Variable-diameter mechanical thrombus rotary cutting system

Abstract

The invention discloses a variable-diameter mechanical thrombus rotary cutting system. Comprising a rotary cutting mechanism, a rotary sleeve which is connected with the rotary cutting mechanism and rotates synchronously with the rotary cutting mechanism, a fixed sleeve which is rotatably arranged in the rotary sleeve and is used for sucking thrombus, a bearing tube which is arranged in the fixed sleeve and is in transmission connection with the rotary cutting mechanism, and a guide wire which penetrates through the bearing tube and the rotary cutting mechanism; when in contact with blood vessels of different sizes, tool bits of different specifications do not need to be used, the maximum allowable reducing range of the tool bits is changed by pushing and pulling one end outside the bearing tube body, the tool bits can be automatically reduced to the designed maximum allowable reducing range when rotating, and the tool bits are in a gathering state before being in place, so that the blood vessels can be effectively prevented from being scratched; the operation success rate is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of thrombus removal, and particularly relates to a variable-diameter mechanical thrombus rotatory cutting system. Background Art

[0002] Mechanical thrombus removal devices are used for the removal and extraction of peripheral arterial thrombi and plaques. In the prior art, different-diameter cutter heads need to be selected according to the thickness of blood vessels and the blockage condition of thrombi. In actual operation, affected by the actual condition of blood vessels, the cutter heads need to be frequently replaced to ensure that the blood vessel wall will not be scratched and the thrombus can be effectively removed. Summary of the Invention

[0003] In order to solve the above problems existing in the prior art, the purpose of the present invention is to provide a variable-diameter mechanical thrombus rotatory cutting system.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A variable-diameter mechanical thrombus rotatory cutting system includes a rotatory cutting mechanism, a rotating sleeve connected to and synchronously rotating with the rotatory cutting mechanism, a fixed sleeve rotatably arranged inside the rotating sleeve and used for sucking thrombus, a bearing tube arranged inside the fixed sleeve and in transmission connection with the rotatory cutting mechanism, and a guide wire passing through the bearing tube and the rotatory cutting mechanism;

[0006] The rotatory cutting mechanism includes a plurality of cutter heads distributed in an annular array, a variable-diameter ring respectively slidably connected to the plurality of cutter heads, a limit ring arranged on the side of the variable-diameter ring away from the cutter heads and used for restricting the radial sliding of the cutter heads, and a control ring arranged on the side of the limit ring away from the variable-diameter ring and used for restricting the maximum radial sliding distance of the cutter heads.

[0007] Preferably, a auger is fixedly arranged on the circumferential side of the bearing tube inside the fixed sleeve, one end of the bearing tube away from the rotatory cutting mechanism is connected to a driving device, and the driving device is used for driving the bearing tube to rotate relative to the guide wire.

[0008] Preferably, it further includes a sewage suction port, and the sewage suction port includes a waist-shaped hole arranged on the side wall of the rotating sleeve and a special-shaped hole arranged on the side wall of the fixed sleeve, and the edge of the special-shaped hole is serrated.

[0009] Preferably, a hollow pin is fixedly arranged at one end of the variable-diameter ring close to the bearing tube, the hollow pin is in spline connection with the bearing tube, and the control ring is fixedly connected to the bearing tube.

[0010] Preferably, a magnetic sleeve is fixedly provided at one end of the variable-diameter ring away from the hollow pin. A fitting groove is respectively provided at one end of each of the plurality of cutter heads close to the variable-diameter ring. The magnetic sleeve attracts the plurality of cutter heads to gather together so that the fitting groove fits with the magnetic sleeve.

[0011] Preferably, a plurality of arc-shaped grooves corresponding to the plurality of cutter heads one by one are provided on the variable-diameter ring. The distances from both ends of the arc-shaped groove to the axis of the variable-diameter ring are not equal. A limiting member is slidably provided in each arc-shaped groove; the limiting member includes a guiding pin, mounting plates and sliding strips respectively fixedly arranged at both ends of the guiding pin; the mounting plates and the sliding strips are respectively located at both ends of the variable-diameter ring, and the mounting plate is fixedly connected to a corresponding cutter head.

