Tool bit turning mechanism and medical turning tool

Abstract

The utility model discloses a tool bit direction changing mechanism and medical direction changing cutter, the tool bit direction changing mechanism is applied to the medical direction changing cutter, the medical direction changing cutter comprises a tool bit and an inner cutter bar assembly, the inner cutter bar assembly is hinged to the tool bit to transmit torque to the tool bit to drive the tool bit to rotate and can do pitching motion relative to the axis of the medical direction changing cutter, and the inner cutter bar assembly is hinged to the tool bit to drive the tool bit to rotate. The tool bit direction changing mechanism comprises a fixing piece, an inner tool bar assembly and a rotating piece. The fixing piece is arranged outside the inner tool bar assembly in a sleeving mode. The sliding piece is arranged outside the fixed piece in a sliding and sleeving manner and can axially move relative to the fixed piece; the bending supporting sleeve is arranged outside the tool bit in a sleeving mode, the tool bit extends out of one end of the bending supporting sleeve, the other end of the bending supporting sleeve is provided with a first connecting part and a second connecting part, the first connecting part is rotationally connected with the sliding piece, and the second connecting part is rotationally connected with the fixing piece; the bending supporting sleeve and the tool bit are driven to do pitching motion relative to the inner tool bar assembly through axial movement of the sliding piece. According to the technical scheme, the manufacturing difficulty of the tool bit turning mechanism is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a knife head direction-changing mechanism and a medical direction-changing knife. Background Art

[0002] In orthopedic surgery, it is often necessary to grind or drill bone tissue. However, when the surgical site is deep or the surgical angle is relatively complex, it is hoped that the direction of the blade can be changed to facilitate the surgical operation.

[0003] There is a medical knife with a changeable blade head, which includes an inner blade assembly, a blade head and a blade head change mechanism, wherein the inner blade assembly is connected to the blade head and transmits torque to the blade head through the inner blade assembly. The blade head change mechanism includes a change control tube, an outer blade tube and a support sleeve, wherein the blade head is sleeved inside the support sleeve and extends out from one end of the support sleeve, and the change control tube is arranged between the inner blade assembly and the outer blade tube and is rotatably connected to the support sleeve, and the support sleeve and the blade head inside the support sleeve are driven to pitch by operating the change control tube to move forward and backward, thereby changing the direction of the blade head.

[0004] The direction-changing control tube drives the support sleeve to pitch and roll through linear motion. In order to make the support sleeve have a sufficient rotation radius, the end of the direction-changing control tube close to the support sleeve needs to pass through the outer knife tube and extend from the inside of the outer knife tube to the outside of the outer knife tube. This will inevitably increase the number of parts, resulting in complex connection structures between the parts and greater difficulty in processing and manufacturing the parts. Utility Model Content

[0005] The main purpose of the utility model is to provide a cutter head direction changing mechanism, aiming to simplify the connection structure between parts and components and reduce the manufacturing difficulty of the cutter head direction changing mechanism.

[0006] To achieve the above-mentioned purpose, the tool head changing mechanism proposed in the utility model is applied to a medical changing direction knife, the medical changing direction knife comprises a tool head and an inner tool rod assembly, the inner tool rod assembly is hinged to the tool head to transmit torque to the tool head to drive the tool head to rotate and pitch relative to the axis of the medical changing direction knife, the tool head changing mechanism comprises:

[0007] A fixing member, sleeved on the outside of the inner knife rod assembly;

[0008] a sliding member, movably disposed outside the fixing member and capable of axially moving relative to the fixing member; and

[0009] A bending support sleeve is sleeved on the outside of the cutter head and the cutter head extends from one end of the bending support sleeve, and the other end of the bending support sleeve has a first connecting portion and a second connecting portion opposite to each other, the first connecting portion is rotatably connected to the sliding member, and the second connecting portion is rotatably connected to the fixing member, and the bending support sleeve and the cutter head are driven to pitch relative to the inner cutter bar assembly through the axial movement of the sliding member;

[0010] Wherein, an avoidance gap is provided at one end of the bending support sleeve close to the fixing member and / or one end of the fixing member close to the bending support sleeve.

[0011] Optionally, the curved support sleeve comprises:

[0012] a direction-changing support portion, having a first end away from the fixing member and a second end close to the fixing member, wherein the cutter head is sleeved in the direction-changing support portion and extends out from the first end of the direction-changing support portion; and

[0013] A curved support portion, provided at the second end of the direction-changing support portion, wherein the first connecting portion and the second connecting portion are both provided at the curved support portion;

[0014] Wherein, the curved support portion is sleeved with the fixing piece.

[0015] Optionally, the curved support portion is externally mounted on an end of the fixing member close to the cutter head.

[0016] Optionally, the sliding member comprises:

[0017] A sliding support portion, slidably sleeved on the exterior of the fixing member; and

[0018] The cantilever part has a first end and a second end, wherein the first end of the cantilever part is connected to the sliding support part, and the second end of the cantilever part extends in a direction away from the sliding support part and is rotatably connected to the first connection part.

[0019] Optionally, the thickness of the first end of the cantilever portion is smaller than the thickness of the second end of the cantilever portion; and / or,

[0020] The cantilever portion is provided with a concave curved surface, the concave curved surface is provided on a side of the cantilever portion facing the inner knife bar assembly and is recessed in a direction away from the inner knife bar assembly; and / or,

[0021] The curved support portion is provided with a mounting groove, the mounting groove is provided at one end of the curved support portion away from the direction-changing support portion, and the first connecting portion is a hole provided on a groove wall of the mounting groove.

[0022] Optionally, the fixing member includes:

[0023] A fixed support portion is sleeved on the outside of the inner knife bar assembly, and the sliding support portion is slidably sleeved on the outside of the fixed support portion; and

[0024] The fixed connection portion is arranged on a side of the fixed support portion close to the direction-changing support portion and is sleeved with the curved support portion.

