CN114010273B

CN114010273B - High-speed rotary grinding mechanism and intervention type rotary grinding device

Info

Publication number: CN114010273B
Application number: CN202011027774.5A
Authority: CN
Inventors: 沈斌
Original assignee: Jiaxing Jiangxin Medical Technology Co ltd
Current assignee: Jiaxing Jiangxin Medical Technology Co ltd
Priority date: 2020-09-25
Filing date: 2020-09-25
Publication date: 2022-11-22
Anticipated expiration: 2040-09-25
Also published as: CN114010273A

Abstract

The invention provides a high-speed rotary grinding mechanism and an interventional rotary grinding device, wherein the rotary grinding mechanism comprises a guide wire, a shaft assembly, an output joint, a track pipe assembly and a temperature detection assembly, the track pipe assembly comprises a sheath pipe in a cylindrical barrel structure, and a mounting hole which is axially communicated with the track pipe assembly is formed in the side wall of the track pipe assembly; the temperature detection assembly comprises a thermocouple detection end and a thermocouple wire which are connected with each other, the thermocouple wire is inserted into the mounting hole, and the thermocouple detection end extends out of the end part of the sheath tube; the shaft assembly comprises a rigid shaft and a flexible shaft which are connected with each other, the flexible shaft comprises an inner coil assembly and an outer coil assembly which are attached to each other and have opposite surrounding directions, and spring wires are welded and connected to the two ends of the flexible shaft; two or three rotary grinding layers are arranged at intervals on the flexible shaft to grind the same plaque, and one rotary grinding layer on the outermost side is positioned at the end part of the flexible shaft. The invention can be applied to a wider range of blood vessels and has higher operation safety.

Description

High-speed rotary grinding mechanism and insertion type rotary grinding device

Technical Field

The invention relates to the technical field of medical instruments, in particular to a high-speed rotary grinding mechanism and an intervention type rotary grinding device.

Background

The interventional medical equipment is a common equipment in the existing medical technology, such as atherosclerosis and other diseases, ischemic heart disease gradually becomes one of the more fatal diseases, and the main causes of the disease are atherosclerosis: fat, fiber and calcium deposit on the vessel wall to form plaque, which hinders the normal circulation of blood and causes the vessel to be blocked. In the prior art, intervention saccule and stent treatment are often adopted, and atherosclerotic plaques are pushed into blood vessel walls so as to dredge blood vessels and treat ischemic heart disease and peripheral artery diseases. However, for the seriously calcified lesion and the lesion of a special part, such as a joint, because the inner space of the lesion is too narrow, the balloon and the stent can not be completely opened in the calcified blood vessel, and the ideal treatment effect is difficult to achieve. In view of the foregoing, a clinical approach to atherectomy to remove heavily calcified plaque has been proposed in the prior art, and accordingly an interventional atherectomy device has been developed that extends into the vessel through a flexible shaft with an atherectomy layer that ablates the plaque by rotating it to increase the available space in the vessel.

The flexible shaft of the existing interventional type rotational grinding device is usually made of a spirally wound steel wire, a rotational grinding head is connected onto the flexible shaft, the diameter of the rotational grinding head generally has multiple sizes, in a surgical operation, the rotational grinding head with a smaller diameter is often used for performing rotational grinding drilling on a plaque, and then the eccentric rotational grinding head with a larger diameter is replaced for performing rotational grinding. There are also some technologies to improve the flexible shaft and the rotational grinding head, for example, patent US20170262035A1 discloses that a rotational grinding head is disposed on the spiral wound transmission shaft, which is disposed on the outer side of the flexible shaft and is eccentric or symmetrical, the symmetrical rotational grinding head can be in a shuttle shape or a plurality of spaced grinding material layers, and in this patent, a temperature detection assembly is further disposed on the sheath tube protecting the transmission shaft to detect the temperature of the medium flowing out of the sheath tube, but in order to have enough space to install the temperature detection assembly, the sheath tube is disposed in a special-shaped structure to install the whole temperature detection assembly in the side wall of the sheath tube. For another example, US355848333A discloses a three-wire spiral-wound transmission shaft provided with a plurality of rotational heads, however, in these techniques, the eccentric and shuttle-shaped rotational heads have a large volume and have a large impact on blood vessels; the diameters of the rotary grinding heads are larger, and the large-diameter rotary grinding heads are continuously used, so that the grinding force is larger, and the impact on blood vessels is also larger; when the rotary grinding head rotates at a high speed, grinding dust under grinding is difficult to discharge as soon as possible, and the rotary grinding head can be blocked. For the structure of a plurality of rotary grinding heads, different plaques are ground simultaneously, and the rotary grinding heads can affect each other and are not easy to control. And the special-shaped sheath structure is adopted, so that the rigidity of the sheath is increased, and the flexibility and completeness of the sheath in the blood vessel are limited.

In addition, the flexible shaft is usually made of a spirally wound steel wire, which has a certain rigidity when it rotates around its own axis in the spiral direction, and in order to increase the torque transmission, a flexible shaft wound with three layers of independent coils is disclosed in patent US20150060728A1, which has a larger rigidity and can transmit the torque better. But also brings more problems, the rigidity is increased, the flexibility is poor, when the rotary grinding head rotates, the rotary grinding head is driven to basically rotate around the rotary grinding head, and the grinding is basically carried out at a certain position on the circumference of the blood vessel all the time, so that the temperature at the position is quickly increased, and the influence on blood is large; the structure has poor flexibility and is not beneficial to passing through the blood vessel; at the same time, the three-layer structure necessarily increases the diameter of the whole flexible shaft, so that the flexible shaft is not easy to pass through the blood vessel and is also difficult to move in the circumferential direction of the blood vessel. However, in any case, the end of the flexible shaft is also prone to loosening when rotating at a high speed, and a protective sleeve is often required to be connected to the distal end side of the flexible shaft, so that when the flexible shaft extends into a blood vessel, the protective sleeve at the end of the flexible shaft contacts with a plaque first, and in the initial contact period, the flexible shaft does not have grinding force on the plaque, so that the contact force between the flexible shaft and the plaque is too large, and the large impact on the blood vessel affects the transmission of torque.

Disclosure of Invention

Based on the above situation, the present invention is directed to a high-speed rotational grinding mechanism and an intervention type rotational grinding device, so as to solve the technical problems of the rotational grinding device in the prior art.

