CN117257411A

CN117257411A - Rotary grinding device

Info

Publication number: CN117257411A
Application number: CN202210661774.3A
Authority: CN
Inventors: 赵承; 孔令娟; 刘梦钦; 郭澜涛
Original assignee: Shanghai Hongmai Medical Technology Co ltd
Current assignee: Shanghai Hongmai Medical Technology Co ltd
Priority date: 2022-06-13
Filing date: 2022-06-13
Publication date: 2023-12-22

Abstract

The invention relates to a rotary grinding device, which comprises a grinding head and a driving shaft, wherein the grinding head comprises a proximal end part, a distal end part and a middle part which are arranged in a split mode, and the middle part is arranged between the proximal end part and the distal end part. The drive shaft is worn to locate the bistrique to proximal end portion and distal end portion all with drive shaft fixed connection, the intermediate part has been seted up and is used for the first through-hole that the drive shaft penetrated, and the aperture of first through-hole is greater than the external diameter of drive shaft. The rotary grinding device improves the flexibility of the grinding head, avoids the grinding head from being embedded in the vascular tortuosity, ensures that the rotary grinding device can smoothly pass through the vascular tortuosity, and increases the trafficability of the rotary grinding device. Meanwhile, the grinding radius of the rotary grinding device can be increased according to the increase of the blood vessel diameter, so that rotary grinding opening which can conform to the blood vessel diameter is realized.

Description

Rotary grinding device

Technical Field

The invention relates to the technical field of medical instruments, in particular to a rotary grinding device.

Background

With the development of medical technology, rotational atherectomy has become an indispensable treatment for successful completion of percutaneous peripheral arterial intervention (Percutancous Peripheral Arterial Intervention). Simultaneously, the rotational atherectomy is also an important means for treating atherosclerosis. The principle of the rotational grinding operation is that a rotational grinding head is used for high-speed rotational grinding at a vascular lesion to remove calcified or fibrotic arteriosclerosis plaques, so that a blood vessel blocked by the arterial plaques is opened, a smooth blood vessel inner cavity is obtained, and the subsequent medical instruments such as a balloon or a stent system can conveniently pass through a lesion area.

However, the traditional rotary grinding device cannot adjust the size of the grinding aperture in the process of opening the vascular lesion region, and the rotary grinding heads with different specifications are required to be replaced frequently to thoroughly clean the arterial plaque, so that the operation is complicated, the operation time is prolonged, and the operation pain and the infection risk of a patient are increased.

Disclosure of Invention

Based on this, it is necessary to provide a rotational grinding device in which a problem of frequent replacement of the grinding head in the rotational grinding operation is avoided.

In one aspect, the present application provides a rotational atherectomy device comprising:

a grater including a proximal portion, a distal portion, and an intermediate portion disposed separately, the intermediate portion being disposed between the proximal portion and the distal portion; the method comprises the steps of,

the driving shaft penetrates through the grinding head, the proximal end portion and the distal end portion are fixedly connected with the driving shaft, a first through hole used for the driving shaft to penetrate through is formed in the middle portion, and the aperture of the first through hole is larger than the outer diameter of the driving shaft.

The technical scheme of the application is further described below:

in one embodiment, the first through hole is a waist-shaped hole, and the hole length of the waist-shaped hole is larger than the outer diameter of the driving shaft; the hole width of the waist-shaped hole is larger than or equal to the outer diameter of the driving shaft.

In one embodiment, the central axis of the drive shaft, the central axis of the distal portion, and the central axis of the proximal portion are disposed in line.

In one embodiment, the outer diameter of the distal portion increases gradually from the distal end toward the proximal end; the outer diameter of the proximal portion tapers from the distal end to the proximal end.

In one embodiment, the intermediate portion is cylindrical in shape; the outer surface of the distal end part is a first curved surface with the outer diameter gradually increasing from the distal end to the proximal end; the outer surface of the proximal portion is a second curved surface having an outer diameter that gradually decreases from the distal end toward the proximal end.

In one embodiment, the outer surface of the intermediate portion, the outer surface of the distal portion and the outer surface of the proximal portion are each provided with grinding particles for grinding.

