Cutting assembly and rotary cutting equipment

Abstract

The invention relates to a cutting assembly and rotary cutting equipment, and the cutting assembly comprises a main cutter head which is provided with a first flow channel groove extending in the axial direction of the main cutter head; the auxiliary tool bit is provided with a second flow channel groove extending in the axial direction of the auxiliary tool bit, the first flow channel groove and the second flow channel groove are aligned to form a conveying groove, the auxiliary tool bit comprises a main body part and a connecting part connected with the main body part, the connecting part is connected with the main tool bit so that the auxiliary tool bit and the main tool bit can synchronously rotate, and an assembly gap is formed between the main body part and the main tool bit; the protection ring is arranged at the near end of the main tool bit and the far end of the main body part in a sleeving manner; and the cutting piece is arranged in the assembling gap and connected with the protection ring, so that the cutting piece cannot synchronously rotate along with the main tool bit, and the cutting piece is used for being matched with the near end face of the main tool bit and / or the far end face of the auxiliary tool bit so as to shear unexpected substances passing through the conveying groove. The cutting assembly arranged in this way can conduct secondary cutting and smashing on the plaque, so that the plaque in the conveying groove is finer, the plaque conveying speed is increased, and the operation duration is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a cutting assembly and a rotational cutting device. Background Art

[0002] What is provided in this part is only background information related to the present disclosure, and it is not necessarily prior art.

[0003] Atherosclerosis refers to a disease in which lipid patchy deposits (atheromatous plaques or atherosclerotic plaques) form on the arterial wall of medium or large arteries, resulting in a reduction in blood flow or obstruction of blood outflow.

[0004] Currently, rotational atherectomy is a treatment method for atherosclerosis and involves using a rotational cutting device to mechanically remove plaques from the arterial wall. The rotational cutting device can allow plaques to be removed from the arterial wall, reducing the risk of stretching, cutting, or dissecting the arterial wall and causing tissue damage leading to restenosis. In some cases, rotational atherectomy can be used to treat restenosis by removing scar tissue.

[0005] Existing rotational cutting devices generally include an operating handle, a catheter assembly, and a cutting assembly. Among them, the catheter assembly connects the operating handle and the cutting assembly. The cutting assembly includes a main cutter head and an auxiliary cutter head, and both the main cutter head and the auxiliary cutter head have flow channel grooves. Generally, the plaques cut from large plaques by the cutting assembly will form strips, fibers, or blocks, and the cut plaques enter the catheter assembly through the flow channel grooves.

[0006] Usually, to ensure the smooth passage of the cut plaques through the flow channel grooves, the flow channel grooves of the main cutter head and the auxiliary cutter head are aligned and assembled. However, since the space in the catheter assembly for transporting the cut plaques is small, if the strip-shaped, fibrous, or block-shaped small plaques formed by cutting through the cutting assembly cannot be further cut and crushed and directly enter the catheter assembly, it is very likely to cause blockage of the transport channel in the catheter assembly. To achieve further cutting and crushing of the plaques, the flow channel grooves of the main cutter head and the auxiliary cutter head are misaligned and assembled, so that the shearing force between the main cutter head and the auxiliary cutter head re-cuts and crushes the cut plaques entering the flow channel grooves. However, with such a setting, it will hinder the entry of the cut plaques into the catheter assembly.

[0007] Therefore, there is an urgent need for a cutting assembly that can both ensure the transport capacity of the cut plaques and cut and crush the cut plaques. Summary of the Invention

[0008] Based on this, it is necessary to provide a cutting assembly that can perform secondary cutting and crushing and has strong transport capacity.

[0009] Furthermore, a rotational cutting device that can perform secondary cutting and crushing and has strong transport capacity is also provided.

[0010] A cutting assembly, comprising: a main cutter head having a first flow channel groove extending along its axial direction; an attached cutter head having a second flow channel groove extending along its axial direction, and the first flow channel groove is aligned with the second flow channel groove to form a transport groove. The attached cutter head includes a main body portion and a connecting portion connected to the main body portion, the connecting portion is connected to the main cutter head, so that the attached cutter head and the main cutter head can rotate synchronously, and there is an assembly gap between the main body portion and the main cutter head; a protective ring sleeved on the proximal end of the main cutter head and the distal end of the main body portion; a cutting member disposed in the assembly gap and connected to the protective ring, so that the cutting member cannot rotate synchronously with the main cutter head, and the cutting member is used to cooperate with the proximal end face of the main cutter head and / or the distal end face of the attached cutter head to shear undesired substances passing through the transport groove.

[0011] In one embodiment, the cutting member includes: a socket portion sleeved on the connecting portion and not fixedly connected to the connecting portion; and a cutting portion, one end of which is connected to the socket portion, and the other end extends radially and is connected to the protective ring. The cutting portion is used to cut undesired substances entering the second flow channel groove through the first flow channel groove.

[0012] In one embodiment, the circumferential width of the cutting portion is less than the width of the transport groove, and the circumferential width range of the cutting portion is 0.2 - 1.0 mm.

[0013] In one embodiment, a plurality of the cutting portions are provided, and the plurality of cutting portions are circumferentially spaced apart along the socket portion, and first cutting edges are provided on all of the plurality of cutting portions.

[0014] In one embodiment, the main cutter head includes: a first rotary cutting portion and a second rotary cutting portion connected to the proximal end of the first rotary cutting portion. A plurality of first cutting edges are formed on the first rotary cutting portion, the first flow channel groove is located between adjacent first cutting edges, and the first flow channel groove extends from the first rotary cutting portion to the second rotary cutting portion.

[0015] In one embodiment, a second cutting edge is formed on the proximal edge of the second rotary cutting portion, and the extension line of the second cutting edge intersects with the extension line of the first cutting edge.

