A resection device

Abstract

The application belongs to the technical field of medical devices, and particularly relates to a resection device, which comprises a handle body, a catheter connected to the handle body, and a cutter head assembly arranged at the distal end of the catheter, wherein a bending adjusting assembly is arranged on the catheter, the bending adjusting assembly comprises a first bending adjusting point, a second bending adjusting point arranged on the catheter, and a bending adjusting connecting piece for connecting the first bending adjusting point and the second bending adjusting point, and a control assembly for controlling the bending adjusting assembly is arranged on the handle body. According to the resection device in the application, the bending radius of the distal end catheter is adjusted through the bending adjusting assembly, the catheter is offset towards a predetermined direction, the orientation of the cutter head assembly is controlled, the risk of scratching and perforating the blood vessel is reduced, and an ideal blood vessel diameter can be obtained through multiple resections.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of medical devices, and particularly relates to a resection device. BACKGROUND

[0002] With the increasing degree of population aging in China and the change of dietary structure, the incidence of vascular lesions has increased sharply. Peripheral arterial disease is one of the vascular lesions, and the main cause of peripheral arterial disease is atherosclerosis, which is often manifested as ischemic changes in limbs, abdominal aorta, carotid artery and renal artery, etc. The treatment methods mainly include basic treatment dominated by drug therapy, open surgical treatment represented by classic surgical bypass and newly developed endovascular interventional therapy.

[0003] Although surgical bypass has a relatively superior long-term patency rate, endovascular interventional therapy technology is gradually accepted by clinicians and patients due to its minimally invasive, safe and effective, and repeatable advantages. Among them, peripheral plaque rotational atherectomy is mainly aimed at femoral, popliteal and infragenicular artery stenosis or occlusion.

[0004] However, the existing peripheral plaque rotational atherectomy resection system has the risk of scratching the blood vessel wall during catheter pushing. In clinical application, the resection system can adjust the bending radius of the distal tube body to offset the rotational cutter head at a certain angle, thereby more thoroughly removing the blocked plaque in the blood vessel. However, in the bending state, the distal end of the catheter forms a certain angle with the blood vessel, causing the catheter to be not aligned with the blood vessel axis, which can easily scratch the blood vessel and even cause the blood vessel to perforate.

[0005] Therefore, there is a need for a new technical means to solve the above problems of the prior art. SUMMARY

[0006] The purpose of the present application is to at least solve the problem that the cutter head assembly is easy to scratch the inner wall of the blood vessel when the existing resection device bends the catheter.

[0007] The present application provides a resection device, which comprises a handle body, a catheter connected to the handle body, and a cutter head assembly arranged at the distal end of the catheter, wherein a bending assembly is arranged on the catheter, the bending assembly comprises a first bending point, a second bending point arranged on the catheter, and a bending connecting piece for connecting the first bending point and the second bending point, and a control assembly for controlling the bending assembly is arranged on the handle body.

[0008] Through the resection device in the present application, the bending radius of the distal catheter is adjusted by the bending assembly, the catheter is offset towards the predetermined direction, and the orientation of the cutter head assembly is controlled, thereby reducing the risk of scratching the blood vessel and perforating the blood vessel, and an ideal blood vessel diameter can be obtained through multiple resections.

[0009] In addition, the resection device according to the present application can further have the following additional technical features.

[0010] In some embodiments of the present application, the bending connector is fixedly connected with the first bending point and movably connected with the second bending point, the distance between the first bending point and the distal end of the catheter is smaller than the distance between the second bending point and the distal end of the catheter, and the first bending point is arranged on the other side relative to the second bending point.

[0011] In some embodiments of the present application, the bending connector comprises a bending control wire, the catheter is provided with a control wire lumen for the bending control wire to pass through, the second bending point is arranged at the distal end of the control wire lumen, the bending control wire passes through the second bending point and is fixedly connected with the first bending point after rotating around the catheter.

[0012] In some embodiments of the present application, the control assembly comprises a control seat arranged on the handle body and a take-up device movably connected with the control seat, the take-up device is connected with the bending control wire and used for pulling the bending control wire to adjust the posture of the catheter.

[0013] In some embodiments of the present application, the catheter is provided with a torque shaft connected with the cutter head assembly, and the handle body is provided with a driving mechanism used for driving the torque shaft to rotate.

[0014] In some embodiments of the present application, the cutter head assembly comprises a limiting seat connected with the catheter and a rotary cutter head arranged on the limiting seat, the rotary cutter head is fixedly connected with one end of the torque shaft, the torque shaft drives the rotary cutter head to rotate and connect with the limiting seat, and the limiting seat is provided with a protective sleeve covering the side surface of the rotary cutter head.

[0015] In some embodiments of the present application, the catheter comprises an inner tube and an outer tube arranged outside the inner tube, the inner tube covers the outside of the torque shaft, the torque shaft is in clearance fit with the inner tube, and a braided layer is arranged between the inner tube and the outer tube.

[0016] In some embodiments of the present application, the handle body is provided with a discharge lumen connected with the catheter, and the discharge lumen is communicated with the outside space of the catheter and the handle body.

[0017] In some embodiments of the present application, the torque shaft passes through the discharge lumen and is connected with the driving mechanism, the driving mechanism comprises a power source, a driving transmission assembly used for connecting the power source and the torque shaft, and a power supply electrically connected with the power source.

[0018] In some embodiments of the present application, the discharge channel comprises a main cavity connected to the catheter and a waste tube arranged on the side of the main cavity, and the torque shaft passes through the. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 Structure diagram of the cutting device in the embodiment one of the present application;

[0020] Figure 2 Structure diagram of the internal structure of the handle body in the embodiment one of the present application;

[0021] Figure 3 Structure diagram of the driving transmission assembly in the embodiment one of the present application;

[0022] Figure 4 Structure diagram of the cutting head assembly in the embodiment one of the present application;

[0023] Figure 5 Structure diagram of the catheter in the embodiment one of the present application;

[0024] Figure 6 Structure diagram of the bending assembly in the embodiment one of the present application;

[0025] Figure 7 Structure diagram of the bent catheter in the embodiment one of the present application;

[0026] Figure 8 Structure diagram of the control assembly in the embodiment one of the present application;

[0027] Figure 9 Sectional view of the control assembly in the embodiment one of the present application;

[0028] Figure 10 Side view of the sectional view of the control assembly in the embodiment one of the present application;

[0029] Figure 11 Structure diagram of the adjustment module in the low-speed cutting in the embodiment one of the present application;

[0030] Figure 12 Structure diagram of the adjustment module in the high-speed cutting in the embodiment one of the present application;

[0031] Figure 13 Structure diagram of the adjustment module in the low-speed cutting in the embodiment one of the present application;

[0032] Figure 14 Structure diagram of the adjustment module in the high-speed cutting in the embodiment one of the present application;

[0033] Figure 15 is the structural diagram of the speed regulating key in embodiment one of the present application;

[0034] Figure 16 is the overall structural diagram of the disassembled connecting part in embodiment one of the present application;

[0035] Figure 17 is the exploded view of the handle body in embodiment one of the present application;

[0036] Figure 18 is the partial structural diagram of the clamping assembly in embodiment one of the present application;

[0037] Figure 19 is the connection structure diagram of the handle body and the handle upper cover in embodiment one of the present application;

[0038] Figure 20 is the connection structure diagram of the handle body and the driving mechanism in embodiment one of the present application;

[0039] Figure 21 is the partial structural diagram of the clamping assembly in embodiment one of the present application;

[0040] Figure 22 is the structural diagram of the guide pipe and the bending assembly in embodiment two of the present application;

[0041] Figure 23 is the overall structural diagram of the handle body in embodiment three of the present application;

[0042] Figure 24 is the internal structural diagram of the control assembly in embodiment three of the present application;

[0043] Figure 25 is the overall structural diagram of the handle body in embodiment four of the present application;

[0044] Figure 26 is the internal structural diagram of the control assembly in embodiment four of the present application;

[0045] Figure 27 is the partial structural diagram of the control assembly in embodiment four of the present application;

[0046] Figure 28 is the three-dimensional structural diagram of the handle body in embodiment five of the present application;

[0047] Figure 29 is the internal structural diagram of the handle body in embodiment five of the present application;

[0048] Figure 30 is the exploded view of the handle body in embodiment five of the present application;

[0049] Figure 31 is a partial structural schematic view of a catheter in Example Five of the present application;

[0050] Figure 32 is a partial structural schematic view of a catheter in Example Five of the present application; Figure 29 is a close-up view of area A of

[0051] Figure 33 is a close-up view of area B of Figure 29 is a close-up view of area B of DETAILED DESCRIPTION

[0052] Example embodiments of the present application will now be described in detail with reference to the accompanying drawings. Although example embodiments of the present application are shown in the drawings, it should be understood that the present application can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art.

