Rotational atherectomy device

Abstract

This invention relates to a rotary atherectomy device, which includes a grinding head and a drive shaft. The grinding head comprises a proximal end, a distal end, and a middle section, which are separately disposed between the proximal and distal ends. The drive shaft passes through the grinding head, and both the proximal and distal ends are fixedly connected to the drive shaft. The middle section has a first through hole for the drive shaft to pass through, the diameter of which is larger than the outer diameter of the drive shaft. This rotary atherectomy device improves the flexibility of the grinding head, preventing it from becoming stuck in tortuous blood vessels and ensuring smooth passage through such areas, thus increasing its throughput. Simultaneously, the grinding radius of the device can increase according to the diameter of the blood vessel, achieving rotary atherectomy that adapts to different vessel diameters.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a rotary grinding device. Background Technology

[0002] With the development of medical technology, rotational atherectomy has become an indispensable treatment method for the successful completion of percutaneous peripheral arterial intervention (PAI). It is also an important treatment for atherosclerosis. The principle of rotational atherectomy is to use a burr head to rotate at high speed at the site of vascular lesions to remove calcified or fibrotic atherosclerotic plaques, thereby opening up the blood vessels blocked by plaques and obtaining a smooth vascular lumen, facilitating the passage of subsequent medical devices such as balloons or stents through the lesion area.

[0003] However, traditional rotary atherectomy devices cannot adjust the grinding orifice size during the opening of vascular lesions. When treating arterial plaques, it is necessary to frequently change rotary atherectomy heads of different specifications to completely remove them. This is cumbersome, prolongs the operation time, and increases the patient's surgical pain and infection risk. Summary of the Invention

[0004] Therefore, it is necessary to provide a rotary atherectomy device to avoid the problem of frequent head changes during rotary atherectomy.

[0005] On one hand, this application provides a rotary grinding apparatus, comprising:

[0006] A grinding head, comprising a proximal end portion, a distal end portion, and a middle portion separately disposed therebetween, the middle portion being disposed between the proximal end portion and the distal end portion; and,

[0007] A drive shaft is provided, which passes through the grinding head, and both the proximal end and the distal end are fixedly connected to the drive shaft. The middle part has a first through hole for the drive shaft to pass through, and the diameter of the first through hole is larger than the outer diameter of the drive shaft.

[0008] The technical solution of this application will be further described below:

[0009] In one embodiment, the first through hole is an oblong hole, the length of which is greater than the outer diameter of the drive shaft; the width of which is greater than or equal to the outer diameter of the drive shaft.

[0010] In one embodiment, the central axis of the drive shaft, the central axis of the distal end, and the central axis of the proximal end are arranged collinearly.

[0011] In one embodiment, the outer diameter of the distal end gradually increases from the distal end to the proximal end; the outer diameter of the proximal end gradually decreases from the distal end to the proximal end.

[0012] In one embodiment, the middle portion is cylindrical; the outer surface of the distal end is a first curved surface whose outer diameter gradually increases from the distal end to the proximal end; and the outer surface of the proximal end is a second curved surface whose outer diameter gradually decreases from the distal end to the proximal end.

[0013] In one embodiment, the outer surface of the middle portion, the outer surface of the distal portion, and the outer surface of the proximal portion are all provided with grinding particles for grinding.

[0014] In one embodiment, the rotary grinding device further includes an outer sheath sleeved over the grinding head and the drive shaft, and the outer sheath sleeve is axially movable relative to the grinding head and the drive shaft.

[0015] In one embodiment, the outer sheath includes a coarse-diameter section, a variable-diameter section, and a fine-diameter section connected in sequence. The inner diameter of the coarse-diameter section is greater than or equal to the outer diameter of the intermediate portion, and the coarse-diameter section is used to accommodate the distal end portion and the intermediate portion. The inner diameter of the fine-diameter section is greater than or equal to the outer diameter of the drive shaft, and the fine-diameter section is used to accommodate the drive shaft. The inner diameter of the variable-diameter section gradually decreases from the inner diameter of the coarse-diameter section to the inner diameter of the fine-diameter section, and the variable-diameter section is used to accommodate the proximal end portion.

[0016] In one embodiment, the outer peripheral surface of the outer sheath is provided with a lubricating coating.

