Abstract: An electrically-driven dental injector used in orally injecting such an injection liquid as an anesthetic in dental treatment. Electrically-driven dental injectors includes one having a mechanism for disengaging a pinion (82) from a rack (48) in order to retract a plunger rod (44) upon completion of injection; however, it has heretofore been necessary to manually operate the operating part from outside each time. The inventive electrically-driven dental injector is so arranged that the plunger rod can be manually pushed back directly oupon completion of injection without reqiring manual operation, and, to this end, the injector comprises a latch mechanism (84) for engaging/disengaging the ring gear (70) of a planetary reduction gear (50) with/from a casing (52), and an operating rod (94) extending through a support member (20) and functionally cooperating with the latch mechanism (84).

Abstract: The invention relates to a process for the monitoring of the pressure of a product fluid to be administered in dosed amounts during an infusion or injection, which is dispensable from a container that is received in or formed by a housing, by advancement of a piston received in the container. The reaction force exerted by the piston onto the housing, which serves as a measure for the fluid pressure, is hereby measured and fed to a control for a drive of the piston. The control compares the measured reaction force with a predetermined reference force and controls the drive of the motor under consideration of the result of the comparison. The reference force is a nominal value for the reaction force and a direct nominal/actual comparison is carried out between the measured reaction force and its nominal value. The invention further relates to an apparatus which is especially suited for carrying out the process.

Abstract: The invention concerns a device for administering an injectable product in doses, comprising:

Abstract: A method for holding an epidural needle together with a syringe and controlling the depth and advancement of penetration of the epidural needle during the epidural needle insertion into the human epidural space through the multiple layers of the tissues with the apparatus of the invention.

Abstract: An injection device is described which is lockable in its end position in such a manner that the reliability of storing or transporting it with a carpule attached is improved in comparison with devices according to the prior art. It is comprised of fewer components than comparable devices, with these components being easier to manufacture so that production costs are low. The injection device is used for medical purposes.

Abstract: A dose setting mechanism for a drug administration device and an injection syringe having such a dose setting mechanism are provided. The injection syringe has a housing accommodating an ampoule (3) containing medicine sufficient for a number of dosed injections, an injection press button (7), a piston rod (13) for co-operation with a piston in the ampoule (3) when injecting, and a dose setting mechanism comprising a rotatable dose setting element (5) interconnected with the press button. The dose setting mechanism further comprises a dose administration wheel (11) connected with the piston rod (13) and a coupling ring (12) connected with the dose setting element (5) and the press button (7).

Abstract: A fluid dispenser wherein a fixed threaded shaft carries a moveable microprocessor-controlled electric drive motor integrally provided with a shaft extension carrying a plunger for directly contacting and compressing fluid in a syringe barrel to dispense the fluid in accordance with programmed shot volume increments (as small as 0.

Abstract: A syringe for use with a powered injector includes an elongated body having an interior surface, a plunger movably mounted in the elongated body for pressurizing the fluid medium, and a plunger extension connected to the plunger and extending rearward from the plunger. The plunger extension includes at least one spine member operable to engage at least one engagement member on the interior surface of the elongated body. The at least one spine member and the at least one engagement member cooperate to prevent relative rotation between the plunger extension and the elongated body.

Abstract: A syringe for injection of doses of a medicine from an exchangeable cartridge has a housing comprising a cartridge holder and a dosing mechanism by which a dose is set and injected by successively advancing a piston rod to press a piston into the cartridge. The dosing mechanism comprises a threaded spindle and a nut member cooperating with the spindle. A dose is set by relative rotation of the spindle and nut member whereby the nut member is moved along the spindle. The position of the nut member on the spindle defines how far the piston rod is advanced. The spindle and the nut are locked against relative rotation when the dosing mechanism is not operated to set a dose. Access to the cartridge holder is obtained by opening a lid connected to the housing and coupled to the dosing mechanism in such a way that the locking of the nut element in its position on the spindle is released when the lid is opened, and the opening movement of the lid is transmitted to a piston rod retraction mechanism.

Abstract: The present invention provides a syringe and a powered injector for use therewith in which the syringe is attachable to a powered drive member of an injector over a range of relative axial positions of the syringe plunger and the drive member. The syringe comprises a plunger, and a plunger extension connected thereto and extending rearward from the plunger, such that the syringe may be operated manually or by a powered injector. In one embodiment, the plunger extension comprises a plurality of plunger attachment members located over a range of axial positions on the plunger extension. Each of the plurality of plunger attachment members is adapted to form a releasable attachment with at least one cooperating injector attachment member on the powered drive member.