[0016] In one embodiment, the cutting assembly further includes a protective cover sleeved on the first rotary cutting portion and fixedly connected to the protective ring. The protective cover is a hollow structure, and a second cutting edge is provided on the protective cover. The second cutting edge cooperates with the first cutting edge to cut undesired substances.

[0017] In one embodiment, the protective cover includes: a first annular member fixedly connected to the distal end of the protective ring; a second annular member disposed on the distal side of the first annular member, the second annular member sleeved on the connecting portion and not fixedly connected to the connecting portion; and a connecting member having one end connected to the first annular member and the other end connected to the second annular member to form a hollow structure; the second cutting edge is disposed on the side edge of the connecting member.

[0018] In one embodiment, the main body portion includes: a third rotary cutting portion and a fourth rotary cutting portion connected to the proximal end of the third rotary cutting portion. A plurality of third cutting edges are formed on the third rotary cutting portion. The second flow channel groove is located between adjacent third cutting edges, and the second flow channel groove extends from the third rotary cutting portion to the fourth rotary cutting portion.

[0019] In one embodiment, a fourth cutting edge is formed on the distal edge of the third rotary cutting portion, and the extension line of the fourth cutting edge intersects with the extension line of the third cutting edge.

[0020] In one embodiment, the protective ring includes: an inner ring and an outer ring; the outer ring is sleeved on the inner ring, the inner side wall of the inner ring is connected to the cutting member, the distal end of the inner ring protrudes from the distal end face of the outer ring to form a first stepped portion, the radial dimension of the first rotary cutting portion is larger than the radial dimension of the second rotary cutting portion, and a first stepped surface is formed at the junction of the first rotary cutting portion and the second rotary cutting portion. The first stepped surface abuts against the distal end face of the first stepped portion, and the protective cover is sleeved on the first stepped portion, and the proximal end face of the protective cover abuts against the distal end face of the outer ring.

[0021] In one embodiment, the protective ring includes: an inner ring and an outer ring; the outer ring is sleeved on the inner ring, the inner side wall of the inner ring is connected to the cutting member, and a second stepped surface is formed at the junction of the proximal end of the inner ring and the inner side wall of the outer ring. The distal end of the third rotary cutting portion abuts against the second stepped surface.

[0022] A rotary cutting device includes: a control handle in which a power device is disposed; a catheter assembly having a proximal end connected to the control handle; a torque shaft passing through the catheter assembly, the proximal end of the torque shaft penetrating into the control handle and connected to the power device; and a cutting assembly as described above, the proximal end of the protective ring being connected to the distal end of the catheter assembly; the proximal end of the main body portion being connected to the distal end of the torque shaft and capable of rotating synchronously with the torque shaft.

[0023] The cutting assembly provided by the embodiment of the present invention includes a main blade head, an auxiliary blade head, a cutting piece and a protective ring. The main blade head and the auxiliary blade head can rotate synchronously for cutting and transportation, so that the cut unwanted substances (such as plaques) are transported to the outside through the transport groove formed by the alignment of the first flow channel groove and the second flow channel groove, which can effectively improve the transportation rate of the cutting assembly, so that the cut plaque can pass through the transport groove smoothly; at the same time, the cutting piece is connected to the protective ring, and the protective ring can support the cutting piece so that the cutting piece does not rotate synchronously with the main blade head, so that the cutting piece can cooperate with the proximal end face of the main blade head and / or the distal end face of the auxiliary blade head to perform secondary cutting and crushing on the plaque entering the transport groove, thereby making the plaque in the transport groove more finely broken, which is conducive to further improving the transport rate of the plaque, reducing the risk of blockage and jamming of the cutting assembly, thereby improving the safety of clinical use and shortening the duration of the excision operation.

[0024] The rotary excision device provided in the embodiment of the present invention uses a cutting component that can cut and crush plaques for a second time and has a strong conveying ability, so that the plaques entering the catheter component are more broken up, which is more conducive to the catheter component to transport the broken plaques out of the body, improves the conveying rate of the catheter component, reduces the risk of clogging of the catheter component, and thus improves the safety of clinical use and shortens the duration of the rotary excision operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] in:

[0027] Figure 1 It is a schematic diagram of the overall structure of the rotary cutting device in one embodiment of the present invention.

[0028] Figure 2 It is a schematic diagram of the structure of the rotary cutting device after the control handle is opened in one embodiment of the present invention.

[0029] Figure 3 It is a schematic diagram of the structures of the cutting assembly, the catheter assembly and the torque shaft in one embodiment of the present invention.

[0030] Figure 4 For along Figure 3 Schematic diagram of the structure after cutting along the center cutting line AA.

[0031] Figure 5 Schematic diagram of the structure of a cutting assembly in one embodiment of the present invention.

[0032] Figure 6Schematic diagram of the structure of the main cutting head, auxiliary cutting head and cutting element in one embodiment of the present invention.

[0033] Figure 7 FIG. 4 is an exploded view of a cutting assembly in one embodiment of the present invention.

[0034] Figure 8 Schematic diagram of the structure of the main cutting head in one embodiment of the present invention.

[0035] Figure 9 Schematic diagram of the structure of a cutting member in one embodiment of the present invention.

[0036] Figure 10 It is a schematic diagram of the structure of the protective cover, the protective ring and the attached blade head in one embodiment of the present invention.

[0037] Figure 11 Schematic diagram of the structure of the blade head and the outer sleeve in one embodiment of the present invention.

[0038] Figure 12 Schematic diagram of the structure of a coupling component in one embodiment of the present invention.

