Abstract: Radiation curable coatings and methods of utilizing the coatings are provided. In a general embodiment, the present disclosure provides a coating composition containing about 15% to about 80% by weight of one or more radiation curable compounds such as polycarbonate acrylate oligomers, polyurethane acrylate oligomer, polyester acrylate oligomers, silicone-based acrylate oligomers, or a combination thereof, and about 10% to about 80% by weight of one or more acrylate monomers.

Abstract: Methods and devices for hypodermic implanting micro-transponders into a body. The method includes preassembling an array of micro-transponders into a cannula which is configured for tissue penetration and injection.

Abstract: The invention relates to improved equipment for the administrations of epidural anaesthetic and to novel methods of administration using the same. Improvements include a needle configured for reduced incidence of post dural puncture headaches, an improved sensitivity loss of resistance syringe and a novel cannula which in one form readily facilitates combined spinal epidural anaesthesia (CSE). Also includes is a catheter having a pre-assembled injection hub and connection means to optionally retain a cannula that is withdrawn over the catheter.

Abstract: A piston stopper (2) made substantially of rubber has a piston section (8) enclosed in cap-like manner by an inert film (9?) facing the contents of a syringe or carpule cylinder (1), the inert film (9?) being located adjacent to the syringe or carpule cylinder (1). Adjacent to the piston section (8), the piston stopper (2) has a non-coated sealing section (10). According to a device and method for producing one such piston stopper (2), a non-vulcanized rubber sheet (7) is inserted into a form tool, together with an inert film (9). Under the effect of pressure and heat, an entire piston stopper contour is formed from the layered arrangement, extending to a flange (16) which protrudes laterally beyond the piston stopper (2) in the region of the separating plane of the form tool. A receiving cavity (6) for a piston rod is created in the piston section (8). The wall area of the sealing section (10) surrounding the receiving cavity (6) is forced into the receiving cavity (6).

Abstract: A floating element for separating components of a physiological fluid comprises two parts that are relatively movable. The two parts define a prescribed volume between them when at their maximum separation, and one of the parts may be moved toward the other to express the fluid contained in the volume between the parts. The parts are made of materials having densities so that they assume a desired position in the fluid to allow selected components to be easily obtained and expressed.

Abstract: An I.V. flush syringe assembly includes a barrel having an inside surface defining a chamber for retaining fluid, an open proximal end and a distal end including a distal wall with an elongate tip extending distally therefrom having a passageway therethrough in fluid communication with the chamber. A plunger having an elongate body portion and a stopper slidably positioned in fluid-tight engagement with the inside surface of the barrel is provided. Anti-reflux structure in said barrel is provided for controlling stopper deflection when fluid has been delivered from the chamber and the stopper is in contact with structure on the distal wall.

Abstract: A medication dispensing apparatus with a spring-driven locking feature includes a drive member movable in a distal direction within a housing, and a fluid container with a piston that is advanceable by the drive member (60) when such drive member is moved distally by a driving means. The apparatus includes a latching element (180) having a skid (190) that is slidable along a surface of the drive member as the drive member passes distally during advancement. The drive member is arranged with the skid so as to maintain a latching lip of the latching element against a spring force in a first position free of the driving means during dose preparing and injecting prior to a final dose administration.

Abstract: Apparatus is described for administering a substance to a subject. A vial contains the substance and a stopper is disposed within the vial and is slidably coupled to the vial. A first threaded element is (a) rotatable with respect to the vial and (b) substantially immobile proximally with respect to the vial during rotation of the first threaded element. A second threaded element is threadedly coupled to the first threaded element. At least a distal end of the second threaded element is substantially non-rotatable with respect to the vial, and the distal end of the second threaded element defines a coupling portion that couples the second threaded element to the stopper. The first threaded element, by rotating, linearly advances the stopper and at least the distal end of the second threaded element toward a distal end of the vial. Other embodiments are also described.

Abstract: Apparatus is described for administering a substance to a subject. A vial contains the substance, an inner surface of the vial being shaped to define a protrusion therefrom. A stopper within the vial is slidably coupled to the vial. A first threaded element is (a) rotatable and (b) substantially immobile proximally with respect to the vial during rotation of the first threaded element. A second threaded element is threadedly coupled to the first threaded element. The protrusion impedes rotation of the second threaded element with respect to the vial. The distal end of the second threaded element remains proximal to a distal end of the stopper during rotation of the first threaded element. The first threaded element, by rotating, linearly advances the stopper and the second threaded element toward a distal end of the vial. Other embodiments are also described.

