Abstract: An injection device with a travelling clutch which can be shifted between two different positions by the activation of an injection button. In the first position, the injection button and the driver is allowed to rotate relatively to the piston rod, which is blocked from rotation by the clicker element. In the second position, the drive sleeve and the injection button is axially movable while the piston rod is allowed to rotate.

Abstract: A injection system having a syringe body which defines a pumping chamber. A syringe plunger is located in the pumping chamber and is adapted for reciprocal motion within the pumping chamber. The syringe plunger includes a capture member projecting outwardly in a proximal direction. An actuating shaft is coupled to the syringe plunger and is movable through the syringe body to control movement of the syringe plunger. The capture member is adapted to flex radially outwardly when contacted by the actuating shaft to form a releasable engagement with the actuating shaft when the actuating shaft and the capture member are in an engagement position. A release actuator is disposed proximal to the syringe body, and the capture member releases the actuating shaft upon engagement with the release actuator.

Abstract: The present invention relates to a syringe used in fat transplantation comprising: a cylinder having a coupling part formed at one side thereof such that a cannula, a needle or a cap is detachably coupled, an open part formed at the other end, and a flange formed at an outer periphery of the open part; a piston head installed in the cylinder; and a plunger for reciprocating the piston head, characterized in that the flange is formed separately from the cylinder, and a flange attachment structure is formed between the flange and the cylinder to detach the flange from the cylinder, wherein the flange attachment structure is comprised of a hooking projection projecting from an outer periphery of the cylinder, an insertion groove formed in an inner periphery of the flange such that the hooking projection is inserted, and a hooking groove integrally formed with the insertion groove such that the hooking projection is hooked.

Abstract: Embodiments disclosed herein generally describe a medication delivery system. The medication delivery system includes a barrel, a plunger assembly, a dosage selection device, and a force producing element. The plunger assembly is disposed within the barrel. The force producing element can force the plunger assembly from the barrel. The user can select one or two or more dosages with a dosage selection device. The user selects the dosage; then the medication delivery system delivers the same dosage repeatedly. Further, with the force producing element, the user need only depress the plunger assembly into the barrel and does not need to extract the plunger assembly. This allows the user to use only one hand with the medication delivery system.

Abstract: A substance delivery device including a casing formed by a first casing portion for a substance reservoir including a piston, a piston rod movable in an advancing direction to move the piston toward an outlet of the reservoir to deliver the substance, a dosing element which performs a dosing movement relative to the casing and, together with the piston rod, performs a delivery movement in the advancing direction, a dosing member connected to the dosing element wherein the dosing member is movable generally transversely to the piston rod to enable the piston rod to be moved counter to the advancing direction, a resetting element movably connected to the first casing portion to perform dosing member and piston rod disengaging and engaging movements, and a cam gear coupling the resetting element to the dosing member, wherein the cam gear forms a guiding rail on which the dosing member is guided.

Abstract: A syringe assembly having passive disabling structure includes a barrel and a plunger rod assembly. The plunger rod assembly includes a plunger rod and a stopper connected by an indexing locking element. The number of strokes of the syringe plunger before the stopper is locked into the barrel rendering the syringe assembly unusable is determined by the number of detents on the plunger rod and stopper which engage the locking mechanism. Upon completion of the final delivery stroke, any attempt to withdraw the plunger rod from the barrel will cause the locking element to engage the barrel and trap the stopper in the barrel preventing further use of the syringe.

Abstract: A plunger rod useful for sliding a piston inserted in a syringe barrel has a threaded portion formed at an end of the plunger rod to attach the piston on the plunger rod and a flange formed at an opposite end of the plunger rod. The threaded portion and the flange are integrally connected together by a cylindrical member having an outer diameter such that the cylindrical member can be inserted with contact slidability in the syringe barrel, for example, an outer diameter equal to or slightly smaller than an inner diameter of the syringe barrel.

