Eccentric rotary grinding head and interventional medical device

Abstract

The utility model provides an eccentric rotary grinding head and an interventional medical device, the eccentric rotary grinding head comprises an eccentric main body and an abrasive particle layer, the eccentric main body comprises an outer side surface surrounding a connecting hole, and the abrasive particle layer is arranged on the outer side surface; the outer side surface comprises a first curved surface, a second curved surface and a third curved surface, and the second curved surface is located between the first curved surface and the third curved surface; the far end of the eccentric main body comprises a frustum-like first part, the outer side surface of the first part is the first curved surface, the radial size of the minimum end surface of the first part is 0.25-0.8 mm, the axial length of the minimum end surface of the first part is 0.4-3mm, and the included angle between the outer side surface of the first part and the central shaft is 20-60 degrees. According to the eccentric rotary grinding head and the interventional medical device, in the operation process, the first part can well play a role in opening a blood vessel, other parts of the eccentric rotary grinding head can further conduct rotary grinding expansion on the blood vessel conveniently, and the rotary grinding effect and efficiency are optimized.

Description

Technical Field

[0001] The utility model relates to the field of medical equipment, in particular to an eccentric grinding head and an interventional medical device. Background Art

[0002] As people's living standards improve and their eating habits change, vascular health has become a topic of great concern to the public. For example, people are increasingly concerned about the solution to the problem of atherosclerosis, which refers to the deposition of blood components such as lipids in the intima of the arteries, the proliferation of smooth muscle cells and the increase of collagen fibers, the formation of porridge-like lipid-containing necrotic lesions and vascular wall hardening, that is, fat, fiber, and calcium are deposited on the blood vessel wall to form plaques, which hinder the normal circulation of blood and lead to blood vessel blockage.

[0003] One of the key links in the existing solutions to the problem of atherosclerosis is how to remove severe plaques to increase the effective space of the blood vessels for subsequent treatment. The conventional practice in the industry is to insert an eccentric atherectomy head into the location of the plaque, atherectomize the plaque, and then remove the plaque. However, the atherectomy effect of existing atherectomy heads is not ideal, especially in the case of severe blood vessel obstruction, the problem of low atherectomy efficiency is particularly prominent. Utility Model Content

[0004] Based on the above situation, the main purpose of the utility model is to provide an eccentric grinding head and an interventional medical device.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: an eccentric atherectomy head is provided, the eccentric atherectomy head has a connection hole connected to a flexible driving shaft, the eccentric atherectomy head comprises an eccentric body and an abrasive layer, the eccentric body comprises an outer side surface surrounding the connection hole, and the abrasive layer is arranged on the outer side surface;

[0006] The outer side surface includes a first curved surface, a second curved surface and a third curved surface, the second curved surface is located between the first curved surface and the third curved surface, the first curved surface and the third curved surface are located on a revolved curved surface, and the second curved surface is located on a cylindrical surface; wherein the revolved curved surface is formed by revolving a revolved curve around the central axis of the connecting hole, the revolved curve includes a first curved segment and a second curved segment connected, the first curved surface and the third curved surface are respectively located on the curved surface formed by revolving the first curved segment and the second curved segment; the distance from each point on the first curved segment and the second curved segment to the central axis gradually decreases from the connecting point of the first curved segment and the second curved segment to the direction away from the connecting point; the axis centerline of the cylindrical surface is parallel to the central axis and has a distance;

[0007] The distal end of the eccentric body includes a first part that is shaped like a frustum of a cone, the outer side surfaces of the first part are all the first curved surfaces, the radial dimension of the smallest end surface of the first part is 0.25-0.8 mm, the axial length is 0.4-3 mm, and the angle between the outer side surface of the first part and the central axis is 20°-60°.

[0008] Preferably, the eccentric body comprises a second part connected to the first part, and the outer side surface of the second part comprises the first curved surface, the second curved surface and the third curved surface;

[0009] The portion of the eccentric body located on one side of the cross section is the first portion, and the portion located on the other side of the cross section is the second portion. The cross section is a cross section of the eccentric body passing through the distal end of the second curved surface.

