Cutter head orientation changing mechanism and medical cutter

Abstract

The present application relates to a cutter head orientation changing mechanism and a medical cutter. The cutter head orientation changing mechanism is applied to the medical cutter. The medical cutter comprises a cutter head (200) and an inner cutter holder assembly (300), wherein the inner cutter holder assembly (300) is hinged to the cutter head (200) so as to transmit torque to the cutter head (200) to drive the cutter head (200) to rotate and can perform a pitch movement relative to an axis of the medical cutter. The cutter head (200) orientation changing mechanism (100) comprises: a fixing member (110) which is sleeved outside the inner cutter holder assembly (300); a sliding member (120) which is slidably sleeved outside the fixing member (110) and axially movable relative to the fixing member (110); and a bendable support sleeve (130) which is sleeved outside the cutter head (200), the cutter head (200) extending out of one end of the bendable support sleeve (130), the other end of the bendable support sleeve (130) being provided with a first connection portion (1321) and a second connection portion (1322) which are opposite each other, the first connection portion (1321) being hinged to the sliding member (120), and the second connection portion (1322) being hinged to the fixing member (110).

Description

Cutting head changing mechanism and medical cutting tool

[0001] Related applications

[0002] This application claims priority to Chinese patent application entitled “Blade head changing mechanism and medical knife” filed on March 28, 2024, application number 2024103686276, the entire text of which is hereby incorporated by reference. Technical Field

[0003] The present application relates to the technical field of medical devices, and in particular to a cutter head changing mechanism and a medical cutter. Background Art

[0004] In orthopedic surgery, bone tissue often needs to be ground or drilled. 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.

[0005] A medical knife with a reversible blade head is currently available. The knife head comprises an inner blade assembly, a blade head, and a blade head reversing mechanism. 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 reversing mechanism comprises a reversing control tube, an outer blade tube, and a support sleeve. The blade head is sheathed within the support sleeve and extends from one end of the support sleeve. The reversing control tube is disposed between the inner blade assembly and the outer blade tube and is rotatably connected to the support sleeve. The reversing control tube is operated to move forward and backward, driving the support sleeve and the blade head within the support sleeve to pitch, thereby changing the blade head's orientation.

[0006] 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. Summary of the Invention

[0007] According to various embodiments of the present application, a cutter head direction changing mechanism and a medical cutter are provided.

[0008] In a first aspect, the present application provides a blade changing mechanism, applied to a medical knife, comprising a blade and an inner blade rod assembly, wherein the inner blade rod assembly is hingedly connected to the blade to transmit torque to the blade to drive the blade to rotate and enable pitching relative to the axis of the medical knife, the blade changing mechanism comprising:

[0009] A fixing member, sleeved on the outside of the inner knife rod assembly;

[0010] a sliding member, which is slidably sleeved on the exterior of the fixing member and is axially movable relative to the fixing member; and

[0011] 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. The other end of the bending support sleeve has a first connecting portion and a second connecting portion that are relatively arranged. The first connecting portion is hinged to the sliding member, and the second connecting portion is hinged to the fixing member. The axial movement of the sliding member drives the bending support sleeve and the cutter head to pitch relative to the inner tool rod assembly.

[0012] In one embodiment, the curved support sleeve comprises:

[0013] 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

[0014] 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;

[0015] Wherein, the curved support portion is sleeved with the fixing piece.

[0016] In one embodiment, the curved support portion is externally mounted on an end of the fixing member close to the cutter head.

[0017] In one embodiment, the sliding member comprises:

[0018] a sliding support portion, slidably sleeved on the exterior of the fixing member; and

[0019] The cantilever portion has a first end and a second end, wherein the first end of the cantilever portion is connected to the sliding support portion, and the second end of the cantilever portion extends in a direction away from the sliding support portion and is rotatably connected to the first connection portion.

[0020] In one embodiment, 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,

[0021] The cantilever portion is provided with an inwardly concave curved surface, the inwardly concave curved surface being provided on a side of the cantilever portion facing the inner tool bar assembly and being recessed in a direction away from the inner tool bar assembly; and / or,

[0022] The curved support portion is provided with a mounting groove, which 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 wall of the mounting groove.

