Multi-stage rotary grinding head, rotary grinding assembly and rotary grinding device

Abstract

The utility model belongs to the technical field of medical instruments, and relates to a multi-stage rotary grinding head, a rotary grinding assembly and a rotary grinding device. The rotary grinding head comprises a base body, and the base body comprises a plurality of convex faces sequentially arranged in the axial direction of the base body. The rotary grinding assembly comprises a rotating shaft and a multi-stage rotary grinding head, and the rotary grinding head is fixedly connected with the rotating shaft; the rotary grinding device comprises a multi-stage rotary grinding head or a rotary grinding assembly and further comprises a power source used for driving the rotary grinding head to rotate. Compared with the prior art, the rotary grinding opening efficiency can be improved, the operation time is shortened, and the clinical risk is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of medical apparatus and instruments, and relates to a multistage rotary grinding head, rotary grinding assembly and rotary grinding device. BACKGROUND

[0002] Atherosclerotic plaque in a blood vessel can limit blood flow, and if not treated, can lead to angina, high blood pressure, myocardial infarction, stroke and other diseases. At present, percutaneous transluminal rotational atherectomy has become a conventional technique for treating such diseases in the blood vessel. The technique mainly uses a rotary grinding head coated with abrasive material to rotate at high speed under the drive of a flexible drive shaft at a diseased stenotic tissue (atherosclerosis, calcified material, fibrous mass, etc.), grinds the diseased stenotic tissue into fine particles, and then the fine particles are gradually digested and absorbed by the reticuloendothelial system, thereby achieving the purpose of expanding the inner diameter of the blood vessel to a healthy inner diameter.

[0003] However, the existing rotary grinding head has low grinding efficiency when grinding the diseased stenotic tissue, resulting in a long time spent on opening the diseased stenotic tissue and a high surgical risk. SUMMARY

[0004] The utility model aims to provide a multistage rotary grinding head, rotary grinding assembly and rotary grinding device to improve the rotary grinding opening efficiency.

[0005] The utility model can achieve the purpose by the following technical scheme.

[0006] The utility model provides a multistage rotary grinding head in a first aspect, the rotary grinding head includes a base body, the base body includes a plurality of convex surfaces arranged in sequence along the axial direction of the base body.

[0007] Preferably, the number of convex surfaces is 2-12.

[0008] Preferably, the convex surfaces are obtained by cutting a spherical surface.

[0009] Preferably, the spherical surface is cut by a pair of parallel planes, and the part of the spherical surface cut between the pair of parallel planes forms the convex surface.

[0010] Preferably, along the axial direction of the base body, the centers of the spherical surfaces corresponding to the plurality of convex surfaces are located on the same straight line or curve, and the curve includes a spiral line, a broken line or an arc line.

[0011] Preferably, the radii of the spherical surfaces corresponding to the plurality of convex surfaces on the base body are completely the same, partially the same or completely different.

[0012] Preferably, the radii of the spherical surfaces corresponding to the plurality of convex surfaces gradually increase, or gradually decrease, or first increase and then decrease, or first decrease and then increase, or alternatively increase and decrease, along the axial direction of the base body.

[0013] Preferably, the axial dimensions of the plurality of convex surfaces on the base body are completely the same, or partially the same, or completely different.

[0014] Preferably, the axial dimensions of the plurality of convex surfaces gradually increase, or gradually decrease, or first increase and then decrease, or first decrease and then increase, or alternatively increase and decrease, along the axial direction of the base body.

[0015] Preferably, the two adjacent convex surfaces are in direct contact, or a transition surface is arranged between the two adjacent convex surfaces.

[0016] Preferably, the transition surface is concave or convex. When the transition surface is concave, the transition surface and the adjacent convex surface are smoothly connected; when the transition surface is convex, the convex height of the transition surface is less than the convex height of the convex surface.

[0017] Preferably, the transition surface is obtained by cutting a cylindrical surface, a conical surface or a spherical surface.

[0018] Preferably, the base body is provided with an entering section and an exiting section at two ends thereof, respectively.

[0019] Preferably, the entering section and the exiting section are obtained by cutting a spherical body, a cylindrical body or a conical body, and the entering section and the exiting section are smoothly connected with the base body.

