Abstract: A hyperdermic syringe having a plunger which separates from a piston inside a barrel of the syringe after a downward stroke of the plunger preventing reuse of the syringe. The plunger breaks breakaway portions mounted inside the piston when pushed downward to unload the syringe effectively separating the plunger from the piston and destroying the syringe, preventing the piston from being withdrawn for the purpose of reloading the syringe. In another embodiment, a connector is used to releasably engage a plunger to a piston. Downward movement of the plunger causes upward extensions of the connector to move toward each other and lock together. The plunger disengages from the connector and piston after the extension lock together. A modified tip portion of a barrel containing a valve ball and valve flaps may be used to prevent the syringe from being used after a single use discharging medicinal fluid from the syringe. The valve ball blocks flow of medicinal fluid into the syringe after use of the syringe.

Abstract: For free-hand use by a dentist, there is provided a cylinder containing tooth filling material urged out of the cylinder by spring pressure, sometimes augmented by thumb pressure against the end of a piston rod in the cylinder. Flow of the material out of the cylinder through a removable and replaceable flexible curved nozzle is under control of a valve located to be readily manipulated between open and closed positions by the same hand of the dentist. Preferably the filling material is in a discrete capsule containing enough filling material for several teeth and easily placed in and removed from the cylinder.

Abstract: Intravenous fluid is supplied under the control of a microprocessor from a reservoir to a cannula through a flow member and a flow control device which responds, via the microprocessor, to the line pressures upstream and downstream of the control device. First and second transducers and first and second check valves are connected respectively upstream and downstream of the control device, and a constant flow resistance device is connected in series with the flow-control device to enhance the accuracy of the system.

Abstract: A needle hub for use with a syringe in obtaining biopsy specimens. A needle is inserted into the area from which a specimen is to be taken. A vacuum is pulled on the needle lumen to cause tissue to be drawn into the lumen. A special vacuum release is provided on the needle hub so that a surgeon can roll back an O-ring in the hub to expose the interior of the hub to atmosphere, thus releasing the vacuum pull on the needle lumen and allowing the needle to be withdrawn without dilution of the specimen, or contamination by material from other sites.

Abstract: A single use syringe having an interacting piston and cylinder which cooperate to define a variable volume working space, the syringe includes a valve body located in the chamber so as to divide the chamber into a first and second sub-chamber, the valve body has valves which permit a liquid to be initially drawn into the syringe and then injected, but prevent a subsequent liquid being drawn into the syringe.

Abstract: A blood collecting valve (10) is provided with a structural input part (11.1) with a half moon shaped separating wall opening (18) as well as a structural output part (12.1) which is rotatable with respect to the structural input part with a seal face opening (23). Both are disposed outside of the rotational axis of the associated structural parts. Thereby, it is possible to bring the two opening into congruence with each other by rotating around the rotational axis or to again sealingly separate the same from each other.The mentioned common rotating of the structural input part and the structural output part and thereby the opening and closing of the blood collection valve may be performed by rotating a blood collecting cylinder (16) being inserted into the structural output part with an application conus (15). Hence, no separate manual handling is required for using the blood collection valve.

Abstract: A device for reducing the amount of particulate contaminant in a liquid is provided which includes a hollow elongate member having first and second openings and filter means, preferably depth filter means, positioned in the elongate member, the filter means in combination with the elongate member defining a reservoir between the filter means and the first opening. The device is intended to be used with means associated with the first opening for generating a pressure differential between the interior of the elongate member and the exterior thereof whereby a liquid containing particulate contaminant may be introduced into the reservoir in the elongate member through the second opening, particulate contaminant being trapped within the filter means and a liquid with a reduced particulate contaminant may be removed from the elongate member through the second opening.

Abstract: Air entrained in a pumped liquid is released from a pumping chamber operated by a single piston and having an outlet passage controlled by a back-seating valve biased closed by a spring, when the piston near the end of its compression stroke causes positive mechanical engagement to open the outlet valve.