In order to realize the purpose, the technical scheme adopted by the invention is as follows:

the invention provides a high-speed rotary grinding mechanism which is used for an intervention type rotary grinding device, wherein the intervention type rotary grinding device comprises a shell, a cooling pipeline and a driving mechanism, the driving mechanism comprises a driving motor, a driving gear connected with the driving motor and a transmission gear meshed with the driving gear, and the driving motor is arranged in the shell in a sliding mode along a direction parallel to a driving shaft of the driving motor;

the rotary grinding mechanism comprises a guide wire, a shaft assembly in a hollow structure, an output joint arranged in the shell, a track pipe assembly and a temperature detection assembly; the output joint is of a hollow structure, one end of the output joint forms a cooling medium output port, and the side wall of the output joint is provided with a cooling medium input port connected with the cooling pipeline; the rail pipe assembly comprises a sheath pipe in a cylindrical structure, one end of the sheath pipe is connected with the cooling medium output port, the other end of the sheath pipe extends out of the shell, and a mounting hole which is communicated along the axial direction of the sheath pipe is formed in the side wall of the sheath pipe; the temperature detection assembly comprises a thermocouple detection end and a thermocouple wire which are connected with each other, the thermocouple wire is inserted into the mounting hole, and the thermocouple detection end extends out of the end part of the sheath tube;

the guide wire is arranged through the shaft assembly; the shaft assembly comprises a rigid shaft connected with the transmission gear in an inserted mode and a flexible shaft connected with the rigid shaft and partially extending out of the shell, the flexible shaft comprises an inner coil group and an outer coil group which are arranged in a fit mode, the inner coil group comprises a plurality of inner spring wires which are spirally wound and mutually fitted, the outer coil group comprises a plurality of outer spring wires which are spirally wound on the outer surface of the inner coil group and mutually fitted, the spiral winding directions of the outer spring wires and the inner spring wires are opposite, the outer spring wires are mutually welded and connected at two ends of the flexible shaft, the inner spring wires are mutually welded and connected, and the inner coil group and the outer coil group are connected in a welded mode; the part of the flexible shaft, which is far away from the rigid shaft, forms a rotational grinding area, two or three rotational grinding layers which circumferentially surround the flexible shaft are arranged on the outer surface of the outer layer coil group at intervals in the rotational grinding area so as to grind the same plaque, and one rotational grinding layer on the outermost side is positioned at the end part of the flexible shaft; the flexible shaft is inserted into the output joint and the sheath pipe in a sliding mode, and the rotary grinding layer can extend out of one end, far away from the shell, of the sheath pipe.

Preferably, the temperature detection assembly is a T-type thermocouple.

Preferably, the output connector comprises a pipe body, a first flange and a second flange, wherein the first flange and the second flange are connected to two ends of the pipe body; the second flange is positioned on the outer side of the shell, and a cooling medium output port of the output joint is arranged on one side, away from the pipe body, of the second flange; the cooling medium input port is arranged on the pipe body.

Preferably, the track pipe assembly further comprises a motor supporting pipe, a first fixing supporting pipe and a second fixing supporting pipe which are positioned in the shell, and the motor supporting pipe is fixed on the driving mechanism; one end of the first fixing support pipe is fixedly connected with one end, far away from the sheath pipe, of the output connector, and the other end of the first fixing support pipe is in sliding fit with the motor support pipe; one end of the second supporting tube is inserted into one end, far away from the rotary grinding layer, of the shaft assembly in a sliding mode, and the other end of the second supporting tube is fixed at the rear end of the shell.

Preferably, the temperature detection assembly further comprises an indicator light, and the indicator light is connected with the thermocouple wire so as to control the indicator light to display different colors according to the temperature of the temperature detection assembly.

Preferably, the rotary grinding layer is of a cylindrical structure, and the outer diameter of the rotary grinding layer is 0.7-0.9 mm; the thickness is 120-200 um; the length of each rotary grinding layer is 1.2-4mm, and the distance between two adjacent rotary grinding layers is 2-5 mm.

Preferably, the rotary grinding layer comprises a nickel matrix covering the outer surface of the flexible shaft and abrasive grains uniformly distributed on the nickel matrix, and the abrasive grains are diamond abrasive grains or CBN abrasive grains; the grain diameter of the abrasive grains is 10-50 um, the density is 500-2000 grains/square millimeter, and the height of the abrasive grains protruding out of the nickel matrix is 10-20 um.

Preferably, the outer diameter of the flexible shaft is 0.6-0.8 mm; the diameter of the outer layer spring wire is 0.1-0.15 mm; the diameter of the inner layer spring wire is 0.05-0.1 mm.

The invention provides an intervention type rotational grinding device, which comprises a shell, a cooling pipeline arranged in the shell, a driving mechanism and the high-speed rotational grinding mechanism, wherein the output joint is of a hollow structure, and a cooling medium input port connected with the cooling pipeline is arranged on the side wall of the output joint; the driving mechanism is arranged in the shell in a sliding manner and comprises a driving motor, a driving gear connected with the driving motor and a transmission gear meshed with the driving gear, and the driving motor is arranged in the shell in a sliding manner along the direction parallel to the driving shaft of the driving motor; and one end of the flexible shaft, which is far away from the rotary grinding layer, is connected with the transmission gear.

Preferably, the housing is provided with a display window; the insertion type rotational grinding device further comprises a display screen which is arranged on the shell and exposed out of the display window, and the thermocouple wire is connected with the display screen so as to display the temperature sensed by the temperature detection assembly on the display screen.

The high-speed rotational grinding mechanism is characterized in that a rotational grinding layer is directly arranged on the outer surface of the flexible shaft to form a rotational grinding head, the volume of the whole rotational grinding head is smaller, so that even if a plaque is larger, the rotational grinding head can easily reach the center of the plaque, during an operation, the shaft assembly rotates at a high speed, the rotational grinding head rotates around the axis of the shaft assembly due to the fact that the volume and the mass of the whole rotational grinding head are smaller, the rotation of the rotational grinding head can drive surrounding blood to move, and a formed fluid pressure field can push the rotational grinding head to circumferentially rotate around the inner wall of a blood vessel (specifically a cavity formed by the plaque and the inner wall of the blood vessel) so as to reduce heat concentration at the rotational grinding position. Meanwhile, the side wall of the sheath tube is provided with the mounting hole, the temperature detection assembly adopts the thermocouple, only the thermocouple wire is mounted in the mounting hole, and the detection end of the thermocouple is exposed out of the mounting hole, so that when a cooling medium in the sheath tube flows out, the thermocouple can detect the temperature of the sheath tube, various parameters and the like in the operation are adjusted and controlled according to the temperature, the temperature in the operation is ensured to be always kept in a safe range, and the safety of the operation is improved. Because the thermocouple detection end is positioned at the outer side of the sheath tube, the temperature of the cooling medium reaching the grinding position can be more accurately detected when the cooling medium flows out of the sheath tube, namely, the temperature detection precision of the temperature detection assembly is improved; meanwhile, the sheath tube adopts a cylindrical structure, and compared with a special-shaped structure, the sheath tube has better flexibility, can better adapt to the curved path of a blood vessel, can particularly improve the applicable blood vessel range of a rotational abrasion mechanism, and can flexibly stretch into the blood vessel even if the blood vessel is in a three-branch shape; since the thermocouple wire is mounted in the mounting hole, the requirement for the thickness of the side wall of the sheath tube is small, and the flexibility of the sheath tube can be improved.