Abstract: A veterinary syringe with a dosing device for administering medications in different preselectable amounts, comprises a piston rod which projects into a syringe cylinder by a piston provided at a first end of the piston rod and which is supported at a handle at its other end by an actuating lever which is fastened to the other end so as to be swivelable. The piston rod is supported so as to be displaceable longitudinally in a holder which is rigidly connected with the handle. A dosing device is provided between the holder on one side and the piston rod on the other side. At least two longitudinal grooves are arranged parallel to one another and which have different lengths compared with one another are distributed along the outer circumference of the piston rod. An engagement member is provided which is arranged so as to be rotatable about the piston rod and can be moved into one of the grooves.

Abstract: The invention provides a handheld, manually operable fluid applicator, particularly suited to the needs of surgeons, which can dispense multiple medically useful fluids, for example fibrin and thrombin components of a tissue adhesive, and which has a smooth feel and action. The applicator has a novel actuator mechanism providing a comparatively higher mechanical advantage in a commencement phase of the actuator stroke and a comparatively lower mechanical advantage in a completion phase of the actuator stroke.

Abstract: A piston rod for use in an injection device for an injection cartridge is provided with a single or multiple thread along a predetermined portion of its length, after which the thread changes into a longitudinal groove for each thread, such that a turning movement of the piston rod will turn into an axial movement after the predetermined length. The thread is shaped as one or more helicoidal grooves in the surface of the piston rod, the grooves turning into the longitudinal grooves after the predetermined length. A nut element cooperates with the thread and includes at least one radial inwardly directed projection for each thread, the projection or projections guiding the piston rod by the groove or grooves forming the thread.

Abstract: A fluid dispenser includes a hollow housing having an elongate chamber formed therein. A power supply is located within the chamber of the housing, the power supply being in electrical communication with a motor also located within the chamber of the housing. A switch, accessible from outside the housing, is in electrical communication with the power supply and motor for selectively operating the motor from a non-operable condition to an operable condition. A gear train is driven by a drive shaft of the motor, the gear train being located within the chamber of the housing and having a plurality of gears. At least one of the gears defines a slow speed gear which is rotatable at a relatively slow rate of speed and at least another of the gears defines a fast speed gear which is rotatable at a relatively fast rate of speed.

Abstract: A mechanism for use with a syringe to permit repeated injections of various doses has a body in which is slidably mounted a syringe piston operating rod. A plunger surrounds part of the rod and is slidably mounted in the body, a releasable screw-threaded connection being formed between the plunger and the body. An automatic one-way ball clutch interconnects the plunger and rod, and a further one-way ball clutch interconnects the body and the rod. A dose is dispensed by rotating the plunger to thread that plunger away from the further one-way clutch until a required dose is displayed through a window, the rod being held stationary by the further one-way clutch. Then, on driving the plunger forwardly, the automatic one-way ball clutch connects the plunger to the rod, so that the rod is also driven to project further from the body. Movement is limited by the forward end of the plunger by striking a cup member secured in the body.

Abstract: Disclosed is a closed system for the handling of injectable biological products and vaccines used in the treatment and prevention of livestock diseases. This system embodies a prefilled disposable cartridge (44) with disposable needle (48) attached and a metered pistolgrip syringe. The cartridge (44) is breech loaded into the syringe and the product is dispensed from the cartridge by a unique drag link (22) mechanism as a means for advancing the plunger rod (36) and forcing the vaccine from the cartridge (44) into the flesh of animal being treated. Each prefilled cartridge is disposed of after it is emptied and no cleaning is required. A color coding system between the prefilled cartridges 44 and the and the syringe bodies insure that proper dosages are given and that different products are not mixed up or confused with each other by the technicians dispensing the biological products.

Abstract: A piston rod device for use in an injection device for an injection cartridge is provided with a single or multiple thread (3) along a predetermined portion of its length, after which the thread (3) changes into a longitudinal groove (5) for each thread, such that a turning movement of the piston rod will turn into an axial movement after the predetermined length. The thread (3) is shaped as one or more helicoidal grooves in the surface of the piston rod (1), the grooves (3) turning into longitudinal grooves (5) after the predetermined length. A nut element (6) cooperates with the thread (3), and its device for cooperating consists of at least one radial inwardly directed projection (10) for each thread, the projection (10) or projections guiding the piston rod (1) by the groove or grooves forming the thread (3).

