Variable diameter mechanical thrombectomy system

Abstract

The utility model discloses a variable diameter mechanical thrombus rotary cutting system, including rotary cutting mechanism, with the rotary cutting mechanism is connected and synchronous rotation's rotation cover, rotates and sets up in the rotation cover inside and is used for the fixed cover of aspiration thrombus, sets up in the fixed cover inside with the transmission connection of rotary cutting mechanism's bearing tube, the guide wire of through bearing tube and rotary cutting mechanism, when contacting different size blood vessel, need not to use different specification cutter head, through the rotational speed of cutter head makes rotary cutting mechanism open to the diameter of demand, before cutter head is in position, and cutter head is gathered state, can effectively prevent the blood vessel scratch, improves the success rate of operation.

Description

Technical Field

[0001] This invention belongs to the field of thrombectomy technology, specifically relating to a variable-diameter mechanical thrombectomy system. Background Technology

[0002] Mechanical thrombectomy devices are used for the removal and extraction of peripheral arterial thrombi and plaques. In existing technologies, the rotary cutting head needs to be selected according to the thickness of the blood vessel and the degree of thrombus blockage. In actual operation, due to the influence of the actual condition of the blood vessel, the cutting head needs to be changed frequently to ensure that the blood vessel wall is not scratched and the thrombus is effectively removed. Utility Model Content

[0003] In order to solve the above-mentioned problems in the existing technology, the purpose of this utility model is to provide a variable diameter mechanical thrombus excision system.

[0004] The technical solution adopted in this utility model is as follows:

[0005] A variable-diameter mechanical thrombectomy system includes a thrombectomy mechanism, a rotating sleeve connected to and rotating synchronously with the thrombectomy mechanism, a fixed sleeve rotatably disposed inside the rotating sleeve for aspirating thrombi, a carrier tube disposed inside the fixed sleeve and drivenly connected to the thrombectomy mechanism, and a guide wire penetrating the carrier tube and the thrombectomy mechanism.

[0006] The rotary cutting mechanism includes multiple cutters arranged in a ring array, a variable diameter ring slidably connected to each of the multiple cutters, and a limiting ring disposed on the side of the variable diameter ring away from the cutters to limit the radial sliding of the cutters; the variable diameter range of the rotary cutting mechanism is controlled by the rotation speed of the cutters.

[0007] As a preferred embodiment of this utility model, a screw conveyor located inside the fixed sleeve is fixedly provided on the periphery of the carrying tube, and the end of the carrying tube away from the rotary cutting mechanism is connected to the driving device, which is used to drive the carrying tube to rotate relative to the guide wire.

[0008] As a preferred embodiment of this utility model, it also includes a suction port, which includes a waist-shaped hole provided on the side wall of the rotating sleeve and an irregularly shaped hole provided on the side wall of the fixed sleeve, wherein the edge of the irregularly shaped hole is toothed.

[0009] As a preferred embodiment of this utility model, a hollow pin is fixedly provided at one end of the variable diameter ring near the bearing tube, and the hollow pin is splinedly connected to the bearing tube.

[0010] As a preferred embodiment of this utility model, a magnetic sleeve is fixedly provided at the end of the variable diameter ring away from the hollow pin, and a plurality of cutting heads are respectively provided with fitting grooves at the ends of the multiple cutting heads near the variable diameter ring. The magnetic sleeve attracts the multiple cutting heads to gather together so that the fitting grooves fit with the magnetic sleeve.

[0011] As a preferred embodiment of this invention, the variable diameter ring is provided with a plurality of arc-shaped grooves corresponding one-to-one with the plurality of cutter heads. The distances from the two ends of the arc-shaped grooves 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 guide pin, a mounting plate and a slide bar respectively fixedly disposed at both ends of the guide pin. The mounting plate and the slide bar are respectively located at both ends of the variable diameter ring, and the mounting plate is fixedly connected to a corresponding cutter head.

