidable piston positioned therein. A stationary plunger is located within the housing for maintaining the piston at a fixed location as the cartridge is urged into the housing to administer an injection. After the end of an injection stroke, the cartridge is further urged into the housing to release a effectuate retraction.

Abstract: A needle-stick safety syringe includes an inner tubular body, plunger, and needle extending from a distal end of said inner tubular body, an outer tubular housing concentrically and slidingly surrounding at least a portion of the inner tubular body and biased apart from the inner tubular body. A recess is defined within an interior wall surface of the outer tubular housing, and a latch attached to a distal end of the inner tubular body. The latch includes a ring-shaped collar attached to the distal end of the inner tubular body and includes a cantilevered push-stop. A portion of the cantilevered push-stop is sized to fit within the recess when the latch is sufficiently disposed within the outer tubular housing.

Abstract: A safety syringe has a hollow barrel, a plug, a cord, a needle hub and a plunger. The hollow barrel has a distal open end, a proximal open end, a distal annular rib defined inside the proximal open end, a central annular rib defined inside the hollow barrel. The plug is detachably mounted inside the proximal open end of the hollow barrel. The needle hub is mounted in the plug. The plunger has a push rod and a seal mounted on the push rod and is received inside the hollow barrel. The cord connects to the plug and the seal. When using the safety syringe, the plunger pulls the cord connected to the plug, so the needle hub is pulled inside the hollow barrel to keep people from being hurt by an exposed needle.

Abstract: A disposable syringe comprises a syringe body (1), a plunger (40) mounted on a stem (50) slidable inside the syringe body (1), and an injection needle (10) integral with a needle-carrier (11) engageable with the fore end (2) of the syringe body (1) or the plunger, retaining means (20, 23, 24) able to retain spring means (30) under compression being provided integrally with the syringe body (1) and engagement means (59) able to cooperate with the retaining means (23) to release the spring means (30), when the plunger (40) has reached the end of its stroke, being provided integrally with said stem (50), so that the spring means (30) can act on the stem (50) to cause retraction thereof into the retracted position.

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: The invention provides a safety syringe, which has a cylinder (11), a syringe needle (21), a needle holder (31) associated to the cylinder and adapted to hold the syringe needle, and a plunger (41) associated to the cylinder (11), wherein the plunger (41) comprises a piston (42) and serves to inject a filling of the cylinder (11) via the syringe needle (21), and wherein the plunger (41) can be coupled with the needle holder (31) arranged in the region of a front hole (12) of the cylinder (11), to retract the needle holder (31) together with syringe needle (21) into the cylinder (11) by pulling the plunger (41) once coupled to the needle holder (31) is retracted into the cylinder by rotating the plunger (41) and pulling the plunger (41) aft thereby pulling the needle holder (31) into the cylinder (11). Then the aft end of the plunger (41) is broken off, and a removable cap (49) from the aft end of the plunger (41) may be placed over the opening in the forward end of the cylinder (11).

Abstract: A safety hypodermic syringe includes a barrel and a base is movably received in the barrel. A cylindrical connection piece is engaged with the engaging recess. A needle cannula unit is fixed connected to the base and extends out from the barrel. A plunger has an insertion which is inserted through the hole in the connection piece and into the passage in the base. The insertion is securely engaged with the connection piece. A breaking groove is defined in an outer periphery of the plunger and located close to the second end of the plunger. The base together with the needle cannula unit are pulled in the barrel after injection and the plunger is broken to leave the needle cannula unit in the barrel.

Abstract: The syringe includes an adapter threaded into the distal end of the barrel and a plunger axially movable within the barrel. A stop and catch cooperate between the adapter and barrel end to prevent rotation of the adapter. Adapter and plunger engagement structures are carried by the plunger and adapter, respectively, to enable joint rotation of the plunger and adapter relative to the barrel to unthread the adapter from the barrel end and withdraw the adapter and needle carried thereby jointly with the plunger into the interior of the barrel. The engagement structures also include an element for engaging the catch in response to axial movement of the plunger to release the adapter for rotational movement relative to the barrel end and subsequent withdrawal of the adapter and needle carried thereby into the barrel.