In one embodiment, the rotational atherectomy device further includes an outer sheath that is sleeved over the abrasive tip and the drive shaft, and the outer sheath is axially movable relative to the abrasive tip and the drive shaft.

In one embodiment, the outer sheath tube comprises a thick diameter section, a variable diameter section and a thin diameter section which are sequentially connected, wherein the inner diameter of the thick diameter section is larger than or equal to the outer diameter of the middle part, and the thick diameter section is used for accommodating the distal end part and the middle part; the inner diameter of the small-diameter section is larger than or equal to the outer diameter of the driving shaft, and the small-diameter section is used for accommodating the driving shaft; the inner diameter of the reducing section gradually reduces from the inner diameter of the thick-diameter section to the inner diameter of the thin-diameter section, and the reducing section is used for accommodating the proximal end portion.

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

In one embodiment, the drive shaft includes a spring tube that extends through the grater for transmitting torque.

In one embodiment, the two end edges of the middle part are provided with first fillets; and/or the edges of the two ends of the distal end part are provided with second fillets; and/or the edges of the two ends of the proximal part are provided with third fillets.

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

According to the rotary grinding device, the proximal part, the distal part and the middle part are arranged, the aperture of the first through hole formed in the middle part is larger than the outer diameter of the driving shaft, so that after the grinding head reaches the target position, the middle part of the grinding head is affected by gravity, and the central axis of the middle part can deviate from the central axis of the driving shaft, namely, centroid deviation is generated. The distance that the centroid is offset is constrained by the vessel lumen size and increases as the vessel lumen radius increases. And the maximum value of the center of mass offset of the intermediate portion is limited by the size of the aperture of the first through hole. After the rotary grinding is started, the proximal end part and the distal end part are fixedly connected with the driving shaft, so that the driving shaft can drive the proximal end part and the distal end part to rotate around the axis of the driving shaft at a high speed, and the proximal end part and the distal end part are ground to remove lesions in blood vessels. Meanwhile, as the center of mass of the middle part is offset and the aperture of the first through hole formed in the middle part is larger than the outer diameter of the driving shaft, the driving shaft can rotate around the central axis of the middle part in the first through hole while rotating around the axis of the driving shaft, so that the proximal part and the distal part are driven to revolve around the central axis of the middle part along a circumferential orbit, and as the opening radius of a vascular lumen increases, the center of mass offset distance of the middle part increases, the revolution radius of the proximal part and the distal part increases, and the grinding radius of the proximal part and the distal part increases. Meanwhile, the middle part can rotate under the action of friction force with the driving shaft so as to grind lesions in the blood vessel, the grinding radius of the middle part is larger than the maximum outer diameter of the middle part due to the centroid deviation of the middle part, and the centroid deviation distance of the middle part is increased along with the increase of the opening radius of the lumen of the blood vessel, so that the grinding radius of the middle part is increased, namely the grinding radius of the rotary grinding device can be increased according to the increase of the diameter of the blood vessel, and the rotary grinding opening which can conform to the diameter of the blood vessel is realized.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a rotary grinding apparatus according to an embodiment;

FIG. 2 is a schematic view of the middle part of an embodiment;

FIG. 3 is a schematic view of the structure of the distal portion of an embodiment;

FIG. 4 is a schematic view of the structure of the proximal portion of an embodiment;

fig. 5 is a schematic structural view of an outer sheath according to an embodiment.

Reference numerals illustrate:

10. grinding head; 11. a proximal portion; 111. a third distal end face; 112. a second curved surface; 113. a third proximal face; 114. a second round hole; 115. a central axis of the proximal portion; 116. a third rounded corner; 12. an intermediate portion; 121. a first distal face; 122. a cylindrical surface; 123. a first proximal face; 124. a first through hole; 125. a central axis of the middle part; 126. a first rounded corner; 13. a distal end portion; 131. a second distal face; 132. a first curved surface; 133. a second proximal face; 134. a first round hole; 135. a central axis of the distal portion; 136. a second rounded corner; 20. a drive shaft; 21. a central axis of the drive shaft; 30. an outer sheath; 31. a thick diameter section; 32. a reducing section; 33. and (5) a small diameter section.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.