[0053] It should be understood that the terms used herein are for the purpose of describing particular example embodiments and are not intended to be limiting. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises" and / or "comprising," and / or "includes" and / or "including" and / or "has" and / or "having" when used herein, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order in which they are described, unless specifically identified as an order dependent step. It is also to be understood that additional or alternative steps can be employed.

[0054] Although the terms first, second, third, and the like can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can be only used to differentiate one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, these terms are used merely as labels to material elements unlike a numerical terminology of a claim.

[0055] For the purposes of the description, relative terms of orientation such as "inner", "outer", "inwardly", "outwardly", "lower", "bottom", "upper", "top", etc. can be used to describe the orientation of one element or feature relative to another element or feature as shown in the figures. Such relative terms of orientation are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, the element described as "below" or "under" the other element or feature would then be oriented "above" or "over" the other element or feature. Thus, the example term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative terms used herein interpreted accordingly.

[0056] For the purposes of the description, the terms "proximal" and "distal" are used herein to describe the relative positions of one element or feature to another, where "proximal" refers to the position closer to the operator and "distal" refers to the position further from the operator, and the phrase "axial direction" is understood to mean the direction in which the interventional element is advanced and withdrawn, and the direction perpendicular to the "axial direction" is defined as the "radial direction".

[0057] Embodiment One

[0058] Embodiment One of the present application proposes a resection device, as shown in the accompanying drawings, comprising a handle body 100, a catheter 200 connected to the handle body 100, and a cutter head assembly 300 arranged at the distal end of the catheter 200, wherein a torque shaft 210 connected to the cutter head assembly 300 is arranged in the catheter 200. Figures 1 to 3 As shown in the accompanying drawings, a bending assembly 220 for bending the distal end of the catheter 200 is arranged on the catheter 200, and a driving mechanism 400 detachably connected to the handle body 100 is arranged on the handle body 100. Figure 5 As shown in the accompanying drawings, a bending assembly 220 for bending the distal end of the catheter 200 is arranged on the catheter 200, and a driving mechanism 400 detachably connected to the handle body 100 is arranged on the handle body 100. Figure 11 As shown in the accompanying drawings, the driving mechanism 400 comprises a driving module 410 for driving the torque shaft 210 to rotate, and an adjusting module 420 for controlling the driving module 410 to adjust the torque of the torque shaft 210.

[0059] The present application adjusts the bending radius of the distal catheter 200 through the bending adjusting assembly 220, offsets the catheter 200 towards the predetermined direction, controls the orientation of the cutter head assembly 300, reduces the risk of scratching the blood vessel and blood vessel perforation, and can obtain the ideal blood vessel diameter through multiple resections; meanwhile, the adjusting module 420 for adjusting the torque of the torque shaft 210 is arranged, so that the plaque resection device can be adjusted to make the plaque resection more smooth when resecting hard plaques; on the other hand, the driving mechanism 400 detachably connected to the handle body 100 is arranged, so that the driving mechanism 400 can be recycled, thereby reducing the use cost of the plaque resection device.

[0060] Specifically, as shown in Figure 4 The cutter head assembly 300 includes a limiting seat 310 connected to the catheter 200 and a rotary cutter head 320 arranged on the limiting seat 310, the rotary cutter head 320 is fixedly connected to one end of the torque shaft 210, the torque shaft 210 drives the rotary cutter head 320 to rotate and connect to the limiting seat 310, and the limiting seat 310 is provided with a protective sleeve 330 covering the side surface of the rotary cutter head 320.

[0061] As shown in Figure 5 The catheter 200 includes an inner tube 230 and an outer tube 240 arranged outside the inner tube 230, the inner tube 230 is sleeved outside the torque shaft 210, the torque shaft 210 is gap-fitted with the inner tube 230, and the torque shaft 210 penetrates the entire inner cavity of the inner tube 230.

[0062] Further, a braided layer 250 is arranged between the inner tube 230 and the outer tube 240, wherein the braided layer 250 is specifically a braided mesh formed by braiding nickel-titanium wire. The inner tube 230 and the outer tube 240 are connected through the braided layer 250, thereby enhancing the toughness of the catheter 200, when the catheter 200 penetrates into a branch blood vessel or passes through a curved part of the blood vessel, the catheter 200 will not appear local concave bending phenomenon, which can ensure the integrity of the catheter 200 lumen, and ensure the passability of the resected plaque, so that the plaque will not be blocked at the bending part of the catheter 200.

[0063] Specifically, the rotary cutter head 320 is fixed on the end of the torque shaft 210 by welding, and the torque shaft 210 rotates to drive the rotary cutter head 320 to rotate. The rotary cutter head 320 is provided with a cutter head clamping groove 321, the distal end of the limiting seat 310 is provided with a limiting boss 311, the limiting boss 311 is clamped and matched with the cutter head clamping groove 321, thereby realizing the axial and radial limiting between the rotary cutter head 320 and the limiting seat 310.

[0064] The spin cutting tool bit 320, the limiting seat 310 and the protective sleeve 330 are all made of stainless steel. Meanwhile, the distal end of the limiting seat 310 is provided with an elastic sheet 312, and the limiting boss 311 is arranged on the elastic sheet 312. Since the whole tool bit assembly 300 is made of hard metal material, the assembly process of the spin cutting tool bit 320 and the limiting seat 310 is complex. In the embodiment, the elastic sheet 312 is arranged at the distal end of the limiting seat 310, and the elastic sheet 312 is elastic and can be elastically deformed during assembly, so that the limiting boss 311 is smoothly clamped into the tool bit clamping groove 321. The protective sleeve 330 covers the outside of the limiting seat 310, and the protective sleeve 330 tightly abuts the outer surface of the limiting seat 310. Therefore, after the assembly of the protective sleeve 330 is completed, the elastic sheet 312 is limited between the spin cutting tool bit 320 and the protective sleeve 310, so that the clamping and cooperation of the limiting boss 312 and the tool bit clamping groove 321 is completed, and the axial and radial limiting between the spin cutting tool bit 320 and the limiting seat 310 is realized.

[0065] The catheter 200 comprises, from inside to outside, an inner tube 230, a braided layer 250 and an outer tube 240, and the inner tube 230, the braided layer 250 and the outer tube 240 are formed into one whole body by heat melting. Further, the distal end of the catheter 200 is provided with a spring tube 260, the spring tube 260 is sleeved outside the braided layer 250, or the braided layer 250 is sleeved outside the spring tube 260, and the spring tube 260 is axially fixed with the braided layer 250 by welding. In the embodiment, the spring tube 260 is sleeved outside the braided layer 250. By arranging the spring tube 260 at the distal end of the catheter 200, the compliance and resilience of the distal end of the catheter 200 are enhanced. In other embodiments, the spring tube 260 can also be embedded in the outer tube 240.

[0066] In the application, the braided layer 250 has good bending resistance, and the spring tube 260 has good torque resistance. Therefore, the catheter 200 is provided with the braided layer 250, and the structure of arranging the spring tube 260 at the distal end of the catheter 200 can make the distal end of the catheter 200 have both bending resistance and torque resistance. When the catheter 200 is bent, the cooperation of the braided layer 250 and the spring tube 260 can avoid local concave deformation of the catheter 200 due to bending, can maintain the deformation of the lumen of the catheter 200 in the case of bending of the catheter 200, and can ensure that the gap between the catheter 200 and the torque shaft 210 is sufficient to pass through plaque or thrombus, so as to ensure smooth operation. Meanwhile, the catheter 200 can also have good blood vessel passing performance, so that the catheter 200 can enter the relatively complex curved blood vessel more smoothly.

[0067] The protective sleeve 330 and the outer tube 240 are fixed by heat melting, the outer tube 240 is a TPU tube or a Pebax tube, and in the embodiment, the outer tube 240 is made of Pebax material.

[0068] Wherein, in combination Figure 2 The catheter 200 is connected to the handle body 100 through a buffer sleeve 270, the buffer sleeve 270 is connected to the handle body 100 through a snap-fit manner, the buffer sleeve 270 is made of TPU or other rubber or plastic materials. The buffer sleeve 270 is made of soft material, which can eliminate the vibration of the catheter 200 during the rotation cutting, and the vibration transmitted to the handle body 100 will be significantly reduced, thereby providing conditions for the fine operation of the operator.

[0069] Further, in combination Figure 11 And Figure 12 As shown, the drive mechanism 400 further includes a drive housing 430, a power source 411, and a drive transmission assembly 412 for connecting the power source 411 and the torque shaft 210. The adjustment module 420 includes an adjustment transmission assembly 421 connected to the drive transmission assembly 412 and a shift assembly 422 for controlling the cooperation between the adjustment transmission assembly 421 and the drive transmission assembly 412 to adjust the torque of the torque shaft 210. The drive housing 430 is provided with a power supply assembly 413 for driving the power source 411.

