Coupling device and rotary cutting equipment

Abstract

The invention relates to a coupling device and rotary cutting equipment, the coupling device is used for connecting a torque shaft and a power device, the coupling device comprises a coupling part, and the coupling part comprises a clamping shaft which is arranged on the torque shaft in a sleeving mode and comprises an assembling section and a clamping section which is connected with the assembling section and can contract in the radial direction; the locking shaft is arranged on the torque shaft in a sleeving mode, and the assembling section is arranged on the locking shaft in a sleeving mode, or the locking shaft is arranged on the assembling section in a sleeving mode; and the extrusion ring is used for being connected with a power device, and the extrusion ring is arranged on the assembling section or the locking shaft in a sleeving mode, so that the clamping section is shrunk in the radial direction to clamp the torque shaft. According to the coupling device, under the condition of abnormal overload, the torque shaft loses a power source, so that damage to blood vessels under the overload condition is avoided, and the safety of clinical use is improved.

Description

Technical Field

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

[0002] The information provided in this section 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-sized 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 that leads to restenosis. In some cases, rotational atherectomy can be used to treat restenosis by removing scar tissue.

[0005] Existing rotational cutting devices for plaques generally include: a handle, a catheter assembly, a torque shaft, a cutting assembly, and a drive motor. The proximal end of the torque shaft is coupled to the drive motor, and the drive motor drives the torque shaft to rotate, causing the cutting assembly assembled at the distal end of the torque shaft to perform rotational cutting or rotational grinding on the plaques.

[0006] However, when the cutting assembly cuts into the fascia of the blood vessel wall, and / or, due to reasons such as wear or cutting debris entering the assembly gap, the torque shaft encounters an accidental jam. In this case, the torque provided by the drive motor will have an abnormal instantaneous overload due to the jam. Under overload conditions, when the torque shaft continues to rotate, it is easy to cause damage to the blood vessel, and the surgical risk is relatively high. Summary of the Invention

[0007] Based on this, it is necessary to provide a coupling device capable of overload protection.

[0008] Furthermore, a rotational cutting device capable of overload protection is also provided.

[0009] A coupling device for connecting a torque shaft and a power device, comprising: a coupling member, the coupling member including: a clamping shaft sleeved on the torque shaft, including an assembly section and a clamping section connected to the assembly section and capable of radially contracting; a locking shaft sleeved on the torque shaft, and the assembly section is sleeved on the locking shaft, or the locking shaft is sleeved on the assembly section; an extrusion ring for connecting with the power device, and the extrusion ring is sleeved on the assembly section or the locking shaft, so that the clamping section radially contracts to clamp the torque shaft; when the torque transmitted by the extrusion ring is not greater than the maximum static friction force between the coupling member and the torque shaft, the extrusion ring can drive the torque shaft to rotate, otherwise, relative movement occurs between the coupling member and the torque shaft.

[0010] In one embodiment, the clamping shaft has a channel axially penetrating the assembly section and the clamping section, and an internal thread is provided on the inner side wall of the assembly section; a threaded post is provided on the locking shaft close to the clamping shaft, and an external thread is provided on the threaded post, and the external thread cooperates with the internal thread to movably connect the assembly section and the locking shaft; or, an external thread is provided on the assembly section, an internal thread is provided on the threaded post, and the external thread of the threaded post cooperates with the internal thread to movably connect the assembly section and the locking shaft.

[0011] In one embodiment, the clamping section is provided with a slot extending in the axial direction, and the slot communicates with the channel; when the extrusion ring is sleeved on the assembly section, the extrusion ring forces the slot to close to achieve radial contraction.

[0012] In one embodiment, one end of the clamping section far from the assembly section is a chuck end, the radial dimension of the chuck end is greater than the radial dimension of the assembly section, and one side of the chuck end close to the extrusion ring is provided with an inclined surface inclined from the side of the extrusion ring to the side of the chuck end.

[0013] In one embodiment, the coupling member further includes a pressure-bearing pipe sleeved on the torque shaft and passing through the locking shaft and the clamping shaft.

[0014] In one embodiment, the coupling device further includes: a first joint member having a first inner cavity axially penetrating, and one end of the first inner cavity is a first flared section; a first bearing installed in the first flared section and fixedly connected to the end of the locking shaft far from the assembly section; a second joint member having a second inner cavity axially penetrating, and one end of the second inner cavity close to the first joint member is a second flared section; and a second bearing installed in the second flared section and fixedly connected to the clamping shaft.

[0015] In one embodiment, the locking shaft includes an abutting portion, a first mounting portion, and a second mounting portion that are connected in sequence from the proximal end to the distal end. The radial dimension of the abutting portion is greater than that of the first mounting portion, and the radial dimension of the first mounting portion is greater than that of the second mounting portion. The first mounting portion extends into the first bearing, and the distal end of the abutting portion abuts against the proximal end of the first bearing, and the proximal end abuts against the pressing portion.

[0016] In one embodiment, the coupling device further includes a sealing ring and a gasket. The sealing ring is sleeved on the second mounting portion, and the gasket is disposed between the sealing ring and the first bearing.

[0017] A rotary cutting device includes: a control handle with a power device disposed therein; the coupling device as described above, which is installed in the control handle and connected to the power device to transmit the torque output by the power device to the torque shaft; a catheter assembly, the proximal end of which penetrates into the control handle and is connected to the coupling device; and a cutting assembly connected to the distal end of the catheter assembly. The torque shaft penetrates the catheter assembly, and the distal end of the torque shaft is connected to the cutting assembly to drive the cutting assembly to rotate.

