Vascular rotary-cutting dredging device

Abstract

The invention provides a blood vessel rotary cutting dredging device, relates to the technical field of medical equipment, and solves the technical problems that a rotary cutting device is complex in operation and low in cutting efficiency. The device comprises a guide pipe, a rotary cutting head, a shell and a torque shaft, the guide pipe is communicated with a negative pressure device, the torque shaft penetrates through the guide pipe, the torque shaft is fixedly connected with the rotary cutting head, and the torque shaft is used for transmitting rotating power to the rotary cutting head when being in transmission connection with a driving device; a shaft cavity is coaxially formed in the catheter, the rotary cutting head, the torque shaft and the shell, and a guide wire penetrates through the shaft cavity; the rotary cutting head comprises a rotary cutting head body and a cutting edge part, the cutting edge part is fixed to the rotary cutting head body, an opening is formed in the shell, at least part of the cutting edge part protrudes out of the opening and is used for cutting blockages in the blood vessel, and the negative pressure device can suck cut disintegrating slag into the catheter from the opening so that the disintegrating slag can be discharged. The device improves the rotary cutting efficiency of obstructions in blood vessels, improves the operation efficiency and is convenient to use.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a vascular atherectomy and dredging device. Background Art

[0002] Coronary atherosclerosis is the main cause of coronary heart disease. Its pathological feature is the formation of plaques on the inner wall of blood vessels, resulting in blood vessel stenosis or occlusion, and further leading to myocardial ischemia, angina pectoris or even myocardial infarction. Currently, common treatment methods include drug treatment, balloon angioplasty (PTCA) and stent implantation (PCI). However, for blood vessels with severe calcification or complex lesions, traditional methods may have limitations, such as incomplete balloon dilation and poor stent apposition.

[0003] Atherectomy is a technique for mechanically removing plaques in blood vessels, which can effectively treat calcified lesions and complex vascular stenosis. However, existing atherectomy devices have the following problems: low cutting efficiency and difficulty in completely removing plaques; complex operation and high requirements for doctors' skills; and the risk of blood vessel perforation or injury.

[0004] Therefore, there is an urgent need for an efficient, safe and easy-to-operate vascular atherectomy and dredging device. Summary of the Invention

[0005] The purpose of the present invention is to provide a vascular atherectomy and dredging device to solve the technical problems of complex operation and low cutting efficiency of existing atherectomy devices. The preferred technical solutions provided by the present invention can produce many technical effects as described below.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] The vascular atherectomy and dredging device provided by the present invention includes a catheter, a cutting head, a housing and a torque shaft, wherein:

[0008] The catheter is connected to a negative pressure device. The torque shaft passes through the catheter and is fixedly connected to the cutting head. When the torque shaft is in transmission connection with a driving device, it is used to transmit rotational power to the cutting head;

[0009] An axial cavity is coaxially arranged in the catheter, the cutting head, the torque shaft and the housing, and the axial cavity is for a guide wire to pass through;

[0010] The cutting head includes a cutting head body and a blade part. The blade part is fixed on the cutting head body. An opening is provided on the housing, and at least part of the blade part protrudes from the opening for cutting the blockage in the blood vessel. The negative pressure device can suck the cut debris into the catheter through the opening and then discharge it.

[0011] Preferably, a spiral groove is provided on the body of the rotary cutting head, and the spiral groove is arranged along the axis of the rotary cutting head body for guiding debris into the catheter.

[0012] Preferably, the cutting edge portion is a spiral structure, and the number of the openings is more than two, and all the openings are arranged around the axis of the housing.

[0013] Preferably, a guiding cone is provided at the end of the housing, the guiding cone is provided with a tapered cavity penetrating through both ends thereof, the tapered cavity is communicated with the shaft cavity, the outer diameter of the guiding cone gradually decreases in a direction away from the cutting edge portion, and the guiding cone and the housing are arranged coaxially for introducing a blockage into the opening.