Furthermore, the present invention employs a plurality of rotational atherectomy layers to form a flexible structure for grinding plaque at the same location, and can use different abrasive atherectomy layers for grinding while the drive shaft is moving forward and backward, so that the range of vessel diameters for use with an interventional rotational atherectomy device can be increased, and the present invention can also be applied to more complex vessel structures, such as the rotational atherectomy of a bifurcation vessel. And a gap is reserved between the adjacent rotary grinding layers, so that abrasive dust can be discharged quickly, and the rotary grinding hair can be prevented from being blocked.

Furthermore, the flexible shaft is arranged into a reversely-surrounding double-layer structure, so that the transmission of torque can be increased, the flexibility of the flexible shaft can be improved, the structure with two layers of opposite winding is adopted, even if the rotary grinding head is blocked, the flexible shaft can be rotated reversely to enable the flexible shaft to be easier to withdraw from the blocked position, and the flexible shaft can be well prevented from loosening due to the interaction of the spring wires on the inner layer and the outer layer. Furthermore, the two ends of the flexible shaft are respectively welded and connected, so that the inner layer and the outer layer can be better prevented from being loosened when the flexible shaft rotates at high speed, a protective sleeve is omitted, and the end part of the flexible shaft is provided with the rotary grinding layer.

Other advantages of the present invention will be described in the detailed description, and those skilled in the art will understand the technical features and technical solutions presented in the description.

Drawings

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic structural diagram of an embodiment of an interventional rotational atherectomy device according to the present invention;

FIG. 2 is an exploded view of a preferred embodiment of the interventional rotational atherectomy device provided in accordance with the present invention;

FIG. 3 is a cross-sectional view of a preferred embodiment of the interventional rotational atherectomy device provided in accordance with the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 3 at I;

FIG. 5 is an enlarged view of a portion of FIG. 3 at II;

FIG. 6 is a schematic structural diagram of a preferred embodiment of the orbital tube assembly of the interventional milling device of the present invention;

FIG. 7 is an enlarged view of a portion of FIG. 6 at III;

FIG. 8 is a schematic structural diagram of a preferred embodiment of a shaft assembly in the interventional rotational atherectomy device of the present invention.

In the figure:

10. a housing; 11. a chute; 12. a bottom case; 13. a shell cover; 14. a card slot; 15. a connecting plate; 16. displaying a window; 17. a scram switch;

20. a drive mechanism; 21. a drive motor; 22. a drive gear; 23. a transmission gear; 24. a guide rail; 25. a motor supporting seat;

30. a rotary grinding mechanism; 31. a guide wire; 32. a shaft assembly; 321. a rigid shaft; 322. a flexible shaft; 3221. an inner coil assembly; 3222. an outer coil group; 323. spin-grinding the layer; 33. a track tube assembly; 331. a sheath tube; 332. a motor supporting tube; 333. a first support tube; 334. a second support tube; 34. a temperature detection assembly; 341. a thermocouple detection end; 342. a thermocouple wire; 343. an indicator light; 35. an output connector; 351. a cooling medium inlet; 352. a pipe body; 353. a first flange; 354. a second flange; 355. a cooling medium outlet; 356. bonding glue;

40. a cooling pipeline;

50. a control circuit board;

60. a display screen.

Detailed Description

The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth in order to avoid obscuring the nature of the present invention, well-known methods, procedures, and components have not been described in detail.

Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".

In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

The application provides an interventional rotational atherectomy device, which can be used for treating cardiovascular diseases and the like to carry out atherectomy. As shown in fig. 1 to 8, the interventional type rotational grinding device comprises a housing 10, a cooling pipeline 40 driving mechanism 20 and a high-speed rotational grinding mechanism 30 connected with the driving mechanism 20, wherein the driving mechanism 20 comprises a driving motor 21, a driving gear 22 connected with the driving motor 21 and a transmission gear 23 meshed with the driving gear 22, and the diameter of the driving gear 22 is larger than that of the transmission gear 23 so as to realize high-speed rotation of the rotational grinding mechanism through gear meshing transmission. The drive mechanism 20 is slidably mounted in the casing 10 in a direction parallel to the drive shaft of the drive motor 21 itself.

The rotational grinding mechanism 30 includes a guide wire 31, a shaft assembly 32 having a hollow structure, an output joint 35 installed in the front end of the housing 10, a rail pipe assembly 33, and a temperature detection assembly 34, with reference to fig. 5-7, the output joint 35 has a hollow structure for the shaft assembly 32 to pass through, one end of which is open to form a cooling medium output port 355, and a cooling medium input port 351 connected to the cooling pipeline 40 is provided on the side wall of the output joint to input the cooling medium to the output joint 35 through the cooling pipeline 40 and then to flow out through the cooling medium output port 355. The track tube assembly 33 includes a sheath tube 331 having a cylindrical structure, the sheath tube 331 is disposed at the front end of the housing 10, one end of the sheath tube 331 is connected to the cooling medium output port 355 of the output connector 35, the other end of the sheath tube extends out of the housing 10, and a mounting hole penetrating along the axial direction of the sheath tube 331 is disposed on the side wall of the sheath tube 331. The temperature detecting unit 34 includes a thermocouple detecting end 341 and a thermocouple wire 342 connected to each other, the thermocouple wire 342 is inserted into the mounting hole, and the thermocouple detecting end 341 extends out of the mounting hole, so that the thermocouple detecting end 341 is exposed out of the end of the sheath tube 331, and one end of the thermocouple wire 342 far away from the thermocouple detecting end 341 extends toward the inside of the housing 10, and is further connected to a control circuit board 50 (described in detail below) of the insertion-type rotational polishing apparatus.