[0023] In one embodiment, the fixing member comprises:

[0024] 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

[0025] 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.

[0026] In one embodiment, 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.

[0027] In one embodiment, the second pipe segment is provided with a guide groove along the axial direction and penetrating the outer wall of one side of the second pipe segment, and the cantilever portion is slidably arranged in the guide groove.

[0028] In one embodiment, 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.

[0029] In one embodiment, the inner wall of the bending support sleeve is provided with a second step structure, and the cutter head changing mechanism also includes a first limiting member, which is fixed to the inner wall of the bending support sleeve and spaced apart from the second step structure. The inner wall of the bending support sleeve, the second step structure and the first limiting member together surround and form the limiting groove.

[0030] In one embodiment, the first limiting member is annular, sleeved on the outside of the cutter head and fixedly connected to the curved support sleeve.

[0031] In one embodiment, the first limiting member includes a plurality of sub-limiting bodies, each of the sub-limiting bodies is arc-shaped, and the plurality of sub-limiting bodies are assembled to form the first limiting member.

[0032] In one embodiment, the first limiting member includes:

[0033] a limiting portion, sleeved at intervals on the outer circumference of the cutter head, one end of the limiting portion being spaced apart from the second step structure, and the other end of the limiting portion extending to the outside of the curved support sleeve; and

[0034] The mounting portion is provided at one end of the limiting portion away from the second step structure, and connects one end of the curved support sleeve away from the fixing member and the limiting portion.

[0035] In one embodiment, the cutter head changing mechanism further includes a second limiting member, one end of the second limiting member is passed through the bending support sleeve, and the other end of the second limiting member extends to the interior of the bending support sleeve to form the limiting protrusion.

[0036] In a second aspect, a medical knife of the present application includes an inner knife bar assembly and a knife head transmission-connected to the inner knife bar assembly, and also includes the above-mentioned knife head direction-changing mechanism, as well as:

[0037] A support handle, wherein the inner shank assembly is passed through the support handle;

[0038] 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;

[0039] 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;

[0040] 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the disclosed drawings without any creative work.

[0042] FIG1 is a structural diagram of a first embodiment of a cutter head direction-changing mechanism of the present application;

[0043] FIG2 is a second structural diagram of the cutter head direction-changing mechanism according to the first embodiment of the present invention;

[0044] FIG3 is a cross-sectional view of a portion of the structure of the first embodiment of the medical knife of the present application;

[0045] FIG4 is a second cross-sectional view of a portion of the structure of the first embodiment of the medical knife of the present application;

[0046] FIG5 is a schematic structural diagram of a curved support sleeve of a cutter head changing mechanism according to a first embodiment of the present invention;

[0047] FIG6 is a schematic structural diagram of a fixing member of the cutter head changing mechanism according to the first embodiment of the present application;

[0048] FIG7 is a cross-sectional view of a sliding member of the cutter head changing mechanism according to the present application;

[0049] FIG8 is a schematic structural diagram of a sliding member of the cutter head changing mechanism according to the first embodiment of the present application;

[0050] FIG9 is a cross-sectional view of a portion of the structure of the second embodiment of the medical knife of the present application;

[0051] FIG10 is a cross-sectional view of a portion of the structure of the second embodiment of the cutter head changing mechanism of the present application;

[0052] FIG11 is a schematic structural diagram of a cutter head of a second embodiment of the medical cutter of the present application;

[0053] FIG12 is a schematic structural diagram of a sub-limiting body of the first limiting member of the cutter head changing mechanism according to the second embodiment of the present application;

[0054] FIG13 is a schematic structural diagram of a curved support sleeve of a second embodiment of a cutter head direction-changing mechanism of the present application;

[0055] FIG14 is a cross-sectional view of a portion of the structure of the cutter head changing mechanism according to the first embodiment of the present invention;

[0056] FIG15 is a schematic structural diagram of a cutter head of a first embodiment of a medical cutter of the present application;

[0057] FIG16 is a cross-sectional view of the first embodiment of the medical knife of the present application;

[0058] FIG17 is a third cross-sectional view of a portion of the structure of the first embodiment of the medical knife of the present application.