[0025] Optionally, the fixed support portion includes a first pipe segment and a second pipe segment, the second pipe segment connects the first pipe segment and the fixed connection portion, the sliding support portion is slidably sleeved on the outside of the first pipe segment, the outer diameter of the second pipe segment is larger than the outer diameter of the first pipe segment to form a first step structure, and the sliding stroke of the sliding support portion is limited by the first step structure.

[0026] Optionally, one of the outer peripheral wall of the cutter head and the inner wall of the bending support sleeve is provided with a limiting protrusion, and the other of the outer peripheral wall of the cutter head and the inner wall of the bending support sleeve is provided with a limiting groove corresponding to the limiting protrusion, and the limiting protrusion is inserted into the limiting groove to prevent the cutter head from moving axially along the bending support sleeve.

[0027] Optionally, the cutter head changing mechanism further comprises a sheath, wherein the sheath is disposed on the outside of the cutter head and abuts against an inner wall of the curved support sleeve.

[0028] The utility model also provides a medical direction-changing knife, comprising an inner knife bar assembly and a knife head drivingly connected to the inner knife bar assembly, and also comprising the above-mentioned knife head direction-changing mechanism, and:

[0029] A support handle, wherein the inner blade assembly is inserted through the support handle;

[0030] An inner knife tube is sleeved on the outside of the inner knife rod assembly and fixed to the support handle, and the fixing member is fixed to the inner knife tube;

[0031] An outer knife tube is movably sleeved on the outer side of the inner knife tube, and the sliding member is connected to the outer knife tube;

[0032] An adjusting component is connected to the outer knife tube, and drives the outer knife tube to move axially through the adjusting component to drive the sliding member to move axially. The axial movement of the sliding member causes the bending support sleeve and the cutter head to pitch.

[0033] A blade changing mechanism in a technical solution of an embodiment of the utility model is applied to a medical changing direction tool, which includes a blade and an inner blade rod assembly. The inner blade rod assembly drives the blade head to rotate so that the blade head can perform operations such as cutting, grinding, or drilling, and the blade head can rotate relative to the inner blade rod assembly so that the blade head can rotate 360 ​​degrees. The blade changing mechanism can change the blade head to different directions, thereby facilitating surgical operations from different angles. The tool head direction changing mechanism includes a fixed part, a sliding part and a bending support sleeve. The fixed part is sleeved on the outside of the inner tool rod assembly to play a supporting role. The sliding part is arranged on the outside of the fixed part and can move along the axial direction of the fixed part. The bending support sleeve is sleeved on the outside of the tool head. The bending support sleeve has a first connection part and a second connection part, wherein the first connection part is rotatably connected to the sliding part, and the second connection part is rotatably connected to the fixed part. When the sliding part moves along the axial direction of the fixed part, the first connection part rotates around the second connection part under the drive of the sliding part, so that the bending support sleeve rotates, thereby driving the tool head inside the bending support sleeve to rotate, realizing the function of adjusting the direction of the tool head, improving the convenience of surgical operation, and making the surgical angle more flexible. The tool head direction changing mechanism can be applied to a variety of medical tools such as medical milling cutters and medical sharpening knives, and has a wide range of applications. The cutter head direction changing mechanism has a small number of parts, and the sliding part moves outside the fixed part, with a simple structure, thereby reducing the manufacturing difficulty of the cutter head direction changing mechanism and making the cutter head direction changing mechanism easy to assemble; on the other hand, the inner tool rod assembly that controls the rotation of the cutter head and the sliding part that controls the direction changing of the cutter head are separated by a fixed fixed part, thereby avoiding the problem of interference between the rotation of the cutter head and the direction changing of the cutter head; on another hand, compared with the prior art, the sliding part and the fixed part have a simpler structure, lower processing and manufacturing difficulty, and are not prone to failure during long-term use, thereby improving the reliability of the cutter head direction changing mechanism and extending the service life of the cutter head direction changing mechanism. Even if damage occurs, it is easy to repair and replace, thereby reducing the cost of use. An avoidance gap can be set at one end of the bending support sleeve close to the fixed part, and the fixed part extends into the avoidance gap on the bending support sleeve when the bending support sleeve pitches; an avoidance gap can also be set at one end of the fixed part close to the bending support sleeve, and the bending support sleeve extends into the avoidance gap on the fixed part when the bending support sleeve pitches. Providing the avoidance gap can make the structure of the entire cutter head changing mechanism more compact, reduce the volume of the cutter head changing mechanism, and avoid interference between the bending support sleeve and the fixed part during the pitching movement, thereby ensuring that the cutter head changing mechanism can reach a preset changing angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] 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.

[0035] Figure 1 The structure diagram of the first embodiment of the tool head changing mechanism of the utility model is shown in FIG. Figure 1 ;

[0036] Figure 2 The structure diagram of the first embodiment of the tool head changing mechanism of the utility model is shown in FIG. Figure 2 ;

[0037] Figure 3 A cross-sectional view of a part of the structure of the first embodiment of the medical direction-changing tool of the utility model Figure 1 ;

[0038] Figure 4 A cross-sectional view of a part of the structure of the first embodiment of the medical direction-changing tool of the utility model Figure 2 ;

[0039] Figure 5 It is a structural schematic diagram of a bending support sleeve of the first embodiment of the cutter head changing mechanism of the utility model;

[0040] Figure 6 It is a structural schematic diagram of a fixing member of the first embodiment of the cutter head changing mechanism of the utility model;

[0041] Figure 7 It is a cross-sectional view of a sliding member of the first embodiment of the tool head changing mechanism of the utility model;

[0042] Figure 8 It is a structural schematic diagram of a sliding member of the first embodiment of the tool head changing mechanism of the utility model;

[0043] Fig. 9 It is a cross-sectional view of a part of the structure of the second embodiment of the medical direction-changing tool of the utility model;

[0044] Fig.10 It is a cross-sectional view of a part of the structure of the second embodiment of the tool head changing mechanism of the utility model;