The guide wire 31 is threaded through the hollow structure of the shaft assembly 32 so that the shaft assembly 32 can slide along the guide wire 31. The shaft assembly 32 comprises a rigid shaft 321 connected with the transmission gear 23 in a plugged-in manner and a flexible shaft 322 connected with the rigid shaft 321 and partially extending out of the housing 10, the rigid shaft 321 is in interference fit with the transmission gear 23 to transmit the power of the driving motor 21 to the shaft assembly 32, and the axial direction of the rigid shaft 321 is parallel to the sliding direction of the driving mechanism 20, specifically, the axial direction of the driving shaft of the driving motor 21 and the axial direction of the rotating shaft of the transmission gear 23. The flexible shaft 322 comprises an inner coil group 3221 and an outer coil group 3222 which are arranged in an attaching manner and are in interference fit with each other, the inner coil group 3221 comprises a plurality of strands of inner spring wires which are spirally wound and attached to each other, the outer coil group 3222 comprises a plurality of strands of outer spring wires which are spirally wound on the outer surface of the inner coil group 3221 and attached to each other, the spiral winding directions of the outer spring wires and the inner spring wires are opposite, that is, the inner coil group 3221 is formed by tightly winding each inner spring wire, the outer coil group 3222 is formed by tightly winding each outer spring wire, and if the outer spring wires are wound in a right-handed manner, the inner spring wires are wound in a left-handed manner; if the outer layer spring wire is wound in a left-handed mode, the inner layer spring wire is wound in a right-handed mode; and at the both ends of flexible axle 322, each outer spring silk is welded connection each other, and each inner spring silk is welded connection each other, and inner coil group 3221 and outer coil group 3222 welded connection simultaneously, namely at the both ends of flexible axle 322, all spring silk all weld together, can specifically polish after the welding to make its terminal surface level, the surface is smooth.

Wherein, the portion of the flexible shaft 322 far from the rigid shaft 321 forms a rotational grinding area to grind the plaque at the same position, in the rotational grinding area, two or three rotational grinding layers 323 circumferentially surrounding the flexible shaft 322 are arranged at intervals on the outer surface of the outer layer coil group 3222, and the outermost one rotational grinding layer 323 is located at the end of the flexible shaft 322, that is, in the rotational grinding area, a plurality of rotational grinding layers 323, such as two, three or more, are arranged at intervals on the outer surface of the flexible shaft 322 to grind the plaque at the same position, each rotational grinding layer 323 covers the whole circumferential direction of the flexible shaft 322 to form a rotational grinding head, and two adjacent rotational grinding layers 323 and the flexible shaft 322 located between the two rotational grinding layers 323 form a gap, among the rotational grinding layers 323, one rotational grinding layer 323 is located at the end of the flexible shaft 322, that is, the end face of the rotational grinding layer 323 is coplanar with the end face (the face far from the rigid shaft 321) of the flexible shaft 322. The entire flexible shaft 322 is slidably inserted into the output connector 35 and the sheath 331.

In the high-speed rotational grinding mechanism 30, the rotational grinding layer 323 is directly arranged on the outer surface of the flexible shaft 322 to form a rotational grinding head, the volume of the entire rotational grinding head is small, and therefore, even if the plaque is large, the rotational grinding head can easily reach the center of the plaque, during the operation, the shaft assembly 32 rotates at a high speed, because the volume and the mass of the entire rotational grinding head are small, the rotational grinding head rotates around the axis of the shaft assembly 32, the rotation of the rotational grinding head can drive the surrounding blood to move, the formed fluid pressure field can push the rotational grinding head to circumferentially rotate around the inner wall of the blood vessel (specifically, a cavity formed by the plaque and the inner wall of the blood vessel), namely, the rotational grinding head revolves around the circumferential direction of the inner wall of the blood vessel while rotating around the axis, and as the amount of the plaque is ground is larger, the diameter of the cavity is larger and larger, the orbital diameter of the rotational grinding head is also gradually increased, so as to gradually grind the plaque. Although the interventional rotational atherectomy device is provided with the cooling pipeline 40, the cooling medium enters the output joint 35 through the cooling pipeline 40 and then flows into the blood vessel through the sheath 331 to cool the grinding position, in the process of high-speed grinding, friction is generated between the flexible shaft 322 and the guide wire 31 therein, when the cooling medium flows through, heat generated by the friction is transferred to the cooling medium, and the temperature of the cooling medium flowing out of the sheath 331 is increased. Since the thermocouple detection end 341 is located outside the sheath tube 331, the temperature of the cooling medium reaching the grinding position can be detected more accurately when the cooling medium flows out of the sheath tube 331, that is, the temperature detection accuracy of the temperature detection unit 34 is improved; meanwhile, the sheath tube 331 of the invention adopts a cylindrical structure, and compared with a special-shaped structure, the sheath tube 331 has better flexibility, thereby being capable of better adapting to the curved path of the blood vessel, particularly improving the applicable blood vessel range of the rotational abrasion mechanism 30, and being capable of flexibly extending into the blood vessel even if the blood vessel is in a bifurcation; since the thermocouple wire 342 is mounted in the mounting hole, the thickness of the side wall of the sheath 331 is required to be small, and the flexibility of the sheath 331 can be improved.

Meanwhile, the plurality of rotary grinding heads arranged at intervals form a flexible structure, so that the rotary grinding head can be applied to more complicated vascular structures, such as plaques at the position of a bifurcation blood vessel (usually, the large-diameter blood vessel and the small-diameter blood vessel are intersected with each other), the rotary grinding heads firstly carry out rotary grinding on part of plaques in the large-diameter blood vessel and then can directly enter the small-diameter blood vessel for rotary grinding, so that different rotary grinding heads are contacted with the plaques by sliding the flexible shaft 322 along the guide wire 31, the plaques in the area can be ground by adopting different rotary grinding heads, and the application range and the operation efficiency of the interventional rotary grinding device are further improved. In addition, in the process of high-speed rotation of the rotary grinding head, more grinding dust is generated, and if the grinding dust cannot be discharged as soon as possible, the rotation of the rotary grinding head can be blocked or even blocked.

In the prior art, the flexible shaft is generally in a single-layer spiral structure, even if the rotary grinding head structure is adopted, the rotary grinding head cannot be completely guaranteed not to be blocked or stuck, and when the rotary grinding head is blocked or stuck, if the rotary shaft assembly 32 is directly reversed, the flexible shaft can be loosened; and adopt this kind of double-deck reverse structure, relative three-layer structure of encircleing, can enough improve the pliability of flexible axle, can guarantee the transmission of moment of torsion again, the diameter of whole flexible axle 322 also can not too big moreover, is favorable to the motion in the blood vessel. Furthermore, the two ends of the flexible shaft 322 are respectively welded and connected, so that the spring wires at the two ends are integrated, the looseness of the inner layer, the outer layer and each layer of spring wires caused by the high-speed rotation and the reverse rotation of the flexible shaft 322 can be avoided as much as possible, the protective sleeve at the end part of the flexible shaft 322 is omitted, the reliability of the shaft assembly 32 is improved, and the assembly efficiency of the whole intervention type rotational grinding device is improved; meanwhile, the rotational grinding layer 323 is arranged at the end part of the flexible shaft 322, and in the initial contact stage of the flexible shaft 322 and the plaque, due to the grinding effect of the rotational grinding layer 323, the contact force between the flexible shaft 322 and the plaque can be reduced, and the impact of the flexible shaft 322 on the blood vessel can be reduced.