Abstract: A hand-held aspiration apparatus includes a handle configured for suspending and using the syringe with a single hand. The handle includes pivotally connected first and second members. The members of the handle may be pivotally connected at intermediate positions along the lengths thereof. The first member is associated with, and may be pivotally connected to, a syringe barrel, while the second member is associated with, and may be pivotally connected to, a syringe plunger. The members are configured and associated with one another in such a way that movement of portions thereof toward each other moves the plunger proximally through the barrel, which may create a vacuum in the barrel that may facilitate aspiration, and that movement of portions of the members away from one another moves the plunger distally through the barrel. The aspiration apparatus may be configured for a single-use (i.e., it may be disposable). Applications of use and methods of using a hand-held syringe are also disclosed.

Abstract: A backer plate adapter (10) for a syringe plunger (20). The backer plate adapter (10) includes a first end (26) adapted to be engaged with a syringe plunger (20), wherein a portion of said first end (26) defines a recess. The backer plate adapter (10) further includes a second end (28) having an extension (12) protruding therefrom. The extension (12) includes a shaft portion (14) and a cap portion (16). A cross-section of the cap portion (16) has a first shape and the recess defined by said first end (26) has a shape that is complementary to the first shape.

Abstract: The invention relates to an injector device for a syringe, the syringe including a plunger movably receivable by a barrel, the plunger having a push flange and the barrel defining an interior to movably receive the plunger, the barrel further including a base end including one or more lateral flanges and a tip end, the injector device comprising a first support defining a cavity surrounded by a peripheral edge into which the barrel of the syringe is perpendicularly insertable, wherein the base end of the barrel is supportable by the engagement between the peripheral edge of the first support and the one or more lateral flanges of the base end of the barrel, a second support movably coupled to the first support, the second support having a guide surface that abuttably engages the push flange of the plunger when engaged therewith, and at least two parallel guides movably coupling the second support to the first support.

Abstract: The present invention embodies a method and an injector adapted to incorporate this method, for keeping a patient's vein open during an intravenous contrast injector procedure without injecting a saline solution from a separate syringe. The injector includes a controller having a programable software module to allow an operator to configure the injector to push some contrast media fluid through an injection site and then retract a plunger drive ram. A syringe is adapted to allow a patient's blood pressure to move the syringe plunger back towards its starting position, thus enabling a patient's blood to pass through the injection site. Alternatively, the syringe is adapted with an elastic plunger which as it enlarges and contracts facilitates fluid communication through the injection site. Additionally, the plunger drive ram can be adapted to gradually pull as well as push the plunger, thereby causing fluid to flow across the injection site.

Abstract: A system for removing or tranferring a pharmaceutical product from a reservoir including an ampoule with a moveable piston therein and an adaptor which includes, generally along a longitudinal axis, a reservoir connector and an ampoule connector for coupling to the ampoule, wherein the ampoule connector includes at least one locking mechanism which, in a side wall, includes a resilient element generally corresponding to a portion of the side wall which extends along the periphery thereof and, at opposing ends, merges with the side wall.

Abstract: A holding device for locking the head of a syringe piston on a pusher has arms connected to respective pinions pivotable and translationally displaceable so that the corresponding arm is involved in the same motion between a rest position, in which the arms are closed and pressed against the pusher, and an open position, in which the arms are opened and remote therefrom, the translation is carried out prior to rotation during the movement toward the open position or in reverse order toward the rest position. The holding device also has a control member and means for converting a part of the control member movement by transmitting it to at least one pinion as a translation movement, which are translationally locked, and means for converting a part of the control member movement by transmitting it to at least one pinion as a rotation movement.

Abstract: Apparatus and methods of their use are described for engaging a pumping cartridge with a pump drive. In certain embodiments, the cartridge, comprising a cylinder and a movable piston assembly, is initially assembled or subsequently positioned so that the distance between the attachment point on the piston assembly for coupling to a drive assembly, and a reference point on the cylinder, is greater than the maximal distance that will be encountered during normal oscillation of the piston during use. The cartridge, in certain embodiments may be pressed into a drive assembly having means for immobilizing the cartridge and means for coupling the piston assembly to the driveshaft. In certain embodiments, when the cartridge is fully inserted into the drive assembly, the piston is pressed into the cylinder sufficiently to establish a selected distance so that the piston shaft is in the proper position to engage with a coupling mechanism carried on the driveshaft.

