CN217793252U

CN217793252U - Rotary grinding device

Info

Publication number: CN217793252U
Application number: CN202221540873.8U
Authority: CN
Inventors: 季晓飞; 常兆华; 岳斌; 姚映忠; 刘沛丰
Original assignee: Shanghai Minimally Invasive Medical Technology Co ltd
Current assignee: Shanghai Minimally Invasive Medical Technology Co ltd
Priority date: 2022-06-20
Filing date: 2022-06-20
Publication date: 2022-11-15
Anticipated expiration: 2032-06-20

Abstract

The utility model relates to a rotary grinding device, including rotary grinding subassembly, drive shaft, liquid pipe and pump liquid spare, the distal end of drive shaft is connected with the rotary grinding subassembly to drive the rotary grinding subassembly and rotate, lead to the liquid pipe box and locate the drive shaft, and lead to the liquid pipe and have logical sap cavity, pump liquid spare is connected with drive shaft drive, and can carry liquid through the distal end of sap cavity court liquid pipe under the drive of drive shaft. The utility model discloses a rotary grinding device, pump liquid spare is connected with drive shaft transmission, and can carry liquid through the distal end of sap cavity towards liquid pipe under the drive of drive shaft, when the drive shaft rotates, pump liquid spare can rotate along with the drive shaft, thereby increase along with the rotational speed of drive shaft, pump liquid spare increases the saline flow that distal end transmission was filled, can increase the saline flow, grind the abrasive dust particle that the in-process produced with the rotary grinding subassembly of scouring, and reduce the rotatory temperature rise that leads to of rotary grinding subassembly and vascular tissue and the blood that arouses and cause the thermal injury, avoid complication such as slow blood flow/no reflow.

Description

Rotary grinding device

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to a grind device soon.

Background

Atherosclerotic plaques are typically located in the vasculature of coronary or peripheral arteries, and may have different characteristics depending on the texture of the plaque. The principle of the method is that a rotary grinding device is used for high-speed rotary grinding at a vascular lesion, calcified or fibrotic arteriosclerosis plaques are removed, blood vessels blocked by the plaques are opened, an enlarged smooth inner cavity of the blood vessel is obtained, and subsequent stent implantation is facilitated.

When the rotary grinding device carries out rotary grinding operation, the rotary grinding catheter drives the rotary grinding head to rotate at high speed mainly through the driving shaft, and the rotary grinding head is pushed forward to contact and grind to remove pathological changes. To reduce thermal damage to vascular tissue and blood due to heat generated during the abrading process, infusion of a cooling fluid (e.g., saline) is required to cool and flush the resulting abrasive dust particles during the rotational abrading process.

However, the rotational grinding device of the related art mainly uses a pressurizing bag or an infusion pump to deliver the cooling fluid in a fluid storage bag to the distal end of the catheter, so as to cool and flush the generated abrasive dust particles, but cannot timely and effectively adjust the filling flow of the cooling fluid according to the actual rotational grinding condition.

SUMMERY OF THE UTILITY MODEL

Based on this, provide a rotary grinding device to solve the problem that can't adjust the filling flow of coolant liquid effectively in time.

The utility model provides a grind device soon, include:

a rotational grinding assembly;

the distal end of the driving shaft is connected with the rotary grinding assembly and is used for driving the rotary grinding assembly to rotate;

the liquid passing pipe is sleeved on the driving shaft and is provided with a liquid passing cavity;

and the liquid pumping piece is in transmission connection with the driving shaft and can convey liquid towards the far end of the liquid through pipe through the liquid through cavity under the driving of the driving shaft.

In one embodiment, the driving shaft penetrates through the liquid through cavity, and the liquid pumping piece is coaxially arranged on the driving shaft.

In one embodiment, the pumping element has at least one axial groove, which provides that the circumferential side of the pumping element forms at least one blade for conveying liquid along the liquid passage chamber towards the distal end of the liquid passage tube when the pumping element is rotated.

In one embodiment, the outer diameter of the bucket increases in size from the proximal end to the distal end.

In one embodiment, the liquid passing tube comprises a guide cavity separated from the liquid passing cavity, and the driving shaft is arranged in the guide cavity in a penetrating mode and is in transmission connection with the pump liquid piece through a transmission mechanism.

