Medical knife

Abstract

The utility model discloses a medical knife which comprises a knife tube assembly, a knife handle assembly, a knife handle assembly, a knife handle assembly, a knife handle assembly and a knife handle assembly, and a limiting groove is annularly formed in the inner wall of the knife tube assembly; and the rotating assembly is rotatably arranged on the knife tube assembly in a penetrating mode, a limiting protrusion corresponding to the limiting groove is arranged on the outer wall of the rotating assembly in a protruding mode, and the limiting protrusion is inserted into the limiting groove so that axial movement of the rotating assembly relative to the knife tube assembly can be limited through the side wall of the limiting groove. According to the technical scheme, the problem that the rotating assembly in the knife tube is prone to axially moving relative to the knife tube is solved.

Description

Technical Field

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

[0002] A medical knife includes a knife head, a knife rod and a knife tube. The knife rod is rotatably inserted into the knife tube, and the front end of the knife rod is connected to the knife head for driving, and the rear end of the knife rod is connected to a power handle. When the instrument is in use, the power provided by the power handle drives the knife rod to rotate, and the knife rod drives the knife head to rotate.

[0003] When users use this type of medical knife for surgery, they will apply a certain amount of downward pressure. The reaction force of the surgical site on the knife head may cause the knife head or the knife rod to move axially relative to the knife tube, thereby causing damage to the knife. Utility Model Content

[0004] The main purpose of the utility model is to provide a medical knife, aiming to solve the problem that the rotating assembly in the knife tube is prone to axial movement relative to the knife tube.

[0005] In order to achieve the above-mentioned purpose, the medical knife proposed by the utility model comprises:

[0006] A knife tube assembly, wherein the inner wall of the knife tube assembly is provided with a limiting groove; and

[0007] The rotating component is rotatably inserted into the knife tube component. The outer wall of the rotating component is provided with a limiting protrusion corresponding to the limiting groove. The limiting protrusion is inserted into the limiting groove to limit the axial movement of the rotating component relative to the knife tube component through the side wall of the limiting groove.

[0008] Optionally, the limiting protrusion is arranged on the outer wall of the rotating component.

[0009] Optionally, the knife tube assembly comprises:

[0010] The knife tube is provided with a first channel and a second channel which are coaxial and connected, wherein the inner diameter of the second channel is smaller than the inner diameter of the first channel to form a step structure; and

[0011] A stopper is provided with a third channel, the stopper has a first end and a second end opposite to each other, the first end is fixed in the second channel and spaced apart from the step structure, the second end extends in a direction away from the step structure, and the rotating assembly is passed through the first channel and the third channel;

[0012] Wherein, the limiting groove is formed between the first end and the step structure.

[0013] Optionally, the medical knife further comprises a first sleeve, wherein the first sleeve is sleeved on the outside of the rotating assembly and is arranged on a side of the limiting protrusion facing the first end.

[0014] Optionally, the first sleeve comprises:

[0015] A first sleeve body, sleeved on the outside of the rotating assembly, abutting against the side wall of the limiting protrusion facing the first end and the first end; and

[0016] A second sleeve, one end of which is integrally connected to the first sleeve, and the other end of which extends between the rotating assembly and the third channel.

[0017] Optionally, the medical knife further comprises a second sleeve, which is sleeved on the outside of the rotating assembly and disposed between the limiting protrusion and the step structure.

[0018] Optionally, the rotating assembly comprises:

[0019] A universal shaft is rotatably disposed on the knife tube assembly, one end of the universal shaft is used for driving the connected cutter head, and the limiting protrusion is convexly disposed on the outer wall of the universal shaft; and

[0020] A tool rod, one end of which is connected to an end of the universal shaft away from the tool head, and the other end of which extends to the outside of the tool tube assembly in a direction away from the universal shaft.