Abstract: A syringe assembly having passive disabling structure includes a barrel and a plunger rod assembly. The plunger rod assembly includes a plunger rod and a stopper connected by an indexing locking element. The number of strokes of the syringe plunger before the stopper is locked into the barrel rendering the syringe assembly unusable is determined by the number of detents on the plunger rod and stopper which engage the locking mechanism. Upon completion of the final delivery stroke, any attempt to withdraw the plunger rod from the barrel will cause the locking element to engage the barrel and trap the stopper in the barrel preventing further use of the syringe.

Abstract: A syringe assembly having passive disabling structure includes a barrel and a plunger rod assembly. The plunger rod assembly includes a plunger rod and a stopper connected by an indexing locking element. The number of strokes of the syringe plunger before the stopper is locked into the barrel rendering the syringe assembly unusable is determined by the number of detents on the plunger rod and stopper which engage the locking mechanism. Upon completion of the final delivery stroke, any attempt to withdraw the plunger rod from the barrel will cause the locking element to engage the barrel and trap the stopper in the barrel preventing further use of the syringe.

Abstract: A dual port syringe has an upper port for connection to a fluid reservoir and a lower port for delivery of the medical fluid under pressure to a patient. A first valve is connected between the fluid reservoir and the upper port, and second valve is connected between the lower port and the patient. During a fill operation, a piston is moved within the syringe to drawn fluid from the reservoir into the syringe through the upper port. During injection operation, the piston moves in an opposite direction to force fluid out of the syringe through the lower port.

Abstract: Apparatus and methods of their use are described for engaging a pumping cartridge with a pump drive. In certain embodiments, the cartridge, comprising a cylinder and a movable piston assembly, is initially assembled or subsequently positioned so that the distance between the attachment point on the piston assembly for coupling to a drive assembly, and a reference point on the cylinder, is greater than the maximal distance that will be encountered during normal oscillation of the piston during use. The cartridge, in certain embodiments may be pressed into a drive assembly having means for immobilizing the cartridge and means for coupling the piston assembly to the driveshaft. In certain embodiments, when the cartridge is fully inserted into the drive assembly, the piston is pressed into the cylinder sufficiently to establish a selected distance so that the piston shaft is in the proper position to engage with a coupling mechanism carried on the driveshaft.

Abstract: A syringe assembly having passive disabling structure includes a barrel and a plunger rod assembly. The plunger rod assembly includes a plunger rod and a stopper connected by an indexing locking element. The number of strokes of the syringe plunger before the stopper is locked into the barrel rendering the syringe assembly unusable is determined by the number of detents on the plunger rod and stopper which engage the locking mechanism. Upon completion of the final delivery stroke, any attempt to withdraw the plunger rod from the barrel will cause the locking element to engage the barrel and trap the stopper in the barrel preventing further use of the syringe.

Abstract: A syringe assembly having passive disabling structure includes a barrel and a plunger rod assembly. The plunger rod assembly includes a plunger rod and a stopper connected by an indexing locking element. The number of strokes of the syringe plunger before the stopper is locked into the barrel rendering the syringe assembly unusable is determined by the number of detents on the plunger rod and stopper which engage the locking mechanism. Upon completion of the final delivery stroke, any attempt to withdraw the plunger rod from the barrel will cause the locking element to engage the barrel and trap the stopper in the barrel preventing further use of the syringe.

Abstract: A mixing syringe having a first sealed chamber containing a powder (powder housing) and a second sealed chamber containing a liquid (liquid housing). When the user needs to inject a patient, he or she holds the mixing syringe approximately upright and depresses a plunger. This motion causes a piercer to pierce a foil seal separating the two chambers. The liquid then drops down into the powder housing. The liquid flows through a passage in a piston located in the powder housing, where it then comes in contact with the powder itself. As the user continues pressing the plunger downward, the piercer comes to rest within the piston and seals the passage through the piston, thereby locking the piercer and piston together. The device is then ready for an injection. As the plunger is further depressed the piston expels the powder and liquid mixture through a needle.