[0012] As a preferred embodiment of this utility model, the bearing tube passes through the limiting ring, and the limiting ring is provided with a plurality of sliding grooves at one end near the variable diameter ring. The sliding strip is slidably connected to one of the corresponding sliding grooves. A friction plate is provided on the periphery of the limiting ring, and the friction plate contacts the end of the fixed sleeve near the rotary cutting mechanism. The limiting ring tends to remain relatively stationary with the fixed sleeve. After overcoming the friction between the friction plate and the fixed sleeve, the limiting ring can rotate relative to the fixed sleeve.

[0013] Advantageously, the synchronous movement of the carrier tube and the fixing sleeve can control the overall movement of the variable diameter mechanical thrombectomy system to different working positions, and the thrombectomy position can be adjusted by reciprocating the movement of the carrier tube and the fixing sleeve.

[0014] The beneficial effects of this utility model are as follows: As a variable diameter mechanical thrombectomy system, this utility model does not require the use of different specifications of blades when contacting blood vessels of different sizes. The rotation speed of the blades causes the cutting mechanism to open to the required diameter. Before the blades are in place, the blades are in a converged state, which can effectively prevent the blood vessels from being scratched and improve the success rate of the operation. Attached Figure Description

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a utility model Figure 1 A schematic diagram of the side view structure;

[0018] Figure 3 This is a utility model Figure 2 A schematic diagram of the AA-direction structure;

[0019] Figure 4This is a utility model Figure 1 A schematic diagram of the rotary cutting mechanism;

[0020] Figure 5 This is a utility model Figure 1 A schematic diagram of the exploded structure;

[0021] Figure 6 This is a utility model Figure 5 A magnified structural diagram at point B;

[0022] Figure 7 This is a utility model Figure 6 A schematic diagram of the fitting principle of the limiting component and the control ring under the cross section. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0025] The following is combined with Figure 1-7 This invention describes specific embodiments of the present invention, Example 1:

[0026] A variable diameter mechanical thrombectomy system includes a thrombectomy mechanism 11, a rotating sleeve 12 connected to and rotating synchronously with the thrombectomy mechanism 11, a fixed sleeve 13 rotatably disposed inside the rotating sleeve 12 for aspirating thrombi, a carrier tube 15 disposed inside the fixed sleeve 13 and drivenly connected to the thrombectomy mechanism 11, and a guide wire 16 penetrating the carrier tube 15 and the thrombectomy mechanism 11.

[0027] The rotary cutting mechanism 11 includes multiple cutter heads 18 arranged in a ring array, a diameter-changing ring 19 slidably connected to each of the cutter heads 18, and a limiting ring 20 disposed on the side of the diameter-changing ring 19 away from the cutter heads 18 to limit the radial sliding of the cutter heads 18. The diameter-changing range of the rotary cutting mechanism 11 is controlled by the rotation speed of the cutter heads 18. The cutter heads 18 are held together in a static state by magnetic attraction. Within a certain range, the upper limit of the diameter-changing range is controlled by the rotation speed of the cutter heads 18; the faster the rotation speed, the larger the diameter of the rotary cutting mechanism 11 after rotation.

[0028] Example 2:

[0029] Unlike the above embodiments, the rotary cutting mechanism 11 also includes a control ring 31 disposed on the side of the limiting ring 20 away from the diameter changing ring 19, which is used to limit the maximum radial sliding distance of the cutter head 18, in order to replace the method of controlling the upper limit of the diameter change by rotation speed. Within a certain range, when the cutter head 18 rotates, the radius of the rotary cutting mechanism 11 can always reach the upper limit of the allowable diameter change.

[0030] Multiple blades 18 slide along the radius of the circle in which they are distributed in a ring array, i.e., radial sliding. The cutting radius of the blades 18 can be actively adjusted according to the size of the blood vessel and the degree of thrombosis, preventing the tip of the rotating blades 18 from damaging the blood vessel wall, greatly improving the success rate of the operation and reducing the risk of the operation.