Abstract: The drug dispensing set includes a reservoir having a cylinder for receiving a primary infusion solution at the proximal end and a piston which slides within the cylinder in seal-tight relation. The piston includes a one-way valve to permit passage of the primary infusion solution to the distal side of the piston under pump pressure. A Y-site or three-way valve is connected in the tubing downstream of the reservoir to permit infusion of a drug dosage into the distal end of the cylinder while the piston moves towards the proximal end of the cylinder under the pressure of the delivered drug dosage. The drug dosage is subsequently dispensed from the reservoir when the pump is re-started and the primary infusion solution following the drug dosage serves to flush the tubing of the drug dosage.

Abstract: The subject patient controlled analgesia (PCA) apparatus is mechanical/hydraulic and comprises a reservoir and a pump operable by the patient for dispensing medicine from the reservoir unto the patient's IV system in incremental doses. The pump capacity per stroke may be adjustable, thereby adjusting the size of each dose dispensed. Timing apparatus assures that a specific interval of time (the lockout interval) must pass between sequential dosage dispensations. Check valves in the passages for pumping the medicine and filling the apparatus are double in series to reduce chances of malfunction or misuse due to valve failure. The quantity of medicine in the reservoir is indicated.

Abstract: There are depicted two embodiments of an ambulatory disposable infusion delivery system in which fluid (drug) is fed to a substantially transparent receiving and retaining housing which has indicia markings conventionally applied to indicate quantity. The inflow of fluid causes an elastomeric member attached to a piston, which is slideable in a bore in this housing, to be moved, thus stretching this member. This tension provides an energy source (force) to push the fluid out of the bore when the connected tubing line is opened. The housing is provied with a discharge fluid conduit and a restrictor controlling the rate of flow. In both embodiments, the housing has a barrel with a substantially constant bore. The slideable piston in this bore has a resilient outer portion with at least two ribs providing sealing action while having a low coefficient of friction.

Abstract: A catheter introduction syringe for the introduction of a catheter or catheter guide wire into a patient's body, the catheter introduction syringe comprises a hollow substantially cylindrical syringe barrel to support a needle thereon having a substantially cylindrical plunger slidably disposed therein, the substantially cylindrical plunger includes a centrally disposed channel formed longitudinally therethrough having a valve assembly disposed in operative relationship relative to the centrally disposed channel to prevent passage of air or liquid therethrough during flushing or aspirating of the catheter introduction syringe and permit the introduction of a catheter or catheter guide wire through the centrally disposed channel, hollow substantially cylindrical syringe barrel and needle for introduction into the patient's body without the flow of air or liquid through the centrally disposed channel.

Abstract: A prefilled ampoule-syringe comprising an ampoule and an ampoule body having a single open end and a neck located near the single open end, the neck having a smaller transverse inner dimension then said body. A stopper, associated with an external capsule, has an internal conduit to allow communication between the interior of the ampoule body and the injection tip, the stopper being arranged for axial movement within said neck from a closed to an open position. An upper part of the stopper having at least one continuous annulus surface having a larger outer dimension than the inner dimension of the ampoule neck so as to be in a sealing compressed condition in the closed position and having a smaller outer dimension than the inner dimension of the ampoule body so as to be in a partly expanded condition in said open position to permit the flow of liquid from the ampoule body to the tip.

Abstract: A flow control apparatus for providing selective fluid communication with physiological organs includes a nozzle structure for multiple conduits, a syringe having a fluid chamber for containing and discharging fluids in communication with the nozzle structure, two valve members having respective engaged surfaces relatively rotatable to provide valving action, and a clamp structure which forces the valve members together to establish fluid-tight seal between their engaged surfaces. The first valve member has a plurality of through apertures respectively communicating with separate fluid ports in the nozzle, and the second valve member has a through passageway communicating with the syringe chamber; the passageway is further selectively communicatable with at least one of the apertures in the first valve member to enable fluid flow between the respective nozzle port and the syringe chamber.

Abstract: A single-use, self-annulling syringe is disclosed that is rendered inoperative after a single use without requiring any deliberate action on the part of a user. The injection device uses a hydrophilic expansion plug positioned in the outlet flow channel of the syringe, which expands a short time after being exposed to a drug containing water, thereby rendering the syringe inoperative.