[0012] Preferably, the bearing tube penetrates through the limiting ring. A plurality of sliding grooves are provided at one end of the limiting ring close to the variable-diameter ring. The sliding strip is slidably connected to a corresponding sliding groove. A friction plate is provided on the circumferential side of the limiting ring. The friction plate contacts with one end of the fixed sleeve close to the rotary cutting mechanism. The limiting ring has a tendency to keep relatively stationary with the fixed sleeve. After overcoming the friction force between the friction plate and the fixed sleeve, the limiting ring can rotate relative to the fixed sleeve.

[0013] Preferably, an inner conical ring is fixedly provided on the circumferential side of the control ring. The end of the inner conical ring along the cross-section of the control ring passing through the axis is in the shape of a wedge-shaped groove. One end of the sliding strip away from the magnetic sleeve is in the shape of a wedge-shaped convex block. The wedge-shaped convex block and the wedge-shaped groove cooperate. The maximum sliding distance of the limiting member relative to the variable-diameter ring is in a proportional relationship with the distance between the wedge-shaped convex block and the wedge-shaped groove.

[0014] Preferably, one end of the rotating sleeve close to the rotary cutting mechanism is fixedly connected to the variable-diameter ring. After the plurality of rotary cutting mechanisms gather together, they are in a conical shape. The bottom diameter of the gathered rotary cutting mechanisms is smaller than the diameter of the rotating sleeve.

[0015] Beneficially, synchronously moving the bearing tube and the fixed sleeve can control the overall movement of the variable-diameter mechanical thrombus rotary cutting system to different working positions, and adjust the thrombus resection position by reciprocally moving the bearing tube and the fixed sleeve.

[0016] The beneficial effects of the present invention are as follows: As a variable-diameter mechanical thrombus rotary cutting system, when contacting blood vessels of different sizes, it is not necessary to use cutter heads of different specifications. By pushing and pulling one end of the bearing tube outside the body, the maximum allowable variable-diameter range of the cutter head is changed. When the cutter head rotates, it will automatically change the diameter to the designed maximum allowable variable-diameter range. And before the cutter head is in place, the cutter heads are in a gathered state, which can effectively prevent scratching the blood vessels and improve the success rate of the operation. Brief Description of the Drawings

[0017] The present invention will be further described in detail below with reference to the drawings and specific implementation methods.

[0018] Figure 1 is a schematic structural diagram of the present invention;

[0019] Figure 2 is the present invention Figure 1 schematic side view structure diagram;

[0020] Figure 3 is the present invention Figure 2 schematic structure diagram in the A-A direction of the present invention;

[0021] Figure 4 is the present invention Figure 1 schematic structure diagram of the rotary cutting mechanism of the present invention;

[0022] Figure 5 is the present invention Figure 1 schematic explosion structure diagram;

[0023] Figure 6 is the present invention Figure 5 schematic enlarged structure diagram at B of the present invention;

[0024] Figure 7 is the present invention Figure 6 schematic diagram of the cooperation principle of the limiting member and the control ring under the cross-section of the present invention. Detailed Implementation Modes

[0025] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but only represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0027] The following combination Figures 1-7Describe the specific implementation of the present invention. A variable-diameter mechanical thrombus rotatory cutting system includes a rotatory cutting mechanism 11, a rotating sleeve 12 connected to and synchronously rotating with the rotatory cutting mechanism 11, a fixed sleeve 13 rotatably arranged inside the rotating sleeve 12 and used for sucking thrombus, a bearing tube 15 arranged inside the fixed sleeve 13 and drivingly connected to the rotatory cutting mechanism 11, and a guide wire 16 passing through the bearing tube 15 and the rotatory cutting mechanism 11;

[0028] The rotatory cutting mechanism 11 includes a plurality of cutter heads 18 distributed in an annular array, a variable-diameter ring 19 slidably connected to the plurality of cutter heads 18 respectively, a limiting ring 20 arranged on the side of the variable-diameter ring 19 away from the cutter heads 18 and used for restricting the radial sliding of the cutter heads 18, and a control ring 31 arranged on the side of the limiting ring 20 away from the variable-diameter ring 19 and used for restricting the maximum radial sliding distance of the cutter heads 18.