[0010] Preferably, the rotation curve is tangent to the cylindrical surface at the connection point; the axial length of the first part is 0.4-1.2 mm, and the angle between the outer side surface of the first part and the central axis is 40°-60°.

[0011] Preferably, an axial length ratio of the first portion and the second portion is 1:(3-5); an area ratio of the first curved surface, the second curved surface and the third curved surface is (2-4):(2.5-6):1.

[0012] Preferably, the first curved surface, the second curved surface and the third curved surface intersect at the connection point; the distance ratio from the connection point to the distal end and the proximal end of the eccentric body is (2-3): 1;

[0013] The intersections of the first curved surface, the second curved surface and the third curved surface form an intersecting line, and the intersecting line is in a smoothly transitioned figure-8 shape.

[0014] Preferably, the first curved surface and the third curved surface have no intersection, and the angle between the outer side surface of the first part and the central axis is 20°-40°.

[0015] Preferably, an axial length ratio of the first portion and the second portion is 1:(4-9); an area ratio of the first curved surface, the second curved surface and the third curved surface is (1.2-3):(5-10):1.

[0016] Preferably, the end surface of the distal end of the eccentric body is an arc surface convex outward.

[0017] Preferably, the maximum radial dimension of the second portion is 0.9 mm-2 mm; the distance between the axis and the central axis is 0.05 mm to 0.6 mm.

[0018] Preferably, the connecting hole comprises a first connecting hole and a second connecting hole which are coaxially arranged and interconnected; and the first part and the second part are integrally formed.

[0019] Preferably, a groove is provided on the second part, the groove passes through the side wall of the second part and extends from the second curved surface to the proximal end; the length of the groove is 60-90% of the length of the second part; and the width is 0.2-0.6 mm.

[0020] The utility model also provides an interventional medical device, comprising a flexible driving shaft and the eccentric grinding head as described above, wherein the flexible driving shaft passes through the connecting hole and is fixedly connected to the eccentric body.

[0021] When the eccentric atherectomy head and interventional medical device provided by the utility model start working, the first part of the distal end can be well extended into the position of the blood vessel blocked by the plaque. Under the rotation of the flexible driving shaft, the eccentric atherectomy head rotates. Since the first part is a frustum-like shape, and the radial dimension of the smallest end face of the first part is 0.25-0.8mm, the axial length is 0.4-3mm, and the angle between the outer side and the central axis is 20°-60°, the first part can well play the role of opening the blood vessel, which is convenient for other parts of the eccentric atherectomy head to further atherectomize and expand the blood vessel, thereby optimizing the atherectomy effect and improving the atherectomy efficiency.

[0022] Other beneficial effects of the utility model will be explained through the introduction of specific technical features and technical solutions in the specific implementation manner. Through the introduction of these technical features and technical solutions, those skilled in the art should be able to understand the beneficial technical effects brought about by the technical features and technical solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The following will describe the preferred implementation of an eccentric grinding head and an interventional medical device according to the utility model with reference to the accompanying drawings.

[0024] Figure 1 and Figure 2 The three-dimensional structure diagram of the eccentric atherectomy head at different viewing angles is shown as viewed from the far end of the eccentric atherectomy head according to the first embodiment of the present invention.

[0025] Figure 3 and Figure 4 The three-dimensional structure diagram of the eccentric atherectomy head at different viewing angles is shown as viewed from the proximal end of the eccentric atherectomy head according to the first embodiment of the present invention.

[0026] Figure 5 It is a cross-sectional schematic diagram of the eccentric atherectomy head according to the first embodiment of the utility model.

[0027] Figure 6It is a schematic diagram of the three-dimensional structure of the eccentric grinding head according to the second embodiment of the utility model.

[0028] Figure 7 It is a bottom view of the structure of the eccentric atherectomy head according to the second embodiment of the utility model.