[0031] Advantageously, a screw conveyor 17 located inside the fixing sleeve 13 is fixedly provided on the periphery of the support tube 15. The end of the support tube 15 away from the rotary cutting mechanism 11 is connected to a driving device, which is used to drive the support tube 15 to rotate relative to the guide wire 16. The driving device is a device such as a motor, which can drive the end of the support tube 15 located outside the patient's body to rotate. The guide wire 16 is flexible, and the area of ​​the support tube 15 not covered by the screw conveyor 17 is also flexible. The flexible support tube 15 can transmit torque in a bent state, thereby causing the entire support tube 15 to rotate around its own axis.

[0032] Advantageously, it also includes a suction port 14, which includes a waist-shaped hole 22 provided on the side wall of the rotating sleeve 12 and an irregularly shaped hole 23 provided on the side wall of the fixed sleeve 13. The edge of the irregularly shaped hole 23 is serrated. The irregularly shaped hole 23 remains stationary while the waist-shaped hole 22 rotates, causing the suction port 14 to open periodically. The serrations on the edge of the irregularly shaped hole 23 have a certain cutting and shredding effect, which can prevent large pieces of blood clots from entering the suction port 14 and prevent the carrier tube 15 from being blocked.

[0033] Advantageously, a hollow pin 27 is fixedly provided at one end of the variable diameter ring 19 near the bearing tube 15. The hollow pin 27 is splinedly connected to 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 rotate synchronously, and the two can slide relative to each other in the axial direction.

[0034] Advantageously, a magnetic sleeve 26 is fixedly provided at the end of the variable diameter ring 19 away from the hollow pin 27, and a plurality of cutting heads 18 are respectively provided with fitting grooves 24 at the ends near the variable diameter ring 19. The magnetic sleeve 26 attracts the plurality of cutting heads 18 to gather together, so that the fitting grooves 24 are fitted with the magnetic sleeve 26. When the cutting heads 18 are not rotating, the magnetic sleeve 26 will attract the cutting heads 18 to gather together. When the cutting heads 18 rotate, they overcome the magnetic force of the magnetic sleeve 26 and thus disperse.

[0035] Advantageously, the variable diameter ring 19 is provided with multiple arc-shaped grooves 33 corresponding one-to-one with the multiple cutter heads 18. The distances from the two ends of the arc-shaped grooves 33 to the axis of the variable diameter ring 19 are not equal. A limiting member 25 is slidably provided in each arc-shaped groove 33. The limiting member 25 includes a guide pin 35, a mounting plate 34 and a slide bar 36 respectively fixedly disposed at both ends of the guide pin 35. The mounting plate 34 and the slide bar 36 are respectively located at both ends of the variable diameter ring 19. The mounting plate 34 is fixedly connected to a corresponding cutter head 18. The rotation of the variable diameter ring 19 will change the distance between the guide pin 35 and the axis of the variable diameter ring 19, thereby realizing the diameter change of the multiple cutter heads 18. After the cutter head 18 rotates, under the action of centrifugal force, the cutter head 18 will always change its diameter to the maximum allowable diameter. The length of the arc-shaped groove 33 meets the requirements when the diameter of the cutter head 18 is at its maximum value.

[0036] Advantageously, the bearing tube 15 passes through the limiting ring 20. The limiting ring 20 has multiple sliding grooves 32 at one end near the variable diameter ring 19. The slide bar 36 is slidably connected to one of the corresponding sliding grooves 32. Friction plates 28 are provided on the periphery of the limiting ring 20. The friction plates 28 contact the end of the fixed sleeve 13 near the rotary cutting mechanism 11. The limiting ring 20 tends to remain relatively stationary with the fixed sleeve 13. After overcoming the friction between the friction plates 28 and the fixed sleeve 13, the limiting ring 20 can rotate relative to the fixed sleeve 13. With the cooperation of the sliding grooves 32 and the slide bar 36, the cutter head 18 is restricted to moving only radially along the variable diameter ring 19.

[0037] Advantageously, an inner conical ring 29 is fixedly provided on the periphery of the control ring 31. The inner conical ring 29 is wedge-shaped groove 38 at the end of the cross section of the control ring 31 through the axis. The end of the slide bar 36 away from the magnetic sleeve 26 is wedge-shaped protrusion 37. The wedge-shaped protrusion 37 and the wedge-shaped groove 38 cooperate. The maximum sliding distance of the limiting member 25 relative to the diameter-changing ring 19 is directly proportional to 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, thereby controlling the maximum allowable diameter of the cutter head 18 after diameter change.