[0018] In one embodiment, the control handle includes a housing. The coupling device further includes a first joint component and a second joint component. The first joint component includes an axially extending section and a branch section connected to the axially extending section. The axially extending section is fixed in the housing, and one end of the branch section away from the axially extending section extends out of the housing, and the branch section is clamped by the housing. One end of the second joint component is fixed in the housing, and the other end extends out of the housing and is clamped by the housing. The end of the locking shaft away from the clamping shaft is connected to the axially extending section, and the end of the clamping shaft away from the locking shaft is connected to the end of the second joint component located in the housing.

[0019] In one embodiment, the axially extending section has a first inner cavity that axially penetrates. The catheter assembly is connected to the axially extending section, and a branch channel is formed on the branch section. The branch channel, the first inner cavity, and the catheter assembly are in communication.

[0020] In the coupling device provided in the embodiment of the present invention, the coupling component includes a clamping shaft, an extrusion ring and a locking shaft. Through the cooperation between the clamping shaft, the extrusion ring and the locking shaft, the clamping section of the clamping shaft is radially contracted under the action of the extrusion ring, the torque shaft is clamped, and friction is generated between the clamping shaft and the torque shaft. When the torque transmitted by the coupling component is not greater than the maximum static friction between the clamping section and the torque shaft, the clamping shaft transmits the torque to the torque shaft through the static friction between the clamping section and the torque shaft, so that the torque shaft rotates; when the torque transmitted by the coupling component is greater than the maximum static friction between the clamping section and the torque shaft, the static friction between the clamping section and the torque shaft is converted into sliding friction, so that relative sliding occurs between the clamping shaft and the torque shaft, that is, slipping, so as to realize overload protection of the torque shaft, so that the torque shaft loses its power source, thereby avoiding damage to the blood vessels under overload conditions, and improving the safety of clinical use.

[0021] The rotary cutting device provided by the embodiment of the present invention connects the power device and the torque shaft through a coupling device to achieve overload protection. When the torque shaft encounters an unexpected jam, the torque shaft loses its power source, thereby avoiding damage to the blood vessels under overload conditions and improving the safety of clinical use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0023] in:

[0024] Figure 1 It is a schematic diagram of the overall structure of the rotary cutting device in one embodiment.

[0025] Figure 2 It is a schematic diagram of the structure of the rotary cutting device after the control handle is opened in one embodiment.

[0026] Figure 3 Schematic diagram of the overall structure of the coupling device and the torque shaft in one embodiment.

[0027] Figure 4 1 is an exploded view of a coupling device and a torque shaft in one embodiment.

[0028] Figure 5 For along Figure 3 Sectional view after cutting along the center cutting line AA.

[0029] Figure 6 FIG. 4 is an exploded view of a coupling component in one embodiment.

[0030] Figure 7Exploded view of the coupling component in another embodiment.

[0031] Figure 8 Cross-sectional view of the coupling device and the torque shaft after sectioning in one embodiment.

[0032] Figure 9 Cross-sectional view of the coupling component and the torque shaft after sectioning in one embodiment.

[0033] Figure 10 Cross-sectional view of the coupling component and the torque shaft after sectioning in another embodiment.

[0034] Figure 11 Cross-sectional view of the coupling device and the torque shaft after sectioning in another embodiment. Detailed implementation

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0036] In the description of the embodiments of the present invention, it should be noted that, as terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0037] 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", "connection" 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 elements. 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.

[0038] In the field of interventional medical devices, the end of a medical device implanted in a human or animal body that is closer to the operator is generally called the "proximal end", and the end that is farther from the operator is called the "distal end". The "proximal end" and "distal end" of any component of the medical device are defined based on this principle. "Axial" generally refers to the length direction of the medical device when it is transported, and "radial" generally refers to the direction of the medical device that is not parallel to its "axial direction". The "axial" and "radial" of any component of the medical device are defined based on this principle. "Circumferential" refers to the circumferential direction, that is, the axial direction surrounding the lumen structure or column.

[0039] See also Figures 1 to 3 The embodiment of the present invention relates to a rotary cutting device 1, which is mainly used to perform rotary cutting on plaques formed on arterial walls. In this embodiment, the rotary cutting device 1 includes: a control handle 100, a torque shaft 200, a coupling device 300, a catheter assembly 400 and a cutting assembly 500.

[0040] Specifically, a power device 110 is provided in the control handle 100. The torque shaft 200 is penetrated by a coupling device 300 and a catheter assembly 400, and the distal end is connected to a cutting assembly 500. The coupling device 300 is installed in the control handle 100, and the coupling device 300 is connected to the power output end of the power device 110, so as to transmit the torque output by the power device 110 to the torque shaft 200. The proximal end of the catheter assembly 400 penetrates into the control handle 100 and is connected to the coupling device 300. The cutting assembly 500 is arranged on the distal side of the catheter assembly 400, and a part of it is connected to the catheter assembly 400, and the other part is connected to the distal end of the torque shaft 200. The cutting assembly 500 is used to cut the plaque formed on the arterial blood vessel wall.

[0041] See also Figure 1 and Figure 2 In one embodiment, the control handle 100 includes: a housing 120, a transmission gear set 130, a power supply 140 and a control switch 150.

[0042] Among them, the housing 120 is provided with a position (not shown in the drawings) for installing the power device 110, the transmission gear set 130, the power supply 140 and the control switch 150. The transmission gear set 130 is installed on the proximal side of the housing 120 and is connected to the power output shaft of the power device 110, so that the power output shaft of the power device 110 is connected to the coupling device 300 through the transmission gear set 130. The power supply 140 is installed in the housing 120 and is located on the distal side of the power device 110. The power supply 140 is electrically connected to the power device 110 to supply power to the power device 110. The control switch 150 is installed on the housing 120 and is electrically connected to the power device 110 and the power supply 140 to control the opening and closing of the power device 110.