[0059] Figure numerals: 100, cutter head changing mechanism; 110, fixing member; 11, fixed support portion; 11101, first step structure; 1111, first pipe section; 1112, second pipe section; 11121, guide groove; 112, fixed connection portion; 120, sliding member; 121, sliding support portion; 122, cantilever portion; 1221, concave surface; 130, bending support sleeve; 1301, second step structure; 131, changing support portion; 132, bending support portion; 1321, first Connecting part; 1322, second connecting part; 1323, mounting groove; 141, limiting protrusion; 142, limiting groove; 150, first limiting member; 151, sub-limiting body; 1501, limiting part; 1502, mounting part; 160, second limiting member; 170, sheath; 200, cutter head; 300, inner knife rod assembly; 400, support handle; 500, inner knife tube; 600, outer knife tube; 700, adjustment assembly; 1324, avoidance gap; 11111, flat square structure. DETAILED DESCRIPTION

[0060] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0061] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0062] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0063] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0064] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0065] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0066] The present application proposes a cutter head direction changing mechanism.

[0067] 1 to 4 , FIG1 is a structural schematic diagram 1 of a first embodiment of a cutter head direction-changing mechanism of the present application, FIG2 is a structural schematic diagram 2 of a first embodiment of a cutter head direction-changing mechanism of the present application, FIG3 is a sectional view 1 of a partial structure of the first embodiment of a medical knife of the present application, and FIG4 is a sectional view 2 of a partial structure of the first embodiment of a medical knife of the present application.

[0068] In an embodiment of the present application, the cutter head direction changing mechanism 100 is applied to a medical knife. The medical knife includes a cutter head 200 and an inner cutter bar assembly 300. The inner cutter bar 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 knife. The cutter head direction changing mechanism 100 includes:

[0069] The fixing member 110 is sleeved on the outside of the inner blade assembly 300;

[0070] The sliding member 120 is slidably mounted on the exterior of the fixing member 110 and is axially movable relative to the fixing member 110; and

[0071] The 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 that are relatively arranged. The first connecting portion 1321 is hinged to the sliding member 120, and the second connecting portion 1322 is hinged to the fixing member 110. The axial movement of the sliding member 120 drives the bending support sleeve 130 and the cutter head 200 to pitch relative to the inner tool rod assembly 300.

[0072] A blade changing mechanism 100 in a technical solution of an embodiment of the present application is applied to a medical knife, which includes a blade 200 and an inner blade rod assembly 300. The inner blade rod assembly 300 drives the blade 200 to rotate, so that the blade 200 performs operations such as cutting, grinding, or drilling, and the blade 200 can rotate relative to the inner blade rod assembly 300, so that the blade 200 can rotate 360 ​​degrees, and the blade changing mechanism 100 can change the blade 200 to different directions, thereby facilitating surgical operations from different angles. The blade changing mechanism 100 includes a fixing part 110, a sliding part 120 and a bending support sleeve 130. The fixing part 110 is sleeved on the outside of the inner blade rod assembly 300 to play a supporting role. The sliding part 120 is slidably sleeved on the outside of the fixing part 110, so that the sliding part 120 can slide along the axial direction of the fixing part 110. The bending support sleeve 130 is sleeved on the outside of the blade head 200. The bending support sleeve 130 has a first connection part 1321 and a second connection part 1322, wherein the first connection part 1321 is hinged to the sliding part 120, and the second connection part 1322 is hinged to the fixing part 110. When the sliding part 120 slides, the first connection part 1321 rotates around the second connection part 1322 under the drive of the sliding part 120, so that the bending support sleeve 130 rotates, thereby driving the blade head 200 inside the bending support sleeve 130 to rotate, realizing the function of adjusting the direction of the blade head 200, improving the convenience of surgical operation, and making the surgical angle more flexible. The tool head direction changing mechanism 100 can be applied to a variety of medical cutting tools, such as medical milling cutters and medical sharpeners, and has a wide range of applications. The tool head direction changing mechanism 100 has a small number of parts, and the sliding member 120 slides outside the fixed member 110, resulting in a simple structure, thereby reducing the manufacturing difficulty of the tool head direction changing mechanism 100 and making it 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 direction of the tool head 200 are separated by the fixed fixed member 110, avoiding the problem of interference between the rotation of the tool head 200 and the direction of the tool head 200. On the other hand, compared with the existing technology, the sliding member 120 and the fixed member 110 have a simpler structure, are less difficult to manufacture, and are less likely to malfunction during long-term use, thereby improving the reliability of the tool head direction changing mechanism 100 and extending the service life of the tool head direction changing mechanism 100. Even if damaged, they are easy to repair and replace, reducing the cost of use.