[0020] Preferably, the entering section is provided with an entering section guide surface, and the exiting section is provided with an exiting section guide surface.

[0021] Preferably, the entering section guide surface and the exiting section guide surface are both arranged to be inclined relative to the axial direction of the base body, and the entering section guide surface and the exiting section guide surface are arranged to be opposite to each other in direction, and the inclination angles of the entering section guide surface and the exiting section guide surface are the same or different.

[0022] Preferably, the inclination angle of the entering section guide surface is less than the inclination angle of the exiting section guide surface.

[0023] Preferably, the entering section guide surface is a one-level guide structure or a multi-level guide structure, and the exiting section guide surface is a one-level guide structure or a multi-level guide structure.

[0024] Preferably, the entering section, the exiting section and the base body are integrally formed.

[0025] Preferably, the surface of the base body is provided with an abrasive coating, the surface of the entering section and / or the exiting section is provided with an abrasive coating, and the end faces of the two ends of the rotary grinding head are both flat.

[0026] The utility model discloses a second aspect provides a kind of rotary grinding assembly, which includes shaft and above-mentioned multistage rotary grinding head, the rotary grinding head is fixedly connected with the shaft.

[0027] Preferably, a shaft mounting groove is formed in the rotary grinding head along the axial direction of the base body, and a portion of the shaft is located in the shaft mounting groove and fixedly connected with the base body.

[0028] Preferably, the center of mass of the rotary grinding head is located on the central axis of the shaft, or the center of mass of the rotary grinding head deviates from the central axis of the shaft.

[0029] The utility model discloses a third aspect provides a kind of rotary grinding device, which includes above-mentioned multistage rotary grinding head or above-mentioned rotary grinding assembly;The rotary grinding device further includes power source for driving the rotary grinding head to rotate.

[0030] Preferably, the power source is a motor.

[0031] Compared with the prior art, the utility model has the following characteristics:

[0032] (1) The multistage structure formed by the combination of multiple convex surfaces ensures that the entire rotary grinding head can grind the diseased and narrow tissue step by step during rotation and advancement in the lumen, effectively improving the opening efficiency.

[0033] (2) The convex surfaces on the rotary grinding head are designed based on spherical surfaces, which ensures that the entire rotary grinding head can advance uniformly during rotation and advancement in the lumen, and the smooth transition of the multistage structure effectively reduces the risk of jamming.

[0034] (3) A transition surface is provided between two adjacent convex surfaces. When the rotary grinding head rotates and grinds the diseased and narrow tissue in the lumen, the transition surface can temporarily accommodate the falling objects after the adjacent convex surfaces grind the diseased and narrow tissue, effectively reducing the risk of jamming. In addition, the transition surface can also effectively increase the surface area of the abrasive coating on the rotary grinding head and reduce the size of the rotary grinding particles.

[0035] (4) The entering section and the exiting section are respectively provided at the two ends of the base body. The guiding effect of the entering section and the exiting section facilitates the smooth entry of the rotary grinding head into the diseased and narrow tissue area at the beginning of work, and the smooth exit of the rotary grinding head from the diseased and narrow tissue area at the end of work, thereby improving the opening efficiency and avoiding the jamming of the rotary grinding head during the retraction process after opening, reducing the clinical risk.

[0036] (5) the two ends of the rotary grinding head are both flat, which is convenient for clamping the rotary grinding head through the two ends when electroplating the grinding coating on the base, and improves the conductive contact area in the electroplating process, and further improves the electroplating yield. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 is a schematic diagram of the perspective structure of the rotary grinding head in Example 1;

[0038] Figure 2 is a schematic diagram of the front view structure of the rotary grinding head in Example 1;

[0039] Figure 3 is a schematic diagram of the top view structure of the rotary grinding head in Example 1;

[0040] Figure 4 is a schematic diagram of the bottom view structure of the rotary grinding head in Example 1;

[0041] Figure 5 is a schematic diagram of the left view structure of the rotary grinding head in Example 1;

[0042] Figure 6 is a schematic diagram of the front view structure of the rotary grinding head in Example 2;