[0017] In one embodiment, the drive shaft includes a spring tube that passes through the grinding head and is used to transmit torque.

[0018] In one embodiment, both ends of the middle portion are provided with a first rounded corner; and / or, both ends of the distal portion are provided with a second rounded corner; and / or, both ends of the proximal portion are provided with a third rounded corner.

[0019] In one embodiment, the contact surface between the intermediate portion and the proximal end portion is provided with a first friction structure, and / or, the contact surface between the intermediate portion and the distal end portion is provided with a second friction structure.

[0020] The aforementioned rotary atherectomy device, by separately arranging the proximal, distal, and intermediate portions, and by making the diameter of the first through-hole in the intermediate portion larger than the outer diameter of the drive shaft, causes the central axis of the intermediate portion of the atherectomy head to deviate from the central axis of the drive shaft due to gravity after the atherectomy head reaches the target position, resulting in a centroid shift. The distance of this centroid shift is constrained by the size of the blood vessel lumen and increases with the increase of the blood vessel lumen radius. Furthermore, the maximum value of the centroid shift in the intermediate portion is limited by the size of the diameter of the first through-hole. After the rotary atherectomy is initiated, since the proximal and distal portions are fixedly connected to the drive shaft, the drive shaft can drive the proximal and distal portions to rotate at high speed around their own axes, thereby grinding and removing lesions within the blood vessel. Simultaneously, due to the centroid shift of the middle section and the fact that the diameter of the first through-hole in the middle section is larger than the outer diameter of the drive shaft, the drive shaft rotates around its own axis while simultaneously rotating around the central axis of the middle section within the first through-hole. This causes the proximal and distal ends to revolve around the central axis of the middle section along a circular track. Furthermore, as the opening radius of the blood vessel increases, the centroid shift distance of the middle section also increases, resulting in a larger revolve radius for the proximal and distal ends, and consequently, a larger grinding radius for both ends. At the same time, the middle section also rotates under the frictional force of the drive shaft, thus grinding the lesions within the blood vessel. Because of the centroid shift of the middle section, its grinding radius is greater than its maximum outer diameter. In other words, the grinding radius of the rotary atherectomy device increases according to the increase in blood vessel diameter, achieving rotary atherectomy that adapts to different blood vessel diameters. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a rotary milling device according to one embodiment;

[0024] Figure 2 This is a schematic diagram of the middle part of one embodiment;

[0025] Figure 3 This is a schematic diagram of the distal end of one embodiment;

[0026] Figure 4 This is a schematic diagram of the proximal end of one embodiment;

[0027] Figure 5 This is a schematic diagram of the structure of the outer sheath tube in one embodiment.

[0028] Explanation of reference numerals in the attached figures:

[0029] 10. Grinding head; 11. Proximal end; 111. Third distal end face; 112. Second curved surface; 113. Third proximal end face; 114. Second circular hole; 115. Central axis of the proximal end; 116. Third fillet; 12. Middle part; 121. First distal end face; 122. Cylindrical surface; 123. First proximal end face; 124. First through hole; 125. Central axis of the middle part; 126. First fillet; 13. Distal end; 131. Second distal end face; 132. First curved surface; 133. Second proximal end face; 134. First circular hole; 135. Central axis of the distal end; 136. Second fillet; 20. Drive shaft; 21. Central axis of the drive shaft; 30. Outer sheath; 31. Coarse diameter section; 32. Variable diameter section; 33. Fine diameter section. Detailed Implementation

[0030] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] In the description of this invention, "proximal end" refers to the end of the component that is closer to the operator; "distal end" refers to the end of the component that is farther away from the operator.

[0032] See Figures 1 to 2 Specifically, one embodiment of the rotary grinding device includes a grinding head 10 and a drive shaft 20. The grinding head 10 includes a proximal end 11, a distal end 13, and a middle part 12, which are separately disposed between the proximal end 11 and the distal end 13. The drive shaft 20 passes through the grinding head 10, and both the proximal end 11 and the distal end 13 are fixedly connected to the drive shaft 20. The middle part 12 has a first through hole 124 for the drive shaft 20 to pass through, and the diameter of the first through hole 124 is larger than the outer diameter of the drive shaft 20.

