CN214342500U - Thrombus aspiration catheter - Google Patents

Abstract

The utility model provides a thrombus suction catheter belongs to the medical instrument field, including the pipe seat and the pipe body, be provided with the spooler in the pipe seat, the pipe body is from the inside and by inlayer polymer pipe, middle level stay tube and outer polymer pipe component in proper order outward, the internal portion of pipe is provided with 0-4 core silks along circumferencial direction evenly distributed, and the one end fixed connection of core silk is on the spooler, and the distal end at the pipe body is fixed to the other end, but outer polymer pipe distal end is provided with the bellying of circumference inflation and shrink, and the bellying comprises bellying near-end, bellying middle section and the bellying distal end that connects gradually from the near-end to the distal end, and the inside elastic spiral that is provided with of bellying near-end and bellying distal end twines the silk. The utility model discloses a set up the core silk and make the pipe angle of advancing can freely adjust in a flexible way, set up protruding section and reduce the recoil for the pipe body is still portable when the near-end shutoff, has reduced the operation degree of difficulty, improves the suction effect.

Description

Thrombus aspiration catheter

Technical Field

The utility model relates to the field of medical equipment, concretely relates to thrombus suction catheter.

Background

With the current increase in the living standard of people, the incidence of thrombotic diseases is increasing, which can block or completely interrupt the blood flow. If such embolism in cardiovascular and cerebrovascular occurs, serious consequences, even disability, and death may occur, and how to rapidly and effectively eliminate the obstruction is a problem to be solved by those skilled in the art.

In the prior art, an aspiration catheter is generally used to remove foreign materials such as thrombus in a blood vessel. The suction catheter is conveyed to the thrombus site, and foreign matters such as thrombus are discharged out of the body along the inner cavity of the catheter by applying negative pressure to the proximal end of the suction catheter, so that blood circulation is reestablished.

However, the current suction catheter cannot effectively reach the expected lesion position, is complex to operate, has a high risk factor and does not have good suction efficiency, and is mainly embodied in the following aspects:

(1) present most suction catheter is in order to increase the development nature of distal end, adopts the development ring of rigidity more, and this kind of development ring adopts the mode of forging and pressing more to fix at the distal end, and the development ring after the forging and pressing is many to have the polygon of edges and corners, and this can cause two drawbacks, and first in the in-process fish tail vascular wall or supporting pipe inner wall that advances, secondly the thrombus that is sucked can block at the catheter head end, causes the operation failure.

(2) Most of the existing suction catheters are not provided with a balloon blocked by a near end, so that most of blood is sucked from the near end, the suction effect on the far end cannot be ensured, the amount of the sucked blood is increased, the physical burden of a patient is increased, foreign body blood needs to be supplemented in the operation process, the efficiency is low, the operation time is prolonged, and the operation risk is increased; and in the thrombus suction process, the thrombus can be inevitably broken or fall off, if the broken small thrombus is not treated in time, the blood flow of the small thrombus to a narrow blood vessel at the far end along with the blood is extremely easy to cause, and unpredictable risks are caused to patients. If add the blood of sacculus separation near-end, only can suck the blood that blocks up the section distal end during the suction, so this risk can not appear, so add very crucial of sacculus, but the product of few parts of add sacculus is again because the unable back-and-forth movement of suction catheter causes the suction effect poor to distal end thrombus when the sacculus expands, causes the suction incomplete.

(3) In the prior art, a guide wire, an intermediate catheter and a guide catheter are used for guiding an aspiration catheter to the proximal end of thrombus in the operation process, and the aspiration catheter moves back and forth in a blood vessel along the guide wire in the aspiration process. The cooperation between the catheters of the above procedure requires at least three hemostatic valves, which reduces the actual effective length of the catheter, and is cumbersome and complicated to operate, requiring constant adjustment of the hemostatic valves.

(4) The aspiration catheter is moved adherently within the vessel, and therefore the aspiration port of the aspiration catheter is also off-center from the vessel, which results in aspiration of the thrombus also being off-center, resulting in incomplete aspiration of the thrombus.

