Abstract: An apparatus regulates fluid flow supplied to a patient through an intravenous infusion system. The apparatus includes a first fluid passageway, a second fluid passageway, an inlet, and a control device. The first fluid passageway is for discharging fluid therefrom at a first predetermined rate of flow. The second fluid passageway is for discharging fluid therefrom at a second predetermined rate of flow, wherein the second predetermined rate of flow is different than the first predetermined rate of flow. The inlet is in flow communication with the first and second fluid passageways. The control device is between the inlet and the first and second fluid passageways, and is variably positionable for controlling fluid flow into the first and second fluid passageways.

Abstract: The invention relates to a device for injecting liquid, comprising a piece of tubing on which there is situated at least a first liquid occlusion system. According to the invention, a regulation system (4) is situated upstream from the first occlusion system, the two systems defining an intermediate segment in which the pressure, in the absence of injection, is greater than the pressure that exists downstream from the first occlusion system so as to direct any leak of liquid from the first occlusion system downstream. The invention is applicable to a pump used for injecting contrast liquid for medical imaging.

Abstract: A valve has a flow restrictor positioned outside of a lumen of a tube, which transitions between an open configuration and a closed configuration. The valve further contains a closing mechanism that automatically positions the flow restrictor to the closed configuration when a pressure in a fluid within the lumen is below a low threshold pressure, and an opening mechanism that automatically positions the first flow restrictor to the open configuration when the pressure in the fluid within the lumen is above a high threshold pressure that is higher than the low threshold pressure. The flow restrictor is preferably positioned outside the tube, although it may be positioned inside the wall of the tube, or even within the lumen of the tube. There may also be a second, downstream flow restrictor. The opening and closing mechanisms advantageously comprise a magnet or solenoid. The tube may comprise a catheter, and especially a urinary catheter.

Abstract: A needleless connector for medical use, adapted to facilitate the flow of fluid therethrough, includes a housing having an inlet port and an outlet port. The connector also includes a flex-tube assembly defining a fluid path between the inlet port and the outlet port. The flex-tube assembly is movable between uncompressed and compressed states. The flex-tube assembly has a first internal volume when in the uncompressed state and a second internal volume, greater than or substantially equal to the first internal volume, when in the compressed state.

Abstract: Disclosed is a check valve for placement near the distal end of a catheter. A continuously smooth outer surface for the catheter with check valve system assures that there is no propensity for a blood clot to form in cracks on the system's outer surface. The system is also designed to disallow any part of the valve from separating from the catheter. The check valve is a formed from a low durometer, highly elastic, elastomer cylindrical tube that is shrunk into a cylindrical groove that would typically be located near the catheter's distal end. When pressurized fluid is injected through the catheter, the cylinder that is placed over one or more holes in the cylindrical groove in the catheter is forced to expand radially outward which allows the fluid to be injected into the blood vessel. When the pressure is removed, the elastomer tube retracts to its normal position which position tightly covers the holes thereby preventing any blood from entering the catheter.

Abstract: A fluid delivery system for delivery of an injection fluid to a patient generally includes a pump system to pressurize the injection fluid, a patient interface in removable fluid connection with the pump system, and a connector in fluid connection between the pump system and the patient interface. The pump system is connected to an inlet of the connector, and the patient interface is removably connected to an outlet of the connector. The connector includes a sealing member at least partly disposed within a housing of the connector that is biased to close the outlet when the patient interface is removed.

Abstract: An apparatus and method for preventing free flow through an infusion set utilizes an occluder disposed within the infusion set to selectively prevent flow therethrough. The occluder may be responsive to a pressure differential within the infusion set or may respond to compression of the infusion set. When a pair of occluders are used in sequence, an in-line pump may be formed.

Abstract: A multiple-dose bottle with dosage nozzle for liquids, particularly for pharmaceutical products, is deformable and has a nozzle (2) which comprises a valve (3) made of flexible material which can be coupled to the mouth (4) of the bottle (1) and has a plurality of passages (5) for the flow of the liquid and a cap (6) made of substantially rigid material which is fitted hermetically on the valve (3) and is provided, in an upward region, with a dispensing opening (7), compression of the bottle (1) producing the compression of the valve (3), the flow of the liquid between the valve (3) and the cap (6), and the release of the liquid through the dispensing opening (7).