[0038] Advantageously, the end of the rotating sleeve 12 near the rotary cutting mechanism 11 is fixedly connected to the variable diameter ring 19. Multiple rotary cutting mechanisms 11 converge into a conical shape, with the bottom diameter of the converged rotary cutting mechanism 11 being smaller than the diameter of the rotating sleeve 12. The diameter of the blade head 18 in its converged state is smaller than that of the rotating sleeve 12, thus ensuring that the blade head 18 moves within the blood vessel before being positioned, without causing damage to the blood vessel wall.

[0039] Advantageously, the synchronous movement of the carrier tube 15 and the fixing sleeve 13 can control the overall movement of the variable diameter mechanical thrombectomy system to different working positions, and the thrombectomy position can be adjusted by reciprocating the movement of the carrier tube 15 and the fixing sleeve 13.

[0040] Working principle of this utility model:

[0041] In the initial state, the guidewire 16 is first inserted into the patient's blood vessel with thrombus. After being inserted to a certain depth, the position and state of the guidewire 16 are kept unchanged. Then, under the guidance of the guidewire 16, the rotary cutting mechanism 11, the rotating sleeve 12, the fixing sleeve 13, and the carrier tube 15 are sent to the position where the thrombus needs to be removed.

[0042] As attached Figure 1 As shown, only a portion of the guidewire 16 is shown, with much longer ends. Similarly, only a portion of the fixing sleeve 13 and the carrier tube 15 are shown. The fixing sleeve 13 and the carrier tube 15 are respectively connected to the blood collection device and the motor drive device outside the patient's body.

[0043] Adjust the fixing sleeve 13 and the carrier tube 15 so that the rotary cutting mechanism 11 can accurately reach the position where the thrombus needs to be removed. According to the size of the blood vessel and the degree of blockage of the thrombus, design the appropriate rotary cutting range of the blade 18. According to the set result, by pushing and pulling the end of the carrier tube 15 located outside the patient's body, adjust the carrier tube 15 to move axially to the appropriate position relative to the fixing sleeve 13. The control ring 31 and the inner cone ring 29 move together with the carrier tube 15. The carrier tube 15 and the hollow pin 27 maintain a transmission relationship.

[0044] The motor is started, and the transmission device controls the rotation of the carrier tube 15. The auger 17 rotates together with the carrier tube 15. The carrier tube 15 drives the variable diameter ring 19 to rotate through the hollow pin 27. Due to the friction between the friction plate 28 and the fixed sleeve 13, the limiting ring 20 does not rotate temporarily. The limiting member 25 and the cutter head 18 do not rotate. Under the influence of the arc groove 33, the guide pin 35 moves away from the magnetic sleeve 26. The slide bar 36 and the slide groove 32 slide together. The cutter head 18 slides together with the limiting member 25 to achieve the purpose of changing the diameter and expand the effective range of the cutter head 18 to cut the thrombus.

[0045] The effective cutting range of the blade 18 is affected by the distance between the wedge-shaped protrusion 37 and the wedge-shaped groove 38. (See attached diagram.) Figure 7 From this perspective, when the wedge-shaped protrusion 37 and the wedge-shaped groove 38 overlap, the further the wedge-shaped groove 38 moves to the right, the further the wedge-shaped protrusion 37 is allowed to move upward; placed on the attached Figure 6 From the perspective of the control ring 31, the longer the length of the control ring 31 that is pulled out along with the bearing tube 15, the greater the limit range that the four limiting members 25 are allowed to expand radially in all directions.

[0046] When the four blades 18 have fully expanded and can no longer expand, the slicing mechanism 11 reaches the set diameter change requirement. At this time, the motor continues to control the bearing tube 15 to rotate, and the bearing tube 15 drives the diameter change ring 19 to rotate together. Since the limiting member 25 can no longer move relative to the diameter change ring 19, multiple limiting members 25 will move together with the diameter change ring 19. The four blades 18 begin to rotate together with the diameter change ring 19 to slice the thrombus. At this time, the limiting ring 20 and the friction plate 28 are also forced to rotate synchronously. The friction plate 28 and the rotating sleeve 12 rotate relative to each other, and the friction between them is overcome.