Abstract: A single-use syringe includes a barrel having front and rear passageways and a shoulder disposed there between, a plunger movable in the rear passageway, a carrier having a tail portion extending from a front end wall of the plunger, and pushing and retained regions formed forwardly of the tail portion, and a deformable sealing member in fluid-tight and slidable engagement with the barrel. The sealing member includes an inner surrounding wall surface with a yielding segment engaging the pushing region, and a retaining segment in frictional engagement with the retained region by a frictional force so as to confine a fluid-tight surrounding area. The frictional force is diminished when the yielding segment is depressed by the pushing region so as to facilitate release of the retained region from the retaining segment, thereby disrupting the fluid-tightness of the surrounding area and rendering the syringe unreusable.

Abstract: A plunger of a syringe includes a shank partially movably received in a barrel of the syringe. The shank includes a first end having a thumb rest radially extending therefrom and a second end having a stub longitudinally extending from the shank. The stub includes a stopper radially extending therefrom and a mushroom-shaped connector formed on a distal end of the stub. At least one annular flange radially extends from the stub between the stopper and the mushroom-shaped connector. A rubber bulb is securely longitudinally mounted to the stub, abuts the stopper and fully contains the at least one annular flange and the mushroom-shaped connector. The rubber bulb is previously formed and connected with the shank when inject molding the shank.

Abstract: A dual port syringe has an upper port for connection to a fluid reservoir and a lower port for delivery of the medical fluid under pressure to a patient. A first valve is connected between the fluid reservoir and the upper port, and second valve is connected between the lower port and the patient. During a fill operation, a piston is moved within the syringe to drawn fluid from the reservoir into the syringe through the upper port. During injection operation, the piston moves in an opposite direction to force fluid out of the syringe through the lower port.

Abstract: A device for the controlled delivery of an injectable liquid from a liquid container, wherein a flexible force transferring means transfers the drive force of a drive wheel onto a piston which can be slid axially in the device, a preferably permanently acting restoring force of a spiral spring is applied to the drive wheel in order to advance the piston and expel the liquid, and a locking means locks the drive wheel against rotation and releases the drive wheel to expel the liquid. In one embodiment, the amount of liquid expelled can be indicated by audible clicks and, in one embodiment, the drive wheel moves only incrementally when the locking mechanism releases the drive wheel.

Abstract: An animal fluid injector, replaceable syringe and method of replacement of the syringe in the injector are provided in which the syringe is loadable and unloadable into and from the injector through the open front end of a pressure jacket of the injector, thereby permitting replacement without retraction of the syringe plunger drive or disconnection of the injection tubing. The syringe is provided with a pressure restraining front end, such as an integral or removable cap with structure such as threads that lock the syringe to the front end of the jacket by mating with threads on the jacket. A mechanism in the injector, which includes, for example, a key on cam ring operated by a lever with one hand of an operator, interacts with structure such asymmetrically spaced notches on the back end of the syringe to, for example, rotate the syringe and simultaneously translate or rotate a coupling on the syringe plunger into and out of engagement with the plunger drive in the injector.

Abstract: A safety device for a syringe needle, which includes a guide and a slidable member having a first portion that is configured to be slid along the guide and a second portion having a formation for a needle, that facilitates the shielding of the sharp point within said formation. A non-reusable syringe, which includes a plunger having a first part with one or more followers and a second part housing a guide.

Abstract: A syringe, on which a needle member is mounted, includes a barrel, a plunger and a stopper. The barrel has a chamber, a stop portion adjacent to the needle member, a lock portion on a wall of the chamber and a needle mount. The plunger has a lock device and an operation portion for operation. A stopper has a stopper body to be squeezed into the chamber of the barrel for movement, a lock flange on the stopper body to be elastically deformed and to be locked with the lock portion of the barrel. The lock device is provided to the stopper body to be connected to the lock device of the plunger that connects the stopper to the plunger to move together. While the plunger is drawn, the lock device of the plunger or the stopper is broken and the stopper is restricted in the barrel.