(5) When thrombus is sucked in a tortuous blood vessel, the sucked blood flow has a recoil effect on a catheter body, if the thrombus is not effectively supported or fixed, the catheter is easy to swing back and forth during suction, the blood vessel is damaged, even the swing amplitude is too large, so that the catheter is withdrawn from a target suction area, and the operation time is prolonged.

To facilitate understanding of the technical problems to be solved by the present application, the following detailed analysis is made in conjunction with some prior patent technologies:

patent No. CN1893997A discloses a rapid exchange type aspiration catheter, which removes the proximal guidewire lumen in the traditional design by adding a rapid exchange type guidewire lumen at the distal end to increase the cross-sectional area of the proximal lumen, but this does not increase the inner diameter of the distal end of the aspiration catheter, on the contrary, the whole hardness of the distal end of the catheter becomes high due to the addition of the rapid exchange guidewire lumen, the flexibility is not uniform, the trafficability of the complicated anatomical structure is poor, and the aspiration performance is reduced.

Patent No. CN101389371A discloses a double lumen aspiration catheter, which is similar to patent No. CN1893997A, and the improved place is that a beveled edge is added to the tip of the catheter, which is intended to prevent the aspiration catheter from scratching the blood vessel when advancing along the guide wire, but this design also makes the beveled edge of the tip of the catheter lose the support of the blood vessel wall, so as to get closer to the blood vessel wall, the eccentricity is more serious, and the effective aspiration area is compressed into a narrow triangular area, which affects the aspiration performance.

Patent numbers CN108904006A, CN104984461A, and US7422579 disclose a multi-lumen aspiration catheter, which is provided with a balloon capable of blocking blood flow, to ensure that the proximal end of thrombus is blocked, so that the suction force of the aspiration lumen can be concentrated on the thrombus, but such a structure will not move once the catheter is expanded by the balloon, so that the catheter cannot move during aspiration, and the aspiration effect is reduced, so that the thrombus at the distal end of the long occlusion section cannot be completely aspirated; and this multicavity structure does not set up the metal braid layer that can play the supporting role, and sacculus expansion chamber is in the malleation state when the suction, can give the squeezing action in suction chamber, and the suction chamber is in negative pressure state this moment, can increase extruded effect for the suction chamber has the risk of being squashed.

Patent No. CN102319097A discloses a suction catheter, the outer side of which is equipped with a sleeve, the structure of the sleeve is similar to that of a coaxial whole exchange type balloon catheter, and equivalently, a double-lumen tube is added on the outer side of the original suction catheter, the pushing performance and the passing performance of the double-lumen tube are not comparable to those of a single suction catheter, so that the double-lumen tube cannot reach the far end of a blood vessel with a complex anatomical structure along with the suction catheter, and the practical performance is reduced; and when the structure is pushed forwards for suction in a blood vessel with a complex anatomical structure, the suction catheter can be bent backwards and deformed due to resistance, due to the interaction between the suction catheter and the sleeve, the sleeve is fixed by the balloon but is easy to slide towards the near end due to the balloon with a larger size of the near-end blood vessel, and due to the interaction, the sleeve can be withdrawn backwards, the sealing effect disappears, and the operation time is prolonged.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the present invention provides a thrombus aspiration catheter.

The purpose of the utility model is realized by adopting the following technical scheme:

a thrombus suction catheter comprises a catheter base, a stress release tube and a catheter body, wherein the catheter base is connected with the catheter body through the stress release tube; the catheter comprises a catheter seat and is characterized in that a punching cavity and a suction cavity are arranged at the near end of the catheter seat, a winder is arranged in the catheter seat, the catheter body consists of an inner-layer polymer tube, a middle-layer support tube and an outer-layer polymer tube from inside to outside in sequence, the middle-layer support tube is a braided tube or a wound tube or the connection or the superposition of the braided tube and the wound tube, 0-4 core wires are uniformly distributed in the catheter body along the circumferential direction, one end of each core wire is fixedly connected to the winder, and the other end of each core wire is fixed at the far end of the catheter body; the distal end of the catheter body is provided with a flexible braided and/or wound ring; the outer polymer tube is composed of a plurality of sections of catheters with sequentially enhanced flexibility from a near end to a far end, the outer polymer tube is coated with a hydrophilic coating from the far end, the far end of the outer polymer tube is provided with a convex section capable of expanding and contracting circumferentially, the convex section is composed of a convex section near end, a convex section middle part and a convex section far end which are connected in sequence from the near end to the far end, and elastic spiral winding wires are arranged inside the convex section near end and the convex section far end;