[0070] Specifically, the power source 411 is a motor arranged in the drive housing 430, and the power supply assembly 413 is a battery arranged in the drive housing 430, and the battery is electrically connected to the motor. The power supply assembly 413 supplies power to the power source 411, and the power source 411 drives the torque shaft 210 to rotate through the drive transmission assembly 412, and the torque shaft 210 rotates to drive the rotary cutting head 320 arranged at the distal end to rotate, thereby cutting the plaque in the blood vessel. The handle body 100 is further provided with a switch 160 for controlling the working state of the motor.

[0071] In other embodiments, a power supply assembly 413 for connecting an external power source and electrically connected to the power source 411 can also be arranged on the drive housing 430. That is, when the power source 411 needs to be driven to work, the external power source is connected through the power supply assembly 413, and the power supply assembly 413 includes a power supply socket arranged on the drive housing 430. By arranging the power supply socket, the difficulty and cost of sterilization and disinfection of the handle body 100 and the internal components can be reduced, and the weight and transportation difficulty of the whole machine can be reduced.

[0072] Further, in combination Figure 2As shown, the handle body 100 is provided with an exhaust channel 500 connected to the catheter 200, the exhaust channel 500 is communicated with the catheter 200 and the outside space of the handle body 100, and the torque shaft 210 passes through the exhaust channel 500 and is connected to the driving mechanism 400. The exhaust channel 500 includes a main cavity 510 communicated with the catheter 200 and a waste pipe 520 arranged on the side of the main cavity 510, the torque shaft 210 passes through the main cavity 510 and is communicated with the outside space of the handle body 100, and a guide wire cavity 211 is arranged in the torque shaft 210.

[0073] Specifically, the torque shaft 210 is arranged in a spiral shape. When the plaque removal device works, the motor drives the torque shaft 210 to rotate, and since the torque shaft 210 is arranged in a spiral shape, the torque shaft 210 can carry the plaque tissue out of the catheter 200 during rotation.

[0074] The guide wire cavity 211 in the torque shaft 210 is used to pass through the guide wire, and the guide wire is used to extend into the blood vessel or branch blood vessel before the catheter 200 extends into the blood vessel or moves, so as to establish a path for the catheter 200 to move along the path established by the guide wire.

[0075] The proximal end of the outer tube 240 is adhesively fixed to the main cavity 510, and the plaque tissue removed by the rotary cutter head 320 is discharged from the catheter 200 into the exhaust channel 500 through the gap between the torque shaft 210 and the inner tube 230 along with the rotation of the torque shaft 210, the main cavity 510 of the exhaust channel 500 temporarily contains the removed plaque tissue, and finally discharges the plaque tissue through the waste pipe 520. The waste pipe 520 is arranged at the proximal end of the main cavity 510 and is arranged inclinedly along the direction of plaque removal, so as to facilitate the discharge of the plaque.

[0076] In this embodiment, as shown, Figures 5 to 7 The handle body 100 is provided with a control assembly 140 for controlling the bending assembly 220, the bending assembly 220 includes at least two bending points 221 and a bending connecting piece 222 for connecting the bending points 221. In combination with Figure 3 As shown, the control assembly 140 includes a control seat 141 arranged on the handle body 100 and a take-up device 142 movably connected to the control seat 141, the take-up device 142 is used to connect the bending connecting piece 222 and to pull the bending connecting piece 222 to adjust the posture of the catheter 200.

[0077] The bending point 221 comprises a first bending point 2213 and a second bending point 2214 arranged on the catheter 200, the bending connector 222 is fixedly connected with the first bending point 2213, the bending connector 222 is movably connected with the second bending point 2214, the distance between the first bending point 2213 and the distal end of the catheter 200 is smaller than the distance between the second bending point 2214 and the distal end of the catheter 200, and the first bending point 2213 is arranged on the other side relative to the second bending point 2214.

[0078] The bending connector 222 comprises a bending control line 2225, the catheter 200 is provided with a control line cavity 2226 for the bending control line 2225 to pass through, the second bending point 2214 is arranged at the distal end of the control line cavity 2226, the bending control line 2225 passes through the second bending point 2214 and is fixedly connected to the first bending point 2213 after rotating around the catheter 200. In this embodiment, in order to make the orientation of the blade head assembly 300 the same as the catheter 200, the first bending point 2213 and the second bending point 2214 are arranged at a circumferential difference of 180 degrees.

[0079] Specifically, the control line cavity 2226 is arranged in the catheter 200, and the control line cavity 2226 can be arranged inside the outer tube 240 or inside the inner tube 230. The first bending point 2213 is a fixed point fixedly arranged on the woven layer 250 and fixedly connected with the bending control line 2225, and the second bending point 2214 is an end point at the distal end of the control line cavity 2226.

[0080] In this embodiment, the first bending point 2213 is a fixed ring welded on the woven layer 250, the fixed ring tightly fixes the bending control line 2225 on the woven layer 250, or the bending control line 2225 is welded with the fixed ring. By arranging the first bending point 2213 as a ring, the multi-phase connection of the bending control line 2225 is met, and the angle adjustment and fixation of the bending control line are facilitated.

[0081] One end of the bending control line 2225 is connected to the take-up device 142, and the other end of the bending control line 2225 first passes out of the control line cavity 2226, then spirally rotates 180 degrees along the gap between the inner tube 230 and the woven layer 250, and is fixed on the first bending point 2213. The rotation angle of the bending control line 2225 can also be 170 degrees or 190 degrees, as long as the second bending point 2214 is arranged on the opposite side of the first bending point 2213, so that the orientation of the blade head assembly 300 is substantially the same as that of the catheter 200 after bending.

[0082] Further, the axial length of the spiral portion of the bending control wire 2225 extending out of the second bending point 2214 and fixed between the first bending point 2213 is set to 1 to 3 times the outer diameter of the outer tube 240. If the axial length between the first bending point 2213 and the second bending point 2214 is too long, the bending effect will be poor. If the axial length between the first bending point 2213 and the second bending point 2214 is too short, the stress required for bending will be too large, which is not conducive to operation. Therefore, in this embodiment, the axial length of the spiral portion of the bending control wire 2225 extending out of the second bending point 2214 and fixed between the first bending point 2213 is set to 2 times the outer diameter of the outer tube 240.

[0083] Further, by adjusting the take-up device 142, the movement of the bending control wire 2225 in the control wire cavity 2226 or the inner tube 230 is controlled. Since the bending control wire 2225 is helically rotated by 180 degrees along the inner tube 230 at the distal end of the catheter 200, when the bending control wire 2225 is controlled to contract, the bending control wire 2225 has both axial force and radial force on the distal end of the catheter 200, thereby controlling the axial and radial displacement of the cutter head assembly 300, so that the cutter head assembly 300 realizes S-shaped bending. Since the bending control wire 2225 is rotated by 180 degrees, the cutter head assembly 300 can be kept in the same direction as the catheter 200 axially, reducing the risk of scratching the blood vessel wall by the cutter head assembly 300. The cutter head assembly 300 can cut the plaque in the blood vessel before and after bending, so that the blood vessel can obtain a larger lumen.

[0084] As shown in Figures 8 to 10 The control assembly of this embodiment includes a control seat arranged on the handle body and a take-up device movably connected to the control seat. The take-up device includes a locking member 1421 for self-locking.

[0085] The handle body 100 is provided with a control groove 150, and the control assembly 140 is arranged in the control groove 150. One end of the control groove 150 is provided with a top rod 151, and the control seat 141 is provided with a top groove 1411 at the end facing the top rod 151. The other end of the control seat 141 is rotatably connected to the other end of the control groove 150. Thus, the control seat 141 is axially fixed in the control groove 150 through the cooperation of the top groove 1411 and the top rod 151, and the control seat 141 can be rotatably connected to the handle body 100 through the cooperation of the top groove 1411 and the top rod 151.

[0086] The take-up device 142 is arranged in the control seat 141, and a clamping portion 143 for clamping the bending control line 2225 is arranged on the take-up device 142. The locking member 1421 is an internal thread arranged on the inner wall of the control seat 141 and an external thread arranged on the outer wall of the take-up device 142, the take-up device 142 is connected with the control seat 141 through the threads, and the internal thread on the control seat and the external thread on the take-up device are self-locking thread cooperation. After the doctor loosens the take-up device, the take-up device will not move relative to the control seat due to the relative self-locking of the internal thread and the external thread, thereby realizing self-locking of the take-up device.

[0087] The control seat 141 is provided with a sliding rod 144 arranged in the axial direction of the control seat 141, the take-up device 142 is slidingly connected to the sliding rod 144, and a rotation limiting surface 1441 is arranged between the sliding rod 144 and the take-up device 142, so that the take-up device 142 can translate along the length direction of the sliding rod 144 and cannot rotate relative to the sliding rod 144, that is, a screw rod linkage relationship is formed.