[0045] Fig.11 This is a schematic diagram of the structure of the cutter head of the second embodiment of the medical direction-changing cutter of the utility model;

[0046] Fig.12 It is a structural schematic diagram of a sub-limiting body of the first limiter of the second embodiment of the tool head changing mechanism of the utility model;

[0047] Fig.13 It is a structural schematic diagram of a bending support sleeve of the second embodiment of the cutter head changing mechanism of the utility model;

[0048] Fig.14 It is a cross-sectional view of a part of the structure of the first embodiment of the tool head changing mechanism of the utility model;

[0049] Fig.15 This is a schematic diagram of the structure of the cutter head of the first embodiment of the medical direction-changing cutter of the utility model;

[0050] Fig.16 It is a cross-sectional view of the first embodiment of the medical direction-changing tool of the utility model;

[0051] Fig.17 A cross-sectional view of a part of the structure of the first embodiment of the medical direction-changing tool of the utility model Figure 3 .

[0052] Description of Figure Numbers:

[0053]

[0054]

[0055] 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

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] The utility model provides a cutter head direction changing mechanism.

[0061] Reference Figures 1 to 4 as well as Fig.14 , Figure 1 The structure diagram of the first embodiment of the tool head changing mechanism of the utility model is shown in FIG. Figure 1 , Figure 2 The structure diagram of the first embodiment of the tool head changing mechanism of the utility model is shown in FIG. Figure 2 , Figure 3 A cross-sectional view of a part of the structure of the first embodiment of the medical direction-changing tool of the utility model Figure 1 , Figure 4 A cross-sectional view of a part of the structure of the first embodiment of the medical direction-changing tool of the utility model Figure 2 , Fig.14 It is a cross-sectional view of a part of the structure of the first embodiment of the tool head changing mechanism of the utility model.

[0062] In an embodiment of the utility model, the cutter head changing mechanism 100 is applied to a medical changing direction knife, the medical changing direction knife comprises a cutter head 200 and an inner cutter rod assembly 300, the inner cutter rod assembly 300 is hinged to the cutter head 200 to transmit torque to the cutter head 200 to drive the cutter head 200 to rotate and pitch relative to the axis of the medical changing direction knife, the cutter head changing mechanism 100 comprises:

[0063] The fixing member 110 is sleeved on the outside of the inner blade assembly 300;

[0064] a sliding member 120 movably disposed outside the fixing member 110 and axially movable relative to the fixing member 110; and

[0065] A bending support sleeve 130 is sleeved on the outside of the cutter head 200 and the cutter head 200 extends from one end of the bending support sleeve 130. The other end of the bending support sleeve 130 has a first connecting portion 1321 and a second connecting portion 1322 opposite to each other. The first connecting portion 1321 is rotatably connected to the sliding member 120, and the second connecting portion 1322 is rotatably connected to the fixing member 110. The bending support sleeve 130 and the cutter head 200 are driven to pitch relative to the inner cutter bar assembly 300 by the axial movement of the sliding member 120.

[0066] Wherein, an avoidance notch 1324 is provided at one end of the bending support sleeve 130 close to the fixing member 110 and / or at one end of the fixing member 110 close to the bending support sleeve 130 .

[0067] A tool head changing mechanism 100 in a technical solution of an embodiment of the utility model is applied to a medical changing direction tool, which includes a tool head 200 and an inner tool rod assembly 300. The inner tool rod assembly 300 drives the tool head 200 to rotate, so that the tool head 200 performs operations such as cutting, grinding, or drilling, and the tool head 200 can rotate relative to the inner tool rod assembly 300, so that the tool head 200 can rotate 360 ​​degrees, and the tool head changing mechanism 100 can change different directions of the tool head 200, thereby facilitating surgical operations from different angles. The cutter head changing mechanism 100 includes a fixing member 110, a sliding member 120 and a bending support sleeve 130. The fixing member 110 is sleeved on the outside of the inner knife rod assembly 300 to play a supporting role. The sliding member 120 is arranged on the outside of the fixing member 110 and can move along the axial direction of the fixing member 110. The bending support sleeve 130 is sleeved on the outside of the cutter head 200. The bending support sleeve 130 has a first connecting portion 1321 and a second connecting portion 1322, wherein the first connecting portion 1321 is rotatably connected to the sliding member 120, and the second connecting portion 1322 is rotatably connected to the fixing member 110. When the sliding member 120 moves along the axial direction of the fixing member 110, the first connecting portion 1321 rotates around the second connecting portion 1322 driven by the sliding member 120, so that the bending support sleeve 130 rotates, thereby driving the cutter head 200 inside the bending support sleeve 130 to rotate, thereby realizing the function of adjusting the direction of the cutter head 200, improving the convenience of surgical operation, and making the surgical angle more flexible. The tool head changing mechanism 100 can be applied to a variety of medical knives such as medical milling cutters and medical sharpeners, and has a wide range of applications. The tool head changing mechanism 100 has a small number of parts, and the sliding member 120 moves outside the fixing member 110, and the structure is simple, thereby reducing the manufacturing difficulty of the tool head changing mechanism 100, making the tool head changing mechanism 100 easy to assemble; on the other hand, the inner tool rod assembly 300 that controls the rotation of the tool head 200 and the sliding member 120 that controls the change of direction of the tool head 200 are separated by the fixed fixing member 110, avoiding the problem of interference between the rotation of the tool head 200 and the change of direction of the tool head 200; on the other hand, the sliding member 120 and the fixing member 110 are simpler in structure than the prior art, with low difficulty in processing and manufacturing, and are not prone to failure during long-term use, thereby improving the reliability of the tool head changing mechanism 100, extending the service life of the tool head changing mechanism 100, and even if damaged, they are easy to repair and replace, reducing the cost of use.An avoidance notch 1324 can be provided at one end of the bending support sleeve 130 close to the fixing member 110, and when the bending support sleeve 130 pitches, the fixing member 110 extends into the avoidance notch 1324 on the bending support sleeve 130; an avoidance notch 1324 can also be provided at one end of the fixing member 110 close to the bending support sleeve 130, and when the bending support sleeve 130 pitches, the bending support sleeve 130 extends into the avoidance notch 1324 on the fixing member 110. Providing the avoidance notch 1324 can make the structure of the entire tool head changing mechanism 100 more compact, reduce the volume of the tool head changing mechanism 100, and avoid interference between the bending support sleeve 130 and the fixing member 110 during the pitching movement, thereby ensuring that the tool head changing mechanism 100 can reach a preset changing angle.