Abstract: An anti-reflux valve for restricting flow in one direction through a catheter toward a collection reservoir. The valve includes a check valve positioned within a segment of the catheter. The valve includes a proximal end bonded to an inside periphery of an interior of the catheter. The valve includes a pliable side wall that reduces in diameter to a distal end having an opening that is collapsible upon itself. Fluid flow is allowed through the catheter segment having the check valve therein, with flow only permitted from the proximal end and through the distal end for release into a collection reservoir. The distal end opening collapses upon itself to negate the counter-current flow of fluid through the distal end. A plurality of check valves are aligned in series to reduce the possibility of reflux flow of fluids. A method of utilization of the anti-reflux valve is also disclosed.

Abstract: A low-pressure fluid flow control magnetic valve (cycler) device, system and method for use emptying the contents of bladder by a catheter. The device can be connected with a specified drainage tubing to function as a hydrodynamically balanced system (to empty into a typical two-liter collection bag). The cycler can be connected externally to a urinary catheter for hospital, clinical and home-care use for the emptying of the bladder of a patient through a catheter in a biologically more natural, filling and draining, cyclic manner. Fully automatic, modes of operation are provided for opening and closing this valve to empty the bladder of urine when appropriate or necessary. The modes of operation respond to normal human (or animal) body pressures, or are automatic with a manual override. This device is U.S.F.D.A. approved for human use and responds to normal human (or animal) body pressures to assist the detrusor muscle to function normally in spite of an indwelling catheter challenge.

Abstract: A closed system, needleless valve device includes a generally tubular body defining an internal cavity. On the proximal end of the body there is an opening which is preferably sufficiently large to receive an ANSI standard tip of a medical implement. The distal end of the body has a generally tubular skirt. The valve also includes a hollow spike having a closed tip. The spike includes at least one longitudinal 18-gauge hole located distal the tip, and is seated inside the cavity such that the tip is below the proximal end of the body. An annular support cuff is connected to the spike which seals off a portion of the cavity of the body such that an upper cavity containing the tip is defined. The valve also includes a plastic, resilient silicone seal which fills the upper cavity and opening and covers the tip of the spike so as to present a flush surface. An adaptor enables the valve to be attached to a resealable container.

Abstract: A buret with foot valve for medical infusion equipment, including a transparent cylindrical container having a bottom wall with a central outlet hole for outlet of the liquid and a lateral graduated scale for indication of the level of the liquid. A float disk co-operates inside the container with the graduated scale for immediate identification of the level of the liquid, and a valve obturator is associated to the float disk for closing the outlet hole when the liquid inside the container comes to an end. The valve obturator is floating with respect to the float disk.

Abstract: An automatic manifold for a catheter assembly. Valve means automatically open and close flow between a liquid supply port for connection to injection means and a liquid delivery port for communication with the catheter assembly. A pressure sensor is integrated into the manifold. The manifold also includes a quick-disconnect coupling mechanism for a liquid supply port.

Abstract: A guidewire having a proximal hypotube portion with an insert to increase pushability and torqueability. The insert may comprise metals such as stainless steel, shape memory/super elastic materials such as nickel titanium alloys, composite materials or polymeric materials. The proximal end of the insert may be configured to dock with an extension guidewire. Preferably, the proximal end of the solid core distal portion of the guidewire is configured to fit within the hypotube and the two are secured by adhesive, solder or the like.

Abstract: A closed system irrigation connector for use with both 3-way and 2-way urinary catheters is disclosed. The connector fits all urinary catheters and accepts continuous irrigation sets as well as all bulb, piston, and Toomey catheter tip irrigation syringes. The connector eliminates the use of catheter plugs and reduces the mess and leakage often associated with present urinary catheter irrigation procedures. The connector converts an open procedure to a closed system procedure protecting the patient from outside contamination to reduce urinary tract infections as well as the clinician from potentially infectious body fluids. It comprises an assembly of a plastic housing with an internal silicone diaphragm slit valve and a plastic entrance port that are unitized in assembly by sonic welding. The entrance port forms a tapered wedge lock engagement with irrigation sets as well as catheter tip irrigation syringes.

Abstract: A hemostasis cannula unit including a valve housing, a cap, and a hemostasis valve, wherein the hemostasis valve includes a proximal valve gasket and a distal valve gasket compressed against the valve gasket by the valve housing, wherein the proximal valve gasket is the same shape as the distal valve gasket.