[0029] Figure 8 (a) to (d) are illustrations of the effects of using interventional medical devices. DETAILED DESCRIPTION

[0030] The present invention is described below based on embodiments, but the present invention is not limited to these embodiments. In the following detailed description of the present invention, some specific details are described in detail. In order to avoid confusing the essence of the present invention, known methods, processes, procedures, and components are not described in detail.

[0031] In addition, persons of ordinary skill in the art will appreciate that the drawings provided herein are for illustration purposes and are not necessarily drawn to scale.

[0032] Unless the context clearly requires otherwise, throughout the specification and claims, the words "include", "comprising" and similar words should be interpreted in an inclusive sense rather than an exclusive or exhaustive sense; that is, in the sense of "including but not limited to".

[0033] In the description of the present invention, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0034] It should be noted that, in the description of the present invention, "far" and "near" are relative to the operator of the equipment / device / device. The proximal end refers to the end close to the operator, and the distal end refers to the end far away from the operator. That is, for the same component, if it is only partially extended into the patient's body, the end extending into the patient's body is the distal end, and the end located outside the body close to the operator is the proximal end.

[0035] The eccentric grinding head provided by the present invention can be used to treat cardiovascular diseases and perform atherosclerosis resection. The following description is made using plaque blocking blood vessels as an example. It can be understood that this is only an exemplary description and does not limit the application scenarios of the eccentric grinding head provided by the present invention.

[0036] The utility model provides an eccentric laparoscopic grinding head, which has a connection hole connected to a flexible driving shaft. The eccentric laparoscopic grinding head comprises an eccentric body and an abrasive layer. The eccentric body comprises an outer side surface surrounding the connection hole, and the abrasive layer is arranged on the outer side surface.

[0037] The outer side surface includes a first curved surface, a second curved surface and a third curved surface, the second curved surface is located between the first curved surface and the third curved surface, the first curved surface and the third curved surface are located on a revolved curved surface, and the second curved surface is located on a cylindrical surface; wherein, the revolved curved surface is formed by revolving a revolved curve around the central axis of the connecting hole, the revolved curve includes a first curved segment and a second curved segment connected, the first curved surface and the second curved surface are respectively located on the curved surfaces formed by revolving the first curved segment and the second curved segment; the distance from each point on the first curved segment and the second curved segment to the central axis gradually decreases from the connecting point of the first curved segment and the second curved segment to the direction away from the connecting point; the axis line of the cylindrical surface is parallel to the central axis and has a distance, and the revolved curve is tangent to the cylindrical surface at the connecting point.

[0038] The distal end of the eccentric body includes a first part that is shaped like a frustum of a cone, the outer side surfaces of the first part are all the first curved surfaces, the radial dimension of the smallest end surface of the first part is 0.25-0.8 mm, the axial length is 0.4-3 mm, and the angle between the outer side surface of the first part and the central axis is 20°-60°.

[0039] It can be understood that when the eccentric atherectomy head provided by the utility model starts working, the first part of its distal end can be well extended into the position of the blood vessel blocked by the plaque. Under the rotation of the flexible driving shaft, the eccentric atherectomy head rotates. Since the first part is a frustum-like shape, and the radial dimension of the minimum end face of the first part is 0.25-0.8mm, the axial length is 0.4-3mm, and the inclination angle of the outer side surface is 20°-60°, the first part can well play the role of opening the blood vessel, which is convenient for other parts of the eccentric atherectomy head to further atherectomize and expand the blood vessel, thereby improving the atherectomy efficiency and optimizing the atherectomy effect.

[0040] See also Figures 1 to 4 The first embodiment of the utility model provides an eccentric atherectomy head 1, which is provided with a connection hole 15 for a flexible drive shaft (not shown) to pass through, and the flexible drive shaft passes through the connection hole 15 and is fixedly connected to the eccentric atherectomy head 1. The flexible drive shaft rotates to drive the eccentric atherectomy head 1 to rotate, thereby atherectomizing the plaque. At the same time, since the eccentric atherectomy head 1 has an eccentric design, during the rotation of the eccentric atherectomy head 1, the eccentric atherectomy head 1 applies a force to the plaque to destroy the plaque (such as crushing the plaque).