[0043] Figure 7 is a schematic diagram of the front view structure of the rotary grinding head in Example 3;

[0044] Figure 8 is a schematic diagram of the front view structure of the rotary grinding head in Example 4;

[0045] Figure 9 is a schematic diagram of the front view structure of the rotary grinding head in Example 5;

[0046] MARK DESCRIPTION IN THE DRAWINGS:

[0047] 1-base, 2-convex surface, 3-transition surface, 4-entry section, 5-exit section, 6-entry section guide surface, 7-exit section guide surface, 8-rotating shaft mounting groove. DETAILED DESCRIPTION

[0048] The utility model will be described in detail below in combination with the drawings and specific embodiments. The following embodiments are implemented on the premise of the technical scheme of the utility model, and detailed implementation modes and specific operation processes are given, but the protection scope of the utility model is not limited to the following embodiments.

[0049] It should be noted that the terms used in the utility model are only for the purpose of describing specific embodiments, and are not intended to limit the utility model.

[0050] In the present application, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0051] In the present application, the term "and / or" means any or all possible combinations of one or more associated listed items. The term "or" is generally used in the inclusive sense unless the context clearly indicates otherwise.

[0052] In the present application, unless otherwise specified, the meaning of "a plurality of" is two or more, and the meaning of "several" is not limited in number.

[0053] In the present application, although the terms first, second, third, etc. can be used to describe various features, these features should not be limited to these terms, and these terms are only used to distinguish features of the same type from each other. For example, without departing from the scope of the present application, the first feature can also be referred to as the second feature, and similarly, the second feature can also be referred to as the first feature.

[0054] In the present application, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0055] In the present application, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly. For example, it can be a mechanical connection or an electrical connection, it can be a communication between two elements, it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0056] In the present application, the suffix such as "module", "component" or "unit" used to represent elements is only for the convenience of describing the present application, and has no specific meaning in itself. For example, "module" and "component" can be used interchangeably.

[0057] In the present application, in order to facilitate description, terms such as "distal end" and "proximal end" can be used. "Distal end" refers to the side away from the device operator, and "proximal end" refers to the side close to the device operator.

[0058] In addition, in order to avoid confusion with the present application, some technical features known in the art are not described.

[0059] The utility model provides a multistage rotary grinding head, as shown in the drawing, Figures 1 to 9 The rotary grinding head comprises a base body 1, and the base body 1 comprises a plurality of convex surfaces 2 arranged in sequence along the axial direction of the base body 1 (which can be from the distal end to the proximal end direction or from the proximal end to the distal end direction). The plurality of convex surfaces 2 on the side surface of the base body 1 form a multistage structure. When the rotary grinding head rotates in a lumen (for example, a blood vessel), the plurality of convex surfaces 2 perform multistage grinding on the diseased stenotic tissue along with the feeding movement of the rotary grinding head, thereby improving the rotary grinding opening efficiency.

[0060] Preferably, the number of convex surfaces 2 is 2-12, and more preferably 3-7, for example, 4 or 6.

[0061] Preferably, the convex surface 2 is obtained by cutting a spherical surface. More preferably, a ring-shaped or approximately ring-shaped part is cut from the spherical surface to obtain a spherical camber surface, that is, a convex surface 2 of a spherical surface type is formed, and the diseased stenotic tissue is ground by using the convex surface 2 of the spherical surface type on the base body 1. Further preferably, the spherical surface is cut by a pair of parallel planes, and the part of the spherical surface cut by the pair of parallel planes forms the convex surface 2. The convex surface 2 formed by cutting the spherical surface by the pair of parallel planes has a uniform axial dimension on each part, which can make the rotary grinding head more regular in shape and the grinding more uniform.

[0062] Preferably, the centers of the spherical surfaces corresponding to the plurality of convex surfaces 2 are located on the same straight line or curve, and the curve includes a spiral line, a broken line, or an arc line. Preferably, the centers of the spherical surfaces corresponding to the plurality of convex surfaces 2 are located on the same straight line, which not only makes the rotary grinding head more regular in shape, but also facilitates the machining and manufacturing of the rotary grinding head.