[0073] In one embodiment, the curved support sleeve 130 includes:

[0074] 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 from the first end of the direction-changing support portion 131 ; and

[0075] The curved support portion 132 is provided 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 provided at the curved support portion 132 ;

[0076] The curved support portion 132 is sleeved with the fixing member 110 .

[0077] Referring to 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, and the first connecting portion 1321 and the second connecting portion 1322 are provided 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. 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. By sleeved connection, the curved support sleeve 130 and the fixing member 110 form an overlapping area in the radial direction of the cutter head 200, so that the connection between the fixing member 110 and the curved support sleeve 130 is tighter, and the lateral load resistance of the cutter head changing mechanism 100 is improved, thereby 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 knife, and improving the safety of the surgery.

[0078] In one embodiment, the curved support portion 132 is externally mounted on an end of the fixing member 110 close to the cutting head 200 .

[0079] 1 , 2 and 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 cutter head changing mechanism 100 and improves the production efficiency of the cutter head changing mechanism 100.

[0080] In one embodiment, the slider 120 includes:

[0081] The sliding support portion 121 is slidably mounted on the exterior of the fixing member 110; and

[0082] 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 connecting portion 1321 .

[0083] 1 , 2 , 7 and 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. The second end of the cantilever portion 122 is rotatably connected to the first connection 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 pitching motion around the second connection part 1322. The motion of the first connection part 1321 can be decomposed into an axial motion along the fixed part 110 and a radial motion along the fixed part 110. The axial movement of the sliding support part 121 along the fixed part 110 drives the cantilever part 122 to move, thereby realizing the axial movement of the first connection part 1321 along the fixed part 110. At the same time, the second end of the cantilever part 122 can be slightly deformed in the direction away from the fixed part 110, compensating for the radial movement of the first connection part 1321 along the fixed part 110, thereby avoiding the sliding part 120 and the bending support sleeve 130 from getting stuck, and realizing the pitching motion of the bending support sleeve 130 driven by the sliding part 120 that moves linearly. The structure is simple and the manufacturing cost is low.

[0084] In one 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; and / or,

[0085] The cantilever portion 122 is provided with an inwardly concave curved surface 1221, which is provided on a side of the cantilever portion 122 facing the inner tool bar assembly 300 and is recessed in a direction away from the inner tool bar assembly 300; and / or,

[0086] The curved support portion 132 defines a mounting groove 1323 . The mounting groove 1323 is located at one end of the curved support portion 132 away from the direction-changing support portion 131 . The first connection portion 1321 is a hole formed in a wall of the mounting groove 1323 .

[0087] 7 , in this embodiment, 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 , that is, the thickness of the end of the cantilever portion 122 connected to the sliding support portion 121 is smaller than the thickness of the end of the cantilever portion 122 connected to the bending support sleeve 130, thereby improving the elastic deformation ability 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 connection portion 1321, further reducing the possibility of the sliding member 120 and the bending support sleeve 130 getting stuck, thereby making the cutter head changing mechanism 100 smoother when moving, thereby improving the smoothness of the cutter head 200 changing direction.

[0088] Referring to 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. 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 part 120, and thereby extending the service life of the tool head changing mechanism 100.