[0041] The eccentric grinding head 1 includes an eccentric body 10 and an abrasive layer (not shown), wherein the eccentric body 10 is the main part of the eccentric grinding head 1, and the abrasive layer is a layered object arranged on the surface of the eccentric body 10. It can be understood that the abrasive layer is formed on the surface of the eccentric body 10 by electroplating or other processes, and during grinding, the abrasive contacts the plaque to grind and / or remove the plaque.

[0042] The eccentric body 10 includes two opposite end faces and an outer side face, the outer side face is arranged around the connecting hole 15, and the abrasive layer is arranged on the side face. The two opposite end faces are respectively a distal end face a away from the operator and a proximal end face b close to the operator, and the connecting hole 15 passes through the two opposite end faces. The outer side face includes a first curved surface 11, a second curved surface 12 and a third curved surface 13, the second curved surface 12 is located between the first curved surface 11 and the third curved surface 13, the first curved surface 11 and the third curved surface 13 are located on the revolving curved surface, and the second curved surface 12 is located on the cylindrical surface.

[0043] Please read further Figure 5 The revolved curved surface is formed by revolving the revolved curve 20 around the central axis L1 of the connecting hole 15. As an embodiment, the revolved curve is a combination of one or more of a circular arc, an elliptical arc, a parabola or a hyperbola. The revolved curve includes a first curved segment h1 and a second curved segment h2 connected to each other, wherein the first curved surface 11 is located on the curved surface formed by revolving the first curved segment h1, and the third curved surface 13 is located on the curved surface formed by revolving the second curved segment h2. When the first curved segment h1 and the second curved segment h2 revolve, they rotate around the central axis L1 of the connecting hole 15.

[0044] It can be understood that the present invention introduces the revolution curved surface and the cylindrical surface in order to clearly describe the specific shape of the eccentric grinding head 1. In the actual product, there is no revolution curved surface and cylindrical surface formed by the revolution curve 20. The first curved surface 11 and the third curved surface 13 are only located on the revolution curved surface, which can also be understood as the outer side surface of the eccentric body 10 only includes a part of the revolution curved surface. The second curved surface 12 is only located on the cylindrical surface, which can also be understood as the outer side surface of the eccentric body 10 only includes a part of the cylindrical surface.

[0045] In this embodiment, the turning curve 20 is a curve that bulges away from the central axis L1. Specifically, the maximum distance between the turning curve 20 and the central axis L1 defines the boundary point between the first curve segment h1 and the second curve segment h2. The connection point (A) between the first curve segment h1 and the second curve segment h2 is the maximum distance between the turning curve 20 and the central axis L1. In the direction from the connection point to the far end (away from the connection point), the distance from each point on the first curve segment h1 to the central axis L1 gradually decreases; in the direction from the connection point to the proximal end (away from the connection point), the distance from each point on the second curve segment h2 to the central axis L1 gradually decreases.

[0046] In this embodiment, the axis line L2 of the cylindrical surface is parallel to the central axis L1 and has a distance therebetween. It can be understood that the cylindrical surface is obtained by rotating a straight line parallel to the central axis L1 around the axis line L2.

[0047] In this embodiment, the revolution curve 20 is tangent to the cylindrical surface at the connection point A. It can be understood that the revolution curve has only one tangent point with the cylindrical surface, and at this tangent point, the outer side surface has the maximum distance from the central axis L1. The tangent point is also the intersection of the first curved surface 11, the second curved surface 12 and the third curved surface 13, and is the only connection position of the first curved surface 11 and the third curved surface 13. It can be understood that there is at least one complete revolution curve 20 on the outer side.

[0048] As an embodiment, the outer side surface is a complete turning curve except for the turning curve 20 passing through the tangent point. At other positions, due to the existence of the second curved surface 12, the turning curve 20 only exists partially, such as at Figure 5 At the bottom, the first curved line segment h1 only exists at the left end portion, and the right end portion does not exist on the outer side surface.