[0033] Specifically, the aforementioned rotary atherectomy device separates the proximal end 11, the distal end 13, and the intermediate part 12, meaning that the proximal end 11, the distal end 13, and the intermediate part 12 are not fixedly connected. Compared to the traditional one-piece atherectomy head 10, the split atherectomy head 10 of this application has better flexibility. As a result, when the rotary atherectomy device passes through the tortuous part of the blood vessel, the drive shaft 20 can bend between the proximal end 11 and the intermediate part 12 and between the distal end 13 and the intermediate part 12 of the split atherectomy head 10, avoiding the atherectomy head 10 getting stuck in the tortuous part of the blood vessel, ensuring that the rotary atherectomy device can pass through the tortuous part of the blood vessel smoothly, and increasing the passability of the rotary atherectomy device.

[0034] Meanwhile, since the diameter of the first through hole 124 in the middle part 12 is larger than the outer diameter of the drive shaft 20, after the grinding head 10 reaches the target position, the central axis 125 of the middle part 12 will deviate from the central axis 21 of the drive shaft due to gravity, resulting in a centroid shift. The distance of this centroid shift is constrained by the size of the blood vessel lumen and increases with the increase of the blood vessel lumen radius. Furthermore, the maximum value of the centroid shift of the middle part 12 is limited by the size of the diameter of the first through hole 124. After the rotary abrasion is started, since the proximal end 11 and the distal end 13 are fixedly connected to the drive shaft 20, the drive shaft 20 can drive the proximal end 11 and the distal end 13 to rotate at high speed around their own axis, thereby grinding and removing lesions in the blood vessels. Meanwhile, due to the offset of the center of mass of the middle part 12 and the fact that the diameter of the first through hole 124 opened in the middle part 12 is larger than the outer diameter of the drive shaft 20, the drive shaft 20 can rotate around the central axis 125 of the middle part in the first through hole 124 while rotating around the central axis 21 of its own drive shaft. This causes the proximal end 11 and the distal end 13 to revolve around the central axis 125 of the middle part along a circular track. As the opening radius of the blood vessel lumen increases, the offset distance of the center of mass of the middle part 12 increases accordingly, which in turn increases the revolve radius of the proximal end 11 and the distal end 13 around the central axis 125 of the middle part, thereby increasing the grinding radius of the proximal end 11 and the distal end 13. At the same time, the middle part 12 will also rotate under the frictional force with the drive shaft 20, thereby grinding the lesions in the blood vessel. Due to the centroid offset of the middle part 12, the grinding radius of the middle part 12 will be greater than the maximum outer diameter of the middle part 12. As the opening radius of the blood vessel lumen increases, the centroid offset distance of the middle part 12 increases, which in turn increases the grinding radius of the middle part 12. That is, the grinding radius of the rotary erosion device can increase according to the increase of the blood vessel diameter, realizing rotary erosion opening that can adapt to the blood vessel diameter.

[0035] See Figure 2In this embodiment, the overall shape of the intermediate portion 12 is a cylinder with a diameter of 1.5 mm to 3 mm and a length of 1 mm to 2 mm. Preferably, the minimum distance between the distal end portion 13 and the proximal end portion 11 is equal to the length of the intermediate portion 12, that is, both the distal end portion 13 and the proximal end portion 11 are in contact with the intermediate portion 12, so that when the distal end portion 13 and the proximal end portion 11 rotate, the intermediate portion can be driven to rotate by friction, thereby improving the grinding efficiency of the rotary grinding device.

[0036] Specifically, see Figure 2 The intermediate portion 12 includes a first distal surface 121, a first proximal surface 123, and a cylindrical surface 122 located between the first distal surface 121 and the first proximal surface 123. The cylindrical surface 122 is used for grinding to remove lesions from blood vessels. By shaping the intermediate portion 12 into a cylinder, it can better fit the tubular lumen of the blood vessel, thereby improving the grinding effect. Understandably, in other embodiments, the intermediate portion 12 may also have other shapes.

[0037] Furthermore, in this embodiment, the outer surface of the intermediate portion 12, i.e., the cylindrical surface 122, is provided with grinding particles for grinding. The grinding particles can increase the surface roughness of the cylindrical surface 122, thereby improving the grinding effect of the intermediate portion 12. Preferably, the grinding particles can be diamond particles, which have high hardness and good stability, and can effectively grind away plaques and other lesions in blood vessels. Furthermore, the diamond particles can be coated on the cylindrical surface 122 by electroplating or bonding with adhesives.