In one embodiment, the transmission mechanism includes a gear transmission assembly, the gear transmission assembly includes a driving wheel and a driven wheel engaged with each other, the driving wheel is connected with the driving shaft, and the driven wheel is connected with the pumping fluid element.

In one embodiment, the gear assembly includes at least one intermediate gear that is disposed in meshing engagement between the drive wheel and the driven wheel.

In one embodiment, the transmission mechanism includes a worm gear and a worm screw which are engaged with each other, the worm screw is coaxially connected with the driving shaft, the pumping unit includes a plurality of impellers, and the plurality of impellers are connected with the worm gear, so that when the worm screw drives the worm gear to rotate, the worm gear drives the plurality of impellers to rotate.

In one embodiment, the rotational axis of the pumping element is parallel to and spaced from the drive shaft.

In one embodiment, the liquid inlet pipe is communicated with the liquid through cavity.

In one embodiment, a drive assembly is included and is coupled to the proximal end of the drive shaft and is configured to rotate the drive shaft.

In one embodiment, the guide wire is arranged on the driving shaft in a penetrating mode, the driving shaft and the rotary grinding assembly are capable of moving axially along the guide wire and moving in a rotating mode around the guide wire.

The rotary grinding device comprises a rotary grinding assembly, a driving shaft, a liquid through pipe and a pump liquid piece, wherein the far end of the driving shaft is connected with the rotary grinding assembly and used for driving the rotary grinding assembly to rotate, the liquid through pipe is sleeved on the driving shaft and provided with a liquid through cavity, the pump liquid piece is in transmission connection with the driving shaft and can convey liquid towards the far end of the liquid through pipe through the liquid through cavity under the driving of the driving shaft, so that the rotation speed of the driving shaft is increased, the amount of saline water for remote transmission and perfusion is increased by the pump liquid piece, the flow of the saline water can be increased, the abrasive dust particles generated in the rotary grinding process of the rotary grinding assembly are washed away, the temperature rise caused by rotation of the rotary grinding assembly and the thermal injury caused by blood vessel tissues and blood are reduced, and complications such as slow blood flow/no backflow are avoided. When the drive shaft rotates under drive assembly's drive, the pump liquid spare can rotate along with the drive shaft to along with the rotational speed increase of drive shaft, the distal end transmission saline volume of filling is increased to the pump liquid spare, can increase the brine flow, with the abrasive dust particle that washes the rotational grinding in-process of rotational grinding subassembly and produce, and reduce the rotatory temperature rise that leads to of rotational grinding subassembly and the vascular tissue and the blood that arouse and cause the thermal damage, avoid complication such as slow blood flow/no refluence.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following descriptions are only some embodiments of the present invention, and for those skilled in the art, drawings of other embodiments can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of a structure of a rotational polishing apparatus according to embodiment 1;

FIG. 2 is a schematic cross-sectional view of the rotational grinding apparatus according to embodiment 1 at a liquid pumping part;

FIG. 3 is a schematic diagram showing the structure of one embodiment of a pumping element of the rotational atherectomy device of example 1;

FIG. 4 is a schematic view of the structure of the rotational polishing apparatus according to embodiment 2;

fig. 5 is a schematic cross-sectional structure of the rotational grinding apparatus of embodiment 2 at a liquid pumping part.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms different from those described herein and similar modifications may be made by those skilled in the art without departing from the spirit and scope of the invention and, therefore, the invention is not to be limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are for illustrative purposes only and do not denote a single embodiment.

It will be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing and simplifying the invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the invention.

In an embodiment of the present invention, the proximal end is the end of the medical device close to the operator (e.g. doctor), and the distal end is the end of the medical device away from the operator.

Example 1

Referring to fig. 1, the rotational atherectomy device 10 comprises a rotational atherectomy device 11, a drive shaft 12, a guidewire 13, a catheter 14, a pumping element 15, a fluid inlet line 16, and a drive assembly 17.

The distal end at drive shaft 12 is connected to the rotational atherectomy subassembly 11, and the seal wire 13 is worn to locate rotational atherectomy subassembly 11 and drive shaft 12, and drive shaft 12 and rotational atherectomy subassembly 11 can be followed the axial displacement on seal wire 13, and drive shaft 12 and rotational atherectomy subassembly 11 can be around seal wire 13 rotary motion. In some embodiments, the rotational atherectomy procedure may be performed by operating the drive shaft 12 and the rotational atherectomy assembly 11 to move back and forth along the guide wire 13, wherein axial movement refers to distal and proximal movement along the guide wire 13 to effect rotational atherectomy of a lumen (e.g., a blood vessel) at a location where rotational atherectomy is desired to unclog the lumen.

