154 results about "Thrombus aspiration" patented technology

The invention discloses a thrombus excision system. An embolus is extracted through a mechanical embolus extraction device, a blood vessel is dredged, and revascularization of the blood vessel is achieved. A saccule guide catheter is put at the near end of the embolus part when the embolus is extracted, blood flow is temporarily blocked, and thus a fine crushed embolus generated in the embolus extraction process is prevented from being flushed to the far end of the blood vessel; meanwhile, for a relatively large embolus, a part of thrombus can also be sucked by virtue of the saccule guide catheter, and then the residual thrombus can be extracted by virtue of a thrombus exsector. The thrombus exsector, the saccule guide catheter and a delivery microcatheter are arranged on the thrombus excision system disclosed by the invention, wherein the thrombus exsector is used as a main component, an excision spring is arranged, and the release state of the excision spring is a conical spiral state. Compared with the prior art, the thrombus excision system has the advantages that the thrombus exsector is very soft, the minimal through size is 0.014' (0.36mm), the thrombus exsector can easily enter a cerebral vessel, a near-end protection technology is adopted in the operation process, and thrombus suction is combined with mechanical embolus extraction, so that the success rate of the operation is improved, and the complications are reduced.

Systems and methods include positioning of a catheter lumen in a first position with respect to a thrombus, the catheter lumen defined by a catheter, initiating of evacuation of a tubing lumen, where the tubing lumen is not in fluid communication with the catheter lumen, determination that a pressure within the tubing lumen is equal to or less than a target aspiration pressure, and, in response to the determination that the pressure within the tubing lumen is equal to or less than a target aspiration pressure, automatic establishment of fluid communication between the tubing lumen and the catheter lumen.

The invention provides a thrombus aspiration catheter with a flow monitoring function. The device comprises a suction tube body, a suction handle, an ultrasonic flow sensing assembly, a processing unit and a display module, the ultrasonic flow sensing assembly is arranged at the far end of the suction pipe body and used for monitoring a blood flow signal at a suction opening of the suction pipe body. The processing unit is electrically connected with the ultrasonic flow sensing assembly and is used for processing the blood flow signal and calculating to obtain suction indication information; the display module is connected with the processing unit and is used for displaying the suction indication information; the suction indication information comprises blood flow information. Therefore, the blood flow near the suction port of the suction catheter can be obtained through monitoring of the ultrasonic flowmeter, whether the suction port is aligned with the thrombus or not and whether the thrombus is sucked into the catheter or not can be judged in an auxiliary mode, the thrombus can be sucked more accurately without unnecessarily drawing out blood, blood loss of a patient is reduced, meanwhile, the suction efficiency is improved, and the blood taking time is shortened. The treatment effect is improved.

The invention discloses an intracranial thrombus aspiration catheter and a preparation method thereof, and belongs to the technical field of medical instruments, the catheter comprises a PTFE lining, a reinforcing layer (including a coil layer and a braid layer), an outer plastic layer designed in a segmented manner, a platinum-iridium alloy developing ring and a coating. The preparation method comprises the steps of PTFE lining extrusion, coil winding, braid layer covering, segmented plastic layer forming, developing ring embedding and fixing and coating treatment and surface functionalization. Compared with the prior art, by optimizing the formula and process of the coating, the adhesive force of the coating is remarkably improved, falling is prevented, meanwhile, the surface hydrophilicity is enhanced, thrombus adhesion is reduced, and blood compatibility and operation performance are improved. In addition, the flexibility, the kink resistance and the collapse resistance of the catheter are improved through the multi-layer structural design, and the stability and the effectiveness of the catheter in a complex blood vessel environment are ensured.