[0043] It should be noted that, in this embodiment, the housing 120 includes an upper housing and a lower housing, and the power device 110, the transmission gear set 130, the power supply 140 and the control switch 150 are all fixedly assembled in the housing 120 through the upper housing and the lower housing. A groove 121 and an anti-slip convex strip 122 are provided on the outer side wall of the housing 120. The groove 121 is located on the lower side wall of the housing 120, and the anti-slip convex strip 122 is located on the upper side wall of the housing 120. The arrangement of the groove 121 and the anti-slip convex strip 122 is conducive to holding the control handle 100, and thus facilitates the operation of the peeling device 1. In addition, a bending adjustment structure 600 is also provided on the housing 120 for adjusting the bend of the catheter assembly 400.

[0044] See also Figures 3 to 6 In one embodiment, the coupling device 300 includes a coupling component 330. The torque shaft 200 passes through the coupling component 330, and the coupling component 300 is tightly attached to the outer wall of the torque shaft 200 so as to transmit the torque to the torque shaft 200.

[0045] In one embodiment, the coupling component 330 includes a clamping shaft 331 , a pressing ring 332 and a locking shaft 333 .

[0046] Specifically, the clamping shaft 331 is sleeved on the torque shaft 200 and has a clamping section 3311 that can contract radially. When the clamping shaft 331 is subjected to radial compression, it contracts radially to clamp the torque shaft 200. The extrusion ring 332 is sleeved on the clamping shaft 331 and connected to the power device 110. The extrusion ring 332 is used to squeeze the clamping section 3311 to make the clamping section 3311 contract radially to clamp the torque shaft 200. The locking shaft 333 is sleeved on the torque shaft 200 and one end of the locking shaft 333 is sleeved by the end of the clamping shaft 331 away from the clamping section 3311.

[0047] It should be noted that when the coupling component 330 is assembled, the torque shaft 200 is respectively penetrated with the locking shaft 333 and the clamping shaft 331, and the extrusion ring 332 is sleeved on the clamping shaft 331; the clamping shaft 331 is sleeved on the locking shaft 333, so that the clamping shaft 331 and the locking shaft 333 cooperate with each other, and the extrusion ring 332 is pushed toward the clamping section 3311 until the clamping section 3311 clamps the torque shaft 200. At this time, the coupling component 330 is assembled. It is worth noting that after the coupling component 330 is assembled, the clamping shaft 331, the extrusion ring 332 and the locking shaft 333 are in the transmission gear set 130 (see Figure 2 ) is driven to rotate synchronously or stop rotating.

[0048] It should also be noted that when the torque transmitted by the extrusion ring 332 is not greater than the maximum static friction force between the coupling member 330 and the torque shaft 200, the coupling member 330 can transmit the torque to the torque shaft 200 through the friction between the clamping shaft 331 and the torque shaft 200 to drive the torque shaft 200 to rotate; otherwise, the static friction between the coupling member 330 and the torque shaft 200 changes to sliding friction, causing relative movement between the coupling member 330 and the torque shaft 200.

[0049] It can be understood that the connection between the locking shaft 333 and the clamping shaft 331 is such that the locking shaft 333 can abut against the extrusion ring 332 to keep the clamping section 3311 clamped to the torque shaft 200. For example, the locking shaft 333 can also be sleeved on one end of the clamping shaft 331 away from the clamping section 3311.

[0050] Please refer to Figure 3 、 Figure 5 and Figure 6 In one embodiment, the clamping shaft 331 further has an assembly section 3312, and the assembly section 3312 is connected to the clamping section 3311. The assembly section 3312 is cylindrical and is used for assembling with the locking shaft 333. The extrusion ring 332 is sleeved on the assembly section 3312 to radially contract the clamping section 3311, thereby clamping the torque shaft 200 tightly.

[0051] In one embodiment, the extrusion ring 332 includes: a gear assembly portion 3321 and an extrusion portion 3322. The gear assembly portion 3321 is sleeved on the extrusion portion 3322. The outer surface of the gear assembly portion 3321 forms a friction surface to facilitate sleeving with the transmission gear in the transmission gear set 130 (please refer to Figure 2 ) to drive the clamping shaft 331 to rotate. The extrusion portion 3322 is used to cooperate with the clamping section 3311. The inner surface of the extrusion portion 3322 is a smooth surface, so that the extrusion portion 3322 can closely adhere to the surface of the assembly section 3312 to contract the clamping section 3311, thereby clamping the torque shaft 200. It should be noted that in other embodiments, the gear assembly portion 3321 and the extrusion portion 3322 can be an integral structure.

[0052] It should also be noted that the distal end face of the gear assembly portion 3321 is used to abut against the locking shaft 333, so that the locking shaft 333 restricts the axial displacement of the extrusion ring 332 towards the distal end, thereby maintaining the state where the extrusion ring 332 radially compresses and clamps the clamping shaft 331.

[0053] Please refer to Figures 3 to 6In one embodiment, the clamping shaft 331 has an axially penetrating channel 3310, and an internal thread 3313 is provided on the inner side wall of the channel located at the assembly section 3312. A threaded column 3331 is provided on the locking shaft 333 near the clamping shaft 331. The locking shaft 333 and the clamping shaft 331 are movably connected by the threaded column 3331 and the internal thread 3313.

[0054] It should be noted that after the locking shaft 333 is locked by the threaded column 3331 and the internal thread 3313, its end face will abut against the distal end face of the extrusion ring 332, and the proximal end face of the extrusion ring 332 abuts against the distal end face of the clamping section 3311, thereby limiting the axial displacement of the extrusion ring 332. In this way, under the extrusion action of the extrusion ring 332, the clamping section 3311 contracts radially to clamp the torque shaft 200.

