15 results about "Arterial cannula" patented technology

The utility model discloses an arterial cannula with a far-end perfusion side hole, and relates to the technical field of medical instruments. Comprising a first intubation tube and a second intubation tube, the lower end of the first intubation tube is connected with the upper end of the second intubation tube, the second intubation tube is a blood vessel built-in tube, a perfusion side hole is formed in the side wall of the second intubation tube, and a clamping mechanism is further arranged on the first intubation tube. The side wall of the first intubation tube is provided with the perfusion side hole, when lower limb ischemia of a patient occurs, the blood vessel does not need to be punctured again through a far-end perfusion tube, only blood needs to be supplemented into the blood vessel of the patient from the first intubation tube and the perfusion side hole box, pain and injury of the patient are greatly relieved, and operation is more convenient. Meanwhile, a clamping mechanism is arranged, so that the problem that the device is easy to loosen and fall off is effectively solved when the device is used.

The invention relates to the technical field of medical instruments, and provides an arterial cannula for VA-ECMO, a preparation method and a VA-ECMO system comprising the arterial cannula, the arterial cannula comprises a catheter provided with a liquid guide cavity, the catheter is connected with a guide conical head, a supporting spring is sleeved with the catheter, and a plurality of metal rings are arranged in the middle of the supporting spring close to the end of the guide conical head at intervals; at least one liquid outlet hole is formed in each metal ring and the side wall, corresponding to the metal pipe, of the guide pipe; a sealing plug is arranged between the guide conical head and the end of the supporting spring, the guide wire can pass through the sealing plug, and blood cannot pass through the sealing plug. The multiple metal rings are arranged in the middle of the supporting spring close to the guide conical head end at intervals, the rigidity of the position, provided with the liquid outlet hole, of the catheter is improved through the metal rings, and then machining of the liquid outlet hole of the catheter is facilitated; the supporting spring and the developing metal ring are matched to ensure that the outer-layer tube does not collapse during thermal shrinkage, and meanwhile the clinical usability of the arterial cannula is met.

The utility model discloses a novel in-vitro frog heart perfusion experiment device which comprises a vein cannula and an artery cannula, the top of the vein cannula is communicated with an input end, and the top of the artery cannula is communicated with an output end. The top of the output end is an n-shaped part; the liquid outlet of the output end is communicated with a hose extending into the input end; the output end is fixedly connected with a transverse fixing rod, a sliding ring matched with the transverse fixing rod is fixed to the input end, and the sliding ring is in threaded connection with a first fixing bolt. The transverse fixing rod is connected with a supporting frame. Hooks are fixed to the side faces of the input end and the output end, connecting ropes are fixed to the hooks in a binding mode, and the hooks are used for enhancing binding and fixing of the input end and the output end. The device can effectively prevent an in-vitro frog core from falling off in the experiment process, the distance between the input end and the output end can be adjusted according to the size of the in-vitro frog core, and the left-right position and the high-low position of the whole device can be conveniently adjusted according to needs.

The present disclosure describes, in part, arterial cannula systems for extracorporeal membrane oxygenation and cardiopulmonary bypass provides pulsatile blood flow and selective flow distribution. The cannula comprises a multi-lumen structure including a central lumen for blood flow, dedicated lumens for helium delivery, a distal orifice for body perfusion, and proximal orifices for limb perfusion. An inflatable cuff positioned between the distal and proximal orifices modulates blood flow through rapid inflation and deflation cycles achieved in milliseconds using helium gas. An external control console with microcontrollers and customized software automates the inflation-deflation cycles based on physiological inputs including ECG, arterial pressure, and tissue oxygenation. The system restores physiologically effective pulsatile flow, prevents limb ischemia, reduces thrombus formation risk, and can provide ECG-synchronized flow modulation to facilitate native cardiac ejection, potentially eliminating the need for separate left ventricular venting during mechanical circulatory support.

The constant-pressure perfusion device comprises a bottom plate, a first lead screw, a second lead screw and a third lead screw are arranged on the two sides of the top of the bottom plate and the rear end of the center of the bottom plate respectively, the tops of the first lead screw, the second lead screw and the third lead screw are all connected with adjusting knobs, and a lifting seat is arranged at the position, close to the top, of the surface of the first lead screw. A first lifting frame is in threaded connection with the top of the surface of the second lead screw, and a second lifting frame is in threaded connection with the bottom of the surface of the third lead screw. According to the constant-pressure perfusion device for improving the in-vitro frog heart, through the design of a first lead screw, a second lead screw, a third lead screw, a lifting seat, a first lifting frame, a second lifting frame, a guide rod and an adjusting knob, an experimenter can rotate the adjusting knob according to the thread transmission principle, so that the lifting seat and the first lifting frame move up and down along the lead screws; therefore, the purpose of accurately controlling the heights of the liquid storage bottle, the frog heart, the venous cannula and the arterial cannula is achieved, the adjusting mode is high in accuracy, and the experiment efficiency and accuracy are improved.