The invention provides a thrombus aspiration catheter with the variable inner diameter of the far end, and belongs to the technical field of interventional surgical instruments.The catheter comprises an interventional catheter, an operating handle and a collecting component, and the interventional catheter is used for moving along a blood vessel to be close to the thrombus position; the operating handle is arranged at the near end of the interventional catheter and is used for providing suction force for the interventional catheter; the collecting part is arranged at the far end of the interventional catheter, the near end of the collecting part is communicated with the interventional catheter, and the far end is open and adjustable in diameter; when the interventional catheter moves along the blood vessel to be close to the thrombus, the diameter of the collecting part is in a contracted state and is not larger than that of the interventional catheter, and after the collecting part is in place, the collecting part expands to increase the diameter of the far end so as to integrally suck the thrombus; the thrombus aspiration catheter is mainly used for solving the technical problems that in the prior art, a small-caliber thrombus aspiration catheter is insufficient in aspiration force, repeated aspiration is needed, thrombus escape is easily caused, and a large-caliber catheter is poor in passing ability and difficult to reach a diseased region.

The utility model discloses a thrombus aspiration plugging sheath system based on a special-shaped cavity, which comprises a vacuum device, an aspiration plugging sheath, an aspiration plugging sheath and an aspiration plugging sheath, and is characterized in that the vacuum device comprises a negative pressure needle cylinder and a piston buckle arranged on the side wall of the negative pressure needle cylinder; the balloon sheath tube comprises a tube body, a balloon used for blocking is arranged at the far end of the tube body, a connector connected with the vacuum device is arranged on the side of the near end of the tube body in a supporting mode, and a plurality of special-shaped cavities are formed in the tube body; the thrombus dragging instrument is used for blocking blood flow to reduce blood loss during thrombus suction and intercepting the thrombus to prevent the thrombus from escaping when the thrombus is dragged; the vacuum device is arranged on the side branch of the near end of the balloon sheath tube, and the thrombus dragging instrument is arranged in the balloon sheath tube. According to the embodiment of the utility model, the balloon filling opening and the thrombus suction opening are formed in the catheter body, a multi-cavity structure is adopted, the balloon sheathing canal blocks blood flow, and the thrombus dragging instrument is matched with a vacuum device to suck, drag and take out thrombus.

The invention discloses a peristaltic thrombus breaking and moving suction catheter and a using method thereof, and relates to the technical field of interventional medical instruments.The peristaltic thrombus breaking and moving suction catheter comprises a catheter body, the catheter body comprises a suction channel and an adjusting channel, and the adjusting channel is adjacent to the suction channel; the adjusting channel is provided with the peristaltic structure, the peristaltic structure comprises a plurality of adjusting sections arranged in the axial direction of the catheter body, the expansion degree between the two ends of each adjusting section is adjustable, during thrombus aspiration, the intermittent adjusting sections extrude the aspiration channel during expansion, and the parts, with the maximum expansion degree, of every two adjacent adjusting sections are not adjacent; the adjusting section enables part of the channel wall of the suction channel to be provided with a corrugated structure in the axial direction. And when the expansion degree of the adjusting section is adjusted every time, the positions, with the maximum expansion degree, of the adjusting section are different, so that the channel wall of the suction channel forms dynamic corrugated movement (namely similar to gastrointestinal peristalsis surface movement), and the thrombus carrying power is enhanced.

The invention provides a thrombus aspiration catheter. The thrombus aspiration catheter comprises an inner tube, an inner tube handle, an outer tube and an outer tube handle, the far end of the outer tube is provided with a conical head capable of being elastically opened, the conical head is in a sealed state in a natural state, suction side holes are formed in the peripheral wall of the far end of the outer tube, and the near end of the outer tube is connected with an outer tube handle. The inner tube is movably arranged in the outer tube in a penetrating mode, the far end of the inner tube can eject open and penetrate out of the conical head, the conical head and the inner tube are elastically sealed, the near end of the inner tube extends out of the near end of the outer tube handle and is connected with the inner tube handle, the inner tube handle is provided with a negative pressure source connecting assembly, and the inner tube handle is provided with an adjustable sealing valve. A sealed aspiration channel is formed within the inner tube and an instrument is sealed therethrough. Therefore, aspiration of thrombus in different directions, especially adherent and centered thrombus can be conveniently achieved, the aspiration ports in different directions are convenient and rapid to switch, and the thrombus aspiration efficiency and the thrombus extraction effect can be improved.