the inner-layer polymer pipe is made of a material with a low friction coefficient, the braided pipe and the winding pipe are made of a high-elasticity alloy material, the braided pipe is in a grid shape, the winding pipe is in a spiral shape and is arranged between the inner-layer polymer pipe and the outer-layer polymer pipe as an intermediate layer, and the intermediate-layer support pipe can be made of a braided net pipe, a winding net pipe or a connection and superposition of the braided net pipe and the winding net pipe;

the core wires are high-toughness and high-compliance metal or polymer wires, the number of the core wires is 0-4, the catheter body has good compliance, and the direction can be not controlled according to specific requirements, and the flexibility of the product is enhanced without adding the core wires; the distal end of the catheter body is provided with a flexible braided and/or wound ring as a developing ring, and the flexible braided and/or wound ring is braided/wound by high-elasticity radiopaque alloy materials; the elastic spiral winding wire is made of a high-elasticity alloy material;

along with the change of the compliance of the far-end material selected by the outer-layer polymer tube, the range of the height of the bulge section is between 0 and 10mm, when the bulge section adopts a super-compliance material, the height of the bulge is close to 0mm, and then the two ends of the bulge tend to be flat;

compliance refers to the degree of difficulty of the elastomer deforming under the action of external force; the high compliance of the elastomer means that the elastomer has strong deformability, i.e. can cause large deformation under the action of small external force.

Preferably, the catheter holder inner wall is provided with a plurality of dentate grooves, the winder comprises a rotary table, a shifting lever, a reset spring, a core wire fixing hole, a threaded hole and a core wire fixing screw, the rotary table is rotatably fixedly connected with the catheter holder through a rotating shaft, a winding post is arranged at the center of the rotary table, the core wire fixing hole is formed in the rotary table, the threaded hole is formed in the core wire fixing hole and is vertical to the hole wall, the core wire fixing screw is arranged in the threaded hole, a shifting lever groove is formed in the rotary table, the reset spring and the shifting lever are arranged in the shifting lever groove, and a boss capable of being separated from or matched with the dentate grooves is arranged on the shifting lever.

Further preferably, the cross section of the winding post is circular or elliptical.

Further preferably, 2 core wires are uniformly distributed in the catheter body along the circumferential direction.

Preferably, the core wire is arranged between the inner-layer polymer tube and the outer-layer polymer tube of the catheter body.

Preferably, the core wire is arranged in a core wire cavity channel, and the core wire cavity channel is arranged on the pipe wall of the inner-layer polymer pipe or the outer-layer polymer pipe.

Preferably, the core wire tapers from a proximal end to a distal end, the core wire having a median diameter of 0.1 mm.

Preferably, 0-4 reinforcing fibers are arranged inside the catheter body, and the reinforcing fibers are compounded with the inner-layer polymer tube or the outer-layer polymer tube or arranged between the inner-layer polymer tube and the outer-layer polymer tube;

the reinforced fiber is a high-flexibility high-tensile-strength high-polymer material.

Preferably, the length of the pipe body of the hydrophilic coating part on the outer-layer polymer pipe is 0-100 cm.

Preferably, 0-4 linear alloy materials parallel to the catheter body are arranged on the inner pipe surface in the middle of the raised section.

The utility model has the advantages that:

(1) the design of the flexible weaving/winding developing ring can increase the flexibility of the far end on the premise of ensuring that the far end does not collapse, thereby improving the trafficability of the catheter; compare traditional forging and pressing ring and can not cause any damage to the pipe body, the diameter is more even can not produce the deformity, avoids the damage of deformity edges and corners to blood vessel or supporting pipe inner wall, also avoids causing the inspiratory hindrance to the thrombus.

(2) The middle layer of the catheter body is supported by weaving/winding metal wires, so that strong support can be provided for the catheter in the advancing process, guide wire guiding is not needed in the preparation process, and an operator can freely and flexibly adjust the advancing angle of the catheter until the catheter enters a target blood vessel by operating a wire winder to adjust the core wires in the catheter body, so that the operation difficulty is reduced, and the operation time is saved; and the suction port can be just opposite to the center of the embolism by adjusting the core wire during suction, so that the suction effect is increased, the blood loss of a patient is reduced, and the operation time is saved.