[0055] See also Figure 6 In one embodiment, a slot 3314 extending along the axial direction of the clamping shaft 331 is formed on the clamping section 3311 , and the slot 3314 is connected to the channel 3310 .

[0056] It should be noted that when the extrusion ring 332 is sleeved on the locking shaft 333, the slot 3314 is gradually closed under the extrusion of the extrusion ring 332 to achieve radial contraction of the clamping section 3311. It is understandable that the higher the degree of closure of the slot 3314, the greater the clamping section 3311 is on the torque shaft 200 (see Figure 3 ) The higher the degree of clamping, the greater the maximum static friction between the clamping shaft 331 and the torque shaft 200. In this way, the maximum static friction between the clamping shaft 331 and the torque shaft 200 can be adjusted by adjusting the squeezing force of the squeezing ring 332 on the clamping shaft 331, thereby adjusting the maximum torque transmitted to the torque shaft 200.

[0057] In one embodiment, the end of the clamping section 3311 away from the locking shaft 333 is a chuck end. The radial dimension of the chuck end is greater than the radial dimension of the assembly section 3312. When the extrusion ring 332 is sleeved on the assembly section 3312, the proximal end face of the extrusion ring 332 abuts against the distal end face of the chuck end.

[0058] See also Figure 6 In one embodiment, the end surface of the chuck end close to the extrusion ring 332 is a bevel 3315, which is conducive to the extrusion ring 332 to press against the chuck end, making it easier for the clamping section 3311 to clamp the torque shaft 200 (see Figure 3 In this embodiment, the inclined surface 3315 is inclined from the proximal side to the distal side. That is, the diameter of the circumscribed circle of the proximal end of the inclined surface 3315 is greater than the diameter of the outer diameter circle of the distal end.

[0059] It can be understood that when the torque transmitted by the extrusion ring 332 is not greater than the maximum static friction force between the clamping section 3311 and the torque shaft 200, the extrusion ring 332 transmits the torque to the torque shaft 200 through the locking shaft 333 and the friction force between it and the torque shaft 200, causing the torque shaft 200 to rotate; when the torque shaft 200 is instantaneously overloaded, that is, when the torque transmitted by the extrusion ring 332 is greater than the maximum static friction force between the clamping section 3311 and the torque shaft 200, relative sliding occurs between the clamping shaft 331 and the torque shaft 200, that is, slipping, so as to avoid damaging the blood vessel by the torque shaft 200 under abnormal conditions and improve the safety of clinical use.

[0060] Please refer to Figure 7 , in other embodiments, the thread of the threaded post 3331 of the locking shaft 333 is provided on the inner surface. Correspondingly, the thread of the assembly section 3312 of the clamping shaft 331 is provided on the outer surface. The assembly section 3312 is directly sleeved on the torque shaft 200, and the threaded post 3331 of the locking shaft 333 is sleeved on the assembly section 3312, and the two are connected by thread fit. The extrusion ring 332 is sleeved on the threaded post 3331. In this way, when the torque transmitted by the extrusion ring 332 is not greater than the maximum static friction force between the clamping section 3311 and the torque shaft 200, the extrusion ring 332 transmits the torque to the torque shaft 200 through the friction force between the clamping shaft 331 and the torque shaft 200, causing the torque shaft 200 to rotate; when the torque shaft 200 is instantaneously overloaded, that is, when the torque transmitted by the extrusion ring 332 is greater than the maximum static friction force between the clamping section 3311 and the torque shaft 200, relative sliding occurs between the clamping shaft 331 and the torque shaft 200, that is, slipping, so as to avoid damaging the blood vessel by the torque shaft 200 under abnormal conditions and improve the safety of clinical use.

[0061] That is, whether the assembly section 3312 of the clamping shaft 331 is sleeved on the locking shaft 333 or the locking shaft 333 is sleeved on the assembly section 3312, through the cooperation of the clamping shaft 331, the extrusion ring 332 and the locking shaft 333, on the one hand, the torque shaft 200 is clamped multiple times, providing a certain range of static friction force, so that the power device 110 can stably drive the torque shaft 200 to rotate under normal conditions; on the other hand, in case of overload, it can overcome the maximum static friction force to provide overload protection.

[0062] Please return to Figures 3 to 5 , in one of the embodiments, the coupling component 330 further includes a pressure-bearing pipe 334. The pressure-bearing pipe 334 is sleeved on the torque shaft 200 and passes through the locking shaft 333 and the clamping shaft 331.

[0063] In this embodiment, the pressure-bearing pipe 334 is fixedly welded to the torque shaft 200, and the pressure-bearing pipe 334 is processed from stainless steel material, which has a higher pressure-bearing capacity. Therefore, the pressure-bearing pipe 334 is used to bear the clamping force and torque applied by the clamping shaft 331 to protect the torque shaft 200.

[0064] In one of the embodiments, the coupling device 300 further includes a first joint member 310 and a second joint member 320. Among them, the torque shaft 200 passes through a part of the first joint member 310 and the second joint member 320 respectively. One end of the coupling member 330 is connected to the first joint member 310, and the other end is connected to the second joint member 320.

[0065] In one of the embodiments, the first joint member 310 includes an axially extending section 316. The axially extending section 316 has a first inner cavity 3101 axially penetrating therethrough, and the side of the first inner cavity 3101 close to the second joint member 320 is a first flared section 3102. The coupling device 300 further includes a first bearing 311. The first bearing 311 is fixedly installed in the first flared section 3102. The locking shaft 333 passes through the first bearing 311 and is fixed to the first bearing 311 to axially constrain the locking shaft 333.