Abstract: An aspirator assembly enabled to remove fluids from a patient comprises an elongated hollow interior barrel, a plunger reciprocally movable within the barrel along the length thereof and extending outwardly from a rear end of the barrel. The plunger includes an elongated stem having a grip at an outer end thereof and a plunger head secured to an inner end of the stem. The plunger head is slidably engagable with an interior surface of the barrel. The improvement is found in a locking device which is selectively positionable into and out of a locked position. The locking device is formed in part on both the barrel and the stem and is adapted for removably locking the plunger head in a plurality of spaced apart locations within and along the length of the barrel. Additionally, the stem may be rotated so as to disengage the locking device and provide an aspirator with unobstructed reciprocation.

Abstract: A medication infusion pump is provided for controlled delivery of medication to a patient, wherein the pump includes a space-efficient flexible drive plunger for advancing a piston within a medication-containing syringe or cartridge for administration of the medication to a patient. The infusion pump comprises a compact housing defining a syringe chamber for receiving and supporting the barrel of a medication-containing syringe or cartridge having a nose end adapted for luer connection to catheter tubing through which the medication is delivered to the patient. An open rear end of the syringe barrel carries a piston which can be advanced in a controlled manner to dispense the medication. In the preferred form, the flexible drive plunger comprises a spring tape with a free end adapted for removable connection to the piston.

Abstract: The invention relates to a syringe (1) which comprises a rod (5) mounted for reciprocating movement in relation to a container (8), wherein one end of the rod has the form of a needle (3) or is able to coact with a needle. The syringe further comprises a piston (4) and coupling member (6) which connect and disconnect the piston to and from the rod. The coupling member assumes a connecting state when the piston is drawn by the rod from a position proximate to the needle to a position in which it is distanced therefrom, and are brought to a disconnecting or disconnected state when the piston is pressed by the rod towards the needle. The coupling member comprises support and/or slide surfaces (5k', 5k) arranged on that part of the rod which is proximal to the needle, and opposing support and/or slide surfaces (4k', 4k) on the piston.

Abstract: A releasably attachable manual dispensing aid is operable with a syringe having a syringe body and a syringe plunger that is movable within the syringe body. The dispensing aid includes a dispensing aid body that is releasably attachable to the syringe body. The dispensing aid further includes a dispensing aid plunger that is attachable to the syringe plunger, and has a slide that is slidable within the dispensing aid body. A fine adjustment, bottom stop, Chaney stop, and/or drag brake for the slide are optionally provided. An electronic linear position measuring device has a first portion fixed to the dispensing aid body and a second portion fixed to the dispensing aid plunger. Optionally, the dispensing aid includes a microprocessor that receives as inputs a calibration value for a particular syringe and the position signal, and determines as an output signal the true volume of liquid displaced by the syringe plunger movement.

Abstract: The present invention relates to a syringe for delivering only a single dose of a medicament at each actuation of the syringe. The device includes a cylinder which is adapted to contain the medicament, the cylinder having a piston which is journalled in the bore of the cylinder for axial movement in the bore towards an outlet. The piston can be moved axially within the bore of the cylinder by means of a plunger member which carries one or more drive teeth which are adapted to engage teeth carried by an axially moveable drive member. The axial spacing between the axially adjacent teeth on either the plunger member or the drive member corresponds to the forward axial movement of the plunger member which is required to discharge a single dose of medicament. The drive member can also be retracted axially only a predetermined distance which corresponds to one of the tooth spacings with respect to the plunger.

Abstract: A safety injection device, such as a hypodermic needle, for dispensing liquid from a cartridge in quantities determined by the length of a plunger which may be selectively adjusted in one position only of the plunger. The plunger comprises first and second threadedly connected sections cooperating with a connector which may be selectively activated when the plunger is moved into the one position to permit rotation of one plunger section relative to the other. Preferably, the adjustment position of the plunger coincides with its positions assumed in preparation of an injection stroke, with the connector preferably providing for undirectional rotation of the one plunger section.