(3) The convex section at the far end can expand during stamping, so that the blood flow at the near end can be effectively blocked, the suction force is concentrated at the embolism, the suction effect is increased, the blood loss of a patient is reduced, and the fragmented plaque can be effectively prevented from flowing to a far-end blood vessel; the convex section can also support and fix the catheter body during suction, so that the back flushing effect in the suction process is reduced; when the protruding section expands, the middle part of the protruding section is clamped immovably to push the catheter body, at the moment, the outer-layer polymer tube provides a thrust force for the near end of the protruding section, the spiral winding wire at the near end of the protruding section contracts, then the length of the inner-layer polymer tube is relatively lengthened to move towards the far end, and meanwhile, the spiral winding wire at the far end of the protruding section can be driven to extend, so that the catheter body can still move back and forth when the protruding section expands, and therefore the thrombus at the far end of the long blocking section can be sucked, and the sucking effect is improved.

Drawings

The present invention is further explained by using the drawings, but the embodiments in the drawings do not constitute any limitation to the present invention, and for those skilled in the art, other drawings can be obtained according to the following drawings without any inventive work.

FIG. 1 is a schematic view showing the overall construction of a thrombus aspiration catheter according to the present invention;

FIG. 2 is a front view of the catheter hub of the present invention;

FIG. 3 is a perspective view of a catheter hub according to the present invention

FIG. 4 is a schematic rear view of the turntable of the present invention;

FIG. 5 is a cross-sectional view of the turntable of the present invention;

FIG. 6 is a schematic view of the toggle lever of the present invention;

FIG. 7 is a cross-sectional view of a catheter body according to the present invention;

FIG. 8 is a schematic view of the connection of the braided tube to the wound tube according to the present invention;

FIG. 9 is a schematic structural view of the flexible developer ring of the present invention;

FIGS. 10 and 11 are schematic structural views of the convex segment according to the present invention;

FIGS. 12 and 13 are schematic views showing the catheter body changing the advancing angle during the winding operation of the winder of the present invention;

FIGS. 14 and 15 are schematic views showing the forward movement of the catheter body during inflation of the raised section of the present invention.

Reference numerals:

1-a catheter hub; 2-stress relief tube; 3-a catheter body; 4-core filament; 5, rotating a disc; 6-a rotating shaft; 7-a deflector rod; 8-a poker groove; 9-a toothed groove; 10-a suction lumen; 11-punching the cavity; 12-a winder; 13-wrapping posts; 14-core wire fixing holes; 15-a threaded hole; 16-core wire set screws; 17-a return spring; 18-a boss; 19-inner polymer tube; 20-middle layer supporting tube; 21-outer polymer tube; 22-braided tube; 23-a winding tube; 24-a convex segment proximal end; 25-the middle of the convex section; 26-convex segment distal end; 27-a raised section proximal spiral wound wire; 28-the distal end of the raised section is helically wound around the wire; 29-stretched core wire, 30-tightened core wire, 31-elongated spiral-wound wire, 32-compressed spiral-wound wire.

Detailed Description

The invention will be further described with reference to the following examples.

Referring to fig. 1-15, embodiments of the present invention relate to a thrombus aspiration catheter, which includes a catheter hub 1, a stress release tube 2, and a catheter body 3, wherein the catheter hub 1 is connected to the catheter body 3 through the stress release tube 2; the proximal end of the catheter base 1 is provided with a punching cavity 11 and a suction cavity 10, a winder 12 is arranged in the catheter base 1, the catheter body 3 sequentially consists of an inner-layer polymer tube 19, a middle-layer support tube 20 and an outer-layer polymer tube 21 from inside to outside, the middle-layer support tube 20 is a braided tube 22 or a winding tube 23 or the connection or superposition of the braided tube and the winding tube, 0-4 core wires 4 are uniformly distributed in the catheter body 3 along the circumferential direction, one end of each core wire 4 is fixedly connected to the winder 12, and the other end of each core wire 4 is fixed at the distal end of the catheter body 3; the distal end of the catheter body 3 is provided with a flexible braided and/or wound ring; the outer-layer polymer tube 21 consists of a plurality of sections of catheters with sequentially enhanced flexibility from a near end to a far end, the outer-layer polymer tube 21 is coated with a hydrophilic coating from the far end, the far end of the outer-layer polymer tube 21 is provided with a convex section capable of expanding and contracting circumferentially, the convex section consists of a convex section near end 24, a convex section middle part 25 and a convex section far end 26 which are sequentially connected from the near end to the far end, and elastic spiral winding wires are arranged inside the convex section near end 24 and the convex section far end 26;