[0021] Optionally, the knife bar adopts a solid structure; and / or,

[0022] The universal shaft is provided with a socket, the socket is provided at one end of the universal shaft away from the cutter head, the cutter rod is inserted into the socket and fixed by welding; and / or,

[0023] The rotating assembly also includes a protective sleeve, which is sleeved on the outer periphery of the knife rod.

[0024] Optionally, the rotating assembly includes a cutter head, one end of which is rotatably inserted into the cutter tube assembly, and the other end of which extends to the outside of the cutter tube assembly, and the limiting protrusion is protruded from the outer wall of the cutter head.

[0025] Optionally, the limiting member includes a plurality of sub-limiting bodies, each of the sub-limiting bodies is arc-shaped, and a plurality of the sub-limiting bodies are assembled to form the limiting member; and / or,

[0026] The limiting member includes a limiting portion and a mounting portion, wherein the limiting portion is fixed in the second channel and spaced apart from the step structure, and the other end of the limiting portion extends to the outside of the second channel. The mounting portion is disposed at one end of the limiting portion away from the step structure, and connects the knife tube and the limiting portion.

[0027] A medical knife in a technical solution of an embodiment of the utility model includes a knife tube assembly and a rotating assembly, the rotating assembly can be rotatably inserted into the knife tube assembly, and the knife tube assembly separates the rotating assembly from the external environment to play a supporting and protective role, which not only prevents the high-speed rotating assembly from causing damage to other tissues during surgery, but also prevents other tissues from interfering with the normal rotation of the rotating assembly. A limiting groove is provided on the inner wall of the knife tube assembly, and the limiting groove is annularly arranged on the inner wall of the knife tube assembly. A limiting protrusion is convexly provided on the outer wall of the rotating assembly, and the limiting protrusion is integrally formed with the rotating assembly. When the rotating assembly is assembled in the knife tube assembly, the limiting protrusion is inserted into the limiting groove. When the rotating assembly rotates, the limiting protrusion rotates in the annular limiting groove. Among them, the two side walls of the limiting groove opposite to each other along the axial direction of the knife tube assembly block the limiting protrusion from moving along the axial direction of the knife tube assembly, so that the rotating assembly cannot move along the axial direction of the knife tube assembly. When the user uses the medical knife, since the rotating assembly cannot move along the axial direction of the knife tube assembly, the force applied by the user can be accurately transmitted to the surgical site through the medical knife, and the reaction force of the surgical site can also be accurately transmitted to the user's hand through the medical knife, thereby improving the usability of the medical knife and further improving the accuracy and safety of the surgery. On the other hand, the limiting protrusion is convexly arranged on the outer wall of the rotating assembly, which strengthens the strength of the rotating assembly, making the rotating assembly less likely to bend or break, thereby reducing the possibility of damage to the medical knife. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 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.

[0029] Figure 1 A cross-sectional view of a part of the structure of an embodiment of the medical knife of the utility model Figure 1 ;

[0030] Figure 2 A cross-sectional view of a part of the structure of an embodiment of the medical knife of the utility model Figure 2 ;

[0031] Figure 3 A cross-sectional view of a rotating assembly of an embodiment of a medical knife of the utility model;

[0032] Figure 4 It is a structural schematic diagram of the universal shaft of the rotating assembly of the medical knife of the utility model;

[0033] Figure 5 It is a cross-sectional view of a part of the structure of another embodiment of the medical knife of the utility model;

[0034] Figure 6 A cross-sectional view of a knife tube assembly of another embodiment of the medical knife of the utility model;

[0035] Figure 7 It is a structural schematic diagram of the cutter head of the rotating assembly of the medical cutter of the utility model;

[0036] Figure 8 It is a structural schematic diagram of a sub-limiting body of a limiting member of a knife tube assembly of another embodiment of the medical knife of the utility model;

[0037] Fig. 9 It is a cross-sectional view of a part of the structure of another embodiment of the medical knife of the utility model.

