Transmission connection structure and medical cutter

Abstract

The utility model discloses a transmission connection structure and a medical cutter, the transmission connection structure is applied to the medical cutter, the medical cutter comprises an inner cutter bar assembly, the transmission connection structure comprises a supporting handle, the inner cutter bar assembly is rotatably arranged on the supporting handle in a penetrating mode in the circumferential direction, and the inner cutter bar assembly penetrates out of one side of the supporting handle; the transmission assembly is arranged on the other side of the supporting handle, and the transmission assembly can rotate in the circumferential direction relative to the supporting handle; one end of the connecting piece is fixedly connected to the transmission assembly and can synchronously rotate along with the transmission assembly, the other end of the connecting piece extends into the supporting handle to be in transmission connection with the inner cutter bar assembly, and the inner cutter bar assembly can synchronously rotate along with the transmission assembly through the connecting piece. According to the technical scheme, radial run-out of the connecting piece in the rotating process is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a transmission connection structure and a medical knife. Background Art

[0002] In orthopedic surgery, it is often necessary to grind or drill bone tissue, so many medical devices use a power handle to drive the tool head to rotate to facilitate surgical operations.

[0003] This type of medical knife generally includes a knife head, a knife rod and a transmission assembly. The front end of the knife rod is connected to the knife head, and the rear end of the knife rod is connected to the transmission assembly. The transmission assembly is provided with a socket, which is connected to the power handle through the socket of the transmission assembly to improve the convenience of disassembly and assembly of the knife. When the instrument is in use, the power provided by the power handle drives the transmission assembly to rotate, and the transmission assembly transmits the power to the knife rod to drive the knife rod to rotate, and the knife rod then drives the knife head to rotate. There is an existing medical knife, in which a connecting piece is also provided between the knife rod and the transmission assembly, and the knife rod and the transmission assembly are connected by the connecting piece.

[0004] However, when using this type of medical knife, the connecting part is prone to radial runout. Utility Model Content

[0005] The main purpose of the utility model is to provide a transmission connection structure, aiming to reduce the radial runout of the connection member during the rotation process.

[0006] To achieve the above-mentioned purpose, the transmission connection structure proposed in the utility model is applied to a medical knife, wherein the medical knife includes an inner knife rod assembly, and the transmission connection structure includes:

[0007] A support handle, wherein the inner blade assembly is rotatably disposed on the support handle in the circumferential direction and passes through one side of the support handle;

[0008] A transmission assembly is disposed on the other side of the support handle, and the transmission assembly is rotatable relative to the support handle; and

[0009] A connecting piece, one end of which is fixedly connected to the transmission assembly and can rotate synchronously with the transmission assembly, and the other end extends into the support handle and is transmission-connected to the inner tool rod assembly, so that the inner tool rod assembly can rotate synchronously with the transmission assembly through the connecting piece.

[0010] Optionally, one end of the connecting member connected to the transmission assembly extends into the transmission assembly and makes the connecting member coaxial with the transmission assembly; or,

[0011] One end of the transmission component connected to the connecting member extends into the connecting member and makes the connecting member coaxial with the transmission component.

[0012] Optionally, the connecting member includes:

[0013] A connecting portion, used for fixedly connecting to the transmission assembly;

[0014] The sleeve portion axially penetrates the connecting portion, and the two ends of the sleeve portion extend from the two axial ends of the connecting portion respectively; wherein,

[0015] The sleeve portion is provided with a mounting hole, one end of the sleeve portion extends into the support handle, the inner knife rod assembly is sleeved in the sleeve portion through the mounting hole, and the other end of the sleeve portion extends into the transmission assembly and is fixedly connected to the transmission assembly.

[0016] Optionally, a welding groove is provided at one end of the sleeve portion connected to the transmission assembly, and the welding groove is radially connected to the mounting hole.

[0017] Optionally, at least two welding grooves are symmetrically arranged radially of the sleeve portion, and one end of the welding groove passes through the end surface of the sleeve portion close to the transmission assembly, and the other end of the welding groove extends axially toward the end of the sleeve portion away from the transmission assembly.