Abstract: A syringe holder has a barrel (1) with a sleeve (2) screwed over its forward end. A syringe is entered into the rear end of the barrel (1), needle (20) first, with the sleeve (2) at its rearmost position. A coned needle cap (23) snaps through an aperture (13) at the forward end of the sleeve as a flange (18) at the rear of the syringe tube (17) abuts the rear end of the barrel (1). Screwing the sleeve (2) forwards eases the cap (23) off the needle (20), and screwing it back again leaves the assembly ready to use. The barrel (1) has finger grips (10) to facilitate thumb operation of the syringe plunger.

Abstract: A safety syringe has a hollow barrel, a cord, a needle hub and a plunger. The hollow barrel has a distal open end, a proximal open end, a distal annular rib defined on the inside surface of the proximal open end, a central annular rib defined on the inside surface of the hollow barrel. The needle hub is detachably engaged inside the proximal open end of the hollow barrel and has a needle mounted on the needle hub. The plunger has a push rod and a seal mounted on the push rod, and the seal is slidably mounted inside the hollow barrel. The cord is connected to the needle hub and the seal. When the safety syringe is used, the plunger pulls the cord connected to the needle hub, so the needle hub with the needle is pulled inside the hollow barrel to keep people from being hurt or infected by an exposed.

Abstract: A safety syringe includes: a syringe cylinder having a plurality of sleeve ribs formed in a sleeve portion of the syringe cylinder, a needle device having a needle detachably coupled on an shank portion which is provided with a plurality of shank ribs on the shank portion to be engaged with the sleeve ribs in the sleeve portion, with the needle device retractable in and automatically biased in the syringe cylinder to prevent outward protruding of used needle; whereby upon external connecting and rotative coupling of the needle on the shank portion, the shank portion will be locked without being rotatable, thereby enhancing a smooth coupling of the needle on the shank portion of the needle device.

Abstract: A retractable syringe needle comprising a needle assembly including: a needle-holding mechanism comprising a hub and an annular sleeve connected with said hub; a hypodermic needle extending through said hub; and a pin directly connected to the exterior surface of said annular sleeve; a container having a tubular wall with a longitudinal slot therein, said container having a first open end adapted to receive a syringe barrel and a second open end adapted to admit a syringe needle, said container having said needle assembly mounted therein so that the pin is slidably engaged by the longitudinal slot, so that said needle assembly may be moved from a first position where the needle is within the container to a second position where the needle is exposed by sliding the pin toward the second open end of the container and causing the needle to pass through the second open end; a means for biasing the needle assembly toward said first position; and a means for releasably engaging the pin at a defined location in said

Abstract: A safety needle-bearing medical advice (10) is provided. Specifically, a safety device for injecting medicinal fluid into a patient is provided. The device comprises a hollow housing (20), a needle assembly (40) and a plunger (30). The needle assembly (40) releasably retains a needle (45) in an extended position in which the sharpened tip of the needle is exposed for use. At the end of an injection stroke, the plunger (30) engages the needle assembly (40), such that the needle (45) is released and retracted into a cavity (38) within the plunger. The device (10) includes structure for reducing the dead-space volume, which represents the amount a fluid remaining in the device at the end of an injection stroke. In addition, preferably the device (10) includes structure for minimizing the volume of potential air bubbles trapped in the medicinal fluid prior to an injection.

