Supporting structure of flexible shaft and surgical instrument with supporting structure

Abstract

The utility model discloses a supporting structure of a flexible shaft and a surgical instrument with the supporting structure. The supporting structure of the flexible shaft is suitable for being installed in the surgical instrument, the surgical instrument is provided with a bending area, the flexible shaft comprises a flexible part installed in the bending area, the supporting structure of the flexible shaft comprises a supporting piece, the supporting piece is arranged on the periphery of the flexible part in a sleeving mode, and the supporting piece can be bent along with the flexible part. According to the supporting structure, the flexible shaft can be reliably supported and limited, the flexible shaft can overcome vibration generated by disturbance in the high-speed rotating process, abrasion between the flexible shaft and the outer pipe is avoided, the stability of the flexible shaft is improved, and the service life is prolonged.

Description

Technical Field

[0001] The utility model generally relates to the technical field of surgical tools, and in particular to a flexible shaft support structure and a surgical instrument having the same. Background Art

[0002] Excess body tissue can lead to pathological conditions and pain, especially when it affects the nervous system. For example, excessive bone growth in the spine or nerve root canals leads to neurological deficits and bulging or herniated discs. When undergoing surgical treatment, it is usually necessary to cut or remove some of the unwanted tissue. In practice, the unwanted tissue is often located in difficult-to-reach locations, and the surgical procedure requires selective removal of tissue while avoiding damage to surrounding tissue (such as the dural sac and / or dural nerves that may be fragile or vulnerable). Therefore, it is necessary to select surgical instruments that are easy to operate and have excellent stability to ensure that they can selectively cut / remove / remove difficult-to-reach tissue while reducing damage to surrounding tissue.

[0003] The commonly used bending grinding head is a tool for grinding on complex spatial curved surfaces. It can adjust the bending angle and direction according to different needs to adapt to different cutting positions and obstacle shapes. However, the bending part of the existing bending grinding head using a flexible shaft generally directly exposes the flexible shaft directly to the outer tube. At the same time, in order to ensure flexible adjustment on site, there are few limits on the flexible shaft, which is easy to generate unnecessary vibrations during operation due to the high-speed disturbance of the flexible shaft. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a support structure for a flexible shaft and a surgical instrument having the same, by which the support member is sleeved on the flexible part of the flexible column to effectively limit the position of the flexible shaft, avoid unnecessary vibration of the flexible shaft when rotating at high speed, and improve the stability of the flexible shaft.

[0005] In a first aspect, the utility model provides a support structure of a flexible shaft, the support structure of the flexible shaft is suitable for being installed in a surgical instrument, the surgical instrument has a bending area, the flexible shaft includes a flexible portion installed in the bending area, and the support structure of the flexible shaft includes:

[0006] The support member is sleeved on the outer periphery of the flexible portion, and the support member can be bent along with the flexible portion.

[0007] As an optional solution, the support member includes a main body, a mounting hole is opened through the main body along the length direction, the flexible part is installed in the mounting hole, and a plurality of first avoidance grooves are opened on the outer peripheral surface of the main body. The plurality of first avoidance grooves are arranged at intervals along the length direction of the main body, and each first avoidance groove is opened around the circumference of the main body.

[0008] As an optional solution, a second avoidance groove is opened inside the main body, the second avoidance groove is located on the inner wall of the mounting hole, the second avoidance groove is recessed in a direction away from the center of the mounting hole and is arranged around the circumference of the mounting hole.

[0009] As an optional solution, a transition area is provided between the groove wall of the second avoidance groove and the body, and the transition area is in an arc structure;

[0010] The groove wall of the second avoidance groove is an arc surface, which protrudes toward the center line of the mounting hole. The groove width of the second avoidance groove gradually increases from the groove bottom of the second avoidance groove to the groove mouth of the second avoidance groove, and the groove wall of the second avoidance groove is configured as a transition area.

[0011] As an optional solution, the curvature radius of the body is the same as the curvature radius of the flexible portion.

[0012] As an optional solution, an avoidance surface is formed on at least one side of the outer peripheral surface of the main body, and the avoidance surface is extended from the length direction of the main body. The avoidance surface is used to define a channel between the main body and the installation inner tube.

[0013] As an optional solution, the support member includes a spiral tube, and the spiral tube is sleeved on the outside of the flexible part.

[0014] As an optional solution, the spiral direction of the spiral tube is opposite to the rotation direction of the flexible portion.

[0015] As an optional solution, the support member includes a heat shrinkable sheath, which is sleeved on the outer periphery of the flexible portion and fixed to the outer peripheral surface of the flexible portion after being heated and shrunk.

[0016] As an optional solution, the flexible shaft further includes a rigid part, and the supporting structure further includes a wear-resistant sleeve arranged on the outer periphery of the rigid part, and the wear-resistant sleeve is made of polyvinyl fluoride or polyvinylidene fluoride.

[0017] As an optional solution, the support structure further includes an installation inner tube, and the flexible shaft is installed in the installation inner tube and a cavity is formed between the flexible shaft and the installation inner tube.

[0018] As an optional solution, a accommodating groove is opened inside the installation inner tube, and the accommodating groove is recessed from the inner wall of the installation inner tube toward a direction away from the center of the installation tube. The wear-resistant sleeve is installed inside the accommodating groove, and a positioning protrusion is formed on the side wall of the accommodating groove toward the inside of the accommodating groove. The positioning protrusion is in conflict with the side wall of the wear-resistant sleeve, and a gap is formed between the accommodating groove and the wear-resistant sleeve.

[0019] In a second aspect, the utility model provides a surgical instrument, comprising the support structure of the flexible shaft of the first aspect.

[0020] As an optional solution, it also includes a handle, an outer tube is installed on the handle, a tissue removal head is installed at one end of the outer tube, a bending area and a straight area are provided on the outer tube, a flexible shaft is installed inside the outer tube, the flexible part of the flexible shaft is correspondingly installed on the bending part, and the rigid part of the flexible shaft is correspondingly installed on the straight part, and the flexible shaft is drivingly connected to the tissue removal head.

[0021] The support structure of the flexible shaft of the utility model is provided with a support member, which is sleeved on the outer periphery of the flexible part, and the support member can bend along with the flexible part. By sleeved on the flexible part of the flexible column, the position of the flexible shaft is effectively limited, and unnecessary vibration of the flexible shaft is avoided when the flexible shaft rotates at high speed, thereby improving the stability of the flexible shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0023] Figure 1 This is a schematic diagram of the external structure of a surgical instrument according to an embodiment of the utility model;

[0024] Figure 2 This is a structural schematic diagram of a type of support member in a flexible support structure of an embodiment of the utility model;

[0025] Figure 3 This is a schematic diagram of the external structure of a surgical instrument according to another embodiment of the utility model;

[0026] Figure 4 for Figure 3 A partial enlarged view of B in the middle;

[0027] Figure 5 This is a structural schematic diagram of a flexible support structure of another embodiment of the utility model;

[0028] Figure 6 A schematic diagram of the external structure of a surgical instrument according to another embodiment of the utility model;

[0029] Figure 7 This is a structural schematic diagram of a support structure of a flexible shaft according to another embodiment of the present utility model ( Figure 6 (partial enlargement of C in the middle);

[0030] Figure 8 This is a structural schematic diagram of a support structure of a flexible shaft according to another embodiment of the present utility model ( Figure 1 Partial enlargement of A in the middle);

[0031] Fig. 9 It is a cross-sectional view of a rigid part support structure of a flexible shaft of the utility model;

[0032] Fig.10 This is a schematic structural diagram of a surgical instrument according to another embodiment of the present utility model;

[0033] Fig.11 for Fig.10 A partial enlarged view of D in the middle;

[0034] Fig.12 The figure is a cross-sectional schematic diagram of a surgical instrument according to an embodiment of the present utility model.