[0018] Optionally, the connecting part includes a connecting body and a positioning part arranged on the connecting body, the positioning part is a positioning protrusion or a positioning groove, and one end of the transmission assembly connected to the connecting piece is provided with a positioning groove or a positioning protrusion matching the positioning part, and the transmission assembly and the connecting piece are connected by the positioning protrusion and the positioning groove.

[0019] Optionally, the connecting body and the positioning portion are integrally provided; and / or,

[0020] The connecting body is a circular structure, the center of the positioning portion coincides with the center of the connecting body, and the positioning portion passes through the radial direction of the connecting body.

[0021] Optionally, a shaft sleeve is further included, and the shaft sleeve is sleeved on one end of the connecting member close to the supporting handle.

[0022] Optionally, the sleeve comprises:

[0023] A shaft sleeve portion, sleeved on one end of the connecting member close to the support handle; and

[0024] A rib portion, one end of which is arranged on the outer wall of the shaft sleeve portion, and the other end of which extends in a direction away from the shaft sleeve portion to between the support handle and the connecting member.

[0025] The utility model also proposes a medical knife, comprising the above-mentioned transmission connection structure and an inner knife rod assembly, wherein one end of the transmission connection structure is connected to a power handle, and the other end is transmission-connected to the inner knife rod assembly, and the power transmitted by the transmission connection structure drives the inner knife rod assembly to rotate.

[0026] The transmission connection structure in a technical solution of an embodiment of the utility model is applied to a medical knife. The transmission connection structure includes a support handle, a transmission assembly and a connection member. The inner knife bar assembly of the medical knife can be rotatably inserted into the support handle. The connection member connects the inner knife bar assembly and the transmission assembly. The transmission assembly is used to connect the power handle. The power handle drives the transmission assembly to rotate. The transmission assembly then drives the inner knife bar assembly to rotate through the connection member, thereby realizing the power transmission function of the transmission connection structure. One end of the connection member is fixedly connected to the transmission assembly and can rotate synchronously with the transmission assembly. The other end of the connection member extends into the support handle and is transmission-connected with the inner knife bar assembly, so that the support handle supports the connection member, reduces the problem of radial runout of the connection member during rotation, and reduces the degree of radial runout of the connection member, thereby reducing the radial runout of the inner knife bar assembly driven by the connection member during rotation, thereby improving the rotation accuracy and rotation stability of the inner knife bar assembly, thereby improving the accuracy and safety of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0028] Figure 1 It is a cross-sectional view of a part of the structure of an embodiment of the medical knife of the utility model;

[0029] Figure 2 It is a cross-sectional view of a part of the structure of the transmission connection structure of the utility model;

[0030] Figure 3 It is a structural schematic diagram of the connecting member of the transmission connecting structure of the utility model;

[0031] Figure 4 It is a structural schematic diagram of the inner tool handle of the transmission assembly of the transmission connection structure of the utility model.

[0032] Description of Figure Numbers:

[0033]

[0034]

[0035] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0040] The utility model provides a transmission connection structure.

[0041] Reference Figures 1 to 3 , Figure 1This is a cross-sectional view of a part of the structure of an embodiment of the medical knife of the utility model. Figure 2 It is a cross-sectional view of a part of the transmission connection structure of the utility model. Figure 3 It is a structural schematic diagram of the connecting member of the transmission connection structure of the utility model.

[0042] In the embodiment of the utility model, the transmission connection structure is applied to a medical knife, the medical knife includes an inner knife rod assembly 200, and the transmission connection structure includes:

[0043] The support handle 110, the inner blade assembly 200 is rotatably disposed on the support handle 110 and passes through one side of the support handle 110;

[0044] The transmission assembly 120 is disposed on the other side of the support handle 110 and is used to connect power. The power may be a power handle or other components that can provide a power source. Here, the power handle is used as an example for explanation. The power provided by the power handle enables the transmission assembly 120 to rotate relative to the support handle 110; and

[0045] The connecting member 130 has one end fixedly connected to the transmission assembly 120 and can rotate synchronously with the transmission assembly 120, and the other end extends into the support handle 110 and is transmission-connected to the inner tool rod assembly 200. The inner tool rod assembly 200 can rotate synchronously with the transmission assembly 120 through the connecting member 130.

