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 torque shaft connected to the cutter head assembly is arranged in the catheter, a driving mechanism for driving the torque shaft to rotate is arranged on the handle body, and the catheter and the driving mechanism are detachably connected. The detachable structure of the catheter and the handle body can be replaced in time when the catheter is blocked, which is beneficial to the smooth operation of the surgery, ensures the success rate of the surgery, and avoids the risk caused by the blockage of the catheter.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, and specifically relates to a resection device. Background Technology

[0002] With the increasing aging of China's population and changes in dietary structure, the incidence of vascular diseases has risen sharply. Peripheral artery disease is one of these vascular diseases. The main cause of peripheral artery disease is atherosclerosis, which often manifests as ischemic changes in the arteries of the limbs, celiac arteries, carotid arteries, and renal arteries. Treatment methods mainly include basic treatment based on drug therapy, open surgical treatment represented by classic surgical bypass, and the recently developed endovascular interventional therapy.

[0003] Although surgical bypass surgery has a relatively superior long-term patency rate, endovascular interventional techniques are gradually being accepted by clinicians and patients due to their advantages of being minimally invasive, safe, effective, and repeatable. Among them, peripheral plaque excision is mainly used for stenosis or occlusion of the femoral, popliteal, and infrakal arteries.

[0004] In clinical practice, doctors can choose to perform percutaneous plaque removal (PCP) based on the patient's peripheral vascular lesions. During the PCP process, as plaque is continuously expelled along the catheter towards the handle, it is inevitable that plaque or thrombi may become lodged in the catheter. If plaque or thrombi become lodged inside the catheter, it will affect the efficiency of the procedure. Furthermore, if plaque or thrombi cannot be expelled from the catheter in a timely manner, there is a high probability that the plaque or thrombus removed by the cutting head will not be expelled from the blood vessel in time, causing embolism in other distal blood vessels and endangering the patient's safety.

[0005] Therefore, a new technological approach is needed to solve the aforementioned problems of existing technologies. Summary of the Invention

[0006] The purpose of this invention is to at least solve the problem that existing resection devices cause prolonged operation time or even failure due to catheter blockage.

[0007] The present invention proposes a cutting device, including a handle body, a conduit communicating with the handle body, and a blade assembly disposed at the distal end of the conduit. The conduit is provided with a torque shaft connected to the blade assembly, and the handle body is provided with a drive mechanism for driving the torque shaft to rotate. The conduit and the drive mechanism are detachably connected.

[0008] The resection device of this invention, by adopting a detachable structure between the catheter and the handle body, allows for timely replacement when the catheter becomes blocked, which facilitates the smooth progress of the operation, ensures the success rate of the operation, and avoids the risks caused by catheter blockage.

[0009] In addition, the resection device according to the present invention may also have the following additional technical features:

[0010] In some embodiments of the present invention, the driving mechanism includes a driving module disposed within the handle body. The driving module includes a power shaft, a power source for driving the power shaft to rotate, and a power supply assembly. The conduit is detachably connected to the power shaft via a connecting module.

[0011] In some embodiments of the present invention, a drive shaft is provided at the proximal end of the torque shaft, and a insertion groove is provided at the distal end of the power shaft. The drive shaft is inserted into the insertion groove and rotates synchronously with the power shaft. A snap-fit ​​groove is provided on the drive shaft, and the connection module includes a snap-fit ​​positioning component that snaps into the snap-fit ​​groove and a snap-fit ​​control component for controlling the snap-fit ​​positioning component.

[0012] In some embodiments of the present invention, the snap-fit ​​positioning assembly includes a snap-fit ​​member disposed on the power shaft and engaged with the snap-fit ​​groove, a positioning member movably connected to the power shaft and used for positioning the snap-fit ​​member, and a connecting end connected to the snap-fit ​​control assembly and the snap-fit ​​member. The snap-fit ​​control assembly controls the snap-fit ​​member to engage or disengage with the snap-fit ​​groove by controlling the connecting end.

[0013] In some embodiments of the present invention, the snap-fit ​​control assembly includes a bushing disposed on the handle body, a fixed end fixedly disposed inside the bushing, a movable end movably connected to the bushing and disposed between the positioning member and the connecting end, and a snap-fit ​​control member for controlling the movement of the movable end, wherein the power shaft passes through the fixed end and the movable end and is connected to the transmission shaft.

[0014] In some embodiments of the present invention, the fixed section is a fixed bearing connected to the power shaft, the movable end is a slider slidably connected to the bushing along the axial direction of the bushing, and the snap-fit ​​control includes an elastic element connected to the fixed bearing and the slider, and a pull rope for controlling the position of the slider.

[0015] In some embodiments of the present invention, the end of the pull rope is provided with a pull ring, the connecting end is integrally connected with the snap-fit ​​member, the proximal end of the connecting end is raised, and the slider slides between the connecting end and the snap-fit ​​member.

[0016] In some embodiments of the present invention, the handle body is provided with a collection part, the collection part is detachably connected to the handle body and covers the outside of the proximal end of the conduit, the proximal end of the conduit is detachably connected to the collection part; the proximal end of the conduit is provided with a buffer seat, the buffer seat is provided with a sealing groove, and the handle body and the collection part are respectively connected to the conduit through the sealing groove.

[0017] In some embodiments of the present invention, the cutter head assembly includes a limiting seat connected to the conduit and a rotary cutting head disposed on the limiting seat. The rotary cutting head is fixedly connected to one end of the torque shaft, and the torque shaft drives the rotary cutting head to rotate and connect to the limiting seat. A protective sleeve covering the side of the rotary cutting head is disposed on the limiting seat.

[0018] In some embodiments of the present invention, the conduit includes an inner tube and an outer tube disposed outside the inner tube, the inner tube is sleeved outside the torque shaft, the torque shaft and the inner tube are clearance-fitted, and a braided layer is provided between the inner tube and the outer tube. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the cutting device in Embodiment 1 of the present invention;

[0020] Figure 2 This is a schematic diagram of the internal structure of the handle body in Embodiment 1 of the present invention;

[0021] Figure 3 This is a schematic diagram of the drive transmission assembly in Embodiment 1 of the present invention;

[0022] Figure 4 This is a schematic diagram of the cutter head assembly in Embodiment 1 of the present invention;

[0023] Figure 5 This is a schematic diagram of the catheter structure in Embodiment 1 of the present invention;

[0024] Figure 6 This is a schematic diagram of the bending adjustment component in Embodiment 1 of the present invention;

[0025] Figure 7 This is a schematic diagram of the structure of the catheter after bending in Embodiment 1 of the present invention;

[0026] Figure 8 This is a schematic diagram of the overall structure of the control component in Embodiment 1 of the present invention;

[0027] Figure 9 This is a cross-sectional view of the control component in Embodiment 1 of the present invention;

[0028] Figure 10This is a side view of a cross-section of the control component in Embodiment 1 of the present invention;

[0029] Figure 11 This is a schematic diagram of the overall structure of the adjustment module when it is in low-speed cutting mode in Embodiment 1 of the present invention;

[0030] Figure 12 This is a schematic diagram of the overall structure of the adjustment module in high-speed cutting according to Embodiment 1 of the present invention;

[0031] Figure 13 This is a partial structural diagram of the adjustment module during low-speed cutting in Embodiment 1 of the present invention;

[0032] Figure 14 This is a partial structural diagram of the adjustment module during high-speed cutting in Embodiment 1 of the present invention;

[0033] Figure 15 This is a schematic diagram of the speed control key in Embodiment 1 of the present invention;

[0034] Figure 16 This is a schematic diagram of the overall structure of the disassembly connection part in Embodiment 1 of the present invention;

