A thrombus aspiration catheter

Abstract

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.

Description

Technical Field

[0001] The present invention relates to the technical field of medical machinery, and in particular to a thrombus aspiration catheter. Background Art

[0002] With the improvement of people's living standards, the incidence of thrombotic diseases is increasing, which can block or completely interrupt blood flow. If this type of embolism occurs in the cardiovascular and cerebrovascular systems, it will cause serious consequences, ranging from disability to death. How to quickly and effectively eliminate these blockages is an urgent problem that those skilled in the art need to solve. In the prior art, suction catheters are usually used to remove foreign matter such as thrombi from blood vessels. The suction catheter is delivered to the site of the thrombus, and by applying negative pressure at the proximal end of the suction catheter, the thrombus and other foreign matter are discharged from the body along the inner lumen of the catheter, thereby re-establishing blood circulation.

[0003] In the process of aspirating thrombus using a thrombus aspiration catheter in the prior art, it is necessary to use a guide wire to place the catheter into the blood vessel, which is a complicated and time-consuming operation. Summary of the Invention

[0004] In order to solve the defect in the prior art that the aspiration catheter needs to be placed into the blood vessel using a guide wire, which makes the operation complicated and time-consuming, and to achieve the effect of reducing the difficulty of operation and saving operation time, the present invention provides a thrombus aspiration catheter.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a thrombus aspiration catheter, comprising:

[0007] The catheter has a conical structure at one end for inserting into the blood vessel, a suction port for the thrombus to enter is provided on the side wall of the conical structure, and a connection port for connecting to a suction device is provided on the wall of the catheter;

[0008] a spiral structure, disposed in the catheter and used to support the catheter;

[0009] A mounting base and a rotating wheel, wherein the mounting base is provided with a mounting hole for connecting the conduit, and the rotating wheels are provided in a pair, and the rotating wheels are rotatably mounted on the mounting base, and the rotation axis of each rotating wheel is parallel to the mounting hole. A channel is provided in the mounting base and communicates with the mounting hole, and a through hole connected to the channel is provided on the outer wall of the mounting base;

[0010] The filaments are provided in four pieces, each of which is connected to one end of the conduit provided with the conical structure. The connection positions of the four filaments and the conduit are evenly distributed along the circumference of the conduit. Each filament passes through the conduit, the mounting hole, the channel and the through hole in sequence. The two opposite filaments are provided in a pair, and each pair of filaments is wound in opposite directions on the corresponding rotating wheel.

[0011] Furthermore, a damping structure is included, which is arranged between the rotating wheel and the mounting seat and is used to increase the friction between the rotating wheel and the mounting seat.

[0012] Furthermore, the damping structure includes an elastic damping ring, which is mounted on the mounting seat, and the outer circumferential wall of the damping ring is provided with arc-shaped protrusions and arc-shaped depressions arranged alternately along the circumference of the damping ring. The runner is mounted on the damping ring, and the inner wall of the runner is also provided with arc-shaped protrusions and arc-shaped depressions arranged alternately along the circumference of the runner.

[0013] Furthermore, the damping ring is a rubber ring or a silicone ring.

[0014] Furthermore, a ring groove is provided on the surface of the mounting seat, the damping ring is sleeved in the ring groove, and the damping ring protrudes from the ring groove.

[0015] Furthermore, the mounting seat includes a cylindrical structure and an ear plate protruding from the surface of the cylindrical structure, the mounting hole is arranged at one end of the cylindrical structure, the ear plate is arranged at one end of the cylindrical structure close to the mounting hole, the through hole is arranged on the ear plate, and the length of the through hole from the center line of the cylindrical structure is greater than the length of the surface of the wheel from the center line of the cylindrical structure.