Abstract: A syringe cylinder comprising an interior space, having a stopper that can be displaced in the interior space and delimits an active ingredient space, is proposed. The syringe cylinder is characterized by an indicator device biuniquely indicating a longitudinal movement of the stopper occurring in one direction.

Abstract: The present invention relates to a device (1) for injection of a product, comprising: a body (2) receiving a hollow injection needle (4) and a container (10) containing the product to be injected; means (5 to 7; 28, 29) for holding the needle in position, means (39, 41, 45) for holding the container (10) in position,; and a piston (11) engaged in the container (10), characterized in that it additionally comprises: first actuating means (42) of means (5 à 7; 28, 29) for holding the needle (4) in position, second actuating means (32) of means (39, 41, 45) for holding the container (10) in position, said first and second actuating means (42, 32) making it possible, at the end of the injection, to respectively release the means (5 à 7; 28, 29) for holding the needle (4) in position before, or simultameously to, the release of the means (39, 41, 45) for holding the container (10) in position, a container support (9) which is mounted slidably on the body (2) and is displaceable relative to the latter in order

Abstract: A single use retractable syringe and plunger are provided. The syringe has a barrel having a collar with one or two projections that slidably engage a plurality of interconnected slots of the plunger. The slots of the syringe include one or more gates or abutments that restrict slidable movement of the projections within the slots to thereby prevent re-use of the syringe after injection and subsequent retraction of the needle.

Abstract: Devices, tools and methods for minimally invasive implantation and distraction between spinous processes for treatment of spinous disorders. An interspinous implant device for distracting at least one pair of adjacent spinous processes includes a main body including a shaft having a longitudinal axis; and first and second arms extending transversely from the main body, wherein at least one of the first and second arms is slidably mounted with respect to the shaft. The arms are configured and dimensioned to extend laterally from both sides of the spinous processes when implanted therebetween and to be inserted between the spinous processes laterally from a single side thereof. The arms are variably positionable between a closed configuration, to facilitate insertion of the arms between the adjacent spinous processes, and an open configuration, in which the arms are separated from one another.

Abstract: A dispenser assembly for liquid products is disclosed. Such an assembly may include an elongated barrel, and an elongated plunger having a flexible sealing lip disposed at an end thereof. The sealing lip may have an outer diameter in a relaxed state that is greater than an internal cross-sectional diameter of the barrel. When the plunger and barrel are actuated axially relative to one another, the sealing lip flexes inwardly and provides the sole contact between the plunger and the barrel.

Abstract: An improved medical device for injecting a local anesthetic into an organism. The device comprises a needle, an injection tube attached to the posterior end of the needle, a plunger attached to the posterior end of the needle, a housing dimensioned so that the plunger slides through the housing with friction, and a conduit dimensioned to allow the needle to pass through. The device allows an anesthesia provider to perform a nerve block more safely and efficiently. In one embodiment of the device, the nerve block can be performed without an assistant.

Abstract: Provided, among other things, is a therapeutic dispensing device (100) comprising: a handle (10) with proximal (44) and distal (46) end, defining cavity (11), and containing a window at the distal end (13); a channel (38) positioned within the cavity; a carriage (12) supported by the handle and configured to slide into the handle through the opening, and at least partially into the channel, the carriage having proximal end (2) and distal end (4), the proximal end having a first opening (8) and the distal end having a substantially non flexible engagement surface and a second opening (6); a syringe assembly (14) supported by the carriage and at least partially positioned in the channel, such assembly comprising a barrel (20) supporting plunger (16), and needle (24) for dispensing contents of the barrel; and a spring means (40) operably biased between the carriage and the handle.

Abstract: A safety syringe assembly includes an elongated, generally cylindrical barrel having a hollow interior forming a hollow nozzle located at a distal end of the barrel and opening into the interior of the barrel. A plunger is slidably mounted in the barrel and has a longitudinal open channel. A needle holder mounts a needle at a distal end thereof and is slidably mounted in the longitudinal open channel of the plunger for movement between an advanced position in which the needle on the distal end of the needle holder projects from a distal end of the nozzle, and a retracted position in which the needle is retracted within the barrel. A compression spring is mounted inside of the barrel, and a spring retainer element has a spring support portion extending from the interiorly of the barrel to a portion for mounted within the barrel and supporting a distal end portion of the spring against expansion. The spring urges the needle holder toward its retracted position.