[0035] Fig.13 It is a cross-sectional schematic diagram of a handle in a surgical instrument of the utility model;

[0036] Fig.14 This is a schematic diagram of the structure of a positioning column of a shock-absorbing member on a handle in a surgical instrument of the utility model;

[0037] Fig.15 This is a structural schematic diagram of a shock absorbing component in a surgical instrument of the utility model;

[0038] Fig.16 This is a schematic diagram of the structure of a sliding bearing in a surgical instrument of the utility model;

[0039] Fig.17 It is another structural schematic diagram of a sliding bearing in a surgical instrument of the utility model;

[0040] Fig.18 This is a schematic diagram of the structure of a sealing member in a handle of a surgical instrument of the utility model;

[0041] Fig.19 This is a schematic diagram of the structure of the mounting cavity in the handle of a surgical instrument of the utility model;

[0042] Fig. 20 The utility model is a schematic diagram of the connection structure between the flexible shaft in the handle and the power input shaft in a surgical instrument.

[0043] In the figure,

[0044] 100. Surgical instrument, 110. Outer tube, 1101. Side hole, 1111. First bending area, 1112. Second bending area, 1113. Third bending area, 1114. Fourth bending area, 1115. Fifth bending area, 1116. Sixth bending area, 1117. Seventh bending area, 1118. Eighth bending area, 1119. Ninth bending area, 1120. Tenth bending area, 1121. Eleventh bending area, 120. Flexible shaft, 121. Flexible part, 122. Rigid part, A1. Distal end, A2. Proximal end, 130. Tissue removal head, 131. Tissue removal head mounting seat, 132. Connecting shaft, 133. Sheath;

[0045] 211. body, 212. mounting hole, 213. first avoidance groove, 214. second avoidance groove, 215. transition area, 216. avoidance surface;

[0046] 250, installing inner tube, 251, containing groove, 252, positioning protrusion, 253, gap;

[0047] 300, handle;

[0048] 310, mounting cavity, 311, annular groove, 312, first mounting groove, 313, second mounting groove, 314, step, 315, support ring, 316, friction inner sleeve;

[0049] 320, shock absorbing member, 321, mounting ring, 322, support column, 323, sliding bearing, C1, inner ring, C2, outer ring, 3231, elastic supporting member, 3232, gap, 3234, elastic ring, 3235, first clearance groove;

[0050] 330, positioning column, 331, positioning hole;

[0051] 340, sealing member, B1, inner wall, B2, outer wall, 341, first protrusion, 342, second protrusion;

[0052] 350, positioning bearing, 351, positioning retaining spring;

[0053] 400, transmission shaft, 410, transmission pin mounting hole, 420, transmission pin, 430, elastic member;

[0054] 500, motor front fork, 501, long hole. DETAILED DESCRIPTION

[0055] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It is also necessary to explain that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings.

[0056] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0057] Based on the above problems, the present application provides a surgical instrument 100, such as Figure 1-20As shown, the surgical instrument 100 includes an outer tube 110, a flexible shaft 120 and a tissue removal head 130. The outer tube 110 has a bending area and a straight area. The flexible shaft 120 is installed in the housing. The flexible shaft 120 has a flexible portion 121 and a rigid portion 122. The flexible portion 121 is installed in the bending area, and the rigid portion 122 is installed in the straight area. The distal end of the flexible shaft 120 is drivingly connected to the tissue removal head 130. The surgical instrument 100 also includes:

[0058] A support structure 200 of the flexible shaft, the support structure comprising a support member, the support member is sleeved on the outer periphery of the flexible portion 121, and the support member can be bent along with the flexible portion 121;

[0059] The handle 300 includes:

[0060] The installation cavity 310 is provided with a power input shaft, and the proximal end of the flexible shaft 120 is drivingly connected to the power input shaft;

[0061] The shock absorber 320 is arranged inside the installation cavity 310. The shock absorber 320 includes a mounting ring 321 and a sliding bearing 323. The mounting ring 321 and the sliding bearing 323 are arranged in sequence along the axis of the installation cavity 310 toward the direction of the power input shaft. The mounting ring 321 and the sliding bearing 323 are sleeved on the flexible shaft 120 and are loosely matched with the flexible shaft 120. The inner ring C1 of the sliding bearing 323 is loosely matched with the flexible shaft 120, and the gap between the inner ring C1 of the sliding bearing 323 and the flexible shaft 120 is smaller than the gap between the mounting ring 321 and the flexible shaft 120.

[0062] It should be noted that the surgical instrument 100 can be any tool used to remove, dislodge or cut target tissue during surgery, and can perform grinding processing on complex spatial surfaces. In actual use, the bending angle and direction can be adjusted according to different needs to adapt to different cutting positions and directions of target tissues, such as but not limited to a curved grinding head.

[0063] In some embodiments, Figure 1 , 2As shown in FIG. 12 , the surgical instrument 100 includes an outer tube 110, a flexible shaft 120, a tissue removal head 130 and a handle 300. The outer tube 110 is mounted on the handle 300. According to the distance from the handle 300, the outer tube 110 has a proximal end A2 and a distal end A1. The distal end A1 of the outer tube 110 is provided with the tissue removal head 130. The flexible shaft 120 serves as a driving shaft for driving the tissue removal head 130. The flexible shaft 120 is mounted inside the outer tube 110. The proximal end of the flexible shaft 120 is arranged inside the handle 300 to connect with the driving component. The distal end of the flexible shaft 120 is connected to the tissue removal head 130. The drive connection is used to drive the tissue removal to rotate at a high speed under the drive of the driving component; wherein the outer tube 110 has a straight area and a bending area, the bending area has at least two, recorded as the first bending area 1111, the second bending area 1112, ..., the Nth bending area, N is an integer greater than 2, the straight area has at least one, recorded as the first straight area, ..., the Mth straight area, M is an integer greater than 1, the straight area is arranged between two adjacent bending areas, the bending area near the proximal end A2 of the outer tube 110 can be at least one, and the bending area near the distal end A1 of the outer tube 110 can be The bending direction of the bending zone near the proximal end A2 of the outer tube 110 is opposite to the bending direction of the bending zone near the distal end A1 of the outer tube 110; for example, the first bending zone 1111 is located in the area near the proximal end A2 of the outer tube 110, and the second bending zone 1112 is located in the area near the distal end A1 of the outer tube 110, and the bending directions of the first bending zone 1111 and the second bending zone 1112 are opposite; correspondingly, the flexible shaft 120 has a flexible portion 121 and a rigid portion 122, the flexible portion 121 has at least two, the rigid portion 122 has at least one, and the flexible portion 121 corresponds to Located in the bending area, the rigid part 122 is correspondingly located in the straight line area. It should be noted that the bending area can be set in a position to better avoid normal tissue and reduce secondary damage to the patient, while ensuring that the bending area is set in a position to avoid blocking the operator's better operating field of view; through such a setting, when using the surgical instrument 100, the operator holds the handle 300, bends the appearance in advance according to the predetermined angle and direction, and the flexible shaft 120 rotates at a high speed inside the outer tube 110 under the drive of the driving component, so as to transmit torque to drive the tissue removal head 130 to rotate to complete the excision, removal or cutting of the tissue.