In some embodiments, the atherectomy assembly 11 comprises a abrasive tip, wherein at least a portion of the surface of the abrasive tip is covered with abrasive particles, including but not limited to diamond particles, such that the abrasive tip provides good atherectomy performance during rotation with the drive shaft 12.

It should be noted that the guide wire 13 is not essential to the rotational grinding of the rotational grinding assembly 11, and may be omitted.

The inlet line 16 is used to input a cooling fluid, including but not limited to brine.

For convenience of description, the cooling liquid is brine as an example.

The liquid inlet pipeline 16 is communicated with the liquid through pipe 14, and the saline is conveyed to the far end through the liquid through cavity 141 of the liquid through pipe 14 to flow out, so as to wash the particles generated by the rotational grinding and take away the heat generated by the rotational grinding, thereby reducing the temperature rise caused by the rotation of the rotational grinding component 11 and the thermal damage caused by the blood vessel tissue and blood, and avoiding the complications of slow blood flow/no re-flow, etc.

The pump fluid part 15 is an element capable of pumping liquid, specifically, the pump fluid part 15 is in transmission connection with the driving shaft 12, and the pump fluid part 15 can be driven by the driving shaft 12 to rotate so as to pump liquid.

Specifically, the driving assembly 17 is connected to the driving shaft 12, and the driving shaft 12 drives the liquid pumping member 15 and the rotational grinding assembly 11 to rotate under the driving of the driving assembly 17. In this embodiment, the pumping element 15 is coaxially disposed on the driving shaft 12, such that when the driving shaft 12 is rotated by the driving assembly 17, the pumping element 15 rotates with the driving shaft 12. Understandably, the flow rate of the saline water is controlled by controlling the rotation speed of the pump fluid element 15, and the power sources of the pump fluid element 15 and the driving shaft 12 are both the driving assembly 17, so that the rotary milling device 10 can change the amount of the saline water conveyed to the far end of the rotary milling device 10 along with the change of the rotation speed of the driving shaft 12. Specifically, since the pumping element 15 is coaxially disposed on the driving shaft 12, the pumping element 15 increases the amount of saline delivered at the distal end as the rotation speed of the driving shaft 12 increases, so as to increase the flow rate of saline, wash away the particles of the abrasion debris generated during the rotational abrasion of the rotational abrasion assembly 11, reduce the temperature rise caused by the rotation of the rotational abrasion assembly 11 and the thermal damage to the vascular tissue and blood caused thereby, and avoid the complications of slow blood flow/no-reflow.

It should be noted that, as shown in fig. 2, the liquid pumping element 15 is coaxially disposed on the driving shaft 12 and rotatably disposed in the liquid flowing tube 14, so that a liquid flowing cavity 141 is formed between an outer wall of the driving shaft 12 and an inner wall of the liquid flowing tube 14, so that when the driving shaft 12 drives the liquid pumping element 15 to rotate, the liquid flowing cavity 141 can deliver saline to the distal end of the rotational abrasion device 10 to flush the abrasion debris generated by the rotational abrasion, and at the same time, can take away heat generated during the rotation of the driving shaft 12 to cool the driving shaft 12, so as to reduce temperature rise caused by the rotation of the rotational abrasion assembly 11 and thermal damage to blood vessels and tissues caused by the rotation of the rotational abrasion assembly 11, and avoid complications such as slow blood flow/no backflow.

In the embodiment of the rotational atherectomy device 10 in which the guide wire 13 is inserted through the drive shaft 12, the rotational axis of the pump fluid 15 coincides with the guide wire 13 during rotation of the pump fluid 15 with the drive shaft 12, in other words, the pump fluid 15 rotates around the guide wire 13. The rotation axis of the pumping fluid member 15 is an axis about which the pumping fluid member 15 rotates.

It should be noted that the liquid flowing pipe 14 may be a single pipe, or may be formed by combining multiple sections of pipes. For example, referring to fig. 1, the portion of the liquid passing pipe 14 corresponding to the liquid pumping member 15 may be formed to have a larger diameter than the other portion to facilitate the installation of the liquid pumping member 15.