[0039] Figure 13 For along Figure 12 Schematic diagram of the structure after cutting along the center cutting line BB. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] In the description of the embodiments of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0042] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a replaceable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium; it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0043] In the field of interventional medical devices, generally, the end of a medical device implanted into the human body or animal body that is closer to the operator is called the "proximal end", and the end that is farther from the operator is called the "distal end", and the "proximal end" and "distal end" of any component of the medical device are defined based on this principle. The "axial direction" generally refers to the length direction of the medical device when it is being delivered, and the "radial direction" generally refers to the direction of the medical device that is not parallel to its "axial direction", and the "axial direction" and "radial direction" of any component of the medical device are defined based on this principle. The "circumferential direction" refers to the circumferential direction, that is, the direction around the axis of the lumen structure or cylinder.

[0044] Please refer to Figures 1 to 3 , the embodiments of the present invention relate to a rotational cutting device 100, which is mainly used for rotational cutting of undesired substances (such as plaques, thrombi, etc.) formed on the blood vessel wall. It should be noted that, hereinafter, the example where the undesired substance is a plaque will be used for illustration.

[0045] In one embodiment, the rotational cutting device 100 includes: a control handle 1, a torque shaft 2, a catheter assembly 3, and a cutting assembly 4.

[0046] Specifically, a power device 11 is arranged inside the control handle 1. The torque shaft 2 passes through the catheter assembly 3. The proximal end of the torque shaft 2 penetrates into the control handle 1 and is connected to the power device 11. The distal end of the torque shaft 2 is connected to the cutting assembly 4. The torque shaft 2 is used to transmit the torque output by the power device 11 to the cutting assembly 4. The proximal end of the catheter assembly 3 is connected to the control handle 1. The cutting assembly 4 is arranged on the distal side of the catheter assembly 3, and a part of it is connected to the distal end of the catheter assembly 3, and the other part is connected to the distal end of the torque shaft 2. The cutting assembly 4 is used to cut the plaque formed on the blood vessel wall.

[0047] Please continue to refer to Figures 1 to 3 , in one of the embodiments, the control handle 1 includes: a housing 12, a transmission gear set 13, a coupling component 14, a power supply 15, and a control switch 16.

[0048] Among them, a power device 11, a transmission gear set 13, a coupling component 14, a power supply 15, and a mounting position for a control switch 16 (not shown in the attached drawings) are provided inside the housing 12. The transmission gear set 13 is installed on the proximal side inside the housing 12 and is connected to the power output shaft of the power device 11. The coupling component 14 is also installed on the proximal side inside the housing 12 and is sleeved on the torque shaft 2. The coupling component 14 is connected to the transmission gear set 13, thereby transmitting the torque output by the power device 11 to the torque shaft 2. The power supply 15 is installed inside the housing 12 and is located on the distal side of the power device 11. The power supply 15 is electrically connected to the power device 11 to supply power to the power device 11. The control switch 16 is installed on the housing 12 and is electrically connected to the power device 11 and the power supply 14 to control the on and off of the power device 11.

[0049] It should be noted that, in this embodiment, the housing 12 includes an upper housing and a lower housing. The power device 11, the transmission gear set 13, the coupling component 14, the power supply 15, and the control switch 16 are all fixedly assembled inside the housing 12 by the cooperation of the upper housing and the lower housing. A groove 121 and an anti-slip rib 122 are provided on the outer side wall of the housing 12. The groove 121 is located on the lower side wall of the housing 120, and the anti-slip rib 122 is located on the upper side wall of the housing 120. The settings of the groove 121 and the anti-slip rib 122 are beneficial to holding the control handle 1, and thus facilitate the operation of the rotary cutting device 100. In addition, a bending adjustment structure 5 is also provided on the housing for bending adjustment of the catheter assembly 3.

[0050] Please refer to Figures 2 to 4 , in one embodiment, the catheter assembly 3 includes an outer sleeve 31 and a sheath 32. The proximal end of the sheath 32 extends into the housing 12 and is connected to the proximal end of the coupling component 14. The proximal end of the outer sleeve 31 is connected to the distal end of the sheath 32, and the distal end of the outer sleeve 31 is connected to the cutting assembly 4.

[0051] In one embodiment, the outer sleeve 31 includes: a connection section 311, a transition section 312, and a flared section 313. The connection section 311 is located on the proximal side and is fixedly sleeved with the sheath 32. The connection section 311 is used for fixedly connecting with the sheath 32. The flared section 313 is located on the distal side and is connected to the cutting assembly 4. The proximal part of the cutting assembly 4 is installed in the inner cavity of the flared section 313. The proximal end of the transition section 312 is connected to the connection section 311, and the distal end is connected to the flared section 313. The transition section 312 is a variable-diameter tubular member with a gradually decreasing radial dimension from the distal end to the proximal end.

[0052] It should be noted that a delivery cavity 33 is formed between the outer wall of the sheath tube 32 and the torque shaft 2. The plaque cut by the cutting assembly 4 is discharged to the outside of the body through the delivery cavity 33. In this embodiment, the connecting section 311 is inserted into the lumen of the sheath tube 32 and is connected to the sheath tube 32 by hot melt fixation. In other embodiments, the connecting section 311 is sleeved on the distal end of the sheath tube 32 and is connected by hot melt fixation.

[0053] In one embodiment, a distal joint 141 is provided at the proximal end of the coupling member 14. The distal joint 141 includes an axially extending section 1411 and a branch section 1412. The axially extending section 1411 has an axially penetrating inner cavity. The distal end of the axially extending section 1411 is hermetically connected to the proximal end of the sheath tube 32, and the inner cavity communicates with the delivery cavity 33. One end of the branch section 1412 is connected to the axially extending section 1411, and the other end extends to the outside of the housing 12 and is held by the housing 12. A branch channel is provided on the branch section 1412, and the branch channel communicates with the inner cavity of the axially extending section 1411. The branch channel is used for discharging waste liquid and shredded plaque. The other end of the branch section 1411 extends out of the housing 12 to the outside and is held by the housing 12, which is beneficial to the more reliable connection of the distal joint 141 to the housing 12, so that the coupling member 14 is more reliably fixed inside the housing 12.