[0064] It can be understood that due to the structure of the flexible shaft 120 itself, it is easy to deform, and the support structure 200 of the flexible shaft can better support the flexible shaft 120 and overcome the vibration generated during the high-speed rotation of the flexible shaft 120; wherein, the support structure 200 of the flexible shaft can be set on the flexible part 121 of the flexible shaft 120, and can also be set on the rigid part 122 of the flexible shaft 120, and of course can also be set on the flexible part 121 and the rigid part 122 of the flexible shaft 120 at the same time.

[0065] In some embodiments, since the flexible portion 121 of the flexible shaft 120 needs to bend at multiple angles and directions, it is more prone to vibration during high-speed rotation. Therefore, the support structure 200 of the flexible shaft is set on the flexible portion 121. The support structure 200 of the flexible shaft includes a support member, which is sleeved on the outer periphery of the flexible portion 121 and can bend as the flexible portion 121 bends. On the one hand, the support member can isolate the flexible shaft 120 and the outer tube 110 to prevent the flexible shaft 120 from wearing against the outer tube 110 during high-speed rotation. On the other hand, the stability and driveability of the flexible shaft 120 can be ensured.

[0066] The support member may be made of any material with good wear resistance and self-lubricating properties, such as but not limited to polyvinyl fluoride, polyvinylidene fluoride or rubber, etc., as long as it can ensure reliable support of the flexible shaft 120 .

[0067] It can also be understood that the handle 300 is provided with an installation cavity 310, which is mainly used to provide space for connecting the power input shaft of the flexible shaft 120. The connection between the power input shaft and the flexible shaft 120 needs to ensure, on the one hand, reliable driving of the flexible shaft 120 to rotate at high speed; on the other hand, it needs to ensure that no vibration is generated due to the disturbance of the flexible shaft 120 during the rotation of the flexible shaft 120, thereby ensuring the operational stability of the handle 300; on the other hand, since the surgical instrument 100 usually needs to input cooling liquid when removing, removing or cutting the target tissue, such as but not limited to physiological saline, a sealing structure is usually provided at the connection between the flexible shaft 120 and the power input shaft to ensure good sealing and avoid failure of the handle 300.

[0068] The shock absorber 320 is sealed and arranged in the installation cavity 310, so as to ensure that the installation of the shock absorber 320 will not damage the sealing of the connection between the flexible shaft 120 and the power input shaft; Fig.15 As shown, the setting of the mounting ring 321 and the support column 322 is conducive to ensuring that the flexible shaft 120 will first contact the mounting ring 321 to cause disturbance when generating radial movement, and the mounting ring 321 will transmit the disturbance to the support column 322. The gaps between the support columns 322 are arranged so that the support columns 322 have a certain elasticity and can be deformed. The deformation of the support column 322 can absorb the disturbance of the flexible shaft 120, thereby preventing the disturbance of the flexible shaft 120 from causing instability of the handle 300 and sealing failure.

[0069] Furthermore, if Fig.15 As shown, the shock absorber further includes a plurality of support columns 322, which are located at the outer periphery of the mounting ring 321 and are arranged at intervals along the circumference of the mounting ring 321, and gaps are formed between the plurality of support columns 322;

[0070] A side hole is also formed on the side of the handle 300 , and the side hole is connected to the gap formed between the plurality of support columns 322 .

[0071] Among them, the support columns 322 include at least two, and the support columns 322 extend vertically from one side end face of the mounting ring 321 toward a direction away from the end face of the mounting ring 321. At least two support columns 322 are arranged at intervals, and the support columns 322 are arranged at intervals so that a gap is defined between the support columns 322. On the one hand, the gap is conducive to ensuring that the cooling liquid flows into the flow channel in the outer tube 110, and on the other hand, it is conducive to the support column 322 to deform to absorb the disturbance of the flexible shaft 120 and protect the stability and sealing of the handle 300; and the sliding bearing 323 is conducive to further reducing the disturbance of the flexible shaft 120 on the basis of the mounting ring 321 and the support column 322, ensuring the stability of the handle 300, and at the same time, the sliding bearing 323 can also avoid its concentration in one position to reduce the life of a single part.

[0072] The surgical instrument 100 of the embodiment of the present application solves the problems of the prior art surgical instrument 100 that the flexible shaft 120 is unstable and prone to wear during high-speed rotation, and the handle 300 has poor operational stability. The surgical instrument 100 of the embodiment of the present application is provided with a support structure 200 of the flexible shaft, the support structure includes a support member, the support member is sleeved on the outer periphery of the flexible part 121, and the support member can bend with the flexible part 121; the handle 300, the handle 300 includes: a mounting cavity 310, a power input shaft is arranged in the mounting cavity 310, and the proximal end of the flexible shaft 120 is drivingly connected to the power input shaft; a shock absorber 320, which is arranged inside the mounting cavity 310, and the shock absorber 320 includes a mounting ring 321 and a plurality of support columns 322, the mounting ring 321 is sleeved on the flexible shaft 120 and is in clearance fit with the flexible shaft 120, and the plurality of support columns 322 are located on the outer periphery of the mounting ring 321 and are arranged at intervals along the circumference of the mounting ring 321. The support member can reliably support the flexible portion 121 of the limited flexible shaft 120, thereby avoiding vibration caused by disturbance during high-speed rotation and improving the stability of the flexible shaft 120; through the mounting ring 321 and the support column 322 of the shock absorber 320, when the flexible shaft 120 generates radial movement, it will conflict with the mounting ring 321 to cause disturbance and transmit it to the support column 322. The support columns 322 arranged at intervals can effectively absorb the disturbance generated, thereby ensuring the stability and sealing of the handle 300.

[0073] As an achievable method, Figure 2As shown, the support member includes a main body 211, and a mounting hole 212 is opened through the main body 211 along the length direction. The flexible part 121 is installed in the mounting hole 212, and a plurality of first avoidance grooves 213 are opened on the outer peripheral surface of the main body 211. The plurality of first avoidance grooves 213 are arranged at intervals along the length direction of the main body 211, and each first avoidance groove 213 is opened around the circumference of the main body 211.

[0074] The main body 211 in this embodiment can be made of materials with good wear resistance and self-lubricating properties such as polyvinyl fluoride and polyvinylidene fluoride, or elastic materials such as rubber; the mounting hole 212 is used for the flexible shaft 120 to pass through, and the first avoidance groove 213 is conducive to the bending of the main body 211 to ensure that when the flexible part 121 bends, stress concentration will not occur to cause the main body 211 to break. At the same time, when the main body 211 is bent, the inner side is compressed to allow the first avoidance groove 213 to avoid excessive extrusion of the main body 211 to produce wrinkles, which will increase the friction resistance between the inner wall of the main body 211 and the flexible shaft 120. Furthermore, the first avoidance groove 213 can also reduce the force on the inner tube 250 when it is bent.