[0046] A transmission connection structure in a technical solution of an embodiment of the utility model is applied to a medical knife. The transmission connection member 130 structure includes a support handle 110, a transmission assembly 120 and a connection member 130. The inner knife rod assembly 200 of the medical knife is rotatably inserted into the support handle 110. The connection member 130 connects the inner knife rod assembly 200 and the transmission assembly 120. The transmission assembly 120 is used to connect a power handle. The power handle drives the transmission assembly 120 to rotate. The transmission assembly 120 then drives the inner knife rod assembly 200 to rotate through the connection member 130, thereby realizing the power transmission function of the transmission connection structure. One end of the connecting member 130 is fixedly connected to the transmission assembly 120 and can rotate synchronously with the transmission assembly 120. The other end of the connecting member 130 extends into the support handle 110 and is transmission-connected to the inner knife rod assembly 200, so that the support handle 110 supports the connecting member 130, reduces the problem of radial runout of the connecting member 130 during rotation, and reduces the degree of radial runout of the connecting member 130, thereby reducing the radial runout of the inner knife rod assembly 200 driven by the connecting member 130 during rotation, thereby improving the rotation accuracy and rotation stability of the inner knife rod assembly 200, thereby improving the accuracy and safety of the operation.

[0047] Optionally, one end of the connecting member 130 connected to the transmission assembly 120 extends into the transmission assembly 120 and makes the connecting member 130 and the transmission assembly 120 coaxial; or,

[0048] One end of the transmission assembly 120 close to the connecting member 130 extends into the connecting member 130 so that the connecting member 130 and the transmission assembly 120 are coaxial.

[0049] Reference Figure 2 In this embodiment, one end of the connecting member 130 extends into the support handle 110, and the other end of the connecting member 130 extends into the transmission assembly 120. On the one hand, the connection strength between the connecting member 130 and the transmission assembly 120 is improved, and the possibility of separation of the connecting member 130 and the transmission assembly 120 during rotation is reduced, thereby ensuring the reliability of the medical knife during use; on the other hand, it is easier to make the axis of the connecting member 130 coincide with the axis of the transmission assembly 120 during assembly, which not only reduces the assembly difficulty of the transmission connection structure, improves the assembly efficiency, but also further reduces the radial runout of the connecting member 130.

[0050] In this embodiment, one end of the connecting member 130 extends into the support handle 110, and the end of the transmission assembly 120 close to the connecting member 130 extends into the other end of the connecting member 130. On the one hand, the connection strength between the connecting member 130 and the transmission assembly 120 is improved, and the possibility of separation of the connecting member 130 and the transmission assembly 120 during rotation is reduced, thereby ensuring the reliability of the medical knife during use; on the other hand, it is easier to make the axis of the connecting member 130 and the axis of the transmission assembly 120 coincide with each other during assembly, which not only reduces the assembly difficulty of the transmission connection structure, improves the assembly efficiency, but also further reduces the radial runout of the connecting member 130.

[0051] Optionally, the connecting member 130 includes:

[0052] The connecting portion 131 is used for fixedly connecting with the transmission assembly 120;

[0053] The sleeve portion 132 axially penetrates the connecting portion 131 , and two ends of the sleeve portion 132 extend from two axial ends of the connecting portion 131 ;

[0054] The sleeve portion 132 is provided with a mounting hole 1321, one end of the sleeve portion 132 extends into the support handle 110, and the inner knife rod assembly 200 is sleeved in the sleeve portion 132 through the mounting hole 1321, and the other end of the sleeve portion 132 extends into the transmission assembly 120 and is fixedly connected to the transmission assembly 120.