[0089] 1 , 5 and 8 , in this embodiment, the curved support portion 132 is provided with a mounting groove 1323 , which 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 . 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 . 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 rotational connection between the first connecting part 1321 and the sliding member 120, and the cantilever part 122 extends into the installation 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 installation groove 1323 will play a guiding and limiting role on the cantilever part 122, so that the sliding member 120 can only move in a straight line along the extension direction of the installation groove 1323, avoiding 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.

[0090] In one embodiment, the fixing member 110 includes:

[0091] The fixed support portion 111 is sleeved on the outside of the inner knife bar assembly 300, and the sliding support portion 121 is slidably sleeved on the outside of the fixed support portion 111; and

[0092] The fixed connection portion 112 is disposed on a side of the fixed support portion 111 close to the direction-changing support portion 131 and is sleeved with the curved support portion 132 .

[0093] 6 , in this embodiment, the fixing member 110 includes a fixed support portion 111 and a fixed connection portion 112. The fixed support portion 111 is sleeved on the outside of the inner tool bar assembly 300, isolating the rotating inner tool bar assembly 300 inside, thereby improving the safety of the cutter head changing mechanism 100. In conjunction with FIG1 , FIG2 and FIG6 , the curved support portion 132 and the fixed connection portion 112 are sleeved. 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 can improve the ability of the cutter head changing mechanism 100 to resist lateral loads. The fixing member 110 in this embodiment has a simple structure and is easy to manufacture, which reduces the assembly difficulty of the cutter head changing mechanism 100 and improves the production efficiency of the cutter head changing mechanism 100. Specifically, in this embodiment, referring to Figures 4, 5, and 14, the bending support portion 132 is tubular, and a relief notch 1324 is provided on one side of the wall of the bending support portion 132. When the bending support sleeve 130 and the cutter head 200 perform pitching motion to change orientation, the fixed connection portion 112 can extend into the relief notch 1324, thereby preventing interference between the wall of the bending support portion 132 and the fixed connection portion 112, thereby ensuring that the bending support sleeve 130 can achieve a predetermined pitch angle. The second connection portion 1322 is a hole provided in the wall of the bending support portion 132, and a corresponding hole is provided in the fixed connection portion 112. The hole in the bending support portion 132 is hingedly connected to the hole in the fixed connection portion 112, thereby achieving a rotational connection between the bending support portion 132 and the fixed member 110, thereby achieving pitching motion of the bending support sleeve 130.

[0094] In one embodiment, 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.

[0095] 3, 4, and 6, in this embodiment, the fixed support portion 111 includes a first tube section 1111 and a second tube section 1112. The sliding support portion 121 is sleeved onto the exterior of the first tube section 1111. The outer diameter of the second tube section 1112 is greater than that of the first tube section 1111, thereby forming a first step structure 11101. When the sliding support portion 121 slides on the first tube section 1111, the first step structure 11101 prevents the sliding support portion 121 from sliding further toward the cutter head 200, thereby limiting the sliding travel of the sliding support portion 121 and, in turn, the rotation angle of the bending support sleeve 130, thereby limiting the direction change angle of the cutter head 200. By setting different outer diameters for the fixed member 110 to limit the position of the sliding member 120, the structure is simple and the manufacturing difficulty is low. Furthermore, the second tube section 1112 with a larger outer diameter provides higher strength, reducing the possibility of damage to the fixed member 110 and extending the service life of the cutter head direction change mechanism 100.

[0096] In one embodiment, the second tube section 1112 is provided with a guide groove 11121 along the axial direction and penetrating through the outer wall of one side of the second tube section 1112 , and the cantilever portion 122 is slidably arranged in the guide groove 11121 .