Abstract: The invention relates to a device (10) for injecting an injectable product, comprising a reservoir (12), which holds the product, a discharge assembly (14) for discharging the product out of the reservoir (12), and an actuating device (16) for subjecting the product inside the reservoir (12) to a pressure. The invention provides that the device (10) can be used as a single-use syringe or as an ampoule for a needleless injector.

Abstract: A system for treating tissue includes a cannula having a proximal end, a distal end, and a lumen extending between the proximal and the distal ends, and an array of delivery tubes at least partially disposed within the lumen, each of the delivery tube having a lumen, wherein each of the delivery tubes is slidable relative to the cannula, and has a first configuration when inside the lumen, and a second configuration when outside the lumen. A system for treating tissue includes a treatment device having a distal end, and an indexing device for controlling a longitudinal position of the distal end of the treatment device relative to a target tissue region, the indexing device having a tubular portion for receiving the treatment device.

Abstract: An injection device is described. A syringe 114 is received within a housing, the syringe having a bore terminating at a forward end in a hypodermic needle 118 and at a rearward end in a flared opening 210 in which a bung 134a having a bore 206 surrounded by a skirt 208 is inserted. A drive element 134 has a forward end consisting of a substantially flat annular region 200 that bears upon the skirt 208 of the bung 134a and surrounds a conical middle region 202 that is received in the bore 206 of the bung 134a. An actuator advances the drive element 134 so as to advance the bung 134a and discharge the contents of the syringe through the needle 118. The opening 210 in the rear of the glass syringe is flared by being provided with a radius. The combination of the radius at the opening 210 and the projecting conical middle region 202 of the drive element allows misalignments of the two to be managed during automated assembly.

Abstract: The present invention provides a syringe device including a needle, a syringe body, and a syringe adaptor between the needle and the syringe body. This syringe adaptor includes a reservoir and a plunger configured to move into and out of the reservoir in a direction perpendicular to the longitudinal direction of the needle. The position and direction of travel of the plunger in the syringe adaptor allows a user of the syringe of the present invention to safely and accurately operate the syringe with one hand.

Abstract: A system for facilitating preparation of medication doses comprising a container of for receiving a quantity of medication, the container having color bands extending circumferentially therearound to facilitate preparing medication doses, each color band corresponding to a predetermined dosage of medication.

Abstract: An apparatus for injecting a material comprising an injector barrel in communication with a delivery needle and a plunger, wherein at least a portion of the plunger is slidably disposed within a proximal portion of the injector barrel, and a proximal end of the delivery needle is in communication with a distal end of the injector barrel, and a thermal jacket surrounding at least a portion of the length of the injector barrel is disclosed. The thermal jacket may be used to regulate the temperature of the material to be delivered.

Abstract: A single-use system for separating blood and producing platelet concentrates includes an elongated container for receiving blood from a patient. The container has a movable plunger mounted within the blood container for expressing blood fractions separated during centrifugation of the container through a first port mounted at one end of said container, a second port mounted on the plunger, and a third port mounted on a plunger rod attached to the plunger.

Abstract: An injection channel is produced in human or animal tissue by means of a pre-injection device for incorporating a medium which is to be injected. Said pre-injection device comprises a chamber which is used to receive a pre-injection medium, a nozzle which is provided for attachment to the skin and a pressure generating device which acts on the chamber in order to generate a high-pressure jet from the pre-injection medium exiting from the nozzle. Said type of needle-free pre-injection device is serially connected to a main injection device.

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: Embodiments of surgical markers for marking internal and external tissues are provided herein. In some embodiments, a surgical marking device for marking tissue may include a body including an at least partially hollow interior, a first end and a second end; a tip coupled to the body at the second end; and a plunger movably coupled to the body at the first end and configured to control a pressure within the at least partially hollow interior of the body via movement of the plunger relative to the body, wherein the pressure control may control a flow of ink outward of the body via the tip during use. Alternatively, in some embodiments, a squeezable bulb may be provided in place of the plunger, the squeezable bulb having an interior volume fluidly coupled to the body, wherein a pressure within the body may be controlled via the squeezable bulb.