Abstract: A hypodermic syringe having a barrel with an open end, a base end and an internal bore; a needle assembly including a needle base member located inside the bore and releasably engaged with the base end and a needle which protrudes through the base end of the barrel; a plunger slidable within the bore, the plunger having a piston releasably engaged therewith and a chamber having air evacuated therefrom, the chamber being scaled at one end by the piston; wherein the piston includes means for engaging the needle base member such that in use when the plunger is depressed and the piston approaches the base end of the barrel, the piston can engage the needle base member, the needle base member is released from the base end and the piston is released from the plunger such that the piston needle base member and needle can be forced into the chamber by atmospheric pressure, wherein the needle base member is releasably engaged with the base end of the barrel by means of a split ring movable from an engagement position

Abstract: An automatically retractable safety syringe includes a needle assembly consisting of a connula, a needle hub and a rubber O-ring, a needle cap, a retracting spring, a breakable and retractable plunger, a plunger gasket and a medicine barrel; in accordance with the structure of the said automatically retractable safety syringe of the present invention, since the breakable plunger is assembled inside the medicine barrel, after being pushed all the way to the end, it is forced to break automatically into two parts for reducing it's length so as to provide enough space for the retracting spring to drive the needle assembly moving along the sliding passages for accomplishing an automatically retracting action.

Abstract: A safety hypodermic syringe having a flexible safety cap covered on a hollow stopper around the arrowhead tip of the plunger, such that liquid medicine is completely forced out of the barrel through the needle cannula before forcing the arrowhead tip of the plunger into engagement with the connector holding the needle hub and the needle cannula for enabling the needle cannula to be received inside the barrel after the service of the safety hypodermis syringe.

Abstract: A syringe apparatus and process is provided for retracting a needle from a hypodermic syringe following the completion of an injection. The hypodermic syringe has a plunger which, upon completion of the injection, is forced downwardly against a needle support deformable base, severing sacrificial supports. An end portion of the needle tears a base portion of the plunger and propels the needle into a hollow region of the plunger such that the needle is contained entirely within the plunger.

Abstract: A syringe assembly includes a barrel having a chamber for retaining fluid. The barrel has an open proximal end, a distal end and an elongated tip extending from the distal end having a passageway therethrough in fluid communication with the chamber. The tip has a diameter at its distal end of less than about 3.8 mm and a side wall tapered proximally outwardly at a taper of from 4% to 8%. A plunger rod includes an elongated body portion having a proximal end, a distal end and a stopper at the distal end. The stopper is slidably positioned in fluid-tight engagement in the barrel. An elongated projection extending distally from the distal end of the plunger rod is shaped to fit within the passageway of the elongated tip. Structure is provided for preventing proximal motion of the plunger rod with respect to the barrel after distal motion of the stopper to expel fluid through the passageway.

Abstract: A syringe has a retractable needle and a barrel having an open proximal end and an open distal end defining a receiver with an inward shoulder. The barrel has a hollow bore, an elongate plunger with a proximal end and a distal open end with a cavity therewithin. A stopper occludes the open end of the cavity. The syringe has an elongate hub with a proximal flange. The hub is within and sized for slidable movement within the receiver at the distal end of the barrel with the flange defining a distal end of a chamber. There is a sleeve sized to fit with a clearance about the hub disposed between the shoulder and the flange when the hub is in the receiver, the sleeve having a sharpened proximal end disposed against the flange. The needle has a pointed distal end and a proximal end connected to the passageway of the hub with the pointed end of the needle extending outwardly.

Abstract: A syringe device includes a barrel in which a stopper connected to a plunger is movably received, and an engaging section extends from an end of the barrel. A base member is disengagably received in an engaging section of the barrel and a needle cannula is connected to the base member. The stopper has a protrusion which is engaged with a recess in the base member when the stopper is moved to a extreme position when pushing the plunger. The base member is disengaged from the engaging section and moved into the barrel together with the stopper when the plunger is pulled backward. A pushing device is located between the base member and the stopper to tilt the base member in the barrel.

Abstract: A retractable needle cannula module for connecting to a conventional syringe has a biased spring needle cannula. The spring needle cannula is biased and locked to prevent the spring needle cannula from pulling the needle into the hub chamber. After medicament has been injected into a body, the spring needle cannula is released and trapped inside the hub chamber.

Abstract: Sharp safe hydraulic retractable syringe that is supplied with a hypodermic needle (4) fully housed within an elongated hollow barrel (2) which cannot be used until the plunger rod stop (16) has been removed and the plunger rod (1) has been pushed into the loading position to receive the required liquid into the elongated hollow barrel (2).