[0016] Furthermore, it also includes a wedge-shaped shell and a sleeve, the sleeve is sleeved on the end of the cylindrical structure away from the mounting hole, the wedge-shaped shell cover is arranged on one side of the rotor, and one end of the wedge-shaped shell is abutted against the ear plate, and the other end of the wedge-shaped shell is connected to the sleeve, and each of the through holes is arranged inside the wedge-shaped shell so that the part of the filament passing through the through hole is inside the wedge-shaped shell.

[0017] Furthermore, it also includes a positioning ring, an axial ring is provided on the outer circumferential wall of the cylindrical structure, and the positioning rings are arranged as a pair, and the pair of positioning rings are both mounted on the cylindrical structure, and there is a spacing between the pair of positioning rings, and there is a spacing between the positioning ring and the axial ring, and corresponding rotating wheels are respectively provided between the positioning ring and the axial ring and between the pair of positioning rings.

[0018] Furthermore, an annular protrusion is provided in the middle of the rotating wheel for separating a pair of the filaments wound on the rotating wheel.

[0019] Furthermore, the inner wall of the catheter is provided with a plurality of guide structures, and the guide structures are for the corresponding filaments to pass through and are used to guide the corresponding filaments.

[0020] Compared with the prior art, the present invention has achieved the following technical effects:

[0021] The thrombus aspiration catheter of the present invention can rotate a rotating wheel during use, loosening or reeling in a filament that can pull the catheter, causing it to bend, thereby actively adjusting the catheter's forward direction. This reduces damage to the blood vessel caused by the catheter and eliminates the need for a guidewire, reducing operational difficulty and surgical time. Furthermore, the distal end of the catheter is provided with a tapered structure, with suction ports provided on the sidewalls of the tapered structure. This facilitates the catheter's passage within the blood vessel and prevents the catheter from damaging the inner wall of the blood vessel. Furthermore, by rotating the rotating wheel to unwind the filament, the suction ports on the sidewalls of the tapered structure can mate with the inner wall of the blood vessel, allowing thrombi on the inner wall of the blood vessel to be scraped or sucked away by the suction ports, thereby improving the thrombus removal efficiency of the thrombus aspiration catheter. Finally, the spiral structure within the catheter prevents the catheter from being crushed by air pressure and the effects of the blood vessels, while also ensuring the catheter's resilience to facilitate adjustment of the catheter's forward direction with the filament. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a schematic structural diagram of a thrombus aspiration catheter provided in an embodiment of the present invention;

[0024] Figure 2 This is a schematic structural diagram of the thrombus aspiration catheter provided in an embodiment of the present invention after the wedge-shaped housing and sleeve are removed;

[0025] Figure 3 A schematic structural diagram of a mounting base provided in an embodiment of the present invention;

[0026] Figure 4 for Figure 3 AA section view in;

[0027] Figure 5 for Figure 4 BB cross-sectional view in;

[0028] Figure 6 Schematic diagram of the structure of a catheter provided in an embodiment of the present invention.

[0029] Explanation of the accompanying drawings: 1. catheter; 2. conical structure; 3. suction port; 4. connecting port; 5. mounting seat; 501. cylindrical structure; 502. ear plate; 6. rotor; 7. thread; 8. damping ring; 9. wedge-shaped shell; 10. sleeve; 11. shaft ring; 12. positioning ring; 13. annular protrusion; 14. guide ring. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] refer to Figures 1-6 As shown, a thrombus aspiration catheter 1 is provided in an embodiment of the present invention.

[0033] Specifically, the thrombus aspiration catheter 1 includes a catheter 1 , a spiral structure, a mounting seat 5 , a rotating wheel 6 and a filament 7 .

[0034] The end of the catheter 1, intended for insertion into a blood vessel, is configured as a tapered structure 2. A suction port 3 is provided on the sidewall of the tapered structure 2 for entry of thrombi. To prevent the tip of the tapered structure 2 from damaging the blood vessel, the top of the tapered structure 2 is spherical. A connection port 4 for connecting to a suction device is also provided on the wall of the catheter 1.