[0066] It should be noted that when the coupling device 300 is assembled, since the first bearing 311 axially constrains the locking shaft 333, when the coupling device 300 is driving, the power device 110 drives the coupling member 330 to rotate through the transmission gear set 130 (refer to Figure 2 ). Under the action of the first bearing 311, the resistance of the locking shaft 333 to rotate around the torque shaft 200 is very small. Therefore, it is not enough to loosen the thread fit between the clamping shaft 331 and the locking shaft 333. Therefore, the locking shaft 333, the extrusion ring 332 and the clamping shaft 331 rotate synchronously under the drive of the transmission gear set 130.

[0067] Please refer to Figures 3 to 6 , in one embodiment, the locking shaft 333 further includes: an abutting portion 3332, a first mounting portion 3333 and a second mounting portion 3334. One end of the abutting portion 3332 is connected to the threaded column 3331, and the other end is connected to the first mounting portion 3333. The proximal end face of the abutting portion 3332 abuts against the distal end face of the extrusion ring 332 to abut against the extrusion ring 332 at the distal end to prevent the extrusion ring 332 from displacing distally. The second mounting portion 3334 is connected to the distal end of the first mounting portion 3333.

[0068] It should be noted that the radial dimension of the first mounting portion 3333 is larger than that of the second mounting portion 3334, and the radial dimension of the abutting portion 3332 is larger than that of the first mounting portion 3333. Therefore, a radially extending stepped surface is formed at the junction of the first mounting portion 3333 and the second mounting portion 3334, that is, the end surface of the first mounting portion 3333 on the side close to the second mounting portion 3334.

[0069] In one embodiment, a sealing ring 312 and a gasket 313 are further arranged in the first flared section 3102. The sealing ring 312 is sleeved on the second mounting portion 3334. The sealing ring 312 is located between the bottom of the first flared section 3102 and the first bearing 311. The sealing ring 312 is used to improve the sealing performance between the locking shaft 333 and the first joint member 310. The gasket 313 is located between the sealing ring 312 and the first bearing 311. One end of the gasket 313 abuts against the part (outer ring) of the first bearing 311 fixed to the first flared section 3102, and the other end abuts against the sealing ring 312. The gasket 313 is used to axially separate the sealing ring 312 from the stepped surface and the first bearing 311 to prevent the sealing ring 312 from being worn.

[0070] It should be noted that the sealing ring 312 is made of an elastic flexible material, such as silica gel, rubber, etc. The gasket 313 is a metal washer made of a metal material and has good wear resistance. Although the fact that the sealing ring 312 is held tightly against the second mounting portion 3334 will cause a certain hindrance to the rotation of the locking shaft 333, it can improve the sealing performance between the locking shaft 333 and the first joint member 310, which is a beneficial hindrance. In other embodiments, in order to reduce the influence of the hindrance on the rotation of the locking shaft 333, a lubricant (such as silicone oil) can be applied between the locking shaft 333 and the sealing ring 312 to reduce the frictional force. The friction generated by the contact between the sealing ring 312 and the stepped surface and the first bearing 311 will not only wear the sealing ring 312, but also cause a harmful hindrance to the rotation of the locking shaft 333. Therefore, separating the sealing ring 312 from the stepped surface and the first bearing 311 by the gasket 313 can not only reduce the wear of the sealing ring 312, but also reduce the hindrance of the sealing ring 312 to the rotation of the locking shaft 333, which is beneficial to torque transmission.

[0071] In one embodiment, the second joint member 320 has a second inner cavity 3201 axially penetrating therethrough. One end of the second inner cavity 3201 close to the first joint member 310 is a second flared section 3202. The coupling device 300 further includes a second bearing 321, and the second bearing 321 is fixedly installed in the second flared section 3202. The clamping shaft 331 passes through the second bearing 321 and is fixedly connected to the second bearing 321.

[0072] It should be noted that, in this embodiment, the second bearing 321 is located between the extrusion ring 332 and the chuck end, and the proximal end face of the second axial 321 abuts against the distal end face of the chuck end, so that the second bearing 321 axially limits the clamping shaft 331 to prevent the clamping shaft 331 from axially displacing distally. At the same time, the locking shaft 333 is in threaded cooperation with the clamping shaft 331, the extrusion ring 332 is sleeved on the clamping shaft 331, and the distal end face and the proximal end face of the extrusion ring 332 are simultaneously abutted by the locking shaft 333 and the second bearing 321, so as to maintain the state of radial contraction of the chuck end and keep the torque shaft 200 in a clamped state. In addition, the arrangement of the first bearing 311 and the second bearing 321 is conducive to driving the torque shaft 200 to rotate by the coupling member 330.

[0073] Please refer to Figure 2 , the first joint component 310 and the second component 320 are both arranged on the housing 120 and fixedly connected to the housing 120. The coupling component 330 is fixed on the housing 120 by being connected to the first joint component 310 and the second component 320.

[0074] Please refer to Figure 4 and Figure 5 , in one embodiment, the first joint component 310 further includes a branch section 317. One end of the branch section 317 is connected to the axially extending section 316, and the other end extends to the outside of the housing 120 and is clamped by the housing 120. In one embodiment, the first inner cavity 3101 is communicated with the conduit assembly 400. A branch channel 3103 is formed on the branch section 317, and the branch channel 3103 is communicated with the first inner cavity 3101. The branch channel 3103 is used for discharging waste liquid. The other end of the branch section 317 extends out of the housing 120 and is clamped by the housing 120, which is beneficial to the more reliable connection of the first joint component 310 with the housing 120, so that the coupling component 330 is more reliably fixed inside the housing 120, thereby ensuring that the coupling component 330 can rotate at high speed following the power device 110. And, the first joint component 310 simultaneously functions to connect and fix the coupling component 330 and the conduit assembly 400, making the structure of the control handle 100 relatively compact.