In addition, the rotational grinding mechanism 30 is configured to grind the plaque by the rotational grinding head in the circumferential direction by the revolution of the rotational grinding head, instead of grinding a certain position in the circumferential direction of the blood vessel all the time, thereby reducing the temperature rise of blood caused by the grinding as much as possible. On the other hand, the rotary grinding head is not required to be replaced in the operation, so that the operation time can be reduced, and the damage probability of replacing the rotary grinding head to blood vessels is reduced; moreover, although the shaft assembly 32 rotates at a high speed, because the rotational head rotates and revolves at the same time, and the volume and the mass of the rotational head are relatively small, compared with the rotational head with a large diameter, like the shuttle-shaped rotational head mentioned in the background art, the grinding force is relatively small, the amplitude can be reduced by more than 70%, the contact force with blood vessels is reduced, and the impact on the blood vessels is reduced; and the small-diameter rotary grinding layer structure can increase the range of the diameter of the blood vessel applied by the intervention type rotary grinding device, and meanwhile, the flexible small-diameter rotary grinding head is approximately circular in the area of the blood vessel rotary grinding, so that the whole rotary grinding process is stable, and calcified tissues can be effectively removed.

The temperature detection component is a T-shaped thermocouple which is a copper-constantan thermocouple, the measurement temperature range is-200-350 ℃, the heat transfer is fast in the temperature range, and the stability is good, so that the precision of temperature detection can be further improved, and the safety of the operation is improved.

The cooling medium can be physiological saline.

With continued reference to fig. 6, the output connector 35 includes a tube 352, a first flange 353 and a second flange 354 connected to two ends of the tube, wherein the first flange 353 is a square structure and is used for being clamped in the housing 10; the second flange 354 is located on the outer side of the housing 10, and the cooling medium outlet 355 of the output joint 35 is arranged on the side of the second flange 354 facing away from the pipe body 352; the cooling medium inlet 351 is provided in the pipe body 352, and the sheath 331 and the cooling medium outlet 355 are inserted and connected, specifically, they may be fixed by an adhesive 356 after being inserted. The first flange 353 adopts a square structure, so that the output connector 35 can be prevented from rotating in the installation process, and the positioning and installation with the shell 10 are facilitated; the second flange 354 is located outside the housing 10, and can not only provide a certain sealing function for the housing 10, but also facilitate the connection and fixation of the sheath 331 and the output connector 35.

As the driving mechanism 20 slides, the flexible shaft 322 slides relative to the housing 10, but the flexible shaft 322 is relatively flexible, and a portion inside the housing 10 may bend or otherwise fail during movement, and cannot slide along the axial direction of the rigid shaft 321, thereby increasing the difficulty of manipulation, for this reason, in a preferred embodiment of the present invention, the orbital tube assembly 33 further includes a motor support 332 tube, a first support tube 333 and a second support tube 334 inside the housing 10, the sheath tube 331, the motor support tube 332, the first support tube 333 and the second support tube 334 are coaxially disposed, and the sheath 331 can protect the flexible shaft 322 outside the housing 10 and facilitate entry of the flexible shaft 322 into the blood vessel. The motor support tube 332 is fixed to the driving mechanism 20, and can slide relative to the housing 10 along with the sliding of the driving mechanism 20, and when two motor supports 25 (described in detail below) are provided, two ends of the motor support tube 332 can be respectively inserted into and engaged with the two motor supports 25, and specifically can be in an interference fit. One end of the first supporting tube 333 is fixed to the front end of the housing 10, specifically to the end of the output connector 35 away from the cooling medium output port 355, and may be in interference fit, and the other end of the first supporting tube 333 is slidably inserted into the motor supporting tube 332; one end of the second support tube 334 is slidably inserted into one end of the rigid shaft 321 away from the flexible shaft 322, and the other end is fixed to the rear end of the housing 10, that is, the sheath tube 331, the output connector 35, the first support tube 333, the motor support tube 332, and the second support tube 334 are sequentially disposed, and the first support tube 333, the motor support tube 332, and the second support tube 334 are all located in the housing 10, and the motor support tube 332 is fixedly connected to the driving mechanism 20 and can slide together with the driving mechanism 20 relative to the housing 10, and the sheath tube 331, the first support tube 333, and the second support tube 334 are always in a stationary state relative to the housing 10, and in the sliding process of the driving mechanism 20, the motor support tube 332 and the first support tube 333 slide relative to each other, and the second support tube 334 and the rigid shaft 321 slide relative to each other, so that the rotational grinding area on the flexible shaft 322 extends out or retracts into the sheath tube 331. After the arrangement, the flexible shaft 322 is limited between the guide wire 31 and the track pipe assembly 33 in the whole movement process, the probability of uncontrollable bending, winding and other problems of the flexible shaft 322 is reduced, and the controllability of the whole interventional type rotational grinding device is improved.

Further, the temperature detecting assembly 34 further includes an indicator light 343, and the indicator light 343 is connected to the thermocouple wire 342, and may be directly connected or indirectly connected, and specifically may be connected to the control circuit board 50 (described in detail below) to control the indicator light 343 to display different states, such as different colors, according to the temperature detected by the temperature detecting assembly. After the setting, when the intervention type rotational abrasion device is in a normal working state and an abnormal working state, the control circuit board controls the indicator lamp 343 to display different states, so that the safety of the operation is improved in the reminding operation. Specifically, the indicator lamp 343 is a bicolor diode, and when the intrusive rotational grinding device is in a normal working state, the control indicator lamp 343 displays green, and when the intrusive rotational grinding device is in an abnormal working state, the control indicator lamp 343 displays red.

It is understood that the insertion type rotational grinding apparatus further includes a control circuit board 35, the control circuit board 35 is disposed in the housing 10, and the thermocouple wire 342 is connected to the control circuit board. The driving motor 21 is also connected to the control circuit board 35, and the indicator light 343 displays different states according to the rotation speed of the driving motor 21.