[0063] Preferably, the radii of the spherical surfaces corresponding to the plurality of convex surfaces 2 on the base body 1 are completely the same, partially the same, or completely different. More preferably, along the axial direction of the base body 1, the radii of the spherical surfaces corresponding to the plurality of convex surfaces 2 gradually increase, gradually decrease, first increase and then decrease, first decrease and then increase, or are alternately arranged in size. Still more preferably, the radii of the spherical surfaces corresponding to the plurality of convex surfaces 2 gradually increase (that is, the radial dimension or the convex height of the plurality of convex surfaces 2 gradually increases), or first increase and then decrease (that is, the radial dimension or the convex height of the plurality of convex surfaces 2 first increases and then decreases), so that the opening diameter gradually increases along with the feeding movement of the rotary grinding head in the lumen during the rotary grinding process.

[0064] Preferably, the axial dimensions of the plurality of convex surfaces 2 on the base body 1 are all the same, or partially the same, or all different. Further preferably, the axial dimensions of the plurality of convex surfaces 2 gradually increase, or gradually decrease, or first increase and then decrease, or first decrease and then increase, or alternatively, along the axial direction of the base body 1. Still further preferably, the axial dimensions of the convex surfaces 2 increase or decrease synchronously with the radial dimensions, that is, the convex surfaces 2 with larger radial dimensions have larger axial dimensions, and the convex surfaces 2 with smaller radial dimensions have smaller axial dimensions, so that the convex surfaces 2 with larger radial dimensions have a longer effective grinding time on the diseased and stenotic tissue during the rotational grinding process, thereby improving the grinding effect.

[0065] Preferably, the adjacent two convex surfaces 2 are in direct contact, or a transition surface 3 is arranged between the adjacent two convex surfaces 2 (that is, the adjacent two convex surfaces 2 are connected by the transition surface 3). Further preferably, the transition surface 3 is concave or convex. When the transition surface 3 is concave, the transition surface 3 and the adjacent convex surface 2 are smoothly connected, and the smooth connection can avoid the existence of sharp edges on the rotational grinding head to scratch the inner wall of the lumen. When the transition surface 3 is convex, the convex height of the transition surface 3 is smaller than the convex height of the convex surface 2.

[0066] Preferably, the transition surface 3 is obtained by cutting a cylinder, a cone or a sphere. The transition surface 3 can be combined by one or more types.

[0067] Preferably, the base body 1 is provided with an entry section 4 and an exit section 5 at two ends thereof. The entry section 4 is located at the distal end of the base body 1, so that the rotational grinding head can smoothly enter the diseased and stenotic tissue region at the beginning of the work. The exit section 5 is located at the proximal end of the base body 1, so that the rotational grinding head can smoothly exit the diseased and stenotic tissue region at the end of the work.

[0068] Preferably, the entry section 4 and the exit section 5 are obtained by cutting a sphere, a cylinder or a cone, and the entry section 4 and the exit section 5 are smoothly connected with the base body 1. Further preferably, the radial dimensions of the entry section 4 and the exit section 5 are smaller than the radial dimensions of the adjacent convex surfaces 2, so that the rotational grinding head can smoothly advance or retreat in the lumen.

[0069] Preferably, the entry section 4 is provided with an entry section guide surface 6, and the exit section 5 is provided with an exit section guide surface 7. Further preferably, the entry section guide surface 6 and the exit section guide surface 7 are both arranged to be axially inclined relative to the base body 1, and the entry section guide surface 6 and the exit section guide surface 7 are oppositely directed, and the inclination angles of the entry section guide surface 6 and the exit section guide surface 7 are the same or different. The radial dimension of the entry section guide surface 6 gradually increases from the distal end to the proximal end, and the radial dimension of the exit section guide surface 7 gradually decreases from the distal end to the proximal end.

[0070] Preferably, the inclination angle of the entry section guide surface 6 is smaller than the inclination angle of the exit section guide surface 7. The smaller inclination angle of the entry section guide surface 6 facilitates the gradual entry of the rotary grinding head into the diseased stenotic tissue region at the beginning of the operation, and the larger inclination angle of the exit section guide surface 7 facilitates the quick exit of the rotary grinding head from the diseased stenotic tissue region at the end of the operation.