[0014] Preferably, spiral ribs are provided on the outer periphery of the torque shaft, the spiral ribs extend spirally along the axis direction of the torque shaft, and spiral grooves are formed between adjacent spiral ribs for conveying debris out of the catheter during rotation.

[0015] Preferably, the catheter includes an outer sleeve and an inner tube, wherein:

[0016] The inner tube is located in the outer sleeve, the torque shaft passes through the inner tube and is in transmission connection with the driving device, the torque shaft rotates relative to the catheter, or the driving device is in driving connection with the inner tube for driving the inner tube and the torque shaft to rotate synchronously.

[0017] Preferably, the inner tube includes a soft side and a hard side which are oppositely arranged, the hardness of the soft side is less than that of the hard side, and when an axial force is applied to the catheter, the catheter can only bend from the hard side towards the soft side.

[0018] Preferably, the inner tube is a cylindrical structure woven by elastic wires, an arc-shaped sheet structure is fixed on one side of the inner tube, the hardness of the arc-shaped sheet structure is greater than that of the rest positions of the cylindrical structure, the side where the arc-shaped sheet structure is located is the hard side, and the side opposite to the arc-shaped sheet structure is the soft side.

[0019] Preferably, the catheter is made of shape memory alloy or superelastic alloy or medical grade stainless steel.

[0020] Preferably, a protection umbrella frame is fixed at the front end of the guide wire, the protection umbrella frame is made of shape memory alloy, and the protection umbrella frame expands into an umbrella shape after entering the blood vessel.

[0021] The vascular atherectomy and dredging device provided by the present invention has the following beneficial effects compared with the prior art: The guide wire passes through the catheter, the cutting head, the torque shaft and the shaft cavity in the outer shell and extends out of the outer shell, providing guidance for the advancement of the vascular atherectomy and dredging device. The torque shaft transmits the rotational power of the driving device to the cutting head. The cutting head rotates relative to the outer shell or rotates synchronously with the outer shell. The cutting edge of the cutting head cuts the blockage in the blood vessel, and the shredded residue after cutting is adsorbed into the catheter from the opening under the action of the negative pressure device and then discharged. This device improves the cutting efficiency of the blockage in the blood vessel, improves the surgical efficiency and is convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Figure 1 is a schematic structural diagram of the vascular atherectomy and dredging device;

[0024] Figure 2 is an exploded structural diagram of the vascular atherectomy and dredging device;

[0025] Figure 3 is a schematic diagram of the state of the vascular atherectomy and dredging device during operation;

[0026] Figure 4 is a schematic diagram of the driving principle of the drive shaft;

[0027] Figure 5 is a schematic structural diagram of the umbrella protector expanding on the guide wire.

[0028] In the figure, 1 is the catheter; 11 is the outer catheter; 12 is the inner catheter; 121 is the soft side; 122 is the arc-shaped sheet structure; 2 is the outer shell; 21 is the opening; 3 is the cutting head; 31 is the cutting edge; 32 is the spiral groove; 4 is the torque shaft; 41 is the spiral rib; 42 is the groove; 5 is the guiding cone; 51 is the cone cavity; 6 is the drive shaft; 61 is the central cavity; 7 is the gear; 8 is the negative pressure device; 9 is the guide wire; 10 is the umbrella protector; 100 is the blood vessel; 200 is the blockage. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other implementation manners obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope protected by the present invention.

[0030] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "side", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0031] The embodiment of the present invention provides a vascular rotational cutting and dredging device, which improves the rotational cutting efficiency of the blockages in blood vessels, improves the surgical efficiency, and is convenient to use.

[0032] The following Figures 1-4 elaborates on the technical solutions provided by the present invention in more detail.