the winder 12 can effectively shorten or extend the length of the core wire 4 in the winding process, so as to regulate and control the relaxation of the core wire 4;

the inner wall of the catheter seat 1 is provided with a plurality of dentate grooves 9, the winder 12 comprises a rotary disc 5, a shift lever 7, a reset spring 17, a core wire fixing hole 14, a threaded hole 15 and a core wire fixing screw 16, the rotary disc 5 is rotatably and fixedly connected with the catheter seat 1 through a rotating shaft 6, a winding post 13 is arranged at the center of the rotary disc 5, the rotary disc is provided with the core wire fixing hole 14, the threaded hole 15 is arranged in the core wire fixing hole 14 and is vertical to the wall of the hole, the core wire fixing screw 16 is arranged in the threaded hole 15, a shift lever groove 8 is arranged in the rotary disc, the reset spring 17 and the shift lever 7 are arranged in the shift lever groove 8, and the shift lever 7 is provided with a boss 18 which can be separated from or matched with the dentate grooves 9;

one end of the core wire 4 penetrates through a core wire fixing hole 14 and a threaded hole 15 formed in the rotary table 5 and is fixed on the rotary table 5 through a core wire fixing screw 16, a poking rod groove 8 is formed in the rotary table 5, a reset spring 17 and a poking rod 7 are arranged in the poking rod groove 8, and the poking rod 7 can be pressed and poked to realize rotation of the rotary table 5, so that a winder 12 is driven to wind wires, and regulation and control of the core wire 4 are realized; the shifting lever 7 is provided with a boss 18, the shifting lever 7 is separated from and matched with the inner toothed groove 9 of the catheter holder 1 under the action of pressing of an operator and a reset spring 17 in the rotary disc 5, when the shifting lever 7 is pressed, the boss 18 on the shifting lever 7 is separated from the toothed groove 9, the rotary disc 5 can adjust the rotation angle through the shifting lever 7, when the shifting lever 7 is released, the shifting lever 7 recovers the matching of the boss 17 on the shifting lever 7 and the toothed groove 9 under the action of the reset spring 17, and the rotary disc is locked and cannot rotate at the moment, so that unlocking and locking are realized;

the thrombus aspiration catheter of the utility model has the working principle that: when the catheter is operated, the deflector rod 7 is pressed, the boss 18 on the deflector rod 7 is separated from the toothed groove 9 in the catheter holder 1, and the deflector rod 7 can drive the turntable 5 to rotate; when the rotary disc 5 rotates, the winder 12 on the rotary disc starts to wind, because the two core wires 4 are distributed at two sides of the winder 12, when the core wire 4 at one side is wound on the winding column 13, the axial overall length of the core wire 4 is shortened due to winding, the axial overall length is extended due to the fact that the core wire at the other side releases the winding length before part, and the distal end of the core wire 4 is driven to extend or contract, so that the distal end of the catheter body 3 is bent towards the contracted side of the core wire 4, and the advancing angle of the catheter body 3 is changed; when the middle part 25 of the convex section expands, the convex section is fixed in the vessel wall and remains motionless, at the moment, the catheter is pushed forward, the outer polymer tube 21 of the catheter is stressed to extrude the near end 24 of the convex section, the high-elasticity near end spiral winding wire 27 in the convex section is compressed, so that the length of the inner polymer tube 19 is relatively lengthened, and the inner polymer tube moves towards the far end, because the far end of the inner polymer tube 19 is connected with the far end of the outer polymer tube 21, the inner polymer tube 19 can drive the far end 26 of the convex section to extend while moving towards the far end, and the high-elasticity far end winding wire 28 of the convex section in the convex section is stretched, thereby realizing the displacement of the catheter body when the middle part 25 of the convex section expands.