Abstract: In a refillable injection device for use with a dilation catheter, a large bore syringe is used to refill a small bore syringe without disconnecting the syringe assembly from the catheter. A one-way valve prevents fluid from moving in the opposite direction. Movement of the small bore syringe plunger produces a high pressure, low volume flow and can be repeated if necessary after the small bore syringe is refilled. Subsequent movement of the large bore syringe plunger produces a low pressure, high volume flow.

Abstract: An aspiration assembly having dual co-axial check valves for pumping medical fluids with a hypodermic syringe, the assembly having a main body with two passageways in offset relationship to each other, with the passageways coming together at a large central cavity within the main body, a central support structure mounted within the central cavity of the main body, a pair of flexible resilient valve disks engaged by the central support structure, and a body cap having an outlet passageway therein for complementarily enclosing the central cavity of the main body and for retaining the central support structure and dual valve disk in co-axial relationship.

Abstract: A plug is provided within a port in a flexible container. Extending from the port is a piece of flexible tubing which is used to connect with other tubing in a fluid system. Fluid is dispensed from the flexible container by grasping the end of the plug extending into the flexible container. The plug is then pulled into the interior of the container so that the opposite end of the plug which seals the flexible tubing extending from the port is unseated. The flexible tubing extending from the port is now open to the flow of fluid from the flexible container.

Abstract: A noninvasive apparatus for temporarily assisting in the treatment of a sucking chest wound wherein a dome-shaped element having a one-way valve therein or connected thereto is positioned over the wound and strapped in substantially fluid-tight relationship with the patient's body.

Abstract: This device is adapted for taking venous blood samples without the aid of any auxiliary negative pressure. Venous blood pressure is the sole force which fills the device with the blood sample. The device includes a flexible plastic tube formed from polyethylene or the like and further includes a blood drawing needle mounted on one end of the tube. The tube is divided into a collection reservoir into which the sample is drawn, and a sampling reservoir into which the sample may be expressed from the collection area. A valve separates the two areas. Also included in an elastomeric needle closure which adapts the device for in situ centrifugation of the blood sample in a test tube.

Abstract: A vented blood gas syringe is capable of allowing arterial blood to enter into a specimen chamber due to blood pressure or due to the aspirating the blood into the chamber where insufficient blood pressure of the patient exists. The blood gas syringe is fabricated of conventional parts modified for venting. The plunger of a conventional syringe has air passages through the lower rib thereof to allow air to pass into the air space formed by the body of the plunger. The passages are further sized to restrict the flow of blood therethrough. A slice is made in the upper rib and at least one air passage is provided from the air space between the ribs to the slice. The upper portion of the upper rib above the slice becomes a flap which can act as a valve resting on a seat formed by the slice to allow air to pass upward but not downward.

Abstract: An implantable treatment device has a housing portion defining a chamber and a self-resealable cover portion which closes off the chamber to provide a fluid receiving reservoir. An exit port extends from the reservoir to the external surface of the housing, and a locking member affixed to the device permits a twist-lockable catheter connection to be securely sealed to the exit port. In one embodiment the locking member is a base plate having a slot therein to capture the flange of a catheter connection. A protruding tab on the catheter connection may be sutured to hold the twist-locked connection in a fixed orientation. A multi-reservoir and multi-catheter embodiment is shown. A preferred implantable multi-reservoir device includes tactile features palpable through the skin for distinguishing the different reservoirs, or identifying the contents thereof.

Abstract: This invention provides an automatic irrigation and evacuation device for use in laparoscopic procedures and surgery. The device comprises a means for directing a flow of liquid and, alternatively, applying a vacuum, through a single line. In the preferred embodiment of this invention, the device provides two different positive controls for alternatively directing a flow of sterile irrigating solution and applying a vacuum through a single line passed through a laparoscope housing into a patient. The two different controls prevent confusion by the operator of the device, increasing the safety of the patient during medical procedures. The invention also optionally includes an external "T" valve attachable to the exterior of the valve body of the present invention to provide convenient connections for a source of carbon dioxide to the laparoscope, surgical laser or both simultaneously.