[0049] It can be understood that the eccentric atherectomy head 10 forms line contact with the blood vessel wall only when it contacts the second curved surface 12, while the contacts with the blood vessel wall in other areas are all point contacts, especially when the outer surface is farthest from the central axis L1 and contacts with the blood vessel wall, it is also point contact, which avoids the formation of continuous line contact between the eccentric atherectomy head 10 and the plaque, thereby avoiding excessive impact force, which is not conducive to the control of the plaque removal process and increases the risk of surgery. In addition, the cooperation of the first curved surface 11, the second curved surface 12 and the third curved surface 13 can reduce the amount of grinding when the eccentric burr head 10 contacts the blood vessel wall at each position, thereby greatly reducing the impact of the eccentric burr head 10 on the blood vessel wall during burr grinding, making the entire burr grinding process relatively smooth, thereby improving the safety of the operation; at the same time, since both end portions of the entire outer side surface are outwardly convex smooth curved surfaces, gaps can be formed between these curved surfaces and most positions of the blood vessel wall in the axial direction, and less grinding chips are generated at the moment of point contact, so the grinding chips generated by burr grinding can also be well discharged from the gap between the curved surface and the blood vessel wall as soon as possible, and there will basically be no jamming or even blood vessel blockage caused by untimely discharge of grinding chips, thereby further improving the safety of the operation.

[0050] As an embodiment, the distance from the central axis L1 to the connection point A of the first curved segment h1 and the second curved segment h2 is R1, and the distance from the axis line L2 of the cylindrical surface to the connection point A is R2, that is, the radius of the cylindrical surface is R2, and R2 is smaller than R1. As an embodiment, the distance between the axis line L2 corresponding to the cylindrical surface and the central axis L1 corresponding to the connecting hole 15 (i.e., R1-R2) is 0.05mm to 0.6mm. Furthermore, the distance between the axis line L2 and the central axis L1 can be 0.1-0.3mm.

[0051] As an embodiment, in the axial direction, the distance from the distal end of the eccentric body 10 (i.e., the distal end face a) to the connection point A is greater than the distance from the proximal end of the eccentric body 10 (i.e., the distal end face b) to the connection point A. Preferably, the distance ratio between the two is (2-3):1. Under this distance ratio, while facilitating the eccentric atherectomy head to enter the lesion location, it is also beneficial to remove plaques. Furthermore, the distance ratio between the two is (2-2.5):1.

[0052] In this embodiment, the eccentric body 10 includes a first part 101 and a second part 102 connected to each other, and the part with the central axis L1 as the axis and the first curved surface 11 in the circumferential direction is the first part 101. As an embodiment, the first part 101 and the second part 102 are defined by a cross section, the part of the eccentric body 10 located on one side of the cross section is the first part 101, and the part located on the other side of the cross section is the second part 102, and the cross section is the cross section of the eccentric body 10 passing through the distal end of the second curved surface 12, that is, the cross section of the eccentric body 10 passes through the end point of the second curved surface 12 closest to the distal end surface a of the eccentric body 10.

[0053] In this embodiment, the first part 101 included in the eccentric body 10 is in a frustum-like shape, which is substantially the same as the frustum-like shape, except that the generatrix of the frustum-like shape is a curve. The radial dimension m of the smallest end face (i.e., the distal end face a) of the first part 101 is 0.25-0.8 mm, the axial length D1 is 0.4-3 mm, and the angle between the outer side surface of the first part 101 and the central axis L1 is 20°-60°.

[0054] When the eccentric atherectomy head 1 starts working, the first part 101 at its distal end can be well extended into the position of the blood vessel blocked by the plaque. Under the rotation of the flexible driving shaft, the eccentric atherectomy head 1 rotates. Since the first part 101 is a frustum-like shape, and the radial dimension of the smallest end face of the first part 101 is 0.25-0.8mm, the axial length is 0.4-3mm, and the angle between the outer side and the central axis L1 is 20°-60°, the first part 101 can well play the role of opening the blood vessel, which is convenient for other parts of the eccentric atherectomy head 1 to further expand the blood vessel through atherectomy, optimize the atherectomy effect, and improve the atherectomy efficiency.