[0035] A helical structure is disposed within the catheter 1 and is used to support the catheter 1. Optionally, the helical structure is a helically disposed steel wire. For example, the helical structure can be a single-piece helical steel wire or a multi-segment helical steel wire. Optionally, the helical structure conforms to the inner wall of the catheter 1. Alternatively, the catheter 1 is configured as a double-layered cannula, with the helical structure disposed between the two layers.

[0036] The mounting base 5 has a mounting hole for connecting to the catheter 1. For example, the catheter 1 can be inserted into the mounting hole. A pair of rotating wheels 6 are provided. Each of the rotating wheels 6 is rotatably mounted on the mounting base 5. The rotating wheels 6 are coaxially arranged, with the rotation axis of each rotating wheel 6 parallel to the mounting hole. A passage is defined within the mounting base 5, communicating with the mounting hole. A through-hole is defined on the outer wall of the mounting base 5, communicating with the passage.

[0037] The filaments 7 are arranged in four pieces, each of which is connected to one end of the conduit 1 provided with a tapered structure 2, and the connection positions of the four filaments 7 and the conduit 1 are evenly distributed along the circumference of the conduit 1. Each filament 7 passes through the conduit 1, the mounting hole, the passage and the through hole in this manner. The two filaments 7 arranged opposite to each other are arranged in a pair, and each pair of filaments 7 is wound in opposite directions on the corresponding runner 6, that is, each runner 6 is wound with a pair of filaments 7 wound in opposite directions. Taking any one runner 6 as an example, during the rotation of the runner 6, one of the pair of filaments 7 is wound and the other is relaxed, and the wound filament 7 pulls the conduit 1 so that the conduit 1 bends to the side where the wound filament 7 is located, and then during the reversal of the runner 6, the filament 7 originally wound is relaxed, and the filament 7 originally relaxed is wound, and the conduit 1 first recovers its deformation and then bends in the direction. By disposing four filaments 7 along the circumference of the catheter 1, and with a pair of oppositely disposed filaments 7 wound in opposite directions around the same rotating wheel 6, during actual use, the two rotating wheels 6 rotate in coordination, causing the catheter 1 to simultaneously receive the forces of the two adjacent filaments 7. The forces of the two adjacent filaments 7 are superimposed, causing the catheter 1 to bend in the direction between the two adjacent filaments 7. Furthermore, by adjusting the rotation angle of the two rotating wheels 6, the deflection direction of the catheter 1 can be adjusted, causing the catheter 1 to bend toward the center of the two adjacent filaments 7, or toward one of the two adjacent filaments 7. With this arrangement, the two rotating wheels 6 cooperate to allow the catheter 1 to bend in any direction.

[0038] The thrombus aspiration catheter 1 provided by the embodiment of the present invention can rotate the wheel 6 during use, and the wheel 6 can loosen or reel in the filament 7. The filament 7 can pull the catheter 1, causing the catheter 1 to bend, thereby actively adjusting the forward direction of the catheter 1, reducing the damage to the blood vessel caused by the catheter 1, and making the thrombus aspiration catheter 1 of the present invention unnecessary for guidewire guidance, thereby reducing the difficulty of operation and shortening the operation time. At the same time, the distal end of the catheter 1 is provided with a tapered structure 2, and the side wall of the tapered structure 2 is provided with a suction port 3, which makes it easier for the catheter 1 to pass through the blood vessel, so that the catheter 1 does not cause damage to the inner wall of the blood vessel. In addition, by rotating the wheel 6 to reel in the filament 7, the suction port 3 on the side wall of the tapered structure 2 can be in contact with the inner wall of the blood vessel, so that the thrombus on the inner wall of the blood vessel can be scraped or sucked away by the suction port 3, thereby improving the thrombus removal effect of the thrombus aspiration catheter 1. Finally, the spiral structure in the catheter 1 can prevent the catheter 1 from being compressed by air pressure and blood vessels, and can ensure that the catheter 1 has resilience to facilitate adjustment of the forward direction of the catheter 1 in conjunction with the filament 7.