[0055] Reference Figure 3In this embodiment, the connecting member 130 includes a sleeve portion 132 and a connecting portion 131. The sleeve portion 132 passes through the connecting portion 131. One end of the sleeve portion 132 is passed through the support handle 110 and connected to the inner knife rod assembly 200. The other end of the sleeve portion 132 is passed through the transmission assembly 120 and connected to the transmission assembly 120, so that the transmission assembly 120 drives the sleeve portion 132 to rotate through the connecting portion 131, and then the sleeve portion 132 drives the inner knife rod assembly 200 to rotate. The structure is simple and easy to implement. The sleeve portion 132 is provided with a mounting hole 1321, and the sleeve portion 132 is sleeved on the outer periphery of the inner knife rod assembly 200 through the mounting hole 1321, so that the inner knife rod assembly 200 and the sleeve portion 132 are more closely connected, thereby ensuring the reliability of the medical knife during use; on the other hand, the sleeve portion 132 transmits force more evenly when driving the inner knife rod assembly 200 to rotate, and at the same time, the sleeve portion 132 supports the inner knife rod assembly 200, thereby further improving the rotation accuracy of the inner knife rod assembly 200; on another hand, when the connecting member 130 is assembled with the inner knife rod assembly 200, the axis of the sleeve portion 132 is more easily coincident with the axis of the inner knife rod assembly 200, thereby reducing the difficulty of assembling the medical knife.

[0056] Optionally, a welding groove 1322 is provided at one end of the sleeve portion 132 connected to the transmission assembly 120 , and the welding groove 1322 is connected to the mounting hole 1321 in the radial direction.

[0057] Reference Figure 3 In this embodiment, the sleeve portion 132 is provided with a welding groove 1322 connected to the mounting hole 1321. The outer wall of the inner knife rod assembly 200 is connected to the inner wall of the welding groove 1322 by welding, which increases the length of the weld and further improves the connection strength between the inner knife rod assembly 200 and the connecting piece 130, thereby ensuring the reliability of the medical knife during use.

[0058] Optionally, at least two welding grooves 1322 are radially symmetrically arranged on the sleeve portion 132, and one end of the welding groove 1322 passes through the end surface of the sleeve portion 132 close to the transmission assembly 120, and the other end of the welding groove 1322 extends axially toward the end of the sleeve portion 132 away from the transmission assembly 120.

[0059] Reference Figure 3In this embodiment, the welding groove 1322 extends along the axial direction of the sleeve portion 132. The welding groove 1322 is easy to process, which reduces the manufacturing difficulty of the connecting member 130. The welding groove 1322 extends along the axial direction of the sleeve portion 132, that is, extends along the axis of the inner tool bar assembly 200, so that the weld extends along the axial direction of the inner tool bar assembly 200, which reduces the welding difficulty and improves the welding quality. Specifically in this embodiment, two welding grooves 1322 are symmetrically arranged on the sleeve portion 132 to avoid the situation where the center of gravity of the connecting member 130 and the inner tool bar assembly 200 deviates from the rotation axis due to welding, thereby ensuring the rotation accuracy of the inner tool bar assembly 200. The welding groove 1322 is arranged at one end of the sleeve portion 132 away from the support handle 110, that is, at one end of the sleeve portion 132 passing through the transmission assembly 120, so that the force point for the transmission assembly 120 to drive the connecting member 130 to rotate is close to the force point for the connecting member 130 to drive the inner knife rod assembly 200 to rotate, thereby reducing the torsional deformation of the connecting member 130 and extending the service life of the connecting member 130.

[0060] Optionally, the connecting portion 131 includes a connecting body 1311 and a positioning portion arranged on the connecting body 1311, the positioning portion is a positioning protrusion 1312 or a positioning groove 1211, and one end of the transmission component 120 connected to the connecting member 130 is provided with a positioning groove 1211 or a positioning protrusion 1312 matching the positioning portion, and the transmission component 120 and the connecting member 130 are connected by the positioning protrusion 1312 and the positioning groove 1211.