The utility model discloses an anti-falling ECMO arterial cannula with a far-end perfusion hole, and relates to the technical field of medical instruments. An operating cavity is formed in the inner side of the cannula body, an acting spring is arranged on the inner side of the operating cavity, a connecting ring is fixedly connected to the inner wall of the lower side of the operating cavity, the lower end of the acting spring is fixedly connected to the upper end of the connecting ring, the upper end of the acting spring abuts against the inner wall of the upper side of the operating cavity, and a plurality of pull ropes are fixedly connected to the upper end of the connecting ring. The end, away from the connecting ring, of the pull rope extends to the position above the operation cavity, penetrates through the side wall of the cannula body and extends to the outer side of the cannula body. During use, when the pull ropes are tightened, the acting spring is compressed, at the moment, the inner side wall of the operation cavity is in a natural state, the outer side wall of the operation cavity protrudes, the protruding outer side wall of the operation cavity is used for preventing the cannula body from falling off, and by means of the mode, discomfort cannot be brought to the skin of a patient; and meanwhile, the problem of infirm fixation caused by skin sweat of the patient is solved, so that the problem of release of the cannula main body is effectively solved.

The invention discloses a femoral artery cannula with a core, and relates to the technical field of medical instruments. The femoral artery cannula with the core comprises a cannula body, and a hollow inner cavity is formed in the cannula body. The puncture guide core is arranged in the hollow inner cavity in a penetrating manner; the sealing assembly comprises a sealing plate, a sealing piece and a springback assembly, the sealing plate is fixedly arranged in the hollow inner cavity, and the axial direction of the sealing plate is the same as that of the hollow inner cavity; a containing hole for containing the sealing pieces is formed in the center of the sealing plate in a penetrating mode, two moving grooves are formed in the inner wall of the containing hole, the number of the sealing pieces is two, the sealing pieces are movably arranged in the moving grooves, the moving direction of the sealing pieces is perpendicular to the axial direction of the sealing plate, and the rebound assembly is arranged between the two sealing pieces. The diameter of the placing hole is not smaller than that of the puncture guide core. According to the invention, the blood can be automatically prevented from splashing, so that the reliability of the cored femoral artery cannula for preventing the blood from splashing is improved.

The invention relates to a method for monitoring cardiac cycle synchronized extracorporeal circulation support and to a corresponding device and circulation support device, in particular for optimizing the provided support pulses. Accordingly, a method for monitoring cardiac cycle synchronized extracorporeal circulation support (12) of a patient is described, comprising the steps of: receiving a pressure value characterizing an aortic pressure of the supported patient; determining a first minimum pressure value (40) of the cardiac cycle of the patient and a first point in time of the minimum pressure value (40) from the pressure values; determining, from the pressure value, whether there is a reduced rate of change of pressure at a subsequent second point in time (42), the reduced rate of change of pressure lying between an immediately preceding greater rate of change of pressure and a subsequent greater rate of change of pressure; and outputting a signal as a function of the reduced rate of pressure change (42) present. The pressure value is received by a pressure sensor (32) arranged upstream of an arterial cannula (30) of an extracorporeal circulation support (12) and downstream of an oxygenator (28).

This utility model belongs to the field of experimental equipment technology, and discloses an ion monitoring device for a rabbit hepatic encephalopathy experimental model, including: an operating table with a monitoring system installed on it; the monitoring system includes a first base with a first fixing rod fixed in the center and two fixing clips on the first fixing rod; a tension transducer with its input end detachably connected to the fixing clips and a three-way valve detachably connected to the input end, with an endotracheal tube detachably connected to the three-way valve for monitoring respiratory rate; and a pressure transducer with its input end detachably connected to the fixing clip and a three-way valve detachably connected to the input end, with an arterial cannula detachably connected to the three-way valve for monitoring changes in arterial blood pressure, heart rate, and respiratory rate during the progression of rabbit hepatic encephalopathy (early, middle, progressive, and recovery phases), thereby increasing the scientific rigor and repeatability of the experimental operation.

