69 results about "Air embolism" patented technology

A system is disclosed for preventing air from entering a first catheter or cannula of a multi-catheter system. Air is prevented from entering the proximal end of the first catheter by an axially elongate chamber having an impeller, the chamber being affixed to the proximal end of the first catheter. The first catheter is affixed at an offset location, near the periphery of the chamber. The impeller is driven by a motor drive and imparts rotational energy to the fluid within the chamber forcing any air within the chamber to migrate to the center of the chamber by buoyancy effects. The air is removed through a port near the centerline of the chamber. Liquid removed with the air is returned to the chamber to minimize liquid loss during the procedure. Hemostasis valves or seals can be provided at the entrance and the exit of the chamber. A second catheter inserted through the chamber and into the first catheter is unable to entrain gas into the first catheter because any gas that enters the chamber is routed to the centerline of the chamber where it is removed. The first catheter can be a cannula or an introduction sheath, devices suited for endovascular access into the mammalian cardiovascular system where pressures may fall below ambient room pressure, a condition, which could encourage the possibility of air embolism to a patient. Inflow of fluid from an external pump scrubs the second catheter shaft of air bubbles attached by surface tension.

A multifunction adaptor for an open-ended catheter that allows placement of the catheter while minimizing the risk of air embolism or blood loss through the open (proximal) end of the catheter body. In one variation, the design allows passage of a standard guidewire for “over-the-guidewire” placement techniques and a connection for catheter flushing using a standard syringe. In another variation, the multifunction adaptor is configured for coupling a tunneler to the proximal end of a catheter.

A valved connector for controlling the flow of fluid having a valve assembly positioned within a connector housing having a first position wherein the valve assembly prevents fluid flow through the connector housing, and a second position wherein the valve assembly permits fluid flow through the connector housing. The valve assembly may be movable from the first position to the second position by a male luer fitting. The valve assembly is configured for multiple and repeated access and also for minimizing fluid flow restrictions. The valved connector may be designed for use with a catheter to provide for “over the guidewire” placement or replacement techniques with little or no bleed-back or air embolism.

A multifunction adaptor for an open-ended catheter that allows placement of the catheter without risk of air embolism or blood loss through the open (proximal) end of the catheter body. The present design allows passage of a standard guidewire for “over the guidewire” placement techniques and a connection for catheter flushing using a standard syringe.

A valved catheter that allows placement and withdrawal of an accessing device or attachable unit without the risk of air embolism or blood loss. The valved catheter includes a catheter tube having a necked portion in its proximal end that forms an integral valve, the necked portion being surrounded by a compression sleeve that biases the valve in a closed position.

A multifunction adaptor for an open-ended catheter that allows placement of the catheter without risk of air embolism or blood loss through the open (proximal) end of the catheter body. The present design allows passage of a standard guidewire for “over the guidewire” placement techniques and a connection for catheter flushing using a standard syringe.

The present invention relates to an infusion set (10) that provides for continuous air free delivery of liquid to patients undergoing infusion procedures. In particular, the invention provides for an infusion set (10) that prevents air entering the infusion tubing (40) through the drip chamber (20) by using a hydrophilic membrane (21) having a defined wetting time and a defined mean pore size that will provide a defined bubble pressure point under gravitational pull to permit continuous air free infusion liquid flow there-through. The invention further provides for a clip (50) that once closed, no air bubble is able to pass through the hydrophilic membrane (21) due to the adjustment of the roller clamp (60) along the infusion tubing (40) thereby ensuring safe replacement of the infusion bottle during multiple infusion procedures, thus preventing the occurrence of air embolism in patients especially when the drip chamber (20) is empty.

A valved catheter that allows placement and withdrawal of an accessing device or attachable unit without the risk of air embolism or blood loss. In one variation, the valved catheter includes a catheter tube having a necked portion in its proximal end that forms an integral valve, the necked portion being surrounded by a compression sleeve that biases the valve in a closed position. In another variation, the valved catheter is a dual lumen catheter with a corresponding bifurcating extension for engaging the valves in the catheter in order to establish fluid communication through the catheter.