[0033] As Figures 1-4 shown, the vascular rotational cutting and dredging device provided by the present invention includes a catheter 1, a rotational cutting head 3, a housing 2, and a torque shaft 4, where: the catheter 1 is in communication with a negative pressure device 8, the torque shaft 4 passes through the catheter 1, the torque shaft 4 is fixedly connected to the rotational cutting head 3, and when the torque shaft 4 is in transmission connection with a driving device, it is used to transmit rotational power to the rotational cutting head 3; an axial cavity is coaxially arranged in the catheter 1, the rotational cutting head 3, the torque shaft 4, and the housing 2, and the axial cavity is for a guide wire 9 to pass through; the rotational cutting head 3 includes a rotational cutting head 3 body and a blade part 31, the blade part 31 is fixed on the rotational cutting head 3 body, an opening 21 is provided on the housing 2, and at least part of the blade part 31 protrudes from the opening 21 for cutting the blockage 200 in the blood vessel 100, and the negative pressure device 8 can suck the cut debris into the catheter 1 through the opening 21 and then discharge it.

[0034] The blade part 31 of this embodiment adopts a nano-diamond coated blade, which significantly improves the cutting efficiency.

[0035] Among them, the driving device can be a power device in the prior art such as a motor. When the driving device drives the rotary cutting head 3 to rotate through the torque shaft 4, the protruding cutting edge 31 cuts the blockage 200 in the blood vessel 100. The debris generated by the cutting immediately enters the cavity of the catheter 1 through the opening 21 of the housing 2 under the action of negative pressure and is discharged out of the body through the discharge port at the end of the catheter 1. The guide wire passing through the shaft cavity can provide an axial movement track for the device, and when operating, advancing the device along the guide wire can avoid deviating from the lesion area. The edge of the opening 21 of the housing 2 maintains a micron-level gap with the cutting edge 31, which allows the debris to pass through and prevents soft tissues from being involved.

[0036] For the vascular rotational atherectomy device provided by the present invention, the guide wire 9 passes through the catheter 1, the rotary cutting head 3, the torque shaft 4 and the shaft cavity in the housing 2, and extends out of the housing 2 to provide guidance for the advancement of the vascular rotational atherectomy device. The torque shaft 4 transmits the rotational power of the driving device to the rotary cutting head 3. The rotary cutting head 3 rotates relative to the housing 2 or rotates synchronously with the housing 2. The cutting edge 31 of the rotary cutting head 3 rotates and cuts the blockage 200 in the blood vessel 100. The debris after cutting is adsorbed into the catheter 1 from the opening 21 under the action of the negative pressure device 8 and is thus discharged. This device improves the rotational cutting efficiency of the blockage 200 in the blood vessel 100, improves the surgical efficiency, and is convenient to use.

[0037] As an optional implementation manner, see Figure 2 As shown, a spiral groove 32 is provided on the body of the rotary cutting head 3. The spiral groove 32 is arranged along the axis of the body of the rotary cutting head 3 and is used to guide the debris into the catheter 1.

[0038] The helix angle of the spiral groove 32 can be controlled within the range of 15 - 45 degrees. The depth of the spiral groove 32 can be 5 - 15% of the diameter of the body of the rotary cutting head 3, forming a continuous channel for debris transportation. The axial arrangement means that the extending direction of the spiral groove 32 is parallel to the rotation center line of the rotary cutting head 3, ensuring that the debris moves axially under the action of centrifugal force. This structural feature avoids the disorderly accumulation of debris in the cutting area by guiding the flow direction of the debris. When the rotary cutting head 3 rotates at a high speed for cutting, the generated debris is thrown into the spiral groove 32 under the action of centrifugal force. The spiral direction of the spiral groove 32 matches the rotation direction of the rotary cutting head 3, so that the debris forms a spiral movement trajectory in the groove. This movement trajectory is consistent with the axial direction of the catheter 1, and the debris is transported along the spiral groove 32 to the opening 21 of the catheter 1. At this time, the negative pressure suction effect in the catheter 1 and the spiral transportation form a synergistic effect, and the debris is continuously sucked into the interior of the catheter 1. The groove width and depth design of the spiral groove 32 can adapt to the transportation requirements of debris with different viscosities, avoiding channel blockage caused by too large debris size.