[0071] Preferably, the entry section guide surface 6 is a single-stage guide structure or a multi-stage guide structure, and the exit section guide surface 7 is a single-stage guide structure or a multi-stage guide structure. If the entry section guide surface 6 and the exit section guide surface 7 are single planes or single curved surfaces, they are single-stage guide structures. If the entry section guide surface 6 and the exit section guide surface 7 are composed of two or more planes or curved surfaces (for example, in a wavy shape), they are multi-stage guide structures. The multi-stage guide structure can gradually push the rotary grinding head into the diseased stenotic tissue region in stages during the operation, thereby improving the opening efficiency.

[0072] Preferably, the entry section 4 and the exit section 5 are integrally formed with the base body 1. The entire rotary grinding head can be machined by cutting and / or grinding a cylindrical or cuboid metal (for example, stainless steel) block.

[0073] Preferably, the surface of the base body 1 is provided with a grinding coating, and the end faces of the two ends of the rotary grinding head are both flat surfaces (preferably, flat surfaces perpendicular to the axial direction of the base body 1). The grinding coating (for example, a diamond coating) can improve the grinding efficiency of the rotary grinding head on the diseased stenotic tissue. Preferably, the grinding coating is formed on the surface of the base body 1 by electroplating to improve the grinding performance and reduce the particle size of the grinding coating. The flat surfaces at the two ends of the rotary grinding head can increase the conductive contact area during the electroplating process and improve the yield of the electroplating. Further preferably, the surface of the entry section 4 and / or the exit section 5 can also be provided with a grinding coating, so that the rotary grinding head can also grind when it enters or exits the diseased stenotic tissue region, thereby improving the grinding efficiency.

[0074] The utility model discloses simultaneously provides a kind of rotary grinding assembly, and the rotary grinding assembly includes shaft and above-mentioned multi-stage rotary grinding head, rotary grinding head is fixedly connected (preferably rigidly fixed connection) with shaft. Shaft is preferably flexible multi-strand metal wire structure. The rotation of shaft drives rotary grinding head to rotate synchronously, realizes the grinding of diseased stenotic tissue.

[0075] Preferably, a shaft mounting groove 8 is formed in the base body 1 along the axial direction of the base body 1, and a part of the shaft is located in the shaft mounting groove 8 and is fixedly connected with the base body 1. The distal end of the shaft can be entirely located in the shaft mounting groove 8 without being exposed, or the distal end of the shaft can be located in the shaft mounting groove 8 with the distal end of the shaft exposed outside the shaft mounting groove 8.

[0076] Preferably, the center of mass of the rotary grinding head is located on the central axis of the rotating shaft, or the center of mass of the rotary grinding head deviates from the central axis of the rotating shaft. The rotary grinding head can adopt a concentric structure to ensure stability during rotation; or the rotary grinding head can adopt an eccentric structure to expand the opening diameter during rotation.

[0077] The utility model also provides a kind of rotary grinding device, and the rotary grinding device includes above-mentioned multistage rotary grinding head or includes above-mentioned rotary grinding assembly;Rotary grinding device further includes power source for driving rotary grinding head rotation. Preferably, the power source is motor. Under the driving of motor and other power sources, rotary grinding head rotates, and the pathological narrow tissue in lumen is ground.

[0078] Embodiment 1:

[0079] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , in the embodiment, the multistage rotary grinding head includes a base body 1, and four convex surfaces 2 are sequentially arranged on the base body 1 in the axial direction of the base body 1. Each convex surface 2 is formed by a pair of parallel planes intersecting a spherical surface. In the axial direction of the base body 1, the centers of the spherical surfaces corresponding to the four convex surfaces 2 are located on the same straight line. In the axial direction of the base body 1 (from the distal end to the proximal end), the radii of the spherical surfaces corresponding to the four convex surfaces 2 gradually increase, and the axial dimensions of the four convex surfaces 2 also gradually increase.

[0080] A transition surface 3 is arranged between adjacent two convex surfaces 2. The transition surface 3 is concave, and the transition surface 3 and the adjacent convex surface 2 are smoothly connected.