[0029] The plurality of cutter heads 18 slide along the radius of the circle where their annular array is located, that is, radially. The rotatory cutting radius of the cutter heads 18 can be actively adjusted according to the size of the blood vessel and the thrombus blockage situation, preventing the tip of the rotating cutter heads 18 from damaging the blood vessel wall, greatly improving the success rate of the operation and reducing the risk of the operation.

[0030] Beneficially, a auger 17 is fixedly arranged on the circumferential side of the bearing tube 15 inside the fixed sleeve 13. One end of the bearing tube 15 away from the rotatory cutting mechanism 11 is connected to a driving device, and the driving device is used to drive the bearing tube 15 to rotate relative to the guide wire 16. The driving device is a device such as a motor, which can drive one end of the bearing tube 15 outside the patient's body to rotate self. The guide wire 16 is flexible, and the area of the bearing tube 15 without the auger 17 covered is also flexible. The flexible bearing tube 15 can transmit torque in a bent state, so that the entire bearing tube 15 rotates around its own axis.

[0031] Beneficially, it further includes a sewage suction port 14. The sewage suction port 14 includes a waist-shaped hole 22 arranged on the side wall of the rotating sleeve 12 and a special-shaped hole 23 arranged on the side wall of the fixed sleeve 13. The edge of the special-shaped hole 23 is serrated. The special-shaped hole 23 remains stationary, and the waist-shaped hole 22 rotates. The sewage suction port 14 is periodically opened. The serrated shape of the edge of the special-shaped hole 23 has a certain shredding and cutting effect, which can prevent large thrombus from entering the sewage suction port 14 and avoid blocking the bearing tube 15.

[0032] Beneficially, a hollow pin 27 is fixedly arranged at one end of the variable-diameter ring 19 close to the bearing tube 15. The hollow pin 27 is in spline connection with the bearing tube 15, and the control ring 31 is fixedly connected to the bearing tube 15. The hollow pin 27 and the bearing tube 15 will rotate synchronously, and the two can slide relative to each other axially.

[0033] Beneficially, a magnetic sleeve 26 is fixedly provided at one end of the diameter-changing ring 19 away from the hollow pin 27. A fitting groove 24 is respectively provided at one end of each of the plurality of cutter heads 18 close to the diameter-changing ring 19. The magnetic sleeve 26 attracts the plurality of cutter heads 18 to gather together so that the fitting groove 24 fits with the magnetic sleeve 26. When the cutter heads 18 do not rotate, the magnetic sleeve 26 will attract the cutter heads 18 to gather together, and after the cutter heads 18 rotate, they overcome the magnetic force of the magnetic sleeve 26 and thus diverge.

[0034] Beneficially, a plurality of arc-shaped grooves 33 corresponding to the plurality of cutter heads 18 one by one are provided on the diameter-changing ring 19. The distances from both ends of the arc-shaped groove 33 to the axis of the diameter-changing ring 19 are not equal. A limiting member 25 is slidably provided in each arc-shaped groove 33; the limiting member 25 includes a guiding pin 35, mounting plates 34 and sliding strips 36 respectively fixedly provided at both ends of the guiding pin 35; the mounting plates 34 and the sliding strips 36 are respectively located at both ends of the diameter-changing ring 19, and the mounting plate 34 is fixedly connected to a corresponding cutter head 18. The rotation of the diameter-changing ring 19 will change the distance between the guiding pin 35 and the axis of the diameter-changing ring 19, so as to realize the diameter change of the plurality of cutter heads 18. After the cutter heads 18 rotate, under the action of centrifugal force, the cutter heads 18 will always change their diameters to the maximum allowable diameter, and the length of the arc-shaped groove 33 meets the requirements when the diameter of the cutter heads 18 is at the maximum value.