[0038] Description of Figure Numbers:

[0039] Label name Label name 100 Knife tube assembly 101 Limit groove 110 Knife tube 111 Step structure 120 Limiting parts 121 Sub-limiter 1211 Limiting part 1212 Installation Department 200 Rotating components 201 Limiting protrusion 210 Cardan shaft 211 Jack 220 Tool bar 230 Protective cover 240 Cutting head 300 First bushing 310 The first set 320 The second body 400 Second bushing

[0040] 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

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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 solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy 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 combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0045] The utility model provides a medical knife.

[0046] Reference Figure 1 to Figure 2 , Figure 1 A cross-sectional view of a part of the structure of an embodiment of the medical knife of the utility model Figure 1 , Figure 2 A cross-sectional view of a part of the structure of an embodiment of the medical knife of the utility model Figure 2 .

[0047] In an embodiment of the utility model, the medical knife comprises:

[0048] A knife tube assembly 100, wherein the inner wall of the knife tube assembly 100 is provided with a limiting groove 101; and

[0049] The rotating assembly 200 is rotatably inserted into the knife tube assembly 100. The outer wall of the rotating assembly 200 is provided with a limiting protrusion 201 corresponding to the limiting groove 101. The limiting protrusion 201 is inserted into the limiting groove 101 to limit the axial movement of the rotating assembly 200 relative to the knife tube assembly 100 through the side wall of the limiting groove 101.

[0050] The medical knife in a technical solution of an embodiment of the utility model comprises a knife tube assembly 100 and a rotating assembly 200, the rotating assembly 200 is rotatably arranged in the knife tube assembly 100, and the knife tube assembly 100 separates the rotating assembly 200 from the external environment to play a supporting and protective role, which not only prevents the rotating assembly 200 rotating at a high speed from causing damage to other tissues during surgery, but also prevents other tissues from interfering with the normal rotation of the rotating assembly 200. A limiting groove 101 is arranged on the inner wall of the knife tube assembly 100 in an annular shape on the inner wall of the knife tube assembly 100, and a limiting protrusion 201 is convexly arranged on the outer wall of the rotating assembly 200, and the limiting protrusion 201 is integrally formed with the rotating assembly 200. When the rotating assembly 200 is assembled in the knife tube assembly 100, the limiting protrusion 201 is inserted into the limiting groove 101, and when the rotating assembly 200 rotates, the limiting protrusion 201 rotates in the annular limiting groove 101. The two side walls of the limiting groove 101 opposite to each other along the axial direction of the knife tube assembly 100 block the limiting protrusion 201 from moving along the axial direction of the knife tube assembly 100, so that the rotating assembly 200 cannot move along the axial direction of the knife tube assembly 100. When the user uses the medical knife, since the rotating assembly 200 cannot move along the axial direction of the knife tube assembly 100, the force applied by the user can be accurately transmitted to the surgical site through the medical knife, and the reaction force of the surgical site can also be accurately transmitted to the user's hand through the medical knife, thereby improving the ease of use of the medical knife, and further improving the accuracy and safety of the surgery. On the other hand, the limiting protrusion 201 is convexly arranged on the outer wall of the rotating assembly 200, which strengthens the strength of the rotating assembly 200, making the rotating assembly 200 less likely to bend or break, thereby reducing the possibility of damage to the medical knife.

[0051] The rotating assembly 200 may be a cutter head assembly of a medical knife, or an inner knife rod assembly of a medical knife.

[0052] Optionally, the limiting protrusion 201 is arranged around the outer wall of the rotating assembly 200 .

[0053] Please combine Figure 2 and Figure 4 In this embodiment, the limiting protrusion 201 is annularly arranged on the outer wall of the rotating assembly 200. The limiting protrusion 201 is relatively large in size, which improves the strength of the limiting protrusion 201 itself, reduces the possibility of damage to the limiting protrusion 201, and also improves the overall strength of the rotating assembly 200, reducing the possibility of bending or breaking of the rotating assembly 200. When the rotating assembly 200 is assembled inside the knife tube assembly 100, the annular limiting protrusion 201 is inserted into the annular limiting groove 101, so that the force transmission between the side wall of the limiting groove 101 and the limiting protrusion 201 is more uniform and dispersed, further reducing the possibility of damage to the limiting protrusion 201, thereby ensuring a good axial limiting effect on the rotating assembly 200.