[0068] Optionally, the curved support sleeve 130 comprises:

[0069] The direction-changing support portion 131 has a first end away from the fixing member 110 and a second end close to the fixing member 110 , and the cutter head 200 is sleeved in the direction-changing support portion 131 and extends out from the first end of the direction-changing support portion 131 ; and

[0070] The curved support portion 132 is disposed at the second end of the direction-changing support portion 131 , and the first connecting portion 1321 and the second connecting portion 1322 are both disposed at the curved support portion 132 ;

[0071] The curved support portion 132 is sleeved with the fixing member 110 .

[0072] Reference Figure 5 In this embodiment, the bending support sleeve 130 includes a changing support portion 131 and a bending support portion 132. The changing support portion 131 is sleeved on the outside of the cutter head 200. The first connecting portion 1321 and the second connecting portion 1322 are arranged on the bending support portion 132. When the sliding member 120 drives the bending support portion 132 to rotate, the changing support portion 131 rotates with the bending support portion 132, thereby driving the cutter head 200 inside the changing support portion 131 to rotate. The curved support portion 132 is sleeved with the fixing member 110, and the curved support portion 132 can be sleeved on the outside of the fixing member 110, or the fixing member 110 can be sleeved on the outside of the curved support portion 132. The sleeved connection allows the curved support sleeve 130 and the fixing member 110 to form an overlapping area in the radial direction of the cutter head 200, thereby making the connection between the fixing member 110 and the curved support sleeve 130 tighter, and improving the lateral load resistance of the cutter head changing mechanism 100, reducing the possibility of separation of the curved support sleeve 130 and the fixing member 110 due to lateral force during surgery, extending the service life of the medical changing knife, and improving the safety of surgery.

[0073] Optionally, the curved support portion 132 is externally mounted on an end of the fixing member 110 close to the cutter head 200 .

[0074] Combination Figure 1 , Figure 2 and Figure 5 In this embodiment, the bending support portion 132 is sleeved on the outside of the fixing member 110, that is, the bending support sleeve 130 is sleeved on the outside of the fixing member 110, and the bending support sleeve 130 and the sliding member 120 are both arranged on the outside of the fixing member 110. The structure is simple and easy to manufacture, which reduces the assembly difficulty of the tool head changing mechanism 100 and improves the production efficiency of the tool head changing mechanism 100.

[0075] Optionally, the sliding member 120 includes:

[0076] A sliding support portion 121 is slidably mounted on the exterior of the fixing member 110; and

[0077] The cantilever portion 122 has a first end and a second end. The first end of the cantilever portion 122 is connected to the sliding support portion 121 , and the second end of the cantilever portion 122 extends in a direction away from the sliding support portion 121 and is rotatably connected to the first connection portion 1321 .

[0078] Reference Figure 1 , Figure 2 , Figure 7 and Figure 8 In this embodiment, the sliding member 120 includes a sliding support portion 121 and a cantilever portion 122. The sliding support portion 121 is sleeved on the outside of the fixed member 110. The first end of the cantilever portion 122 is connected to the sliding support portion 121, and the second end of the cantilever portion 122 is rotatably connected to the first connecting portion 1321. The axial movement of the sliding support portion 121 along the fixed member 110 drives the cantilever portion 122 to move, and the cantilever portion 122 drives the bending support sleeve 130 to rotate. When the bending support sleeve 130 rotates, the first connection part 1321 performs a pitch motion around the second connection part 1322. The motion of the first connection part 1321 can be decomposed into an axial motion along the fixing member 110 and a radial motion along the fixing member 110. The axial movement of the sliding support part 121 along the fixing member 110 drives the cantilever part 122 to move, thereby realizing the axial movement of the first connection part 1321 along the fixing member 110. At the same time, the second end of the cantilever part 122 can be slightly deformed in a direction away from the fixing member 110 to compensate for the radial movement of the first connection part 1321 along the fixing member 110, thereby avoiding the sliding member 120 and the bending support sleeve 130 from getting stuck, and realizing the pitch motion of the bending support sleeve 130 driven by the sliding member 120 that moves in a straight line. The structure is simple and the manufacturing cost is low.

[0079] Optionally, the thickness of the first end of the cantilever portion 122 is smaller than the thickness of the second end of the cantilever portion 122; and / or,

[0080] The cantilever portion 122 is provided with a concave curved surface 1221, which is provided on a side of the cantilever portion 122 facing the inner knife bar assembly 300 and is recessed in a direction away from the inner knife bar assembly 300; and / or,

[0081] The curved support portion 132 is provided with a mounting groove 1323 . The mounting groove 1323 is provided at one end of the curved support portion 132 away from the direction-changing support portion 131 . The first connecting portion 1321 is a hole provided on the groove wall of the mounting groove 1323 .

[0082] Reference Figure 7 In this embodiment, the thickness of the first end of the cantilever portion 122 is less than the thickness of the second end of the cantilever portion 122, that is, the thickness of the end of the cantilever portion 122 connected to the sliding support portion 121 is less than the thickness of the end of the cantilever portion 122 connected to the bending support sleeve 130, thereby improving the elastic deformation capacity of the cantilever portion 122. When the cantilever portion 122 drives the bending support sleeve 130 to pitch, the cantilever portion 122 is more likely to elastically deform to compensate for the radial displacement of the first connecting portion 1321, further reducing the possibility of the sliding member 120 and the bending support sleeve 130 getting stuck, thereby making the tool head changing mechanism 100 smoother when moving, thereby improving the smoothness of the tool head 200 changing direction.