The embodiment of the invention provides an organ perfusion system. The organ perfusion system comprises a pump, a venous cannula, an arterial cannula, a balloon driving device and a control device. The near end of the venous cannula and the near end of the arterial cannula are connected with a pump. The far end of the venous cannula is provided with a first opening and used for being inserted into tissue veins without blocking the tissue veins. The far end of the arterial cannula is provided with a balloon and a second opening, the second opening is located in the far end side of the balloon, and the far end of the arterial cannula is used for being inserted into a tissue artery. The control device is electrically connected with the pump and the balloon driving device. The control device is used for controlling the pump to operate so as to extract blood of tissue veins and inject the blood into tissue arteries; the control device is further used for controlling the balloon driving device to drive the balloon to expand so as to block the tissue artery when the blood is injected into the tissue artery, and controlling the balloon driving device to drive the balloon to contract so as to conduct the tissue artery after the blood is injected into the tissue artery. The organ perfusion system can perfuse organs to improve organ functions.

The utility model belongs to the technical field of medical instruments, and provides an arterial cannula for VA-ECMO, which comprises a cannula body provided with a liquid guide cavity, one end of the cannula body is provided with a liquid injection port communicated with the liquid guide cavity, and the other end of the cannula body is a closed end; the tube body comprises a main body part and an arch-shaped part which are connected, the liquid injection port is formed in the end part of the main body part, and the closed end is arranged at the end part of the arch-shaped part; the arch-shaped part is in a bent arch shape matched with the aortic arch and is provided with a liquid outlet hole communicated with the liquid guide cavity. According to the artery cannula for VA-ECMO, one end of the cannula body is arranged to be the closed end, and the blood flow direction is changed through the liquid outlet hole, so that reverse blood flow of VA-ECMO through the femoral artery cannula is reduced, the left ventricular afterload is reduced more easily and more easily, complications caused by afterload increase are reduced, and the survival rate of VA-ECMO treatment patients is increased.

The invention relates to the technical field of medical equipment, and provides an extracorporeal circulation cannula which comprises a cannula body. A first opening area is arranged at the position, away from the first end by a first distance, of the side wall of the cannula body, and a plurality of first side holes are formed in the first opening area. The first side holes are arranged in the side wall of the cannula body in an array mode. According to the intubation tube for extracorporeal circulation, the first end of the intubation tube body is inserted into the venous blood vessel and communicated with the venous blood vessel, and the second end of the intubation tube body is communicated with the external equipment, so that the intubation tube is matched with the external equipment and the arterial intubation tube to form a circulation loop, and blood is drained out of the body from the body; after being subjected to gas exchange by the membrane type oxygenator, the gas is transfused back into the body through the arterial cannula to temporarily replace the cardiopulmonary function, so that rescue treatment is provided for critical patients; meanwhile, the first side holes which are arranged in an array mode are formed in the position, close to the first end, of the cannula body, the first side holes can effectively improve the flow field near an outlet of the cannula, and the recirculation rate can be reduced easily.

The utility model discloses an arterial cannula for domestic rabbits, which comprises a circular-tube-shaped cannula body, an annular groove is formed at the front end of the cannula body, an annular air bag is sleeved in the annular groove, an air inlet tube communicated with the air bag is formed in the cannula body, and a one-way valve structure is mounted on the air inlet tube. The one-way valve structure comprises two oppositely-arranged membrane petal-shaped flexible elastic pieces. The outer ends of the two flap-shaped flexible elastic sheets are fixed on the inner wall of the air inlet pipe, and the inner ends of the two flap-shaped flexible elastic sheets are pressed against each other. The annular air bag is placed in the annular groove, obstruction of the air bag and damage to the artery when the cannula enters the artery are avoided, air leakage after the air bag is inflated is prevented through the air inlet pipe and the special one-way valve structure, and the air bag can be deflated quickly according to needs.

The present disclosure describes, in part, arterial cannula systems for extracorporeal membrane oxygenation and cardiopulmonary bypass provides pulsatile blood flow and selective flow distribution. The cannula comprises a multi-lumen structure including a central lumen for blood flow, dedicated lumens for helium delivery, a distal orifice for body perfusion, and proximal orifices for limb perfusion. An inflatable cuff positioned between the distal and proximal orifices modulates blood flow through rapid inflation and deflation cycles achieved in milliseconds using helium gas. An external control console with microcontrollers and customized software automates the inflation-deflation cycles based on physiological inputs including ECG, arterial pressure, and tissue oxygenation. The system restores physiologically effective pulsatile flow, prevents limb ischemia, reduces thrombus formation risk, and can provide ECG-synchronized flow modulation to facilitate native cardiac ejection, potentially eliminating the need for separate left ventricular venting during mechanical circulatory support.