[0075] In some embodiments, a second avoidance groove 214 is opened inside the body 211 . The second avoidance groove 214 is located on the inner wall of the mounting hole 212 . The second avoidance groove 214 is recessed in a direction away from the center of the mounting hole 212 and is arranged around the circumference of the mounting hole 212 .

[0076] In a preferred embodiment, the second avoidance groove 214 is located in the middle of the main body 211 in the length direction.

[0077] In this embodiment, the second avoidance groove 214 divides the interior of the mounting hole 212 into two sections, effectively avoiding stress concentration that causes the shape of the inner wall of the mounting hole 212 to change and increase the rotational friction with the flexible shaft 120, thereby ensuring smooth rotation of the flexible shaft 120.

[0078] In some embodiments, a transition area 215 is provided between the groove wall of the second avoidance groove 214 and the body 211 , and the transition area 215 is in an arc structure.

[0079] The arc transition structure in this embodiment can specifically be a rounded transition between the slot opening of the second avoidance slot 214 and the main body 211 . Of course, the slot wall of the entire second avoidance slot 214 can also be set to an arc knot, which is beneficial to the smooth rotation of the flexible shaft 120 .

[0080] In a preferred embodiment, the groove wall of the second avoidance groove 214 is an arc surface, which protrudes toward the center line of the mounting hole 212. The groove width of the second avoidance groove 214 gradually increases from the groove bottom of the second avoidance groove 214 to the groove mouth of the second avoidance groove 214, and the groove wall of the second avoidance groove 214 is configured as a transition area 215.

[0081] In some embodiments, the curvature radius of the body 211 is the same as the curvature radius of the flexible portion 121. The body 211 is bent into an arc shape, and the curved profile is completely consistent with the curved profile of the flexible portion 121, ensuring reliable rotation of the flexible shaft 120.

[0082] In some embodiments, a relief surface 216 is formed on at least one side of the outer circumferential surface of the body 211 . The relief surface 216 extends from the length direction of the body 211 . The relief surface 216 is used to define a channel between the body 211 and the outer tube 110 .

[0083] In this embodiment, the channel defined between the avoidance surface 216 and the outer tube 110 is conducive to ensuring the circulation of cooling liquid.

[0084] For example, Figure 3 As shown, the distal end A1 of the outer tube 110 is provided with a third bending area 1113, and the distal end A1 of the outer tube 110 is provided with a fourth bending area 1114 and a fifth bending area 1115 in sequence on the side of the third bending area 1113 close to the proximal end A2 of the outer tube 110, the third bending area 1113, the fourth bending area 1114 and the fifth bending area 1115 have the same bending direction, the flexible portion 121 of the flexible shaft 120 is correspondingly located in the third bending area 1113, the fourth bending area 1114 and the fifth bending area 1115, the rigid portion 122 of the flexible shaft 120 is provided in the straight area of ​​the outer tube 110, the rigid portion 122 is provided between the third bending area 1113 and the fourth bending area 1114, and the distance between the fourth bending area 1114 and the fifth bending area 1115 is relatively close, as shown in FIG. Figure 4 and Figure 5 As shown, the straight section between the two flexible parts 121 is not provided with a rigid part 122, but the body 211 is directly sleeved on the flexible shaft 120. The first avoidance groove 213 on the body 211 can make the body 211 deform as the outer tube 110 is bent, so as to complete the fixation during rotation. In this way, the flexible shaft 120 rotates in the outer tube 110 to transmit the torque to drive the tissue removal head 130 to rotate and complete the removal of the tissue. Among them, the third bending area 1113, the fourth bending area 1114, and the fifth bending area 1115 are bent in the same direction to obtain a larger bending radius and angle to better avoid normal tissue and reduce secondary damage to the patient, while avoiding blocking to provide the operator with a better operating field of view. The bending angle of the third bending area 1113 can be 0°-45°, the bending angle of the fourth bending area 1114 can be 0°-45°, and the bending angle of the fifth bending area 1115 can be 0°-45°.

[0085] As other possible ways, such as Figure 6 and Figure 7As shown, the support member includes a spiral tube 220 , and the spiral tube 220 is sleeved on the outside of the flexible portion 121 .

[0086] Among them, the spiral tube 220 can be a spiral spring or a spirally packed metal tube, and both ends of the spiral tube 220 can be fixed to the rigid part 122 by any means, such as but not limited to welding; of course, the spiral tube 220 can also be formed integrally with the rigid part 122 by laser cutting or wire cutting.

[0087] In a preferred embodiment, the spiral direction of the spiral tube 220 is opposite to the rotation direction of the flexible portion 121 .

[0088] In this embodiment, the spiral tube 220 can rotate synchronously with the rotation of the flexible shaft 120, which is beneficial to reducing the friction caused by the relative movement of the flexible shaft 120 during rotation. At the same time, the spiral direction of the spiral tube 220 is opposite to the rotation direction of the flexible shaft 120, which is beneficial to obtain good torque transmission by being squeezed during rotation and reduce the spiral shape that appears during rotation, thereby ensuring the stability of the transmission of the flexible shaft 120; further, the spiral gap of the spiral tube 220 can allow the cooling liquid to flow better in the spiral tube 220 section, thereby obtaining a better lubrication effect.

[0089] For example, Figure 6 As shown, the distal end A1 of the outer tube 110 is provided with an eighth bending zone 1118, the proximal end A2 of the outer tube 110 is provided with a sixth bending zone 1116 and a seventh bending zone 1117, the eighth bending zone 1118 and the sixth bending zone 1116 have opposite bending directions, the seventh bending zone 1117 and the sixth bending zone 1116 have opposite bending directions, the eighth bending zone 1118 and the seventh bending zone 1117 have the same bending direction, the flexible portion 121 of the flexible shaft 120 is correspondingly located in the sixth bending zone 1116, the seventh bending zone 1117, and the eighth bending zone 1118, the rigid portion 122 of the flexible shaft 120 is provided in the straight area of ​​the outer tube 110, and the rigid portion 122 is provided between the third bending zone 1113 and the fourth bending zone 1114 of the flexible shaft 120, as shown in FIG. Figure 7As shown, a spiral tube 220 is sleeved on the flexible portion 121, and the spiral tube 220 can rotate synchronously with the rotation of the flexible shaft 120, which is beneficial to reducing the friction caused by the relative movement of the flexible shaft 120 during rotation. At the same time, the spiral direction of the spiral tube 220 is opposite to the rotation direction of the flexible shaft 120, which is beneficial to obtain good torque transmission when squeezed during rotation and reduce the spiral shape that appears during rotation, thereby ensuring the stability of the transmission of the flexible shaft 120; further, the spiral gap of the spiral tube 220 can allow the cooling liquid to flow better in the spiral tube 220 section to obtain a better lubrication effect. Among them, the same-direction bending setting of the eighth bending area 1118 and the seventh bending area 1117 can better avoid normal tissues and reduce secondary damage to patients, and can also provide the operator with more operating angles to ensure that the operator can choose a more comfortable operating posture. The bending angle of the sixth bending zone 1116 may be 0°-90°, the bending angle of the seventh bending zone 1117 may be 0°-90°, and the bending angle of the eighth bending zone 1118 may be 0°-90°.