[0097] 1, 2, and 6, in this embodiment, the second pipe section 1112 is provided with a guide groove 11121, along which the cantilever portion 122 slides. The provision of the guide groove 11121 limits the sliding of the cantilever portion 122, and thus limits the sliding of the slider 120, preventing the slider 120 from rotating outside the fixed member 110. This ensures the stability of the movement direction of the slider 120, reduces the possibility of the cutter head direction changing mechanism 100 getting stuck, and improves the accuracy of the direction change of the cutter head 200. Furthermore, the cantilever portion 122 slides within the guide groove 11121 provided on the outer wall of the second pipe section 1112, making the structure between the slider 120 and the fixed member 110 more compact. 6 , a flat square structure 11111 is provided on the outer wall of the first pipe section 1111. The flat square structure 11111 and the guide groove 11121 are arranged on the same side of the fixing member 110. Combined with FIG3 and FIG7 , the second end of the cantilever portion 122 is thicker. When the sliding member 120 is assembled with the fixing member 110, the flat square structure 11111 can avoid the second end of the cantilever portion 122 to prevent the cantilever portion 122 from interfering with the fixed support portion 111, thereby ensuring that the sliding member 120 is smoothly sleeved on the outside of the fixing member 110.

[0098] In one embodiment, a limiting protrusion 141 is provided on one of the outer peripheral wall of the cutter head 200 and the inner wall of the bending support sleeve 130, and a limiting groove 142 is provided on the other corresponding limiting protrusion 141 on the outer peripheral wall of the cutter head 200 and the inner wall of the bending support sleeve 130. 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.

[0099] In this embodiment, the limiting protrusion 141 and the limiting groove 142 cooperate to form a limiting structure, which prevents the cutter head 200 from moving axially along the bending support sleeve 130, thereby improving the accuracy of the bending support sleeve 130 in driving the cutter head 200 to change direction when the bending support sleeve 130 rotates, and avoiding the problem of the connection between the cutter head 200 and the inner tool rod assembly 300 being damaged due to the bending support sleeve 130 driving the cutter head 200 to change direction. The limiting protrusion 141 can be provided on the outer peripheral wall of the cutter head 200 and the limiting groove 142 can be provided on the inner wall of the bending support sleeve 130, or the limiting groove 142 can be provided on the outer peripheral wall of the cutter head 200 and the limiting protrusion 141 can be provided on the inner wall of the bending support sleeve 130. The limiting protrusion 141 is inserted into the inner wall 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 low cost.

[0100] In one embodiment, 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 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.

[0101] 9 to 11 , in this embodiment, a limiting groove 142 is provided inside the bending support sleeve 130, and a limiting protrusion 141 is provided on the outer peripheral wall of the cutter head 200. A second step structure 1301 is provided on the inner wall of the bending support sleeve 130, and a first limiting member 150 is provided on an 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 is spaced apart from the second step structure 1301, so that the inner wall of the bending support sleeve 130, the first limiting member 150, and the second step structure 1301 collectively surround and form the limiting groove 142. During assembly, the cutting 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 cutting head 200 is close to the second step structure 1301. 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 cutting head 200. The axial movement of the cutting head 200 along the bending support sleeve 130 is respectively blocked by the first limiting member 150 and the second step structure 1301. In conjunction with Figures 5 and 13, in Figure 13, there is no need to provide a mounting hole on the bending support sleeve 130, and the provision of the limiting groove 142 has little effect on the strength of the bending support sleeve 130. Referring to Figure 11, the provision of the limiting protrusion 141 improves the strength of the cutting head 200, making the cutting head 200 less likely to break, thereby extending the service life of the medical knife.

[0102] In one embodiment, the first limiting member 150 is annular, sleeved on the outside of the cutter head 200 and fixedly connected to the curved support sleeve 130 .

[0103] 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.

[0104] In one embodiment, the first position-limiting member 150 includes a plurality of sub-position-limiting bodies 151 . Each sub-position-limiting body 151 is arc-shaped. The plurality of sub-position-limiting bodies 151 are assembled to form the first position-limiting member 150 .

[0105] 9 and 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 together 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 facing away from the second step structure 1301.

[0106] In one embodiment, the first stopper 150 includes:

[0107] The limiting portion 1501 is spaced apart and sleeved on the outer periphery of the cutter head 200 , 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 curved support sleeve 130 ; and

[0108] The mounting portion 1502 is provided 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 .

[0109] Referring to Figure 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.

[0110] In one embodiment, the cutter head changing mechanism 100 further includes a second limiting member 160 , one end of the second limiting member 160 is passed through the bending support sleeve 130 , and the other end of the second limiting member 160 extends to the interior of the bending support sleeve 130 to form a limiting protrusion 141 .