[0035] Figure 17 This is an exploded view of the handle body in Embodiment 1 of the present invention;

[0036] Figure 18 This is a partial structural schematic diagram of the engaging component in Embodiment 1 of the present invention;

[0037] Figure 19 This is a schematic diagram of the connection structure between the handle body and the handle cover in Embodiment 1 of the present invention;

[0038] Figure 20 This is a schematic diagram of the connection structure between the handle body and the drive mechanism in Embodiment 1 of the present invention;

[0039] Figure 21 This is a partial structural schematic diagram of the engaging component in Embodiment 1 of the present invention;

[0040] Figure 22 This is a schematic diagram of the conduit and bending assembly in Embodiment 2 of the present invention;

[0041] Figure 23 This is a schematic diagram of the overall structure of the handle body in Embodiment 3 of the present invention;

[0042] Figure 24 This is a schematic diagram of the internal structure of the control component in Embodiment 3 of the present invention;

[0043] Figure 25 This is a schematic diagram of the overall structure of the handle body in Embodiment 4 of the present invention;

[0044] Figure 26 This is a schematic diagram of the internal structure of the control component in Embodiment 4 of the present invention;

[0045] Figure 27 This is a partial structural schematic diagram of the control component in Embodiment 4 of the present invention;

[0046] Figure 28 This is a three-dimensional structural diagram of the handle body in Embodiment 5 of the present invention;

[0047] Figure 29 This is a schematic diagram of the internal structure of the handle body in Embodiment 5 of the present invention;

[0048] Figure 30 This is an exploded view of the handle body in Embodiment 5 of the present invention;

[0049] Figure 31 This is a partial structural diagram of the catheter in Embodiment 5 of the present invention;

[0050] Figure 32 This is in Embodiment 5 of the present invention. Figure 29 A magnified view of point A;

[0051] Figure 33 This is in Embodiment 5 of the present invention. Figure 29 Enlarged view of point B. Detailed Implementation

[0052] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0053] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0054] While terms such as "first," "second," "third," etc., may be used in the text to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used in the text do not imply order or sequence.

[0055] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0056] For ease of description, the following description uses the terms "proximal" and "distal," where "proximal" refers to the end closer to the operator and "distal" refers to the end farther from the operator. The phrase "axial direction" should be understood in this patent as indicating the direction in which the interventional element is advanced and de-escalated, and the direction perpendicular to the "axial direction" is defined as the "radial direction."

[0057] Example 1

[0058] Embodiment 1 of the present invention proposes a resection device, such as... Figures 1 to 3 As shown, it includes a handle body 100, a guide tube 200 communicating with the handle body 100, and a cutter head assembly 300 disposed at the distal end of the guide tube 200. A torque shaft 210 connected to the cutter head assembly 300 is disposed within the guide tube 200. Combined with... Figure 5 As shown, the conduit 200 is provided with a bending assembly 220 for bending the distal end of the conduit 200, and the handle body 100 is provided with a drive mechanism 400 detachably connected to the handle body 100. Combined with... Figure 11 As shown, the drive mechanism 400 includes a drive module 410 for driving the torque shaft 210 to rotate and an adjustment module 420 for controlling the drive module 410 to adjust the torque of the torque shaft 210.

[0059] This invention adjusts the bending radius of the distal catheter 200 through the bending adjustment component 220, causing the catheter 200 to deflect in a predetermined direction and controlling the orientation of the blade assembly 300, thereby reducing the risk of scraping blood vessels and perforating blood vessels. It can achieve the ideal blood vessel diameter through multiple resections. At the same time, an adjustment module 420 is provided for adjusting the torque of the torque shaft 210, so that when the plaque resection device removes harder plaques, the torque of the torque shaft 210 can be adjusted to make plaque removal smoother. On the other hand, by providing a drive mechanism 400 that is detachably connected to the handle body 100, the drive mechanism 400 can be reused, reducing the operating cost of the plaque resection device.

[0060] Specifically, such as Figure 4 As shown, the blade assembly 300 includes a limiting seat 310 connected to the guide tube 200 and a rotary cutting blade 320 disposed on the limiting seat 310. The rotary cutting blade 320 is fixedly connected to one end of the torque shaft 210. The torque shaft 210 drives the rotary cutting blade 320 to rotate and connect to the limiting seat 310. A protective sleeve 330 covering the side of the rotary cutting blade 320 is provided on the limiting seat 310.

[0061] like Figure 5 As shown, the conduit 200 includes an inner tube 230 and an outer tube 240 disposed outside the inner tube 230. The inner tube 230 is sleeved on the outside of the torque shaft 210. The torque shaft 210 and the inner tube 230 are clearance-fitted. The torque shaft 210 penetrates the entire inner cavity of the inner tube 230.

[0062] Furthermore, a braided layer 250 is provided between the inner tube 230 and the outer tube 240. Specifically, the braided layer 250 is a braided mesh formed by braiding nickel-titanium wire. The inner tube 230 and the outer tube 240 are connected by the braided layer 250, thereby enhancing the toughness of the catheter 200. When the catheter 200 penetrates a branch vessel or passes through a bend in the vessel, the catheter 200 will not experience local dents or bends, ensuring the integrity of the lumen of the catheter 200 and guaranteeing the passage of the removed plaque, preventing plaque from blocking the bends in the catheter 200.

[0063] Specifically, the rotary cutting head 320 is fixed to the end of the torque shaft 210 by welding. The rotation of the torque shaft 210 drives the rotary cutting head 320 to rotate. The rotary cutting head 320 is provided with a cutting head groove 321, and the distal end of the limiting seat 310 is provided with a limiting boss 311. The limiting boss 311 engages with the cutting head groove 321, thereby achieving axial and radial limiting between the rotary cutting head 320 and the limiting seat 310.

[0064] The rotary cutting head 320, the limiting seat 310, and the protective sleeve 330 are all made of stainless steel. A spring-loaded tab 312 is provided at the distal end of the limiting seat 310, and a limiting boss 311 is mounted on the spring-loaded tab 312. Since the entire cutting head assembly 300 is made of hard metal, the assembly process of the rotary cutting head 320 and the limiting seat 310 is complex. In this embodiment, a spring-loaded tab 312 is provided at the distal end of the limiting seat 310. The spring-loaded tab 312 is elastic and can undergo elastic deformation during assembly, allowing the limiting boss 311 to smoothly engage in the cutting head slot 321. The protective sleeve 330 is placed on the outside of the limiting seat 310, and the protective sleeve 330 is in close contact with the outer surface of the limiting seat 310. Therefore, after the protective sleeve 330 is assembled, the spring piece 312 is restricted between the rotary cutting head 320 and the protective sleeve 310, thereby completing the snap-fit ​​engagement between the limiting boss 312 and the cutting head groove 321, and thus realizing the axial and radial limiting between the rotary cutting head 320 and the limiting seat 310.

[0065] The conduit 200 comprises, from the inside out, an inner tube 230, a braided layer 250, and an outer tube 240, which are formed into a single unit by heat fusion. Further, a spring tube 260 is provided at the distal end of the conduit 200. The spring tube 260 is sleeved on the outside of the braided layer 250, or the braided layer 250 is sleeved on the outside of the spring tube 260. The spring tube 260 is axially fixed to the braided layer 250 by welding. In this embodiment, the spring tube 260 is sleeved on the outside of the braided layer 250. By providing the spring tube 260 at the distal end of the conduit 200, the compliance and resilience of the distal end of the conduit 200 are enhanced. In other embodiments, the spring tube 260 may also be embedded within the outer tube 240.