A method of reducing infections associated with vascular access procedures. A powder containment device (PCD) is preferably adhesively attached to a skin area, the PCD having a hole formed centrally therethrough adapted to completely surround the catheter wound site. The open cavity formed by the PCD being attached to the skin is filled with a hemostatic agent of a salt ferrate and an insoluble cation exchange material. The salt ferrate combines with blood to form a trivalent Fe+++ ion promoting blood clotting and producing oxygen at the wound site for bacteria reduction. The cation exchange material also forms a protective cover over the wound site as the trivalent Fe+++ ion is formed. Semi-occlusive pressure is applied against the hemostatic agent for a time sufficient to arrest blood flow from the wound site right after inserting or removing the catheter. The PCD and hemostatic agent are then covered with an adhesive dressing. The occurrence of air embolisms introduced around the catheter is also reduced after the hemostatic agent has interacted to arrest blood flow around the catheter.

The de-airing device for purifying blood has one box with water inlet, water outlet, air exhaust, dialysate joint and waste liquid joint. The water inlet is connected to the liquid inlet of the flow controlling choke; the liquid outlet of the flow controlling choke is connected to two pipelines, including the first pipeline connected to the liquid inlet of the first de-airing tank via a gear pump and the second pipeline connected to the liquid exhaust of the second de-airing tank via a second solenoid valve; the liquid outlet and the air exhaust of the first de-airing tank are connected separately to the dialysis joint and the air exhaust joint pipeline; and the liquid inlet and the liquid outlet of the second de-airing tank are connected separately to the waste liquid joint pipeline and the water outlet joint via a second gear pump. The present invention can avoid air embolism to blood for normal dialysis treatment.

The invention provides an air valve for use in getting air out of intravenous (IV) tubing and preventing the air from intravenous (IV) tubing from entering healthcare patients' veins. In an illustrative embodiment the air valve is attached at one end to the intravenous (IV) tubing that hangs from an intravenous (IV) bag and at the other end to the injection site, where a needle is inserted into a patient's vein. The invention prevents any air from entering a healthcare patient's blood stream and causing air embolism, a potentially lethal complication caused by an accumulation of air bubbles in the blood stream that hinders the circulation of blood. The invention will also lead to increased productivity of intravenous (IV) drips since it allows for a seamless interchange of medications and solutions.

A mechanical device with automatic reset capabilities that injects compressed air or other gases into the heart and lung cavities of Order Rodentia pest which results in death by delayed air embolism or cardiac arrest. This method allows the target time to vacate the premise saving time on carcass removal and clean up. This new technology can replace the poison bait traps and other environmental pollutants currently in use.

Disclosed is a transportable apparatus that maintains a large volume of a cold solution at a preset low temperature and rapidly delivers it to an irresuscitable patient's thoracic aorta at a preset and controlled flow rate, while monitoring pressure and eliminating the introduction of air embolisms into the patient, for the purpose of inducing profound hypothermia and suspended animation until proper treatment of the patient is available. The induction of suspended animation is intended for preservation of viability of the brain, heart, and organs for subsequent repair and resuscitation or for organ harvesting. The procedure may be performed by emergency personnel on the scene of an accident and / or while the patient is being transported in an emergency vehicle, or while in a hospital.

The present invention relates to the use of a catheter system for avoiding air embolisms in intracranial interventions and to the catheter system itself; the latter has a first and a second catheter main body, each with a longitudinal axis, a proximal end and a distal end. The catheter main bodies have several lumens and lumen openings and in each case an expandable structure for blocking the bloodstream in blood vessels.

Method and apparatus for preventing air embolisms during surgical procedures which involves providing a fluid source in communication with an aperture extending into an anatomical cavity such that fluid may be delivered into the cavity when a condition of negative pressure exists in the cavity, thereby preventing the introduction of air into the cavity.