[0081] The two ends of the base body 1 are respectively provided with an entry section 4 and an exit section 5. The entry section 4 and the exit section 5 are both formed by a spherical body, and the entry section 4 and the exit section 5 are smoothly connected with the base body 1. The entry section 4 is provided with an entry section guide surface 6, and the exit section 5 is provided with an exit section guide surface 7. The entry section guide surface 6 and the exit section guide surface 7 are both arranged to be axially inclined relative to the base body 1, and the entry section guide surface 6 and the exit section guide surface 7 are oppositely directed. The inclination angle of the entry section guide surface 6 is smaller than that of the exit section guide surface 7. The entry section guide surface 6 is a one-level guide structure, and the exit section guide surface 7 is also a one-level guide structure.

[0082] The entry section 4 and the exit section 5 are integrally formed with the base body 1. The surfaces of the base body 1, the entry section 4 and the exit section 5 are all provided with a grinding coating, and the end faces of the two ends of the rotary grinding head are both flat.

[0083] Embodiment 2:

[0084] As shown in Figure 6 , different from embodiment 1, in the embodiment, the transition surface 3 is formed by a conical surface.

[0085] Embodiment 3:

[0086] As shown in Figure 7 different from embodiment 1, in this embodiment, the convex surface 2 is taken from a spherical surface, and along the axial direction of the base body 1, the centers of the spherical surfaces corresponding to the plurality of convex surfaces 2 are located on the same spiral line.

[0087] Embodiment 4:

[0088] As shown in Figure 8 different from embodiment 1, in this embodiment, the entry section guide surface 6 and the exit section guide surface 7 are both wavy multi-stage guide structures.

[0089] Embodiment 5:

[0090] As shown in Figure 9 different from embodiment 1, in this embodiment, along the axial direction of the base body 1 (from the distal end to the proximal end direction), the radii of the spherical surfaces corresponding to the plurality of convex surfaces 2 are alternately arranged in the order of first increasing, then decreasing, and then increasing.

[0091] Embodiment 6:

[0092] different from embodiment 1, in this embodiment, the number of convex surfaces 2 is 2, and the radii of the spherical surfaces corresponding to the two convex surfaces 2 are completely the same, and the axial dimensions of the two convex surfaces 2 are also completely the same. The transition surface 3 is outwardly convex and taken from a spherical surface, and the convex height of the transition surface 3 is smaller than the convex height of the convex surface 2.

[0093] Embodiment 7:

[0094] different from embodiment 1, in this embodiment, the number of convex surfaces 2 is 12, and the centers of the spherical surfaces corresponding to the convex surfaces 2 are located on the same arc line. Along the axial direction of the base body 1, the radii of the spherical surfaces corresponding to the 12 convex surfaces 2 first increase and then decrease, and the adjacent two convex surfaces 2 directly contact.

[0095] Embodiment 8:

[0096] different from embodiment 1, in this embodiment, the transition surface 3 is taken from a cylindrical surface. The entry section 4 and the exit section 5 are both taken from a cylinder.

[0097] Embodiment 9:

[0098] A rotary grinding assembly is obtained by fixedly connecting a rotary grinding head having the features of embodiment 1 with a rotating shaft. Among them, a rotating shaft mounting groove 8 is formed on the rotary grinding head along the axial direction of the base body 1, and a part of the rotating shaft is located in the rotating shaft mounting groove 8 and is fixedly connected with the base body 1. The center of mass of the rotary grinding head deviates from the central axis of the rotating shaft, forming an eccentric structure.

[0099] Embodiment 10:

[0100] A multi-stage rotary abrasive head with the features in Example 2 is fixedly connected with the rotating shaft to obtain a rotary abrasive assembly. The rotating shaft installation groove 8 is axially formed on the base body 1 of the rotary abrasive head, and a part of the rotating shaft is located in the rotating shaft installation groove 8 and fixedly connected with the base body 1. The center of mass of the rotary abrasive head deviates from the central axis of the rotating shaft to form an eccentric structure.