Abstract: The present invention concerns a medication pump, a cartridge for use in a medication pump, a pump cap for use with a medication pump, components of the cartridge and methods of use of these devices. A cartridge includes a plunger having a tab that projects from an interior wall of the plunger. The tab can be used to lock the plunger into engagement with a drive rod of the pump. The drive rod defines a channel for receiving the tab of the plunger, where the channel includes an axial portion disposed parallel to an axis of the drive rod and a locking portion disposed in a circumferential direction around an outer surface of the drive rod. A similar channel structure can be provided on a removable fill rod used while filling the cartridge. The cartridge axially inserted into a cartridge chamber and then is rotated into engagement with the drive rod. The cartridge may also include axial guides at one end that interface with a guides on pump cap.

Abstract: A syringe adapter, which permits use of syringes of various types and sizes to be used with a front-loading injector, includes a piston extension and an adapter face plate. The piston extension includes structure for connecting the piston extension to a drive piston of the injector and a plunger of the syringe. The adapter face plate includes a mounting device for attaching the adapter face plate to an injector and a recess for receiving the distal flange of the syringe. The adapter face plate may also include locking pivot arms for releasably engaging the syringe flange.

Abstract: The invention provides a continuous liquid infusion device in which liquid syringe and a negative pressure cylinder are separable to use a liquid infused syringe. This continuous liquid infusion device includes: a negative pressure cylinder having a barrel part including an open/close valve at its tip and leg parts extending from a base end thereof; a piston air-tightly fitted in the barrel part and connected to a base end of an outer case covering an outer surface of the barrel part, through slots between the leg parts; a liquid syringe having a liquid infusion/discharge port at its tip, and a base end screwed with the outer case so that the liquid syringe is positioned back to back with the negative pressure cylinder; and a movable unit liquid-tightly fitted to an inner circumference of the tip of the liquid syringe and abutting against a base end of the leg parts.

Abstract: The present invention of a self-destructive syringe includes a hollow needle barrel having a detachable structure disposed between a rubber head and a push rod located therein; a retaining ring is disposed in a proper distance at the front end inside the needle barrel; after the injection, the rubber head of the syringe stays fixedly on the retaining ring; then the push rod is pulled backwardly to separate from the rubber head to form self-destruction; furthermore, connecting tabs are disposed on two opposite areas on a bearing base such that the rod body makes the connecting tabs break via rotation or pulling after the injection thereby causing the rod body to destruct more completely so as to prevent any danger of reusing the syringe.

Abstract: A self-venting movable seal and plunger assembly for use in dispensing materials from cylindrical bodies is disclosed. The assembly includes a self-venting movable seal and a plunger tip that seats within a plunger tip pocket in the movable seal, occluding a vent in the movable seal. Methods of using the assembly to dispense materials are also disclosed.

Abstract: An improved pump, reservoir and reservoir piston are provided for controlled delivery of fluids. A motor is operably coupled to a drive member, such as a drive screw, which is adapted to advance a plunger slide in response to operation of the motor. The plunger slide is removably coupled to the piston. The piston comprises a first member and a second member. The first member has an external proximate side and an external distal side. The external proximate side is adapted to contact the fluid and is made of a material having a first stiffness. The second member has a first side and a second side and is at least partially disposed within the first member. The first side of the second member is adjacent to the external proximate side of the first member and is made of a material having a stiffness which is greater than the first stiffness.

Abstract: A syringe with a snapping device for backward pulling the needle into the syringe after syringing includes a hollow barrel having an annular shoulder laterally extending from an inner periphery near a front end and two sector apertures defined in and extending through the annular shoulder. The snapping device is detachably secured in the front end of the hollow barrel and includes an annular flange laterally extending therefrom. Two snappers downward extend from the snapping device and engaged to the annular shoulder to longitudinally position the snapping device. A first connector is formed on the snapping device opposite to the hollow stub. A plunger is slidably and partially received in the hollow barrel. A second connector extends from the bulb and is selectively connected the first connector for turning and backward pulling the snapping device into the hollow barrel.

Abstract: A front-loading syringe, which comprises a movable plunger for injecting liquid contrast media, is mountable on a front wall of an injector housing having a pressure jacket, by a first quick release mechanism. At the same time, the plunger is connected to an injector drive mechanism by a second readily releasable mechanism. During the mounting operation, a sensor reads injection information from an indicator device on the syringe and feeds it to an injector control. An injection end of the syringe may include loop-shaped reinforcing handle portions.