The present disclosure relates generally to thrombectomy devices. An exemplary catheter comprises: an emitter assembly comprising at least one emitter; wherein each emitter comprises an electrode pair, and wherein each emitter is configured to generate a plurality of cavitation bubbles when a voltage is applied to the pair of electrodes; an infusion lumen formed by at least a portion of an outer wall of the catheter, the infusion lumen configured to receive a conductive fluid, wherein the emitter assembly is housed within the infusion lumen, wherein a distal segment of the infusion lumen includes a plurality of holes on the portion of the outer wall of the catheter, and wherein the plurality of holes are configured to release the conductive fluid and the plurality of cavitation bubbles out of the catheter to treat thrombus at a treatment site; an aspiration lumen including aspiration ports at the distal segment thereof.

The utility model provides an intravascular thrombus aspiration catheter. The intravascular thrombus aspiration catheter comprises an internal flow channel, a far-end aspiration catheter section, a middle catheter section and a near-end driving catheter section, and the internal flow channel is sequentially communicated with the far-end aspiration catheter section, the middle catheter section and the near-end driving catheter section from the far end of the intravascular thrombus aspiration catheter to the near end of the intravascular thrombus aspiration catheter. Wherein the intravascular thrombus aspiration catheter further comprises an aspiration inlet and an outflow window, and the internal flow channel is communicated with the aspiration inlet and the outflow window; the inner flow channel is provided with an impeller; a suction inlet, an impeller and an outflow window are sequentially arranged from the far end to the near end of the intravascular thrombus suction catheter, and the intravascular thrombus suction catheter further comprises a filter screen. The filter screen is arranged between the impeller of the inner flow channel and the outflow window, or the filter screen is arranged outside the outflow window and wraps the outflow window. According to the intravascular thrombus aspiration catheter, the working load of the impeller can be effectively reduced, and then adverse events caused by excessive heat generated due to large load are reduced.

The present disclosure relates generally to thrombectomy devices. An exemplary catheter comprises: an emitter assembly comprising at least one emitter; wherein each emitter comprises an electrode pair, and wherein each emitter is configured to generate a plurality of cavitation bubbles when a voltage is applied to the pair of electrodes; an infusion lumen formed by at least a portion of an outer wall of the catheter, the infusion lumen configured to receive a conductive fluid, wherein the emitter assembly is housed within the infusion lumen, wherein a distal segment of the infusion lumen includes a plurality of holes on the portion of the outer wall of the catheter, and wherein the plurality of holes are configured to release the conductive fluid and the plurality of cavitation bubbles out of the catheter to treat thrombus at a treatment site; an aspiration lumen including aspiration ports at the distal segment thereof.

Disclosed herein are devices, systems, and methods for at least partially automatically aspirating clot material and blood from the vasculature of a patient, filtering the blood from the clot material, and returning the blood to the vasculature of the patient. In some embodiments, a system in accordance with the present technology can include (i) an aspiration catheter configured to be positioned within the vasculature of a patient proximate to clot material therein, (ii) an aspiration assembly selectively fluidly couplable to the aspiration catheter, (iii) a filter assembly selectively fluidly couplable to the aspiration assembly, (iv) a reinfusion and flushing assembly selectively fluidly couplable to the filter assembly, (v) a reinfusion catheter selectively fluidly couplable to the reinfusion and flushing assembly and configured to be positioned within the vasculature, and (vi) a control system communicatively coupled to the aspiration assembly, the filter assembly, and / or the reinfusion and flushing assembly.

The embodiment of the invention provides an expansion catheter device. The dilation catheter device comprises a catheter body assembly and a balloon body assembly. The pipe body assembly comprises a first pipe body and a second pipe body which extend in the same axial direction and can move relative to the axial direction. The second pipe body penetrates through the first pipe body. The balloon body assembly comprises an expansion balloon body and an interception balloon body which are arranged at the far end of the second tube body at an interval; the expansion bag body and the interception bag body are arranged in an expandable or contractible mode. Wherein the expansion bag body and the interception bag body are used for inputting filler to expand when the bag body assembly is exposed out of the first tube body along with relative axial movement, and a thrombus interception space is defined by the expansion bag body and the interception bag body and the blood vessel wall, so that at least part of thrombus extruded by the expansion bag body enters the thrombus interception space; and the first tube body enters the thrombus interception space to perform thrombus suction action. The expanded intercepting capsule body can intercept part of thrombus which falls off due to extrusion, and the thrombus is prevented from flowing to the far end of a blood vessel and causing embolism; and the first tube body can also suck the intercepted part of thrombus out of the body.