In the description of the present invention, "proximal" refers to the end of the component that is near the operator; "distal" refers to the end of the member that is distal from the near operator.

Referring to fig. 1 to 2, in particular, a rotational grinding apparatus of an embodiment includes a grinding head 10 and a driving shaft 20, wherein the grinding head 10 includes a proximal portion 11, a distal portion 13, and an intermediate portion 12 which are separately provided, and the intermediate portion 12 is provided between the proximal portion 11 and the distal portion 13. The driving shaft 20 is penetrated in the grinding head 10, the proximal end 11 and the distal end 13 are fixedly connected with the driving shaft 20, the middle part 12 is provided with a first through hole 124 for penetrating the driving shaft 20, and the aperture of the first through hole 124 is larger than the outer diameter of the driving shaft 20.

Specifically, the above-mentioned rotational grinding device is through making proximal end portion 11, distal end portion 13 and intermediate portion 12 components of a whole that can function independently set up, namely proximal end portion 11, distal end portion 13 and intermediate portion 12 do not have fixed connection, compare in traditional integral type bistrique 10, the split type bistrique 10 of this application has better compliance, thereby make rotational grinding device when passing through vascular tortuosity department, drive shaft 20 can bend between proximal end portion 11 and intermediate portion 12 and between distal end portion 13 and intermediate portion 12 of split type bistrique 10, avoid bistrique 10 to incarceration in vascular tortuosity department, guaranteed rotational grinding device can be smoothly through vascular tortuosity department, increased rotational grinding device's trafficability.

Meanwhile, since the diameter of the first through hole 124 formed in the middle portion 12 is larger than the outer diameter of the driving shaft 20, after the grinding head 10 reaches the target position, the middle portion 12 of the grinding head 10 is affected by gravity, and the central axis 125 of the middle portion deviates from the central axis 21 of the driving shaft, that is, a centroid deviation occurs. The distance that the centroid is offset is constrained by the vessel lumen size and increases as the vessel lumen radius increases. And the maximum value of the center of mass offset of the intermediate portion 12 is limited by the size of the aperture of the first through hole 124. After the rotational grinding is started, the proximal end 11 and the distal end 13 are fixedly connected with the driving shaft 20, so that the driving shaft 20 can drive the proximal end 11 and the distal end 13 to rotate at a high speed around the axis of the driving shaft, and the proximal end 11 and the distal end 13 can grind and remove lesions in blood vessels. Meanwhile, as the center of mass of the middle part 12 is offset and the aperture of the first through hole 124 formed in the middle part 12 is larger than the outer diameter of the driving shaft 20, the driving 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 the driving shaft, so that the proximal part 11 and the distal part 13 are driven to revolve around the central axis 125 of the middle part along a circumferential orbit, and as the opening radius of the vascular lumen increases, the center of mass offset distance of the middle part 12 increases, so that the revolution radius of the proximal part 11 and the distal part 13 around the central axis 125 of the middle part increases, and the grinding radius of the proximal part 11 and the distal part 13 increases. Meanwhile, the middle part 12 rotates under the action of friction force with the driving shaft 20 so as to grind lesions in blood vessels, and as the center of mass of the middle part 12 deviates, the grinding radius of the middle part 12 is larger than the maximum outer diameter of the middle part 12, and as the opening radius of a blood vessel lumen increases, the center of mass deviation distance of the middle part 12 increases, so that the grinding radius of the middle part 12 increases, namely, the grinding radius of a rotary grinding device can increase according to the increase of the blood vessel diameter, and rotary grinding opening which can conform to the blood vessel diameter is realized.

Referring to fig. 2, in the present embodiment, the overall shape of the intermediate portion 12 is a cylinder having a diameter of 1.5mm to 3mm and a length of 1mm 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, the distal end portion 13 and the proximal end portion 11 are in contact fit with the intermediate portion 12, so that the intermediate portion can be driven to rotate by friction force when the distal end portion 13 and the proximal end portion 11 rotate, and the grinding efficiency of the rotational grinding device is improved.