[0088] Therefore, when the control seat 141 is rotated, the take-up device 142 can slide on the sliding rod 144 and move relative to the control seat 141 under the linkage of the thread cooperation, and the take-up device 142 clamps the bending control line 2225, the bending control line 2225 moves relative to the handle body 100 along with the take-up device 142, thereby controlling the bending action of the catheter 200.

[0089] In further embodiments of the present application, as shown in Figures 11 to 15 The drive transmission assembly 412 includes a first transmission member 4121 connected with the torque shaft 210, a second transmission member 4122 connected with the power source 411, and a third transmission member 4123 arranged on the drive housing 430, the third transmission member 4123 is connected between the first transmission member 4121 and the second transmission member 4122.

[0090] As shown in Figure 13 The adjustment transmission assembly 421 includes a fourth transmission member 4211 coaxially arranged with the second transmission member 4122 and a fifth transmission member 4212 coaxially arranged with the third transmission member 4123, the gear shifting assembly 422 includes a driving shaft 4221 connected with the output shaft of the power source 411 and a shift lever 4222 connected with the driving shaft 4221, the third transmission member 4123 and the fifth transmission member 4212 are both arranged on the driving shaft 4221, the driving shaft 4221 is slidingly connected with the output shaft and rotates synchronously; the shift lever 4222 is used to drive the second transmission member 4122 to connect with the third transmission member 4123 or to drive the fourth transmission member 4211 to connect with the fifth transmission member 4212.

[0091] Specifically, the transmission members of the embodiment are all gears. The power source 411 is an electric motor, the first transmission member 4121 is an output gear connected to the torque shaft 210, the second transmission member 4122 is a driving gear connected to the electric motor, and the third transmission member 4123 is a transmission gear arranged on the driving housing 430. The driving gear, the transmission gear and the output gear are connected in meshing sequence.

[0092] In addition, the adjusting transmission assembly 421 of the embodiment is provided with a second set of gear assemblies, i.e. the fourth transmission member 4211 and the fifth transmission member 4212. The fourth transmission member 4211 is a large speed regulating gear coaxially arranged with the second transmission member 4122, and the fifth transmission member 4212 is a small speed regulating gear coaxially arranged with the third transmission member 4123.

[0093] Specifically, the fourth transmission member 4211 is arranged on the driving wheel shaft 4221 together with the second transmission member 4122, the electric motor directly drives the output shaft to rotate, the driving wheel shaft 4221 is slidingly connected to the output shaft of the electric motor and synchronously rotates with the output shaft of the electric motor. The fifth transmission member 4212 is connected to the third transmission member 4123 through the driven wheel shaft 4224, and the fifth transmission member 4212 and the third transmission member 4123 synchronously rotate through the driven wheel shaft 4224.

[0094] The driving wheel shaft 4221 is fixedly connected with the lever 4222, the end of the lever 4222 is provided with a speed regulating key 4223, and the speed regulating key 4223 is slidingly connected to the handle body 100. As shown in Figure 15 The driving housing 430 is provided with a low speed limiting groove 4113 and a high speed limiting groove 4113, when the rotary cutting tool bit 320 is in low speed cutting, the speed regulating key 4223 is located in the low speed limiting groove 4113, and the second transmission member 4122, the third transmission member 4123 and the first transmission member 4121 are connected in meshing sequence.

[0095] The working principle of the driving module 410 of the embodiment is as follows: when the power source 411 works and drives the second transmission member 4122 to rotate, i.e. the electric motor starts to operate and drives the second transmission member 4122 to operate. The second transmission member 4122 transmits the rotating speed to the third transmission member 4123 through meshing, the third transmission member 4123 transmits the speed to the first transmission member 4121 through meshing, and the first transmission member 4121 transmits the speed to the torque shaft 210, the torque shaft 210 drives the rotary cutting tool bit 320 to rotate, and the low speed cutting is completed. When the low speed cutting is performed, the rotating speed of the torque shaft is relatively low, and the torque is relatively large.

[0096] When the high and low gear is switched, the speed regulating key 4223 is toggled to move the speed regulating key 4223 to the high speed limit slot 4113, and the toggle lever 4222 is driven to move along with the speed regulating key 4223, and the movement of the speed regulating lever drives the driving shaft 4221 to move and disengage the second transmission member 4122 from the third transmission member 4123. Since the fourth transmission member 4211 and the second transmission member 4122 are both arranged on the driving shaft 4221, the fourth transmission member 4211 also moves along with the driving shaft 4221 and engages with the fifth transmission member 4212, completing the switching of the gear engagement relationship.

[0097] In the present embodiment, the number of teeth of the fourth transmission member 4211 is greater than the number of teeth of the second transmission member 4122, and the number of teeth of the fifth transmission member 4212 is less than the number of teeth of the third transmission member 4123. Therefore, compared with the transmission state of the second transmission member 4122 and the driven gear, the rotation speed of the fifth transmission member 4212 is higher when the fourth transmission member 4211 and the fifth transmission member 4212 are engaged.

[0098] Since the rotation speed of the fifth transmission member 4212 is higher, and the fifth transmission member 4212 transmits the higher rotation speed to the third transmission member 4123 through the driven shaft 4224, the third transmission member 4123 engages with the first transmission member 4121, so that the rotation speed of the first transmission member 4121 is higher, completing the high-speed cutting of the rotary cutting head 320. When the high-speed cutting is performed, the rotation speed of the torque shaft is higher, and the torque is smaller.

[0099] Based on the above scheme of the present embodiment, by arranging additional gear sets, i.e., the fourth transmission member 4211 and the fifth transmission member 4212, in the adjusting module 420, and adjusting the engagement relationship between each gear assembly through the gear shifting assembly 422, the rotation speed of the rotary cutting head 320 is adjusted in high-speed and low-speed gears, and the torque of the rotary cutting head 320 is adjusted in high-torque and low-torque. Doctors can choose the cutting speed flexibly according to the texture of the plaque, avoid the phenomenon of the cutter head being stuck, improve the stability of use, and avoid blood vessel damage.

[0100] In the conventional cutting, doctors can choose the high-speed gear to maximize the plaque removal efficiency. When the plaque is blocked or difficult to remove, especially when the plaque or thrombus is stuck in the curved part of the catheter 200 due to the bending of the catheter 200, doctors can choose the low-speed gear to increase the torque of the torque shaft 210, avoid the plaque or thrombus from passing through the curved part of the catheter 200, ensure that the catheter 200 will not be blocked, and avoid the situation that the rotary cutting head 320 is stuck, ensuring the smooth progress of the operation.

[0101] In other embodiments, additional gear assemblies can also be provided to increase the number of adjustable gears, for example, to achieve three-gear adjustment, thereby providing more options for doctors. Moreover, the above-mentioned speed adjustment scheme is only an example, and any mechanical structure that can achieve torque shaft torque adjustment is within the scope of the present application.

[0102] In other embodiments, when using an external power supply driving mode, the output torque of the torque shaft can also be dynamically controlled by dynamically adjusting the output power of the external power supply, thereby ensuring the stability of use.

[0103] Further, as shown in Figures 16 to 21 The handle body 100 is provided with an assembly part 110 for assembling the driving mechanism 400, and the driving mechanism 400 includes a driving housing 430 for accommodating the driving module 410 and the adjustment module 420. A disassembly connection part 130 is provided between the driving housing 430 and the assembly part 110. The driving transmission assembly 412 is provided with a sealing structure 4124 between the driving transmission assembly 412 and the handle body 100.

[0104] The dismountable design of the driving mechanism 400 first provides convenience for early sterilization, and the power supply assembly 413, which is difficult to sterilize, in the driving mechanism 400 can be sterilized separately. Then, through the disassembly connection part 130, rapid assembly is realized, the sterilization difficulty of the whole resection device is reduced, the production and assembly speed is reduced, and the production efficiency is improved. Secondly, after the use of the resection device, the disassembled parts can be used again within the allowable range of medical specifications, improving the utilization rate of parts and reducing the use cost. In addition, after the use of the resection device is completed, each part can be quickly disassembled, and flexible classification recycling and scrapping according to medical specifications can be realized, thereby reducing the recycling difficulty and cost.

[0105] The disassembly connection part 130 includes a hooking assembly 131 and a clamping assembly 132 provided between the assembly part 110 and the driving housing 430. The hooking assembly 131 and the clamping assembly 132 are respectively provided at both ends of the assembly part 110. A pop-up piece 133 is provided between the driving housing 430 and the bottom of the assembly part 110.

[0106] Specifically, the assembly part 110 is an assembly groove provided on the handle body 100 for mounting the driving mechanism 400. The driving mechanism 400 is arranged in the assembly part 110, and the driving mechanism 400 is dismountably connected to the handle body 100. The driving mechanism 400 is dismountably connected to the assembly part 110 through the driving housing 430, so that the driving mechanism 400 can be dismounted and replaced as a whole. The driving module 410 and the adjustment module 420 are both mounted in the driving housing 430.