[0075] Please refer to Figure 2 and Figure 5 , in one embodiment, the end of the second joint component 320 far from the extrusion ring 332 extends out of the housing 120 and is clamped by the housing 120, so that the coupling component 330 is more reliably fixed inside the housing 120, thereby ensuring that the coupling component 330 can rotate at high speed following the power device 110.

[0076] The coupling device 300 provided in this embodiment includes a coupling component 330, and the coupling component 330 includes a clamping shaft 331, a pressing ring 332, and a locking shaft 330. Through the cooperation among the clamping shaft 331, the pressing ring 332, and the locking shaft 330, the clamping section 3311 of the clamping shaft 331 radially contracts under the pressing action of the pressing ring 332, so that the clamping shaft 331 clamps the torque shaft 200, and thus friction is generated between the clamping shaft 331 and the torque shaft 200. Therefore, under normal circumstances, the coupling device 300 can lock the torque shaft 200.

[0077] When the torque transmitted by the coupling component 300 is not greater than the maximum static friction force between the clamping shaft 331 and the torque shaft 200, the clamping shaft 331 transmits the torque to the torque shaft 200 through the static friction between it and the torque shaft 200, causing the torque shaft 200 to rotate, thereby driving the cutting assembly 500 to rotate to cut the plaque.

[0078] When an unexpected situation such as jamming occurs to the torque shaft 200, the torque provided by the power device 110 is instantaneously overloaded abnormally due to the jamming of the torque shaft 200. The overloaded torque will overcome the maximum locking force that the coupling device 300 can provide, so that when the torque transmitted by the coupling component 330 is greater than the maximum static friction force between the clamping shaft 331 and the torque shaft 200, the static friction between the clamping shaft 331 and the torque shaft 200 is converted into sliding friction, and relative sliding occurs between the clamping shaft 331 and the torque shaft 200, that is, slipping, so that the rotation of the clamping shaft 331 cannot drive the rotation of the torque shaft 200, thereby realizing the overload protection of the torque shaft 200, causing the torque shaft 200 to lose the power source, thus avoiding damage to blood vessels under overload conditions and improving the safety of clinical use.

[0079] Please refer to Figure 2 、 Figure 8 and Figure 9 In one embodiment, the coupling component 330 includes a driving shaft 335 and a driven shaft 336. Specifically, the driving shaft 335 is connected to the power device 110, and the driving shaft 335 is sleeved on the torque shaft 200. The driven shaft 336 is sleeved on the torque shaft 200 and fixedly connected to the torque shaft 200. The end faces of the driving shaft 335 and the driven shaft 336 that are close to each other are in contact with each other, generating friction between the driving shaft 335 and the driven shaft 336, so that the driving shaft 335 drives the driven shaft 336 to drive the torque shaft 200 to rotate.

[0080] It can be understood that when the torque transmitted by the driving shaft 335 is not greater than the maximum static friction force between the driving shaft 335 and the driven shaft 336, the driving shaft 335 transmits the torque to the torque shaft 200 through the frictional force between it and the driven shaft 336; when the torque shaft 200 is instantaneously overloaded, that is, when the torque transmitted by the driving shaft 335 is greater than the maximum static friction force between the driving shaft 335 and the driven shaft 336, the driving shaft 335 slides relative to the driven shaft 336, that is, slips, so that the torque shaft 200 cannot rotate under abnormal conditions, thereby avoiding blood vessel damage and improving the safety of clinical use.

[0081] In one embodiment, the coupling member 330 further includes a retaining ring 337. The retaining ring 337 is installed at the distal end of the driving shaft 335 and can rotate synchronously with the driving shaft 335. The distal end face of the retaining ring 337 abuts against the proximal end face of the driven shaft 336, and through the static friction force between the retaining ring 337 and the driven shaft 336, the driven shaft 336 makes synchronous movement with the driving shaft 335, that is, the driving shaft 335 drives the retaining ring 337 to rotate, and the retaining ring 337 drives the driven shaft 336 to rotate, thereby driving the torque shaft 200 to rotate.

[0082] It should be noted that in this embodiment, the retaining ring 337 and the driving shaft 335 are fixed by welding. When the torque transmitted by the driving shaft 335 is not greater than the maximum static friction force between the retaining ring 337 and the driven shaft 336, the driving shaft 335 transmits the torque to the driven shaft 336 through the retaining ring 337 and static friction, and then the driven shaft 336 transmits the torque to the torque shaft 200 to drive the torque shaft 200 to rotate. Otherwise, in the case of abnormal overload, the static friction between the retaining ring 337 and the driven shaft 336 turns into dynamic friction, causing both the driving shaft 335 and the retaining ring 337 to slide relative to the driven shaft 336, that is, slip, so that the torque shaft 200 loses its power source, thereby avoiding blood vessel damage and improving the safety of clinical use.

[0083] In one embodiment, the coupling member 330 further includes a retaining ring 337. The retaining ring 337 is disposed on the distal side of the driving shaft 335, and the proximal end face of the retaining ring 337 abuts against the distal end face of the driving shaft 335. The distal end face of the retaining ring 337 abuts against the proximal end of the driven shaft 336. The retaining ring 337 makes the driven shaft 336 make synchronous movement with the driving shaft 335 through the static friction force between the driving shaft 335 and the retaining ring 337 and between the retaining ring 337 and the driven shaft 336, that is, the driving shaft 335 drives the retaining ring 337 to rotate through the frictional force, and the retaining ring 337 also drives the driven shaft 336 to rotate through the frictional force, thereby driving the torque shaft 200 to rotate.