Abstract: A system is provided which permits syringe barrels of prefilled disposable syringes to be filled and capped on standard vial filling equipment, and which permits the syringe body and piston comprising the barrel to be simultaneously sterilized by a sterilizing gas. The system provides means for stabilizing syringe barrels so they can be conveyed upright on their bases without tipping through vial filling and capping equipment. Preferably, the stabilizing means comprises a cylindrical sleeve into which the lower end of the syringe body is inserted, thereby stably supporting it against tipping. The system also provides means by which the piston is retained in close proximity to the lower end of the syringe body, but slightly separated therefrom to permit access to all surfaces of the piston by a sterilizing gas.

Abstract: An improved pump, reservoir and reservoir piston are provided for controlled delivery of fluids. A motor is operably coupled to a drive member, such as a drive screw, which is adapted to advance a plunger slide in response to operation of the motor. The plunger slide is removably coupled to the piston. The piston comprises a first member and a second member. The first member has an external proximate side and an external distal side. The external proximate side is adapted to contact the fluid and is made of a material having a first stiffness. The second member has a first side and a second side and is at least partially disposed within the first member. The first side of the second member is adjacent to the external proximate side of the first member and is made of a material having a stiffness which is greater than the first stiffness.

Abstract: A safety hypodermic syringe in which the plunger is detachably connected to the stopper by a hook joint so that when the user pulled the plunger backwards to carry the stopper and the needle assembly backwards to the inside of the barrel after the service of the syringe, the plunger is automatically disconnected from the stopper, leaving the stopper and the needle assembly inside the barrel.

Abstract: Adapters for use with an angiographic injector. A face plate adapter includes a channel for receiving a rearward end of a syringe. First and second mounting flanges on the adapter overlay a portion of the channel, to cooperate with mounting flanges on a rearward end of the syringe, so that the syringe mounting flanges may be inserted between the adapter mounting flanges, and then rotated in the channel behind the adapter mounting flanges, to thereby lock the syringe to the adapter. The adapter further includes one or more locking pins, which in a locked position extend across the channel, to block the syringe from rotating in the channel and thereby prevent a syringe from being dismounted from the adapter. A collar incorporated in the adapter interacts with a drive ram of the injector to move the locking pins into their locked position whenever the ram is forward of a rearwardmost position.

Abstract: A safety syringe comprises a barrel, which has a body forming a receiving hole, a stop portion in the receiving hole. A needle holder has a hole therein, an elastic lock piece formed a claw at distal end, and a dragged portion. The needle holder is received in the receiving hole of the barrel for the claw can lock with the stop portion of the barrel. A supporter, which is slidable received in the hole of the needle holder for supporting the elastic lock pieces to make the needle holder fixed secured in the barrel. And a plunger set has a bumper to move away said supporter and withdraw said needle holder.

Abstract: A injection system having a syringe body which defines a pumping chamber. A syringe plunger is located in the pumping chamber and is adapted for reciprocal motion within the pumping chamber. The syringe plunger includes a capture member projecting outwardly in a proximal direction. An actuating shaft is coupled to the syringe plunger and is movable through the syringe body to control movement of the syringe plunger. The capture member is adapted to flex radially outwardly when contacted by the actuating shaft to form a releasable engagement with the actuating shaft when the actuating shaft and the capture member are in an engagement position. A release actuator is disposed proximal to the syringe body, and the capture member releases the actuating shaft upon engagement with the release actuator.

Abstract: A safety syringe comprises a barrel having a projection in a rear end thereof, a needle holder for mount of a needle, the needle holder having a dragged portion, a stopper movable in the barrel, the stopper having a drag portion adapted for engaging into the dragged portion of the needle holder and a plunger connector, a plunger for moving the stopper in the barrel having a stopper connector engaged with the plunger connector of the stopper. When pulled backwards to the end after injection, the plunger connector of the stopper is forced onto the projection of the barrel and disengaged from the plunger, enabling the plunger to be removed from said barrel.