Abstract: A syringe system for delivering fluid with a volume displacement assembly intensifier for expelling a predetermined volume of fluid from the syringe while activated. A syringe having a barrel and a syringe plunger is selectively operable to deliver fluid from the syringe barrel, and the volume displacement assembly is mounted in fluid communication with the barrel of the syringe. When the volume displacement assembly is activated, a predetermined amount of volume is displaced from the syringe into the balloon of a balloon catheter. Deactivation results in balloon deflation. A predetermined degree of inflation may be reproducibly obtained without the exercise of deliberate care as required with conventional syringes lacking a volume displacement assembly.

Abstract: A blood coagulation test system for in vitro assessment of blood characteristics including hemostasis, thrombus formation, thrombolysis, and collagen platelet interaction includes a syringe/test cartridge for collection, testing and disposal of the sample together with a test analyser for executing the test protocol. Coagulation functions are evaluated by establishing controlled bleeding of the sample from a capillary tube within the cartridge and monitoring these blood characteristics as a function of blood pressure variations occurring in the cartridge as the test proceeds. The blood sample remains within the cartridge for testing and after disposal.

Abstract: An inflator for use with a catheter having an inflatable component wherein the inflator includes a housing having an elongated plunger passage and an elongated gage passage. The housing includes a one piece main body which defines at least major lengths of both of the passages, and the passages extend in generally side- by-side relationship. The housing has a port which communicates with both of the passages and which can be coupled to the inflatable component of the catheter. A plunger is movable longitudinally in the plunger passage and is extendible out of a plunger opening in the plunger passage. A pressure responsive gage member is movable longitudinally in the gage passage and is responsive to pressure of the fluid adjacent the port. An indicator is responsive to the longitudinal position of the gage member to provide an indication of the pressure of the liquid adjacent the port. A releasable lock carried by the housing limits the plunger movement.

Abstract: A medication dispensing apparatus comprising a liquid container having an open end and a cap assembly engagably removable from the open end of the container. The cap assembly comprises an external cap having a lower end, an inner fixing element adapted to be fitted into the open end of the liquid container and connected to the lower end of the external cap. The cap assembly further comprises a dropper connected through the inner fixing element and having a fluid passageway and activation element for aspirating liquid from the container into the dropper.

Abstract: A rotational pressure drive for filling a medical syringe with a fluid and obtaining, maintaining, and releasing a desired fluid pressure within the syringe. The commercially available medical syringe includes a barrel with a plunger extending therein. Extending laterally and radially about the proximal end of the syringe barrel are several flanges. The rotational pressure drive comprises a hollow cylindrical chamber with a partially closed, proximal end with an opening therethrough. The drive further includes an axial extension member extending through the opening in the partially closed end for engaging and urging the proximal end of the syringe plunger toward the partially closed, proximal end. The drive, in another aspect, includes a syringe plunger having a distal and a proximal portion. The distal portion is inserted into the syringe barrel with the proximal portion extending through the opening of the partially closed, proximal portion of the drive.

Abstract: An inflation device is disclosed for inflation of a balloon of a balloon catheter. A housing defines a fluid-receiving reservoir in fluid communication with the balloon and an interior space for completely receiving a pressure gauge which accesses the fluid for measurement of the pressure within the system.The reservoir has a piston and threaded plunger extending from a proximal opening in the reservoir. The threaded plunger is selectively engaged by a biased rotatable arm on the housing. The piston and plunger are part of a syringe received within the reservoir, and the housing defines an aperture for visual readout of the level of liquid in the reservoir.The pressure gauge contains a Bourdon tube and further contains a gauge fluid in communication with the tube.

Abstract: A device for the transnasal or oral administration of drugs or similar media, comprising a finger-like applicator (3) which has a spray nozzle (6) disposed at its free end and includes a cylinder unit (1) for accommodating the medium to be administered. The medium is applied by moving a piston (7) into the cylinder unit (1). A membrane-like seal (4) is located between the cylinder unit and spray nozzle and is slotted to open and form a fluid passage under pressure. The cylinder unit may be built into the applicator or may include a separate cartridge releasably mounted in the applicator. The piston may be activated in steps or in a continuous motion. A second applicator may be attached to the side of the first applicator with the spray nozzles located generally in accordance with spacing of human nose nostrils.