The application discloses a kind of thrombus suction control method and thrombus suction device, and thrombus suction device includes suction assembly, suction assembly includes the shell with pressure cavity, piston rod and suction catheter, thrombus suction device also includes the motor of piston rod movement and the controller connected with motor, control method is: suction catheter is positioned to the blood vessel without thrombus, make motor operate according to speed V0, calibrate the pressure value B in pressure cavity under normal blood condition;Suction catheter is positioned to the blood vessel with thrombus, make motor operate according to speed V1, V1≤V0, make dynamic pressure value A0 in pressure cavity: when A0≤B, make motor keep speed V1 operation;When A0>B, make motor increase from speed V1: when B<A0≤C, make motor increase to speed V2 operation;When C<A0≤D, make motor increase to speed V3 operation;When D<A0≤E, make motor increase to speed V4 operation.The control method thrombus removal efficiency is high, and blood loss can be reduced.

The utility model relates to a thrombus aspiration device, which belongs to the technical field of medical instruments, and comprises a piston rod, an injector empty cylinder and a clamping limit piece, the piston rod comprises a fan blade and a piston arranged at the end part of the fan blade, the piston is arranged in the injector empty cylinder, a plurality of grooves are arranged on the fan blade, and the clamping limit piece is arranged on the fan blade. A groove is formed in the injector hollow cylinder, the clamping limiting piece is located outside the injector hollow cylinder and clamped in the groove, an injection head communicated with the injector hollow cylinder is arranged at the end of the injector hollow cylinder, the injection head is connected with a suction catheter through a Luer connector, and a pressure monitoring assembly is arranged on the injection head. The real-time pressure in the injector in the thrombus suction process can be read by arranging the pressure gauge, and whether the suction catheter makes contact with the thrombus or not can be judged in an auxiliary mode. The thrombus suction device can visually monitor the negative pressure in the injector, and thrombus at the head end of the catheter is prevented from falling off due to insufficient negative pressure when the suction catheter is withdrawn.

The thrombus aspiration catheter comprises a catheter body and a deformation structure, and the deformation structure comprises a plurality of supporting rings and deformation assemblies arranged between every two adjacent supporting rings; when the axial distance between every two adjacent supporting rings is reduced, the deformation assembly deforms inwards in the radial direction, and the deformation assembly and the two adjacent supporting rings jointly form a variable-diameter channel with the inner diameter firstly decreasing and then increasing from far to near. When the axial distance between every two adjacent supporting rings is increased, the deformation assemblies deform and recover in the radial direction, and the minimum inner diameter of a channel formed by the deformation assemblies and the two adjacent supporting rings is correspondingly increased. The variable-diameter channel can form mechanical wrapping and clamping on the thrombus at the position with the minimum inner diameter, and thrombus escape or far-end embolism in the suction process is effectively prevented; meanwhile, the structure is beneficial for forming a negative pressure enhancing cavity at the far end of the catheter body, and stable grasping and concentrated efficient suction of the thrombus are achieved.

A thrombus suction negative pressure suction device comprises an injection needle tube, a piston is arranged in the injection needle tube in a sliding mode, the head end of the injection needle tube is connected with a connecting sleeve, the head end of the injection needle tube is connected with symmetrically-distributed air outlet tubes, a limiting frame is arranged in each air outlet tube, an air blocking plate is arranged on each limiting frame in a sliding mode, and the air blocking plates are connected with the connecting sleeves in a sliding mode. The air blocking plate is used for sealing the air outlet pipe, the air blocking plate is sleeved with a first elastic piece, and a first ball valve is arranged in the connecting sleeve. By arranging the liquid storage tube on the injection needle tube, a urokinase solution can be directly injected into the suction catheter without additionally using a three-way valve, the overall operation is simpler, and the injection needle tube and the suction catheter can be blocked through the first ball valve, so that the injection needle tube and the suction catheter can be independently operated; and the injection needle tube can exhaust internal air through the air blocking plate, negative pressure is achieved, air is prevented from entering the suction catheter, and therefore it is guaranteed that the suction catheter is in a stable negative pressure state.