[0054] In one embodiment, a reduced-diameter section 3131 is provided at the distal end of the flared section 313. The outer diameter of the reduced-diameter section 3131 is smaller than the outer diameter of the flared section 313, but the inner diameter of the reduced-diameter section 3131 is the same as the inner diameter of the flared section 313. The reduced-diameter section 3131 is used for inserting the proximal end of the protective ring 44, so as to facilitate the welding of the flared section 313 and the protective ring 44.

[0055] Please return to Figure 3 and Figure 4 , in one of the embodiments, a winding spring 21 is fixedly installed on the outer wall of the torque shaft 2. When the torque shaft 2 drives the cutting assembly 4 to cut the plaque, the cut plaque enters the delivery cavity 33 through the transport groove 400, and through the rotation of the winding spring 21, the shredded plaque is spirally conveyed to the proximal side of the delivery cavity 33.

[0056] Please refer to Figures 5 to 7 , in one embodiment, the cutting assembly 4 includes: a main cutter head 41, an auxiliary cutter head 42, a cutting member 43, and a protective ring 44.

[0057] Specifically, the main cutting head 41 is located on the distal side of the auxiliary cutting head 42 and is connected to the auxiliary cutting head 42. The auxiliary cutting head 42 includes a main body portion 421 and a connecting portion 422 connected to the distal end of the main body portion 421. The connecting portion 422 is connected to the main cutting head 41, enabling the auxiliary cutting head 42 and the main cutting head 41 to rotate synchronously, and there is an assembly gap D1 between the main body portion 421 and the main cutting head 41. The main cutting head 41 has a first flow channel groove 410 extending axially, and the auxiliary cutting head 42 has a second flow channel groove 420 extending axially. The first flow channel groove 410 and the second flow channel groove 420 are aligned to form a transport groove 400. One end of the protective ring 44 is sleeved on the proximal portion of the main cutting head 41, and the other end is sleeved on the distal portion of the main body portion 422. The cutting member 43 is located within the assembly gap D1 and is connected to the protective ring 44, so that the cutting member 43 cannot rotate synchronously with the main cutting head 41. The cutting member 43 is used to cooperate with the proximal end face of the main cutting head 410 and / or the distal end face of the auxiliary cutting head 42 to shear the plaque passing through the transport groove 400.

[0058] It should be noted that the main cutting head 41 is fixedly welded to the distal end of the connecting portion 422, and the main body portion 421 is also fixedly welded to the distal end of the torque shaft 2. Therefore, the torque shaft 2, the main cutting head 41, and the auxiliary cutting head 42 can rotate synchronously. In addition, both the first flow channel groove 410 and the second flow channel groove 420 extend spirally along the axis of the main cutting head 410 or the auxiliary cutting head 420, and the spiral extension directions of the first flow channel groove 410 and the second flow channel groove 420 are the same. With such a setting, when the torque shaft 2 drives the main cutting head 41 and the auxiliary cutting head 42 to rotate and cut the plaque, the transport groove 400 can generate a component force that advances proximally along the axis direction through the inner wall, which is beneficial to moving the plaque cut into the transport groove 400 into the conveying cavity 33.

[0059] It should also be noted that the alignment of the first flow channel groove 410 and the second flow channel groove 420 to form the transport groove 400 can effectively improve the transport rate of the cutting assembly 4, enabling the cut plaque to pass through the transport groove 400 smoothly and unobstructedly. At the same time, by the cooperation of the cutting member 43 with the proximal end face of the first flow channel groove 410 and / or the distal end face of the second flow channel groove 420, the plaque entering the transport groove 400 is cut and crushed a second time, making the plaque in the transport groove 400 finer, which is beneficial to further improving the transport rate of the plaque and reducing the risk of blockage and jamming of the cutting assembly 4, thereby improving the safety of clinical use and shortening the duration of the rotational ablation surgery.

[0060] Please refer to Figures 5 to 8 , in one embodiment, the connecting portion 422 is a cylindrical connecting rod and has a free end. The proximal end of the connecting portion 422 is connected to the distal end of the main body portion 421. The free end of the connecting portion 422 extends distally along its axis. The main cutting head 41 has an axially penetrating mounting hole 411, and the connecting portion 422 passes through the mounting hole 411 and is fixedly connected to the main cutting head 41.

[0061] It should be noted that the connecting portion 422 passes through the mounting hole 411, and the distal end side is fixedly connected to the main cutter head 41 by welding. A welding notch 412 is provided on the distal end side of the main cutter head 41 to facilitate the welding of the connecting portion 422 to the main cutter head 41.

[0062] Please continue to refer to Figures 5 to 8 , in one embodiment, the main cutter head 41 includes: a first rotary cutting portion 413 and a second rotary cutting portion 414 connected to the proximal end of the first rotary cutting portion 413. A plurality of first cutting edges 4131 are formed on the first rotary cutting portion 413, and the first cutting edges 4131 are used for cutting plaques. It can be understood that the first flow channel groove 410 is located between adjacent first cutting edges 4131.

[0063] In one embodiment, a second cutting edge 4141 is formed on the proximal edge of the second rotary cutting portion 414. When the main cutter head 41 and the auxiliary cutter head 42 rotate, the first cutting edges 4131 cut the plaque to be removed. At the same time, the second cutting edge 4141 cooperates with the cutting member 43 to perform secondary cutting on the plaque entering the second flow channel groove 420 from the first flow channel groove 410, making the plaque transported to the transport cavity 33 by the transport groove 400 finer and more conducive to improving the transport rate.