Specifically, referring to fig. 2, intermediate portion 12 includes oppositely disposed first distal end face 121, first proximal end face 123, and cylindrical surface 122 between first distal end face 121 and first proximal end face 123. The cylindrical surface 122 is used for grinding and removing lesions of blood vessels, and the middle part 12 is provided with a cylinder, so that the middle part 12 can be better matched with a tubular blood vessel inner cavity, and the grinding effect is improved. It will be appreciated that in other embodiments, the intermediate portion 12 may have other shapes.

Further, in the present 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 roughness of the surface of the cylindrical surface 122, thereby improving the grinding effect of the intermediate portion 12. Preferably, the grinding particles can be diamond particles, the hardness of the diamond particles is high, the stability is good, and lesions such as plaque in blood vessels can be effectively ground. Further, diamond particles may be coated on the cylindrical surface 122 by plating or adhesive bonding, etc.

Further, the edges at both ends of the middle portion 12, that is, the edge of the first distal end face 121 and the edge of the first proximal end face 123 are respectively chamfered with a first rounded corner 126, so that sharp edges and corners are avoided at the edge of the first distal end face 121 and the edge of the first proximal end face 123, and thus the risk of damaging blood vessels at both ends of the middle portion 12 is reduced, and the middle portion 12 is prevented from wearing the proximal end portion 11 and the distal end portion 13 during high-speed rotational grinding, preferably, the radius of the first rounded corner 126 is 0.05 mm-1 mm.

Further, with continued reference to fig. 2, the first through-hole 124 is a kidney-shaped hole having a hole length greater than the outer diameter of the drive shaft 20. The width of the waist-shaped hole is greater than or equal to the outer diameter of the drive shaft 20. The hole length of the waist-shaped hole refers to the dimension of the largest inner diameter of the waist-shaped hole, and the hole width of the waist-shaped hole refers to the dimension of the smallest inner diameter of the waist-shaped hole. Preferably, the waist-shaped holes have a hole length of 1mm-1.5mm and a hole width of 0.5mm-0.7mm.

By configuring the first through-hole 124 as a kidney-shaped hole, the center portion 12 is offset from the center axis 21 of the drive shaft in the hole length direction of the kidney-shaped hole, i.e., a center of mass offset, due to the influence of gravity when the grinding head 10 reaches the target position. The distance of the centroid offset is constrained by the vessel lumen size and increases as the vessel lumen radius increases, and the maximum value of the centroid offset of the middle portion 12 is half the hole length of the waist-shaped hole. The center of mass offset of the middle part 12 can enable the grinding radius of the middle part 12 when rotating to be larger than the maximum outer diameter of the middle part 12, and the center of mass offset distance of the middle part is increased along with the increase of the opening radius of the vascular lumen, so that the grinding radius of the middle part 12 is increased, namely the grinding radius of the rotary grinding device can be increased according to the increase of the vascular diameter, and the rotary grinding opening which can conform to the vascular diameter is realized. It should be noted that, in another embodiment, the first through hole 124 of the middle portion 12 may also be a circular hole, and the diameter of the circular hole is larger than the outer diameter of the driving shaft 20. This also produces a centroid offset effect in the intermediate portion 12, thereby achieving a rotational abrasion of the grinding head 10 to conform to the vessel diameter to open the vessel.

With continued reference to fig. 1-4, 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 arranged in line, that is, 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 coincide, so that when the drive shaft 20 rotates, the distal end 13 and the proximal end 11 can rotate around their central axes, and the distal end 13 and the proximal end 11 are smoother during grinding. It should be noted that, in another embodiment, the central axis 135 of the distal portion or the central axis 115 of the proximal portion may be offset with respect to the central axis 21 of the driving shaft, so that the rotational grinding function of the proximal portion 11 and the distal portion 13 is not affected.

Further, with continued reference to fig. 1, the outer diameter of the distal portion 13 gradually increases from the distal end toward the proximal end, avoiding that the outer diameter of the grater 10 is too large to enter the vascular stenosis, and improving the passability of the rotational atherectomy device. Further, the outer diameter of the proximal portion 11 is gradually reduced from the distal end to the proximal end, so that the grinding head 10 is prevented from being stuck by a vascular stenosis at the time of withdrawal, and the retractility of the rotational grinding device is improved.