[0038] Furthermore, the edges at both ends of the middle portion 12, namely the edges of the first distal end face 121 and the first proximal end face 123, are chamfered with a first rounded corner 126, thereby avoiding sharp edges at the edges of the first distal end face 121 and the first proximal end face 123, thereby reducing the risk of blood vessel damage at both ends of the middle portion 12 and preventing wear on the proximal end face 11 and the distal end face 13 during high-speed rotary grinding. Preferably, the radius of the first rounded corner 126 is 0.05mm to 1mm.

[0039] Further, see also Figure 2 The first through hole 124 is an oblong hole, the length of which is greater than the outer diameter of the drive shaft 20. The width of the oblong hole is greater than or equal to the outer diameter of the drive shaft 20. The length of the oblong hole refers to the dimension at its maximum inner diameter, and the width refers to the dimension at its minimum inner diameter. Preferably, the length of the oblong hole is 1mm-1.5mm, and the width is 0.5mm-0.7mm.

[0040] By configuring the first through hole 124 as an oblong hole, when the grinding head 10 reaches the target position, under the influence of gravity, the middle part 12 will deviate from the central axis 21 of the drive shaft along the length of the oblong hole, resulting in a centroid offset. The distance of this centroid offset is constrained by the size of the blood vessel lumen and increases with the increase of the blood vessel lumen radius, and the maximum value of the centroid offset of the middle part 12 is half the length of the oblong hole. The centroid offset of the middle part 12 will make the grinding radius of the middle part 12 during rotation greater than the maximum outer diameter of the middle part 12, and as the opening radius of the blood vessel lumen increases, the centroid offset distance of the middle part increases, thereby increasing the grinding radius of the middle part 12. That is, the grinding radius of the rotary grinding device can increase according to the increase of the blood vessel diameter, realizing rotary grinding opening that can conform to the blood vessel diameter. It is worth noting that, in another embodiment, the first through hole 124 of the middle part 12 can also be a circular hole, and the diameter of the circular hole is larger than the outer diameter of the drive shaft 20. This also causes the center of gravity of the middle part 12 to shift, thereby enabling the grinding head 10 to rotate and open the blood vessel in accordance with the diameter of the blood vessel.

[0041] Continue to see Figures 1 to 4 The central axis 21 of the drive shaft, the central axis 135 of the distal end, and the central axis 115 of the distal end are collinear, meaning they coincide. This allows the distal end 13 and the proximal end 11 to rotate around their own central axes when the drive shaft 20 rotates, resulting in smoother grinding of the distal end 13 and the proximal end 11. It is worth noting that in another embodiment, the central axis 135 of the distal end or the central axis 115 of the proximal end can also be offset relative to the central axis 21 of the drive shaft, without affecting the rotary grinding function of the proximal end 11 and the distal end 13.

[0042] Further, see also Figure 1 The outer diameter of the distal end 13 gradually increases from the distal end to the proximal end, preventing the outer diameter of the burr head 10 from being too large to enter the stenotic lesion and improving the passability of the rotational atherectomy device. Furthermore, the outer diameter of the proximal end 11 gradually decreases from the distal end to the proximal end, thereby preventing the burr head 10 from being stuck at the stenotic site of the blood vessel during withdrawal and improving the retraction capability of the rotational atherectomy device.

[0043] See Figure 3Preferably, in this embodiment, the distal end 13 of the grinding head 10 is a hemisphere with a radius of 0.5mm-1.5mm. Preferably, the diameter of the distal end 13 is equal to the diameter of the intermediate portion 12, thereby making the transition from the distal end 13 to the intermediate portion 12 of the grinding head 10 smoother and further improving the passability of the grinding head 10. Specifically, the distal end 13 includes a second distal end face 131, a second proximal end face 133, and a first curved surface 132 located between the second distal end face 131 and the second proximal end face 133. The outer diameter of the first curved surface 132 gradually increases from the distal end to the proximal end. Preferably, the first curved surface 132 is a hemisphere. By setting the shape of the distal end 13 to a hemisphere, the grinding head 10 can more smoothly penetrate the narrow part of the blood vessel, thereby improving the passability of the grinding head 10. Understandably, in other embodiments, the shape of the distal end 13 can also be a cone, which can also increase the passability of the grinding head 10.