Abstract: An inflation system for pressurization and depressurization of a balloon catheter. The inflation system includes a syringe, including a syringe barrel, a plunger with expandable thread, a handle with cam, a syringe end cap, pressure gauge, flexible tubing, and connectors. The syringe is structured such that part of the syringe barrel has an internal thread which engages the expandable threads of the plunger. In the disengaged mode, the plunger slides freely within the syringe barrel allowing for rapid motion to purge, pressurize, or depressurize the inflation system. Once pressure reaches a predetermined level in the system, the cam on the handle causes the threads to automatically lock against the syringe barrel, and continued pressurization or depressurization is accomplished by the rotation of the plunger handle with respect to the syringe barrel. One advantage of the inflation system is that only one step is necessary for locking the syringe for controlled pressurization and depressurization.

Abstract: A locking syringe selectively operable in either of a freely reciprocating or a restricted, threaded mode. A trigger attached to the plunger includes internal threads on the interior of the barrel of the syringe and external threads located on the plunger on a spine slidable in a longitudinal slot in the plunger. A handle is affixed to the plunger, and a retraction bar is rigidly secured to the spine. The threads on the plunger may be retracted from engagement with the threads on the barrel, thereby placing the syringe in its freely reciprocating mode. The trigger, which is spring biased to engage the external and internal threads, employs a plurality of ramps and channels disposed at approximately the same angle to the longitudinal axes of the plunger and barrel as are the threads. A pawl is pivotally securable on the retraction bar at a position receivable into a pawl receiving aperture on the handle when the receiving bar is in its first position permitting reciprocating movement of the plunger.

Abstract: A rotational pressure drive for a medical syringe to obtain, maintain, and release a desired fluid pressure within the syringe. The commercially available medical syringe includes a barrel with a plunger extending therein. Extending laterally and radially about the proximal end of the syringe barrel are several flanges. The rotational pressure drive comprises a hollow cylindrical chamber with a closed end for engaging the proximal end of the syringe plunger, and a hollow passageway extending therethrough to an open end which receives the plunger. Positioned circumferentially and longitudinally along the chamber are pluralities of internal threads with individual starts for engaging the radially extending flanges of the syringe barrel. The extended plunger is inserted into the passageway of the drive to the closed end, whereas the flanges of the syringe barrel are rotationally engaged with the starts of the internal thread pluralities for advancement into the passageway of the drive.

Abstract: An angioplasty syringe has a half-threaded surface which engages a threaded hydraulic plunger for generating balloon inflating pressure. The threaded nut is part of a component having a cam which engages a cam is part of a pistol trigger. The cam positively raises and closes the threaded surface depending upon the trigger position.

Abstract: A generally pen-like syringe incorporates a dose metering device provided by a cap 7 rotatable with respect to a pen body 8 to a position related to the dose of medicament (for example insulin) to be injected. The rotation compresses a coil spring 6, which is prevented from unwinding by cooperating ratchet teeth. When the dose is to be injected, a trigger slide 42 is moved to the left causing the ratchet teeth to come out of engagement. This permits the spring 6 to unwind, thereby rotating a drive sleeve 1, drive gear 3 and a drive plunger 2. The drive plunger 2 is formed with a quick pitch screw thread so that its rotational movement is accompanied by axial movement to cause medicament to be discharged from a cartridge and injected through a needle.

Abstract: A central housing includes a coaxially reciprocatable screw member operative through a selectively actuated drive motor to effect reciprocation of the screw within the housing. The screw member includes a piston mounted at a forward distal end thereof mounting a flexible bag therewithin, wherein the bag directs suction from a forwardly coaxially mounted nozzle into the bag.

Abstract: A syringe and method for use which may be selectively operated between a free position and a locked position. A triggering device configured with a trigger attached to the plunger of the syringe is employed. The triggering device includes a set of threads located on the plunger and a corresponding set of threads on the barrel of the syringe. Upon actuation of the trigger, the threads on the plunger are retracted from their position of engagement with the threads on the barrel, thereby placing the syringe in position for free movement of the plunger with respect to the barrel. The threads are biased in the engaged position. Thus, when the trigger is released, the threads on the plunger return to their position of engagement with the threads on the barrel. In the locked position, the plunger may be screwed into or out of the barrel by rotating the plunger, enabling the operator of the syringe to maintain strict control over the amount of pressure in the syringe.