[0084] It should be noted that in the case of abnormal overload, the torque transmitted by the coupling member 330 is greater than the static friction force between the driving shaft 335 and the pressure ring 337 and / or between the pressure ring 337 and the driven shaft 336, causing relative sliding between the driving shaft 335 and the pressure ring 337 or between the driven shaft 336 and the pressure ring 337, that is, slipping, so that the torque shaft 200 loses its power source, thereby avoiding blood vessel damage and improving the safety of clinical use.

[0085] Please refer to Figure 8 and Figure 9 In one embodiment, a boss section 3351 is provided on the distal side of the driving shaft 335. The pressure ring 337 is sleeved on the boss section 3351 and fixedly connected to the driving shaft 335. Obviously, the pressure ring 337 is sleeved on the boss section 3351, which can effectively improve the coaxiality after the assembly of the driving shaft 335 and the pressure ring 337, and is beneficial to torque transmission. At the same time, the setting of the pressure ring 337 can prevent the driving shaft 335 from directly contacting the driven shaft 336, thereby reducing the wear loss of the driving shaft 335 and playing a good protective role for the driving shaft 335.

[0086] In one embodiment, a mounting groove (not marked in the drawings) is provided on the proximal side of the driven shaft 336. A boss structure 3371 is provided at the distal end of the pressure ring 337. After the driven shaft 336 and the pressure ring 337 are assembled, the boss structure 3371 is inserted into the mounting groove, so that the contact surface between the pressure ring 337 and the driven shaft 336 is a stepped surface. In this way, not only can the coaxiality of the assembly of the pressure ring 337 and the driven shaft 336 be improved, but also the contact area between the pressure ring 337 and the driven shaft 336 can be effectively increased, the tightness and friction force of the joint part can be improved, and the stability of torque transmission between the pressure ring 337 and the driven shaft 336 through static friction force can be ensured.

[0087] In one embodiment, an assembly groove 3361 is further provided at the distal end of the mounting groove, and the assembly groove 3361 communicates with the mounting groove. The distal end of the boss section 3351 protrudes from the pressure ring 337 and is adapted to the assembly groove 3361, thereby further improving the coaxiality of the assembly of the driving shaft 335 and the driven shaft 336 and being beneficial to torque transmission.

[0088] Please refer to Figure 10 In one embodiment, the end surface where the pressure ring 337 and the driven shaft 336 are in contact with each other is an inclined surface. That is, the distal end surface of the pressure ring 337 is set as an inclined surface that slopes from the distal end to the proximal end, and the proximal end surface of the driven shaft 336 is set as a concave surface adapted to the distal end surface of the pressure ring 337. Setting the contact end surface as an inclined surface can also ensure the contact area between the pressure ring 337 and the driven shaft 336. In other embodiments, the end surfaces where the pressure ring 337 and the driven shaft 336 are in contact with each other can also be straight surfaces or arc surfaces.

[0089] Please return to Figure 8 andFigure 9 , in one embodiment, a cylindrical section 3362 is provided at the distal end of the driven shaft 336. When the driven shaft 336 is assembled with the first joint member 310, the cylindrical section 3362 is inserted into the first inner cavity 3101 to ensure the coaxiality of the connection between the driven shaft 336 and the first inner cavity 3101.

[0090] In one embodiment, a first bearing 311 and a third bearing 315 are provided in the first flared section 3102. The driven shaft 336 is installed in the first assembly cavity 3102. The driven shaft 336 passes through the first bearing 311 and is fixedly connected to the first bearing 311, while the outer wall of the first bearing 311 is fixedly connected to the side wall of the first flared section 3102. The distal portion of the driving shaft 335 extends into the first flared section 3102. The driving shaft 335 passes through the third bearing 315 and is fixedly connected to the third bearing 315, and the outer wall of the third bearing 315 is also fixedly connected to the side wall of the first flared section 3102. The provision of the first bearing 311 and the third bearing 315 facilitates torque transmission among the torque shaft 200, the driving shaft 335, and the driven shaft 336.

[0091] In another embodiment, a second bearing 321 is provided in the second flared section 3202. The proximal portion of the driving shaft 335 extends into the second flared section 3202, passes through the second bearing 321 and is fixedly connected to the second bearing 321, while the outer wall of the second bearing 321 is fixedly connected to the side wall of the second flared section 3202.

[0092] Please refer to Figure 2 、 Figure 8 and Figure 9 , in one embodiment, the coupling member 330 further includes a gear seat 338. The gear seat 338 is sleeved on the driving shaft 335 and is located between the first joint member 310 and the second joint member 320. The gear seat 338 is used to connect with the gears in the transmission gear set 130 (please refer to Figure 2 ) to transmit the torque output by the power device 110 to the driving shaft 335.

[0093] It should be noted that the gear seat 338 and the outer side wall of the driving shaft 335 are fixed by welding. In other embodiments, the gear seat 338 and the driving shaft 335 can also be integrally formed.

[0094] Please refer to Figure 11, in one embodiment, the coupling member 330 may also include only the driving shaft 335, the driven shaft 336, and the gear seat 338. Specifically, the torque shaft 200 passes through the driving shaft 335 and the driven shaft 336, and the driven shaft 336 is fixedly connected to the torque shaft 200. The distal end of the driving shaft 335 abuts against the proximal end of the driven shaft 336. The gear seat 338 is sleeved and fixed on the driving shaft 335 and is located between the first joint member 310 and the second joint member 320.

[0095] Specifically, please refer to Figure 2 and Figure 11 , the gear seat 338 is connected to the power device 110 through the transmission gear set 130. The torque output from the power output end of the power device 110 is transmitted to the gear seat 338 through the transmission gear set 130, so that the gear seat 338 drives the driving shaft 335 to rotate. The driving shaft 335 transmits the torque to the driven shaft 336 through the static friction force between the driving shaft 335 and the driven shaft 336, and then the driven shaft 336 drives the torque shaft 200 to rotate synchronously.