[0064] In one embodiment, the radial dimension of the first rotary cutting portion 413 is greater than the radial dimension of the second rotary cutting portion 414. The radial dimension of the second rotary cutting portion 414 is smaller than the inner diameter of the distal end side of the protective ring 44, so that the second rotary cutting portion 414 can be inserted into the protective ring 44 to make the connection between the main cutter head 41 and the protective ring 44 more reliable. In addition, a first stepped surface 415 is formed at the junction of the first rotary cutting portion 413 and the second rotary cutting portion 414, and the distal end face of the protective ring 44 abuts against the first stepped surface 415 to provide an axial supporting force for the main cutter head 41, making it easier for the main cutter head 41 to abut against the plaque to be cut and then embed into the plaque to be cut, which is beneficial to plaque removal.

[0065] Please refer to Figure 6 、 Figure 7 and Figure 9 , in one embodiment, the cutting member 43 includes a socket portion 431 and a cutting portion 432. The socket portion 431 is sleeved on the connecting portion 422. Specifically, a socket hole 433 is provided on the socket portion 431, and the connecting portion 422 passes through the socket hole 433 and there is a gap between the connecting portion 422 and the inner wall of the socket hole 433 to facilitate the relative rotation of the main cutter head 41 and the auxiliary cutter head 42 with respect to the cutting member 43. One end of the cutting portion 432 is connected to the socket portion 431, and the other end is connected to the inner wall of the protective ring 44. The cutting portion 432 is used for secondary cutting of the plaque entering the second flow channel groove 420 through the first flow channel groove 410, so that the plaque transported to the transport cavity 33 by the transport groove 400 (refer to Figure 4) The patches are more fragmented, which is beneficial to improving the transportation rate of the cut patches, reducing the risk of jamming and blockage of the cutting component 4, and effectively avoiding the blockage of the conveying cavity 33.

[0066] It should be noted that the cutting part 432 and the protective ring 44 are fixed by laser welding. In this embodiment, between the cutting part 432 and the inner wall of the protective ring 44, through the laser welding technology, the side wall of the protective ring 44 is directly penetrated to realize the welding between the cutting part 432 and the inner wall of the protective ring 44. This welding technology is an existing technology and will not be elaborated here. In other embodiments, a welding groove for accommodating the cutting part 432 is provided on the protective ring 44, and the welding between the welding groove and the cutting part 432 is realized by laser welding technology.

[0067] In one embodiment, a plurality of cutting parts 432 are provided, and the plurality of cutting parts 432 are circumferentially spaced along the socket part 431, so that a gap is formed between adjacent cutting parts 432, reducing the obstruction to the second flow channel groove 420. Moreover, one end of each cutting part 432 is connected to the socket part 431, and the other end extends radially from the end connected to the socket part 431. A first cutting edge 4321 is provided on each cutting part 432. It should be noted that the first cutting edge 4321 is a sharp edge formed by grinding the side surface of the cutting part 432, which is beneficial to the secondary cutting of the patches. The number of cutting parts 432 is the same as the number of transportation grooves 400. In this embodiment, three transportation grooves 400 are provided, and three corresponding cutting parts 432 are provided, and the three cutting parts 432 are annularly and equally spaced around the axis of the socket part 431.

[0068] It should be noted that the socket part 431 and the cutting part 432 can be an integral structure or a non-integral structure.

[0069] It should also be noted that in this embodiment, the outer edge of the socket part 431 does not protrude from the groove surface of the transportation groove 400. In this way, the transportation efficiency of the transportation groove 400 can be effectively guaranteed. In other embodiments, the outer edge of the socket part 431 can protrude from the groove surface of the transportation groove 400, and a cutting edge 4311 is provided on the protruding part, so that the cutting piece 43 cuts the patches more finely and more fully during secondary cutting.

[0070] In one embodiment, the thickness of the cutting portion 432 is 0.1 mm, the circumferential width of the cutting portion 432 is D2, and the size of D2 is between 0.2 mm and 1 mm. It can be understood that the plaque to be cut enters the conveying cavity 33 along the conveying groove 400. When the main cutter head 41 rotates relative to the cutting member 43 so that the cutting portion 432 faces the first flow channel groove 410, the cutting portion 432 will form a certain obstruction to the transportation of the plaque. Thus, if the circumferential dimension of the cutting portion 432 is too large, the transportation speed of the conveying groove 400 will be reduced; if the circumferential dimension of the cutting portion 432 is too small, the strength of the cutting portion 432 will be affected. When the cutting assembly 4 performs rotary cutting, the cutting portion 432 will receive an impact force along the rotation direction, which is likely to cause the cutting portion 432 to deform, jam the main cutter head 41 or the auxiliary cutter head 42, or even break directly. Therefore, the circumferential width D2 of the cutting portion 432 is between 0.2 mm and 1 mm, which can not only ensure the strength of the cutting portion 432 and reduce the risk of deformation, but also reduce the impact on the transportation rate.

[0071] It should be noted that the two side surfaces of the cutting portion 432 are parallel or substantially parallel. Such a setting is not only beneficial to the processing of the cutting member 43, but also can ensure the toughness and strength of the cutting portion 432, improve the cutting ability of the cutting member 43, and can also ensure the connection area between the cutting portion 432 and the inner wall of the protective ring 44, and improve the reliability of the joint between the cutting portion 432 and the protective ring 44.

[0072] In one embodiment, each cutting portion 432 has 4 side edges, and each side edge is formed with a first cutting edge 4321 to improve the cutting efficiency.