[0044] Furthermore, in this embodiment, the first curved surface 132 is used for grinding and removing lesions from blood vessels. Specifically, the outer surface of the distal end 13, i.e., the first curved surface 132, is also provided with grinding particles for grinding. The grinding particles can increase the roughness of the first curved surface 132, thereby improving the grinding effect of the first curved surface 132. Preferably, the grinding particles can be diamond particles, which have high hardness and good stability, and can effectively grind away plaques and other lesions in blood vessels. Furthermore, the diamond particles can be coated on the first curved surface 132 by electroplating or bonding with adhesives.

[0045] Furthermore, the two ends of the distal end 13, namely the edges of the second distal end face 131 and the second proximal end face 133, are both chamfered with a second rounded corner 136, thereby avoiding sharp edges on the edges of the second distal end face 131 and the second proximal end face 133, thereby reducing the risk of blood vessel damage at the two ends of the distal end 13. Preferably, the radius of the second rounded corner 136 is 0.05mm to 1mm.

[0046] Furthermore, the distal end 13 has a first circular hole 134 for the drive shaft 20 to pass through, and the centerline of the first circular hole 134 coincides with the central axis 135 of the distal end. Preferably, the diameter of the first circular hole 134 is 0.5mm to 0.7mm, and more preferably, the diameter of the first circular hole 134 is equal to the outer diameter of the drive shaft 20. The drive shaft 20 is fixed in the first circular hole 134 by welding or bonding. It is worth noting that in other embodiments, the distal end of the drive shaft 20 can also be directly fixed to the second proximal end face 133 of the distal end 13 by welding or bonding, thereby eliminating the need for the first through hole 124.

[0047] See Figure 4The proximal end portion 11 has the same shape as the distal end portion 13, both being hemispherical, and the proximal end portion 11 and the distal end portion 13 are symmetrical about the intermediate portion 12. Specifically, the proximal end portion 11 includes a third distal end face 111, a third proximal end face 113, and a second curved surface 112 located between the third distal end face 111 and the third proximal end face 113. The outer diameter of the second curved surface 112 gradually decreases from the distal end to the proximal end. Preferably, the second curved surface 112 is a hemispherical surface. By setting the shape of the distal end portion 13 to a hemispherical shape, the grinding head 10 can more smoothly exit the narrow part of the blood vessel when withdrawing, thereby improving the retraction of the grinding head 10. Understandably, in other embodiments, the shape of the distal end portion 13 can also be conical, which can also increase the passability of the grinding head 10. Further, in this embodiment, the second curved surface 112 is used to grind and remove lesions in the blood vessel. Specifically, the outer surface of the proximal end portion 11, i.e., the second curved surface 112, is also provided with grinding particles for grinding. Grinding particles can increase the roughness of the first curved surface 132, thereby improving the grinding effect of the first curved surface 132. Preferably, the grinding particles can be diamond particles. Further, the diamond particles can be coated on the second curved surface 112 by electroplating or bonding with adhesives.

[0048] Furthermore, the two ends of the proximal end 11, namely the edges of the third distal end face 111 and the third proximal end face 113, are both chamfered with a third rounded corner 116, thereby avoiding sharp edges on the edges of the third distal end face 111 and the third proximal end face 113, thereby reducing the risk of blood vessel damage at the two ends of the proximal end 11. Preferably, the radius of the second rounded corner 136 is 0.05mm to 1mm.

[0049] Furthermore, a second circular hole 114 for the drive shaft 20 to pass through is provided on the proximal end 11, and the center line of the second circular hole 114 coincides with the central axis 115 of the proximal end. Preferably, the diameter of the second circular hole 114 is 0.5 mm to 0.7 mm, and more preferably, the diameter of the second circular hole 114 is equal to the outer diameter of the drive shaft 20. The drive shaft 20 is fixed in the second circular hole 114 by welding or bonding.