[0035] Beneficially, the bearing pipe 15 penetrates through the limiting ring 20. A plurality of sliding grooves 32 are provided at one end of the limiting ring 20 close to the diameter-changing ring 19. The sliding strip 36 is slidably connected to a corresponding sliding groove 32. A friction plate 28 is provided on the circumferential side of the limiting ring 20. The friction plate 28 contacts with one end of the fixed sleeve 13 close to the rotary cutting mechanism 11. The limiting ring 20 has a tendency to remain relatively stationary with the fixed sleeve 13. After overcoming the frictional force between the friction plate 28 and the fixed sleeve 13, the limiting ring 20 can rotate relative to the fixed sleeve 13. With the cooperation of the sliding groove 32 and the sliding strip 36, the cutter heads 18 are restricted to move only in the radial direction of the diameter-changing ring 19.

[0036] Beneficially, an inner conical ring 29 is fixedly provided on the circumferential side of the control ring 31. The end of the inner conical ring 29 along the cross-section passing through the axis of the control ring 31 is in the shape of a wedge-shaped groove 38. One end of the sliding strip 36 away from the magnetic sleeve 26 is in the shape of a wedge-shaped protrusion 37. The wedge-shaped protrusion 37 and the wedge-shaped groove 38 cooperate, and the maximum sliding distance of the limiting member 25 relative to the diameter-changing ring 19 is in a proportional relationship with the distance between the wedge-shaped protrusion 37 and the wedge-shaped groove 38. The distance between the limiting member 25 and the diameter-changing ring 19 affects the sliding range of the cutter 36, so as to control the maximum allowable diameter of the cutter heads 18 after diameter change.

[0037] Beneficially, one end of the rotating sleeve 12 close to the rotary cutting mechanism 11 is fixedly connected to the diameter-changing ring 19. After the plurality of rotary cutting mechanisms 11 are gathered, they form a conical shape, and the bottom diameter of the gathered rotary cutting mechanisms 11 is smaller than the diameter of the rotating sleeve 12. The diameter of the cutter head 18 in the gathered state is smaller than that of the rotating sleeve 12, so as to ensure that the cutter head 18 moves in the blood vessel before being in place and will not damage the blood vessel wall.

[0038] Beneficially, synchronously moving the carrier tube 15 and the fixed sleeve 13 can control the overall movement of the variable-diameter mechanical thrombus rotary cutting system to different working positions, and adjust the thrombus resection position by reciprocally moving the carrier tube 15 and the fixed sleeve 13.

[0039] The working principle of the present invention:

[0040] In the initial state, first insert the guide wire 16 into the blood vessel of the patient with thrombus. After inserting to a certain depth, keep the position and state of the guide wire 16 unchanged; then, under the guiding action of the guide wire 16, send the rotary cutting mechanism 11, the rotating sleeve 12, the fixed sleeve 13, and the carrier tube 15 to the position where the thrombus needs to be removed.

[0041] As shown in the Figure 1 attachment, only a part of the guide wire 16 is shown, and there is still a long length at both ends. Similarly, only a part of the fixed sleeve 13 and the carrier tube 15 are shown. The fixed sleeve 13 and the carrier tube 15 are respectively connected to the waste blood collection device and the motor drive device outside the patient's body.