[0073] Please refer to Figure 6 , in one embodiment, the axial dimension range of the assembly gap D1 formed by the proximal end face of the second rotary cutting portion 414 and the distal end face of the main body portion 421 is between 0.14 mm and 0.24 mm. In this embodiment, the axial dimension of the assembly gap D1 is 0.2 mm.

[0074] It should be noted that the cutting piece 43 is a metal sheet. When cutting the plaque in the cutting transport groove 400, it will be impacted by the plaque, causing micro-deformation in the axial direction of the cutting piece 43. If the assembly gap D1 is too small, the micro-deformed cutting piece 43 will get stuck with the main cutting head 41 or the auxiliary cutting head 42, thus affecting plaque cutting. If the assembly gap D1 is too large, on the one hand, the plaque in the transport groove 400 will fill the assembly gap D1, thereby hindering the rotation of the main cutting head 41 and the auxiliary cutting head 42. On the other hand, the gap between the cutting piece 43 and the main cutting head 41 or the auxiliary cutting head 42 is relatively large, thus reducing the shearing ability of the cutting piece 43 and the main cutting head 41 or the auxiliary cutting head 42 in cooperation with the plaque, and further causing insufficient secondary cutting. Therefore, the size range of the assembly gap D1 is between 0.14 mm and 0.24 mm, which can not only ensure the shearing ability of the cutting 43 and the main cutting head 41 or the auxiliary cutting head 42 in cooperation with the plaque, but also avoid jamming of the main cutting head 41 and the auxiliary cutting head 42.

[0075] Please refer to Figure 7 and Figure 10 , in one embodiment, the protective ring 44 includes an inner ring 441 and an outer ring 442. The outer ring 442 is sleeved on the inner ring 441, and the inner side wall of the inner ring 441 is connected to the cutting part 432. The proximal end face of the inner ring 441 forms a second stepped surface 443 on the inner side wall of the outer ring 442. The distal end face of the main body part 421 abuts against the second stepped surface 443. In this embodiment, the inner ring 441 and the outer ring 442 are integrally formed. In other embodiments, the inner ring 441 and the outer ring 442 can also be fixedly connected by means of welding fixation, snap fixation, etc.

[0076] In one embodiment, the distal end of the inner ring 441 protrudes from the distal end face of the outer ring 442 to form a first stepped portion 444, and the first stepped surface 415 (refer to Figure 6 ) abuts against the distal end face of the first stepped portion 444.

[0077] It can be understood that when using the cutting assembly 4 to cut the plaque, it is necessary to make the main cutting head 41 abut tightly against the plaque in the axial direction. And the protective ring 44 arranged in this way can provide axial supporting force when the main cutting head 41 abuts tightly against the plaque, which is beneficial for the main cutting head 41 to abut against and cut the plaque.

[0078] Please continue to refer to Figure 7 and Figure 10, in one embodiment, the main body portion 421 includes a third rotary cutting portion 4211 and a fourth rotary cutting portion 4212 connected to the proximal end of the third rotary cutting portion 4211. A plurality of third cutting edges 42111 are formed on the third rotary cutting portion 4211, and the second flow channel groove 420 is located between adjacent third cutting edges 42111. The third cutting edge 42111 cooperates with the inner wall of the inner ring 441 to grind the plaque entering the second flow channel groove 420, so that the plaque entering through the second flow channel groove 420 into the delivery cavity 33 (refer to Figure 4 ) becomes further fragmented.

[0079] In one embodiment, a fourth cutting edge 42112 is formed at the distal edge of the third rotary cutting portion 4211. When the main cutting head 41 and the auxiliary cutting head 42 rotate, the fourth cutting edge 42112 cooperates with the cutting member 43 to perform secondary cutting on the plaque entering the second flow channel groove 420 from the first flow channel groove 410, making the plaque transported into the delivery cavity 33 by the transport groove 400 more fragmented, which is beneficial to improving the transport rate of the delivery cavity 33 (refer to Figure 4 ) and reducing the risk of blockage of the delivery cavity 33. At the same time, when the auxiliary cutting head 42 rotates, the third cutting edge 42111 cooperates with the inner wall of the inner ring 441 to be able to grind the plaque in the second flow channel groove 420, making the plaque entering the delivery cavity 33 further fragmented.

[0080] Please refer to Figure 6 and Figure 7 , in one embodiment, at least two first flow channel grooves 410 and two second flow channel grooves 420 are provided, and the first flow channel grooves 410 and the second flow channel grooves 420 correspond to each other one by one. In this embodiment, three first flow channel grooves 410 and three second flow channel grooves 420 are provided, forming three transport grooves 400, which can effectively ensure the transport speed of the cut plaque; and, by providing three first flow channel grooves 410 and three second flow channel grooves 420, three first cutting edges 4131 and three third cutting edges 42111 are respectively formed on the main cutting head 41 and the auxiliary cutting head 42. With such a setting, the cutting assembly 4 can take into account both the cutting efficiency and the transport speed, which is beneficial to plaque cutting and the transport of cutting waste. In other embodiments, the number of the first flow channel grooves 410 and the second flow channel grooves 420 can also be four, five, etc.

[0081] In one embodiment, the first rotary cutting portion 413 includes a plurality of rotary cutting arms, and two first cutting edges 4131 are formed on the side edges of each rotary cutting arm, and the first flow channel groove 410 is located between two adjacent first cutting edges 4131 of two adjacent rotary cutting arms. With such a setting, a relatively large number of first cutting edges 4131 can be provided on the basis of taking into account the width of the first flow channel groove 410, so as to balance the cutting efficiency and the transport efficiency.