Abstract: A syringe and method for use which may be selectively operated between a freely reciprocating position and a restricted position. A triggering means configured with a trigger attached to the plunger of the syringe is employed. The triggering means includes threads located external of the plunger and corresponding threads internal of the barrel of the syringe. Upon actuation of the trigger, the threads on the plunger are retracted from their position of engagement with the threads on the barrel, thereby placing the syringe in position for free sliding movement of the plunger with respect to the barrel. The trigger is biased to the engaged position so that if the trigger is released, the threads on the plunger return to their position of engagement with the threads on the barrel. In the restricted position, the plunger may be screwed into or out of the barrel by rotating the plunger, enabling the operator of the syringe to maintain strict control over the amount of pressure in the syringe.

Abstract: Apparatus for introducing fluids into, and withdrawing fluids from, a hollow organ of the body, in particular a galibladder, for conducting litholysis, comprises a piston-type injection device having a multi-directional valve and which can be removably inserted into an operating mechanism. The injection device has a chamber located in front of its piston and serving as a settling chamber for a mixture of organ secretion and stone sludge removed with the solvent from the hollow organ. The valve is for the sequential connection of the pressure chamber to the hollow organ, to a tank for the solvent, and to a receiving vessel for fluid drawn off.

Abstract: A method and apparatus for controllably dispensing a fluid substance on a repetitive, variable basis utilize a piston-cylinder type handheld finger operated dispenser. The dispenser includes a generally cylindrical body for containing a supply of the fluid substance to be dispensed, a formed tip through which the fluid substance may be dispensed, a piston and a piston rod for use in dispensing the fluid substance from the cylinder and a formed gouge or actuator for initiating movement of the piston rod to dispense the fluid substance in amounts controlled by the skill and desire of the user. The actuator is formed from a harder material than the material used to form the piston rod so that gouges or teeth are formed by the actuator during usage along the length of the piston rod, the spacing between adjacent teeth being variably selected by the user. A specific application of the dispenser is for use in dispensing topical dental medicine by a user in his own oral cavity.

Abstract: Disclosed is a syringe pump apparatus adapted to have a syringe mounted thereon so as to supply in a specified amount per specified unit of time an aqueous solution such as medication within the syringe. A first shaft is fixed to a slider for causing a piston portion of the syringe to operate. Between this slider and a drive motor there are provided a block and a second shaft, the block being provided with an overload detecting mechanism. When the movement of the slider is forcedly stopped during a time period in which the slider is being moved through driving of the drive motor, the resulting load is transmitted to the first shaft in response to the forced stoppage of the slider. In accordance with this load, the overload detecting mechanism detects the state of overload of the slider. Then, when the value detected has exceeded a specified value, the drive motor is stopped by a drive halting mechanism.

Abstract: A dual-chamber cylinder ampoule is used for the mixture of a sensitive, solid medicament, with liquid which is caused to flow calmly through the medicament in order to avoid any shaking and mechanical influence. The mixing is preferably carried out at a pressure above atmospheric.An injection device for the preparation of an injection solution and a following injection of such solution includes first and second tubular members for enclosing and holding a dual-chamber cylinder ampoule, in which the dry medicament is kept separated from the liquid. When the two tubular members are being screwed together the liquid is calmly and gently mixed with the dry medicament and dissolves it, and the resulted solution can thereafter be injected by means of the dosage and administration mechanism, provided in one tubular member, through a needle arranged at the front end of the other tubular member.

Abstract: This invention relates to an automatic drip infusion set which is applicable for use in a situation of low atmospheric pressure, not to be suspended from a higher place during application, and which can provide alarm signal accordingly. The device includes a motor to drive an extension rack assembly by means of a speed variator so as to let the push plate which is connected with the rack assembly at the front end compress a compressible drip bottle to infuse the solution contained therein into patient's body smoothly. During moving of the rack assembly, it will trigger a buzzer and a stop control switch respectively so as to stop infusion process and give an audio alarm signal when the solution of the drip bottle is about exhausted.

Abstract: Apparatus for the delivery of light-curable composite dental filling material comprises a tubular composite reservoir, plunger and slider. The slider is free to move longitudinally along the reservoir but is matingly mounted to facets on the outside surface of the reservoir to prevent angular movement of the slider relative to the reservoir. The plunger consists of a shaft threaded to mate with the threaded inside diameter of the composite reservoir. The plunger also has a disk integrally formed to end of the shaft at one end and a male front piece at the other. The male front piece mates with a female fitting of a separate composite extrusion element.