[0107] The embodiment sets the driving mechanism 400 as a detachable structure as a whole, so that the driving mechanism 400 can be recycled under the condition of meeting the standard. Moreover, the driving mechanism 400 and the handle body 100 can be classified and recycled according to the medical use standard.

[0108] Further, as shown in Figure 18 The engagement assembly 132 is arranged at the proximal end of the handle body 100, and the hooking assembly 131 is arranged at the distal end of the handle body 100. The engagement assembly 132 comprises a locking pin 1321 slidingly connected to the driving shell 430 and a locking key 1322 arranged on the locking pin 1321. The locking key 1322 is integrally formed with the locking pin 1321, or the locking pin 1321 and the locking key 1322 are separately formed and then adhesively fixed.

[0109] The inner wall of the assembly part 110 is provided with a locking hole 1323 for engagement connection with the locking pin 1321. The user can move the locking pin 1321 by rotating the locking key 1322, and control the locking pin 1321 to be inserted into the locking hole 1323 to realize the fixation of the locking pin 1321 and the locking hole 1323, or control the locking pin 1321 to be separated from the locking hole 1323 to realize the separation of the locking pin 1321 and the locking hole 1323. When the locking pin 1321 is inserted into the locking hole 1323, the driving mechanism 400 and the assembly part 110 are in a fixed state, and when the locking pin 1321 is separated from the locking hole 1323, the driving mechanism 400 and the assembly part 110 are in a separated state.

[0110] The bottom of the locking key 1322 is provided with a locking clamping piece 1324, and the surface of the driving shell 430 is provided with a locking fixed groove 1325 and a separation fixed groove 1326. The separation fixed groove 1326 is arranged away from the locking hole 1323 relative to the locking fixed groove 1325, and the locking fixed groove 1325 and the separation fixed groove 1326 are respectively used for engagement fixation with the locking clamping piece 1324. When the locking key 1322 drives the locking pin 1321 to move towards the direction close to the locking hole 1323, and the locking clamping piece 1324 is engaged and connected in the locking fixed groove 1325, the locking pin 1321 is inserted into the locking hole 1323, and the driving mechanism 400 and the assembly part 110 are engaged and fixed. When the locking key 1322 drives the locking pin 1321 to move away from the direction close to the locking hole 1323, and the locking clamping piece 1324 is engaged and connected in the separation fixed groove 1326, the locking pin 1321 is separated from the locking hole 1323, and the driving mechanism 400 and the assembly part 110 are separated.

[0111] The driving housing 430 is provided with a spring 133 between the bottom of the assembly part 110 and the driving housing 430, which is used to pop out the driving mechanism 400. That is, when the locking pin 1321 is separated from the locking hole 1323, the spring 133 automatically pops out the driving mechanism 400 from the assembly part 110, so as to facilitate the user to take out the driving mechanism 400.

[0112] The hooking assembly 131 is arranged at the other end of the driving housing 430 relative to the locking pin 1321, and the hooking assembly 131 comprises a hook 1311 arranged on the distal end surface of the driving housing 430 and a hooking groove 1312 arranged on the inner surface of the assembly part 110 and connected with the hook 1311.

[0113] When the driving mechanism 400 is fixed in the assembly part 110, first, the hook 1311 is connected with the hooking groove 1312, so as to fix the distal end of the driving mechanism 400 with the assembly part 110, and then the locking key 1322 of the clamping assembly 132 is inserted into the locking hole 1323, so as to fix the distal end of the driving mechanism 400 with the assembly part 110.

[0114] When the driving mechanism 400 is taken out from the assembly part 110, first, the locking key 1322 of the clamping assembly 132 is separated from the locking hole 1323, so as to separate the proximal end of the driving mechanism 400 from the assembly part 110, and then the hook 1311 is taken out from the hooking groove 1312, so as to separate the distal end of the driving mechanism 400 from the assembly part 110.

[0115] In the embodiment, the handle upper cover 120 is detachably connected to the handle body 100 and arranged outside the driving mechanism 400.

[0116] As shown in the combination Figure 19 As shown in the combination, the distal end of the handle upper cover 120 is fixed with the hooking groove 1312 of the handle body 100 through the clamping structure, and the distal end of the handle upper cover 120 is provided with an upper cover pin 123, wherein the upper cover pin 123 is inserted into the hooking groove 1312. The proximal end of the handle upper cover 120 is provided with an insertion plate 121, which is arranged between the driving housing 430 and the hooking groove 1312, and the insertion plate 121 is provided with a hole 122 matched with the locking pin 1321. When the upper cover pin 123 of the handle upper cover 120 is clamped and fixed with the hooking groove 1312, the handle body 100 is arranged close to the driving housing 430, and then the locking key 1322 is moved towards the locking hole 1323. The locking key 1322 first passes through the hole 122 on the insertion plate 121, and then is inserted into the recessed hole, so as to achieve the purpose of fixing the handle upper cover 120 and the driving mechanism 400 on the handle body 100.

[0117] The application protects the driving mechanism 400 from damage due to external impact and the like by providing the handle cover 120 on the driving mechanism 400. In addition, after the handle body 100 and the driving mechanism 400 are disassembled, the relevant disassembled parts can be classified, recycled and scrapped according to relevant regulations.

[0118] In the embodiment, the bending assembly 220 is arranged at the distal end of the handle body 100, so as to facilitate the operation of the doctor during the operation. The catheter 200 penetrates into the handle body 100 from the distal end of the handle body 100. The catheter 200 is connected to the handle body 100 through the buffer sleeve 270. The proximal end of the catheter 200 is fixed to the discharge channel 500 arranged at the middle part of the handle body 100.

[0119] The discharge channel 500 is arranged at the middle part of the handle body 100. The torque shaft 210 penetrates the handle body 100. The torque shaft 210 first penetrates the catheter 200 and penetrates into the main cavity 510 from the catheter 200. The plaque or thrombus sent out from the catheter 200 falls into the main cavity 510 and is discharged from the waste discharge pipe. The waste discharge pipe is arranged obliquely relative to the main cavity 510, so as to facilitate the discharge of the plaque or thrombus.

[0120] The torque shaft 210 penetrates out of the discharge channel 500 and is connected to the handle body 100 through a bearing. The guide wire cavity 211 of the torque shaft 210 is communicated with the external space of the handle body 100. Therefore, the guide wire penetrates through the torque shaft 210 through the guide wire cavity 211 and penetrates out of the distal end of the torque shaft 210, so as to establish a path for the catheter 200 to enter the blood vessel.

[0121] The driving mechanism 400 is arranged above the catheter 200 and the discharge channel 500. The driving transmission assembly 412 is arranged at the proximal end of the discharge channel 500 and is connected to the torque shaft 210. Therefore, the plaque or thrombus is discharged out of the handle body 100 through the discharge channel 500 arranged at the distal end of the driving transmission assembly 412. The plaque or thrombus does not contact the driving transmission assembly 412.

[0122] The driving transmission assembly 412 and the discharge channel 500 are designed to be sealed. That is, the sealing structure 4124 is arranged between the first transmission member 4121 and the handle body 100. The sealing structure 4124 includes a rolling bearing fixed to the handle body 100 and a sealing ring for sealing the rolling bearing. The torque shaft 210 penetrates through the rolling bearing and is fixedly and sealingly connected to the rolling bearing. Specifically, the gap between the torque shaft 210 and the rolling bearing can be filled with solder and then welded and fixed. Then, the rolling bearing and the handle body 100 are sealed by the sealing ring. Therefore, the driving mechanism 400 of the embodiment can be kept clean after use, so as to facilitate recycling and secondary use.

[0123] In summary, the bending adjusting assembly 220 is used to adjust the bending radius of the distal catheter 200, to make the catheter 200 deviate towards the predetermined direction, and to control the orientation of the cutter head assembly 300, thereby reducing the risk of scratching the blood vessel and perforating the blood vessel, and enabling the ideal blood vessel diameter to be obtained through multiple resections. Meanwhile, the adjusting module 420 is arranged to adjust the torque of the torque shaft 210, so that the plaque resection device can be adjusted to make the plaque resection smoother when resecting hard plaques. On the other hand, the driving mechanism 400 is arranged to be detachably connected to the handle body 100, so that the driving mechanism 400 can be recycled, thereby reducing the use cost of the plaque resection device.

[0124] Embodiment two

[0125] Embodiment two of the present application provides a resection device, as shown in the drawings, Figure 22 The same parts of embodiment two and embodiment one are not described again, and the different parts of embodiment two and embodiment one are that the bending point 221 comprises a bending fixing member 2211 arranged on the catheter 200 and a return fixing member 2212 arranged on the cutter head assembly 300, the bending connecting member 222 is used to connect the bending fixing member 2211 and the return fixing member 2212, the return fixing member 2212 is arranged at the proximal end of the cutter head assembly 300, and the bending fixing member 2211 is arranged on the other side of the catheter 200 relative to the return fixing member 2212.