Abstract: The invention concerns a single-use device for injecting a dose of a medicinal product, comprising a syringe (1) and a piston rod (7) provided with a collar (9) housed in a casing formed of two parts, a front part (11) and a rear part (10), fitted inside each other and capable of sliding in relation to each other over a short traverse between two positions, a retracted position and a forward position. This device additionally includes means (35) for supporting the collar (9) of the piston rod (7) arranged so as to permit, on the one hand, injection under the effect of a propulsion spring (50) in the forward position of the parts (10, 11) of the casing and, on the other hand, backward movement of the syringe (1) inside the casing, after injection, in the retracted position of the said parts of the casing. It also includes means (28, 29) for viewing the supporting means (35) at the end of injection.

Abstract: A method and apparatus for filling a syringe-type applicator having multiple material reservoirs are disclosed. The method and apparatus permits the individual component reservoirs to be simultaneously filled without risk of contamination or unintentional component mixing. The method and apparatus are particularly useful in the preparation and delivery of multiple component tissue sealants such a fibrinogen adhesive compositions.

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 needle-bearing device for injecting medicinal fluid from a pre-filled vial is provided. After use, the needle is retracted into the body of the device to prevent inadvertent contact with the sharpened end of the needle. In one embodiment, the invention provides a manually actuable button that effectuates retraction of the needle after use. In another embodiment, retraction is effectuated automatically after the injection is complete.

Abstract: A retractable needle assembly for use in medical procedures comprising a needle assembly including a hub, a hollow needle passing through the hub and projecting from the posterior end of the hub. A tubular sheath having a longitudinal slot extending along a portion of its length A post attached to the hub and positioned to project through said longitudinal slot such that the needle and hub assembly may slide along the length of the sheath from a position exposing said needle to a retracted position within said sheath. A means for reversibly locking the needle assembly in the retracted position, a means for reversibly locking the needle in the in the exposed position and means for permanently locking the needle in the retracted position. Several different embodiments for locking the needle assembly in position both reversibly or permanently are disclosed.

Abstract: A hypodermic syringe with a selectively retractable includes an barrel having an proximal end and a distal end that defines a receiver with a shoulder. The barrel has a hollow bore therethrough and the receiver includes a plurality of inwardly projecting cams distal to the shoulder. There is an elongate plunger with a proximal end and a distal end sized to fit slidably within the bore of the barrel to define a chamber. There is a hub with a flange and a stem that has a passageway therethrough extending distally into the receiver. The stem has distal recesses disposed to engage the projecting cams so that the hub is retained with the distal end of the stem in the receiver. The syringe includes a needle mounted in the passageway in the hub with the distal point projecting distally and the fluid path communicates with the chamber. There is a clip about the elongate plunger initially allowing movement of the plunger for drawing and expelling fluid.

Abstract: A needle holder used in a safety hypodermic syringe, including a hollow cylindrical body having a rear coupling structure adapted to receive a front retaining tip of the plunger of the safety hypodermic syringe with which the needle holder is used, wherein the needle holder has at least one movable unit and at least one engagement unit respectively connected to the hollow cylindrical body, the at least one movable unit being alternatively shifted between an extended-output status where the at least one movable unit is respectively disengaged from the at least one engagement unit, and an inwardly squeezed status where the at least one movable unit is respectively forced by an external force into engagement with the at least one engagement unit.

Abstract: A cap operated retractable medical device has an outer body with a hingedly connected outer cap which moves between an open and a closed position. The device is used as a blood sampler with a conventional collection tube normally used in such devices. A movable member is entirely enclosed within the outer body. A sliding interference or friction fit holds a retraction body within the mouth of the movable member and also holds the front end of the movable member within the outer body positioned within the retraction body adjacent a stop. A double ended needle is installed in the retraction body. Camming protrusions on the cap engage the back of the movable member to move it forward as the cap is closed thereby triggering retraction of the retraction body and its double ended needle entirely within the outer body. Once the cap is closed with the double ended needle safely inside, the device can be safely handled. The device is compact. It can be as short as the needles it will safely contain.