[0039] The directional conveying function of the spiral groove 32 reduces the residence time of the crushed slag in the cutting area, and reduces the risk of blockage of the catheter 1 caused by the accumulation of crushed slag. At the same time, this structure avoids the problem of crushed slag dispersion caused by traditional simple negative pressure suction, ensures that the crushed slag enters the catheter 1 centrally and is discharged, and reduces the possibility of secondary embolism.

[0040] As an alternative implementation, the blade part 31 of this embodiment is a spiral structure, the number of openings 21 is more than two, and all the openings 21 are arranged around the axis of the housing 2.

[0041] The spiral blade reduces the instantaneous load through continuous cutting. This structure realizes the continuous and stable cutting of calcified plaques, reduces the mechanical impact on the wall of the blood vessel 100 during the operation, and reduces the risk of blockage of the blood vessel 100.

[0042] As an alternative implementation, see Figure 1 and Figure 2 As shown, a guiding cone 5 is provided at the end of the housing 2. The guiding cone 5 is provided with a conical cavity 51 penetrating through its two ends. The conical cavity 51 is communicated with the shaft cavity. The outer diameter of the guiding cone 5 gradually decreases in the direction away from the blade part 31. The guiding cone 5 is arranged coaxially with the housing 2 and is used to introduce the blockage 200 into the opening 21.

[0043] When the device is advanced in the blood vessel 100, the conical outer surface of the guiding cone 5 contacts the blockage 200 in the blood vessel 100. The gradually shrinking outer diameter causes the blockage 200 in the blood vessel 100 to be ground after contact and guided to the opening 21. Since the guiding cone 5 and the housing 2 remain coaxial, the direction of the guiding force received by the blockage 200 during movement is the same as the cutting direction of the rotary cutting head 3, so that it can accurately enter the opening 2 and be cut by the blade part 31. The crushed slag after cutting is sucked into the inside of the catheter 1 through the opening 21 under the action of the negative pressure device 8 and discharged, avoiding secondary blockage caused by the retention of the crushed slag in the blood vessel 100.

[0044] The above structure can realize the automatic aggregation and precise guidance of the blockage 200, improve the plaque removal efficiency and reduce the operation difficulty, and at the same time reduce the risk of damage to the wall of the blood vessel 100 caused by repeatedly adjusting the position of the device.

[0045] As an alternative implementation, see Figure 2 As shown, spiral ribs 41 are provided on the outer periphery of the torque shaft 4. The spiral ribs 41 extend spirally along the axis of the torque shaft 4. Spiral grooves 42 are formed between adjacent spiral ribs 41 for conveying the crushed slag out of the catheter 1 during rotation.

[0046] The spiral rib 41 refers to a convex structure distributed in a spiral shape along the surface of the torque shaft 4. Specifically, it can be realized by machining or molding processes. The spiral angle is designed within the range that can generate an axial conveying force. This structure generates a driving force when contacting the crushed slag during the rotation of the torque shaft 4. When the torque shaft 4 rotates driven by the driving device, the spiral rib 41 on its outer periphery contacts the crushed slag. Due to the cooperation between the extending direction of the spiral rib 41 and the rotation direction, a thrust along the axial direction is generated. Under the action of the thrust, the crushed slag moves along the spiral groove 42, forming a continuous conveyance from the inside to the outside of the conduit 1. During the rotation process, the frictional force between the spiral rib 41 and the crushed slag is converted into an axial displacement force. At the same time, the spiral layout of the groove 42 keeps the crushed slag in a dynamic conveyance state, avoiding blockage caused by static accumulation.

[0047] In this embodiment, the active discharge of the crushed slag is achieved, reducing the dependence on the negative pressure device 8, lowering the risk of equipment failure caused by the accumulation of crushed slag, and avoiding the operational complexity brought by the introduction of additional conveying components.

[0048] As an alternative implementation, referring to Figure 2 shown in the figure, the conduit 1 includes an outer sleeve 11 and an inner tube 12, where: the inner tube 12 is located within the outer sleeve 11, the torque shaft 4 passes through the inner tube 12 and is in transmission connection with the driving device, the torque shaft 4 rotates relative to the conduit 1, or the driving device is drivingly connected to the inner tube 12 to drive the inner tube 12 and the torque shaft 4 to rotate synchronously.