[0126] The bending connecting member 222 comprises a bending connecting line 2221 and a return connecting line 2222, and the catheter 200 is provided with a bending line cavity 2223 for the bending connecting line 2221 to pass through and a return line cavity 2224 for the return connecting line 2222 to pass through. The bending connecting line 2221 is used to connect the control assembly 140 and the bending fixing member 2211, and the return connecting line 2222 is used to connect the control assembly 140 and the return fixing member 2212.

[0127] The return fixing member 2212 is arranged at the proximal end of the cutter head assembly 300, and the bending fixing member 2211 is arranged on the other side of the catheter 200 relative to the return fixing member 2212. The bending fixing member 2211 is arranged on the other side of the catheter 200 relative to the return fixing member 2212, and preferably the bending fixing member 2211 and the return fixing member 2212 are arranged at a circumferential difference of 180 degrees.

[0128] Specifically, the catheter 200 is provided with a bending adjustment wire cavity 2223 and a reset wire cavity 2224, both of which are arranged in the outer tube 240 or between the outer tube 240 and the braided layer 250. One end of the bending adjustment connecting wire 2221 is connected to the bending adjustment fixing member 2211, then penetrates the bending adjustment wire cavity 2223, and the other end is connected to the control assembly 140. One end of the reset connecting wire 2222 is connected to the bending adjustment fixing member 2211, then penetrates the reset wire cavity 2224, and the other end is connected to the control assembly 140.

[0129] The bending adjustment connecting wire 2221 and the reset connecting wire 2222 are fixed on the wire collector 142. When the doctor rotates the control seat 141, the wire collector 142 slides on the slide rod 144 relative to the control seat 141, so as to simultaneously pull the bending adjustment connecting wire 2221 and the reset connecting wire 2222, thereby adjusting the posture of the catheter 200 and the blade head assembly 300.

[0130] The reset fixing member 2212 is a fixing plate arranged on the protective sleeve 330, and the reset connecting wire 2222 is welded and fixed with the fixing plate, or the reset fixing member 2212 is provided with a connecting hole, and the reset connecting wire 2222 penetrates through the connecting hole and is knot-fixed. The bending adjustment fixing member 2211 is a fixing ring arranged on the braided layer 250 of the catheter 200, which tightly fixes the bending adjustment connecting wire 2221 on the braided layer 250, or the bending adjustment connecting wire 2221 is welded and fixed with the fixing ring.

[0131] Since the bending adjustment fixing member 2211 is arranged on the other side of the catheter 200 relative to the reset fixing member 2212, when the wire collector 142 simultaneously pulls the bending adjustment connecting wire 2221 and the reset connecting wire 2222, the bending adjustment connecting wire 2221 controls the axial displacement of the catheter 200 through the bending adjustment fixing member 2211, and the reset fixing member 2212 controls the radial displacement of the blade head assembly 300 through the reset fixing member 2212. Under the combined action of the bending adjustment connecting wire 2221 and the reset connecting wire 2222, the blade head assembly 300 is bent in an S shape, so that the blade head assembly 300 and the catheter 200 are axially kept in the same direction, thereby reducing the risk of scratching the blood vessel wall by the blade head assembly 300. The blade head assembly 300 can cut off the plaque in the blood vessel before and after bending, so that the blood vessel can obtain a larger lumen.

[0132] The embodiment realizes the S-shaped bending of the catheter 200 and the cutter head assembly 300 through the bending assembly 220, so that the cutting area is increased by bending the catheter 200 and the cutter head assembly 300 when cutting the plaque in the blood vessel. Meanwhile, since the cutter head assembly 300 is basically in the same direction as the axial direction of the catheter 200 under the action of the return fixing part 2212, the cutter head assembly 300 will not mis-cut the blood vessel wall during the advancing process, thereby greatly reducing the risk of scratching the blood vessel wall by the cutter head assembly 300. Compared with the bending mode of the prior art, the application can not only obtain a larger lumen of the blood vessel, but also ensure the safety during cutting.

[0133] Embodiment three

[0134] Embodiment three of the application provides a cutting device, as shown in Figure 23 As shown in Figure 24 The same as embodiment one is not repeated, and the difference between embodiment three and embodiment one is that the handle body 100 is provided with a control groove 150, the control assembly 140 is arranged in the control groove 150, the control seat 141 is clamped and fixed in the control groove 150, the take-up device 142 includes a sliding knob 145 slidingly connected to the control seat 141 and a wiring point 1451 arranged on the sliding knob 145, and the wiring point 1451 is used for connecting the bending connecting part 222, and the bending connecting part 222 is a bending connecting wire 2221.

[0135] Specifically, the control seat 141 is provided with a sliding groove 1412 and a sliding block 1413 slidingly connected to the sliding groove 1412, and the sliding groove 1412 is arranged along the length direction of the control seat 141. The sliding block 1413 is provided with a fixing hole 1414, and the control seat 141 is provided with a fixing column 1452 at one end of the sliding knob 145 facing the sliding block 1413, and the fixing column 1452 passes through the fixing hole 1414, so that the sliding knob 145 is connected to the sliding block 1413 through the fixing column 1452. The control spring 146 is arranged between the sliding knob 145 and the sliding block 1413, the sliding knob 145 and the sliding block 1413 are simultaneously slidingly connected to the control seat 141, and the control spring 146 has an initial pressure, so that the sliding knob 145 is tightly attached to the inner wall of the control seat 141.

[0136] The locking part 1421 is a rough contact surface arranged between the sliding knob 145 and the control seat 141, when the control assembly 140 is in a natural state, the control spring 146 drives the sliding knob 145 to tightly attach to the inner wall of the control seat 141, since the rough contact surface is arranged between the sliding knob 145 and the control seat 141, the sliding knob 145 and the control seat 141 will not relatively move under the action of friction, so as to realize self-locking of the take-up device 142. When the sliding knob 145 is pressed into the control seat 141, the control spring 146 is compressed under force, and the sliding knob 145 is separated from the control seat 141, at this time, the sliding knob 145 can move relative to the control seat 141.

[0137] In other embodiments, the locking element 1421 may also be a protrusion and groove structure disposed between the slide button 145 and the control seat 141 and engaging with each other, to enhance the bonding strength of the slide button 145 and the control seat 141 when they are in contact. In the natural state, the control spring 146 drives the slide button 145 to press tightly against the inner wall of the control seat 141, thereby achieving self-locking of the retractor 142 through the engagement of the protrusion and groove structure.

[0138] In this embodiment, the slide button 145 is provided with a threaded hole, and the connection point 1451 is a screw threaded to the slide button 145. During assembly, the bending connector 222 is glued and fixed in the threaded hole, and then the screw is screwed into the threaded hole for secondary fixation.

[0139] In operation, the operator presses the sliding button 145 to separate it from the contact surface of the control seat 141. The spring slides the sliding button 145 along the axial direction of the guide tube 200, causing the bending connector 222 to move along the axial direction of the guide tube 200, thus adjusting the posture of the guide tube 200 and bending the blade assembly 300. During the surgery, the operator does not need to continuously press the sliding button 145, and can perform the bending operation of the blade assembly 300 with only one hand, reducing the operational burden and improving operational convenience. Furthermore, the precise adjustment stroke achieved through the translational adjustment method allows for precise control of the bending angle.

[0140] Example 4

[0141] Embodiment 4 of the present invention proposes a resection device, such as Figures 25 to 27 As shown, the similarities between Embodiment 4 and Embodiment 1 will not be repeated. The difference between Embodiment 4 and Embodiment 1 is that the handle body 100 is provided with a control groove 150, the control component 140 is disposed in the control groove 150, the control seat 141 is engaged and fixed in the control groove 150, and the retractor 142 includes a knob 147 rotatably connected to the control seat 141 and a locking member 1421 for engaging the knob. The locking member 1421 is a stop pin 148 for engaging and fixing the knob 147. The stop pin 148 is slidably connected to the control seat 141, and the knob 147 is provided with a stop groove 1472 that engages and connects with the stop pin 148. A stop spring 1481 is provided between the stop pin 148 and the inner wall of the control seat 141.

[0142] The knob 147 is provided with a rotating clamp block 1471, which is used to connect a bending adjusting connecting piece 222, which is a bending adjusting connecting wire 2221. The knob 147 is rotated to make the bending adjusting connecting piece 222 wind on the rotating clamp block 1471, so as to achieve the purpose of pulling the bending adjusting connecting piece 222 to adjust the posture of the catheter 200. In the natural state, the stop spring 1481 drives the stop pin to move towards the direction of the knob 147, and is clamped in the stop groove 1472. When it is needed to rotate the knob 147, the stop pin 148 is slid away from the knob 147, so that the stop pin 148 is separated from the stop groove 1472, and the knob 147 can be rotated at this time. When it is needed to lock the knob 147, the stop pin 148 is released, the stop spring 1481 drives the stop pin 148 to slide towards the direction close to the knob 147, so that the stop pin 148 is clamped with the stop groove 1472, and the knob 147 cannot be rotated at this time.