[0054] Optionally, the knife tube assembly 100 includes:

[0055] The knife tube 110 is provided with a first channel and a second channel which are coaxial and connected, and the inner diameter of the second channel is smaller than the inner diameter of the first channel to form a step structure 111; and

[0056] The stopper 120 is provided with a third channel. The stopper 120 has a first end and a second end opposite to each other. The first end is fixed in the second channel and spaced apart from the step structure 111. The second end extends in a direction away from the step structure 111. The rotating assembly 200 passes through the first channel and the third channel.

[0057] A limiting groove 101 is formed between the first end and the step structure 111 .

[0058] Please refer to Figure 2 In this embodiment, the knife tube assembly 100 includes a knife tube 110 and a stopper 120. The knife tube 110 is provided with a first channel and a second channel that are connected and coaxial. Since the inner diameter of the second channel is smaller than the inner diameter of the first channel, a step structure 111 is formed at the connection between the first channel and the second channel. The first end of the stopper 120 is fixed in the second channel and is spaced apart from the step structure 111. The space between the first end of the stopper 120 and the step structure 111 forms a stopper groove 101. The stopper protrusion 201 can be inserted into the space, so that the first end of the stopper 120 and the step structure 111 are located on both sides of the stopper protrusion 201. The first end of the stopper 120 and the step structure 111 respectively block the axial movement of the rotating assembly 200 toward both sides. The structure is simple, the manufacturing difficulty of the medical knife is reduced, and the strength of the rotating assembly 200 will not be damaged. The strength of the knife tube assembly 100 is also less affected, and the service life of the medical knife is extended. During the specific assembly process, one end of the rotating component 200 is first inserted into the knife tube 110 until the limiting protrusion 201 abuts against the step structure 111, and then the limiting member 120 is sleeved on the outside of the rotating component 200 from the other end of the rotating component 200 until the first end of the limiting member 120 is inserted into the second channel of the knife tube 110, and finally the limiting member 120 and the knife tube 110 are fixed. The assembly method is simple and quick, which improves the assembly efficiency of medical knives.

[0059] Optionally, the medical knife further includes a first sleeve 300 , which is sleeved on the outside of the rotating assembly 200 and disposed on a side of the limiting protrusion 201 facing the first end.

[0060] Reference Figure 1In this embodiment, a first sleeve 300 is provided on the side of the limiting protrusion 201 facing the first end. The first sleeve 300 is made of a self-lubricating copper alloy or a polymer wear-resistant material. The first sleeve 300 is provided between the rotating component 200 and the knife tube 110, and is located between the limiting protrusion 201 and the limiting member 120, which not only separates the outer wall of the rotating component 200 and the inner wall of the second channel, but also separates the side wall of the limiting protrusion 201 facing the limiting member 120 and the limiting member 120, thereby reducing the friction resistance of the rotating component 200 during rotation, thereby improving the rotation smoothness of the rotating component 200, reducing energy loss, and improving the transmission efficiency of the medical knife.

[0061] Optionally, the first sleeve 300 includes:

[0062] The first sleeve 310 is sleeved on the outside of the rotating assembly 200 and abuts against the side wall of the limiting protrusion 201 facing the first end and the first end; and

[0063] The second sleeve 320 has one end integrally connected to the first sleeve 310 , and the other end of the second sleeve 320 extends between the rotating assembly 200 and the third channel.