Specifically, it may be determined that the temperature data detected by the temperature detection assembly is at 4 ℃ or below, and the rotation speed of the driving motor 21 is in a normal operating state within a normal range; the temperature data detected by the temperature detection component exceeds 4 ℃, and the range of the rotating speed of the driving motor 21 exceeding the normal range is an abnormal working state. It should be noted that, in the embodiment of the driving mechanism 20 with a speed regulation function, the speed regulation knob corresponds to different speed ranges at different positions, the control circuit board 35 records the data, and when the speed is abnormal, the control circuit board 35 finds the speed abnormality through comparison and judgment, wherein the speed abnormality may be due to a jam, a load is increased, and the speed is suddenly reduced.

The driving motor 21 of the present invention is preferably a coreless brushless dc motor, which has small friction, high energy conversion efficiency, rapid start and brake, extremely rapid response, and can easily and sensitively adjust the rotating speed in a high-speed running state. The driving gear 22 has a larger diameter than the transmission gear 23, and the gear ratio of the two is 3. Furthermore, the driving motor 21 is a stepless speed regulating motor to better adapt to the grinding requirement in the operation.

Referring to fig. 2 and 3, the driving assembly 20 further includes a guide rail 24 fixed in the housing 10 and a motor support 25 slidably connected to the guide rail 24, the guide rail 24 extends in a direction parallel to the axial direction of the rigid shaft 321, and the driving motor 21 is mounted on the motor support 25. In order to ensure the installation and sliding stability of the driving motor 21 and further improve the controllability of the flexible shaft 322 entering and exiting the blood vessel, two motor supporting seats 25 are provided, two guide rails 24 are arranged in parallel, each motor supporting seat 25 is respectively in sliding fit with the two guide rails 24, and the driving motor 21 is installed between the two motor supporting seats 25.

The driving assembly 20 further includes an operating handle 26 and a sliding block 27 connected to each other, the sliding block 27 is connected to the driving motor 21, and the two can be directly connected to each other or connected to each other by a connecting member or the like, as shown in fig. 2 and 3, and the sliding block 27 is connected to the driving motor 21 by a motor support 25. The casing 10 is provided with a sliding groove 11 parallel to the guide rail 24, the sliding block 27 is slidably connected to the sliding groove 11, the operating handle 26 extends out of the casing 10, and an operator can push the driving mechanism 20 to slide by pushing the operating handle 26, so that the operation of the operator is facilitated. Further, the operating handle 26 is connected with the sliding block 27 by a screw thread, the projection of the operating handle 26 is at least partially positioned outside the sliding chute 11 in the axial direction of the operating handle 26 (the axial direction of the screw thread), the operating handle 26 and the sliding block 27 are slightly loosened when the driving mechanism 20 is slid, the operating handle 26 and the sliding block 27 are locked when the driving mechanism 20 is slid to a required position, and the driving mechanism 20 is fixed relative to the shell 10, so that the driving mechanism 20 can be prevented from unnecessarily sliding in the operation to influence the normal operation of the operation.

Specifically, the rotational grinding layer 323 is a cylindrical structure, and the thickness of the rotational grinding layer 323 is uniform in comparison with other structures such as an ellipsoid structure, and the rotational grinding layer 323 can be thinner, so that the whole rotational grinding head is lighter in weight, smaller in grinding force and higher in safety. In order to better reduce the size of the whole rotational grinding head, and be more beneficial to the rotation and the promotion of the revolution of the rotational grinding head in the blood vessel, preferably, the outer diameter of the rotational grinding layer 323 is 0.7-0.9 mm, such as 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm and the like, the thickness of the rotational grinding layer 323 is 120-200 um, such as 120um, 130um, 135um, 140um, 175um, 185m, 170um, 195um, 200um and the like, the outer diameter of the rotational grinding layer 323 is smaller and the thickness is moderate, so that the rotational grinding head can be applied to the blood vessel with a wider diameter range, and can ensure the connection reliability between the rotational grinding layer 323 and the flexible shaft 322, thereby improving the safety of the operation.

Each of the spin-milled layers 323 has a length of 1.2-4mm, such as 1.2mm, 1.5mm, 1.8mm, 2.0mm, 2.3mm, 2.5mm, 2.8mm, 3.0mm, 3.2mm, 3.5mm, 3.9mm, 4.0mm, and the like. By adopting the rotary grinding layers 323 with the size, the length of each rotary grinding layer 323 is proper, when plaque is ground, the flexible shaft 322 is easier to move flexibly when moving forwards or backwards, the grinding efficiency is improved, and the effect is more obvious when the flexible shaft moves in blood vessels with special structures. Further, the distance (the size along the axial direction of the flexible shaft 323) between two adjacent rotational grinding layers 323 is 2-5 mm, that is, the length of the gap between two adjacent rotational grinding layers 323 is 2-5 mm, such as 2mm, 3mm, 4mm, 5mm, etc., after the arrangement, the length of the whole rotational grinding area can meet the grinding requirement of a plaque, and the rotational grinding area is matched with the preferable outer diameter, length, etc. of the rotational grinding layers 323, so that the movement of the rotational grinding head is more flexible, and the ground grinding dust can be discharged into flowing blood more quickly.

The rotational grinding layer 323 can be formed on the flexible shaft 322 by spraying or the like, and preferably, the rotational grinding layer 323 is formed on the surface of the flexible shaft 322 by electroplating, so that the connection between the rotational grinding layer 323 and the flexible shaft 322 is firmer, and the safety of the operation is improved. Specifically, the rotational grinding layer 323 comprises a nickel matrix coated on the outer surface of the flexible shaft 322 and abrasive grains uniformly distributed on the nickel matrix, wherein the abrasive grains are diamond abrasive grains or CBN abrasive grains; the grain diameter of the abrasive particles is 10-50 um, such as 10um, 20um, 30um, 33um, 35um, 40m, 45um, 50um and the like, and the height of the abrasive particles protruding out of the surface of the nickel substrate is 10-20 um, such as 10um, 12um, 15um, 16m, 18um, 19um, 20um and the like; and the density of the abrasive particles is 500-2000 particles/mm, such as 500 particles/mm, 550 particles/mm, 600 particles/mm, 800 particles/mm, 1000 particles/mm, 1500 particles/mm, 1800 particles/mm, 2000 particles/mm, etc. After the arrangement, the combination of the rotary grinding layer 323 and the flexible shaft 322 is firmer, the grinding force is moderate, the grinding effect is good, the blood vessel is not damaged, and the generated abrasive dust is basically below 30um and is easy to be taken away by blood and absorbed by human body.

Further, each of the rotational grinding layers 323 is provided with a spiral groove on an outer surface thereof, so that grinding dust generated by rotational grinding can enter a gap between two adjacent rotational grinding layers 323 along with the spiral groove, and can be discharged as soon as possible.