[0082] In one embodiment, the third rotary cutting part 4211 includes a plurality of rotary cutting arms. Two first cutting edges 4131 are formed on the side edges of each rotary cutting arm. The first flow channel groove 410 is located between two adjacent third cutting edges 42111 of two adjacent rotary cutting arms. With such a setting, a relatively large number of third cutting edges 42111 can be provided while taking into account the width of the second flow channel groove 410, so as to balance the cutting efficiency and the transportation efficiency.

[0083] Please refer to Figure 5 , Figure 10 and Figure 11 , in one embodiment, the radial dimension of the third rotary cutting part 4211 is greater than that of the fourth rotary cutting part 4212, and the radial dimension of the fourth rotary cutting part 4212 is smaller than the inner diameter of the flared part 313. A third stepped surface 4213 is formed at the junction of the third rotary cutting part 4211 and the fourth rotary cutting part 4212. It can be understood that the radial dimension of the fourth rotary cutting part 4212 being smaller than the inner diameter of the flared part 313 can prevent the fourth rotary cutting part 4212 from rubbing against the inner side wall of the flared part 313, which is beneficial to improving the smoothness of the rotary cutting of the attached cutting head 42 and reducing the wear of the attached cutting head 42. It should be noted that a notch is provided on the outer side wall of the distal side of the fourth rotary cutting part 4212, which is beneficial to the processing of the third stepped surface 4213.

[0084] In one embodiment, the axial length of the third rotary cutting part 4211 is smaller than that of the fourth rotary cutting part 4212, and the fourth rotary cutting part 4212 is inserted into the flared part 313. It should be noted that the inner diameter of the flared part 313 is smaller than the inner diameter of the outer ring 442. The axial length of the fourth rotary cutting part 4212 is relatively long and it is installed in the inner cavity of the flared part 313. With such a setting, the gap between the side wall of the fourth rotary cutting part 4212 and the inner wall of the flared part 313 is small, which can prevent the attached cutting head 42 from shaking during rotation.

[0085] Please refer to Figure 10 and Figure 11 , in one embodiment, when the cutting assembly 4 (refer to Figure 3 ) cuts the plaque, the distal end face of the reduced diameter section 3131 abuts against the third stepped surface 4213, which can better provide an axial supporting force for the attached cutting head 42. The main cutting head 41 is fixedly welded to the distal end of the attached cutting head 42. Therefore, the distal end face of the reduced diameter section 3131 abutting against the third stepped surface 4213 can also provide an axial supporting force for the main cutting head 41, thereby reducing the risk of axial retreat towards the proximal end due to the frictional loss at the abutting end face between the main cutting head 41 and the protective ring 44.

[0086] Please return to Figure 5 and Figure 7, in one embodiment, the cutting assembly 4 further includes a protective cover 45. The protective cover 45 is sleeved on the first rotary cutting portion 413 and the first stepped portion 444, and the proximal end of the protective cover 45 is fixedly connected to the proximal end of the outer ring 442 of the protective ring 44. It can be understood that the protective cover 45 is a hollow structure, enabling the plaque to be cut to enter the protective cover 45 for the main cutting head 41 to cut. The protective cover 45 can prevent the first cutting edge 4131 of the main cutting head 41 from being exposed, thereby preventing damage to the blood vessel wall when the main cutting head 41 rotates at high speed. In this embodiment, both the protective ring 44 and the protective cover 45 are metal components, and the protective ring 44 and the protective cover 45 are fixed by welding.

[0087] In one embodiment, the protective cover 45 includes: a first annular member 451, a second annular member 452, and a connecting member 453. The second annular member 452 is disposed on the distal side of the first annular member 451. One end of the connecting member 453 is connected to the first annular member 451, and the other end is connected to the second annular member 452. Among them, the first annular member 451 is connected to the distal end of the outer ring 442. The connecting portion 422 passes through the first annular member 451 and the second annular member 452, and the connecting portion 422 is not fixedly connected to the second annular member 452. A second cutting edge 4531 is provided on the connecting member 453, and the second cutting edge 4531 is used to cooperate with the first cutting edge 4131 (refer to Figure 8 ) to shear the plaque.

[0088] In this embodiment, the radial dimension of the first annular member 451 is greater than that of the second annular member 452. There are three connecting members 453, and the adjacent connecting members 453 are spaced apart from each other and form a hollow structure with the first annular member 451 and the second annular member 452 to allow the plaque to be cut to enter the cutting assembly 4.

[0089] Please refer to Figure 2 , Figure 12 and Figure 13 , in one embodiment, the coupling component 14 further includes a coupling assembly 142 and a proximal joint 143 connected to the proximal end of the coupling assembly 142. Among them, the coupling assembly 142 includes: a clamping shaft 1421, a pressing ring 1422, and a locking shaft 1423.

[0090] The clamping shaft 1421 is sleeved on the torque shaft 2 and has a clamping section 14211 that can radially contract. When the clamping section 14211 is radially squeezed, it radially contracts to clamp the torque shaft 2. The extrusion ring 1422 is sleeved on the clamping shaft 1421 and is connected to the power device 11. The extrusion ring 1422 is used to squeeze the clamping section 14211 to make the clamping section 14211 radially contract so as to clamp the torque shaft 2. The locking shaft 1423 is sleeved on the torque shaft 2 and one end thereof is sleeved by the end of the clamping shaft 1421 away from the clamping section 14211. In one embodiment, the locking shaft 1423 and the clamping shaft 1421 are assembled by means of screw fit.

[0091] When the torque transmitted by the extrusion ring 1422 is less than the maximum static friction force between the coupling assembly 142 and the torque shaft 2, the coupling component 142 can transmit the torque to the torque shaft 2 through the friction between the clamping shaft 1421 and the torque shaft 2 to drive the torque shaft 2 to rotate; otherwise, the static friction between the coupling component 142 and the torque shaft 2 changes to sliding friction, causing relative movement between the coupling component 142 and the torque shaft 2.