[0066] In this application, the braided layer 250 has good bending resistance, and the spring tube 260 has good torque resistance. Therefore, by incorporating the braided layer 250 within the catheter 200 and employing a structure with the spring tube 260 at the distal end of the catheter 200, both bending and torque resistance can be achieved at the distal end of the catheter 200. When the catheter 200 is bent, the cooperation between the braided layer 250 and the spring tube 260 prevents localized concave deformation of the catheter 200 due to bending. This maintains the deformation of the catheter lumen while allowing the catheter 200 to bend, ensuring that the gap between the catheter 200 and the torque axis 210 is sufficient for plaque or thrombus passage, thus ensuring smooth surgical procedures. Simultaneously, it maintains good vascular permeability, making it easier for the catheter 200 to enter more complex and tortuous blood vessels.

[0067] The protective sleeve 330 is fixed to the outer tube 240 by heat fusion. The outer tube 240 is a TPU tube or a Pebax tube. In this embodiment, the outer tube 240 is made of Pebax material.

[0068] Among them, combined Figure 2 The guide tube 200 is equipped with a buffer sleeve 270, which connects the guide tube 200 to the handle body 100. The buffer sleeve 270 and the outer shell of the handle body 100 are connected by a snap-fit ​​mechanism. The buffer sleeve 270 is made of TPU material, or other rubber or plastic materials. The buffer sleeve 270 is made of a soft material, which can eliminate the vibration of the guide tube 200 during rotary cutting, and the vibration transmitted to the handle body 100 will be significantly reduced, thus providing conditions for the operator's precise operation.

[0069] Furthermore, combined Figure 11 and Figure 12 As shown, the drive mechanism 400 also 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. The shift assembly 422 is used to control the cooperation between the adjustment transmission assembly 421 and the drive transmission assembly 412 to adjust the torque of the torque shaft 210. A power supply assembly 413 for driving the power source 411 is provided inside the drive housing 430.

[0070] Specifically, the power source 411 is a motor housed within the drive housing 430, and the power supply assembly 413 is a battery housed within the drive housing 430, electrically connected to the motor. The power supply assembly 413 supplies power to the power source 411, which in turn drives the torque shaft 210 to rotate via the drive transmission assembly 412. The rotation of the torque shaft 210 causes the rotary cutting head 320 located at the distal end to rotate, thereby removing plaque from the blood vessel. A switch 160 is also provided on the handle body 100 to control the operating status of the motor.

[0071] In other embodiments, a power supply assembly 413 for connecting to an external power source and electrically connected to the power source 411 can also be provided on the drive housing 430. That is, when the power source 411 needs to be driven, the external power source is connected through the power supply assembly 413, which includes a power socket provided on the drive housing 430. By providing a power socket, the difficulty and cost of sterilizing and disinfecting the handle body 100 and its internal components can be reduced, as well as the weight and transportation difficulty of the entire device can be reduced.

[0072] Furthermore, combined Figure 2As shown, the handle body 100 is provided with a discharge cavity 500 connected to the catheter 200. The discharge cavity 500 connects the catheter 200 and the external space of the handle body 100. The torque shaft 210 passes through the discharge cavity 500 and is connected to the drive mechanism 400. The discharge cavity 500 includes a main cavity 510 connected to the catheter 200 and a waste discharge pipe 520 provided on the side of the main cavity 510. The torque shaft 210 passes through the main cavity 510 and connects to the external space of the handle body 100. A guidewire cavity 211 is provided inside the torque shaft 210.

[0073] Specifically, the torque shaft 210 is arranged in a spiral shape. When the plaque resection device is working, the motor drives the torque shaft 210 to rotate. Since the torque shaft 210 is arranged in a spiral shape, it can carry the plaque tissue backward out of the catheter 200 during rotation.

[0074] The guidewire lumen 211 within the torque shaft 210 is used to insert a guidewire. The guidewire is used to insert into a blood vessel or branch vessel before the catheter 200 is inserted into or moved, in order to establish an access path for the catheter 200, so that the catheter 200 can move along the access path established by the guidewire.

[0075] The proximal end of the outer tube 240 is bonded and fixed to the main cavity 510. Plaque tissue removed by the rotary cutting head 320 passes through the gap between the torque shaft 210 and the inner tube 230, and is discharged from the conduit 200 into the discharge channel 500 as the torque shaft 210 rotates. The main cavity 510 of the discharge channel 500 temporarily contains the removed plaque tissue, which is then ultimately discharged through the waste discharge tube 520. The waste discharge tube 520 is located near the proximal end of the main cavity 510 and is inclined along the direction of plaque removal to facilitate plaque discharge.

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

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

[0078] The bending connector 222 includes a bending control line 2225. The guide tube 200 has a control line cavity 2226 through which the bending control line 2225 passes. A second bending point 2214 is located at the distal end of the control line cavity 2226. The bending control line 2225 passes through the second bending point 2214 and, after rotating around the guide tube 200, is fixedly connected to the first bending point 2213. In this embodiment, to ensure that the orientation of the cutter head assembly 300 is the same as that of the guide tube 200, the first bending point 2213 and the second bending point 2214 are set 180 degrees apart in the circumferential direction.

[0079] Specifically, a control line cavity 2226 is provided inside the conduit 200. The control line cavity 2226 can be located inside the outer tube 240 or inside the inner tube 230. Among them, the first bending point 2213 is a fixed point fixedly set on the braided layer 250 and is fixedly connected to the bending control line 2225 through the fixed point. The second bending point 2214 is the distal end of the control line cavity 2226.

[0080] In this embodiment, the first bending point 2213 is a fixing ring welded and fixed to the braided layer 250. The fixing ring presses and fixes the bending control line 2225 to the braided layer 250, or the bending control line 2225 is welded and fixed to the fixing ring. By setting the first bending point 2213 as a ring, the multi-phase connection of the bending control line 2225 is satisfied, which facilitates the angle adjustment and fixation of the bending control line.

[0081] One end of the bending control line 2225 is connected to the take-up coil 142. The other end of the bending control line 2225 first passes through the control line cavity 2226, then spirals 180 degrees along the gap between the inner tube 230 and the braided layer 250, and is then 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 positioned opposite the first bending point 2213, the orientation of the cutter head assembly 300 will be approximately the same as that of the guide tube 200 after bending.

[0082] Furthermore, the axial length of the spiral portion of the bending control line 2225 extending from 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 high, which is not conducive to operation. Therefore, in this embodiment, the axial length of the spiral portion of the bending control line 2225 extending from 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] Furthermore, in this embodiment, by adjusting the take-up device 142, the bending control line 2225 is controlled to move within the control line cavity 2226 or the inner tube 230. Since the bending control line 2225 rotates 180 degrees spirally along the inner tube 230 at the distal end of the catheter 200, when the bending control line 2225 contracts, it exerts both axial and radial forces on the distal end of the catheter 200. This allows control of the axial and radial displacement of the blade assembly 300, thus enabling the blade assembly 300 to achieve an S-shaped bend. Because the bending control line 2225 rotates 180 degrees, the blade assembly 300 and the catheter 200 maintain the same axial direction, reducing the risk of the blade assembly 300 abrading the vessel wall. Furthermore, the removal of intravascular plaque before and after bending by the blade assembly 300 allows for a larger lumen in the blood vessel.

[0084] like Figures 8 to 10 As shown, the control component of this embodiment includes a control base disposed on the handle body and a retractor movably connected to the control base. The retractor includes a locking member 1421 for self-locking.