[0083] Reference Figure 8 In this embodiment, when the cantilever portion 122 drives the bending support sleeve 130 to rotate, the cantilever portion 122 will be slightly deformed in the direction away from the inner tool rod assembly 300, and a concave curved surface 1221 is provided on the side of the cantilever portion 122 facing the inner tool rod assembly 300, and the concave curved surface 1221 is recessed in the direction away from the inner tool rod assembly 300. By providing the concave curved surface 1221, the cantilever portion 122 has a certain ability to resist deformation in the direction away from the inner tool rod assembly 300, thereby reducing the possibility of the cantilever portion 122 breaking, extending the service life of the sliding member 120, and further extending the service life of the tool head changing mechanism 100.

[0084] Reference Figure 1 , Figure 5 and Figure 8In this embodiment, the curved support portion 132 is provided with a mounting groove 1323, and the mounting groove 1323 penetrates the side wall of the curved support portion 132, and extends from one end of the curved support portion 132 close to the fixing member 110 toward the direction close to the direction-changing support portion 131. The second end of the cantilever portion 122 extends into the interior of the mounting groove 1323, and the first connecting portion 1321 is a hole provided on two opposite groove walls of the mounting groove 1323. A hole corresponding to the first connecting portion 1321 is provided at the second end of the cantilever portion 122, and the hole on the second end of the cantilever portion 122 is hingedly connected to the hole on the groove wall of the mounting groove 1323, thereby realizing The first connecting portion 1321 is rotationally connected to the sliding member 120, and the cantilever portion 122 extends into the mounting groove 1323, making the structure of the cutter head changing mechanism 100 more compact and reducing the volume of the cutter head changing mechanism 100; on the other hand, the mounting groove 1323 will play a guiding and limiting role on the cantilever portion 122, so that the sliding member 120 can only move in a straight line along the extension direction of the mounting groove 1323, thereby preventing the sliding member 120 from rotating outside the fixing member 110, ensuring the stability of the movement direction of the sliding member 120, reducing the possibility of the cutter head changing mechanism 100 getting stuck, and improving the accuracy of the change of direction of the cutter head 200.

[0085] Optionally, the fixing member 110 includes:

[0086] The fixed support portion 111 is sleeved on the outside of the inner blade assembly 300, and the sliding support portion 121 is slidably sleeved on the outside of the fixed support portion 111; and

[0087] The fixed connection portion 112 is disposed on one side of the fixed support portion 111 close to the direction-changing support portion 131 and is sleeved with the curved support portion 132 .

[0088] Reference Figure 6 In this embodiment, the fixing member 110 includes a fixing support portion 111 and a fixing connection portion 112. The fixing support portion 111 is sleeved on the outside of the inner blade assembly 300 to isolate the rotating inner blade assembly 300 and improve the safety of the cutter head changing mechanism 100. Figure 1 , Figure 2 and Figure 6 The curved support portion 132 and the fixed connection portion 112 are sleeved, and the curved support portion 132 can be sleeved on the outside of the fixed connection portion 112, or the fixed connection portion 112 can be sleeved on the outside of the curved support portion 132, both of which can improve the ability of the cutter head changing mechanism 100 to resist lateral loads. In this embodiment, the fixing member 110 has a simple structure and is easy to manufacture, which reduces the difficulty of assembling the cutter head changing mechanism 100 and improves the production efficiency of the cutter head changing mechanism 100. Specifically in this embodiment, combined with Figure 4 , Figure 5 as well as Fig.14The bending support part 132 is tubular, and a side wall of the bending support part 132 is provided with an avoidance notch 1324. When the bending support sleeve 130 and the cutter head 200 perform a pitching motion to change the orientation, the fixed connection part 112 can extend into the avoidance notch 1324, thereby avoiding the interference between the wall of the bending support part 132 and the fixed connection part 112, and ensuring that the bending support sleeve 130 can achieve a predetermined pitch angle. The second connection part 1322 is a hole provided on the wall of the bending support part 132, and a corresponding hole is provided on the fixed connection part 112. The hole on the bending support part 132 is hinged with the hole on the fixed connection part 112, thereby realizing the rotation connection between the bending support part 132 and the fixing member 110, and then realizing the pitching motion of the bending support sleeve 130.

[0089] Optionally, the fixed support portion 111 includes a first pipe segment 1111 and a second pipe segment 1112, the second pipe segment 1112 connects the first pipe segment 1111 and the fixed connection portion 112, the sliding support portion 121 is slidably sleeved on the outside of the first pipe segment 1111, the outer diameter of the second pipe segment 1112 is larger than the outer diameter of the first pipe segment 1111 to form a first step structure 11101, and the sliding stroke of the sliding support portion 121 is limited by the first step structure 11101.

[0090] Reference Figure 3 , Figure 4 and Figure 6 In this embodiment, the fixed support part 111 includes a first pipe section 1111 and a second pipe section 1112, and the sliding support part 121 is sleeved on the outside of the first pipe section 1111. The outer diameter of the second pipe section 1112 is greater than the outer diameter of the first pipe section 1111, thereby forming a first step structure 11101. When the sliding support part 121 slides on the first pipe section 1111, the first step structure 11101 can prevent the sliding support part 121 from continuing to slide toward the direction close to the cutter head 200, thereby limiting the sliding stroke of the sliding support part 121, and thus limiting the rotation angle of the bending support sleeve 130, thereby playing a role in limiting the turning angle of the cutter head 200. By setting different outer diameters for the fixed part 110 to limit the position of the sliding part 120, the structure is simple and the manufacturing difficulty is low. In addition, the second pipe section 1112 with a thicker outer diameter has a higher strength, which reduces the possibility of damage to the fixed part 110 and prolongs the service life of the cutter head turning mechanism 100.