Referring to fig. 3, the distal end portion 13 of the grater 10 is preferably, in this embodiment, generally a hemisphere having a radius of 0.5mm to 1.5 mm. Preferably, the diameter of the distal portion 13 is equal to the diameter of the intermediate portion 12, so that the transition of the grater 10 from the distal portion 13 to the intermediate portion 12 is smoother, further improving the passability of the grater 10. Specifically, the distal end portion 13 includes a second distal end face 131, a second proximal end face 133, and a first curved face 132 located between the second distal end face 131 and the second proximal end face 133, the outer diameter of the first curved face 132 gradually increasing from the distal end toward the proximal end. Preferably, the first curved surface 132 is a hemispherical surface. By providing the distal portion 13 in the shape of a hemisphere, the grater 10 is allowed to penetrate more smoothly into the stenosis of the vessel, thereby improving the passability of the grater 10, it being understood that in other embodiments the distal portion 13 may also be in the shape of a cone, which also increases the passability of the grater 10.

Further, in the present embodiment, the first curved surface 132 is used for grinding and removing lesions of blood vessels, specifically, the outer surface of the distal end portion 13, that is, 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, the hardness of the diamond particles is high, the stability is good, and lesions such as plaque in blood vessels can be effectively ground. Further, the diamond particles may be coated on the first curved surface 132 by plating or adhesive bonding, etc.

Further, the edges of the two ends of the distal end portion 13, that is, the edge of the second distal end face 131 and the edge of the second proximal end face 133 are each rounded with a second rounded corner 136, so as to avoid sharp edges of the edge of the second distal end face 131 and the edge of the second proximal end face 133, thereby reducing the risk of damaging the blood vessel by the edges of the two ends of the distal end portion 13, and preferably, the radius of the second rounded corner 136 is 0.05mm to 1mm.

Further, the distal end portion 13 is provided with a first circular hole 134 for the penetration of the driving shaft 20, and the center line of the first circular hole 134 coincides with the center line 135 of the distal end portion. Preferably, the aperture of the first circular hole 134 is 0.5mm to 0.7mm, and preferably, the aperture of the first circular hole 134 is equal to the outer diameter of the driving shaft 20. The drive shaft 20 is fixed in the first circular hole 134 by welding or bonding, etc. It should be noted that, in other embodiments, the distal end of the driving shaft 20 may be directly fixed to the second proximal end face 133 of the distal end portion 13 by welding or bonding, so as to omit the first through hole 124.

Referring to fig. 4, the proximal portion 11 has the same shape as the distal portion 13, is hemispherical, and the proximal portion 11 and the distal portion 13 are symmetrical about the intermediate portion 12. Specifically, the proximal portion 11 includes a third distal end face 111, a third proximal end face 113, and a second curved face 112 located between the third distal end face 111 and the third proximal end face 113, the outer diameter of the second curved face 112 gradually decreasing from the distal end toward the proximal end. Preferably, the second curved surface 112 is a hemispherical surface. By providing the distal portion 13 in the shape of a hemisphere, the grater 10 can be made to more smoothly exit the stenosis of the vessel upon exiting, thereby improving the pullback of the grater 10, it being understood that in other embodiments the distal portion 13 may also be in the shape of a cone, which also increases the passability of the grater 10. Further, in the present embodiment, the second curved surface 112 is used for grinding and removing lesions of blood vessels, and specifically, the outer surface of the proximal portion 11, that is, the second curved surface 112 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 may be diamond particles, and further, the diamond particles may be coated on the second curved surface 112 by electroplating or bonding with an adhesive.

Further, the edges of the two ends of the proximal portion 11, that is, the edge of the third distal end face 111 and the edge of the third proximal end face 113 are each rounded with a third rounded corner 116, so as to avoid sharp corners of the edge of the third distal end face 111 and the edge of the third proximal end face 113, and thus reduce the risk of damaging the blood vessel by the edges of the two ends of the proximal portion 11, and preferably, the radius of the second rounded corner 136 is 0.05mm to 1mm.