[0085] The handle body 100 is provided with a control groove 150, and the control component 140 is disposed in the control groove 150. A push rod 151 is provided at one end of the control groove 150, and a top groove 1411 is provided at the end of the control seat 141 facing the push 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 push 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 push rod 151.

[0086] The take-up reel 142 is housed within the control base 141, and has a clamping part 143 for holding the bending control cable 2225. The locking element 1421 consists of an internal thread on the inner wall of the control base 141 and an external thread on the outer wall of the take-up reel 142. The take-up reel 142 is threadedly connected to the control base 141, and the internal thread on the control base and the external thread on the take-up reel are self-locking. After the doctor releases the take-up reel, it will not move relative to the control base due to the self-locking relationship between the internal and external threads, thus achieving self-locking of the take-up reel.

[0087] A slide rod 144 is provided inside the control base 141. The slide rod 144 is arranged along the axial direction of the control base 141. The take-up coil 142 is slidably connected to the slide rod 144. A rotation limiting surface 1441 is provided between the slide rod 144 and the take-up coil 142, so that the take-up coil 142 can translate along the length direction of the slide rod 144 and cannot rotate relative to the slide rod 144, thus forming a screw linkage relationship.

[0088] Therefore, when the control seat 141 is rotated, the take-up coil 142 can slide on the slide rod 144 and move relative to the control seat 141 under the linkage of the threaded engagement. The take-up coil 142 clamps the bending control line 2225, and the bending control line 2225 moves with the take-up coil 142 relative to the handle body 100, thereby controlling the guide tube 200 to perform bending action.

[0089] In further embodiments of this application, such as Figures 11 to 15 As shown, the drive transmission assembly 412 includes a first transmission member 4121 connected to the torque shaft 210, a second transmission member 4122 connected to the power source 411, and a third transmission member 4123 disposed 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] like Figure 13 As shown, the adjusting 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 shifting assembly 422 includes a drive wheel shaft 4221 connected to the output shaft of the power source 411 and a lever 4222 connected to the drive wheel shaft 4221. The third transmission member 4123 and the fifth transmission member 4212 are both arranged on the drive wheel shaft 4221. The drive wheel shaft 4221 is slidably connected to the output shaft and rotates synchronously. The 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, in this embodiment, all transmission components are gears. The power source 411 is a motor, the first transmission component 4121 is an output gear connected to the torque shaft 210, the second transmission component 4122 is a drive gear connected to the motor, and the third transmission component 4123 is a transmission gear mounted on the drive housing 430. The drive gear, transmission gear, and output gear are sequentially meshed and connected.

[0092] In addition, the regulating transmission assembly 421 in this embodiment is provided with a second set of gear assemblies, namely a fourth transmission member 4211 and a fifth transmission member 4212. Among them, 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 component 4211 and the second transmission component 4122 are both mounted on the drive shaft 4221. The motor directly drives the output shaft to rotate, and the drive shaft 4221 is slidably connected to the motor's output shaft and rotates synchronously with the motor's output shaft. The fifth transmission component 4212 is connected to the third transmission component 4123 via the driven shaft 4224, and the fifth transmission component 4212 and the third transmission component 4123 rotate coaxially via the driven shaft 4224.

[0094] The drive wheel shaft 4221 is fixedly connected to the lever 4222, and the end of the lever 4222 is provided with a speed adjustment key 4223, which is slidably connected to the handle body 100. Figure 15 As shown, the drive housing 430 is provided with a low-speed limit groove 4113 and a high-speed limit groove 4113. When the rotary cutter head 320 is cutting at a low speed, the speed control key 4223 is located in the low-speed limit groove 4113, and the second transmission member 4122, the third transmission member 4123 and the first transmission member 4121 are sequentially meshed and connected.

[0095] The specific working principle of the drive module 410 in this embodiment is as follows: When the power source 411 is working and drives the second transmission component 4122 to rotate, the motor starts running and drives the second transmission component 4122 to rotate. The second transmission component 4122 transmits its rotational speed to the third transmission component 4123 through meshing with it. The third transmission component 4123 transmits its speed to the first transmission component 4121 through meshing with it. The first transmission component 4121 then transmits its speed to the torque shaft 210, which drives the rotary cutting head 320 to rotate, completing the low-speed cutting. During low-speed cutting, the torque shaft rotates at a relatively low speed, while the torque is relatively high.

[0096] When switching between high and low gears, the speed control key 4223 is activated, causing it to move to the high-speed limit slot 4113. The lever 4222 moves under the influence of the speed control key 4223, which in turn moves the drive shaft 4221, disengaging 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 mounted on the drive shaft 4221, the fourth transmission member 4211 also moves along with the drive shaft 4221 and engages with the fifth transmission member 4212, completing the switching of the gear meshing relationship.

[0097] In this embodiment, the number of teeth in the fourth transmission member 4211 is greater than the number of teeth in the second transmission member 4122, and the number of teeth in the fifth transmission member 4212 is less than the number of teeth in the third transmission member 4123. Therefore, in the transmission state where the fourth transmission member 4211 and the fifth transmission member 4212 are engaged, the rotational speed of the fifth transmission member 4212 is higher than that of the second transmission member 4122 engaged with the driven gear.

[0098] Because the fifth transmission component 4212 rotates at a higher speed, and transmits this higher speed to the third transmission component 4123 via the driven wheel shaft 4224, and the third transmission component 4123 meshes with the first transmission component 4121, the first transmission component 4121 rotates at an even higher speed, thus completing the high-speed cutting of the rotary cutting head 320. During high-speed cutting, the torque shaft rotates at a higher speed, while the torque is lower.

[0099] Based on the above solution of this embodiment, by setting additional gear sets, namely the fourth transmission member 4211 and the fifth transmission member 4212, in the adjustment module 420, and adjusting the meshing relationship between the gear assemblies through the shifting component 422, the high-speed and low-speed gears of the rotary cutting head 320 are adjusted, thereby achieving high-torque and low-torque adjustment of the rotary cutting head 320 torque. Doctors can flexibly select the cutting speed according to the texture of the plaque, avoiding the phenomenon of the cutting head getting stuck, improving the stability of use, and avoiding vascular damage.

[0100] During routine cutting, the surgeon can select the high-speed setting to maximize plaque removal efficiency. When encountering plaque blockage or difficult-to-remove plaque, especially when plaque or thrombus gets stuck at the bend of catheter 200 due to its curvature, the surgeon can select the low-speed setting to increase the torque of the torque shaft 210. This prevents plaque or thrombus from failing to pass through the bend of catheter 200, ensuring that catheter 200 does not become blocked and preventing the rotary cutting head 320 from jamming, thus ensuring the smooth progress of the surgery.

[0101] In other embodiments, additional gear assemblies can be provided to increase the number of adjustable gears, such as achieving three adjustable gears, thereby providing doctors with more options. Furthermore, the above speed adjustment scheme is merely an example; any mechanical structure capable of adjusting the torque shaft torque is within the scope of protection of this application.

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

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

[0104] This embodiment utilizes a detachable design for the drive mechanism 400. Firstly, it facilitates initial sterilization by allowing for the separate sterilization of the power supply component 413, which is more difficult to sterilize within the drive mechanism 400. Then, rapid assembly is achieved by disassembling the connecting part 130, reducing the overall sterilization difficulty of the resection device and accelerating production assembly, thus improving production efficiency. Secondly, after use, the disassembled components can be reused within the limits permitted by medical regulations, increasing component utilization and reducing operating costs. Furthermore, after use, the resection device can be quickly disassembled, allowing for flexible classification, recycling, and disposal according to medical regulations, reducing recycling difficulty and costs.