[0091] Optionally, the second pipe segment 1112 is axially provided with a guide groove 11121 penetrating through an outer wall of one side of the second pipe segment 1112 , and the cantilever portion 122 is slidably arranged in the guide groove 11121 .

[0092] Reference Figure 1 , Figure 2 and Figure 6In this embodiment, the second pipe section 1112 is provided with a guide groove 11121, and the cantilever part 122 slides along the guide groove 11121. The guide groove 11121 is provided to limit the sliding of the cantilever part 122, and then to limit the sliding of the sliding member 120, so as to prevent the sliding member 120 from rotating outside the fixing member 110, ensure the stability of the movement direction of the sliding member 120, reduce the possibility of the tool head changing mechanism 100 getting stuck, and improve the accuracy of the tool head 200 changing direction. On the other hand, the cantilever part 122 slides in the guide groove 11121 provided on the outer wall of the second pipe section 1112, so that the structure between the sliding member 120 and the fixing member 110 is more compact. Figure 6 The outer wall of the first pipe section 1111 is provided with a flat square structure 11111, and the flat square structure 11111 and the guide groove 11121 are arranged on the same side of the fixing member 110, and then combined with Figure 3 and Figure 7 The second end of the cantilever portion 122 is thicker. When the sliding member 120 and the fixing member 110 are assembled, the flat square structure 11111 can avoid the second end of the cantilever portion 122 to avoid interference between the cantilever portion 122 and the fixed support portion 111, thereby ensuring that the sliding member 120 is smoothly mounted on the outside of the fixing member 110.

[0093] Optionally, one of the outer peripheral wall of the cutter head 200 and the inner wall of the bending support sleeve 130 is provided with a limiting protrusion 141, and the other corresponding limiting protrusion 141 in the outer peripheral wall of the cutter head 200 and the inner wall of the bending support sleeve 130 is provided with a limiting groove 142, and the limiting protrusion 141 is inserted into the limiting groove 142 to prevent the cutter head 200 from moving axially along the bending support sleeve 130.

[0094] In this embodiment, the limiting protrusion 141 and the limiting groove 142 cooperate to form a limiting structure, so that the cutter head 200 cannot move along the axial direction of the bending support sleeve 130, improve the accuracy of the bending support sleeve 130 driving the cutter head 200 to change direction when rotating, and avoid the problem of damaging the connection between the cutter head 200 and the inner blade rod assembly 300 due to the bending support sleeve 130 driving the cutter head 200 to change direction. The limiting protrusion 141 can be set on the outer peripheral wall of the cutter head 200, and the limiting groove 142 can be set on the inner wall of the bending support sleeve 130, or the limiting groove 142 can be set on the outer peripheral wall of the cutter head 200, and the limiting protrusion 141 can be set on the inner wall of the bending support sleeve 130. The limiting protrusion 141 is inserted into the inner part of the limiting groove 142 so that the cutter head 200 cannot move axially relative to the bending support sleeve 130. The limiting accuracy is high, the limiting structure is not easy to be damaged, and the structure is simple, easy to manufacture, and the cost is low.

[0095] Optionally, the inner wall of the bending support sleeve 130 is provided with a second step structure 1301, and the cutter head changing mechanism 100 also includes a first limiting member 150, which is fixed to the inner wall of the bending support sleeve 130 and is spaced apart from the second step structure 1301. The inner wall of the bending support sleeve 130, the second step structure 1301 and the first limiting member 150 together surround and form a limiting groove 142.

[0096] Reference Figures 9 to 11 In this embodiment, the limiting groove 142 is arranged inside the bending support sleeve 130, and the limiting protrusion 141 is arranged on the outer peripheral wall of the cutter head 200. A second step structure 1301 is arranged on the inner wall of the bending support sleeve 130, and a first limiting member 150 is arranged at one end of the bending support sleeve 130 away from the sliding member 120. The first limiting member 150 can be fixed to the inner wall of the bending support sleeve 130 by welding or screwing. The first limiting member 150 and the second step structure 1301 are arranged at intervals, so that the inner wall of the bending support sleeve 130, the first limiting member 150 and the second step structure 1301 together surround and form the limiting groove 142. During assembly, the cutter head 200 is first installed into the interior of the bending support sleeve 130, so that the limiting protrusion 141 on the outer peripheral wall of the cutter head 200 is close to the second step structure 1301, and then the first limiting member 150 is fixed to the inner wall of the bending support sleeve 130, so that the first limiting member 150 and the second step structure 1301 are located on both sides of the limiting protrusion 141 on the cutter head 200, and the axial movement of the cutter head 200 along the bending support sleeve 130 is blocked by the first limiting member 150 and the second step structure 1301 respectively. Figure 5 and Fig.13 , Fig.13 There is no need to open a mounting hole on the middle bending support sleeve 130, and the setting of the limiting groove 142 has little effect on the strength of the bending support sleeve 130; Fig.11 The setting of the limiting protrusion 141 improves the strength of the cutter head 200, making the cutter head 200 less likely to break, thereby extending the service life of the medical change-direction knife.

[0097] Optionally, the first limiting member 150 is annular, sleeved on the outside of the cutter head 200 and fixedly connected to the bending support sleeve 130 .

[0098] In this embodiment, the first limiting member 150 is annular. The annular first limiting member 150 is easier to operate and convenient to fix when connected to the bending support sleeve 130 by welding or screwing. In addition, when the annular first limiting member 150 blocks the axial movement of the cutter head 200, the force is more uniform and it is not easy to be damaged.

[0099] Optionally, the first position-limiting member 150 includes a plurality of sub-position-limiting bodies 151 , each of which is arc-shaped, and the plurality of sub-position-limiting bodies 151 are assembled to form the first position-limiting member 150 .