Further, the proximal portion 11 is provided with a second circular hole 114 for the penetration of the driving shaft 20, and the center line of the second circular hole 114 coincides with the center line 115 of the proximal portion. Preferably, the aperture of the second circular hole 114 is 0.5mm to 0.7mm, and preferably, the aperture of the second circular hole 114 is equal to the outer diameter of the driving shaft 20. The drive shaft 20 is fixed in the second circular hole 114 by welding or bonding, etc.

Referring to fig. 1 and 5, the rotational atherectomy device further includes an outer sheath 30, wherein the outer sheath 30 is sleeved on the abrasive tip 10 and the driving shaft 20, and the outer sheath 30 is capable of moving axially relative to the abrasive tip 10 and the driving shaft 20. The outer sheath 30 is used for accommodating the grinding head 10, so that the grinding head 10 is prevented from scratching the normal vessel wall before the grinding head 10 is conveyed to the vascular lesion position, the outer sheath 30 is retracted after the grinding head 10 is conveyed to the vascular lesion position, the outer sheath 30 is exposed out of the grinding head 10, and the grinding head 10 is driven to rotate by the driving shaft 20, so that the vascular lesion position can be ground.

Specifically, the outer sheath 30 includes a large diameter section 31, a variable diameter section 32 and a small diameter section 33 connected in this order, and the inner diameter of the large diameter section 31 is greater than or equal to the outer diameter of the intermediate portion 12, preferably the inner diameter of the large diameter section 31 is 1.5mm to 3mm. The large diameter section 31 is for receiving the distal end portion 13 and the intermediate portion 12 of the grinding head 10. The inner diameter of the small diameter section 33 is greater than or equal to the outer diameter of the drive shaft 20, preferably the outer diameter of the small diameter section 33 is 4f (1.32 mm), and the small diameter section 33 is used for accommodating the drive shaft 20. The inner diameter of the variable diameter section 32 gradually decreases from the inner diameter of the large diameter section 31 to the inner diameter of the small diameter section 33. Preferably, the reducing section 32 is hemispherical, and the reducing section 32 is configured to receive the proximal portion 11.

Preferably, the inner diameter of the large diameter section 31 is equal to the outer diameter of the middle section 12, the inner diameter of the variable diameter section 32 is equal to the outer diameter of the proximal section, and the inner diameter of the small diameter section 33 is equal to the outer diameter of the driving shaft 20, so that when the outer sheath 30 accommodates the grinding head 10 and the driving shaft 20, the coaxiality of the grinding head 10 and the driving shaft 20 is ensured, and the pushing resistance is further reduced. Preferably, the wall thickness of the thick diameter section 31, the wall thickness of the variable diameter section 32, and the wall thickness of the thin diameter section 33 are the same.

Preferably, the outer sheath 30 may be a polymer tube or a multi-layer woven tube, and the outer circumferential surface of the outer sheath 30 is provided with a lubricating coating, which may be a hydrophilic coating, so as to reduce friction force suffered by the outer sheath 30 in the revascularization, enable the outer sheath 30 to pass through the blood vessel more smoothly, and ensure the trafficability of the outer sheath 30.

Referring to fig. 1, in the present embodiment, the driving shaft 20 is a flexible driving shaft, and specifically, the driving shaft 20 includes a spring tube penetrating through the grinding head 10 for transmitting torque. Understandably, the spring tube has certain elastic deformation capability, can bend along the bending of a blood vessel, and is combined with the split grinding head 10, so that when the rotary grinding device passes through the vascular tortuosity, the driving shaft 20 can bend between the proximal part 11 and the middle part 12 and between the distal part 13 and the middle part 12 of the split grinding head 10, the grinding head 10 is prevented from being embedded in the vascular tortuosity, the rotary grinding device is ensured to pass through the vascular tortuosity smoothly, and the trafficability of the rotary grinding device is increased. Preferably, the spring tube is wound from single or multi-strand stainless steel wire.