[0042] Adjust the fixed sleeve 13 and the carrier tube 15 to make the rotary cutting mechanism 11 accurately reach the position where the thrombus needs to be removed. According to the thickness of the blood vessel and the degree of thrombus blockage, design a suitable rotary cutting range for the cutter head 18. According to the set result, by pushing and pulling one end of the carrier tube 15 outside the patient's body, adjust the axial movement of the carrier tube 15 relative to the fixed sleeve 13 to a suitable position, and control the control ring 31 and the inner conical ring 29 to move together with the carrier tube 15. The carrier tube 15 and the hollow pin 27 maintain a transmission relationship.

[0043] Start the motor. The carrier tube 15 is controlled to rotate by the transmission device, and the auger 17 rotates together with the carrier tube 15. The carrier tube 15 drives the diameter-changing ring 19 to rotate through the hollow pin 27. Due to the friction between the friction plate 28 and the fixed sleeve 13, the limit ring 20 does not rotate temporarily, and the limit member 25 and the cutter head 18 do not rotate. Under the influence of the arc-shaped groove 33, the guide pin 35 moves away from the magnetic sleeve 26, and the slide bar 36 and the slide groove 32 slide, and the cutter head 18 slides together with the limit member 25 to achieve the purpose of changing the diameter and expanding the effective range of the cutter head 18 for rotary cutting the thrombus.

[0044] The effective range of the cutter head 18 for rotary cutting is affected by the distance between the wedge-shaped protrusion 37 and the wedge-shaped groove 38. Refer to the Figure 7, from this perspective, when there is an overlapping part between the wedge-shaped bump 37 and the wedge-shaped groove 38, the farther the wedge-shaped groove 38 moves to the right, the farther the wedge-shaped bump 37 is allowed to move upward; in the perspective shown in Figure 6 , that is, the longer the control ring 31 follows the length of the extraction of the bearing tube 15, the greater the limit range allowed for the four limit members 25 to expand radially outwards.

[0045] When the four cutting heads 18 are fully expanded and cannot be further expanded, the attitude of the rotary cutting mechanism 11 reaches the requirement of the set diameter change. At this time, the motor continues to control the rotation of the bearing tube 15, and the bearing tube 15 drives the diameter-changing ring 19 to rotate together. Since the limit members 25 cannot continue to displace relative to the diameter-changing ring 19, the multiple limit members 25 will move together with the diameter-changing ring 19, and the four cutting heads 18 will start to rotate together with the diameter-changing ring 19 to perform rotary cutting on the thrombus. At this time, the limit ring 20 and the friction plate 28 are also forced to rotate synchronously, and the friction plate 28 and the rotating sleeve 12 rotate relative to each other, and the friction between them is overcome.

[0046] During the above process, the rotating sleeve 12 rotates together with the diameter-changing ring 19. When the kidney-shaped hole 22 and the special-shaped hole 23 are aligned, the shredded thrombus will come into contact with the rotating auger 17 and be drawn out of the patient's body by the auger 17. The rotating sleeve 12 and the fixed sleeve 13 rotate relative to each other, and the sewage suction port 14 is in a periodically cut-open and closed state to intermittently suck the shredded thrombus, which is transported through the space between the fixed sleeve 13 and the bearing tube 15 and collected by the sewage collection device.

[0047] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, terms such as "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0048] The above content is only an example and explanation of the structure of the present invention. Those skilled in the art of this technology can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined by the claims of the present invention, they should fall within the protection scope of the present invention.

Claims

1. A variable diameter mechanical thrombus removal system, characterized in that: It comprises a rotary cutting mechanism, a rotating sleeve connected to the rotary cutting mechanism and rotating synchronously, a fixed sleeve rotatably arranged inside the rotating sleeve and used for aspirating thrombus, a supporting tube arranged inside the fixed sleeve and drivingly connected to the rotary cutting mechanism, and a guide wire passing through the supporting tube and the rotary cutting mechanism; The rotary cutting mechanism includes a plurality of cutter heads distributed in a circular array, a reducing ring slidably connected to the plurality of cutter heads respectively, a limiting ring arranged on the side of the reducing ring away from the cutter heads and used to limit the radial sliding of the cutter heads, and a control ring arranged on the side of the limiting ring away from the reducing ring and used to limit the maximum radial sliding distance of the cutter heads.