[0055] As an embodiment, the radial dimension m of the smallest end surface of the first part 101 is 0.25-0.8 mm, the axial length D1 is 0.4-1.2 mm, and the angle between the outer side surface of the first part 101 and the central axis L1 is 40°-60°. Under this size parameter, the atherectomy effect can be further optimized, and the atherectomy effect is more significantly improved. Furthermore, the radial dimension m of the smallest end surface of the first part 101 is 0.35-0.6 mm, the axial length D1 is 0.6-1.2 mm, and the angle between the outer side surface of the first part 101 and the central axis L1 is 40°-50°.

[0056] As an embodiment, the distal end surface of the eccentric body 10 is an arc surface that bulges outward (along the central axis direction), which can ensure that the first part 101 can better extend into the lesion and avoid damage to human tissue during the operation.

[0057] As an embodiment, the outer side surface of the second part 102 included in the eccentric body 10 includes a first curved surface 11, a second curved surface 12 and a third curved surface 13, wherein the first curved surface 11 is connected to the first curved surface 11 included in the outer side surface of the first part 101. The first curved surface 11, the second curved surface 12 and the third curved surface 13 intersect each other to form an intersecting line, and the intersecting line is in a smoothly transitioned 8-shaped shape on the surface of the outer side surface.

[0058] As an embodiment, the axial length ratio of the first part 101 and the second part 102 is 1: (3-5); the area ratio of the first curved surface 11, the second curved surface 12 and the third curved surface 13 is (2-4): (2.5-6): 1. Under the said length ratio and area ratio, the point contact and line contact areas of the eccentric atherectomy head during atherectomy can be better controlled, and the efficiency and grinding ability of plaque removal can be controlled, so as to better achieve the treatment of vascular lesions at different diameters and positions, and avoid the strong impact force that may be caused by continuous line contact, thereby reducing the risk of surgery. Further, the axial length of the first part 101 and the second part 102 can be 1: (2.5-3.5); the area ratio of the first curved surface 11, the second curved surface 12 and the third curved surface 13 is (3-4): (3-4): 1.

[0059] As an embodiment, the maximum radial dimension of the second portion 102 is 0.9 mm to 2 mm. In some embodiments, the axial length of the second portion 102 is 1.0 mm to 7.0 mm.

[0060] As an embodiment, the roughness of the abrasive layer disposed on the first part 101 is greater than the roughness of the abrasive layer disposed on the second part 102, thereby reducing the resistance of the first part 101 entering the lesion area, which is beneficial to opening blood vessels.

[0061] As an embodiment, the first part 101 and the second part 102 are integrally formed. It is understandable that they can also be made in separate parts and then connected together.

[0062] As an embodiment, the connection hole 15 includes a first connection hole 151 and a second connection hole 152 which are coaxially arranged and interconnected. The size of the first connection hole 151 is smaller than that of the second connection hole 152. The size of the second connection hole 152 is larger, which facilitates the fixation between the flexible drive shaft and the eccentric grinding head.

[0063] See also Figure 6 and Figure 7 The second embodiment of the present utility model provides an eccentric grinding head 2, which is different from the eccentric grinding head 2 described in the first embodiment only as follows. It can be understood that, except for the following differences, the contents described in the first embodiment are also applicable to this embodiment.

[0064] In this embodiment, the first curved surface 21 and the third curved surface 23 of the eccentric atherectomy head 2 have no intersection, and the first curved surface 21 and the third curved surface 23 are separated by the second curved surface 22. During the operation of the eccentric atherectomy head 2, the linear contact area between the second curved surface 22 and the blood vessel wall increases, which can appropriately increase the impact force, and is suitable for some surgical scenarios that have certain requirements for impact strength.