[0049] Specifically, referring to Figure 2 shown in the figure, the inner tube 12 includes a soft side 121 and a hard side arranged oppositely. The hardness of the soft side 121 is less than that of the hard side. When an axial force is applied to the conduit 1, the conduit 1 can only bend from the hard side towards the soft side 121.

[0050] Specifically, referring to Figure 2 shown in the figure, the inner tube 12 is a cylindrical structure woven from elastic wires. An arc-shaped sheet structure 122 is fixed on one side of the inner tube 12. The hardness of the arc-shaped sheet structure 122 is greater than the rest of the cylindrical structure. The side where the arc-shaped sheet structure 122 is located is the hard side, and the side opposite to the arc-shaped sheet structure 122 is the soft side 121.

[0051] The soft side 121 refers to the area in the inner tube 12 with a lower elastic modulus. Specifically, it can be realized by the un-reinforced area in the elastic wire woven structure. Its material yield strength is lower than that of the hard side and it preferentially undergoes plastic deformation. The hard side refers to the area in the inner tube 12 structure with a higher stiffness. Specifically, it can be formed by the composite of a metal arc-shaped sheet and an elastic wire woven structure. Its bending strength restricts the deformation direction of the conduit 1. This asymmetric structure forms a one-way bending constraint through the difference in material mechanical properties, avoiding structural instability caused by multi-directional bending.

[0052] When an axial thrust acts on the distal end of the catheter 1, the soft side 121 first undergoes elastic deformation due to the relatively low yield strength of the material, while the hard side maintains its original shape due to the rigid support. During the bending process, the hard side acts as a deformation constraint boundary, restricting the catheter 1 to bend in only one direction, forming a predictable bending trajectory. When advancing within the blood vessel 100, the operator adjusts the orientation of the hard side of the catheter 1 towards the wall of the blood vessel 100 by rotating the catheter 1, such that the bending occurs only in a predetermined direction away from the wall of the blood vessel 100, thereby avoiding mechanical damage to the intima of the blood vessel 100 caused by random bending of the catheter 1.

[0053] The structure of this embodiment effectively avoids the risk of perforation of the blood vessel 100 caused by multi-directional bending when the catheter 1 advances within the blood vessel 100, and simplifies the operation process at the same time. The doctor only needs to adjust the orientation of the hard side of the catheter 1 to control the bending direction, without frequently correcting the attitude of the catheter 1, significantly reducing the operation difficulty for the complex anatomical structure of the blood vessel 100.

[0054] As an alternative embodiment, the catheter 1 of this embodiment is made of shape memory alloy or superelastic alloy or medical-grade stainless steel.

[0055] As an alternative embodiment, referring to Figure 4 as shown, the vascular atherectomy device further includes a drive shaft 6, and the drive shaft 6 is drivingly connected to the torque shaft 4 or drivingly connected to the catheter 1.

[0056] Referring to Figure 4 as shown, the drive shaft 6 is provided with a central cavity 61 through which the guide wire 9 can pass. A driving device such as a motor drives the rotation of the drive shaft 6 through the gear 7 shown in the figure. The drive shaft 6 is connected to the catheter 1, and the catheter 1 and the torque shaft 4 rotate synchronously, or is connected to the torque shaft 4, and the torque shaft 4 rotates relative to the catheter 1.

[0057] Referring to Figure 5 as shown, a protective umbrella frame 10 is fixed to the front end of the guide wire 9. The protective umbrella frame 10 is made of shape memory alloy and expands into an umbrella shape after entering the blood vessel.

[0058] The guide wire 9 is made of medical stainless steel, and the protective umbrella frame 10 is made of nickel-titanium shape memory alloy. The characteristics of the material enable the protective umbrella frame 10 to expand after the guide wire enters the blood vessel, thereby playing a role in protecting the blood vessel and preventing it from being punctured.