[0143] In further embodiments of the present application, the control assembly 140 further comprises a locking safety assembly 1422 for preventing accidental touch, which is arranged between the control seat 141 and the take-up device 142.

[0144] Specifically, the control seat 141 is further provided with a positioning column 1415, and a positioning spring 1416 is sleeved on the positioning column 1415, and the positioning spring 1416 is arranged between the control seat 141 and the knob 147. The knob 147 can move in the axial direction of itself, and the rotating clamp block 1471 and the control seat 141 are provided with a locking safety assembly 1422, which is a detent structure 149. The detent structure 149 comprises a detent groove 1491 arranged at one end of the rotating clamp block 1471 towards the knob 147, and a detent block 1492 arranged at one end of the control seat 141 towards the rotating clamp block 1471. When the detent block 1492 is clamped and fixed with the detent groove 1491, the knob 147 cannot be rotated.

[0145] In the natural state, the positioning spring 1416 pushes the knob 147 outward, so that the rotating clamping block 1471 is clamped and fixed with the clamping structure 149 between the control seat 141. At the same time, the stop pin 148 is in a clamped state with the stop groove 1472 under the driving of the stop spring 1481. When the stop pin 148 is inserted in the stop groove 1472, the stop pin 148 is located between the knob 147 and the control seat 141, blocking the path of the axial movement of the knob 147, so that the knob 147 cannot be pressed, and the clamping connection of the clamping block 1492 and the clamping groove 1491 cannot be released, so that the knob 147 cannot be rotated in the natural state. When the knob 147 needs to be rotated, the operator first slides the stop pin 148 away from the knob 147 to separate the stop pin 148 from the stop groove 1472, and then presses the knob 147 inward, so that the positioning spring 1416 is compressed under stress, and the clamping structure 149 is separated, that is, the clamping block 1492 and the clamping groove 1491 are separated, so that the knob 147 can be rotated.

[0146] Therefore, the control assembly 140 of the embodiment realizes double locking of the take-up device 142 by arranging an additional locking safety assembly 1422 between the control seat 141 and the take-up device 142, improves the reliability of the structure, and ensures that the posture of the cutter head assembly 300 does not change when the doctor pushes the cutter head assembly 300 to cut the plaque. Only when the doctor pushes the stop pin 148 and presses the knob 147 at the same time, the knob 147 can be rotated, so that the orientation of the cutter head assembly 300 does not change due to accidental touch, avoids cutting the blood vessel by the rotary cutter head 320, avoids the occurrence of medical accidents, and ensures the smooth progress of the operation.

[0147] Embodiment five

[0148] Embodiment five of the present application provides a resection device, as shown in Figures 29 to 33 The same as embodiment one is not repeated, and the difference between embodiment five and embodiment one is that the driving mechanism 400 is arranged in the handle body 100, and the catheter 200 is detachably connected with the driving mechanism 400.

[0149] Specifically, in combination with Figure 2 As shown in the figure, the driving mechanism 400 includes a driving module 410 arranged in the handle body 100, and the driving module 410 includes a power shaft 4111, a power source 411 and a power supply assembly 413. The power source 411 is used to drive the power shaft 4111 to rotate, and the catheter 200 is detachably connected to the power shaft 4111 through a connecting module 440. The power source 411 is a motor, which is used to drive the torque shaft 210 to rotate, and the power supply assembly 413 is a battery electrically connected to the motor.

[0150] In combination with Figures 31 to 33As shown, the proximal end of the torque shaft 210 is provided with a transmission shaft 212, the distal end of the power shaft 4111 is provided with a plug-in slot 4112, the transmission shaft 212 is plugged into the plug-in slot 4112 and rotates synchronously with the power shaft 4111. The transmission shaft 212 is provided with a clamping slot 2121, the connecting module 440 includes a clamping positioning assembly 441 clamped with the clamping slot 2121 and a clamping control assembly 442 for controlling the clamping positioning assembly 441.

[0151] In the embodiment, the torque shaft 210 specifically includes a shaft body 213 and a winding spring 214 arranged on the shaft body 213, wherein the winding spring 214 is spirally wound and fixed on the shaft body 213, can be fixed by welding, and the rotation direction of the winding spring 214 is opposite to the rotation direction of the shaft body 213. When the motor drives the torque shaft 210 to rotate, the winding spring 214 opposite to the rotation direction of the shaft body 213 can more quickly send the plaque in the catheter 200 out, improving the cutting efficiency.

[0152] Further, the transmission shaft 212 is provided with at least one limiting block 2122, and the inner wall of the plug-in slot 4112 is provided with a limiting slot 4113. After the transmission shaft 212 is plugged into the plug-in slot 4112, the limiting block 2122 is used to adapt to the limiting slot 4113 to fix the transmission shaft 212 in the circumferential direction of the power shaft 4111. In the embodiment, the transmission shaft 212 is provided with three circumferentially arrayed limiting blocks 2122, which are matched with the limiting slot 4113 in the form of plugging, and play a role in synchronizing the rotation of the power shaft 4111 and the transmission shaft 212 in the circumferential direction, so as to synchronize the rotation of the torque shaft 210 and the power shaft 4111.

[0153] Further, the clamping positioning assembly 441 includes a clamping piece 4411, a positioning piece 4412 and a connecting end 4413. The clamping piece 4411 is arranged on the power shaft 4111 and is used for clamping connection with the clamping slot 2121. The positioning piece 4412 is movably connected to the power shaft 4111 and is used for positioning the clamping piece 4411. The connecting end 4413 is used for connecting the clamping control piece 443 and the clamping piece 4411. The clamping control assembly 442 controls the clamping piece 4411 to clamp or separate with the clamping slot 2121 by controlling the connecting end 4413.

[0154] When the transmission shaft 212 is inserted into the bottom of the plug-in slot 4112, the head end of the clamping piece 4411 is clamped and connected to the clamping slot 2121. Since the clamping piece 4411 is axially fixed to the power shaft 4111 through the positioning piece 4412, when the clamping piece 4411 is clamped and connected to the clamping slot 2121, the axial displacement of the transmission shaft 212 and the power shaft 4111 is limited.

[0155] In the embodiment, the clamping piece 4411 is a clamping spring bent towards the transmission shaft 212, and the positioning piece 4412 is a fixing bolt screwed to the power shaft 4111. The clamping piece 4411 is provided with a through hole for the positioning piece 4412 to pass through. The positioning piece 4412 is screwed to the power shaft 4111 through the through hole of the clamping piece 4411, so that the clamping piece 4411 is axially fixed to the power shaft 4111, and the clamping piece 4411 can rotate around the positioning piece 4412 as the center point, thereby being clamped to or separated from the clamping groove 2121.

[0156] The connecting end 4413 is integrally formed on the clamping piece 4411, and is arranged at the tail end of the clamping piece 4411. The connecting end 4413 is a driving spring, and is bent towards the direction away from the power shaft 4111. When the connecting end 4413 is pressed towards the direction of the power shaft 4111, the clamping piece 4411 rotates around the positioning piece 4412 as the center point, so that the head end of the clamping piece 4411 is separated from the clamping groove 2121, and the power shaft 4111 and the transmission shaft 212 can be axially separated.

[0157] The clamping control assembly 442 includes a shaft sleeve 4421 arranged on the handle body 100, a fixed end 4422 fixedly arranged on the inner side of the shaft sleeve 4421, a movable end 4423 movably connected with the shaft sleeve 4421, and a clamping control piece 443. The movable end 4423 is arranged between the positioning piece 4412 and the connecting end 4413, and the clamping control piece 443 is used for controlling the movement of the movable end 4423. The power shaft 4111 passes through the fixed end 4422 and the movable end 4423, and is connected to the transmission shaft 212.

[0158] The fixed end 4422 is a fixed bearing connected with the power shaft 4111, and the movable end 4423 is a sliding block slidably connected with the shaft sleeve 4421 in the axial direction of the shaft sleeve 4421. The clamping control piece 443 includes an elastic piece 4433 connected with the fixed end 4422 and the movable end 4423, and a pull rope 4431 used for controlling the position of the sliding block.

[0159] The pull rope 4431 is provided with a pull ring 4432 at the tail end. The connecting end 4413 is integrally connected with the clamping piece 4411, the proximal end of the connecting end 4413 is bent, and the movable end 4423 slides between the connecting end 4413 and the clamping piece 4411.