The invention relates to a lumen stent which comprises a radially compressible inner-layer stent and an outer-layer stent. The inner-layer stent is of a tubular structure, and openings are formed in two ends of the tubular structure with the sealed middle; the outer-layer stent sleeves the inner-layer stent and at least partially covers the inner-layer stent, an end of the outer-layer stent is hermetically connected with the inner-layer stent, and a plurality of through holes are formed in the outer-layer stent and are particularly formed in locations close to joints of the outer-layer stent and the inner-layer stent. The lumen stent has the advantages that the through holes are formed in the outer-layer stent, accordingly, normal saline can flow into cavities enclosed by the outer-layer stent and the inner-layer stent along with the through holes after the lumen stent is arranged in delivery systems, air in the cavities can be completely expelled, and risks of air embolism can be prevented after the lumen stent is implanted into bodies.

The invention relates to a disposable medical safe infusion apparatus, which is capable of automatically sounding an alarm when the liquid medicine in an infusion bottle is nearly running out, and automatically closing an infusion catheter when the liquid medicine drops to the bottom of a Murphy pipette, so as to stop the liquid medicine to further flow downwards. The medical safe infusion apparatus is characterized in that: an alarm is arranged on a puncture outfit in order to give an alarm when the liquid medicine is running out; a needle valve able to suspend in the liquid medicine is arranged inside the Murphy pipette, so that the infusion catheter can be automatically closed when the liquid flows to the bottom of the pipette, so as to prevent the liquid from dropping and protect the patients from the dangers of blood backflow and air embolism.

The invention discloses an absorbable iron alloy stent, comprising an iron alloy substrate and a degradable polymer in contact with the surface of the substrate, in which the degradable polymer has a weight average molecular weight of more than or equal to 20,000 and less than or equal to 1,000,000 and a polydispersity index of more than 1.0 and less than or equal to 50. After the iron alloy stent is implanted into the body, the degradable polymer degrades to produce a carboxyl group. After the degradable stent is implanted into the human body, the effects of oxygen-consuming corrosion enable the stent both to mainly function as a mechanical support and then to degrade gradually, and the amount of hydrogen produced in the degradation process does not reach the level that can lead to a risk of air embolism.

The invention discloses an infusion alarm device capable of automatically prompting when infusion completes. The infusion alarm device comprises an infusion hanging box, and is characterized in that a spring for infusion hanging is fixedly mounted in the infusion hanging box, a metal sheet is connected to the lower end of the spring, one side of the metal sheet extends to form a contact piece, and a capacity position selection switch, namely an infusion alarm switch, which is can be adjusted up and down, is mounted on the side face of the infusion hanging box; a control box is arranged in the infusion hanging box and is connected with the contact piece and the infusion alarm switch through wires, and a power switch, a power light and a buzzer are arranged in the control box. The infusion alarm device capable of automatically prompting when infusion completes has the advantages that the situation that an infusion bottle is empty during infusion can be prevented, or air can be prevented from entering a blood vessel to result in air embolism by timely discovering that the air enters the infusion tube; the infusion alarm device is capable of reducing burden of accompanied personnel or medical personnel.

The invention relates to a fixing device capable of precisely feeding a catheter during surgery and a working method thereof, and belongs to the field of medical instruments. The fixing device comprises a base, guiding holes are formed in the base, the guiding holes are internally matched with guiding rods, a shelf is fixed to the tops of the guiding rods, a lifting air bag is arranged between theshelf and the base and connected with a power air bag through an air guiding pipe, a one-way valve is arranged on the joint of the lifting air bag and the air guiding pipe, an air releasing valve isarranged on the lifting air bag, stopping blocks are fixed to the bottoms of the guiding rods, the guiding rods are sleeved with lifting springs, and the lifting springs are located between the stopping blocks and the base. By means of the fixing device, the catheter can be properly lifted up according to the surgical condition, so that air is prevented from entering a human body to cause air embolism; the catheter can be quantificationally and precisely fed according to the surgical condition, so that the surgical effect is guaranteed.