[0090] As other possible ways, such as Figure 8 As shown, the support member includes a heat shrinkable sheath 230 , which is sleeved on the outer periphery of the flexible portion 121 and fixed to the outer peripheral surface of the flexible portion 121 after being heated and shrunk.

[0091] The heat shrinkable sheath 230 may be made of a material such as polyvinyl fluoride or polyvinylidene fluoride that has good wear resistance, self-lubricity and heat shrinkability.

[0092] In this embodiment, the heat shrinkable sheath 230 can, on the one hand, reduce the wear of the flexible portion 121, protect the flexible shaft 120, maintain lubrication, reduce the friction heat and noise of the flexible shaft 120, and extend the service life of the flexible shaft 120; on the other hand, the heat shrinkable sheath 230 can reduce collisions and reduce tension and pressure, alleviate the impact and deformation of the flexible shaft 120 during transmission, and improve the transmission efficiency and stability of the flexible shaft 120; on the other hand, the heat shrinkable sheath 230 has a guiding and supporting effect on the flexible shaft 120, so that the flexible shaft 120 maintains a certain direction and position in a bent state.

[0093] In actual processing, each section of the rigid part 122 of the flexible shaft 120 is set to a length of not less than 30 mm, and at both ends of each flexible part 121, at least a length of not less than 5 mm is set at the unbent straight end. The heat shrinkable sheath 230 is put on the flexible part 121, and then the heat shrinkable sheath 230 is heated for thermal fixation. After completion, the two ends of the flexible part 121 are inserted into the rigid part 122 until the rigid part 122 is just washed and the two end surfaces of the heat shrinkable sheath 230 are abutted.

[0094] In other embodiments, Figure 4-8As shown, the support structure further includes a wear-resistant sheath 240 disposed on the outer periphery of the rigid portion 122 . The wear-resistant sheath 240 is made of polyvinyl fluoride, polyvinylidene fluoride, brass or stainless steel.

[0095] Furthermore, in the length direction, the two end faces 241 of the wear-resistant sheath 240 are flat and the middle part is concave inwards. Specifically, the wear-resistant sheath 240 is waist-shaped.

[0096] It is understandable that in actual processing, the multiple flexible parts 121 of the flexible shaft 120 can be respectively provided with the above-mentioned support members, and at the same time, the rigid part 122 is externally sleeved with a wear-resistant sheath 240 to further improve the stability of the flexible shaft 120 .

[0097] In other embodiments, Figure 5 As shown, the support structure further includes an installation inner tube 250 , which is installed in the outer tube 110 , and the flexible shaft 120 is installed in the installation inner tube 250 and a cavity is formed between the flexible shaft 120 and the installation inner tube 250 .

[0098] Furthermore, if Fig. 9 As shown, a receiving groove 251 is opened inside the installation inner tube 250, and the receiving groove 251 is recessed from the inner wall of the installation inner tube 250 toward a direction away from the center of the installation inner tube 250. The wear-resistant sleeve 240 is installed inside the receiving groove 251. The side wall of the receiving groove 251 forms a positioning protrusion 252 toward the inside of the receiving groove 251. The positioning protrusion 252 conflicts with the side wall of the wear-resistant sleeve 240, and a gap 253 is formed between the receiving groove 251 and the wear-resistant sleeve 240.

[0099] In this embodiment, by setting the inner tube 250 and the wear-resistant sleeve 240, the flexible shaft 120 is further reliably supported, ensuring that the flexible shaft 120 has good stability when rotating at high speed. In addition, there is a cavity between the inner tube 250 and the flexible shaft 120, which is used to be filled with cooling liquid or liquid medicine. The cooling liquid or liquid medicine can be discharged and injected through the inlet and outlet liquid channels set on the operating handle 300. The receiving groove 251 opened on the inner tube 250, the upper and lower end faces 241 of the wear-resistant sleeve 240 and the receiving groove 251 form a gap 253, which can be used for the circulation of cooling liquid and liquid medicine to ensure its lubrication and cooling effect. Among them, the positioning protrusion 252 is formed by extruding from the outer wall of the inner tube 250 toward the inside, and a groove appears on the outer wall of the inner tube 250. The positioning protrusion 252 and the two end faces of the wear-resistant sleeve are mainly used to position and fix the wear-resistant sleeve 240.

[0100] For example, Figure 1 and 8As shown, a first bending zone 1111 is provided at the proximal end A2 of the outer tube 110, and a second bending zone 1112 is provided at the distal end A1 of the outer tube 110. The bending directions of the first bending zone 1111 and the second bending zone 1112 are opposite. An inner tube 250 is installed inside the outer tube 110. The inner tube 250 is sleeved on the flexible shaft 120. A receiving groove 251 is provided on the inner wall of the inner tube 250. A wear-resistant sleeve 240 is installed inside the receiving groove 251. The wear-resistant sleeve 240 is sleeved on the rigid part 122 of the flexible shaft 120. A gap is formed between the wear-resistant sleeve 240 and the receiving groove 251 for the circulation of cooling liquid. A heat shrink sleeve 230 is provided outside the flexible part 121. The bending angle of the first bending zone 1111 can be 0°-75°, and the bending angle of the second bending zone 1112 can be 0°-105°.

[0101] Further, the flexible shaft 120 may include a core and at least one outer layer, the core including a bendable multi-stranded wire. According to some embodiments, the multi-stranded wire of the core may include three strands. According to some embodiments, the multi-stranded wire of the core may include seven strands. According to some embodiments, the multi-stranded wire of the core may include nineteen strands. According to some embodiments, the multi-stranded wire of the core may include more than nineteen strands. According to some embodiments, the strands of the multi-stranded wire may be braided, twisted, interlaced, or coiled. Each possibility is a separate embodiment.

[0102] Further, the flexible shaft 120 is configured to have high torsional stiffness and low bending stiffness, potentially enabling the flexible shaft 120 to rotate at high speeds when bent, even at a small radius of curvature. Having low bending stiffness provides low bending-related stresses and better resistance to fatigue caused by high rotational speeds and / or high rotational torques. According to some embodiments, the flexible shaft 120 can be made of stainless steel wires (also referred to herein as strands), which are twisted (braided or coiled) into a rope, forming a core. As a non-limiting example, the flexible shaft 120 can be made of seven 304V stainless steel wires (each having a diameter of, for example, 0.084 mm) twisted into a rope.

[0103] Several layers (e.g., 3 layers) can then be wound around the rope core. Each successive layer (e.g., coil) can optionally be wound in the opposite direction of the layer in front of it. As a non-limiting example, the first outer layer (the layer closest to the core) can include 5 wires (each of which has a diameter of, for example, 0.12 mm) that are coiled, twisted, or twisted in a first direction (e.g., clockwise), the middle layer can include 5 wires (each of which has a diameter of, for example, 0.14 mm) that are coiled, twisted, or twisted, for example, in the direction opposite to the first outer layer (e.g., counterclockwise), and the third outer layer can include 5 wires (each of which has a diameter of, for example, 0.16 mm) that are coiled, twisted, or twisted, for example, in the direction opposite to the middle outer layer.