The guide wire 31 and the shaft assembly 32 sliding relative to the guide wire 31, the guide wire 31 serves as a track for the whole shaft assembly 32 to slide, and the guide wire guides the sliding of the shaft assembly 32.

Wherein the stiffness of the guidewire 31 is less than the stiffness of the flexible shaft 322 to enable the guidewire 31 to better conform to the extended path of the blood vessel. Preferably, the guide wire has a diameter of 0.15 to 0.25mm, such as 0.15mm, 0.06mm, 0.18mm, 0.20mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, and the like.

In order to reduce the damage to the blood vessel, the high-speed rotational atherectomy device of the present invention can achieve a high rotational speed of 17 to 25 million revolutions per minute of the shaft assembly 32, but this high rotational speed is generally used only in the rotational atherectomy mode, and the rotational speed is set relatively low in the non-rotational atherectomy mode. Of course, rather than using a rotational speed of 17 to 25 ten thousand revolutions per minute in the rotational grinding state, a lower rotational speed, such as 7000 revolutions per minute, may be used.

Wherein, the spiral surrounding direction of the outer layer spring wire and the rotation direction of the driving shaft of the driving motor 21 can be the same or opposite, in a preferred embodiment, the spiral surrounding direction of the outer layer spring wire and the rotation direction of the driving shaft of the driving motor 21 in the grinding state are the same, so that the flexible shaft 322 can be in the winding state better in the grinding state, the torque can be transmitted better, and the grinding speed can be further improved.

Specifically, the outer layer spring wire and the inner layer spring wire may be spring wires with circular cross sections, or spring wires with other cross-sectional shapes.

It is understood that if the flexible shaft 322 is too rigid, it is beneficial to transmit torque, but when the flexible shaft 322 rotates, the rotational abrasion layer 323 may only abrade a certain position or a small area in the circumference of the blood vessel in a short time, and the revolving speed is slow, which is not beneficial to the rotational abrasion layer 323 revolving in the blood vessel. In order to solve the problem, and considering that the inner diameter of a human blood vessel is basically 4-6 mm, if the flexible shaft 322 is too thin, the inner layer spring wire and the outer layer spring wire which form the flexible shaft are too thin, the rigidity of the whole flexible shaft 322 is insufficient, and the transmission of torque is influenced; if the flexible shaft 322 is too thick, it will occupy a large space in the radial direction of the blood vessel, and the blood flow velocity will be slower in the case of an originally occluded blood vessel, for which reason, in a preferred embodiment of the present invention, the outer diameter of the flexible shaft 322 is 0.6 to 0.8mm, such as 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, and the diameter of the outer layer spring wire is greater than or equal to the diameter of the inner layer spring wire, specifically, the diameter of the outer layer spring wire is preferably 0.1 to 0.15mm, such as 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, etc.; the diameters of the inner layer spring wires are 0.05-0.1mm, 0.05mm, 0.06mm, 0.08mm, 0.09mm, 1mm and the like, the outer layer spring wires and the inner layer spring wires in the range are selected to be wound to form the flexible shaft 322 in the range, the rigidity of torque transmission can be better met, the rigidity is not too strong, and the flexible shaft 322 only occupies less than one fourth of the radial dimension of the vessel space, so that enough movement space is provided for the rotational grinding head, and therefore the rotational grinding head can be better ensured to form revolution movement along the circumferential direction of the vessel in the process of rotating around the axis of the flexible shaft 322, and further form circumferential grinding; and this arrangement minimizes the effect of the flexible shaft 322 on blood flow.

The outer layer spring wire and the inner layer spring wire are made of 304 stainless steel or 304v stainless steel, and the stainless steel material of the material has the characteristics of high strength and good toughness, can better realize torque transmission and is more favorable for the formation of revolution.

The number of the outer layer spring wire and the number of the inner layer spring wire may be 1 to 6, the number of the outer layer spring wire and the number of the inner layer spring wire may be equal or unequal, and preferably, the number of the outer layer spring wire and the number of the inner layer spring wire are selected to be 3, 4 or 6, so that dense winding between each layer of the outer layer coil group 3222 and the inner layer coil group 3221 and close attachment between the two layers are better achieved.

When the flexible shaft rotates at a high speed, friction may occur between the flexible shaft 322 and the guide wire 31 inserted therein, and in order to reduce wear of the flexible shaft and the guide wire 31, the inner surface of the flexible shaft 322 and the outer surface of the guide wire 31 are respectively provided with an anti-friction coating, which may be formed on the inner surface of the flexible shaft 322 and the outer surface of the guide wire 31 by surface treatment or spraying. The friction reducing coating may be a polytetrafluoroethylene coating.

It should be noted that, although some preferred structural parameters of the flexible shaft 322 and the rotational grinding layer 323 are given in the above embodiments, the present invention is not limited to the above specific numerical range.

Further, in order to increase the convenience of the operator, the interventional type rotational grinding device further comprises a display screen 60, the thermocouple wire 342 is connected with the display screen 60, and particularly can be connected with the display screen 60 through the control circuit board 35, so that the temperature sensed by the temperature detection component is displayed on the display screen 60, and the operator can know the temperature detected by the temperature detection component more intuitively. Accordingly, the housing 10 is provided with the display window 16, and the display screen 60 is fixed to the housing 10 and exposes the display window 16.

The housing 10 includes a bottom case 12 and a housing cover 13 detachably connected to each other, and the bottom case 12 and the housing cover 13 may be connected by screws, or by clamping. The guide rail 24 is fixedly connected to the bottom housing 12, and may also be integrally formed with the bottom housing 12, i.e., the two may be a single component. In the embodiment in which the output connector 35 includes the first flange 353 having a square structure, the housing 10 is provided therein with the engaging groove 14, the side wall of the engaging groove 14 is provided with a through hole, the first flange 353 is engaged with the engaging groove 14, and the tube body 352 and the first supporting tube 333 are inserted into the through hole. The clamping groove 14 can be formed by two connecting plates 15, the clamping groove 14 and a through hole can be formed only by arranging the connecting plates 15 on the bottom shell 12, the two connecting plates 15 can be arranged on the bottom shell 12 and the shell cover 13, the clamping groove 14 is formed in the space between the two connecting plates 15, and the through hole is formed at the position where the pipe body 352, the first supporting pipe 333 and other pipelines such as the cooling pipeline 40 need to pass through.

In order to further improve the safety of the intervention type rotational grinding device, an emergency stop switch 17 may be further mounted on the housing 10, the emergency stop switch 17 is connected to the control circuit board, and when the intervention type rotational grinding device is in an abnormal working state, the control circuit board controls the driving motor 21 to stop working by starting the emergency stop switch 17.