[0064] Combination Figure 1 and Figure 2 In this embodiment, the first sleeve 300 includes a first sleeve body 310 and a second sleeve body 320. The first sleeve body 310 and the second sleeve body 320 are integrally formed. The first sleeve body 310 separates the outer wall of the rotating component 200 and the inner wall of the second channel, and separates the side wall of the limiting protrusion 201 facing the limiting member 120 and the limiting member 120. The second sleeve body 320 separates the outer wall of the rotating component 200 and the inner wall of the third channel, so that the knife tube 110 and the limiting member 120 are separated from the rotating component 200 by the first sleeve 300, further reducing the friction component during the rotation of the rotating component 200, thereby improving the rotation smoothness of the rotating component 200, reducing energy loss, and improving the transmission efficiency of the medical knife.

[0065] Optionally, the medical knife further includes a second sleeve 400 , which is sleeved on the outside of the rotating assembly 200 and disposed between the limiting protrusion 201 and the step structure 111 .

[0066] Reference Figure 1In this embodiment, the medical knife further includes a second sleeve 400, which is made of a self-lubricating copper alloy or a polymer wear-resistant material. The second sleeve 400 is disposed between the rotating component 200 and the knife tube 110, and is located between the limiting protrusion 201 and the step structure 111, which separates the outer wall of the rotating component 200 and the inner wall of the second channel, and separates the side wall of the limiting protrusion 201 facing the step structure 111 and the step structure 111, thereby reducing the friction resistance during the rotation of the rotating component 200, thereby improving the rotation smoothness of the rotating component 200, reducing energy loss, and improving the transmission efficiency of the medical knife.

[0067] Optionally, the rotating assembly 200 includes:

[0068] A universal shaft 210 is rotatably disposed in the knife tube assembly 100, one end of the universal shaft 210 is used for driving and connecting the cutter head 240, and a limiting protrusion 201 is protruded from the outer wall of the universal shaft 210; and

[0069] The tool rod 220 has one end connected to one end of the universal shaft 210 away from the tool head 240 , and the other end of the tool rod 220 extends to the outside of the tool tube assembly 100 in a direction away from the universal shaft 210 .

[0070] Reference Figure 3 In this embodiment, the rotating assembly 200 is an inner knife bar assembly of a medical knife, and the rotating assembly 200 includes a knife bar 220 and a universal shaft 210. By splitting the rotating assembly 200 into the knife bar 220 and the universal shaft 210, the manufacturing difficulty of the rotating assembly 200 is reduced, which is conducive to improving the manufacturing accuracy of the rotating assembly 200. Specifically in this embodiment, the limiting protrusion 201 is set on the outer wall of the universal shaft 210, and the knife tube assembly 100 supports the universal shaft 210 through the limiting protrusion 201 and the first shaft sleeve 300, and supports the knife bar 220 through the second shaft sleeve 400, so as to ensure the stability of the entire rotating assembly 200 inside the knife tube assembly 100.

[0071] Optionally, the knife bar 220 is of solid structure; and / or,

[0072] The universal shaft 210 is provided with a socket 211, which is provided at one end of the universal shaft 210 away from the cutter head 240, and the cutter rod 220 is inserted into the socket 211 and fixed by welding; and / or,

[0073] The rotating assembly 200 further includes a protective sleeve 230 , which is sleeved on the outer circumference of the knife rod 220 .

[0074] Reference Figure 3In this embodiment, the knife rod 220 adopts a solid structure, the strength of the knife rod 220 is improved, and it can withstand a higher rotation speed, thereby improving the performance of the medical knife; and when meeting the same strength requirements, the knife rod 220 with a solid structure can adopt a smaller diameter than the hollow knife rod 220 in the prior art, that is, the knife rod 220 can be thinner, so that the noise during the rotation process is smaller, reducing the interference of noise on the operation, and improving the safety of the operation.

[0075] Combination Figure 3 to Figure 4 In this embodiment, the universal shaft 210 is provided with a socket 211, and the knife bar 220 is inserted into the socket 211 for fixing, thereby improving the connection strength between the knife bar 220 and the universal shaft 210 and reducing the possibility of damage to the connection between the knife bar 220 and the universal shaft 210. Specifically in this embodiment, a welding groove extending along the axial direction of the universal shaft 210 is provided, and the welding groove is connected to the socket 211. The universal shaft 210 and the knife bar 220 are fixed by welding along the welding groove, thereby extending the length of the weld between the universal shaft 210 and the knife bar 220, and further improving the connection strength between the knife bar 220 and the universal shaft 210.