[0050] See Figure 1 as well as Figure 5 The rotary abrasion device also includes an outer sheath 30, which is sleeved on the grinding head 10 and the drive shaft 20, and the outer sheath 30 can move axially relative to the grinding head 10 and the drive shaft 20. The outer sheath 30 is used to house the grinding head 10, thereby preventing the grinding head 10 from scratching the normal blood vessel wall before it is delivered to the vascular lesion site. After the grinding head 10 is delivered to the vascular lesion site, the outer sheath 30 is retracted to expose the grinding head 10, and then the grinding head 10 is driven to rotate by the drive shaft 20, thus achieving grinding of the vascular lesion site.

[0051] Specifically, the outer sheath 30 includes a coarse-diameter section 31, a variable-diameter section 32, and a fine-diameter section 33 connected in sequence. The inner diameter of the coarse-diameter section 31 is greater than or equal to the outer diameter of the intermediate portion 12. Preferably, the inner diameter of the coarse-diameter section 31 is 1.5mm-3mm. The coarse-diameter section 31 is used to house the distal end 13 and the intermediate portion 12 of the grinding head 10. The inner diameter of the fine-diameter section 33 is greater than or equal to the outer diameter of the drive shaft 20. Preferably, the outer diameter of the fine-diameter section 33 is 4f (1.32mm). The fine-diameter section 33 is used to house the drive shaft 20. The inner diameter of the variable-diameter section 32 gradually decreases from the inner diameter of the coarse-diameter section 31 to the inner diameter of the fine-diameter section 33. Preferably, the variable-diameter section 32 is hemispherical and is used to house the proximal end 11.

[0052] Preferably, the inner diameter of the coarse-diameter section 31 is equal to the outer diameter of the intermediate section 12, the inner diameter of the variable-diameter section 32 is the same as the outer diameter of the proximal section, and the inner diameter of the fine-diameter section 33 is equal to the outer diameter of the drive shaft 20. This ensures the coaxiality of the grinding head 10 and the drive shaft 20 when the outer sheath 30 houses the grinding head 10 and the drive shaft 20, thereby reducing the pushing resistance. Preferably, the wall thickness of the coarse-diameter section 31, the wall thickness of the variable-diameter section 32, and the wall thickness of the fine-diameter section 33 are the same.

[0053] Preferably, the outer sheath 30 can be a polymer tubing or a multi-layer braided tubing, and the outer peripheral surface of the outer sheath 30 is provided with a lubricating coating, which can be a hydrophilic coating, thereby reducing the friction force experienced by the outer sheath 30 in the blood vessel, allowing the outer sheath 30 to pass through the blood vessel more smoothly and ensuring the passability of the outer sheath 30.

[0054] See Figure 1 In this embodiment, the drive shaft 20 is a flexible drive shaft. Specifically, the drive shaft 20 includes a spring tube that passes through the grinding head 10 and is used to transmit torque. Understandably, the spring tube has a certain elastic deformation capacity and can bend to conform to the curvature of the blood vessel. Combined with the split grinding head 10 of this application, when the rotary erosion device passes through the tortuous part of the blood vessel, the drive shaft 20 can bend between the proximal end 11 and the middle part 12 of the split grinding head 10 and between the distal end 13 and the middle part 12, preventing the grinding head 10 from getting stuck in the tortuous part of the blood vessel, ensuring that the rotary erosion device can smoothly pass through the tortuous part of the blood vessel, and increasing the passability of the rotary erosion device. Preferably, the spring tube is made of single or multiple strands of stainless steel wire.

[0055] Furthermore, the contact surface between the intermediate portion 12 and the proximal end portion 11 is provided with a first friction structure, that is, both the first proximal end surface 123 of the intermediate portion 12 and the third distal end surface 111 of the proximal end portion 11 are provided with a first friction structure. Specifically, the first friction structure can be multiple protrusions or multiple grooves that can increase the surface roughness of the first proximal end surface 123 and the third distal end surface 111. Alternatively, the first friction structure can also be a coating that can increase the coefficient of friction of the first proximal end surface 123 and the third distal end surface 111, such as a silicone coating or a rubber coating. By providing a first friction structure on the contact surface between the intermediate portion 12 and the proximal end portion 11, the frictional force between the intermediate portion 12 and the proximal end portion 11 is increased, so that the proximal end portion 11 can drive the intermediate portion 12 to rotate when rotating, thereby improving the grinding efficiency of the grinding head 10.