Abstract: A safety syringe 10 includes a generally tubular body 14 having a needle end 18 and plunger end 22, needle 38 and retractable needle seat 30, two-way valve 36, plunger 42, stopper 62, piston 52, and rear plunger seal 44. During use, the plunger may be moved to create a vacuum in the plunger. The user then moves the plunger toward the needle end, pressurizing a vial, then pulls backward to a selected position corresponding to the desired volume of fluid to be withdrawn. At the conclusion of the injection stroke, the piston is disengaged from the plunger. The vacuum within the plunger retracts the needle safely into the tubular body.

Abstract: A stabilizer for a piston that strengthens the piston when higher dispensing volumes and/or pressures are involved. The stabilizer intimately contacts the piston along the radius of the piston to prevent distortion of the piston thereby preventing the fluid being dispensed from flowing around the piston destroying repeatability, accuracy and contaminating the driving mechanisms. The stabilizer also prevents the piston from cocking that may make the dispensing inaccurate and non-repeatable. The stabilizer may be of substantially any material from metals to any of the plastics suitable for maintaining its structural integrity under the pressures and forces involved.

Abstract: A syringe structure includes a tube plug body embedded at an axle center of a rubber head at the front end of a push rod structure inside a hollow needle barrel; furthermore, a retaining ring is disposed in a corresponding area at the front end inside the hollow needle barrel. When the push rod pushes forwardly to a terminal end, the retaining ring retains a retaining lug at the front end of the tube plug body. When the push rod pulls backward reversely, the tube plug body immediately detaches from the rubber head thereby forming an air groove to make the syringe loose an vacuum air-tightness and unable to extract the medicine. Furthermore, a safety retaining tab and a retaining slot are disposed at the distal end of the push rod to provide a safety device before application so as to eliminate syringe self-destruction caused by any accidental pressing.

Abstract: The present invention of a self-destructive syringe includes a hollow needle barrel having a detachable structure disposed between a rubber head and a push rod located therein; a retaining ring is disposed in a proper distance at the front end inside the needle barrel; after the injection, the rubber head of the syringe stays fixedly on the retaining ring; then the push rod is pulled backwardly to separate from the rubber head to form self-destruction; furthermore, connecting tabs are disposed on two opposite areas on a bearing base such that the rod body makes the connecting tabs break via rotation or pulling after the injection thereby causing the rod body to destruct more completely so as to prevent any danger of reusing the syringe.

Abstract: A disposable syringe has a plunger rupture device and a washer-guide sealing barrel nozzle which make it safe against re-use, since the plunger breaks up and the piston is stuck at the bottom of the barrel, thereby making impossible reloading of the syringe. The syringe is assembled by fitting the pressure washer onto the plunger, fitting the rubber to the piston base, fitting the plunger to the piston, inserting the support bolt to the fitting of the set plunger/piston, fitting the assembled set plunger/piston into the barrel, and, finally, seating the screening washer inside the top of the barrel, thereby sealing the syringe entirely.

Abstract: An animal fluid injector, replaceable syringe and method of replacement of the syringe in the injector are provided in which the syringe is loadable and unloadable into and from the injector without retraction of the syringe plunger drive or disconnection of the injection tubing. A mechanism in the injector, which includes, for example, a key on cam ring operated by a lever with one hand of an operator, interacts with structure such asymmetrically spaced notches on the back end of the syringe to, for example, rotate the syringe and simultaneously translate or rotate a coupling on the syringe plunger into and out of engagement with jaws of the plunger drive in the injector.

Abstract: A single-use syringe has a barrel which can constitute a one-piece extrusion, and a shank which is reciprocably guided in the barrel and the distal end of which carries a plunger movable in the barrel toward and away from the needle-carrying front end portion of the barrel. The coupling between the plunger and the shank includes a set of circumferentially spaced-apart breakable spokes which can be of one piece with the distal end of the shank as well as with the plunger. The spokes break not later than when the shank completes a forward stroke during which the plunger expels a flowable substance, such as a medicine, from a chamber located in the barrel between the needle-carrying front end portion and the plunger. The plunger, the spokes and the shank can constitute a one-piece extrusion.