[0111] 3 , 14 and 15 , in this embodiment, a limiting groove 142 is provided on the outer peripheral wall of the cutter head 200, and a limiting protrusion 141 is provided on the bending support sleeve 130. One end of the second limiting member 160 is passed through the limiting groove 142, and the other end of the second limiting member 160 extends to the interior of the bending support sleeve 130, thereby forming the limiting protrusion 141. In conjunction with FIG3 and FIG5 , specifically in this embodiment, a mounting hole is provided on the direction-changing support portion 131. After the cutter head 200 is inserted into the interior of the bending support sleeve 130, the second limiting member 160 is inserted through the mounting hole into the limiting groove 142 on the outer peripheral wall of the cutter head 200, and then the second limiting member 160 is welded and fixed to the bending support sleeve 130. The structure is simple and easy to assemble.

[0112] In one embodiment, the cutter head direction changing mechanism 100 further includes a sheath 170 . The sheath 170 is sleeved on the outside of the cutter head 200 and abuts against the inner wall of the curved support sleeve 130 .

[0113] In this embodiment, the cutter head redirection mechanism 100 further includes a sheath 170. The sheath 170 is made of a self-lubricating copper alloy or a wear-resistant polymer 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. This reduces frictional resistance during the rotation of the cutter head 200, thereby improving the smoothness of the rotation of the cutter head 200. Referring to Figures 9 and 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 frictional resistance during the rotation of the cutter head 200, thereby improving the smoothness of the rotation of the cutter head 200. Referring to Figures 3 and 14, specifically in this embodiment, the sheath 170 is disposed on both sides of the second limiting member 160.

[0114] The present application further provides a medical knife, comprising an inner knife bar assembly 300 and a knife head 200 in transmission connection with the inner knife bar assembly 300, and also comprising the above-mentioned knife head direction changing mechanism 100, as well as:

[0115] In one embodiment, the medical knife further comprises:

[0116] 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;

[0117] 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

[0118] 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.

[0119] The specific structure of the blade changing mechanism 100 refers to the above-mentioned embodiments. Since the present medical knife adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, which will not be described in detail here. By adopting the above-mentioned blade changing mechanism 100, the blade 200 can be oriented in different directions, thereby facilitating surgical operations from different angles and improving the convenience and safety of the operation. The blade 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 knife. On the other hand, the simple structure is not prone to failure during long-term use, and can maintain a stable blade 200 changing function, thereby improving the reliability of the blade changing mechanism 100 and extending the service life of the medical knife.

[0120] 3, 4, 16, and 17, in this embodiment, the medical knife further comprises a support handle 400, an inner blade tube 500, an outer blade tube 600, and an adjustment assembly 700. The inner blade rod assembly 300 is movably mounted on the support handle 400. The support handle 400 facilitates user access to the medical knife, thereby facilitating assembly of the medical knife with the drive handle. The inner blade tube 500 is fixed to the support handle 400, and the outer blade tube 600 is movably mounted on the outer portion of the inner blade tube 500, allowing the outer blade tube 600 to move along the extension direction of the inner blade tube 500 (i.e., the axial direction of the inner blade tube 500). The stationary inner blade tube 500 separates the rotating inner blade rod assembly 300 and the sliding outer blade tube 600, preventing interference between the rotation and direction changes of the blade 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 part 120 connected to the outer knife tube 600 slides axially along the fixing part 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 part 120 of the cutter head changing mechanism 100, which makes the operation easier.

[0121] The above description is merely an optional embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structural transformation made by using the contents of the present application specification and drawings under the application concept of the present application, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present application.

Claims

1. A knife head changing mechanism, applied to medical knives, characterized in that: The medical 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 pitch relative to the axis of the medical 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, which is slidably sleeved on the exterior of the fixing member and is axially movable 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. The other end of the bending support sleeve has a first connecting portion and a second connecting portion that are relatively arranged. The first connecting portion is hinged to the sliding member, and the second connecting portion is hinged to the fixing member. The axial movement of the sliding member drives the bending support sleeve and the cutter head to pitch relative to the inner tool rod assembly.