[0065] In this embodiment, the first part 201 is shaped like a frustum, the radial dimension of the smallest end face of the first part 201 is 0.25-0.8 mm, the axial length D1 is 0.4-3 mm, and the angle between the outer side surface of the first part 101 and the central axis L1 is 20°-60°.

[0066] When the eccentric atherectomy head 2 starts working, the first part 201 at its distal end can be well extended into the position of the blood vessel blocked by the plaque. Under the rotation of the flexible driving shaft, the eccentric atherectomy head 2 rotates. Since the first part 201 is a frustum-like shape, and the radial dimension of the smallest end face of the first part 101 is 0.25-0.8mm, the axial length is 0.4-3mm, and the angle between the outer side and the central axis is 20°-60°, the first part 201 can well play the role of opening the blood vessel, which is convenient for other parts of the eccentric atherectomy head 2 to further expand the blood vessel through atherectomy, optimize the atherectomy effect, and improve the atherectomy efficiency.

[0067] As an embodiment, the radial dimension of the smallest end surface of the first part 201 is 0.25-0.8 mm, the axial length is 0.4-3 mm, and the angle between the outer side surface of the first part 201 and the central axis is 20°-40°. Under this size parameter, the atherectomy effect can be further optimized and the atherectomy effect is more significantly improved.

[0068] In this embodiment, the axial length ratio of the first portion 201 and the second portion 202 is 1:(4-9); the area ratio of the first curved surface 21, the second curved surface 22 and the third curved surface 23 is (1.2-3):(5-10):1. Under the length ratio and area ratio, the eccentric atherectomy head 2 can provide a suitable impact force to achieve a better atherectomy effect.

[0069] In this embodiment, a groove 221 is provided on the second part 202, and the groove 221 runs through the side wall of the second part 202 (i.e., the groove is connected to the connecting hole 25), and extends from the second curved surface 22 to the proximal end. The provision of the groove 221 can facilitate the fixation of the flexible drive shaft. For example, when the flexible drive shaft extends into the connecting hole 25, solder, glue, etc. can be injected into the groove 221 to better fix the flexible drive shaft inside the eccentric grinding head 2.

[0070] As an embodiment, the length of the groove 221 is 60-90% of the length of the second portion 202, and the width is 0.2-0.6 mm.

[0071] It can be understood that the arrangement of the groove 221 is applicable to the eccentric grinding head 1 in the first embodiment.

[0072] The utility model provides an interventional medical device, comprising a flexible driving shaft and the eccentric grinding head described in the above embodiment, wherein the flexible driving shaft passes through the connecting hole and is fixedly connected to the eccentric body.

[0073] See also Figure 8 (a) to (d), before using the interventional medical device provided by the utility model, the corresponding blood vessel aperture at the proximal end position (such as Figure 8 (a) is 0.4 mm, and the corresponding vascular pore size at the distal end (as shown in Figure 8 (b) is also 0.4 mm. The interventional medical device provided by the utility model is used for surgery, and the surgery includes a first stage and a second stage. In the first stage, the first part 101 opens the blood vessel, such as grinding for about 15-25 seconds, and the blood vessel space is expanded, and under the action of the eccentric force, a larger blood vessel space can be obtained. Figure 8 As shown in (c) and (d), the corresponding vascular pore diameters at the proximal and distal surfaces after the first stage both reach about 1.1 mm. In the second stage, the second part 102 performs a rotational grinding on the plaque. After about 90 seconds, the vascular pore diameter can reach about 2 mm, and after about 160 seconds, the vascular pore diameter reaches about 3.5 mm. The plaque removal effect is good and efficient.

[0074] Those skilled in the art will appreciate that, without conflict, the above-mentioned preferred solutions can be freely combined and superimposed.

[0075] It should be understood that the above-mentioned embodiments are merely illustrative and not restrictive. Without departing from the basic principles of the present invention, various obvious or equivalent modifications or substitutions that can be made by technicians in this field to the above details will be included in the scope of the claims of the present invention.