Abstract: A microsurgical irrigation device, comprising a first tube for supplying liquid from a liquid source, the first tube having a first end in communication with the liquid source, and further having a second end; an elastomeric bulb connected to the second end of the first tube, wherein the bulb is in communication with the first tube; a second tube for dispensing liquid expelled from the elastomeric bulb, the second tube having a first end connected to the bulb and further having a second end, wherein the second tube is in communication with the bulb; an inlet, one-way, valve preventing liquid from returning from the bulb into the first tube when the bulb is actuated, and allowing liquid to flow from the first tube into the bulb when the bulb is released; and an outlet, one-way, valve preventing liquid from exiting the bulb until a predetermined amount of pressure is provided by bulb actuation.

Abstract: A first object of the invention is to provide a medical device capable of effectively preventing backwards flow of blood.

Abstract: A medical instrument for irrigation and/or suction has an instrument body in which at least one flow channel is present for the passage of a fluid, at least one shut-off member for alternately shutting off the at least one flow channel, and an actuating member for actuating the shut-off member. The at least one shut-off member is a ball which, in a closure position, lies sealingly on a sealing edge of the flow channel so that it closes off the internal cross section of the flow channel, the ball being movable, between the closure position for closing the flow channel and a release position for freeing the flow channel, substantially in a direction transverse to the longitudinal direction of the flow channel, and the actuating member for moving the ball between the closure position and the release position being movable in a direction transverse to the flow channel.

Abstract: A contrast fluid delivery method and system includes a multiple-reuse filling section for attachment by conduit to a contrast fluid supply container, and a delivery section that is removably attached to the filling section for delivering contrast fluid held in the filling section to a patient. The filling section includes a main body having a fluid chamber, a contrast fluid filling inlet with a gravity-operated valve, an opening for connecting an operable power syringe, and a contrast fluid outlet fed through a spring-loaded one-way check valve. The delivery section includes a first delivery conduit connected between the contrast fluid outlet of the main body and the fluid inlet of an inline aspirator syringe, and a second delivery conduit connected at one end to a fluid outlet of the aspirator syringe and at the other to a catheter for delivering the contrast fluid to a patient.

Abstract: An apparatus and method for preventing free flow through an infusion set utilizes an occluder disposed within the infusion set to selectively prevent flow therethrough. The occluder may be responsive to a pressure differential within the infusion set or may respond to compression of the infusion set. When a pair of occluders are used in sequence, an in-line pump may be formed.

Abstract: A contrast fluid delivery method and system includes a multiple-reuse filling section for attachment by conduit to a contrast fluid supply container, and a delivery section that is removably attached to the filling section for delivering contrast fluid held in the filling section to a patient. The filling section includes a main body having a fluid chamber, a contrast fluid filling inlet with a gravity-operated valve, an opening for connecting an operable power syringe, and a contrast fluid outlet fed through a spring-loaded one-way check valve. The delivery section includes a first delivery conduit connected between the contrast fluid outlet of the main body and the fluid inlet of an inline aspirator syringe, and a second delivery conduit connected at one end to a fluid outlet of the aspirator syringe and at the other to a catheter for delivering the contrast fluid to a patient.

Abstract: A tubular instrument, e.g., a catheter including a hollow wall portion forming the distal end of the instrument and terminating at a distal opening, having a connector arranged to be used with a guide-wire. The guide wire has a distal end portion and a proximal end portion, the distal end portion of the guide-wire being arranged to be extended to some interior position within the body of a living being, with the proximal end portion of the guide-wire being located outside the being's body. The connector is located at the distal end of the instrument and is arranged to be readily manipulated by a twisting action to connect the instrument onto the guide-wire for sliding movement therealong. In particular, the connector establishes a path into which a portion of the guide-wire can be inserted from a lateral direction by merely twisting the instrument, without requiring access to either end of the guide-wire. In one embodiment the path is a spiral channel formed in the hollow wall portion of the instrument.

Abstract: A dual port vascular access assembly comprises a first access port and a second access port. The linkage is coupled between the first access port to close the second access port in the absence of an access tube in the first access port. Such port assemblies are particularly useful for implantation in patients receiving hemodialysis. By connecting the first access port to the blood withdrawal side of the system, blood withdrawal will be automatically terminated upon cessation of blood returned to due loss of the return access tube in the port assembly.