2. The variable diameter mechanical thrombus removal system according to claim 1, characterized in that: An auger located inside the fixing sleeve is fixedly provided on the peripheral side of the supporting tube, and one end of the supporting tube away from the rotary cutting mechanism is connected to a driving device, and the driving device is used to drive the supporting tube to rotate relative to the guide wire.

3. The variable diameter mechanical thrombus removal system according to claim 1, characterized in that: It also includes a sewage suction port, which includes a waist-shaped hole arranged on the side wall of the rotating sleeve and a special-shaped hole arranged on the side wall of the fixed sleeve, and the edge of the special-shaped hole is toothed.

4. The variable diameter mechanical thrombectomy system according to claim 1, characterized in that: A hollow pin is fixedly provided at one end of the reducing ring close to the supporting tube, the hollow pin is spline-connected to the supporting tube, and the control ring is fixedly connected to the supporting tube.

5. The variable diameter mechanical thrombus removal system according to claim 4, characterized in that: A magnetic sleeve is fixedly provided at one end of the reducer ring away from the hollow pin, and fitting grooves are respectively provided at one end of the plurality of cutter heads close to the reducer ring. The magnetic sleeve attracts the plurality of cutter heads to gather together so that the fitting grooves fit with the magnetic sleeve.

6. The variable diameter mechanical thrombus removal system according to claim 5, characterized in that: The reducer ring is provided with a plurality of arc grooves corresponding to the plurality of cutter heads one by one, the distances from the two ends of the arc groove to the axis of the reducer ring are not equal, and a limit member is slidably provided in each of the arc grooves; the limit member includes a guide pin, a mounting plate and a slide bar respectively fixedly arranged at the two ends of the guide pin; the mounting plate and the slide bar are respectively located at the two ends of the reducer ring, and the mounting plate is fixedly connected to a corresponding one of the cutter heads.

7. The variable diameter mechanical thrombus removal system according to claim 6, characterized in that: The supporting tube passes through the limiting ring, and a plurality of sliding grooves are provided at one end of the limiting ring close to the reducing ring. The sliding bar is slidably connected to a corresponding one of the sliding grooves. A friction plate is provided on the circumferential side of the limiting ring, and the friction plate is in contact with one end of the fixing sleeve close to the rotary cutting mechanism. The limiting ring has a tendency to remain relatively still with the fixing sleeve, and after overcoming the friction between the friction plate and the fixing sleeve, the limiting ring can rotate relative to the fixing sleeve.

8. The variable diameter mechanical thrombus removal system according to claim 7, characterized in that: An inner conical ring is fixedly provided on the circumferential side of the control ring, and the end of the inner conical ring along the cross-section of the control ring through the axis is in the shape of a wedge-shaped groove, and the end of the slide bar away from the magnetic sleeve is in the shape of a wedge-shaped protrusion, and the wedge-shaped protrusion cooperates with the wedge-shaped groove, and the maximum sliding distance of the limit member relative to the reducer ring is directly proportional to the distance between the wedge-shaped protrusion and the wedge-shaped groove.

9. The variable diameter mechanical thrombus removal system according to claim 1, characterized in that: One end of the rotating sleeve close to the rotary cutting mechanism is fixedly connected to the reducing ring. The multiple rotary cutting mechanisms are gathered to form a cone shape, and the bottom surface diameter of the gathered rotary cutting mechanism is smaller than the diameter of the rotating sleeve.

10. The variable diameter mechanical thrombus removal system according to claim 9, characterized in that: The synchronous movement of the support tube and the fixing sleeve can control the variable diameter mechanical thrombus removal system to move to different working positions as a whole, and the thrombus removal position can be adjusted by reciprocating the support tube and the fixing sleeve.

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