[0105] The disassembly connection part 130 includes a hook assembly 131 and a locking assembly 132 disposed between the assembly part 110 and the drive housing 430. The hook assembly 131 and the locking assembly 132 are respectively disposed at both ends of the assembly part 110, and a pop-out part 133 is disposed between the drive housing 430 and the bottom of the assembly part 110.

[0106] Specifically, the assembly part 110 is an assembly slot provided on the handle body 100 for mounting the drive mechanism 400. The drive mechanism 400 is disposed within the assembly part 110 and is detachably connected to the handle body 100. The drive mechanism 400 is detachably connected to the assembly part 110 via a drive housing 430, enabling the entire drive mechanism 400 to be detachable and replaceable. Both the drive module 410 and the adjustment module 420 are installed within the drive housing 430.

[0107] In this embodiment, the drive mechanism 400 is designed as a detachable structure, allowing it to be reused in accordance with regulations. Furthermore, the drive mechanism 400 and the handle body 100 can be sorted and recycled according to medical usage guidelines.

[0108] Furthermore, such as Figure 18 As shown, the engaging assembly 132 is located at the proximal end of the handle body 100, and the hook assembly 131 is located at the distal end of the handle body 100. The engaging assembly 132 includes a locking pin 1321 slidably connected to the drive housing 430 and a locking key 1322 disposed 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 bonded together.

[0109] The inner wall of the assembly part 110 is provided with a locking hole 1323 for engaging with the locking pin 1321. The user can move the locking pin 1321 by moving the locking key 1322 and control the locking pin 1321 to insert into the locking hole 1323 to fix the locking pin 1321 to the locking hole 1323, or control the locking pin 1321 to disengage from the locking hole 1323 to separate the locking pin 1321 from the locking hole 1323. When the locking pin 1321 is inserted into the locking hole 1323, the drive mechanism 400 and the assembly part 110 are in a fixed state. When the locking pin 1321 is disengaged from the locking hole 1323, the drive mechanism 400 and the assembly part 110 are in a separated state.

[0110] The locking key 1322 has a locking clip 1324 at its bottom. The drive housing 430 has a locking groove 1325 and a separating groove 1326 on its surface. The separating groove 1326 is positioned away from the locking hole 1323 relative to the locking groove 1325. The locking groove 1325 and the separating groove 1326 are respectively used to engage and fix with the locking clip 1324. When the locking key 1322 drives the locking pin 1321 to move towards the locking hole 1323 and causes the locking clip 1324 to engage in the locking groove 1325, the locking pin 1321 is inserted into the locking hole 1323, and the drive mechanism 400 is engaged and fixed with the assembly part 110. When the locking key 1322 drives the locking pin 1321 to move away from the locking hole 1323 and causes the locking clip 1324 to engage in the separation fixing groove 1326, the locking pin 1321 separates from the locking hole 1323, and the drive mechanism 400 separates from the assembly part 110.

[0111] A spring-loaded ejector 133 is provided between the bottom of the drive housing 430 and the assembly part 110 to eject the drive mechanism 400. The spring-loaded ejector 133 is preferably a spring. That is, when the locking pin 1321 disengages from the locking hole 1323, the spring-loaded ejector 133 automatically ejects the drive mechanism 400 from the assembly part 110, thereby facilitating the user to remove the drive mechanism 400.

[0112] The hook assembly 131 is disposed at the other end of the drive housing 430 relative to the locking pin 1321. The hook assembly 131 includes a hook 1311 disposed on the far end face of the drive housing 430 and a hook groove 1312 disposed on the inner surface of the assembly part 110 and hooked to the hook 1311.

[0113] When fixing the drive mechanism 400 in the assembly part 110, first hook 1311 is hooked and connected to hook groove 1312, thereby fixing the far end of the drive mechanism 400 to the assembly part 110. Then, the locking key 1322 of the locking assembly 132 is inserted into the locking hole 1323, thereby fixing the far end of the drive mechanism 400 to the assembly part 110.

[0114] When removing the drive mechanism 400 from the assembly part 110, first separate the locking key 1322 of the engaging assembly 132 from the locking hole 1323 to separate the proximal end of the drive mechanism 400 from the assembly part 110, and then remove the hook 1311 from the hook groove 1312 to separate the distal end of the drive mechanism 400 from the assembly part 110.

[0115] In this embodiment, the handle body 100 is also provided with a handle cover 120 that is detachably connected to the handle body 100 and located outside the drive mechanism 400.

[0116] Among them, combined Figure 19 As shown, the distal end of the handle cover 120 is fixed to the hook groove 1312 of the handle body 100 by a snap-fit ​​structure. A cover pin 123 is provided at the distal end of the handle cover 120, which is inserted into the hook groove 1312. A plate 121 is provided at the proximal end of the handle cover 120, positioned between the drive housing 430 and the hook groove 1312. The plate 121 has a hole 122 that mates with the locking pin 1321. After the cover pin 123 of the handle cover 120 is snapped into the hook groove 1312, the handle body 100 is fitted against the drive housing 430, and then the locking key 1322 is operated to move towards the locking hole 1323. The locking key 1322 first passes through the insertion hole 122 on the insertion plate 121, and then is inserted into the retracted hole, so as to simultaneously fix the handle cover 120 and the drive mechanism 400 to the handle body 100.

[0117] This application protects the drive mechanism 400 from damage caused by external impacts or other factors by providing a handle cover 120 on the drive mechanism 400. Furthermore, after disassembling the handle body 100 from the drive mechanism 400, the disassembled parts can be classified, recycled, and disposed of according to relevant physiotherapy regulations.

[0118] In this embodiment, the bending component 220 is located at the distal end of the handle body 100, which facilitates the doctor's operation during the operation. The catheter 200 enters 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 cavity 500 located in the middle of the handle body 100.

[0119] The discharge channel 500 is located in the middle of the handle body 100. The torque shaft 210 passes through the handle body 100. The torque shaft 210 first passes through the catheter 200 and then enters the main lumen 510 through the catheter 200. Plaque or thrombus delivered from the catheter 200 falls into the main lumen 510 and is discharged from the waste discharge tube. The waste discharge tube is inclined relative to the main lumen 510 to facilitate the discharge of plaque or thrombus.

[0120] The torque shaft 210 extends out of the discharge cavity 500 and is connected to the handle body 100 via a bearing. The guidewire cavity 211 of the torque shaft 210 is connected to the external space of the handle body 100, so that the guidewire passes through the guidewire cavity 211, passes through the torque shaft 210, and exits from the distal end of the torque shaft 210, thereby establishing a pathway for the catheter 200 to enter the blood vessel.

[0121] The drive mechanism 400 is positioned above the catheter 200 and the discharge channel 500, and the drive transmission assembly 412 is located at the proximal end of the discharge channel 500 and connected to the torque shaft 210. Thus, plaque or thrombus is discharged from the handle body 100 through the discharge channel 500 located at the distal end of the drive transmission assembly 412, without the plaque or thrombus contacting the drive transmission assembly 412.

[0122] Furthermore, a sealed design is adopted between the drive transmission assembly 412 and the discharge cavity 500. Specifically, a sealing structure 4124 is provided between the first transmission component 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 passes through the rolling bearing and is fixedly and sealed to the rolling bearing. Specifically, the gap between the torque shaft 210 and the rolling bearing can be filled with solder and welded in place. Then, the sealing ring is used to seal the rolling bearing and the handle body 100. Thus, the drive mechanism 400 of this embodiment can remain clean after use, which facilitates recycling and allows for reuse.