Abstract: A pharmaceutical delivery apparatus including a housing (22), a syringe assembly, and a needle (44) cap. The syringe assembly is plungeable relative to the housing from a first position, at which its needle tip is disposed within the housing, to a second position, at which its needle tip projects from the housing beyond the proximal end for insertion into an injection site. A base (46) of the needle cap is exposed at the housing proximal end to be manually grippable for cap removal. A needle cap stem is upstanding from the base and sized and configured to insert through an opening is the housing proximal end to cover the needle tip when the syringe assembly is disposed in the first position. The needle cap base further includes a plurality of distally projecting cams (54, 258) located radially outward of the stem. The cams are fittable within slots (40, 240) in the housing proximal end when the cap is fully mounted to the apparatus.

Abstract: Low-dosage syringes for use in administering small dosages of medicine are disclosed. An illustrative low-dosage syringe can include an elongate syringe barrel having an interior chamber adapted to receive a supply of fluid, a plunger member slidably disposed within the interior chamber, and a tip member defining an inner lumen in fluid communication with the interior chamber. The configuration of the syringe barrel, including the wall thickness of the barrel relative to the outer diameter and to the length of the barrel, may permit small dosages of medicine to be accurately administered while also allowing the user to easily manipulate the syringe barrel with their fingers.

Abstract: A single use retractable syringe (10) has an inner barrel (44) supporting a needle (16) at one end and is slidable within an outer barrel (11). In the packaged condition the inner barrel is in a position relative to the outer barrel such that the needle can be attached to a Luer connection on the inner barrel and projects from a first end (18) of the outer barrel. The inner barrel has first and second latching means (40, 41, 43) adjacent each end, respectively, and the outer barrel has retaining means (48) on the inner wall surface adjacent the second end thereof. When the inner barrel first latching means (40) is engaged with the retaining means the syringe is in position ready for use and after the first full depression of a plunger the inner barrel is released and moves to a position where the second latching means (41, 43) becomes permanently engaged with the retaining means.

Abstract: A retractable, single use syringe (10) comprises a barrel (20), a collar (60) mounted to the barrel, a retraction spring (70), a needle mount (40) located at a needle end (23) of the barrel and a plunger (30). The plunger comprises a first plunger member (31) and a second plunger member (33) that are releasably coupled to co-operatively maintain the retraction spring in an initial compressed state. The second plunger member (33) further comprises a seal (34) to prevent fluid leakage between plunger (30) and barrel (20). After depression of the plunger to deliver the fluid contents of the syringe, the first plunger member (31) engages the needle mount (40) with needle (12) attached thereto and is rotatably uncoupled from the second plunger member (33) to allow decompression of the retraction spring (70), which forces retraction of the first plunger member (31), needle mount (40) and needle (12) engaged therewith.

Abstract: A novel hub design that enables removal of nozzle core for disposal while the hub is retained for reuse. The reusable hub provides a cost advantage over a one-piece metal design, enabling the use of a dispensing system that is of high quality and low cost to proliferate the use of the technology in the industry. Using this method, a nozzle hub dispensing system has a very favorable impact on the environment, 90% less hazardous waste with a reusable hub system, as only the lightweight cores are disposed. This nozzle hub provides a positive locking, tool-less mechanical connection of nozzle core to hub, which offers a financial advantage over competitive products.

Abstract: A two-component mixing type pre-filled syringe 1 includes a nozzle member 20, a barrel 10 formed with a bypass 13 protruding outwardly in a radial direction, a tip gasket 60 sealing a tip of the barrel 10, an intermediate gasket 70 liquid-tightly partitioning an inside of the barrel 10 into a front chamber 11 and a rear chamber 12 accommodating a liquid medicine L, and a plunger gasket 80 located in a base end side relative to the intermediate gasket 70 and sealing the inside of the barrel 10, and includes a construction in which the intermediate gasket 70 has at least one seal part 71 contacting an inner wall of the barrel 10, and a bypass communication passage 72 providing communication between the front chamber 11 and the rear chamber 12 in cooperation with the bypass 13.

Abstract: Methods of arthroscopic harvesting of bone marrow aspirate from bone joints and therapeutic application of the bone marrow aspirate in a bone joint. The method of harvesting includes extracting bone marrow from a joint, adding a biomaterial, and adding clotting agent to form a clot.