Abstract: A device for a traumatic access to a blood vessel of a living organism through the cutaneous surface thereof. The device includes in combination an implantable device comprising a tubular segment for access to the blood vessel; a valving element for the tubular segment; a mechanism for controlling the blood flow through the valving element; a cover for sealing the proximal end of the tubular segment in the absence of the blood control mechanism; and a porous coating adapted to be colonized by tissue ingrowth and at least partially surrounding the implantable device. The porous coating is formed from a carbon-carbon composite material comprising a reinforcement formed from a carbon fiber porous substrate embedded in a carbonaceous matrix design to densify only partially the fiber substrate while connecting the carbon fibers together.

Abstract: A blood extraction cannula cap is provided with a skirt which can be inserted over a tube for receiving the blood, the upper portion of the skirt being closed and having a cannula bore for receiving a needle and a push button resiliently mounted on the end of the cap with the push button being connected to a closing member which closes a bore connecting the cannula to the interior of the cap.

Abstract: A device for administering a liquid in a number of doses, such as insulin to a patient, comprising a piston (3) in a pump chamber (4), a cannula (5) being connectable to the pump chamber, a piston rod (14) connected to the piston and having an operating button (25), a valve (1) and a reservoir (2), wherein by retracting the piston (3), at the same time the reservoir is connected to the pump chamber (4) through the valve in order to fill the pump chamber and the valve is moved into the position for closing the connecting element (6) between the pump chamber and the cannula (5) and wherein, by moving the piston forward, at the same time the connecting element between the pump chamber and the cannula is connected through the valve to the pump chamber and the valve is moved into the position for closing the passage (7) between the reservoir and the pump chamber.

Abstract: A compact, prefilled, ready-to-use, applicator for dispensing a medicament within a body cavity has a reservoir, an automatically-opening closure member and a telescoping plunger assembly. A closure member is disclosed, adapted to open responsive to the pressure of a medicament being dispensed, without disengaging from the reservoir in which the medicament is contained. A telescoping plunger assembly is disclosed, having impeller means disposed within the reservoir opposite the cap member and engaging means to lock the assembly in an extended position for urging the impeller means through the reservoir.

Abstract: A liquid dispensing apparatus is provided having a container for storing the liquid to be dispensed, an anti-drip valve cartridge connected to the container and a needle element connected to the valve cartridge. A device is provided for pressurizing the container for the duration of a time interval and for depressurizing the container to atmospheric pressure, simultaneously, with the end of the time interval. The valve cartridge has an outlet portion which sealably connects an outlet opening thereof in registry with the bore of the needle element. A pressure activated poppet valve can be provided in the valve cartridge to seal the outlet opening upon the depressurization of the container. After depressurization, a volume of liquid is left in the needle element which exerts a pressure at the end of the needle element that is less than the incoming atmospheric pressure.

Abstract: A prefilled ampoule-syringe of unitary dose comprises an ampoule being closed at one of its ends, the other end being open. The ampoule further comprises a narrowed zone. A hollow capsule is arranged at top of the opening of the ampoule. This capsule is connected to a movable stopper means comprising a stopper head and a hollow cylindrical member having a radial channel and a peripheral rim. This rim acts as a retention member during the storage and as a piston ring during the injection. In order to avoid the loss of its elasticity, the rim is located within a belt of enlarged diameter downstream from the narrowed zone during the storage.

Abstract: This buoyant blood stop valve is in the blood line to the patient to stop flow to prevent air embolism when the blood is exhausted from the oxygenator reservoir. The stop valve comprises a downwardly directed hemispherical cup next to the downwardly directed tubular inlet. The top of the cup is open to the inlet to permit free passage of air in and out of the top of the cup. The cup and inlet are formed in the upper valve body, and the lower valve body is secured thereto and faces the upper valve body. The bottom of the lower body has an outlet, and above the outlet is a circular valve seat, such as an O-ring in a recess. Above the O-ring the lower body has a curved bottom, but vanes are formed in the lower body and inwardly directed toward the outlet valve seat at the O-ring. Upper vanes adjacent the inlet are sloped toward the hemispherical cup.