[0100] Combination Fig. 9 and Fig.12 In this embodiment, the first limiting member 150 includes a plurality of arc-shaped sub-limiting bodies 151. The first limiting member 150 is formed by splicing a plurality of arc-shaped sub-limiting bodies 151, which makes assembly more convenient and avoids the problem that the integrated first limiting member 150 is blocked by the limiting protrusion 141 and is difficult to be mounted on the outside of the cutter head 200. Specifically, in this embodiment, the tail end of the cutter head 200 is first inserted into the curved support sleeve 130 so that the limiting protrusion 141 on the cutter head 200 is close to the second step structure 1301, and then the sub-limiting body 151 is welded to the curved support sleeve 130 so that the sub-limiting body 151 is fixed on the side of the limiting protrusion 141 away from the second step structure 1301.

[0101] Optionally, the first limiting member 150 includes:

[0102] The limiting portion 1501 is sleeved on the outer circumference of the cutter head 200 at intervals, one end of the limiting portion 1501 is spaced apart from the second step structure 1301, and the other end of the limiting portion 1501 extends to the outside of the bending support sleeve 130; and

[0103] The mounting portion 1502 is disposed at one end of the limiting portion 1501 away from the second step structure 1301 , and connects one end of the bending support sleeve 130 away from the fixing member 110 and the limiting portion 1501 .

[0104] Reference Fig.10 In this embodiment, the first limiting member 150 includes a limiting portion 1501 and a mounting portion 1502. The limiting portion 1501 is inserted into the interior of the bending support sleeve 130 and is spaced apart from the second step structure 1301. The limiting portion 1501, the second step structure 1301 and the inner wall of the bending support sleeve 130 form a limiting groove 142. The mounting portion 1502 is located outside the bending support sleeve 130 and is fixed to the bending support sleeve 130, so that the first limiting member 150 itself is easy to assemble, ensuring that the first limiting member 150 is firmly connected to the bending support sleeve 130, thereby ensuring the limiting function of the tool head 200.

[0105] Optionally, the cutter head changing mechanism 100 further includes a second limit member 160 , one end of which is passed through the bending support sleeve 130 , and the other end of the second limit member 160 extends to the interior of the bending support sleeve 130 to form a limit protrusion 141 .

[0106] Reference Figure 3 , Fig.14 and Fig.15In this embodiment, the limiting groove 142 is provided on the outer peripheral wall of the cutter head 200, and the limiting protrusion 141 is provided on the bending support sleeve 130. One end of the second limiting member 160 is inserted into the limiting groove 142, and the other end of the second limiting member 160 extends to the inside of the bending support sleeve 130, thereby forming the limiting protrusion 141. Figure 3 and Figure 5 Specifically in this embodiment, a mounting hole is provided on the redirection support portion 131. After the cutter head 200 is inserted into the bending support sleeve 130, the second limiting member 160 passes through the mounting hole and is inserted into the limiting groove 142 of the outer peripheral wall of the cutter head 200. Then, the second limiting member 160 is welded and fixed to the bending support sleeve 130. The structure is simple and easy to assemble.

[0107] Optionally, the cutter head direction changing mechanism 100 further includes a sheath 170 , which is sleeved on the outside of the cutter head 200 and abuts against the inner wall of the curved support sleeve 130 .

[0108] In this embodiment, the cutter head changing mechanism 100 further includes a sheath 170, which is made of a self-lubricating copper alloy or a polymer wear-resistant material. The sheath 170 is disposed between the inner wall of the curved support sleeve 130 and the cutter head 200, separating the outer peripheral wall of the cutter head 200 from the inner wall of the curved support sleeve 130, thereby reducing the friction resistance of the cutter head 200 during rotation, thereby improving the smoothness of the rotation of the cutter head 200. Fig. 9 and Fig.10 Specifically in this embodiment, the sheath 170 is disposed between the limiting protrusion 141 and the second step structure 1301. The sheath 170 separates the limiting protrusion 141 and the second step structure 1301, further reducing the friction resistance during the rotation of the cutter head 200, thereby improving the smoothness of the rotation of the cutter head 200. Figure 3 and Fig.14 Specifically in this embodiment, a sheath 170 is provided on both sides of the second limiting member 160 .

[0109] The utility model also provides a medical direction-changing knife, comprising an inner knife bar assembly 300 and a knife head 200 connected to the inner knife bar assembly 300, and also comprising the above-mentioned knife head direction-changing mechanism 100, and:

[0110] Optionally, the medical change-direction knife further comprises:

[0111] The inner knife tube 500 is sleeved on the inner knife rod assembly 300, and the fixing member 110 is fixed to the inner knife tube 500;

[0112] The outer blade tube 600 is movably mounted on the outer portion of the inner blade tube 500, and the sliding member 120 is connected to the outer blade tube 600; and

[0113] The adjusting assembly 700 is driven and connected to the outer knife tube 600. The adjusting assembly 700 drives the sliding member 120 to slide through the outer knife tube 600. The axial movement of the sliding member 120 causes the bending support sleeve 130 and the cutter head 200 to pitch.

[0114] The specific structure of the cutter head changing mechanism 100 refers to the above-mentioned embodiment. Since the medical changing direction knife adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here. By adopting the above-mentioned cutter head changing mechanism 100, the cutter head 200 can face different directions, so as to facilitate surgical operations from different angles and improve the convenience and safety of the operation. The cutter head changing mechanism 100 has a small number of parts, and the sliding part 120 slides on the outside of the fixing part 110. The structure is simple and easy to manufacture and assemble, thereby reducing the manufacturing cost of the medical changing direction knife; on the other hand, the simple structure is not prone to failure during long-term use, and can maintain a stable changing function of the cutter head 200, improve the reliability of the cutter head changing mechanism 100, and extend the service life of the medical changing direction knife.