[0076] Reference Figure 3 In this embodiment, a protective sleeve 230 is provided on the outside of the knife rod 220. The protective sleeve 230 is provided on the outside of the knife rod 220 and is generally made of wear-resistant and self-lubricating materials, such as polyvinyl fluoride, polyvinylidene fluoride, etc. The protective sleeve 230 protects the knife rod 220. On the one hand, it avoids direct friction between the knife rod 220 and the knife tube assembly 100, thereby extending the service life of the knife rod 220. On the other hand, even if the knife rod 220 breaks, the broken knife rod 220 is wrapped inside the protective sleeve 230, thereby preventing the broken knife rod 220 from damaging other parts of the medical knife, thereby facilitating the repair and replacement of the medical knife.

[0077] Optionally, the rotating assembly 200 includes a cutter head 240 , one end of which is rotatably inserted into the cutter tube assembly 100 , and the other end of the cutter head 240 extends to the outside of the cutter tube assembly 100 , and a limiting protrusion 201 is protruded from the outer wall of the cutter head 240 .

[0078] Combination Figures 5 to 7 In this embodiment, the rotating assembly 200 is a cutter head assembly of a medical knife, and the rotating assembly 200 includes a cutter head 240, one end of which is rotatably arranged in the cutter tube assembly 100, and the other end of the cutter head 240 extends to the outside of the cutter tube assembly 100, and is used for cutting or grinding the surgical site. The limiting protrusion 201 is arranged on the outer wall of the cutter head 240, and the cutter tube assembly 100 supports the cutter head 240 through the limiting protrusion 201 and the second sleeve 400, so as to ensure the stability of the cutter head 240 inside the cutter tube assembly 100.

[0079] Optionally, the limiting member 120 includes a plurality of sub-limiting bodies 121, each of which is arc-shaped, and the plurality of sub-limiting bodies 121 are assembled to form the limiting member 120; and / or,

[0080] The limiting member 120 includes a limiting portion 1211 and a mounting portion 1212. The limiting portion 1211 is fixed in the second channel and spaced apart from the step structure 111. The other end of the limiting portion 1211 extends to the outside of the second channel. The mounting portion 1212 is disposed at one end of the limiting portion 1211 away from the step structure 111, connecting the knife tube 110 and the limiting portion 1211.

[0081] Combination Figure 5 and Figure 8 In this embodiment, the limiting member 120 includes a plurality of arc-shaped sub-limiting bodies 121. The limiting member 120 is formed by splicing the plurality of arc-shaped sub-limiting bodies 121, which makes assembly more convenient and avoids the problem that the integral limiting member 120 is blocked by the limiting protrusion 201 and is difficult to be set outside the cutter head 240. In the specific assembly process, the tail end of the cutter head 240 is first inserted into the cutter tube 110, so that the limiting protrusion 201 on the cutter head 240 is close to the step structure 111, and then the sub-limiting body 121 is welded to the cutter tube 110, so that the sub-limiting body 121 is fixed on the side of the limiting protrusion 201 away from the step structure 111.

[0082] Combination Figure 6 and Figure 8 In this embodiment, the limiting member 120 includes a limiting portion 1211 and a mounting portion 1212. The limiting portion 1211 is inserted into the interior of the second channel and is spaced apart from the step structure 111. A limiting groove 101 is formed between the limiting portion 1211 and the step structure 111. The mounting portion 1212 is located outside the knife tube 110 and is fixed to the knife tube 110, so that it is convenient to weld and fix with the knife tube 110, so that the limiting member 120 itself is easy to assemble, ensuring that the limiting member 120 is firmly connected to the knife tube 110, thereby ensuring the axial limiting function of the tool head 240.