[0061] Combination Figures 2 to 4 In this embodiment, the connecting portion 131 includes a connecting body 1311 and a positioning portion. The positioning portion can be a positioning protrusion 1312 arranged on the connecting body 1311, and a positioning groove 1211 is arranged on the transmission assembly 120 corresponding to the positioning protrusion 1312. The positioning portion can also be a positioning groove 1211 arranged on the connecting body 1311, and a positioning protrusion 1312 is correspondingly arranged on the transmission assembly 120. The positioning protrusion 1312 is inserted into the positioning groove 1211. When the transmission assembly 120 rotates, the positioning protrusion 1312 pushes the inner wall of the positioning groove 1211 to drive the connecting body 1311 to rotate, thereby causing the connecting member 130 to rotate. The structure is simple and easy to implement, and the connecting member 130 and the transmission assembly 120 are detachable, which is convenient for the maintenance and replacement of the transmission assembly 120.

[0062] Optionally, the connecting body 1311 and the positioning portion are integrally provided; and / or,

[0063] The connecting body 1311 is a circular structure, the center of the positioning portion coincides with the center of the connecting body 1311 , and the positioning portion passes through the radial direction of the connecting body 1311 .

[0064] Reference Figure 3In this embodiment, the connecting body 1311 and the positioning portion are integrally arranged to improve the strength of the connecting portion 131, ensure the reliability of the connection between the connecting member 130 and the transmission assembly 120, and reduce the possibility of damage to the transmission connection structure.

[0065] Reference Figure 3 In this embodiment, the connecting body 1311 is a circular structure, the positioning portion passes through the connecting body 1311 along the radial direction of the connecting body 1311, and the center of the positioning portion coincides with the center of the connecting body 1311, so that the center of gravity of the entire connecting part 131 is located at the center of the circle of the connecting body 1311 and on the axis of the sleeve part 132, ensuring that the center of gravity of the entire connecting member 130 does not deviate from the rotation axis, thereby ensuring the rotation accuracy and rotation stability of the connecting member 130.

[0066] Optionally, a shaft sleeve 140 is further included, and the shaft sleeve 140 is sleeved on one end of the connecting member 130 close to the supporting handle 110 .

[0067] Reference Figure 1 In this embodiment, the medical knife further includes a sleeve 140, which is made of a self-lubricating copper alloy or a polymer wear-resistant material. The sleeve 140 is disposed between the sleeve portion 132 and the support handle 110, separating the sleeve portion 132 and the support handle 110, reducing the friction resistance during the rotation of the sleeve portion 132, thereby improving the rotation smoothness of the inner knife rod assembly 200, reducing energy loss, and improving the transmission efficiency of the medical knife. The sleeve 140 can be fixedly connected to the connecting member 130 by welding or interference fit, so that the sleeve 140 rotates with the connecting member 130, avoiding friction between the sleeve 140 and the connecting member 130, and extending the service life of the connecting member 130; the sleeve 140 can also be separated from the connecting member 130, and the sleeve 140 can be rotatably sleeved on the connecting member 130, reducing the difficulty of assembly and improving the assembly efficiency.

[0068] Optionally, the sleeve 140 includes:

[0069] The shaft sleeve portion 141 is sleeved on one end of the connecting member 130 close to the supporting handle 110; and

[0070] The rib portion 142 has one end disposed on the outer wall of the shaft sleeve portion 141 and the other end extending in a direction away from the shaft sleeve portion 141 to between the support handle 110 and the connecting member 130 .

[0071] Combination Figure 1 to Figure 2In this embodiment, the sleeve 140 includes a sleeve portion 141 and a rib portion 142. The sleeve portion 141 is sleeved on the outside of the sleeve portion 132. One end of the rib portion 142 is arranged on the outer peripheral wall of the sleeve portion 141, and the other end of the rib portion 142 extends in a direction away from the sleeve portion 141. The rib portion 142 is arranged between the support handle 110 and the connecting portion 131, which reduces the friction resistance during the rotation of the connecting portion 131, further improves the rotation smoothness of the connecting member 130, thereby improving the rotation smoothness of the inner knife rod assembly 200.

[0072] Reference Figure 2 In this embodiment, the transmission assembly 120 includes an inner tool handle 121 and a stop sleeve 122. The inner tool rod assembly 200 extends into the inner tool handle 121. The stop sleeve 122 is arranged between the inner tool rod assembly 200 and the inner tool handle 121. The connecting portion 131 of the connecting piece 130 is fixedly connected to the inner tool handle 121. The sleeve portion 132 extends into the inner tool handle 121. An interface is provided at one end of the inner tool handle 121 away from the connecting piece 130, and the inner tool handle 121 is plugged into the power handle through the interface.