[0104] According to some embodiments, the outer diameter of the flexible shaft 120 is, for example, 0.3 mm to 5 mm, such as 0.5 mm or 1 mm or 1.5 mm or 3 mm.

[0105] In some embodiments, a positioning groove is provided on the mounting ring 321, and a plurality of ridges are provided on the sidewall of the positioning groove at intervals along the circumferential direction. The sliding bearing 323 is installed inside the positioning groove, and the outer ring C2 of the sliding bearing 323 is tightly fitted with the ridges. This embodiment is conducive to facilitating the installation and fixation of the sliding bearing 323.

[0106] In some embodiments, such as Fig.16 As shown, the sliding bearing 323 has an inner ring C1 and an outer ring C2, and an elastic support member 3231 is connected between the inner ring C1 and the outer ring C2.

[0107] Furthermore, a gap 3232 is formed on the elastic supporting member 3231 .

[0108] Among them, there can be multiple elastic support members 3231, and multiple elastic members 430 are installed at intervals between the inner ring C1 and the outer ring C2. For example, the elastic support member 3231 can be N-shaped; of course, the elastic support member 3231 can also be a whole, as long as it can ensure that the elastic damping absorbs the vibration generated by the high-speed rotation of the flexible shaft 120.

[0109] It is understandable that the inner ring C1 and the outer ring C2 of the sliding bearing 323 can be made of self-lubricating plastic, stainless steel, titanium alloy, etc.; the elastic support member 3231 can be spring steel, elastic plastic, etc.

[0110] In this embodiment, when the flexible shaft 120 rotates at high speed and generates disturbance, the inner ring C1 of the sliding bearing 323 generates disturbance and the vibration generated is absorbed by the elastic damping of the elastic support member 3231 , thereby ensuring the stability of the handle 300 .

[0111] In other embodiments, Fig.17 As shown, elastic rings 3234 are respectively provided at both axial ends of the sliding bearing 323 , and a plurality of first clearance grooves 3235 are opened on the elastic ring 3234 along its circumference, and each first clearance groove 3235 extends from the edge of the elastic ring 3234 to the center of the elastic ring 3234 .

[0112] Furthermore, the first evacuation groove 3235 penetrates two opposite side surfaces of the elastic ring 3234 , and the extension direction of the first evacuation groove 3235 is inclined in an arc shape toward the tangent direction of the elastic ring 3234 .

[0113] The provision of the elastic ring 3234 in this embodiment is beneficial for the elastic ring 3234 to be squeezed and deformed at the position of the first clearance groove 3235 when the sliding bearing 323 is radially disturbed, so as to absorb the disturbance generated by the flexible shaft 120 and ensure the stability of the handle 300.

[0114] In some embodiments, Fig.14 and 19 As shown, the surgical instrument 100 also includes a positioning member, which includes a positioning column 330 and a positioning hole 331. The positioning column 330 is arranged to penetrate the outside of the handle 300, and the positioning hole 331 is arranged on the inner wall of the mounting cavity 310. One end of the positioning column 330 extends into the through hole at the corresponding position on the outer tube to limit the outer tube from rotating, and the other end of the positioning column 330 is limited in the positioning hole 330.

[0115] In actual processing, Fig.19 As shown, a side hole 1101 is opened on the side of the handle 300, and the side hole 1101 is connected to the installation cavity 310, which is used for the flow channel for the cooling liquid to flow into or out of the outer tube 110, and can ensure that the cooling liquid flows from the side hole 1101 through the gap of the support column 322.

[0116] As an achievable method, Fig.13 and 18 , Fig. 20 As shown, the handle 300 also includes: a seal 340, the seal 340 has an inner wall B1 and an outer wall B2, the inner wall B1 spacer ring is provided with a plurality of first protrusions 341, the flexible shaft 120 passes through the inner wall B1 and the flexible shaft 120 is interference fit with the plurality of first protrusions 341, the outer wall B2 spacer ring is provided with a plurality of second protrusions 342, and the second protrusions 342 are interference fit with the inner wall of the mounting cavity 310.

[0117] In this embodiment, by providing the first protrusion 341 and the second protrusion 342, the sealing fit between the seal 340, the flexible shaft 120 and the installation cavity 310 is effectively ensured. On the one hand, it is helpful to prevent the cooling liquid from flowing into the handle 300 and affecting the normal operation of the input shaft. On the other hand, the interference fit between the first protrusion 341 and the flexible shaft 120 can absorb vibration when radial disturbance occurs to the flexible shaft 120.

[0118] In some embodiments, the inner wall of the installation cavity 310 is provided with a plurality of annular grooves 311 spaced apart from each other. The annular grooves 311 are provided corresponding to the second protrusions 342 . When the seal 340 is installed in the installation cavity 310 , the annular grooves 311 and the second protrusions 342 cooperate with each other.

[0119] In this embodiment, the second protrusion 342 cooperates with the annular groove 311 , which is beneficial to ensure the stable installation of the sealing member 340 and improve the sealing effect of the sealing member 340 .

[0120] As an achievable method, Fig.13 As shown, the handle 300 also includes a locating bearing 350, which is located on the side of the seal 340 close to the power input shaft. The power input shaft includes a transmission shaft 400, which is installed on the inner ring of the locating bearing 350. The flexible shaft 120 passes through the transmission shaft 400 and the end of the flexible shaft 120 is transmission-connected to one end of the transmission shaft 400 away from the locating bearing 350.

[0121] Furthermore, if Fig.13 and 20 As shown, a transmission pin mounting hole 410 is formed at the end of the transmission shaft 400 , a through hole matching the transmission pin mounting hole 410 is formed at the end of the flexible shaft 120 , and a transmission pin 420 is mounted in the through hole and the transmission pin mounting hole 410 .

[0122] The provision of the positioning bearing 350 in this embodiment is conducive to ensuring reliable transmission connection between the flexible shaft 120 and the transmission shaft 400, ensuring high-speed rotation of the flexible shaft 120 while ensuring that the flexible shaft 120 does not wear.

[0123] In some embodiments, Fig.13 and 19 As shown, the inner wall of the installation cavity 310 is provided with a first installation groove 312 and a second installation groove 313, the first installation groove 312 and the second installation groove 313 are arranged adjacent to each other and a step 314 is formed at the connection of the first installation groove 312;

[0124] The shock absorber 320, the sealing member 340 and the positioning bearing 350 are sequentially installed inside the first installation groove 312, and the positioning sleeve of the positioning bearing 350 is located in the second installation groove 313, and the positioning bearing 350 and the step 314 are mutually limited;

[0125] A positioning spring 351 is disposed at one end of the positioning bearing 350 away from the sealing member 340 . The positioning spring 351 is fixedly mounted on the outside of the transmission shaft 400 . The positioning spring 351 and the positioning bearing 350 limit each other.