2. The cutter head changing mechanism according to claim 1, characterized in that: The curved 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 externally mounted on an end of the fixing member close to the cutter head.

4. The cutter head changing mechanism according to claim 2, wherein: The sliding member comprises: a sliding support portion, slidably sleeved on the exterior of the fixing member; and The cantilever portion has a first end and a second end, the first end of the cantilever portion is connected to the sliding support portion, the second end of the cantilever portion extends in a direction away from the sliding support portion and is hinged to the first connecting portion, so that the curved support sleeve can rotate relative to the sliding member.

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.

6. The cutter head changing mechanism according to claim 4 or 5, characterized in that: The cantilever portion is provided with an inwardly concave curved surface, which 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.

7. The cutter head changing mechanism according to claim 4, characterized in that: The curved support portion is provided with a mounting groove, which is provided at one end of the curved support portion away from the direction-changing support portion. The first connecting portion is a hole provided on the wall of the mounting groove. The second end of the cantilever portion extends into the mounting groove and is hinged through the first connecting portion.

8. 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, 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, the first connecting portion is a hole provided on the wall of the mounting groove, the second end of the cantilever portion extends into the mounting groove and is hinged through the first connecting portion.

9. The cutter head changing mechanism according to claim 4, characterized in that: The cantilever portion is provided with a concave curved surface, which is provided on the side of the cantilever portion facing the inner knife rod assembly and is recessed in the direction away from the inner knife rod assembly. The curved support portion is provided with a mounting groove, which is provided at one end of the curved support portion away from the direction-changing support portion. The first connecting portion is a hole provided on the wall of the mounting groove, and the second end of the cantilever portion extends into the mounting groove and is hinged through the first connecting portion.

10. The cutter head changing mechanism according to any one of claims 7 to 9, characterized in that: The mounting groove is arranged along the axial direction of the curved support portion, and the first connecting portion passes through a groove wall of the mounting groove.

11. The cutter head changing mechanism according to claim 4, characterized in that: The fixing member includes: 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.

12. The cutter head changing mechanism according to claim 11, wherein: 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.

13. The cutter head changing mechanism according to claim 12, wherein: The second pipe section is provided with a guide groove penetrating through an outer wall of one side of the second pipe section along the axial direction, and the cantilever portion is slidably arranged in the guide groove.

14. The cutter head changing mechanism according to claim 1, wherein: 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.

15. The cutter head direction changing mechanism according to claim 14, wherein: The inner wall of the curved support sleeve is provided with a second step structure, and the cutter head changing mechanism also includes a first limiting member, which is fixed to the inner wall of the curved support sleeve and spaced apart from the second step structure. The inner wall of the curved support sleeve, the second step structure and the first limiting member together surround and form the limiting groove.

16. The cutter head direction changing mechanism according to claim 15, characterized in that: The first limiting member is annular, sleeved on the outside of the cutter head and fixedly connected to the curved support sleeve.

17. The cutter head direction changing mechanism according to claim 16, wherein: The first limiting member includes a plurality of sub-limiting bodies, each of which is arc-shaped, and the plurality of sub-limiting bodies are assembled to form the first limiting member.

18. The cutter head direction changing mechanism according to claim 15, wherein: The first limiting member includes: a limiting portion, sleeved at intervals on the outer circumference of the cutter head, one end of the limiting portion being spaced apart from the second step structure, and the other end of the limiting portion extending to the outside of the curved support sleeve; and The mounting portion is provided at one end of the limiting portion away from the second step structure, and connects one end of the curved support sleeve away from the fixing member and the limiting portion.

19. The cutter head direction changing mechanism according to claim 14, wherein: The cutter head changing mechanism further includes a second limiting member, one end of which is passed through the curved support sleeve, and the other end of which extends into the interior of the curved support sleeve to form the limiting protrusion.

20. A medical knife comprising an inner knife bar assembly and a knife head connected to the inner knife bar assembly, characterized in that: Also includes the cutter head changing mechanism according to any one of claims 1 to 19, and: A support handle, wherein the inner shank assembly is passed 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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