[0115] Combination Figure 3 , Figure 4 , Fig.16 as well as Fig.17 In this embodiment, the medical direction-changing knife further comprises a support handle 400, an inner knife tube 500, an outer knife tube 600 and an adjustment assembly 700. The inner knife rod assembly 300 is movably arranged on the support handle 400. The support handle 400 is provided to facilitate the user to take the medical direction-changing knife, thereby facilitating the assembly of the medical direction-changing knife and the driving handle. The inner knife tube 500 is fixed to the support handle 400, and the outer knife tube 600 is movably arranged on the outside of the inner knife tube 500, so that the outer knife tube 600 can move along the extension direction of the inner knife tube 500 (i.e., the axial direction of the inner knife tube 500). The fixed inner knife tube 500 separates the rotating inner knife rod assembly 300 and the sliding outer knife tube 600, so as to prevent the knife head 200 from interfering with the rotation and direction change of the knife head 200. The adjustment component 700 drives the outer knife tube 600 to slide axially along the inner knife tube 500, so that the sliding member 120 connected to the outer knife tube 600 slides axially along the fixing member 110. The adjustment component 700 can be threadedly connected or slidably connected to the support handle 400 to drive the outer knife tube 600 to slide through its own movement. The user controls the sliding of the outer knife tube 600 by operating the adjustment component 700, thereby controlling the sliding of the sliding member 120 of the tool head changing mechanism 100, which makes the operation easier.

[0116] 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 knife head changing direction mechanism, applied to a medical changing direction knife, characterized in that: The medical direction-changing knife comprises a knife head and an inner knife rod assembly, wherein the inner knife rod assembly is hingedly connected to the knife head to transmit torque to the knife head to drive the knife head to rotate and to enable the knife head to pitch relative to the axis of the medical direction-changing knife, and the knife head direction-changing mechanism comprises: A fixing member, sleeved on the outside of the inner knife rod assembly; a sliding member, movably disposed outside the fixing member and capable of axially moving relative to the fixing member; and A bending support sleeve is sleeved on the outside of the cutter head and the cutter head extends from one end of the bending support sleeve, and the other end of the bending support sleeve has a first connecting portion and a second connecting portion opposite to each other, the first connecting portion is rotatably connected to the sliding member, and the second connecting portion is rotatably connected to the fixing member, and the bending support sleeve and the cutter head are driven to pitch relative to the inner cutter bar assembly through the axial movement of the sliding member; Wherein, an avoidance gap is provided at one end of the bending support sleeve close to the fixing member and / or one end of the fixing member close to the bending support sleeve.

2. The cutter head changing mechanism according to claim 1, characterized in that: The bending support sleeve comprises: a direction-changing support portion, having a first end away from the fixing member and a second end close to the fixing member, wherein the cutter head is sleeved in the direction-changing support portion and extends out from the first end of the direction-changing support portion; and A curved support portion, provided at the second end of the direction-changing support portion, wherein the first connecting portion and the second connecting portion are both provided at the curved support portion; Wherein, the curved support portion is sleeved with the fixing piece.

3. The cutter head changing mechanism according to claim 2, characterized in that: The curved support portion is sleeved on one end of the fixing member close to the cutter head.

4. The cutter head changing mechanism according to claim 2, characterized in that: The sliding member comprises: A sliding support portion, slidably sleeved on the exterior of the fixing member; and The cantilever part has a first end and a second end, wherein the first end of the cantilever part is connected to the sliding support part, and the second end of the cantilever part extends in a direction away from the sliding support part and is rotatably connected to the first connection part.

5. The cutter head changing mechanism according to claim 4, characterized in that: The thickness of the first end of the cantilever portion is smaller than the thickness of the second end of the cantilever portion; and / or, The cantilever portion is provided with a concave curved surface, the concave curved surface is provided on a side of the cantilever portion facing the inner knife bar assembly and is recessed in a direction away from the inner knife bar assembly; and / or, The curved support portion is provided with a mounting groove, the mounting groove is provided at one end of the curved support portion away from the direction-changing support portion, and the first connecting portion is a hole provided on the wall of the mounting groove.

6. The cutter head changing mechanism according to claim 4, characterized in that: The fixing member comprises: A fixed support portion is sleeved on the outside of the inner knife bar assembly, and the sliding support portion is slidably sleeved on the outside of the fixed support portion; and The fixed connection portion is arranged on a side of the fixed support portion close to the direction-changing support portion and is sleeved with the curved support portion.

7. The cutter head changing mechanism according to claim 6, characterized in that: The fixed support portion includes a first pipe segment and a second pipe segment, the second pipe segment connects the first pipe segment and the fixed connection portion, the sliding support portion is slidably sleeved on the outside of the first pipe segment, the outer diameter of the second pipe segment is larger than the outer diameter of the first pipe segment to form a first step structure, and the sliding stroke of the sliding support portion is limited by the first step structure.

8. The cutter head changing mechanism according to claim 1, characterized in that: One of the outer peripheral wall of the cutter head and the inner wall of the curved support sleeve is provided with a limiting protrusion, and the other of the outer peripheral wall of the cutter head and the inner wall of the curved support sleeve is provided with a limiting groove corresponding to the limiting protrusion, and the limiting protrusion is inserted into the limiting groove to prevent the cutter head from moving axially along the curved support sleeve.

9. The cutter head changing mechanism according to claim 1, characterized in that: The cutter head changing mechanism further comprises a protective sleeve, which is sleeved on the outside of the cutter head and abuts against the inner wall of the curved support sleeve.

10. A medical direction-changing knife, comprising an inner knife bar assembly and a knife head drivingly connected to the inner knife bar assembly, characterized in that: It also includes the cutter head changing mechanism according to any one of claims 1 to 9, and: A support handle, wherein the inner blade assembly is inserted through the support handle; An inner knife tube is sleeved on the outside of the inner knife rod assembly and fixed to the support handle, and the fixing member is fixed to the inner knife tube; An outer knife tube is movably sleeved on the outside of the inner knife tube, and the sliding member is connected to the outer knife tube; An adjusting component is connected to the outer knife tube, and drives the outer knife tube to move axially through the adjusting component to drive the sliding member to move axially. The axial movement of the sliding member causes the bending support sleeve and the cutter head to pitch.

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