[0083] In the same medical tool, only the universal shaft 210 may be axially limited, or only the tool head 240 may be axially limited. Specifically in this embodiment, Fig. 9 As shown, both the cutter head 240 and the universal shaft 210 are axially limited, which ensures that both the cutter head 240 and the universal shaft 210 cannot move axially, further improving the usability of the medical knife and ensuring the accuracy and safety of the operation.

[0084] 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 medical knife, characterized in that: include: A knife tube assembly and a rotating assembly rotatably arranged on the knife tube assembly; wherein, One of the inner wall of the knife tube assembly and the outer wall of the rotating assembly is provided with a limiting groove, and the other of the inner wall of the knife tube assembly and the outer wall of the rotating assembly is provided with a limiting protrusion matching the limiting groove, so that the axial movement of the rotating assembly relative to the knife tube assembly is limited by the limiting groove and the limiting lower circumference.

2. The medical knife according to claim 1, characterized in that: The limiting groove is arranged on the inner wall of the knife tube assembly, and the limiting protrusion is arranged on the outer wall of the rotating assembly.

3. The medical knife according to claim 2, characterized in that: The knife tube assembly comprises: A knife tube, provided with a first channel and a second channel which are coaxial and connected, wherein the inner diameter of the second channel is smaller than the inner diameter of the first channel to form a step structure; and A stopper is provided with a third channel, the stopper has a first end and a second end opposite to each other, the first end is fixed in the second channel and spaced apart from the step structure, the second end extends in a direction away from the step structure, and the rotating assembly is passed through the first channel and the third channel; Wherein, the limiting groove is formed between the first end and the step structure.

4. The medical knife according to claim 3, characterized in that: It also includes a first sleeve, which is sleeved on the outside of the rotating assembly and is arranged on the side of the limiting protrusion facing the first end.

5. The medical knife according to claim 4, characterized in that: The first sleeve comprises: A first sleeve body, which is externally mounted on the rotating assembly and abuts against the side wall of the limiting protrusion facing the first end and the first end; and A second sleeve, one end of which is integrally connected to the first sleeve, and the other end of which extends between the rotating assembly and the third channel.

6. The medical knife according to claim 3, characterized in that: It also includes a second sleeve, which is sleeved on the outside of the rotating assembly and arranged between the limiting protrusion and the step structure.

7. The medical knife according to any one of claims 1 to 6, characterized in that: The rotating assembly comprises: A universal shaft is rotatably disposed in the knife tube assembly, the universal shaft has a first end and a second end, the first end of the universal shaft is used for driving the connected cutter head, and the limiting protrusion is convexly disposed on the outer wall of the second end of the universal shaft; and A tool rod, one end of which is connected to the second end of the universal shaft, and the other end of which extends to the outside of the tool tube assembly in a direction away from the universal shaft.

8. The medical knife according to claim 7, characterized in that: The knife bar adopts a solid structure; and / or, The universal shaft is provided with a socket, the socket is provided at the second end of the universal shaft, the knife bar is inserted into the socket and fixed by welding; and / or, The rotating assembly also includes a protective sleeve, which is sleeved on the outer periphery of the knife rod.

9. The medical knife according to any one of claims 3 to 6, characterized in that: The rotating assembly includes a cutter head, one end of which is rotatably inserted into the cutter tube assembly, and the other end of which extends to the outside of the cutter tube assembly. The limiting protrusion is protruded from the outer wall of the cutter head.

10. The medical knife according to claim 9, characterized in that: The limiting member includes a plurality of sub-limiting bodies, each of which is arc-shaped, and a plurality of sub-limiting bodies are assembled to form the limiting member; and / or, The limiting member includes a limiting portion and a mounting portion, wherein the limiting portion is fixed in the second channel and spaced apart from the step structure, and the other end of the limiting portion extends to the outside of the second channel. The mounting portion is disposed at one end of the limiting portion away from the step structure, and connects the knife tube and the limiting portion.

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