[0047] During the above process, the rotating sleeve 12 rotates together with the reducing ring 19. When the waist-shaped hole 22 and the irregular hole 23 are aligned, the shredded thrombus will come into contact with the rotating auger 17 and be pulled 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 suction port 14 periodically opens and closes to intermittently suction the shredded thrombus. The thrombus is transported through the space between the fixed sleeve 13 and the carrier tube 15 and collected by the blood collection device.

[0048] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0049] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims of this utility model, they should all fall within the protection scope of this utility model.

Claims

1. A variable-diameter mechanical thrombus excision system, characterized in that: It includes a rotary cutting mechanism, a rotating sleeve connected to and rotating synchronously with the rotary cutting mechanism, a fixed sleeve rotatably disposed inside the rotating sleeve and used for aspirating thrombi, a carrier tube disposed inside the fixed sleeve and drivenly connected to the rotary cutting mechanism, and a guide wire penetrating the carrier tube and the rotary cutting mechanism; The rotary cutting mechanism includes multiple cutters arranged in a ring array, a variable diameter ring slidably connected to each of the multiple cutters, and a limiting ring disposed on the side of the variable diameter ring away from the cutters to limit the radial sliding of the cutters; the variable diameter range of the rotary cutting mechanism is controlled by the rotation speed of the cutters.

2. The variable-diameter mechanical thrombectomy system according to claim 1, characterized in that: The circumference of the carrying tube is fixedly provided with an auger located inside the fixed sleeve. The end of the carrying tube away from the rotary cutting mechanism is connected to the driving device, which is used to drive the carrying tube to rotate relative to the guide wire.

3. The variable-diameter mechanical thrombectomy system according to claim 1, characterized in that: It also includes a suction port, which includes a waist-shaped hole on the side wall of the rotating sleeve and a non-circular hole on the side wall of the fixed sleeve, the edge of the non-circular hole being 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 variable diameter ring near the bearing tube, and the hollow pin is splinedly connected to the bearing tube.

5. The variable-diameter mechanical thrombectomy system according to claim 4, characterized in that: A magnetic sleeve is fixedly provided at the end of the variable diameter ring away from the hollow pin, and a plurality of cutting heads are respectively provided at the end of the variable diameter ring. The magnetic sleeve attracts the plurality of cutting heads to gather together so that the fitting groove is fitted with the magnetic sleeve.

6. The variable-diameter mechanical thrombectomy system according to claim 5, characterized in that: The variable diameter ring is provided with multiple arc-shaped grooves corresponding to the multiple cutter heads one by one. The distances from the two ends of the arc-shaped grooves 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 guide pin, a mounting plate and a slide bar respectively fixedly disposed at both ends of the guide pin. The mounting plate and the slide bar are respectively located at both ends of the variable diameter ring. The mounting plate is fixedly connected to a corresponding cutter head.

7. The variable-diameter mechanical thrombectomy system according to claim 6, characterized in that: The bearing tube passes through the limiting ring. The limiting ring has multiple sliding grooves at one end near the variable diameter ring. The slide bar is slidably connected to one of the corresponding sliding grooves. The limiting ring has friction plates on its periphery. The friction plates are in contact with the end of the fixed sleeve near the rotary cutting mechanism. The limiting ring tends to remain relatively stationary with the fixed sleeve. After overcoming the friction between the friction plates and the fixed sleeve, the limiting ring can rotate relative to the fixed sleeve.

8. The variable-diameter mechanical thrombectomy system according to claim 7, characterized in that: The synchronous movement of the carrier tube and the fixing sleeve can control the overall movement of the variable diameter mechanical thrombectomy system to different working positions, and the thrombectomy position can be adjusted by reciprocating the movement of the carrier tube and the fixing sleeve.

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