[0073] The utility model also proposes a medical knife, including the above-mentioned transmission connection structure and an inner knife rod assembly 200, one end of the transmission connection structure is connected to a power handle, and the other end is transmission-connected to the inner knife rod assembly 200, and the power transmitted by the transmission connection structure drives the inner knife rod assembly 200 to rotate.

[0074] The specific structure of the transmission connection structure refers to the above embodiments. Since the medical knife adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0075] The above description is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A transmission connection structure, applied to a medical knife, the medical knife comprising an inner knife rod assembly, characterized in that: The transmission connection structure comprises: A support handle, wherein the inner blade assembly is rotatably disposed on the support handle in the circumferential direction and passes through one side of the support handle; A transmission assembly is disposed on the other side of the support handle, and the transmission assembly is rotatable relative to the support handle; and A connecting piece, one end of which is fixedly connected to the transmission assembly and can rotate synchronously with the transmission assembly, and the other end extends into the support handle and is transmission-connected to the inner tool rod assembly, so that the inner tool rod assembly can rotate synchronously with the transmission assembly through the connecting piece.

2. The transmission connection structure according to claim 1, characterized in that: One end of the connecting member connected to the transmission assembly extends into the transmission assembly and makes the connecting member coaxial with the transmission assembly; or, One end of the transmission component connected to the connecting member extends into the connecting member and makes the connecting member coaxial with the transmission component.

3. The transmission connection structure according to claim 1, characterized in that: The connecting piece comprises: A connecting portion, used for fixedly connecting to the transmission assembly; The sleeve portion axially penetrates the connecting portion, and the two ends of the sleeve portion extend from the two axial ends of the connecting portion respectively; wherein, The sleeve portion is provided with a mounting hole, one end of the sleeve portion extends into the support handle, the inner knife rod assembly is sleeved in the sleeve portion through the mounting hole, and the other end of the sleeve portion extends into the transmission assembly and is fixedly connected to the transmission assembly.

4. The transmission connection structure according to claim 3, characterized in that: A welding groove is provided at one end of the sleeve portion connected to the transmission assembly, and the welding groove is communicated with the mounting hole in a radial direction.

5. The transmission connection structure according to claim 4, characterized in that: At least two welding grooves are symmetrically arranged in the radial direction of the sleeve part, and one end of the welding groove passes through the end surface of the sleeve part close to the transmission component, and the other end of the welding groove extends axially toward the end of the sleeve part away from the transmission component.

6. The transmission connection structure according to claim 3, characterized in that: The connecting part includes a connecting body and a positioning part arranged on the connecting body, the positioning part is a positioning protrusion or a positioning groove, and one end of the transmission component connected to the connecting piece is provided with a positioning groove or a positioning protrusion matching the positioning part, and the transmission component and the connecting piece are connected by the positioning protrusion and the positioning groove.

7. The transmission connection structure according to claim 6, characterized in that: The connecting body and the positioning portion are integrally arranged; and / or, The connecting body is a circular structure, the center of the positioning portion coincides with the center of the connecting body, and the positioning portion passes through the radial direction of the connecting body.

8. The transmission connection structure according to any one of claims 1 to 7, characterized in that: It also includes a shaft sleeve, which is sleeved on one end of the connecting member close to the supporting handle.

9. The transmission connection structure according to claim 8, characterized in that: The sleeve comprises: A shaft sleeve portion, sleeved on one end of the connecting member close to the support handle; and A rib portion, one end of which is arranged on the outer wall of the shaft sleeve portion, and the other end of which extends in a direction away from the shaft sleeve portion to between the support handle and the connecting member.

10. A medical knife, characterized in that: It comprises the transmission connection structure described in any one of claims 1 to 9, and an inner tool rod assembly, wherein one end of the transmission connection structure is connected to a power handle, and the other end is transmission-connected to the inner tool rod assembly, and the power transmitted by the transmission connection structure drives the inner tool rod assembly to rotate.

Images