[0096] It should be noted that when the torque shaft 200 is instantaneously overloaded, that is, when the torque transmitted by the gear seat 338 is greater than the maximum static friction force between the driving shaft 335 and the driven shaft 336, the static friction between the driving shaft 335 and the driven shaft 336 is converted into sliding friction, and the driving shaft 335 moves relative to the driven shaft 336. In abnormal situations, it cannot drive the torque shaft 200 to rotate, thus avoiding blood vessel damage and improving the safety of clinical use.

[0097] It should be noted that in the embodiment where the coupling member 330 includes the driving shaft 335 and the driven shaft 336, the installation methods of the first joint member 310 and the second joint member 320 with the housing 120 are the same, which will not be elaborated here.

[0098] 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 as the scope described in this specification.

[0099] 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 by this. 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 coupling device for connecting a torque shaft to a power device, characterized in that, Comprising: A coupling component, the coupling component comprising: A clamping shaft sleeved on the torque shaft, including an assembly section and a clamping section connected to the assembly section and capable of radially contracting; A locking shaft sleeved on the torque shaft, and the assembly section is sleeved on the locking shaft, or the locking shaft is sleeved on the assembly section; An extrusion ring for connecting to the power device, and the extrusion ring is sleeved on the assembly section or the locking shaft, so that the clamping section radially contracts to clamp the torque shaft; When the torque transmitted on the extrusion ring is not greater than the maximum static friction force between the coupling component and the torque shaft, the extrusion ring can drive the torque shaft to rotate, otherwise, relative movement occurs between the coupling component and the torque shaft.

2. The coupling device according to claim 1, wherein The clamping shaft has a channel axially penetrating the assembly section and the clamping section, and an internal thread is provided on the inner side wall of the assembly section; a threaded post is provided on the locking shaft close to the clamping shaft side, and an external thread is provided on the threaded post, and the external thread cooperates with the internal thread to movably connect the assembly section and the locking shaft; Alternatively, an external thread is provided on the assembly section, an internal thread is provided on the threaded post, and the external thread of the threaded post cooperates with the internal thread to movably connect the assembly section and the locking shaft.

3. The coupling device according to claim 2, wherein The clamping section is provided with a slot extending in the axial direction, and the slot communicates with the channel; when the extrusion ring is sleeved on the assembly section, the extrusion ring forces the slot to close to achieve radial contraction.

4. The coupling device according to claim 1, characterized in that, One end of the clamping section far from the assembly section is a chuck end, the radial dimension of the chuck end is larger than the radial dimension of the assembly section, and the side of the chuck end close to the extrusion ring is provided with an inclined surface inclined from the side of the extrusion ring to the side of the chuck end.

5. The coupling device according to claim 1, characterized in that, The coupling component further includes a pressure-bearing pipe sleeved on the torque shaft and passing through the locking shaft and the clamping shaft.

6. The coupling device according to any one of claims 1-5, characterized in that, The coupling device further includes: A first joint component having an axially penetrating first inner cavity, and one end of the first inner cavity is a first flared section; A first bearing installed in the first flared section and fixedly connected to the end of the locking shaft far from the assembly section; A second joint component having an axially penetrating second inner cavity, and one end of the second inner cavity close to the first joint component is a second flared section; and A second bearing installed in the second flared section and fixedly connected to the clamping shaft.

7. The coupling device according to claim 6, characterized in that, The locking shaft includes an abutting portion, a first mounting portion and a second mounting portion connected in sequence from the proximal end to the distal end, the radial dimension of the abutting portion is larger than the radial dimension of the first mounting portion, the radial dimension of the first mounting portion is larger than the radial dimension of the second mounting portion, the first mounting portion extends into the first bearing, and the distal end of the abutting portion abuts against the proximal end of the first bearing, and the proximal end abuts against the extrusion portion.

8. The coupling device according to claim 7, characterized in that, The coupling device further includes a sealing ring and a gasket, the sealing ring is sleeved on the second mounting portion, and the gasket is arranged between the sealing ring and the first bearing.

9. A veneer cutting device, characterized in that, Comprising: A control handle, and a power device is arranged in the control handle; The coupling device according to claim 1, wherein the coupling device is installed in the control handle and is connected to the power device; A torque shaft, one end of which extends into the control handle and is connected to the coupling device; A catheter assembly, the proximal end of which penetrates into the control handle and is connected to the coupling device; and, A cutting assembly, connected to the distal end of the catheter assembly, the torque shaft passing through the catheter assembly, and the distal end of the torque shaft being connected to the cutting assembly to drive the cutting assembly to rotate.

10. The rotary cutting device according to claim 9, characterized in that, The control handle includes a housing, and the coupling device further includes a first joint member and a second joint member. The first joint member includes an axially extending section and a branch section connected to the axially extending section. The axially extending section is fixed in the housing, and one end of the branch section remote from the axially extending section extends out of the housing, and the branch section is clamped by the housing. One end of the second joint member is fixed in the housing, and the other end extends out of the housing and is clamped by the housing. The end of the locking shaft remote from the clamping shaft is connected to the axially extending section, and the end of the clamping shaft remote from the locking shaft is connected to the end of the second joint member located in the housing.

11. The rotary cutting device according to claim 10, characterized in that, The axially extending section has a first inner cavity axially penetrating therethrough. The catheter assembly is connected to the axially extending section. A branch channel is formed in the branch section, and the branch channel, the first inner cavity and the catheter assembly are in communication.

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