[0123] In summary, this application adjusts the bending radius of the distal catheter 200 via the bending adjustment component 220, causing the catheter 200 to deflect in a predetermined direction, and controls the orientation of the blade assembly 300, reducing the risk of scraping blood vessels and causing vascular perforation. This allows for obtaining the ideal blood vessel diameter through multiple resections. Simultaneously, an adjustment module 420 is provided to adjust the torque of the torque shaft 210, enabling smoother plaque removal when cutting harder plaques. Furthermore, by providing a drive mechanism 400 detachably connected to the handle body 100, the drive mechanism 400 can be reused, reducing the operating cost of the plaque removal device.

[0124] Example 2

[0125] Embodiment 2 of the present invention proposes a resection device, such as... Figure 22 As shown, the similarities between Embodiment 2 and Embodiment 1 will not be repeated. The difference between Embodiment 2 and Embodiment 1 is that the bending point 221 includes a bending fixing member 2211 disposed on the guide tube 200 and a return fixing member 2212 disposed on the cutter head assembly 300. The bending connector 222 is used to connect the bending fixing member 2211 and the return fixing member 2212. The return fixing member 2212 is disposed at the proximal end of the cutter head assembly 300, and the bending fixing member 2211 is disposed on the other side of the guide tube 200 relative to the return fixing member 2212.

[0126] The bending connector 222 includes a bending connecting line 2221 and a return connecting line 2222. The conduit 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 component 140 and the bending fixing component 2211, and the return connecting line 2222 is used to connect the control component 140 and the return fixing component 2212.

[0127] The return fixing member 2212 is located at the proximal end of the cutter head assembly 300, and the bending fixing member 2211 is located on the other side of the guide tube 200 relative to the return fixing member 2212. Preferably, the bending fixing member 2211 and the return fixing member 2212 are positioned 180 degrees apart in the circumferential direction.

[0128] Specifically, the conduit 200 is provided with a bending adjustment cavity 2223 and a return cavity 2224, both of which are located within the outer tube 240 or between the outer tube 240 and the braided layer 250. One end of the bending adjustment connecting line 2221 is connected to the bending adjustment fixing member 2211, then passes through the bending adjustment cavity 2223, and the other end is connected to the control component 140. One end of the return cavity 2222 is connected to the bending adjustment fixing member 2211, then passes through the return cavity 2224, and the other end is connected to the control component 140.

[0129] The bending connection line 2221 and the return connection line 2222 are respectively fixed on the take-up device 142. When the doctor rotates the control seat 141, the take-up device 142 slides on the slide rod 144 relative to the control seat 141, thereby simultaneously pulling the bending connection line 2221 and the return connection line 2222, thereby adjusting the posture of the catheter 200 and the blade assembly 300.

[0130] The return fixing component 2212 is mounted on the protective sleeve 330. The return fixing component 2212 is a fixing plate mounted on the protective sleeve 330. The return connecting line 2222 is welded to the fixing plate, or the return fixing component 2212 has a connecting hole through which the return connecting line 2222 passes and is knotted for fixation. The bending fixing component 2211 is a fixing ring mounted on the braided layer 250 of the conduit 200. The fixing ring presses and fixes the bending connecting line 2221 to the braided layer 250, or the bending connecting line 2221 is welded to the fixing ring.

[0131] Because the bending fixing element 2211 is located on the opposite side of the catheter 200 relative to the return fixing element 2212, when the retractor 142 simultaneously pulls the bending connecting line 2221 and the return connecting line 2222, the bending connecting line 2221 controls the axial displacement of the catheter 200 through the bending fixing element 2211, and the return fixing element 2212 controls the radial displacement of the blade assembly 300 through the return fixing element 2212. Under the combined action of the bending connecting line 2221 and the return connecting line 2222, the blade assembly 300 achieves an S-shaped bend, thereby keeping the blade assembly 300 and the catheter 200 in the same axial direction, reducing the risk of the blade assembly 300 abrading the blood vessel wall. Furthermore, the removal of intravascular plaque before and after bending by the blade assembly 300 allows for a larger lumen in the blood vessel.

[0132] This embodiment achieves an S-shaped bend in the catheter 200 and the cutting head assembly 300 through the bending adjustment component 220. This allows for a larger cutting area when cutting plaque within the blood vessel. Simultaneously, because the cutting head assembly 300 is aligned with the axial direction of the catheter 200 by the return fixing component 2212, it avoids accidentally cutting the vessel wall during advancement, significantly reducing the risk of the cutting head assembly 300 abrading the vessel wall. Compared to existing bending methods, this application provides a larger lumen for the blood vessel while ensuring safety during cutting.

[0133] Example 3

[0134] Embodiment 3 of the present invention proposes a resection device, such as... Figure 23 and Figure 24 As shown, the similarities between Embodiment 3 and Embodiment 1 will not be repeated. The difference between Embodiment 3 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 snapped and fixed in the control groove 150, and the take-up device 142 includes a slide button 145 slidably connected to the control seat 141 and a connection point 1451 disposed on the slide button 145. The connection point 1451 is used to connect the bending connector 222, and the bending connector 222 is a bending connector 2221.

[0135] Specifically, the control base 141 is provided with a slide groove 1412 and a slider 1413 slidably connected to the slide groove 1412. The slide groove 1412 is arranged along the length direction of the control base 141. The slider 1413 is provided with a fixing hole 1414. A fixing post 1452 is provided at the end of the control base 141's sliding button 145 facing the slider 1413. The fixing post 1452 passes through the fixing hole 1414, so that the sliding button 145 is connected to the slider 1413 through the fixing post 1452. A control spring 146 is provided between the sliding button 145 and the slider 1413. The sliding button 145 and the slider 1413 are slidably connected to the control base 141 at the same time, and the control spring 146 has an initial pressure, so that the sliding button 145 is tightly pressed against the inner wall of the control base 141.

[0136] The locking element 1421 is a rough contact surface between the slider 145 and the control seat 141. When the control assembly 140 is in its natural state, the control spring 146 drives the slider 145 to press tightly against the inner wall of the control seat 141. Because of the rough contact surface between the slider 145 and the control seat 141, the slider 145 and the control seat 141 will not move relative to each other under the action of friction, thus achieving self-locking of the retractor 142. When the slider 145 is pressed into the control seat 141, the control spring 146 is compressed, and the slider 145 separates from the control seat 141. At this time, the slider 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] A rotating clamp 1471 is provided on the knob 147. The rotating clamp 1471 is used to connect the bending connector 222, which is a bending connecting wire 2221. Rotating the knob 147 causes the bending connector 222 to wind around the rotating clamp 1471, thereby pulling the bending connector 222 to adjust the posture of the guide tube 200. In the natural state, the stop spring 1481 drives the stop pin to move towards the knob 147 and engages in the stop groove 1472. When it is necessary to rotate the knob 147, the stop pin 148 is slid away from the knob 147 to separate the stop pin 148 from the stop groove 1472, at which point the knob 147 can be rotated. When it is necessary to lock the knob 147, release the stop pin 148. The stop spring 1481 drives the stop pin 148 to slide towards the knob 147 so that the stop pin 148 engages with the stop groove 1472. At this time, the knob 147 cannot be rotated.

[0143] In a further embodiment of this application, the control component 140 further includes a locking safety component 1422 for preventing accidental activation, the locking safety component 1422 being disposed between the control base 141 and the take-up coil 142.

[0144] Specifically, a positioning post 1415 is provided inside the control base 141, and a positioning spring 1416 is sleeved on the positioning post 1415. The positioning spring 1416 is located between the control base 141 and the knob 147. The knob 147 can move along its own axial direction, and a locking safety component 1422 is provided between the rotating clamp 1471 and the control base 141. The locking safety component 1422 is a locking structure 149. The locking structure 149 includes a locking groove 1491 located at the end of the rotating clamp 1471 facing the knob 147, and a locking block 1492 located at the end of the control base 141 facing the rotating clamp 1471. When the locking block 1492 is engaged and fixed with the locking groove 1491, the knob 147 cannot rotate.