Abstract: An infusion rate adjusting device for drug solution injectors comprises a tubular flow control unit including plural check valves of different opening pressures, and means for selecting one of said check valves to adjust an infusion rate of the drug solution. The infusion rate adjusting device is simple in operation to set out an infusion rate of the drug solution and is considerably reduced in the production cost.

Abstract: A valve, insertable in a standard catheter, prevents undesired backflow of fluid and provides for blood samples to be taken through a standard catheter. This valve is a check valve having a housing with a check plate mounted therein.

Abstract: An apparatus wherein the primary dye source is connected to a secondary dye source with sufficient safeguards, including at least one-way check valve and at least one stopcock between the primary dye source and the secondary dye source, to assure a sterile barrier between the primary and secondary dye sources so that less than the total amount of fluid can be transferred from the primary dye source in an amount sufficient to perform a cardiac catheterization procedure.

Abstract: A device for dispensing fluid including a pressure-operated reservoir and a dose-metering head communicating with the reservoir to permit at least partial flow of the fluid to at least one outlet opening, the head including a fixed body and a membrane which, when at rest, comes into surface contact with at least a part of the fixed body on which the membrane is tightly mounted, the outlet opening being provided on an external element, wherein tightening of the membrane, during pressure operation of the reservoir, permits a flow from the reservoir via a peripheral space delimited by the membrane and by the part of the fixed body and which forms a passage for the fluid to the outlet opening, and, in the absence of pressure on the reservoir, to permit the membrane to occupy an equilibrium position in which the membrane is in surface contact with the part of the fixed body, by the intermediary of a thin film of fluid, essentially closing off the passage for the fluid, which essentially tightens the communication

Abstract: A check valve and, in particular, an anti-siphon valve, for medical infusion lines and the like, including an axial upstream passageway and an axial downstream passageway, staggered and parallel with respect to each other, and a diaphragm of elastic material cooperating with an annular valve seat for normally keeping communication between these passageways closed. The diaphragm is composed of the end wall of a cup-shaped element on which a plunger rests coaxially, the plunger being slidable between a retracted inoperative position and an advanced operative position. Valve opening occurs following flexion of the diaphragm, which can be spontaneous due to a predetermined fluid pressure developing in the upstream passageway, or positively operated via the plunger (9).

Abstract: A needless connector is provided which utilizes a resealable preslit septum valve. The valve is resiliently restrained relative to a housing with the valve and housing configured to accept a standard male luer lock having a luer tip which penetrates the valve through the opening to extend within the housing and a luer locking flange of the luer lock extending about the housing. The valve includes a disk shaped upper portion covering the opening, a lower portion spaced from the housing and extending downward from the disk shaped portion into a passageway defined by the housing, and an annular skirt to attach the septum to the housing. The connector exhibits satisfactory leak pressure after multiple connections and disconnects to the luer lock fitting and long periods of indwell of the luer tip.

Abstract: A catheter for use in vasculature or other body lumen includes a fluid injection bypass tube, leading to a elastically compressible pump bulb. Upon compression of the pump bulb, fluid such as contrast solution is injected through a one-way valve, into the catheter manifold lumen, and ultimately to the distal end of the catheter lumen, and into the patient vasculature. The one-way valve between the pump bulb and the catheter lumen has a threshold pressure to prevent unintended aspiration of fluid from the pump bulb during aspiration of fluid from the catheter itself.

Abstract: A vacuum adjustment valve, particularly for thoracic drainage devices, which comprises a valve body arranged in the air intake duct and tuning a first region connected to the intake duct and a second region connected to the drainage device. A regulator is arranged between the regions, is struck by the air stream and is operatively connected to a flow control element which controls a port for connection between the second region and an environment at atmospheric pressure. Adjustable elastic closure elements act on the flow control element.

Abstract: Needleless vascular infusion port apparatuses are disclosed. The infusion ports include a needleless valve that permits infusion of a liquid into the infusion port without use of a sharp.

Abstract: An infusion apparatus comprises a plurality of ports, a plurality of one-way directional valves, and a joint. Each port is adapted to receive and secure a syringe to allow for a flow of a liquid through the syringe into the port. Each one-way directional valve is in fluid communication with a respective port of the plurality of ports to enable the liquid to flow away from the port. The joint has a plurality of inputs to receive the flow from the plurality of one-way directional valves. The inputs are in fluid communication with each individual port of the plurality of ports. The joint has an output.

Abstract: A valve, insertable in a standard catheter, prevents undesired backflow of fluid and provides for blood samples to be taken through a standard catheter. This valve is a check valve having a housing with a check plate mounted therein.