[0039] In some embodiments provided by the present invention, the mounting base 5 includes a cylindrical structure 501 and an ear plate 502 protruding from the surface of the cylindrical structure 501. The mounting hole is provided at one end of the cylindrical structure 501, the ear plate 502 is provided at the end of the cylindrical structure 501 close to the mounting hole, the through hole is provided on the ear plate 502, and the channel is provided inside the ear plate 502. Specifically, the through hole is provided on the side of the ear plate 502 away from the mounting hole. Figure 4 As shown, the distance between the through-hole and the centerline of the cylindrical structure 501 is greater than the distance between the surface of the rotating wheel 6 and the centerline of the cylindrical structure 501, so that the filament 7 can pass through the through-hole and be wound on the corresponding rotating wheel 6. Both rotating wheels 6 are mounted on the cylindrical structure 501 and are arranged in sequence along the axial direction of the cylindrical structure 501.

[0040] During use, the user can grasp cylindrical structure 501, with their thumb and index finger positioned on either side of cylindrical structure 501. The thumb and index finger can be used to rotate wheel 6 to adjust the direction of catheter 1's movement, and the cylindrical structure 501 can be pushed or pulled to control the movement of catheter 1. With this arrangement, wheel 6 can be directly attached to cylindrical structure 501, simplifying the structure of mounting base 5 and the connection between wheel 6 and mounting base 5, making manufacturing easier. Furthermore, the user can hold mounting base 5 and rotate wheel 6 with their thumb and index finger, creating a rational design that reduces user effort.

[0041] Since the catheter 1 has a certain elastic force and is provided with a spiral structure, after adjusting the angle of the rotating wheel 6, the rotating wheel 6 will be rotated and reset by the tension of the filament 7. In order to enable the rotating wheel 6 to maintain the adjusted angle and prevent the rotating wheel 6 from resetting under the tension of the filament 7, in some embodiments provided by the present invention, the thrombus aspiration catheter 1 also includes a damping structure. The damping structure is arranged between the rotating wheel 6 and the mounting seat 5 to increase the friction between the rotating wheel 6 and the mounting seat 5. When the user needs to use the two rotating wheels 6 to rotate in coordination to adjust the forward direction of the catheter 1, the user can first adjust the angle of the first rotating wheel 6. The first rotating wheel 6 is maintained at the adjusted angle under the action of the damping structure, and then the angle of the second rotating wheel 6 can be adjusted. This arrangement makes the use of the thrombus aspiration catheter 1 more flexible and convenient.

[0042] refer to Figure 5 As shown, in some embodiments provided by the present invention, the damping structure includes an elastic damping ring 8. The damping ring 8 is mounted on the mounting seat 5, and the outer circumferential wall of the damping ring 8 is provided with arc-shaped protrusions and arc-shaped depressions arranged alternately along the circumference of the damping ring 8. The runner 6 is mounted on the outer side of the damping ring 8, and the inner wall of the runner 6 is also provided with arc-shaped protrusions and arc-shaped depressions arranged alternately along the circumference of the runner 6. The protrusion of the runner 6 has the same shape as the protrusion of the damping ring 8, and the depression of the runner 6 has the same shape as the depression of the damping ring 8. The protrusion of the runner 6 matches the depression of the damping ring 8, and the depression of the runner 6 matches the protrusion of the damping ring 8. Thus, during the rotation of the wheel 6, the protrusions and depressions on the wheel 6 squeeze the protrusions and depressions on the damping ring 8, causing the damping ring 8 to deform and hinder the wheel 6. After the wheel 6 rotates to its proper position, the protrusions on the wheel 6 cooperate with the depressions on the damping ring 8, thereby positioning the wheel 6 and preventing the wheel 6 from rotating under the tension of the filament 7. This arrangement simplifies the damping structure, and the wheel 6 can be indexed by the different cooperation between the protrusions on the wheel 6 and the depressions in the damping ring 8, so that the wheel 6 can rotate to a specific angle, making the use of the thrombus aspiration catheter 1 more flexible and convenient.