Abstract: Embodiments of an injector, injector system, syringe, syringe interface, syringe adapter, and piston/plunger assembly for an injector (of contrast medium, for example) are described. Preferably, the syringe is adapted to engage a syringe interface mechanism such that the syringe may be seated within an injector without regard to any particular orientation of the syringe about its axis with respect to the injector.

Abstract: An injection device comprises a syringe (1) extendible against a spring bias (9) from a retracted position in a housing (2) to a projecting injecting position. A spring biased plunger has collapsible elbows (10) which, when the plunger is released, initially engage the end of the syringe to drive it to the projecting position, whereupon arresting of the syringe movement causes the elbows to collapse inside the syringe to allow the plunger to engage and drive the bung (3).

Abstract: A method and apparatus for administering a pharmaceutical. The method employs a delivery device including a housing, a pharmaceutical containing needled syringe movable within the housing, an activation button disposed at one of the housing, and wherein the housing is flared radially outward at the other end and designed to allow visibility of the needled syringe. A skin-contacting surface of the housing at the flared end is designed to limit slippage along the skin, and at least one injection targeting guide is provided.

Abstract: An administering apparatus for delivering a dosage of product including a casing with a reservoir for the product, a piston within the reservoir to deliver the product, a piston rod for engaging the piston, a drive device for driving the piston rod, and a dosage setting member mechanically engaging the piston rod and a stopper for the dosage setting member. The casing includes a front casing section containing a reservoir for the product and a rear casing section detachably connected to the front casing section. The front casing section is connected to or forms a first latching element, and the rear casing section is connected to or forms a second latching element. The latching elements are in latching engagement when the casing sections are connected. The casing sections may be axially fixed to one another by the latching engagement.

Abstract: A syringe barrel is provided with a hollow barrel body, a needle fitting arranged extending in an axial direction from a front end of the barrel body, and a finger flange arranged extending in an outward direction from a rear end of the barrel body. The syringe barrel features that a contour of the barrel body is a polygon in a cross-section taken at right angles to a central axis of the barrel body or that the barrel body is provided with at least one planar surface section formed on an outer peripheral wall of the barrel body. A syringe includes the above-described syringe barrel, a plunger slidably inserted in the syringe barrel, and a piston secured on the plunger.

Abstract: A process for creating a stop surface on a plunger rod of a syringe is disclosed. The process includes the step of providing a preformed or molded plunger rod, and the step of forming a radially-extending deformation on the molded plunger rod. The presently disclosed in-line process allows for the use of a single molding rod to form plunger rods having one or more selectively located stop positions.

Abstract: A process for filing a syringe in which a longitudinal tubular syringe barrel has a first end closed by a movable plunger and a connection suitable for an injection needle at its second end, this second end of the bore being closed by a penetrable closure, and the syringe is filled by passing a filling needle through the penetrable closure and filing the barrel with a liquid via the needle, then withdrawing the filing needle from the closure. Suitably a penetrator is attached to the second end of the barrel to penetrate and provide communication through the closure.

Abstract: A disposable safety syringe includes a barrel body, a needle seat holding a needle in position, a plunger body, having an interior cavity, slidably mounted in the barrel body, and a needle retraction device including an end stopper, having a retraction ring, mounted in the plunger body, a compression spring mounted at the end stopper, and a retraction head integrally downwardly and integrally protruding from a bottom end of the needle seat to align with the retraction ring, wherein when the plunger body is kept moving towards the upper portion of the barrel body after the injection operation is completed, the retraction head is engaged with the retraction ring to couple the needle seat with the end stopper, such that the compression spring pushes the end stopper into the plunger body to retract the needle seat and the needle into the plunger body.

Abstract: A dosage device has a hollow barrel and a plunger slidable within the barrel, and a plurality of formations provided on the barrel and plunger and cooperating with one another to produce a sound signal, which corresponds to a predetermined dosage of fluid drawn into or displaced from the barrel. At least one of the barrel and plunger formations is configured to have a plurality of spaced-apart segments shaped and dimensioned to improve the quality of the sound signal.