Abstract: An IV manifold includes a plurality of injection/aspiration ports including a needleless access port (NAC). A check valve included in the manifold is generally located at an upstream end of the manifold. However, the check valve may alternatively be located between injection ports. An aspiration port can be formed with a second seal disposed on the side of the valve element opposite a first seal. Two-way aspiration can be provided by a valve having a cage with or without compressible characteristics to accommodate low tolerance fittings. Alternatively, two way aspiration can be provided by the NAC having a single elongate valve element including a plug at one end. The elongate valve element has properties for resiliently and sealingly biasing the plug into an aperture of the NAC. In use the Plug is mechanically displaced by insertion of a male Luer for injection or aspiration.

Abstract: Disclosed are improved catheter slit valves for medical fluid infusion and aspiration. The improved catheter slit valves use nonradial slits to address the problems found with conventional radial slit valves. The improved catheter slit valves also use radial and nonradial slits in combination with each other, protuberances, and caps to enhance the operation of the valves. Also disclosed are catheters with multiple slit valves, compound slit valves, multiple lumens, or combinations thereof. The catheters disclosed are made of biocompatible materials, such as polyurethanes, silicones, polyethylenes, nylons, polyesters, and polyester elastomers.

Abstract: A low-pressure fluid flow control magnetic valve (cycler) device, system and method for use emptying the contents of bladder by a catheter. The device can be connected with a specified drainage tubing to function as a hydrodynamically balanced system (to empty into a typical two-liter collection bag). The cycler can be connected externally to a urinary catheter for hospital, clinical and home-care use for the emptying of the bladder of a patient through a catheter in a biologically more natural, filling and draining, cyclic manner. Fully automatic, modes of operation are provided for opening and closing this valve to empty the bladder of urine when appropriate or necessary. The modes of operation respond to normal human (or animal) body pressures, or are automatic with a manual override. This device is U.S.F.D.A. approved for human use and responds to normal human (or animal) body pressures to assist the detrusor muscle to function normally in spite of an indwelling catheter challenge.

Abstract: A fluid delivery system includes a valve device, a pump system operable to pressurize a fluid and a patient interface. The valve device includes a sealing element and defines at least a first outlet and a second outlet. The first outlet includes a first member of a connector. The pump system is operably associated with the second outlet of the valve device. The patient interface includes a second member of the connector and a tube in fluid connection with the second member. The second member of the connector is adapted to be removably connected to the first member of the connector. The first member preferably includes a resilient septum, and the second member preferably includes a penetrating member.

Abstract: An autoinflating catheter and balloon assembly having an autoregulating structure to prevent overinflation of the balloon as a result of variable fluid flow rates through the catheter lumen. A tight-fitting elastomeric balloon is provided on the distal end of the catheter body, and the assembly is constructed so that at least a portion of the fluid flow through the lumen is directed to the balloon to inflate it. As the balloon is inflated, more and more of the fluid flow through the catheter is discharged from the catheter, thereby preventing overinflation of the balloon.

Abstract: An aseptic connector comprises a first member and a second member. The first member preferably includes a resilient septum, and the second member preferably includes a penetrating member. Preferably, the septum is formed from an elastomeric material such as a silicone elastomer. The penetrating member preferably includes an extending penetrating element to penetrate the resilient septum. The aseptic connector further comprises a resilient sealing element that contacts the penetrating member and one of an inner wall of the first member and an inner wall of the second member to create a seal between the penetrating member and one of the inner wall of the first member and the inner wall of the second member. The seal created is suitable to withstand relatively high pressures (for example, those experienced during the injection of contrast media in CT procedures). A fluid delivery system comprising at least a first aseptic connector as described above is also provided.

Abstract: A catheter for intravascular corporeal cooling comprises an elongated tubular member having at least one lumen extending therethrough for providing cooled blood, an inflatable annular balloon positioned on the outer surface of the elongated tubular member, and a pressure reliever positioned in the external wall of the elongated tubular member and proximal to the annular inflatable balloon, wherein when the pressure of blood within a lumen reaches a predetermined value, the pressure reliever opens to permit fluid to be released from the elongated tubular member. In other embodiments of the invention the catheter may have two or more inflatable annular balloons that are separately inflatable and/or the catheter has an insulative outer annular member.