The liquid storage tank comprises a tank body and a tank cover, the tank cover is installed at the top of the tank body, a liquid inlet and an air outlet are formed in the top of the tank cover, a floating support is installed at the bottom of the tank cover and located below the air outlet, a floating groove is formed in the floating support, and a liquid outlet is formed in the floating groove. The floating groove is communicated with the air outlet, and a buoy is installed in the floating groove in a sliding mode. According to the blood storage tank, the air outlet is connected with an external thrombus suction pump, the liquid inlet is connected with an external matched thrombus suction catheter, the other end of the thrombus suction catheter is inserted into a blood vessel of a human body, and the end of the thrombus suction catheter reaches the thrombus. The buoyancy of the blood can enable the buoy to move upwards, so that the buoy blocks the air outlet, the blood can be prevented from entering a pump connected with the liquid storage tank through the air outlet, and the pump is prevented from being damaged due to the fact that liquid enters the pump.

The present invention discloses a track-type mechanical thrombus aspiration catheter, which belongs to the technical field of vascular interventional medical devices. It includes a suction catheter, in which a transmission shaft and an eccentric metal head are arranged; a metal connecting tube is arranged at the distal end of the suction catheter; an eccentric metal head is connected to the distal end of the transmission shaft, the center of mass of the eccentric metal head deviates from the rotation axis of the transmission shaft, and the eccentric metal head is located in the metal connecting tube. The suction catheter adopts an eccentric metal head structure, and the eccentric metal head makes an eccentric cone swing at the distal end of the suction catheter, which can increase the suction area of ​​the suction port through the eccentric setting, improve the suction force of the suction port, and at the same time, the eccentric cone swing crushing structure crushes the large thrombus near the suction port, reduces the thrombus blockage near the suction port, improves the thrombus aspiration efficiency, reduces blood loss, and reduces the operation time.

The utility model discloses a Y-type connecting tube for thrombus aspiration, which relates to the technical field of medical appliances and comprises: a hose and a Y-type main tube, wherein the Y-type main tube has three independent joints, which are interconnected, wherein two joints extend upwards and the other joint extends downwards; the three independent joints are respectively used to connect different hoses, meet different use requirements and improve expansibility, avoid repeated plugging and unplugging, and avoid pollution caused by plugging and unplugging; the utility model also comprises: a connector, which is arranged above the Y-type main tube and between the hose and the Y-type main tube, and the connector can be connected to the hose and the Y-type main tube respectively; the three independent joints are respectively used to connect different hoses, meet different use requirements and improve expansibility, avoid repeated plugging and unplugging, and avoid pollution caused by plugging and unplugging; the arranged connector is used to connect the hose and the Y-type main tube, and the connector is provided with a butt tube and also has an external connection function.

The application provides a medical catheter, comprising: a catheter seat comprising a first communication interface and a second communication interface; a tube body, an inside of the tube body being provided with a suction channel and a liquid channel, a proximal end of the suction channel being in communication with the first communication interface, a distal end of the suction channel being open at a distal end of the tube body, a proximal end of the liquid channel being in communication with the second communication interface, and a distal end of the liquid channel being in communication with the distal end of the suction channel. By using the medical catheter, the thrombus suction efficiency is improved, and the medical catheter is suitable for removing thrombus of various shapes and textures.

Systems for use in blood clot removal can comprise a first tube, a second tube slidable within the first tube, and a self-expanding receiver having a membrane and positioned at least partially within the second tube. When the second tube and a proximal portion of the receiver are positioned within a distal end portion of the first tube and the second tube is moved proximally relative to the receiver until a distal end of the second tube is positioned proximally of a proximal end of the receiver, the proximal portion of the receiver can radially expand and make contact with the distal end portion of the first tube and a distal portion of the receiver can radially expand such that it has an inner diameter that is at least 10% larger than an inner diameter of the first tube.