Abstract: Apparatuses and methods for the effective implantation of viable cells into the body of a patient. Apparatuses and methods are disclosed that are particularly useful for the effective implantation of viable cells into a patient. The apparatuses preferably include a syringe with a small or zero dead volume, a cannula adapted for cell implantation, and a rotational chamber. The syringe is able to hold a cellular suspension for administration to a patient. The apparatuses and methods also preferably employ a small motor which is adapted to rotate the syringe, cannula, and rotational chamber slowly. That rotation reduces cell clumping in the cellular suspension and better maintains the cellular suspension during the implantation procedure. The apparatuses and methods are particularly well suited for the implantation of neurons into the brain of a patient. The apparatuses and methods may also be used to control the rate and volume of cell delivery during implantation precisely and in an automated manner.

Abstract: An apparatus that allows for separating and collecting a fraction of a sample. The apparatus, when used with a centrifuge, allows for the creation of at least three fractions in the apparatus. It also provides for a new method of extracting the buffy coat phase from a whole blood sample. A buoy system that may include a first buoy portion and a second buoy member operably interconnected may be used to form at least three fractions from a sample during a substantially single centrifugation process. Therefore, the separation of various fractions may be substantially quick and efficient.

Abstract: The syringe is formed according to DIN ISO 11040 and has a syringe barrel (1) with a syringe head (1a) formed on one end and a grip plate (4) formed at the other open end. An elastomeric piston stopper (6) is insertable in this open end, which is movable back and forth and which has a cruciform-cross-sectioned piston rod (7) screwed into it. A stop element, which reduces the interior diameter of the syringe barrel, is provided at the open end of the syringe barrel to perform a back-stop function, i.e. to prevent unintended withdrawal of the piston stopper. For this purpose a plastic part (2) connected to the grip plate (4) is provided with snap catches (3), which snap onto the inner side of the syringe barrel (1). These snap-catches (3) prevent the piston rod (7) from being rotated out of the piston stopper and the piston stopper (6) from being withdrawn from the syringe barrel. At the same time the finger support is enlarged.

Abstract: A medical delivery device comprising an elongate body having a plunger slidably and sealingly engaged to form a cavity to receive fluid materials and a first outlet disposed at an end of said body and has a male luer end portion and a valve assembly is disposed within the first outlet. The valve assembly has a valve means movable between an open position and a closed position and biasing means for biasing the valve means to a closed position. Actuating means are disposed within the male luer end portion and coupled to the valve means such that the valve means is movable to an open position when a female luer end portion of a medical accessory is coupled with the male luer end portion. A second outlet is disposed at the same end as the first outlet for controlling the exchange of gases from the environment to said cavity under the action of the plunger.

Abstract: A combined container-syringe is provided. A bypass chamber and front chamber is provided at a cylindrical tip. The bypass chamber has an inner diameter greater than the outer diameters of front and rear stoppers. The front stopper is inserted into the bypass chamber. The front chamber has an inner diameter equal to the inner diameter of a cylinder or not greater than the outer diameters of the front and rear stoppers and has a volume greater than the volume of a drug solution. A bypass groove is formed in the inner wall of the bypass chamber and allows the cylinder to communicate with the front chamber while bypassing the front stopper. Accordingly, it is possible to provide a combined container-syringe enabling observation of the condition of a drug solution filled therein before making an injection and thus to make an injection in a secure manner.

Abstract: A plunger rod assembly for use with a syringe barrel is provided and includes a plunger rod slidably disposable within the syringe barrel, wherein the plunger rod includes a hub extending distally from a distal end thereof and at least two tabs extending outwardly therefrom. The syringe further includes a plug configured for slidable disposition in the syringe barrel and configured for selective connection to the plunger rod via a bayonet-type engagement. The plug includes a base wall having at least two resilient fingers supported on a first side thereof, wherein each resilient finger is configured to snap-fit engage a respective tab of the plunger rod during connection of the plug to the plunger rod; and a plunger tip supported on a second side of the base wall, opposite the first side, and being configured to form a substantially fluid tight seal with an inner surface of the syringe barrel.

Abstract: An arterial blood collection device is provided having a one-piece plunger rod for use with a blood collection syringe. The plunger rod is hollow, with a closed front end. A self-sealing filter is provided within the closed front end of the plunger rod. Vents are spaced radially about the front end of the plunger rod for fluid communication into the hollow interior thereof. The plunger rod is intended for use in slidable communication within a syringe barrel. In use, the plunger can be retracted within the syringe barrel to form a cavity therein. Upon arterial blood contact, the cavity fills with blood and air can be expelled from the cavity through the vents and the filter and out to ambient air. The plunger rod is a one-piece assembly, eliminating the need for a separate rubber plunger seal.