[0126] Among them, the first mounting groove 312 and the second mounting groove 313 are recessed from the inner wall of the mounting cavity 310 toward a direction away from the center of the mounting cavity 310, and the first mounting groove 312 and the second mounting groove 313 are extended along the circumference of the mounting cavity 310; the dimension of the first mounting groove 312 perpendicular to the length direction of the mounting cavity 310 is smaller than the dimension of the second mounting groove 313 perpendicular to the length direction of the mounting cavity 310, thereby forming a step 314 at the connection between the first mounting groove 312 and the second mounting groove 313.

[0127] In this embodiment, the first mounting groove 312 is conducive to providing installation space for the shock absorber 320 and the seal 340, and the second mounting groove 313 is used to install the motor front fork 500 and provide installation space for the drive shaft; the step 314 between the first mounting groove 312 and the second mounting groove 313 is mainly used to fix the locating bearing 350 in one direction to prevent the locating bearing 350 from moving, and the setting of the non-locating retaining spring 351 is used to fix the other end of the locating bearing 350 to ensure the stability of the locating bearing 350 and prevent it from moving.

[0128] In some embodiments, a positioning washer is disposed between the shock absorbing member 320 and the first mounting groove 312 , and the inner diameter of the positioning washer is greater than the outer diameter of the flexible shaft 120 .

[0129] In some embodiments, Fig.13 As shown, a support ring 315 is also provided in the first installation groove 312. The support ring 315 is located between the seal 340 and the positioning bearing 350, and a second clearance groove is opened at one end of the support ring 315 close to the positioning bearing 350. The second clearance groove is used to prevent the support ring 315 from interfering with the inner ring of the positioning bearing 350 and getting stuck.

[0130] The support ring 315 in this embodiment is used to install the positioning bearing 350, and the second clearance groove on the support ring 315 prevents the inner ring of the positioning bearing 350 from colliding with each other, resulting in increased friction and jamming.

[0131] In some embodiments, the inner ring of the support ring 315 is provided with a friction inner sleeve 316 , and the friction inner sleeve 316 is made of brass to prevent the inner ring of the positioning bearing from melting due to friction.

[0132] As a feasible method, the power input shaft also includes a driving shaft, a motor front fork 500 is installed in the second mounting groove 313, an elastic member 430 is sleeved on the transmission shaft 400, one end of the elastic member 430 in the length direction is abutted and connected with the positioning bearing 350, and the other end is connected with the motor front fork 500, and the elastic force of the elastic member 430 drives the motor front fork 500 to move axially along the transmission shaft 400 so that the driving shaft is drivingly connected with the transmission shaft 400.

[0133] The elastic member 430 may be, but is not limited to, a spring.

[0134] In this embodiment, the provision of the elastic member 430 is conducive to driving the motor front fork 500 to move so as to adjust the position of the drive shaft, ensure reliable driving connection between the drive shaft and the transmission shaft 400, and further drive the high-speed rotation of the flexible shaft 120.

[0135] In some embodiments, Fig.19As shown, since the end of the transmission shaft 400 is connected to the end of the flexible shaft 120 through the transmission pin 420, the motor front fork 500 is provided with a long hole 501 along its moving direction for avoiding the extended transmission pin 420 during the movement of the motor front fork 500.

[0136] In some embodiments, the flexible shaft 120 has the following physical properties: Bending angle: 0-105 o , rotation speed: 15000rpm-60000rpm, bending radius: 4.5mm-9mm, diameter: 0.5mm-3mm, and length: 5-300mm (for example, 5-50mm, 40-200mm or about 40mm), and the transmission torque is greater than 4.5NM.

[0137] In some embodiments, the flexible shaft 120 has the following physical properties: Bending angle: 0-105 o , rotation speed: 15000rpm-80000rpm, bending radius: 2mm-18mm, diameter: 1mm-7mm, and length: 1mm-40mm, transmission torque greater than 4.5NM.

[0138] In some embodiments, the flexible shaft 120 may have the following physical properties: Bending angle: 50 o -80 o , rotation speed: 15000rpm-80000rpm, bending radius: 6mm-7mm, diameter: 3mm-5mm, and length: 9mm-30mm, transmission torque greater than 4.5NM.

[0139] The present invention is described in detail below through an example.

[0140] like Figure 1-20As shown, a surgical instrument 100 includes an outer tube 110, a flexible shaft 120, a tissue removal head 130 and a handle 300. The outer tube 110 is mounted on the handle 300. The outer tube 110 has a proximal end A2 and a distal end A1 according to the distance from the handle 300. The distal end A1 of the outer tube 110 is provided with a tissue removal head 130. The flexible shaft 120 serves as a driving shaft for driving the tissue removal head 130. The flexible shaft 120 is mounted inside the outer tube 110. The proximal end of the flexible shaft 120 is arranged inside the handle 300 to connect with a driving component. The distal end of the flexible shaft 120 is drivingly connected to the tissue removal head 130 through a connecting shaft 132, and is used to drive the tissue removal to rotate at a high speed under the drive of the driving component. The connecting shaft 132 is movably mounted on the tissue removal head mounting The mounting seat of the tissue removal head 130 is fixedly mounted on the distal end A1 of the outer tube 110 in the mounting hole 212 provided on the seat 131. The distal end A1 of the outer tube 110 is provided with a sheath 133. The sheath 133 is provided on the side of the tissue removal head 130. The distal end A1 of the outer tube 110 is provided with an eleventh bending area 1121. The side of the eleventh bending area 1121 close to the proximal end A2 of the outer tube 110 is provided with a tenth bending area 1120 and a ninth bending area 1119 in sequence. The eleventh bending area 1121 and the ninth bending area 1119 have the same bending direction, and the tenth bending area 1120 and the eleventh bending area have opposite bending directions. The flexible shaft 120 is provided with flexible bending areas in the tenth bending area 1120, the ninth bending area 1119 and the eleventh bending area 1121. The flexible shaft 120 is provided with a bending sheath body 211, and a uniformly distributed first avoidance groove 213 is formed on the outer side of the body 211. When bending, the body 211 can be deformed along with the bending of the outer tube 110 through the first avoidance groove 213, so as to complete the fixation during rotation. The body 211 and the flexible shaft 120 are clearance-matched. The body 211 is made of a material with good wear resistance and self-lubricating properties such as polyvinyl fluoride and polyvinylidene fluoride, and can also be made of elastic materials such as rubber. A second avoidance groove 214 is provided in the mounting hole 212 of the body 211. The second avoidance groove 214 divides the inside of the mounting hole 212 into two sections, which effectively avoids stress concentration and causes the mounting hole to be fixed. The shape of the inner wall 212 is changed to increase the rotational friction with the flexible shaft 120, thereby ensuring the smoothness of the rotation of the flexible shaft 120. The rounded corners at the connection between the second avoidance groove 214 and the body 211 are provided, which is beneficial to the smoothness of the rotation of the flexible shaft 120. At least one side of the outer peripheral surface of the body 211 is formed with an avoidance surface 216, which is extended from the length direction of the body 211. The avoidance surface 216 is used to define a channel between the body 211 and the outer tube 110, which is beneficial to ensuring the circulation of the cooling liquid. Through such a configuration, the flexible shaft 120 rotates in the outer tube 110 to transmit torque to drive the tissue removal head 130 to rotate and complete the removal of the tissue. The fixation of the body 211 can provide more support for the rotation of the flexible shaft 120 to ensure its rotation stability.Among them, the ninth bending area 1119, the tenth bending area 1120, and the eleventh bending area 1121 are multi-bending settings with a combination of multiple angles to better avoid normal tissues, reduce secondary damage to patients, and obtain a better operating field of view;