[0059] A method for vascular atherectomy of the blood vessel 100 includes the following steps: inserting the catheter 1 system, positioning the plaque, starting the cutting head 3, synchronously performing negative pressure suction, and completing the operation.

[0060] This embodiment provides an atherectomy and dredging device and method, which can effectively remove plaques in blood vessel 100, reduce surgical risks and improve treatment effects through efficient cutting, safety protection, real-time imaging and simple operation. This device is applicable to the treatment of coronary atherosclerotic heart disease and has broad application prospects.

[0061] In the description of this specification, specific features, structures or characteristics may be combined in any one or more embodiments or examples in a suitable manner.

[0062] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0063] As mentioned above, the above are only the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An intravascular atherectomy and dredging device, characterized in that, It includes a catheter, a rotary cutting head, a housing, and a torque shaft, where: The catheter is connected to a negative pressure device. The torque shaft passes through the catheter. The torque shaft is fixedly connected to the rotary cutting head, and when the torque shaft is in transmission connection with a driving device, it is used to transmit rotational power to the rotary cutting head; An axial cavity is coaxially arranged within the catheter, the rotary cutting head, the torque shaft, and the housing, and the axial cavity is for a guide wire to pass through; The rotary cutting head includes a rotary cutting head body and a blade part. The blade part is fixed to the rotary cutting head body. An opening is provided on the housing, and at least part of the blade part protrudes from the opening for cutting the blockage in the blood vessel. The negative pressure device can suck the cut debris into the catheter through the opening and then discharge it.

2. The rotational atherectomy device according to claim 1, wherein, A spiral groove is provided on the rotary cutting head body. The spiral groove is arranged along the axis of the rotary cutting head body for guiding the debris into the catheter.

3. The rotational atherectomy device according to claim 1, wherein The blade part is of a spiral structure, and the number of the openings is more than two, and all the openings are arranged around the axis of the housing.

4. The rotational atherectomy device according to claim 1, characterized in that, A guiding cone is provided at the end of the housing. The guiding cone is provided with a conical cavity penetrating through its two ends. The conical cavity is connected to the axial cavity. The outer diameter of the guiding cone gradually decreases in the direction away from the blade part. The guiding cone and the housing are coaxially arranged for introducing the blockage into the opening.

5. The rotational atherectomy device according to claim 1, wherein, Spiral ribs are provided on the outer periphery of the torque shaft. The spiral ribs extend spirally along the axial direction of the torque shaft, and spiral grooves are formed between adjacent spiral ribs for conveying the debris out of the catheter during rotation.

6. The rotational atherectomy device according to claim 1, wherein The catheter includes an outer catheter and an inner catheter, where: The inner catheter is located within the outer catheter. The torque shaft passes through the inner catheter and is in transmission connection with the driving device. The torque shaft rotates relative to the catheter, or the driving device is in driving connection with the inner catheter for driving the inner catheter and the torque shaft to rotate synchronously.

7. The rotational atherectomy device according to claim 6, characterized in that, The inner catheter includes a soft side and a hard side arranged oppositely. The hardness of the soft side is less than that of the hard side. When an axial force is applied to the catheter, the catheter can only bend from the hard side towards the soft side.

8. The rotational atherectomy device according to claim 7, characterized in that, The inner catheter is a cylindrical structure woven by elastic wires. An arc-shaped sheet structure is fixed on one side of the inner catheter. The hardness of the arc-shaped sheet structure is greater than that of the rest of the cylindrical structure. The side where the arc-shaped sheet structure is located is the hard side, and the side opposite to the arc-shaped sheet structure is the soft side.

9. The rotational atherectomy device according to claim 7, wherein, The catheter is made of shape memory alloy, or superelastic alloy, or medical-grade stainless steel.

10. The rotational atherectomy device according to claim 1, wherein A protection umbrella frame is fixed at the front end of the guide wire. The protection umbrella frame is made of shape memory alloy and expands into an umbrella shape after entering the blood vessel.

Images