[0101] Example 11

[0102] A multi-stage rotary abrasive head with the features in Example 3 is fixedly connected with the rotating shaft to obtain a rotary abrasive assembly. The rotating shaft installation groove 8 is axially formed on the base body 1 of the rotary abrasive head, and a part of the rotating shaft is located in the rotating shaft installation groove 8 and fixedly connected with the base body 1. The center of mass of the rotary abrasive head is located on the central axis of the rotating shaft to form a concentric structure.

[0103] Example 12

[0104] A multi-stage rotary abrasive head with the features in Example 4 is fixedly connected with the rotating shaft to obtain a rotary abrasive assembly. The rotating shaft installation groove 8 is axially formed on the base body 1 of the rotary abrasive head, and a part of the rotating shaft is located in the rotating shaft installation groove 8 and fixedly connected with the base body 1. The center of mass of the rotary abrasive head deviates from the central axis of the rotating shaft to form an eccentric structure.

[0105] Example 13

[0106] A multi-stage rotary abrasive head with the features in Example 5 is fixedly connected with the rotating shaft to obtain a rotary abrasive assembly. The rotating shaft installation groove 8 is axially formed on the base body 1 of the rotary abrasive head, and a part of the rotating shaft is located in the rotating shaft installation groove 8 and fixedly connected with the base body 1. The center of mass of the rotary abrasive head deviates from the central axis of the rotating shaft to form an eccentric structure.

[0107] Example 14

[0108] A motor is used as a power source to drive the rotary abrasive head to rotate. The opening effect of the multi-stage rotary abrasive heads in Examples 1 to 5 is tested by using a blood vessel model, and a commercially available "Diamondback 360 vascular rotary abrasive system" is used as a control to compare the opening effects of similar rotary abrasive heads under the same conditions. The results are shown in Table 1 below.

[0109] Table 1

[0110] Atherectomy device Vessel model length Recanalization time Recanalization efficiency improvement rate Diamondback 360 10 mm T = 1.2 min / Example 1 10 mm t1= 0.8 min 33.3% Example 2 10 mm t2= 0.7 min 41.7% Example 3 10 mm t3= 0.9 min 25.0% Example 4 10 mm t4= 0.7 min 41.7% Example 5 10 mm t5= 0.8 min 33.3%

[0111] In Table 1 above, the opening efficiency improvement rate = (T-tn) / T, wherein T is the opening time of the Diamondback 360 rotary grinding head, and tn is the opening time of the rotary grinding head in Examples 1 to 5 (n = 1, 2, 3, 4, 5). As can be seen from Table 1 above, compared with the commercially available "Diamondback 360 vascular rotary grinding system", the opening efficiency of the multi-stage rotary grinding head in the present application can be improved by about 30%, thereby the operation time can be shortened, the clinical risk can be reduced, and the patient's pain can be alleviated.

[0112] The above description of the embodiments is to facilitate those of ordinary skill in the art to understand and use the present application. Those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described herein to other embodiments without creative labor. Therefore, the present application is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art within the scope of the present application without departing from the scope of the present application should be within the protection scope of the present application.

Claims

1. A multi-stage rotary abrasive head, comprising a base body (1), characterized in that, The base body (1) comprises a plurality of convex surfaces (2) arranged in sequence along the axial direction of the base body (1).

2. A multi-stage rotational atherectomy device according to claim 1, wherein: The number of the convex surfaces (2) is 2-12.

3. The multi-stage rotational atherectomy device of claim 1 wherein: The convex surfaces (2) are obtained by cutting a spherical surface.

4. A multi-stage rotational atherectomy device according to claim 3, wherein: The spherical surface is cut by a pair of parallel planes, and the part of the spherical surface cut by the pair of parallel planes forms the convex surface (2).

5. The multi-stage rotational atherectomy device of claim 3 wherein: Along the axial direction of the base body (1), the centers of the spherical surfaces corresponding to the plurality of convex surfaces (2) are located on the same straight line or curve, and the curve comprises a spiral line, a broken line or an arc line.

6. The multi-stage rotational atherectomy device of claim 3 wherein: The radii of the spherical surfaces corresponding to the plurality of convex surfaces (2) on the base body (1) are completely the same, partially the same or completely different.