The invention discloses a balloon micro catheter, and belongs to the technical field of medical instruments. The balloon micro catheter comprises a catheter body, a balloon, a developing ring, a catheter base, a first extension tube, a second extension tube and a filling connector; the catheter body is composed of an outer tube and an inner tube which are coaxial, an inner cavity of the catheter body is a wire guide cavity, a reinforcing rib structure on the catheter body divides an annular hole channel between the inner tube and the outer tube into a first filling cavity and a second filling cavity, and the developing ring is fixedly connected to the catheter body; and the balloon is fixedly connected to the far end of the catheter body, and an inner cavity of the balloon communicates with the first filling cavity and the second filling cavity. The balloon micro catheter has the advantages that: when the balloon is prepared before an operation, the exhaust is simpler and more thorough, the preoperative preparation time is shortened, and the problem of poor developing effect of an air embolism or the balloon is avoided; the problem of bending of the balloon and the inner tube is solved, and the risk of excessive embolism caused by the banana effect is reduced; and the balloon with a blocked filling channel can retract under relatively low negative pressure, the retraction process of the balloon is accelerated, and the accident rate is reduced.

The invention discloses a tearable sheathing canal, which comprises a round pipe, wherein the round pipe comprises two semi-cylindrical pipes symmetrical along the axis of the round pipe; the two semi-cylindrical pipes are matched by a heat sealing line; one opening end of the round pipe is sealed with an elastic membrane; the elastic membrane is provided with a through hole; and the round pipe is made of plastic. The tearable sheathing canal has the following beneficial effects that the sealing elastic membrane on the tail end of the sheathing canal can be used for effectively preventing air from entering a venous system because of negative pressure to cause complications such as pulmonary embolism when a patient inhales in the process that the tearable sheathing canal is sent into the venous system of the human body along a puncturing guide wire; when the tearable sheathing canal is sent into the venous system of the human body, possible air bubbles or thrombus in the sheathing canal can be sucked by a side pipe on the tail end of the sheathing canal, and anticoagulation heparin saline is injected; and when the a pace-making electrode conduit is conveyed to the venous system by the sheathing canal, the sealing elastic membrane on the tail end of the sheathing canal can be used for effectively preventing the air from entering the venous system to cause air embolism along with the electrode conduit.

The invention relates to the technical field of an infusion apparatus, in particular to a safety valve used on an infusion apparatus. The infusion apparatus comprises an ebonite accessory and a soft gum base; wherein, the soft gum base is connected with the bottom of the ebonite accessory. The ebonite accessory comprises an ebonite accessory body and an ebonite accessory connection piece arranged at the lower end of the ebonite accessory body; the soft gum base is provided with a soft gum base connection piece which is matched and connected with the ebonite accessory connection piece. The safety valve with a simple structure is arranged in the infusion apparatus; through air pressure and liquid attraction, the safety valve can effectively close the infusion apparatus after the infusion, thus effectively preventing blood reflowing during infusion, which leads to air embolism and thrombus. In this way, medical negligence can be reduced to the large extent, simultaneously medical contamination and cross infection can be effectively avoided and medical disputes between medical staff and patients are reduced.

The invention discloses an intelligent pipeline liquid monitoring clamp with a wireless transmitting device, in particular an intelligent pipeline liquid monitoring clamp for venous transfusion. The intelligent pipeline liquid monitoring clamp comprises a clamp capable of clamping a pipeline, a PCB embedded into the clamp and a handheld receiving end for receiving wireless signals; the circuit board is provided with an MCU singlechip, an infrared transmitting and receiving device, a wireless communication module, a buzzer driver and a master control program module; the MCU singlechip is connected with the infrared transmitting and receiving device through pins RA0 and RA2, connected with the wireless communication module through pins RC0, RC1 and RC2 and connected with the buzzer driver through a pin OSC2; the handheld receiving end is connected with the wireless communication module through the wireless signals; and the master control program module is arranged in an ROM zone of the MCU singlechip. The intelligent pipeline liquid monitoring clamp can monitor intravenous drip of a transfusion state in real time. A nurse, a patient or an accompanier does not need to pay close attention to transfusion surplus at every moment, and the emptying phenomenon of venous transfusion and even air embolism accident are avoided.