The present invention relates to a thrombus aspiration catheter, comprising: an aspiration tube extending along an axis and having an aspiration port at a distal end; the guide wire tube is connected to the far-end side of the suction tube, the near-end side of the guide wire tube is fixed to the periphery of the suction tube, the part, overlapped with the suction tube, of the guide wire tube forms a connecting section, and the part, extending towards the far end, of the guide wire tube forms a suspended section; the flexural rigidity of the suction section and the flexural rigidity of the guide wire tube are both smaller than the flexural rigidity of the main body section; or the inner wall of the suction tube is provided with a sliding groove extending to the far end along the axis, the far end of the sliding groove is provided with a containing section, and the far end of the connecting rod is fixed to the near end of the guide wire tube. Through deformation of the guide wire tube or embedding of the guide wire tube into the tube wall of the suction tube, the guide wire can be used for guiding to quickly reach the preset position, the sectional area of the suction cavity of the suction tube is not damaged, and the suction efficiency and the pushing performance of the suction tube can be improved at the same time.

The present invention relates to the field of medical machinery, and provides a thrombus aspiration catheter, comprising: a catheter, one end of which is provided with a conical structure, the conical structure being provided with a suction port, and a connection port being provided on the tube wall of the catheter; a spiral structure being provided in the catheter; a mounting seat and a rotating wheel, the mounting seat being provided with a mounting hole, the rotating wheels being provided as a pair, the rotating wheels being rotatably mounted on the mounting seat, the mounting seat being provided with a channel connected to the mounting hole, and the outer wall of the mounting seat being provided with a through hole connected to the channel; four filaments, each of which is connected to one end of the catheter provided with the conical structure, each of which passes through the catheter, the mounting hole, the channel, and the through hole in sequence, and two opposing filaments being provided as a pair, each pair of filaments being wound in opposite directions on corresponding rotating wheels. By loosening or reeling the filaments on the rotating wheels, the filaments can pull the catheter, causing the catheter to bend, thereby achieving the effect of actively adjusting the forward direction of the catheter, eliminating the need for a guidewire, reducing the difficulty of operation, and shortening the operation time.

The invention discloses a self-adaptive aspiration system and method based on lumen state recognition, and relates to the field of thrombus aspiration, and the system comprises an air pressure sensor and an aspiration controller. The air pressure sensor is arranged in the suction catheter and used for collecting the air pressure value of the suction catheter in real time when the catheter cavity is sucked. The suction controller is connected with the air pressure sensor and the suction part and used for recognizing the state of the thrombus in the lumen according to the air pressure value of the suction catheter and adjusting the running state of the suction part according to the state of the thrombus in the lumen so that the thrombus in the lumen can be sucked through the suction catheter. The thrombus in the lumen can be sucked in a self-adaptive mode according to the state of the thrombus in the lumen, the thrombus suction efficiency is improved, the problem that when pure blood exists in the lumen, continuous suction causes a large amount of blood loss is avoided, and the thrombus suction safety is improved.

The invention relates to the technical field of medical instruments, and discloses a blood vessel intracavity plaque rotary cutting and thrombus aspiration integrated device which comprises a guiding tube and a rotary cutting tube, the rotary cutting tube abuts against the lower portion of the guiding tube, and a connecting mechanism is arranged between the ends, close to each other, of the guiding tube and the rotary cutting tube. The guiding pipe and the rotary cutting pipe are in limiting connection through a connecting mechanism, a miniature double-shaft motor is installed in the lower end of the rotary cutting pipe, the output end of the lower side of the miniature double-shaft motor is fixedly sleeved with a rotary cutting knife, a cavity is formed in one side of the rotary cutting pipe, and a suction inlet is formed in the lower end of the cavity; a fixing shell is fixedly arranged on the inner wall of one side of the middle end of the rotary cutting pipe, and a piston is arranged in the fixing shell in a sliding mode. According to the intravascular plaque rotary cutting and thrombus suction integrated device, after plaque rotary cutting is conducted, thrombus can be directly sucked out, suction equipment does not need to be inserted for the second time, the working efficiency can be greatly improved, and the pain of a patient is relieved.