Example 1

A thrombus suction catheter comprises a catheter base, a stress release tube and a catheter body, wherein the catheter base is connected with the catheter body through the stress release tube; the catheter comprises a catheter seat, a catheter body and a core wire, wherein the proximal end of the catheter seat is provided with a punching cavity and a suction cavity, a winder is arranged in the catheter seat, the catheter body consists of an inner polymer tube, a middle layer supporting tube and an outer polymer tube from inside to outside in sequence, the middle layer supporting tube is a braided tube or a wound tube or the connection or the superposition of the braided tube or the wound tube and the wound tube, 2 core wires are uniformly distributed in the catheter body along the circumferential direction, the core wires are arranged in a core wire cavity channel, the core wire cavity channel is arranged on the wall of the inner polymer tube or the outer polymer tube, one end of each core wire is fixedly connected to the winder, and the other end of each core wire is fixed at the distal end of the catheter body; the distal end of the catheter body is provided with a flexible braided and/or wound ring; the outer polymer tube is composed of a plurality of sections of catheters with sequentially enhanced flexibility from a near end to a far end, a hydrophilic coating is coated on the outer polymer tube from the far end, the length of the tube body of the hydrophilic coating part is 100cm, a protruding section capable of expanding and contracting circumferentially is arranged at the far end of the outer polymer tube, the protruding section is composed of a protruding section near end, a protruding section middle part and a protruding section far end which are sequentially connected from the near end to the far end, and elastic spiral winding wires are arranged inside the protruding section near end and the protruding section far end;

the pipe seat inner wall is provided with a plurality of dentate recesses, the spooler includes carousel, driving lever, reset spring, core silk fixed orifices, screw hole and core silk fixed screw, the carousel rotationally with pipe seat fixed connection through the rotation axis, the center department of carousel is provided with the cross section and is oval-shaped wrapping post, the core silk fixed orifices has been seted up on the carousel, perpendicular pore wall is provided with the screw hole in the core silk fixed orifices, threaded hole is provided with core silk fixed screw, the inside driving lever groove that is provided with of carousel, driving lever inslot is provided with reset spring and driving lever, be provided with on the driving lever can with dentate recess separation/complex boss.

Example 2

A thrombus suction catheter comprises a catheter base, a stress release tube and a catheter body, wherein the catheter base is connected with the catheter body through the stress release tube; the catheter comprises a catheter seat, a catheter body and a catheter core, wherein the catheter seat is provided with a punching cavity and a suction cavity at the near end, a winder is arranged in the catheter seat, the catheter body consists of an inner polymer tube, a middle support tube and an outer polymer tube from inside to outside in sequence, the middle support tube is a braided tube or a wound tube or the connection or the superposition of the braided tube and the wound tube, 2 core wires are uniformly distributed in the catheter body along the circumferential direction, the core wires are gradually thinned from the near end to the far end, the median diameter of the core wires is 0.1mm, the core wires are arranged in a gap between the inner polymer tube and the outer polymer tube of the catheter body, one end of each core wire is fixedly connected to the winder, and the other end of each core wire is fixed at the far end of the catheter body; the distal end of the catheter body is provided with a flexible braided and/or wound ring; the outer polymer tube is composed of a plurality of sections of catheters with sequentially enhanced flexibility from a near end to a far end, a hydrophilic coating is coated on the outer polymer tube from the far end, the length of the tube body of the hydrophilic coating part is 100cm, a protruding section capable of expanding and contracting circumferentially is arranged at the far end of the outer polymer tube, the protruding section is composed of a protruding section near end, a protruding section middle part and a protruding section far end which are sequentially connected from the near end to the far end, and elastic spiral winding wires are arranged inside the protruding section near end and the protruding section far end;