Abstract: A dosing syringe has a cylindrical syringe body which at its tapering end has a dispensing orifice and at its other end a stepped cylindrical enlargement with two opposing handles. A recess is located below each handle, and a piston is inserted into the cylindrical syringe body. The piston is in contact with a dosing plunger having an external thread. Two threaded sides are arranged around the plunger and each threaded side has a positioning projection introduced into the recesses of the enlargement. According to the invention, the piston is connected to the dosing plunger by a spring retainer connection and the threaded sides have an outside groove in which an O-ring is inserted in countersunk fashion to hold the two threaded sides together. As a result, the piston-dosing unit can be prefabricated and introduced as a complete unit including the threaded sides into the enlargement of the syringe body where it is fixed simplifying the production technology of the dosing syringe.

Abstract: An instrument of artificial insemination or embryo transfer by a transperitoneal and/or cervical route or for sampling follicular liquids in mammals especially horses, pigs, sheep, goats, deer and carnivores is of the type constituted by a syringe formed by a sheath in which slides in fluid-tight manner a piston movable in translation. The sheath is externally protected by a rigid cover and is immobilized in a manipulator sleeve comprising a rotary member adapted to actuate the piston. The anterior end of the sheath is fitted with a needle. The cover protecting the sheath is covered by and guides a palpator the length of which is greater than that of the cover but less than that of the sheath (including the needle). Thus the needle of the syringe is selectively covered or exposed in whole or in part by axial sliding movement of the cover.

Abstract: A syringe having a cylinder and a piston longitudinally and rotationably movable in the cylinder. First and second sets of one-way ratchet shoulders and ratchet keys are provided between the cylinder and the piston in which the first set of shoulders and key, when engaged, allow movement of the piston in one longitudinal direction but prevent movement in the opposite second direction. The second set of shoulders and key, when engaged, allow movement of the piston in the second direction but prevent movement in the first direction. A rotational control between the piston and the cylinder provides for sequentially disengaging and engaging the first and second sets of ratchet shoulders and keys upon rotation of the piston relative to the cylinder for operating the syringe for a single cycle.

Abstract: A syringe is provided with a helical spring, which furnishes an upper limit to a pressure employed via a plunger to move a fluid or paste through an opening in a syringe. The plunger is maintained in a low compressing state versus the fluid with the helical spring. A toothed rack is attached to the plunger. The toothed rack is engaged by a ratchet forming part of a lever. The lever is hinged on an axially movable assembly. Actuation of the lever drives the ratchet and therewith toothed rack and plunger forward against the force of the spring. As more force is applied to the plunger the resilient force of the compression spring allows the axially movable assembly to move backward and thus to limit the pressure exerted by the plunger on the fluid. A second ratchet can be provided for preventing a backward motion of the toothed rack while the lever seeks a new point of engagement for the ratchet with the toothed rack.

Abstract: A dispenser for liquids including a cartridge containing a liquid, a nozzle, and a hollow flexible bladder between the cartridge and the nozzle. An assembly can be manually rotated to provide a high mechanical advantage and incrementally drive a piston through the cartridge to thereby fill the bladder with liquid from the cartridge and discharge any plug of solidified material (e.g., diluted phosphoric acid) that may be present in the nozzle; and manually operated button can be pressed to quickly and controllably collapse the bladder to thereafter dispel liquid within the bladder through the nozzle.

Abstract: A syringe assembly having a cylinder adapted to receive a hypodermic needle at one end thereof and a piston reciprocably movably disposed in the cylinder. The exterior of the piston is at least partially threaded and it includes a longitudinal, exterior groove extending over the length of the thread. The cylinder includes a piston thread engaging section which is integrally constructed, e.g. molded with the cylinder, and hingeable relative to the cylinder so that the thread engaging section can be moved through a cutout in the cylinder into engagement with the piston thread. The cylinder has an integrally constructed collar at its open end and forms a detent that can be resiliently biased against the piston so that upon rotation of the piston about its axis the detent engages the longitudinal groove and thereby generates a signal each time the detent engages the groove, i.e. each time the piston is rotated through a predetermined arc and dispenses a predetermined, measured amount of liquid.