[0056] Furthermore, the contact surface between the intermediate portion 12 and the distal portion 13 is provided with a second friction structure, that is, both the first distal surface 121 of the intermediate portion 12 and the second proximal surface 133 of the distal portion 13 are provided with a second friction structure. Specifically, the second friction structure can be multiple protrusions or multiple grooves that can increase the surface roughness of the first distal surface 121 and the second proximal surface 133. Alternatively, the second friction structure can also be a coating that can increase the coefficient of friction of the first distal surface 121 and the second proximal surface 133, such as a silicone coating or a rubber coating. By providing a second friction structure on the contact surface between the intermediate portion 12 and the distal portion 13, the frictional force between the intermediate portion 12 and the distal portion 13 is increased, so that the distal portion 13 can drive the intermediate portion 12 to rotate when rotating, thereby improving the grinding efficiency of the grinding head 10.

[0057] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

[0059] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0060] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0061] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0062] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0063] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

Claims

1. A rotary milling device, characterized in that, include: The grinding head includes a proximal end, a distal end, and a middle part that are separately disposed, with the middle part disposed between the proximal end and the distal end; as well as, A drive shaft passes through the grinding head, and both the proximal and distal ends are fixedly connected to the drive shaft. A first through hole for the drive shaft to pass through is provided in the middle portion. The diameter of the first through hole is larger than the outer diameter of the drive shaft. The first through hole is an oblong hole, and the length of the oblong hole is larger than the outer diameter of the drive shaft. The width of the oblong hole is greater than or equal to the outer diameter of the drive shaft, so that the central axis of the middle portion can deviate from the central axis of the drive shaft along the length direction of the oblong hole.

2. The rotary milling apparatus according to claim 1, characterized in that, The central axis of the drive shaft, the central axis of the distal end, and the central axis of the proximal end are arranged collinearly.

3. The rotary milling apparatus according to claim 1, characterized in that, The outer diameter of the distal end gradually increases from the distal end to the proximal end; the outer diameter of the proximal end gradually decreases from the distal end to the proximal end.

4. The rotary milling apparatus according to claim 3, characterized in that; The middle part is cylindrical; the outer surface of the distal end is a first curved surface whose outer diameter gradually increases from the distal end to the proximal end; the outer surface of the proximal end is a second curved surface whose outer diameter gradually decreases from the distal end to the proximal end.

5. The rotary milling apparatus according to claim 4, characterized in that, The outer surfaces of the middle portion, the distal portion, and the proximal portion are all provided with grinding particles for grinding.

6. The rotary milling apparatus according to claim 1, characterized in that, The rotary grinding device further includes an outer sheath, which is sleeved on the grinding head and the drive shaft, and the outer sheath can move axially relative to the grinding head and the drive shaft.

7. The rotary milling apparatus according to claim 6, characterized in that, The outer sheath includes a large-diameter section, a variable-diameter section, and a small-diameter section connected in sequence. The inner diameter of the large-diameter section is greater than or equal to the outer diameter of the middle portion, and the large-diameter section is used to accommodate the distal end portion and the middle portion. The inner diameter of the small-diameter section is greater than or equal to the outer diameter of the drive shaft, and the small-diameter section is used to accommodate the drive shaft. The inner diameter of the variable-diameter section gradually decreases from the inner diameter of the large-diameter section to the inner diameter of the small-diameter section, and the variable-diameter section is used to accommodate the proximal end portion.

8. The rotary milling apparatus according to claim 6, characterized in that, The outer circumferential surface of the outer sheath is provided with a lubricating coating.

9. The rotary milling apparatus according to claim 1, characterized in that, The drive shaft includes a spring tube that passes through the grinding head and is used to transmit torque.

10. The rotary milling apparatus according to claim 1, characterized in that, Both ends of the middle portion are provided with a first rounded corner; and / or both ends of the distal portion are provided with a second rounded corner; and / or both ends of the proximal portion are provided with a third rounded corner.

11. The rotary milling apparatus according to claim 1, characterized in that, The contact surface between the middle portion and the proximal end portion is provided with a first friction structure; and / or, the contact surface between the middle portion and the distal end portion is provided with a second friction structure.

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