0-4 reinforcing fibers are arranged inside the catheter body, and the reinforcing fibers are compounded with the inner-layer polymer tube or the outer-layer polymer tube or arranged between the inner-layer polymer tube and the outer-layer polymer tube; 0-4 linear alloy materials parallel to the catheter body are arranged on the inner pipe surface in the middle of the raised section;

the pipe seat inner wall is provided with a plurality of dentate recesses, the spooler includes carousel, driving lever, reset spring, core silk fixed orifices, screw hole and core silk fixed screw, the carousel rotationally with pipe seat fixed connection through the rotation axis, the center department of carousel is provided with the cross section and is the circular shape wrapping post, the core silk fixed orifices has been seted up on the carousel, perpendicular pore wall is provided with the screw hole in the core silk fixed orifices, threaded hole is provided with core silk fixed screw, the inside driving lever groove that is provided with of carousel, driving lever inslot is provided with reset spring and driving lever, be provided with on the driving lever can with dentate recess separation/complex boss.

It should be finally noted that the above embodiments are only intended to illustrate the technical solutions of the present invention, and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims (10)

1. A thrombus suction catheter comprises a catheter base, a stress release tube and a catheter body, wherein the catheter base is connected with the catheter body through the stress release tube; the catheter comprises a catheter seat and is characterized in that a punching cavity and a suction cavity are arranged at the near end of the catheter seat, a winder is arranged in the catheter seat, the catheter body consists of an inner-layer polymer tube, a middle-layer support tube and an outer-layer polymer tube from inside to outside in sequence, the middle-layer support tube is a braided tube or a wound tube or the connection or the superposition of the braided tube and the wound tube, 0-4 core wires are uniformly distributed in the catheter body along the circumferential direction, one end of each core wire is fixedly connected to the winder, and the other end of each core wire is fixed at the far end of the catheter body; the distal end of the catheter body is provided with a flexible braided and/or wound ring; outer polymer pipe comprises the multistage pipe that strengthens in proper order from near-end to distal end compliance, outer polymer pipe has hydrophilic coating from the first coating of distal end, outer polymer pipe distal end is provided with the protruding section that can circumference inflation and shrink, protruding section comprises protruding section near-end, protruding section middle part and the protruding section distal end that connects gradually from near-end to distal end, protruding section near-end with the inside of protruding section distal end is provided with elastic spiral winding silk.

2. The thrombus aspiration catheter according to claim 1, wherein the catheter holder is provided with a plurality of tooth-shaped grooves on an inner wall thereof, the winder comprises a rotary plate, a shift lever, a return spring, a core wire fixing hole, a threaded hole and a core wire fixing screw, the rotary plate is rotatably and fixedly connected with the catheter holder through a rotating shaft, a winding post is arranged at the center of the rotary plate, the rotary plate is provided with the core wire fixing hole, the threaded hole is formed in the core wire fixing hole and is provided with the threaded hole at a vertical hole wall, the core wire fixing screw is arranged in the threaded hole, the rotary plate is internally provided with a shift lever groove, the shift lever groove is provided with the return spring and the shift lever, and the shift lever is provided with a boss capable of separating from/fitting with the tooth-shaped grooves.

3. A thrombectomy catheter according to claim 2, wherein said wrapping post is circular or elliptical in cross-section.

4. A thrombus aspiration catheter according to claim 1, wherein 2 core wires are uniformly distributed in the interior of the catheter body in the circumferential direction.

5. A thrombus aspiration catheter according to claim 1, wherein the core wire is disposed between the inner polymer tube and the outer polymer tube of the catheter body.

6. A thrombus aspiration catheter according to claim 1, wherein the core wire is disposed in a core wire lumen, and the core wire lumen is disposed on the wall of the inner polymer tube or the outer polymer tube.

7. A thrombectomy catheter according to claim 1, wherein said core wire is tapered from a proximal end to a distal end, and a median diameter of said core wire is 0.1 mm.

8. A thrombus aspiration catheter according to claim 1, wherein 0-4 reinforcing fibers are arranged in the catheter body, and the reinforcing fibers are compounded with the inner polymer tube or the outer polymer tube or arranged between the inner polymer tube and the outer polymer tube.

9. A thrombus aspiration catheter according to claim 1, wherein the length of the tube body of the hydrophilic coating coated portion of the outer polymer tube is 0 to 100 cm.

10. A thrombus suction catheter according to claim 1, wherein the inner tube surface of the middle part of the convex section is provided with 0-4 linear alloy materials parallel to the catheter body.

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