[0160] Specifically, the fixed end portion 4422 is fixedly connected to the inner side of the shaft sleeve 4421 and connected to the power shaft 4111, and the power shaft 4111 rotates with the positioning piece 4412 as the base point. The elastic piece 4433 is arranged between the movable end portion 4423 and the positioning piece 4412, and the elastic piece 4433 is used to drive the movable end portion 4423 to slide towards the direction away from the positioning piece 4412. An end of the elastic piece 4433 close to the movable end portion 4423 or the movable end portion 4423 is provided with a pull rope 4431, one end of the pull rope 4431 is connected to the elastic piece 4433 or the movable end portion 4423, and the other end of the pull rope 4431 is connected to a pull ring 4432 outside the handle body 100. An operator can pull the pull rope 4431 through the pull ring 4432 to move the movable end portion 4423 towards the fixed end portion 4422. The elastic piece 4433 is a spring, and the pull rope 4431 is a nickel-titanium wire, which is welded on the spring.

[0161] In the initial state, the movable end portion 4423 is located on the side away from the fixed bearing under the action of the elastic piece 4433, and at this time, the movable end portion 4423 is located on the clamping piece 4411, and the head end of the clamping piece 4411 is clamped and connected in the clamping groove 2121. When the operator pulls the pull rope 4431, the movable end portion 4423 moves towards the fixed end portion 4422 along the axial direction of the shaft sleeve 4421, and presses the connecting end portion 4413 from both sides, so that the connecting end portion 4413 moves towards the power shaft 4111, and the clamping piece 4411 rotates with the positioning piece 4412 as the midpoint, so that the head end of the clamping piece 4411 is separated from the clamping groove 2121. At this time, the power shaft 4111 and the transmission shaft 212 can be axially separated.

[0162] From the above, the torque shaft 210 can be axially detachably connected to the power shaft 4111 by arranging the clamping and positioning assembly 441 and the clamping control assembly 442, and the torque shaft 210 and the power shaft 4111 rotate coaxially by the cooperation of the limiting block 2122 and the limiting groove 4113. The motor output torque drives the torque shaft 210 to rotate through the power shaft 4111.

[0163] The handle body 100 is provided with a collection part 170, which covers the outside of the proximal end of the catheter 200. The collection part 170 is used to collect the plaque discharged from the catheter 200. The collection part 170 is detachably connected to the handle body 100, and the proximal end of the catheter 200 is detachably connected to the collection part 170. The proximal end of the catheter 200 is provided with a buffer sleeve 270, and the buffer sleeve 270 is provided with a sealing groove 271. The handle body 100 and the collection part 170 are connected to the catheter 200 through the sealing groove 271 respectively.

[0164] In this embodiment, the collection section 170 is located at the bottom of the distal end of the handle body 100, and a collection cavity is provided between the collection section 170 and the handle body 100 to accommodate the excised plaque. The proximal end of the catheter 200 is fixedly connected to the distal end of the buffer catheter 200, or the proximal end of the catheter 200 is fixedly connected to the proximal end of the buffer catheter 200. The torque shaft 210 passes through the catheter 200 and the buffer catheter 200 in sequence and extends into the collection section 170, where plaque or thrombus flushed out by the catheter 200 falls into the collection section 170.

[0165] The bushing 4421 is fixedly connected to the handle body 100 and protrudes toward the collection part 170. Other components of the snap-fit ​​control assembly 442 are all located in the inner cavity of the bushing 4421. One end of the power shaft 4111 is connected to the power source 411, and the other end of the power shaft 4111 extends out of the bushing 4421 and is connected to the transmission shaft 212.

[0166] Because the proximal end of the catheter 200 is connected to the buffer sleeve 270, plaque or thrombus in the catheter 200 will fall into the collection section 170 due to the high-speed rotation of the torque shaft 210 and its own gravity after passing through the buffer sleeve 270, and will not continue to move forward with the torque shaft 210. This protects the snap-fit ​​control assembly 442 located in the bushing 4421.

[0167] Furthermore, such as Figure 30 As shown, in this embodiment, the length of the shaft body 213 is greater than the length of the coiled spring 214, and a gap is provided between the proximal end of the coiled spring 214 and the drive shaft 212. The coiled spring 214 is not provided on the shaft body 213 located in the gap. With the above solution, after the plaque or thrombus discharged from the catheter 200 moves to the proximal end of the coiled spring 214, it will fall into the collection part 170 due to the high-speed rotation of the torque shaft 210 and its own gravity, thereby ensuring that the plaque or thrombus will not continue to move forward and affect the snap-fit ​​control component 442.

[0168] Specifically, the buffer sleeve 270 is fixedly mounted on the guide tube 200. The buffer sleeve 270 is made of silicone and has a sealing groove 271. The sealing groove 271 is recessed around the circumference of the buffer sleeve 270 to form an annular groove. After the buffer sleeve 270 is combined with the handle body 100 and the collection part 170, the edges of the handle body 100 and the collection part 170 are connected by the buffer groove to seal them.

[0169] Through the technical scheme, the doctor can replace the catheter 200 according to the actual use. In the specific operation, first, the collecting part 170 is removed, then the pull ring 4432 on the handle body 100 is pulled, the pull ring 4432 is used to transmit the pulling force to the elastic piece 4433 along the pull rope 4431, so that the movable end 4423 moves towards the fixed end 4422. In the process of moving the movable end 4423, the movable end 4423 gradually presses the connecting end 4413, so that the raised connecting end 4413 moves towards the power shaft 4111. Under the linkage action of the connecting end 4413, the clamping piece 4411 embedded in the clamping groove 2121 gradually separates from the clamping groove 2121. When the clamping piece 4411 is separated from the clamping groove 2121, the operator can disassemble the torque shaft 210 and the power shaft 4111 in the axial direction.

[0170] When the new torque shaft 210 is loaded, first, the pull ring 4432 is pulled, then the torque shaft 210 is inserted into the plug-in groove 4112, then the pull ring 4432 is released, and after confirming that the clamping piece 4411 is clamped into the clamping groove 2121, the collecting part 170 is installed on the handle body 100.

[0171] The embodiment adopts the replaceable catheter 200 design, improves the flexibility and economy of the operation, avoids the situation that the plaque or thrombus cannot be discharged from the blood vessel in time due to the blockage of the catheter 200, and causes the distal embolism, and ensures the safety of the patient.

[0172] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A resection device comprising a handle body, a catheter communicating with the handle body, and a blade assembly disposed at a distal end of the catheter, wherein, The bending assembly is arranged on the catheter, and the bending assembly comprises a first bending point, a second bending point and a bending connecting piece for connecting the first bending point and the second bending point. The bending connecting piece is fixedly connected with the first bending point, and the bending connecting piece is movably connected with the second bending point. The first bending point is arranged on the other side relative to the second bending point.

2. The resection device of claim 1, wherein, The bending connecting piece comprises a bending control line, and the catheter is provided with a control line cavity for the bending control line to pass through.

3. The resection device of claim 1, wherein, The second bending point is arranged at the distal end of the control line cavity, the first bending point is a fixed point fixedly arranged on the catheter, or the first bending point is a fixed ring welded on the catheter, the second bending point is an end point at the distal end of the control line cavity, the bending control line passes through the second bending point and is fixedly connected to the first bending point after rotating around the catheter.

4. The resection device of claim 3, wherein, The control assembly comprises a control seat arranged on the handle body and a take-up device movably connected to the control seat.

5. The resection device of claim 3, wherein, The take-up device is connected to the bending control line and used for pulling the bending control line to adjust the posture of the catheter.

6. The resection device of claim 3, wherein, The catheter is provided with a torque shaft connected to the cutter head assembly, and the handle body is provided with a driving mechanism for driving the torque shaft to rotate.

7. The resection device of claim 6, wherein, The cutter head assembly comprises a limiting seat connected to the catheter and a rotary cutting cutter arranged on the limiting seat.

8. The resection device of claim 6, wherein, The rotary cutting cutter is fixedly connected to one end of the torque shaft, the torque shaft drives the rotary cutting cutter to rotate and is connected to the limiting seat. The limiting seat is provided with a protective sleeve covering the side surface of the rotary cutting cutter. The catheter comprises an inner tube and an outer tube arranged outside the inner tube. The inner tube is sleeved outside the torque shaft, the torque shaft is gap-fitted with the inner tube, and a braided layer is arranged between the inner tube and the outer tube. The handle body is provided with an exhaust cavity connected to the catheter. The torque shaft passes through the exhaust cavity and is connected to the driving mechanism. The driving mechanism comprises a power source, a driving transmission assembly for connecting the power source and the torque shaft, and a power supply electrically connected to the power source. The exhaust cavity comprises a main cavity connected to the catheter and a waste pipe arranged on the side surface of the main cavity. The torque shaft passes through the main cavity and is connected to the external space of the handle body.

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