[0141] The handle 300 is provided with an installation cavity 310, and a first installation groove 312 and a second installation groove 313 are provided in the installation cavity 310. The first installation groove 312 is adjacent to the second installation groove 313 and a step 314 is formed at the connection. A positioning member is provided in the area of ​​the first installation groove 312 near the distal end A1 of the flexible shaft 120 for positioning the installation position of the shock absorber 320. The installation ring 321 is installed in the first installation groove 312. Two support columns 322 are provided at intervals on one side of the installation ring 321, and a gap is formed between the support columns 322. A positioning groove is provided on the other side of the installation ring 321. A plurality of convex ridges are provided at intervals along the circumferential direction on the side wall of the positioning groove. The sliding bearing 323 is provided. The first mounting groove 312 is installed inside the positioning groove, and the outer ring C2 of the sliding bearing 323 is tightly matched with the convex ridge. A sealing member 340 is installed in the first mounting groove 312 close to the sliding bearing 323. The sealing member 340 has an inner wall B1 and an outer wall B2. The inner wall B1 spacer ring is provided with a plurality of first protrusions 341. The flexible shaft 120 passes through the inner wall B1 and the flexible shaft 120 is interference-fitted with the plurality of first protrusions 341. The outer wall B2 spacer ring is provided with a plurality of second protrusions 342. The inner wall of the first mounting groove 312 is provided with a plurality of annular grooves 311 at intervals. The annular grooves 311 and the second protrusions 342 are arranged correspondingly. When the sealing member 340 is installed in the second mounting groove 313, the annular grooves 311 and the second protrusions 342 are arranged correspondingly. The groove 311 cooperates with the second protrusion 342; a support ring 315 is also provided in the first installation groove 312, and the support ring 315 is located between the seal 340 and the positioning bearing 350, and the positioning sleeve of the positioning bearing 350 is located in the second installation groove 313 and the positioning bearing 350 and the step 314 are mutually limited, and a positioning spring 351 is provided at one end of the positioning bearing 350 away from the seal 340, and the positioning spring 351 is fixedly installed on the outside of the transmission shaft 400, and the positioning spring 351 and the positioning bearing 350 are mutually limited; a motor front fork 500 is installed in the second installation groove 313, and a spring is sleeved on the transmission shaft 400, and one end of the spring in the length direction is connected to the positioning shaft The flexible shaft 120 passes through the mounting ring 321, the sliding bearing 323, the seal 340, the positioning bearing 350 and the transmission shaft 400 in sequence. A transmission pin mounting hole 410 is provided at the end of the transmission shaft 400. A through hole matching the transmission pin mounting hole 410 is provided at the end of the flexible shaft 120. A transmission pin 420 is installed in the through hole and the transmission pin mounting hole 410. A long hole is provided on the motor fork 500. The elastic force of the spring drives the motor fork 500 to move along the axial direction of the transmission shaft 400, so that the drive shaft is connected to the transmission shaft 400, thereby reliably driving the flexible column to rotate at high speed.

[0142] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other to form a technical solution.

Claims

1. A support structure for a flexible shaft, characterized in that: The support structure of the flexible shaft is suitable for being installed in a surgical instrument, wherein the surgical instrument has a bending area, and the flexible shaft includes a flexible portion installed in the bending area, and the support structure of the flexible shaft includes: A support member is sleeved on the outer periphery of the flexible portion, and the support member can be bent along with the flexible portion.

2. The support structure according to claim 1, characterized in that: The support member includes a main body, which is provided with a mounting hole along the length direction, and the flexible part is installed in the mounting hole. A plurality of first avoidance grooves are provided on the outer peripheral surface of the main body, and the plurality of first avoidance grooves are arranged at intervals along the length direction of the main body, and each of the first avoidance grooves is provided around the circumference of the main body.

3. The support structure according to claim 2, characterized in that: A second avoidance groove is provided inside the main body. The second avoidance groove is located on the inner wall of the mounting hole. The second avoidance groove is recessed in a direction away from the center of the mounting hole and is arranged around the circumference of the mounting hole.

4. The support structure according to claim 3, characterized in that: A transition area is provided between the groove wall of the second avoidance groove and the body, and the transition area is in an arc structure; The groove wall of the second avoidance groove is an arc surface, and the arc surface protrudes toward the center line of the mounting hole. The groove width of the second avoidance groove gradually increases from the groove bottom of the second avoidance groove to the groove mouth of the second avoidance groove, and the groove wall of the second avoidance groove is configured as the transition area.

5. The support structure according to claim 2, characterized in that: The body is bent with a radius of curvature that is the same as the radius of curvature that is bent with the flexible portion.

6. The support structure according to claim 2, characterized in that: An avoidance surface is formed on at least one side of the outer peripheral surface of the main body. The avoidance surface is extended from the length direction of the main body and is used to define a channel between the main body and the installation inner tube.

7. The support structure according to claim 1, characterized in that: The support member includes a spiral tube, and the spiral tube is sleeved on the outside of the flexible portion.

8. The support structure according to claim 7, characterized in that: The spiral direction of the spiral tube is opposite to the rotation direction of the flexible portion.

9. The support structure according to claim 1, characterized in that: The support member comprises a heat shrinkable sheath, which is sleeved on the outer periphery of the flexible portion and fixed to the outer peripheral surface of the flexible portion after being heated and shrunk.

10. The support structure according to any one of claims 1 to 9, characterized in that: The flexible shaft further includes a rigid part, and the supporting structure further includes a wear-resistant sleeve arranged on the outer periphery of the rigid part, wherein the wear-resistant sleeve is made of polyvinyl fluoride or polyvinylidene fluoride.

11. The support structure according to claim 10, characterized in that The support structure further comprises an installation inner tube, the flexible shaft is installed in the installation inner tube and a cavity is formed between the flexible shaft and the installation inner tube.

12. The support structure according to claim 11, characterized in that A receiving groove is provided inside the installation inner tube, and the receiving groove is recessed from the inner wall of the installation inner tube toward a direction away from the center of the installation inner tube. The wear-resistant sleeve is installed inside the receiving groove, and a positioning protrusion is formed on the side wall of the receiving groove toward the inside of the receiving groove. The positioning protrusion is in conflict with the side wall of the wear-resistant sleeve, and a gap is formed between the receiving groove and the wear-resistant sleeve.

13. A surgical instrument, characterized in that: A support structure comprising the flexible shaft according to any one of claims 10-12.

14. The surgical instrument according to claim 13, characterized in that It also includes a handle, an outer tube is installed on the handle, a tissue removal head is installed at one end of the outer tube, a bending area and a straight area are provided on the outer tube, the flexible shaft is installed inside the outer tube, the flexible part of the flexible shaft is correspondingly installed in the bending area, the rigid part of the flexible shaft is correspondingly installed in the straight area, and the flexible shaft is drivingly connected to the tissue removal head.

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