Since the patches are not regular and the formed cavities are not regular cylindrical cavities, the diameters of the cavities are merely for convenience of description, and the cavities are not limited to cylindrical cavities.

When the interventional type rotational atherectomy device is used, the guide wire 31 firstly enters a blood vessel to guide the sheath tube 331 and the flexible shaft 322, then the sheath tube 331 and the flexible shaft 322 enter the blood vessel together, the rotational atherectomy area is always retracted into the sheath tube 331 before the end part of the sheath tube 331 reaches a plaque, when the sheath tube 331 reaches the plaque, the driving motor 21 is started, the rotational atherectomy area is pushed to extend out of the sheath tube 331 by the sliding of the driving mechanism 20, the rotating speed of the driving motor 21 is increased when the rotational atherectomy layer 323 contacts the plaque, and the atherectomy device performs grinding.

It will be appreciated by those skilled in the art that the above-described preferred embodiments may be freely combined, superimposed, without conflict.

It will be understood that the embodiments described above are illustrative only and not restrictive, and that various obvious and equivalent modifications and substitutions for details described herein may be made by those skilled in the art without departing from the basic principles of the invention.

Claims

1. A high-speed rotary grinding mechanism is used for an intervention type rotary grinding device, the intervention type rotary grinding device comprises a shell, a cooling pipeline and a driving mechanism, the driving mechanism comprises a driving motor, a driving gear connected with the driving motor and a transmission gear meshed with the driving gear, and the driving motor is slidably mounted in the shell along a direction parallel to a driving shaft of the driving motor; it is characterized in that the preparation method is characterized in that,

the guide wire penetrates through the shaft assembly; the shaft assembly comprises a rigid shaft connected with the transmission gear in an inserted mode and a flexible shaft connected with the rigid shaft and partially extending out of the shell, the flexible shaft comprises an inner coil group and an outer coil group which are arranged in an attached mode, the inner coil group comprises a plurality of inner spring wires which are spirally wound and attached to each other, the outer coil group comprises a plurality of outer spring wires which are spirally wound on the outer surface of the inner coil group and attached to each other, the spiral winding directions of the outer spring wires and the inner spring wires are opposite, the outer spring wires are welded to each other at two ends of the flexible shaft, the inner spring wires are welded to each other, and the inner coil group and the outer coil group are welded to each other; the part, far away from the rigid shaft, of the flexible shaft forms a rotational grinding area, two or three rotational grinding layers circumferentially surrounding the flexible shaft are arranged on the outer surface of the outer layer coil group at intervals in the rotational grinding area so as to grind the same plaque, one rotational grinding layer on the outermost side is located at the end part of the flexible shaft, a gap is formed between two adjacent rotational grinding layers and the flexible shaft located between the two rotational grinding layers, a spiral groove is formed in the outer surface of each rotational grinding layer, and the spiral groove is communicated with the gap; the flexible shaft is inserted into the output joint and the sheath pipe in a sliding mode, and the rotary grinding layer can extend out of one end, far away from the shell, of the sheath pipe.

2. The high-speed rotational atherectomy mechanism of claim 1, wherein the temperature sensing assembly is a T-thermocouple.

3. The high-speed rotational atherectomy mechanism of claim 1, wherein the output fitting comprises a tube body, a first flange and a second flange connected to two ends of the tube body, the first flange having a square configuration and adapted to be snapped into the housing; the second flange is positioned on the outer side of the shell, and a cooling medium output port of the output joint is arranged on one side, away from the pipe body, of the second flange; the cooling medium input port is arranged on the pipe body.

4. The high-speed rotational atherectomy mechanism of claim 1, wherein the track tube assembly further comprises a motor support tube, a first stationary support tube and a second stationary support tube within the housing, the motor support tube being secured to the drive mechanism; one end of the first fixing supporting tube is fixedly connected with one end of the output joint far away from the sheath tube, and the other end of the first fixing supporting tube is in sliding fit with the motor supporting tube; one end of the second fixing support pipe is inserted into one end, far away from the rotary grinding layer, of the shaft assembly in a sliding mode, and the other end of the second fixing support pipe is fixed at the rear end of the shell.

5. The high-speed rotational atherectomy mechanism of claim 1, wherein the temperature sensing assembly further comprises an indicator light, and the indicator light is connected to the thermocouple wire to control the indicator light to display different colors according to the temperature sensed by the temperature sensing assembly.

6. The high-speed rotational grinding mechanism according to any one of claims 1 to 5, wherein the rotational grinding layer is in a cylindrical barrel structure, and the outer diameter of the rotational grinding layer is 0.7 to 0.9mm; the thickness of the material is 120 to 200um; the length of each rotary grinding layer is 1.2-4mm, and the distance between two adjacent rotary grinding layers is 2-5 mm.

7. The high-speed rotational grinding mechanism according to any one of claims 1 to 5, wherein the rotational grinding layer comprises a nickel matrix covering the outer surface of the flexible shaft and abrasive grains uniformly distributed on the nickel matrix, and the abrasive grains are diamond abrasive grains or CBN abrasive grains; the particle size of the abrasive particles is 10 to 50um, the density is 500 to 2000 particles/square millimeter, and the height of the abrasive particles protruding out of the nickel matrix is 10 to 20um.

8. The high-speed rotational grinding mechanism according to any one of claims 1 to 5, wherein the outer diameter of the flexible shaft is 0.6 to 0.8mm; the diameter of the outer layer spring wire is 0.1 to 0.15mm; the diameter of the inner layer spring wire is 0.05 to 0.1mm.

9. An interventional rotational grinding device, which is characterized by comprising a shell, a cooling pipeline arranged in the shell, a driving mechanism and the high-speed rotational grinding mechanism of any one of claims 1 to 8, wherein the output joint is of a hollow structure, and a cooling medium inlet connected with the cooling pipeline is formed in the side wall of the output joint; the driving mechanism is arranged in the shell in a sliding manner and comprises a driving motor, a driving gear connected with the driving motor and a transmission gear meshed with the driving gear, and the driving motor is arranged in the shell in a sliding manner along the direction parallel to the driving shaft of the driving motor; and one end of the flexible shaft, which is far away from the rotary grinding layer, is connected with the transmission gear.

10. The interventional rotational atherectomy device of claim 9, wherein the housing is provided with a display window; the insertion type rotary grinding device further comprises a display screen which is arranged on the shell and exposed out of the display window, and the thermocouple wire is connected with the display screen so as to display the temperature sensed by the temperature detection assembly on the display screen.