[0043] In some embodiments provided by the present invention, the damping ring 8 is configured as a rubber ring or a silicone ring.

[0044] In some embodiments provided herein, the surface of the mounting base 5 is provided with an annular groove, into which the damping ring 8 is fitted, with the damping ring 8 protruding. Specifically, the annular groove is provided on the cylindrical structure 501. Positioning the damping ring 8 within the annular groove facilitates positioning of the damping ring 8 and prevents axial movement of the damping ring 8 along the mounting base 5. Furthermore, to prevent the damping ring 8 from rotating about the mounting base 5, the damping ring 8 can be bonded to the annular groove.

[0045] In some embodiments provided by the present invention, the thrombus aspiration catheter 1 further includes a wedge-shaped shell 9 and a sleeve 10. The sleeve 10 is sleeved on the end of the cylindrical structure 501 away from the mounting hole, the wedge-shaped shell 9 is covered on one side of the rotating wheel 6, and one end of the wedge-shaped shell 9 is against the ear plate 502, and the other end of the wedge-shaped shell 9 is connected to the sleeve 10. For example, the wedge-shaped shell 9 can be bonded to the sleeve 10. Each through hole is inside the wedge-shaped shell, so that the part of the filament 7 passing through the through hole is inside the wedge-shaped shell 9. With this arrangement, the wedge-shaped shell 9 can be used to protect the filament 7, preventing the user from accidentally touching the filament 7 during operation.

[0046] In some embodiments provided by the present invention, the thrombus aspiration catheter 1 further includes a positioning ring 12. An axial ring 11 is provided on the outer circumferential wall of the cylindrical structure 501. The positioning rings 12 are provided in a pair, each of which is fitted onto the cylindrical structure 501, with a spacing between the pair of positioning rings 12 and a spacing between the positioning rings 12 and the axial ring 11. Corresponding runners 6 are provided between the positioning rings 12 and the axial ring 11, and between the pair of positioning rings 12. With this arrangement, the runner 6 can be axially positioned by the positioning rings 12 and the axial ring 11, which, on the one hand, prevents the runner 6 from falling out along the cylindrical structure 501, and on the other hand, avoids mutual interference between the two runners 6.

[0047] Optionally, the positioning ring 12 may be connected to the cylindrical structure 501 by threading or bonding.

[0048] In some embodiments provided herein, an annular protrusion 13 is provided in the middle of the rotating wheel 6. The annular protrusion 13 is used to separate a pair of filaments 7 wound on the rotating wheel 6. In this way, the user can drive the rotating wheel 6 to rotate by operating the annular protrusion 13, and the rotating wheel 6 will not press on the filaments 7 when rotating, which is more convenient to use.

[0049] In some embodiments provided by the present invention, a plurality of guide structures are provided on the inner wall of the catheter 1, and the guide structures are for corresponding filaments 7 to pass through, and the guide structures are used to guide the corresponding filaments 7. Such a configuration can avoid the problem of mutual entanglement between the filaments 7.

[0050] Optionally, the guide structure includes a plurality of guide rings 14 , which are provided on the inner wall of the catheter 1 and arranged in sequence along the axial direction of the catheter 1 , and the filament 7 passes through each guide ring 14 in sequence.

[0051] Furthermore, a guide ring 14 is also provided in the channel for guiding the filament 7 .

[0052] Furthermore, the thrombus aspiration catheter 1 includes an on-off valve, which is disposed in the mounting hole and through which the filament 7 passes. The on-off valve can be closed during aspiration and opened when adjusting the angle of the catheter 1. The on-off valve can be a stop valve or a ball valve.