[0145] In actual operation, under normal conditions, the positioning spring 1416 pushes the knob 147 outward to engage and fix the locking structure 149 between the rotating clamp 1471 and the control seat 141. Simultaneously, the stop pin 148, driven by the stop spring 1481, is engaged with the stop groove 1472. When the stop pin 148 is inserted into the stop groove 1472, it is located between the knob 147 and the control seat 141, blocking the axial movement path of the knob 147. Therefore, the knob 147 cannot be pressed, nor can the engagement between the locking block 1492 and the locking groove 1491 be released. Thus, under normal conditions, the knob 147 cannot rotate. When it is necessary to rotate knob 147, the operator first slides the stop pin 148 away from knob 147 to separate the stop pin 148 from the stop groove 1472, and then presses knob 147 inward. The positioning spring 1416 is compressed by force, which at the same time separates the locking structure 149, that is, the locking block 1492 separates from the locking groove 1491. At this time, knob 147 can be rotated.

[0146] Therefore, in this embodiment, the control component 140 achieves double locking of the retractor 142 by setting an additional locking safety component 1422 between the control base 141 and the retractor 142, improving the reliability of the structure and ensuring that the posture of the blade assembly 300 does not change when the doctor advances the blade assembly 300 to cut the plaque. The knob 147 can only be rotated when the doctor simultaneously pushes the stop pin 148 and presses the knob 147, preventing accidental changes in the orientation of the blade assembly 300, avoiding the cutting blade 320 from cutting blood vessels, thus preventing medical accidents and ensuring the smooth progress of the surgery.

[0147] Example 5

[0148] Embodiment 5 of the present invention provides a resection device, such as Figures 29 to 33 As shown, the similarities between Embodiment 5 and Embodiment 1 will not be repeated here. The difference between Embodiment 5 and Embodiment 1 is that the drive mechanism 400 is disposed inside the handle body 100, and the conduit 200 is detachably connected to the drive mechanism 400.

[0149] Specifically, in combination Figure 2 As shown, the drive mechanism 400 includes a drive module 410 disposed within the handle body 100. The drive module 410 includes a power shaft 4111, a power source 411, and a power supply assembly 413. The power source 411 drives the power shaft 4111 to rotate. The conduit 200 is detachably connected to the power shaft 4111 via a connection module 440. The power source 411 is a motor, which drives the torque shaft 210 to rotate. The power supply assembly 413 is a battery electrically connected to the motor.

[0150] Among them, combined Figures 31 to 33As shown, a drive shaft 212 is provided at the near end of the torque shaft 210, and a insertion groove 4112 is provided at the far end of the power shaft 4111. The drive shaft 212 is inserted into the insertion groove 4112 and rotates synchronously with the power shaft 4111. A snap-fit ​​groove 2121 is provided on the drive shaft 212. The connection module 440 includes a snap-fit ​​positioning component 441 that snaps into the snap-fit ​​groove 2121 and a snap-fit ​​control component 442 for controlling the snap-fit ​​positioning component 441.

[0151] In this embodiment, the torque shaft 210 specifically includes a shaft body 213 and a coiled spring 214 disposed on the shaft body 213. The coiled spring 214 is spirally wound and fixed to the shaft body 213, and can be fixed by welding. The rotation direction of the coiled spring 214 is opposite to the rotation direction of the shaft body 213. When the motor drives the torque shaft 210 to rotate, the coiled spring 214, which rotates in the opposite direction to the shaft body 213, can more quickly deliver the plaque in the catheter 200, improving the resection efficiency.

[0152] Furthermore, at least one limiting block 2122 is provided on the drive shaft 212, and a limiting groove 4113 is provided on the inner wall of the insertion groove 4112. After the drive shaft 212 is inserted into the insertion groove 4112, the limiting block 2122 is used to fit with the limiting groove 4113 to fix the drive shaft 212 circumferentially to the power shaft 4111. In this embodiment, three circumferentially arrayed limiting blocks 2122 are provided on the drive shaft 212. The three limiting blocks 2122 cooperate with the limiting groove 4113 in an insertion manner to make the power shaft 4111 and the drive shaft 212 rotate synchronously in the circumferential direction, so that the torque shaft 210 rotates synchronously with the power shaft 4111.

[0153] Furthermore, the snap-fit ​​positioning assembly 441 includes a snap-fit ​​member 4411, a positioning member 4412, and a connecting end 4413. The snap-fit ​​member 4411 is disposed on the power shaft 4111 and is used to snap-fit ​​with the snap-fit ​​groove 2121. The positioning member 4412 is movably connected to the power shaft 4111 and is used to position the snap-fit ​​member 4411. The connecting end 4413 is used to connect the snap-fit ​​control member 443 and the snap-fit ​​member 4411. The snap-fit ​​control assembly 442 controls the snap-fit ​​member 4411 to snap-fit ​​with or separate from the snap-fit ​​groove 2121 by controlling the connecting end 4413.

[0154] When the drive shaft 212 is inserted into the bottom of the insertion slot 4112, the head end of the snap-fit ​​member 4411 engages with the snap-fit ​​slot 2121. Since the snap-fit ​​member 4411 is axially fixed to the power shaft 4111 by the positioning member 4412, the axial displacement of the drive shaft 212 and the power shaft 4111 is restricted when the snap-fit ​​member 4411 engages with the snap-fit ​​slot 2121.

[0155] In this embodiment, the snap-fit ​​element 4411 is a snap-fit ​​spring with its head bent toward the drive shaft 212, and the positioning element 4412 is a fixing bolt threaded to the power shaft 4111. The snap-fit ​​element 4411 is provided with a through hole for the positioning element 4412 to pass through. By passing the positioning element 4412 through the through hole on the snap-fit ​​element 4411 and threading it to the power shaft 4111, the snap-fit ​​element 4411 is axially fixed to the power shaft 4111, and the snap-fit ​​element 4411 can rotate about the positioning element 4412 as the center point, thereby engaging with or disengaging from the snap-fit ​​groove 2121.

[0156] The connecting end 4413 is integrally formed on the snap-fit ​​part 4411. The connecting end 4413 is located at the tail end of the snap-fit ​​part 4411. The connecting end 4413 is a driving spring, and the driving spring is bent in the direction away from the power shaft 4111. When the connecting end 4413 is pressed in the direction of the power shaft 4111, the snap-fit ​​part 4411 rotates with the positioning part 4412 as the midpoint, so that the head end of the snap-fit ​​part 4411 disengages from the snap-fit ​​groove 2121, allowing the power shaft 4111 and the transmission shaft 212 to separate axially.

[0157] The snap-fit ​​control assembly 442 includes a bushing 4421 disposed on the handle body 100, a fixed end 4422 fixedly disposed inside the bushing 4421, a movable end 4423 movably connected to the bushing 4421, and a snap-fit ​​control member 443. The movable end 4423 is disposed between the positioning member 4412 and the connecting end 4413. The snap-fit ​​control member 443 is used to control 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 drive shaft 212.

[0158] The fixed end 4422 is a fixed bearing connected to the power shaft 4111, and the movable end 4423 is a sliding block that is slidably connected to the bushing 4421 along the axial direction of the bushing 4421. The locking control element 443 includes an elastic element 4433 connected to the fixed end 4422 and the movable end 4423, and a pull rope 4431 for controlling the position of the sliding block.