[0092] Thus, when the torque shaft 2 is instantaneously overloaded due to an accident and the torque transmitted by the extrusion ring 1422 is not greater than the maximum static friction force between the clamping section 14211 and the torque shaft 2, relative sliding occurs between the clamping shaft 13211 and the torque shaft 2, that is, slipping, thereby avoiding damage to blood vessels caused by the torque shaft 2 under abnormal conditions.

[0093] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of concise description, 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, it should be considered to be within the scope described in this specification.

[0094] The above-disclosed are only the preferred embodiments of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A cutting component, characterized in that, Comprising: A main cutting head having a first flow channel groove extending along its axial direction; An auxiliary cutting head having a second flow channel groove extending along its axial direction, and the first flow channel groove is aligned with the second flow channel groove to form a transport groove. The auxiliary cutting head includes a main body portion and a connecting portion connected to the main body portion. The connecting portion is connected to the main cutting head so that the auxiliary cutting head and the main cutting head can rotate synchronously, and there is an assembly gap between the main body portion and the main cutting head; A protective ring sleeved on the proximal end of the main cutting head and the distal end of the main body portion; A cutting member disposed in the assembly gap and connected to the protective ring so that the cutting member cannot rotate synchronously with the main cutting head. The cutting member is used to cooperate with the proximal end face of the main cutting head and / or the distal end face of the auxiliary cutting head to shear undesired substances passing through the transport groove.

2. The cutting assembly according to claim 1, wherein, The cutting member includes: A socket portion sleeved on the connecting portion and not fixedly connected to the connecting portion; and, A cutting portion, one end of which is connected to the socket portion, and the other end extends radially and is connected to the protective ring. The cutting portion is used to cut undesired substances entering the second flow channel groove through the first flow channel groove.

3. The cutting assembly according to claim 2, wherein, The circumferential width of the cutting portion is less than the width of the transport groove, and the circumferential width range of the cutting portion is 0.2 - 1.0 mm.

4. The cutting assembly according to claim 2, wherein, A plurality of the cutting portions are provided, and the plurality of cutting portions are circumferentially spaced apart along the socket portion, and first cutting edges are provided on all of the plurality of cutting portions.

5. The cutting assembly according to claim 1, characterized in that The main cutting head includes: a first rotary cutting portion and a second rotary cutting portion connected to the proximal end of the first rotary cutting portion. A plurality of first cutting edges are formed on the first rotary cutting portion. The first flow channel groove is located between adjacent first cutting edges, and the first flow channel groove extends from the first rotary cutting portion to the second rotary cutting portion.

6. The cutting assembly according to claim 5, wherein A second cutting edge is formed on the proximal edge of the second rotary cutting portion, and the extension line of the second cutting edge intersects with the extension line of the first cutting edge.

7. The cutting assembly according to claim 5, wherein The cutting assembly further includes a protective cover sleeved on the first rotary cutting portion and fixedly connected to the protective ring. The protective cover is a hollow structure, and a second cutting edge is provided on the protective cover. The second cutting edge cooperates with the first cutting edge to cut undesired substances.

8. The cutting assembly according to claim 7, wherein, The protective cover includes: A first annular member fixedly connected to the distal end of the protective ring; A second annular member disposed on the distal side of the first annular member. The second annular member is sleeved on the connecting portion and not fixedly connected to the connecting portion; and, A connecting member, one end of which is connected to the first annular member and the other end is connected to the second annular member to form a hollow structure; the second cutting edge is provided on the side edge of the connecting member.

9. The cutting assembly according to claim 6, wherein The main body portion includes: a third rotary cutting portion and a fourth rotary cutting portion connected to the proximal end of the third rotary cutting portion. A plurality of third cutting edges are formed on the third rotary cutting portion. The second flow channel groove is located between adjacent third cutting edges, and the second flow channel groove extends from the third rotary cutting portion to the fourth rotary cutting portion.

10. The cutting assembly according to claim 9, wherein, A fourth cutting edge is formed on the distal edge of the third rotary cutting part, and the extension line of the fourth cutting edge intersects with the extension line of the third cutting edge.

11. The cutting assembly according to claim 9, wherein, The protective ring includes an inner ring and an outer ring; the outer ring is sleeved on the inner ring, the inner side wall of the inner ring is connected to the cutting member, the distal end of the inner ring protrudes from the distal end face of the outer ring to form a first stepped portion, the radial dimension of the first rotary cutting part is larger than that of the second rotary cutting part, and a first stepped surface is formed at the joint of the first rotary cutting part and the second rotary cutting part. The first stepped surface abuts against the distal end face of the first stepped portion, and the protective cover is sleeved on the first stepped portion. The proximal end face of the protective cover abuts against the distal end face of the outer ring.

12. The cutting assembly according to claim 9, wherein The protective ring includes an inner ring and an outer ring; the outer ring is sleeved on the inner ring, the inner side wall of the inner ring is connected to the cutting member, and a second stepped surface is formed at the joint of the proximal end of the inner ring and the inner side wall of the outer ring. The distal end of the third rotary cutting part abuts against the second stepped surface.

13. A veneer cutting device, characterized in that, Comprising: A control handle, in which a power device is arranged; A catheter assembly, the proximal end of which is connected to the control handle; A torque shaft, passing through the catheter assembly, the proximal end of the torque shaft penetrates into the control handle and is connected to the power device; and, A cutting assembly according to any one of claims 1-12, the proximal end of the protective ring is connected to the distal end of the catheter assembly; the proximal end of the main body part is connected to the distal end of the torque shaft and can rotate synchronously with the torque shaft.

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