7. A multi-stage rotational atherectomy device according to claim 6, wherein: Along the axial direction of the base body (1), the radii of the spherical surfaces corresponding to the plurality of convex surfaces (2) gradually increase, gradually decrease, first increase and then decrease, first decrease and then increase, or are arranged alternately in size.

8. The multi-stage rotational atherectomy device of claim 1 wherein: The axial dimensions of the plurality of convex surfaces (2) on the base body (1) are completely the same, partially the same or completely different.

9. A multi-stage rotational atherectomy device according to claim 8, wherein, Along the axial direction of the base body (1), the axial dimensions of the plurality of convex surfaces (2) gradually increase, gradually decrease, first increase and then decrease, first decrease and then increase, or are arranged alternately in size.

10. The multi-stage rotational atherectomy device of claim 1 wherein, The adjacent two convex surfaces (2) are directly in contact, or a transition surface (3) is arranged between the adjacent two convex surfaces (2).

11. A multi-stage rotational atherectomy device according to claim 10, wherein: The transition surface (3) is concave or convex. When the transition surface (3) is concave, the transition surface (3) and the adjacent convex surface (2) are smoothly connected; when the transition surface (3) is convex, the convex height of the transition surface (3) is less than the convex height of the convex surface (2).

12. The multi-stage rotational atherectomy device of claim 10 wherein: The transition surface (3) is obtained by cutting a cylindrical surface, a conical surface or a spherical surface.

13. The multi-stage rotational atherectomy device of claim 1 wherein: The base body (1) is respectively provided with an entering section (4) and an exiting section (5) at two ends.

14. The multi-stage rotational atherectomy device of claim 13 wherein: The entering section (4) and the exiting section (5) are obtained by cutting a spherical body, a cylindrical body or a conical body, and the entering section (4) and the exiting section (5) are smoothly connected with the base body (1).

15. The multi-stage rotational atherectomy device of claim 13 wherein: The entering section (4) is provided with an entering section guide surface (6), and the exiting section (5) is provided with an exiting section guide surface (7).

16. The multi-stage rotational atherectomy device of claim 15, wherein: The entering section guide surface (6) and the exiting section guide surface (7) are both arranged to be axially inclined relative to the base body (1), and the entering section guide surface (6) and the exiting section guide surface (7) are oppositely directed, and the inclination angles of the entering section guide surface (6) and the exiting section guide surface (7) are the same or different.

17. A multi-stage rotational atherectomy device according to claim 16, wherein: The inclination angle of the entering section guide surface (6) is less than the inclination angle of the exiting section guide surface (7).

18. The multi-stage rotational atherectomy device of claim 15, wherein: The entering section guide surface (6) is a one-stage guide structure or a multi-stage guide structure, and the exiting section guide surface (7) is a one-stage guide structure or a multi-stage guide structure.

19. The multi-stage rotational atherectomy device of claim 13 wherein: The entering section (4) and the exiting section (5) are integrally formed with the base body (1).

20. The multi-stage rotational atherectomy device of claim 13, wherein: The surface of the base body (1) is provided with a grinding coating, the surface of the entering section (4) and / or the surface of the exiting section (5) are provided with a grinding coating, and the end faces of the two ends of the rotary grinding head are both flat.

21. A rotational atherectomy device, comprising: The rotary grinding assembly comprises a rotating shaft and the multi-stage rotary grinding head according to any one of claims 1 to 20, and the rotary grinding head is fixedly connected with the rotating shaft.

22. The rotational atherectomy device of claim 21, wherein: An installation groove (8) for the rotating shaft is axially formed in the base body (1), and a part of the rotating shaft is located in the installation groove (8) and is fixedly connected with the base body (1).

23. The rotational atherectomy device of claim 21, wherein: The center of mass of the rotary grinding head is located on the central axis of the rotating shaft, or the center of mass of the rotary grinding head deviates from the central axis of the rotating shaft.

24. A rotational atherectomy device, comprising: The rotary grinding device comprises the multi-stage rotary grinding head according to any one of claims 1 to 20 or the rotary grinding assembly according to any one of claims 21 to 23, and further comprises a power source for driving the rotary grinding head to rotate.

25. The rotational atherectomy device of claim 24, wherein: The power source is an electric motor.

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