As shown in fig. 2 and 3, pumping element 15 has at least one axial groove 151, and axial groove 151 forms at least one blade 152 on a circumferential side of pumping element 15. During rotation of the pumping element 15, the blades 152 push the saline along the lumen 141 towards the distal end of the catheter 14, eventually causing the saline to exit the distal end of the catheter 14. In this embodiment, the distal end of the liquid passing tube 14 is located at the position of the rotational grinding, and specifically, the grinding dust generated during the rotational grinding of the rotational grinding assembly 11 can be washed by the saline output from the liquid passing tube 14.

Further, the outer diameter of the bucket 152 gradually increases in size from the proximal end to the distal end. In this embodiment, the saline water can flow through the surface of the movable vane 152 through the liquid through cavity 141, and the larger the diameter of the distal end of the movable vane 152 of the pumping liquid member 15 is, the higher the rotational linear velocity is, and the higher the flow velocity of the driving liquid is. According to the Bernoulli principle, the liquid pressure is low at the position where the flow velocity of the far end of the liquid pumping element 15 is high, the liquid pressure is high at the position where the flow velocity of the near end of the liquid pumping element 15 is low, and the liquid accelerates to flow from the near end to the far end under the action of pressure difference. Therefore, by using the liquid pumping member 15, the saline transportation performance can be improved, and the saline transportation along the liquid through pipe 14 can be facilitated to the remote rotational grinding position.

It should be noted that, with this configuration of the pumping element 15, the brine always flows distally along the liquid conduit 14 regardless of whether the pumping element 15 rotates in the forward direction or in the reverse direction, so that the flow rate of the brine increases with the increase of the rotation speed of the turbine during the rotational grinding process, and is not affected by the rotation direction of the pumping element 15.

As shown in fig. 3, pumping element 15 has 8 blades 152. In some embodiments, pumping element 15 has more blades 152, for example, 9 or 10. The number of the blades 152 of the pumping fluid 15 is not limited herein.

The rotational speeds of the driving shaft 12, the rotational grinding assembly 11 and the liquid pumping element 15 of the rotational grinding apparatus 10 are the same, the rotational speed is obtained by the driving assembly 17, and the driving assembly 17 of this embodiment may be an electric motor or a pneumatic motor as long as the driving shaft 12 can be driven to rotate.

In some embodiments, the rotational speed range at which the rotational abrasion assembly 11 is driven by the driving assembly 17 is 1000rad/min to 200000rad/min, such as 1000rad/min, 2000rad/min, 5000rad/min, 10000rad/min, 15000rad/min, 150000rad/min, 170000rad/min or 200000rad/min. When the pump fluid 15 rotates, the saline flow delivered from the fluid lumen 141 of the fluid conduit 14 to the distal end of the rotational atherectomy device 10 ranges from 0.1ml/min to 100ml/min. Preferably, when the driving assembly 17 drives the rotational grinding assembly 11 to rotate, the rotational speed of the rotational grinding assembly 11 is 200000rad/min, and the flow rate of the saline generated by the rotation of the liquid pumping element 15 is 50ml/min, so that the rotational grinding effect of the rotational grinding assembly 11 is ensured, and simultaneously, the saline is effectively used for washing the abrasive dusts generated by the rotational grinding.

Example 2

As shown in fig. 4, the rotational polishing apparatus 20 provided in embodiment 2 is similar to the rotational polishing apparatus 10 provided in embodiment 1, and the rotational polishing apparatus 20 includes a rotational polishing assembly 21, a driving shaft 22, a guide wire 23, a liquid passing tube 24, a liquid pumping member 25, a liquid inlet pipe 26 and a driving assembly 27.

The guide wire 23 is not necessary, and in the embodiment where the rotational atherectomy device 20 includes the guide wire 23, as shown in fig. 4 and 5, the guide wire 23 is threaded through the rotational atherectomy assembly 21 and the drive shaft 22, the drive shaft 22 and the rotational atherectomy assembly 21 are capable of moving axially along the guide wire 23, and the drive shaft 22 and the rotational atherectomy assembly 21 are capable of moving rotationally about the guide wire 23.