Abstract: In an embodiment, a slit valve catheter has a generally tubular catheter body with an exterior surface exposed to an environment and an interior surface defining a lumen. The catheter further includes a valve which has a protuberance projecting radially from the catheter body.

Abstract: A system for controlling fluid flow through multiple conduits for use in a fluid administration device. The system includes a housing, a cam, and a control element used to move the cam to selectively occlude the conduits. When used with a medical burette, the cam is located between the vent and supply conduits and rotates to alternately occlude one or the other conduits or to leave both conduits patent. A cam lobe occludes the conduits by pressing the conduit against a pressure surface until occlusion is obtained. Depending on the rotational position of the cam, the continuous flow mode, the intermittent flow mode, and the priming mode are all obtained with a single control lever. The housing secures the conduits in predetermined, fixed positions both above and below the contact location of the cam to the conduit. A positive locking device is included to assist in locating the cam in the desired position.

Abstract: The present invention is a continuous irrigation system for medical applications, including transurethral resection procedures, which provides automatic bag switching. It includes: (a) a first and second liquid irrigation bag; (b) a first proximal tubing and a second proximal tubing extending from the first liquid irrigation bag and the second liquid irrigation bag, respectively, and (c) a control valve device. The control valve device includes: (i) a main housing having a hollow body and a top and a bottom; (ii) an outlet located on and extending downwardly from the bottom for attachment of distal delivery tubing thereto; (iii) two inlets, located on or near the top of the main housing for the first and second proximal tubing; (iv) a floatation valve for opening and closing the second inlet. There is a distal delivery tubing connected to the outlet.

Abstract: An apparatus for regulating flow of an inflation fluid to a stent delivery balloon. A valve, which is situated in the flow path of the inflation lumen, regulates the flow of liquid used to inflate and deflate the balloon. The valve performs to restrict flow and to respond to pressure applied to assure a desired inflation rate when fluid is flowing toward the delivery balloon. On deflation, when fluid is flowing away from the delivery balloon, the valve is designed to offer little or no resistance, allowing the balloon to be deflated quickly.

Abstract: A method and device for the pharmacological cardioversion of fibrillation or atrial flutter is disclosed. The device is implantable in the human body and provides equipment for drug infusion using an electrocatheter positioned in the right atrium, the right ventricle, or the coronary sinus. The electrocatheter is provided with sensors which monitor the electromechanical activity of the heart and which intervene to activate the infusion in the presence of fibrillation or flutter. The catheter may be provided with at least one balloon which can be inflated and deflated to create a chamber which permits perfusion of the drug directly into the vein of Marshall.

Abstract: An anti-siphon valve for medical infusion lines and the like comprises a diaphragm made of elastic material interposed between one first tubular connector and one second tubular connector, and co-operating with an annular valve seat to keep the anti-siphon valve normally closed. The diaphragm consists of the bottom wall of a cup-shaped element, the external peripheral edge of which is normally kept pressed in fluid-tight contact against the annular valve seat under the axial thrust exerted by the side wall of the cup element.

Abstract: A valve has a flow restrictor positioned outside of a lumen of a tube, which transitions between an open configuration and a closed configuration. The valve further contains a closing mechanism that automatically positions the flow restrictor to the closed configuration when a pressure in a fluid within the lumen is below a low threshold pressure, and an opening mechanism that automatically positions the first flow restrictor to the open configuration when the pressure in the fluid within the lumen is above a high threshold pressure that is higher than the low threshold pressure. The flow restrictor is preferably positioned outside the tube, although it may be positioned inside the wall of the tube, or even within the lumen of the tube. There may also be a second, downstream flow restrictor. The opening and closing mechanisms advantageously comprise a magnet or solenoid. The tube may comprise a catheter, and especially a urinary catheter.

Abstract: A device cooperating with a pump for guiding a contrast medium from a source thereof to a catheter for delivery to a patient's vascular system. The device comprises a dual check valve, a tubular member, an in-line check valve and a three-port stopcock. The dual check valve has an inlet port connectable to the source of contrast medium, an inlet-outlet port connectable to the pump, and an outlet port coupled to the tubular member. The in-line check valve is connected to the tubular member at a point spaced from the dual check valve for preventing fluid flow towards the dual check valve. The stopcock connected at a first port to the in-line check valve, a second port of the stopcock being operatively connectable to the catheter. Using this device, medical personnel infuses contrast medium into the patient from the source without having to disconnect any element from the device during the infusion process.