Abstract: The present invention is a syringe plunger stem with band-like sealing means on one end and fingergrip means on the opposite end and being slidably and sealably insertable into the body of a syringe to variate the volume capacity of the chamber of said syringe. In the plunger there is a capillary action view-tube, positioned in constant sealing contact with the said band-like sealing means and extending longitudinally towards said fingergrip end of said plunger. Further, an air-permeable, liquid impervious porous material is positioned in the said capillary action view-tube that is nearest the said fingergrip end of the plunger. The said capillary action view-tube communicating with and positioned between the said chamber of said syringe and the said air-permeable, liquid impervious porous material. The present invention may also provide a secondary chamber area in the plunger.

Abstract: The prefilled single-dose syringe 10 in the application features a barrel 11 provided with an narrowed-diameter portion 27 or neck and a rim surrounding its opening; a nozzle 12 equipped with finger stubs and a needle-carrying ferrule 13 transpierced by an axial channel 31; and a stoppering device 23 featuring an elastomer stoppering cork mounted at the end of a bracing ferrule that is attached to the bottom of the nozzle. This lower end of the bracing ferrule fits onto a collar, in the shape of a truncated cone, that is part of the bottom of the nozzle. This collar serves as a support for a membrane microfilter 28, which is pressed between the opposing surfaces of the bracing ferrule and the filter-carrying ferrule.

Abstract: A syringe device for obtaining a gas-free blood sample has a tubular body connected to an hypodermic needle. The tubular body receives a resilient sealing member operatively connected to a plunger rod. The sealing member and plunger rod have a vent formed longitudinally therealong to provide a passageway for the purge of air as an interior chamber of the tubular body is filled with blood. The passageway is covered with an hydrophobic filter allowing the passage of air until such time as blood completely contacts the filter, at which time blood cannot cross the hydrophobic filter. The interior chamber containing the blood sample is then purged of all air.

Abstract: A device used in detecting bacteria, fungi, and viruses in blood circulated through a particulate adsorbent material initially in a housing has a piston for pushing the adsorbent material from the housing for the detection. The piston preferably provides one passage for circulating the blood through the adsorbent material in the housing. An O-ring on the piston preferably indicates when the device has been used.

Abstract: A method is described for coating a hydrophobic filter membrane so as to render said membrane hydrophilic. This method is particularly for treating polypropylene or polytetrafluoroethylene in which the filter membrane is contemplated to have a pore size not larger than two (2) microns. The treating solution has Triethanolamine Dodecylbenzene Sulfonate (LAS) as the active ingredient. This treatment may use heated air (125.degree. to 200.degree. F.) as a drying assist which renders the membrane to have a substantially instantaneous "wet-out".

Abstract: An improved pre-evacuated blood sampling collection tube having two oppositely positioned rubber stoppers sealing the corresponding oppositely positioned open ends of the said cylindrical tube, and interposed within the said tube is a slideable perpendicularly placed filtration disc that filters and separates the cellular elements of the whole blood from its fluid counterpart during the process of centrifugation. One embodiment of the tube having a special structural extension baffle at one of the two sealing rubber stoppers, said structural extension found proximal to the puncturable entrant area of the blood specimen into the tube, acts as the structural baffle that prevents or curtails hymolysis of the red blood cells during the sudden onrush of blood from the blood source through the bore of the collection needle, and into the vacuum of the said collection tube.

Abstract: A pipette having a liquid receiving hollow generally encompassed by deformable side walls, the pipette further has a tapered liquid outlet extending from one end of the hollow and a liquid inlet on the other end of the hollow within which is located a semi-permeable filter.

Abstract: This invention relates to an improved plunger subassembly for use in a blood gas syringe barrel characterized by a pushrod having a piston on its front end with a hollow interior defining a fluid collection chamber communicating with both the front and rear ends thereof by passageways blocked by a filter that will pass gases but is impervious to fluids. With the plunger subassembly in its passive state, blood and gas entering the syringe barrel from the front is free to enter the collection chamber by means of slits on the periphery of the piston at its front end. The contaminated blood that has been in contact with the air originally in the syringe barrel is trapped in the fluid collection chamber inside the piston while the gases pass on through the filter and are vented to the atmosphere. Opposed surfaces on the pushrod and piston cooperate to define an air-tight seal effective to prevent the flow of air past the piston when the plunger subassemlby is actuated to retract same.

Abstract: A microfilter and method for infusion of blood and blood components into premature or neonatal infants designed to be utilized as an interruption filter between the syringe carrying the blood to be transfused and the needle injected into the vein of the patient or stopcock connections to the vasculature of the patient. The filter of this invention includes a filter body adapted to engage a syringe nipple and a needle hub, or standard luer taper fitting. The square body of this filter encases a stainless steel filter screen passing particles of less than 18 microns in diameter and restricting or trapping particles of larger diameter. The filter functions by a sieving or direct interruption of passage of larger microaggregates. The filter is specifically designed for utilization one time only. The method includes transfusing 5 to 20 cc of blood while screening out particles of less than 18 microns.

Abstract: A syringe comprises a main tubular body, the body being open at one end and receiving a hypodermic needle at the other end, and a plunger, one end of the plunger extending into the body, through the open end thereof, the plunger having a longitudinal passageway therein permitting air flow therethrough. A fluid-tight seal is formed between the outside surface of the plunger and the inside surface of the syringe body. An air permeable filter member extends across the first end of the plunger, in the passageway, whereby the body can fill with blood, causing the air in the body to pass through the filter member to the open end of the body. The blood does not flow through the filter. A valve extends across the passageway and allows the syringe to be used to aspirate in the absence of natural blood pressure.

Abstract: A needle assembly for use with a hypodermic syringe having a snout, which comprises a needle, a needle holder having a flare bore section for coupling with the snout of the syringe and a hollow pipe provided in the flared bore section of the needle holder. The pipe is shaped and sized to be inserted in a snout hole when the needle holder couples with the snout through the flared bore section formed therein. The pipe has a passage which communicates with a needle bore through a narrow hole formed in the needle holder. A filter may be provided in the needle holder. The quantity of liquid medicine left in the needle holder and the snout hole of the syringe after the injection is made extremely small. When the filter is provided in the needle holder, impurities can be removed.

Abstract: This invention pertains to an add-on device used with a conventional syringe having an outer barrel with a hollow needle mounted thereon. A tubular sheath has a first end slidably and removably mounted on this barrel with a second end retaining a flexible cap portion. Within this flexible cap end, two ampules are carried and are arranged as peas-in-a-pod with both ampules made of rigid thin impervious material such as glass and/or plastic. The inner ampule retains the concentrate, usually powder, and the outer ampule contains the fluid. A filter, such as stacked disks, is interposed between the distal end of the hollow needle and the ampules. The flexible cap end is manipulated to cause the two ampules to be broken after which the contained components are mixed by shaking and this mixture is drawn by aspiration through the filter into the syringe. The add-on device is then discarded and the now filled syringe is used in the conventional manner.

Abstract: A hub device for use in transferring liquids therethrough in opposite directions includes a housing having an internal chamber and two openings communicating with the chamber. A filter is in the chamber and is adapted to filter particulate matter from liquids. A dual-element valve allows liquid flowing through the chamber from one of the openings toward the other to pass through the filter in one direction of flow, but not the other.