Claims

1. An eccentric atherectomy head having a connection hole connected to a flexible drive shaft, characterized in that: The eccentric grinding head comprises an eccentric body and an abrasive layer, wherein the eccentric body comprises an outer side surface surrounding the connecting hole, and the abrasive layer is arranged on the outer side surface; The outer side surface includes a first curved surface, a second curved surface and a third curved surface, the second curved surface is located between the first curved surface and the third curved surface, the first curved surface and the third curved surface are located on a revolved curved surface, and the second curved surface is located on a cylindrical surface; wherein the revolved curved surface is formed by revolving a revolved curve around the central axis of the connecting hole, the revolved curve includes a first curved segment and a second curved segment connected, the first curved surface and the third curved surface are respectively located on the curved surface formed by revolving the first curved segment and the second curved segment; the distance from each point on the first curved segment and the second curved segment to the central axis gradually decreases from the connecting point of the first curved segment and the second curved segment to the direction away from the connecting point; the axis centerline of the cylindrical surface is parallel to the central axis and has a distance; The distal end of the eccentric body includes a first part that is shaped like a frustum of a cone, the outer side surfaces of the first part are all the first curved surfaces, the radial dimension of the smallest end surface of the first part is 0.25-0.8 mm, the axial length is 0.4-3 mm, and the angle between the outer side surface of the first part and the central axis is 20°-60°.

2. The eccentric grinding head according to claim 1, characterized in that: The eccentric body comprises a second part connected to the first part, and the outer side surface of the second part comprises the first curved surface, the second curved surface and the third curved surface; The portion of the eccentric body located on one side of the cross section is the first portion, and the portion located on the other side of the cross section is the second portion. The cross section is a cross section of the eccentric body passing through the distal end of the second curved surface.

3. The eccentric grinding head according to claim 2, characterized in that: The rotation curve is tangent to the cylindrical surface at the connection point; the axial length of the first part is 0.4-1.2 mm, and the angle between the outer side surface of the first part and the central axis is 40°-60°.

4. The eccentric grinding head according to claim 3, characterized in that: The axial length ratio of the first part and the second part is 1:(3-5); the area ratio of the first curved surface, the second curved surface and the third curved surface is (2-4):(2.5-6):

1.

5. The eccentric grinding head according to claim 3, characterized in that: The first curved surface, the second curved surface and the third curved surface intersect at the connection point; the distance ratio from the connection point to the distal end and the proximal end of the eccentric body is (2-3): 1; The intersections of the first curved surface, the second curved surface and the third curved surface form an intersecting line, and the intersecting line is in a smoothly transitioned figure-8 shape.

6. The eccentric grinding head according to claim 2, characterized in that: The first curved surface and the third curved surface have no intersection, and the angle between the outer side surface of the first part and the central axis is 20°-40°.

7. The eccentric grinding head according to claim 6, characterized in that: The axial length ratio of the first part and the second part is 1:(4-9); the area ratio of the first curved surface, the second curved surface and the third curved surface is (1.2-3):(5-10):

1.

8. The eccentric grinding head according to any one of claims 1 to 7, characterized in that: The end surface of the distal end of the eccentric body is an arc surface convex outwards.

9. The eccentric grinding head according to any one of claims 2 to 7, characterized in that: The maximum radial dimension of the second part is 0.9 mm-2 mm; the distance between the axis line and the central axis is 0.05 mm to 0.6 mm.

10. The eccentric grinding head according to any one of claims 2 to 7, characterized in that: The connecting hole comprises a first connecting hole and a second connecting hole which are coaxially arranged and interconnected; the first part and the second part are integrally formed.

11. The eccentric grinding head according to claim 2, characterized in that: The second part is provided with a groove, which runs through the side wall of the second part and extends from the second curved surface to the proximal end; the length of the groove is 60-90% of the length of the second part, and the width is 0.2-0.6 mm.

12. An invasive medical device, characterized in that: It comprises a flexible driving shaft and the eccentric grinding head according to any one of claims 1 to 11, wherein the flexible driving shaft passes through the connecting hole and is fixedly connected to the eccentric body.

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