[0053] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A thrombus aspiration catheter, characterized in that: include: The catheter has a conical structure at one end for inserting into the blood vessel, a suction port for the thrombus to enter is provided on the side wall of the conical structure, and a connection port for connecting to a suction device is provided on the wall of the catheter; a spiral structure, disposed in the catheter and used to support the catheter; A mounting base and a rotating wheel, wherein the mounting base is provided with a mounting hole for connecting the conduit, and the rotating wheels are provided in a pair, and the rotating wheels are rotatably mounted on the mounting base, and the rotation axis of each rotating wheel is parallel to the mounting hole. A channel is provided in the mounting base and communicates with the mounting hole, and a through hole connected to the channel is provided on the outer wall of the mounting base; Four filaments are provided, each of the filaments is connected to one end of the conduit provided with the tapered structure, the connection positions of the four filaments to the conduit are evenly distributed along the circumference of the conduit, each of the filaments passes through the conduit, the mounting hole, the passage, and the through hole in sequence, and two opposing filaments are provided as a pair, and each pair of filaments is wound around the corresponding rotating wheel in opposite directions; The mounting seat includes a cylindrical structure and an ear plate protruding from the surface of the cylindrical structure, the mounting hole is provided at one end of the cylindrical structure, the ear plate is provided at an end of the cylindrical structure close to the mounting hole, the through hole is provided on the ear plate, and the length of the through hole from the center line of the cylindrical structure is greater than the length of the surface of the runner from the center line of the cylindrical structure; It also includes a wedge-shaped shell and a sleeve, the sleeve is sleeved on the end of the cylindrical structure away from the mounting hole, the wedge-shaped shell cover is arranged on one side of the rotating wheel, and one end of the wedge-shaped shell is abutted against the ear plate, and the other end of the wedge-shaped shell is connected to the sleeve, and each of the through holes is arranged inside the wedge-shaped shell so that the part of the filament passing through the through hole is inside the wedge-shaped shell.

2. The thrombus aspiration catheter according to claim 1, characterized in that: It also includes a damping structure, which is arranged between the rotating wheel and the mounting seat and is used to increase the friction between the rotating wheel and the mounting seat.

3. The thrombus aspiration catheter according to claim 2, characterized in that: The damping structure includes an elastic damping ring, which is mounted on the mounting seat. The outer circumferential wall of the damping ring is provided with arc-shaped protrusions and arc-shaped depressions arranged alternately along the circumference of the damping ring. The rotating wheel is mounted on the damping ring, and the inner wall of the rotating wheel is also provided with arc-shaped protrusions and arc-shaped depressions arranged alternately along the circumference of the rotating wheel.

4. The thrombus aspiration catheter according to claim 3, characterized in that: The damping ring is a rubber ring or a silicone ring.

5. The thrombus aspiration catheter according to claim 3, characterized in that: An annular groove is provided on the surface of the mounting seat, the damping ring is sleeved in the annular groove, and the damping ring protrudes from the annular groove.

6. The thrombus aspiration catheter according to claim 1, characterized in that: It also includes a positioning ring, an axial ring is provided on the outer circumferential wall of the cylindrical structure, and the positioning rings are arranged in a pair. The pair of positioning rings are both mounted on the cylindrical structure, and there is a distance between the pair of positioning rings, and there is a distance between the positioning ring and the axial ring. Corresponding rotating wheels are respectively provided between the positioning ring and the axial ring and between the pair of positioning rings.

7. The thrombus aspiration catheter according to claim 1, characterized in that: An annular protrusion is provided in the middle of the rotating wheel for separating a pair of filaments wound on the rotating wheel.

8. The thrombus aspiration catheter according to claim 1, characterized in that: The inner wall of the catheter is provided with a plurality of guide structures, and the guide structures are for the corresponding filaments to pass through and are used to guide the corresponding filaments.

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