Compared with the embodiment 1, in the rotational grinding device 20 of the embodiment 2, the pump liquid part 25 is not coaxial with the driving shaft 22, specifically, the rotational grinding device 20 includes a transmission mechanism, the pump liquid part 25 is in transmission connection with the driving shaft 22 through the transmission mechanism, and with this structure, when the driving shaft 22 rotates, the driving shaft 22 can drive the pump liquid part 25 to rotate through the transmission mechanism, so that when the rotational grinding head at the far end of the driving shaft 22 performs the rotational grinding operation, the pump liquid part 25 can convey the saline water to the rotational grinding position towards the far end through the liquid conduit 24.

Because the transmission mechanism is in transmission connection with the liquid pumping element 25 and the driving shaft 22, when the driving shaft 22 is accelerated, the liquid pumping element 25 is accelerated together to increase the saline flow for flushing abrasive particles, reduce the temperature rise caused by the high-speed rotation of the rotary grinding head and the thermal injury caused by vascular tissues and blood, and avoid the complications of slow blood flow/no-reflow and the like.

In some embodiments, the transmission mechanism includes, but is not limited to, a gear assembly, for example, a gear assembly including a drive pulley 28 and a driven pulley 29 that intermesh, the drive pulley 28 being coupled to the drive shaft 22, and the driven pulley 29 being coupled to the pumping element 25. Preferably, the driven wheel 29 is connected to the pumping fluid member 25 through a transmission shaft, and when the driving shaft 22 rotates, the driving wheel 28 engages the transmission driven wheel 29 to rotate, so that the driven wheel 29 drives the pumping fluid member 25 to rotate through the transmission shaft.

Further, the transmission ratio between the driving wheel 28 and the driven wheel 29 is larger than 1, so that when the driving shaft 22 rotates, the driven wheel 29 can transmit as large a torque as possible to the pump fluid 25 via the driving shaft, so that the pump fluid 25 has a sufficiently large thrust to deliver saline to the rotational grinding position via the fluid pipe 24. The transmission ratio between the driving wheel 28 and the driven wheel 29 may be specifically 1.1:1 to 3:1.

in some embodiments, the transmission ratio between the driving wheel 28 and the driven wheel 29 may be less than or equal to 1, wherein when the transmission ratio between the driving wheel 28 and the driven wheel 29 is equal to 1, the pump fluid element 25 always keeps the same rotation speed as the driving shaft 22 during the rotation of the driving shaft 22. When the transmission ratio between the driving wheel 28 and the driven wheel 29 is less than 1, the pumping element 25 can inject saline into the liquid through pipe 24 at a speed greater than that of the driving shaft 22 during the rotation of the driving shaft 22, thereby effectively increasing the saline flow rate for flushing the abrasive dust particles.

It should be noted that the gear transmission assembly is not limited to the structure in which the driving wheel 28 and the driven wheel 29 are engaged, and in some embodiments, the gear transmission assembly further includes at least one intermediate gear, and the intermediate gear is engaged between the driving wheel 28 and the driven wheel 29, so that the driving wheel 28 and the driven wheel 29 have a proper transmission ratio.

In some embodiments, the transmission mechanism may be a worm gear-worm transmission structure, and specifically, the transmission mechanism includes a worm gear and a worm that are engaged with each other, wherein the worm is coaxially connected to the driving shaft 22, so that when the driving shaft 22 rotates, the worm rotates the worm gear. In this embodiment, the drive of the worm gear by the worm of the transmission mechanism can be used to transmit the torque of the drive shaft 22 to the pump fluid 25, so as to realize the transmission connection between the drive shaft 22 and the pump fluid 25. Specifically, the pump fluid element 25 includes a plurality of blades 251, and the plurality of blades 251 are connected to the turbine, so that when the worm drives the turbine to rotate, the blades 251 on the turbine also rotate together, thereby delivering the saline water to the rotational grinding position through the fluid conduit 24, for example, to flush the grinding dust generated in the rotational grinding process.

It should be noted that, in the embodiment that adopts the transmission mechanism to make the pump liquid member 25 rotate along with the driving shaft 22, the rotation axis of the pump liquid member 25 is not coincident with the driving shaft 22, for example, the two are parallel and spaced from each other. Accordingly, the fluid passage 241 for the pumping element 25 is not coincident with the drive shaft 22. Specifically, an independent liquid passing cavity 241 is formed by the liquid passing tube 24 sleeved outside the driving shaft 22, specifically, the liquid passing tube 24 includes at least 2 tube cavities spaced apart from each other, taking the example that the liquid passing tube 24 includes 2 tube cavities as shown in fig. 5, one of the 2 tube cavities serves as the liquid passing cavity 241 for conveying saline, and the other one serves as the guiding cavity 242 of the driving shaft 22, and the driving shaft 22 has good stability when moving in the axial direction under the guidance of the guiding cavity 242.