The invention discloses a thrombus aspiration catheter with a reducing balloon and a preparation method, and relates to the technical field of medical instruments. The suction catheter comprises a catheter main body, a compliance balloon, two Luer tapers and two developing rings, the double-cavity structure of the catheter main body comprises a thrombus suction cavity and a balloon pressurization cavity; the compliance balloon is fixedly mounted at the far end of the catheter main body, and the compliance balloon is communicated with the balloon pressurizing cavity; the catheter body is provided with a reducing area with the near-end inner diameter smaller than the far-end inner diameter in the axial direction. The two developing rings are respectively embedded in the catheter main body corresponding to the two sides of the compliance balloon; the two Luer tapers are respectively a first Luer taper and a second Luer taper, the first Luer taper is communicated with the thrombus aspiration cavity, and the second Luer taper is communicated with the balloon pressurization cavity so as to input pressure into the balloon pressurization cavity. By means of the balloon adherence, the plugging effect is improved, the suction efficiency is improved, the thrombus falling risk is reduced, and the catheter in-place performance and the operation flexibility are improved.

Disclosed herein are pneumatic syringes and associated systems and methods. A pneumatic syringe in accordance with the present technology can include a syringe barrel, a pneumatic barrel, and a plunger assembly extending between and movably positioned within the syringe barrel and the pneumatic barrel. The pneumatic syringe can further include a control unit configured to direct a flow of pressurized fluid from a fluid source into the pneumatic barrel to cause the plunger assembly to move between a withdrawn position and a depressed position within the syringe barrel. To move to the withdraw position, the control unit can direct the flow of pressurized fluid into a distal chamber of the pneumatic barrel to drive the plunger assembly proximally. To move to the depressed position, the control unit can direct the flow of pressurized fluid into a proximal chamber of the pneumatic barrel to drive the plunger assembly distally.

This invention provides a thrombus aspiration catheter with a variable distal inner diameter, belonging to the field of interventional surgical instrument technology. The catheter includes an interventional catheter, an operating handle, and a collection component. The interventional catheter is used to move along the blood vessel to approach the thrombus location. The operating handle is located at the proximal end of the interventional catheter to provide suction force. The collection component is located at the distal end of the interventional catheter, with its proximal end communicating with the interventional catheter and its distal end open and adjustable in diameter. When the interventional catheter moves along the blood vessel to approach the thrombus, the diameter of the collection component is in a contracted state and not larger than the diameter of the interventional catheter. After the collection component reaches its position, it expands to increase its distal diameter for overall thrombus aspiration. This invention primarily addresses the technical problems of existing small-diameter thrombus aspiration catheters, which suffer from insufficient suction force, require repeated aspiration, and are prone to thrombus escape, while large-diameter catheters have poor permeability and are difficult to reach the lesion site.

The utility model provides an intravascular thrombus aspiration catheter. The intravascular thrombus aspiration catheter comprises an internal flow channel, a far-end aspiration catheter section, a middle catheter section and a near-end driving catheter section, and the internal flow channel is sequentially communicated with the far-end aspiration catheter section, the middle catheter section and the near-end driving catheter section from the far end of the intravascular thrombus aspiration catheter to the near end of the intravascular thrombus aspiration catheter. Wherein the intravascular thrombus aspiration catheter further comprises an aspiration inlet and an outflow window, and the internal flow channel is communicated with the aspiration inlet and the outflow window; a filter screen is arranged in an inner flow channel of the middle guide pipe section and is positioned between the suction inlet and the outflow window; at least one of the far-end suction catheter section, the middle catheter section and the near-end driving catheter section is detachably connected, and the suction inlet is formed in the far-end suction catheter section. According to the intravascular thrombus aspiration catheter provided by the invention, due to the segmented detachable design, the use convenience is facilitated.