Abstract: A hose assembly for use to regulate flow from a dispensing device that provides a generally constant pressure on a liquid to be dispersed. The hose assembly includes a length of capillary tubing through which the liquid must pass as it is dispersed which has a length of at least 45 centimeters and a volume of less than about 0.25 cubic centimeters so that the assembly can provide a slow steady predetermined flow rate while containing a small amount of the liquid being dispensed.

Abstract: A syringe has a chamber isolated from an open ended barrel. A valve provides fluid communication between the chamber and barrel and an outlet. In an alternative form the chamber is within a structurally independent cell that may be mounted to a conventional syringe in piggyback fashion.

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: In a seal for two compartment mixing syringe having an outer barrel with an inner barrel partially disposed therein, and a seal on the dispensing end of the inner barrel, and a plunger disposed in the inner barrel, the improvement is wherein the seal is a combination of an aperture in the dispensing end of the inner barrel and a plug disposed in the aperture. The plug has a cylindrical portion of resilient and compressible material adapted to be compressibly disposed in the aperture but displaceable from the aperture by fluid pressure exerted by movement of the plunger in the inner barrel. A reduced diameter portion of the plug provides a fluid pathway between the inner barrel and the outer barrel when the cylindrical portion is displaced from the aperture by such fluid pressure. An increased diameter portion prevents the plug from passing through the aperture and into the outer barrel.

Abstract: Disclosed is an exchange transfusion device with two coupled, automatically driven syringes, one in a blood withdrawal system and one in a fresh blood injection system; the coupling insuring that the volume of blood removed from a baby in the withdrawal system will be simultaneously replaced by an equal volume of fresh blood from the injection system. This simultaneous equivolumetric withdrawal and injection overcomes the physiological problems arising from the non-simultaneity of equal volumes of withdrawal and injection. The syringes in the withdrawal and injection phase of an exchange transfusion are driven at a slow steady rate, but on the refill and discard phase are driven at a high rate to avoid clotting of standing blood in the withdrawal and injection systems.

Abstract: The automatic check valve is proposed to be used with male luer fittings which are the standard on many medical applications. The valve body is a piece of resilient tubing into which a stopper having an oval sealing ring is placed. Inserting the round male luer fitting causes the tube to be made round releasing the seal of the stopper at two points on the minor axis of the oval shape.

Abstract: Inflating and deflating device adapted to be used by a human hand. It comprises a housing and a syringe carried by the housing. The syringe comprises a syringe body having an outlet through which liquid can pass and a piston slidably mounted in the syringe body and forming a sealing engagement with the body. A piston rod is secured to the piston and extends out of the body. A tubular member is provided. A connector means connects the tubular member to the outlet of the syringe body. A handle is carried by the housing and is secured to the syringe for causing relative movement between the piston and the syringe body. The handle means includes first and second portions movable with respect to each other. The first portion is secured to one of said piston rod or said syringe body and the other said portions are secured to one of the other of said piston rod and said syringe body.

Abstract: A single or multiple liquid sample needle assembly is provided. The assembly includes a housing with a receiving chamber having translucent or transparent walls for determining whether access to the sample in question has been achieved. The invention utilizes a porous plug in the chamber which provides, simultaneously, a liquid barrier for the sample received, and gas displacement venting means for gas displaced by the liquid sample received. The assembly may be modified to receive only a single sample for subsequent discharge to a vacuum collection device, or multiple samples for sequential discharge to a plurality of vacuum collection devices. For multiple collection, the assembly incorporates a flexible sleeve and a separate gas discharge opening in combination with the sample discharge opening of the assembly.

Abstract: A prefillable type of hypodermic syringe assembly is disclosed herein. This assembly utilizes an open-ended glass barrel in combination with a rubber sealing bung located across the front end of the barrel and a rubber plunger slidably disposed within the barrel behind the sealing bung so as to define an internal medication chamber. In this way, medication stored within the chamber comes in contact with glass and rubber only until the syringe assembly is used. At that time, a syringe needle is placed in fluid communication with a cooperating opening through the sealing bung which serves to pass medication from the internal chamber to the needle. Until the syringe assembly is used, the sealing bung is maintained in a collapsed condition to close its through opening, thereby ensuring that only rubber and glass come in contact with the stored medication.