As shown in fig. 5, the pumping element 25 includes a plurality of inclined vanes 251, specifically, the vanes 251 are inclined rather than perpendicular to the axial direction of the pumping element 25, and are similar to fan blades. The vanes 251 are capable of increasing the flow rate of liquid in the liquid passing chamber 241 when rotated. In this embodiment, the flow direction of the brine driven by the pump fluid 25 is related to the rotation direction of the pump fluid 25, and thus, the adjustment of the flow direction of the brine can be achieved by controlling the rotation direction of the drive shaft 22.

The number of the vanes 251 of the liquid pumping member 25 may be specifically 4, 2 or 3, and the number of the vanes 251 is not limited herein.

In some embodiments, the rotation speed of the driving shaft 22 is 200000rad/min, and when the driving shaft 22 drives the pumping fluid 25 to rotate through the transmission mechanism, the rotation speed of the pumping fluid 25 is 20000rand/min, and the flow rate of saline generated by the rotation of the pumping fluid 25 is 30ml/min. In other embodiments, the rotation speed of the driving shaft 22 and the rotation speed of the pumping element 25 may be different values, for example, when the driving shaft 22 drives the pumping element 25 to rotate through the transmission mechanism, the rotation speed of the driving shaft 22 is 150000rad/min to 250000rad/min, and the rotation speed of the pumping element 25 is 1/10 to 1/2 of the rotation speed of the driving shaft 22. And is not limited thereto.

In embodiment 2, the driving assembly 27 may also be an electric motor or a pneumatic motor, which is not limited herein.

It should be noted that, in the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members.

All possible combinations of the technical features in the above embodiments may not be described for the sake of brevity, but should be considered as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above embodiments only represent several embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A rotational atherectomy device, comprising:

a rotational grinding assembly;

the liquid pumping piece is in transmission connection with the driving shaft and can convey liquid towards the far end of the liquid flowing pipe through the liquid flowing cavity under the driving of the driving shaft.

2. The rotational atherectomy device of claim 1, wherein the drive shaft is disposed through the chamber and the pumping element is coaxially disposed on the drive shaft.

3. The rotational atherectomy device of claim 2, wherein the pumping element has at least one axial groove that forms a circumferential side of the pumping element with at least one blade for conveying liquid along the liquid passage chamber towards the distal end of the liquid passage tube when the pumping element is rotated.

4. The rotational atherectomy device of claim 3, wherein the outer diameter of the blades increases in size from the proximal end to the distal end.

5. The rotational atherectomy device of claim 1, wherein the fluid conduit comprises a guide chamber spaced from the fluid conduit chamber, and the drive shaft is disposed through the guide chamber and is drivingly connected to the pumping element via a drive mechanism.

6. The rotational atherectomy device of claim 5, wherein the drive mechanism comprises a gear drive assembly comprising a drive wheel and a driven wheel in meshing engagement, the drive wheel being connected to the drive shaft and the driven wheel being connected to the pumping element.

7. The rotational atherectomy device of claim 6, wherein the gear drive assembly comprises at least one intermediate gear meshingly disposed between the drive wheel and the driven wheel.

8. The rotational atherectomy device of claim 5, wherein the drive mechanism comprises a worm gear and a worm shaft in meshing engagement, the worm shaft being coaxially connected to the drive shaft, and the pumping element comprises a plurality of impellers coupled to the worm gear such that the worm gear rotates the worm gear to thereby cause the plurality of impellers to rotate.

9. The rotational atherectomy device of claim 5, wherein the axis of rotation of the pumping element is parallel to and spaced from the drive shaft.

10. The rotational atherectomy device of any of claims 1 to 9, comprising a fluid inlet line in communication with the fluid lumen.

11. The rotational atherectomy device of claim 1, comprising a drive assembly coupled to the proximal end of the drive shaft and configured to rotate the drive shaft.

12. The atherectomy device of claim 1, comprising a guide wire disposed through the drive shaft and the atherectomy assembly, the drive shaft and the atherectomy assembly being axially movable along the guide wire and being rotationally movable about the guide wire.