Further, the contact surface between the intermediate portion 12 and the proximal portion 11 is provided with a first friction structure, i.e. the first proximal end surface 123 of the intermediate portion 12 and the third distal end surface 111 of the proximal portion 11 are provided with a first friction structure. Specifically, the first friction structure may be a plurality of bumps or a plurality of grooves that can increase the surface roughness of the first proximal face 123 and the third distal face 111. Or the first friction structure may also be a coating, such as a silicone coating or a rubber coating, that increases the coefficient of friction of the first proximal face 123 and the third distal face 111. By providing the first friction structure at the contact surface between the intermediate portion 12 and the proximal portion 11, the friction force between the intermediate portion 12 and the proximal portion 11 is increased, so that the proximal portion 11 can drive the intermediate portion 12 to rotate when rotating, and the grinding efficiency of the grinding head 10 is improved.

Further, the contact surface between the intermediate portion 12 and the distal portion 13 is provided with a second friction structure, i.e. the first distal surface 121 of the intermediate portion 12 and the second proximal surface 133 of the distal portion 13 are both provided with a second friction structure. In particular, the second friction structure may be a plurality of bumps or a plurality of grooves that can increase the surface roughness of the first distal end surface 121 and the second proximal end surface 133. Or the second friction structure may be a coating, such as a silicone coating or a rubber coating, that increases the coefficient of friction of the first distal end face 121 and the second proximal end face 133. By providing the second friction structure at the contact surface between the middle portion 12 and the distal end portion 13, the friction force between the middle portion 12 and the distal end portion 13 is increased, so that the distal end portion 13 can drive the middle portion 12 to rotate when rotating, and the grinding efficiency of the grinding head 10 is improved.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

In the description of the present 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", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Claims

1. A rotational atherectomy device, comprising:

2. The rotational atherectomy device of claim 1, wherein the first throughbore is a kidney-shaped bore having a bore length greater than an outer diameter of the drive shaft; the hole width of the waist-shaped hole is larger than or equal to the outer diameter of the driving shaft.

3. The rotational atherectomy device of claim 1, wherein the central axis of the drive shaft, the central axis of the distal section, and the central axis of the proximal section are disposed in-line.

4. The rotational atherectomy device of claim 1, wherein the outer diameter of the distal section increases gradually from the distal end to the proximal end; the outer diameter of the proximal portion tapers from the distal end to the proximal end.

5. The rotational atherectomy device of claim 4, wherein the rotational atherectomy device comprises; the middle part is cylindrical; the outer surface of the distal end part is a first curved surface with the outer diameter gradually increasing from the distal end to the proximal end; the outer surface of the proximal portion is a second curved surface having an outer diameter that gradually decreases from the distal end toward the proximal end.

6. The rotational atherectomy device of claim 5, wherein the outer surface of the intermediate section, the outer surface of the distal section and the outer surface of the proximal section are each provided with abrasive particles for grinding.

7. The rotational atherectomy device of claim 1, further comprising an outer sheath tube, the outer sheath tube being disposed over the abrasive tip and the drive shaft, and the outer sheath tube being axially moveable relative to the abrasive tip and the drive shaft.

8. The rotational atherectomy device of claim 7, wherein the sheath comprises a large diameter section, a variable diameter section and a small diameter section connected in sequence, the large diameter section having an inner diameter greater than or equal to the outer diameter of the intermediate section, the large diameter section being adapted to receive the distal section and the intermediate section; the inner diameter of the small-diameter section is larger than or equal to the outer diameter of the driving shaft, and the small-diameter section is used for accommodating the driving shaft; the inner diameter of the reducing section gradually reduces from the inner diameter of the thick-diameter section to the inner diameter of the thin-diameter section, and the reducing section is used for accommodating the proximal end portion.

9. The rotational atherectomy device of claim 7, wherein the outer peripheral surface of the outer sheath is provided with a lubricious coating.

10. The rotational atherectomy device of claim 1, wherein the drive shaft comprises a spring tube that is threaded through the abrasive tip, the spring tube being configured to transmit torque.

11. The rotational atherectomy device of claim 1, wherein the intermediate section has first rounded corners at both edges; and/or the edges of the two ends of the distal end part are provided with second fillets; and/or the edges of the two ends of the proximal part are provided with third fillets.

12. The rotational atherectomy device of claim 1, wherein the interface between the intermediate section and the proximal section is provided with a first friction structure; and/or the contact surface between the middle part and the distal part is provided with a second friction structure.