[0159] The end of the pull rope 4431 is provided with a pull ring 4432, the connecting end 4413 is integrally connected with the snap fastener 4411, the proximal end of the connecting end 4413 is raised, and the movable end 4423 slides between the connecting end 4413 and the snap fastener 4411.

[0160] Specifically, the fixed end 4422 is fixedly connected to the inner side of the bushing 4421 and connected to the power shaft 4111, which rotates around the positioning member 4412 as a base point. An elastic member 4433 is provided between the movable end 4423 and the positioning member 4412. The elastic member 4433 drives the movable end 4423 to slide away from the positioning member 4412. A pull rope 4431 is provided at one end of the elastic member 4433 near the movable end 4423 or on the movable end 4423. One end of the pull rope 4431 is connected to the elastic member 4433 or the movable end 4423, and the other end of the pull rope 4431 is connected to a pull ring 4432 on the outside of the handle body 100. The operator can pull the pull rope 4431 through the pull ring 4432 to move the movable end 4423 towards the fixed end 4422. The elastic member 4433 is a spring, and the pull rope 4431 is a nickel-titanium wire welded to the spring.

[0161] In the initial state, the movable end 4423, under the force of the elastic element 4433, is located on the side away from the fixed bearing. At this time, the movable end 4423 is located on the snap-fit ​​element 4411, and the head end of the snap-fit ​​element 4411 is engaged in the snap-fit ​​groove 2121. When the operator pulls the pull rope 4431, the movable end 4423 moves towards the fixed end 4422 along the axial direction of the bushing 4421 and squeezes the connecting end 4413 from both sides, causing the connecting end 4413 to move towards the power shaft 4111 and causing the snap-fit ​​element 4411 to rotate around the positioning element 4412 as the midpoint. Thus, the head end of the snap-fit ​​element 4411 disengages from the snap-fit ​​groove 2121, and at this time, the power shaft 4111 and the transmission shaft 212 can be axially separated.

[0162] As described above, this embodiment enables the torque shaft 210 to be axially and detachably connected to the power shaft 4111 by setting the snap-fit ​​positioning component 441 and the snap-fit ​​control component 442. Through the cooperation of the limiting block 2122 and the limiting groove 4113, the torque shaft 210 and the power shaft 4111 rotate coaxially. The motor outputs torque and drives the torque shaft 210 to rotate through the power shaft 4111.

[0163] A collection section 170 is provided on the handle body 100, covering the outer side of the proximal end of the conduit 200. The collection section 170 is used to collect plaque discharged from the conduit 200. The collection section 170 is detachably connected to the handle body 100, and the proximal end of the conduit 200 is detachably connected to the collection section 170. A buffer sleeve 270 is provided at the proximal end of the conduit 200, and a sealing groove 271 is provided on the buffer sleeve 270. The handle body 100 and the collection section 170 are respectively connected to the conduit 200 through the sealing groove 271.

[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 above-described technical solution of this embodiment, the doctor can replace the catheter 200 according to the actual usage situation. In specific operation, firstly, the collection section 170 is removed, and then the pull ring 4432 on the handle body 100 is pulled. The pull ring 4432 transmits the pulling force along the pull rope 4431 to the elastic element 4433, causing the movable end 4423 to move towards the fixed end 4422. During the movement of the movable end 4423, it gradually presses against the connecting end 4413, causing the raised connecting end 4413 to move towards the power shaft 4111. Under the linkage of the connecting end 4413, the snap-fit ​​member 4411 embedded in the snap-fit ​​groove 2121 gradually disengages from the snap-fit ​​groove 2121. When the snap-fit ​​member 4411 is completely disengaged from the snap-fit ​​groove 2121, the operator can axially remove the torque shaft 210 from the power shaft 4111.

[0170] When installing the new torque shaft 210, first pull the pull ring 4432, then insert the torque shaft 210 into the insertion slot 4112, then release the pull ring 4432, and after confirming that the snap-fit ​​part 4411 is snapped into the snap-fit ​​slot 2121, install the collection part 170 on the handle body 100.

[0171] This embodiment adopts a replaceable catheter 200 design, which improves the flexibility and economy of the operation, avoids the inability of plaque or thrombus to be discharged from the blood vessel in time due to the blockage of the catheter 200, and avoids causing distal embolism, thus ensuring the patient's life safety.

[0172] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the 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 torque shaft is connected to the cutter head assembly, the handle body is provided with a driving mechanism for driving the torque shaft to rotate, and the catheter is detachably connected to the driving mechanism; The driving mechanism comprises a driving module arranged in the handle body, the driving module comprises a power shaft, a power source for driving the power shaft to rotate, and a power supply assembly, and the catheter is detachably connected to the power shaft through a connecting module; The proximal end of the torque shaft is provided with a transmission shaft, the distal end of the power shaft is provided with a plug-in slot, the transmission shaft is plugged into the plug-in slot and rotates synchronously with the power shaft; the transmission shaft is provided with a clamping groove, the connecting module comprises a clamping positioning assembly clamped with the clamping groove and a clamping control assembly for controlling the clamping positioning assembly, and the clamping positioning assembly comprises a clamping piece arranged on the power shaft and clamped with the clamping groove; The clamping control assembly comprises a shaft sleeve arranged on the handle body, a fixed end arranged in the shaft sleeve, a movable end movably connected with the shaft sleeve, and a clamping control piece, the clamping control piece comprises an elastic piece connected with the fixed end and the movable end, and a pull rope for controlling the position of the movable end; When the operator pulls the pull rope, the movable end extrudes the connecting end, so that the connecting end moves towards the direction of the power shaft, and the head end of the clamping piece is separated from the clamping groove, and the power shaft is separated from the transmission shaft.

2. The resection device of claim 1, wherein, The clamping positioning assembly further comprises a positioning piece movably connected to the power shaft and used for positioning the clamping piece, and a connecting end connected to the clamping control assembly and the clamping piece, the clamping control assembly controls the clamping piece to be clamped with or separated from the clamping groove by controlling the connecting end.

3. The resection device of claim 2, wherein, The clamping control assembly further comprises a clamping control piece for controlling the movement of the movable end, the power shaft is connected to the transmission shaft after passing through the fixed end and the movable end, and the movable end is arranged between the positioning piece and the connecting end.

4. The resection device of claim 3, wherein, The fixed end is a fixed bearing connected with the power shaft, the movable end is a sliding block slidably connected with the shaft sleeve in the axial direction of the shaft sleeve, the elastic piece is connected between the fixed bearing and the sliding block, and the pull rope is used to control the position of the sliding block.

5. The resection device of claim 4, wherein, The end of the pull rope is provided with a pull ring, the connecting end is integrally connected with the clamping piece, the proximal end of the connecting end is raised, and the sliding block slides between the connecting end and the clamping piece.

6. The resection device of claim 1, wherein, The handle body is provided with a collecting part, the collecting part is detachably connected to the handle body and covers the outside of the proximal end of the catheter, the proximal end of the catheter is detachably connected to the collecting part, the proximal end of the catheter is provided with a buffer seat, the buffer seat is provided with a sealing groove, and the handle body and the collecting part are connected to the catheter through the sealing groove respectively.

7. The resection device of claim 1, wherein, The tool head assembly comprises a limiting seat connected to the catheter and a rotary cutting tool head arranged on the limiting seat, the rotary cutting tool head is fixedly connected to one end of the torque shaft, the torque shaft drives the rotary cutting tool head to rotate and connect to the limiting seat, and a protective sleeve is arranged on the limiting seat and covers the side surface of the rotary cutting tool head.

8. The resection device of claim 1, wherein, 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.

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