Machining jig for femoral condyles

Abstract

The application relates to a machining clamp, comprising a main body seat, a clamping mechanism and a locking mechanism, the clamping mechanism is movably connected with the main body seat, the clamping mechanism has a release position and a locking position relative to the main body seat, the clamping mechanism can move between the release position and the locking position, the clamping mechanism is configured to clamp a to-be-clamped piece in the locking position and release the to-be-clamped piece in the release position, the locking mechanism is arranged on the main body seat, and the locking mechanism is configured to lock the to-be-clamped piece moving to the locking position. The machining clamp can clamp the to-be-clamped piece such as the to-be-clamped piece, can carry the to-be-clamped piece from the release position to the locking position, enters the locking range of the locking mechanism, and can be locked by the locking mechanism, which is double fixation, so that the inner wall of the to-be-clamped piece is tightly attached to the corresponding surface of the main body seat through the double fixation, stable clamping is formed, and sufficient stability in machining is ensured.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a machining fixture for the femoral condyle. Background Technology

[0002] Artificial knee joint prostheses are mainly composed of three parts: the femoral condyle, the tibial liner, and the tibial support. The femoral condyle is usually manufactured by casting semi-finished products using cobalt, chromium, and molybdenum materials, and then further machining the articular surface of the femoral condyle. Cobalt, chromium, and molybdenum materials have good biocompatibility with the human body, but the materials are relatively expensive and have high hardness, making machining difficult. Therefore, the clamping stability of the femoral condyle during machining also has correspondingly high requirements, which is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0003] Therefore, it is necessary to provide a machining fixture for the femoral condyle to address the issue of improving the clamping stability of the femoral condyle during machining.

[0004] This invention provides a machining fixture, comprising:

[0005] Main body;

[0006] A clamping mechanism is movably connected to the main body. The clamping mechanism has a release position and a locking position relative to the main body. The clamping mechanism is movable between the release position and the locking position. The clamping mechanism is configured to clamp the workpiece to be clamped in the locking position and to release the workpiece to be clamped in the release position.

[0007] A locking mechanism is provided on the main body, and the locking mechanism is configured to lock the clamping member that has moved to the locking position.

[0008] In one embodiment, the main body is provided with a guide structure, and the clamping mechanism includes a gripper that is slidably connected to the guide structure. The gripper is configured to open or close as it slides along the guide structure.

[0009] In one embodiment, the guide structure is a guide groove formed on the main body, the guide groove having N guide ramps that are close to each other along a first direction, the gripper including N claw heads, each claw head being slidably connected to one of the guide ramps, the first direction being the extension direction of the guide groove, and N being an integer greater than or equal to 2.

[0010] In one embodiment, the guide groove has two guide ramps forming a V-shape, and the clamping mechanism includes two claws that provide clamping force along a second direction perpendicular to the first direction.

[0011] In one embodiment, the clamping mechanism further includes a driver that is driven connected to the two claws and is configured to drive the two claws to reciprocate along the first direction.

[0012] In one embodiment, the actuator is a cylinder, and the driving end of the cylinder is connected to the two claw heads; and / or,

[0013] The guide ramp and the claw head are respectively provided with a sliding block and a sliding groove that cooperate with each other. The claw head is slidably assembled on the guide ramp through the sliding block and the sliding groove.

[0014] In one embodiment, the locking mechanism includes at least one positioning part and / or at least one locking part, the positioning part and / or the locking part being used to provide a locking force in a third direction, the third direction being perpendicular to the first direction.

[0015] In one embodiment, the main body is provided with at least one positioning part and at least one locking part on both sides along the third direction. The positioning part is configured to connect with the clamping member that has moved to the locking position on one side of the main body, and the locking part is configured to lock the clamping member to the locking position on the other side of the main body.

[0016] In one embodiment, the locking portion includes a locking groove formed on the main body and a locking member elastically fitted in the locking groove, the locking member being configured to elastically move along the third direction for applying an elastic force to the clamped member.

[0017] In one embodiment, the locking part further includes a limiting member configured to limit the range of motion of the locking member within the locking groove.

[0018] The aforementioned machining fixture, wherein the clamping mechanism can clamp a workpiece to be clamped, which constitutes a first-order fixation, and the clamping mechanism has the function of moving on the main body, and can also carry the workpiece to be clamped from the release position to the locking position, or from the locking position to the release position. When the workpiece to be clamped moves to the locking position, it can enter the locking range of the locking mechanism and be locked by the locking mechanism, which constitutes a second-order fixation. Therefore, through the second-order fixation, the inner wall of the workpiece to be clamped can be tightly attached to the corresponding surface of the main body, forming a stable clamping and ensuring sufficient stability during machining. Attached Figure Description

[0019] Figure 1This is a three-dimensional structural diagram of the PS-type femoral condyle in the prior art;

[0020] Figure 2 This is a three-dimensional structural diagram of the CR-type femoral condyle in the prior art;

[0021] Figure 3 A first perspective view of a machining fixture for the femoral condyle provided in an embodiment of the present invention;

[0022] Figure 4 This is a second perspective view of a machining fixture for the femoral condyle provided in one embodiment of the present invention;

[0023] Figure 5 A top view of a machining fixture for the femoral condyle provided in one embodiment of the present invention;

[0024] Figure 6 For example Figure 5 A sectional view of the machining fixture for the femoral condyle shown in section AA;

[0025] Figure 7 For example Figure 6 A partially enlarged view (a) of the machining fixture used for the femoral condyle;

[0026] Figure 8 A three-dimensional structural schematic diagram of a clamping mechanism provided in one embodiment of the present invention;

[0027] Figure 9 A schematic diagram of the fixation state structure of the femoral condyle provided in one embodiment of the present invention;

[0028] Figure 10 For example Figure 9 A sectional view of the femoral condyle in its fixed state, as shown.

[0029] Figure 11 For example Figure 10 Partial sectional view b of the fixed structure of the femoral condyle;

[0030] Figure 12 This is a three-dimensional structural diagram of a locking part provided in one embodiment of the present invention;

[0031] Figure 13 A schematic diagram of the planar structure of the main body seat provided in one embodiment of the present invention;

[0032] Figure 14 For example Figure 13 The BB section view of the main body shown;

[0033] Figure 15 For example Figure 13 The C-plane sectional view of the main body shown.

[0034] Icon labels:

[0035] 001. PS-type femoral condyle; 002. CR-type femoral condyle;

[0036] 100. Main body; 200. Clamping mechanism; 300. Locking mechanism; 400. Guide structure;

[0037] 110. Equal height seat; 120. Bottom plate;

[0038] 210. Claw head; 220. Driver; 230. Connecting part;

[0039] 310. Positioning part; 320. Locking part;

[0040] 321. Locking groove; 322. Locking component; 323. Limiting component; 324. Elastic component;

[0041] 410. Guide groove; 420. Guide slope; 430. Slider; 440. Slide groove. Detailed Implementation

[0042] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0043] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0044] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0047] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening 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 possible implementation.

[0048] like Figure 1 and Figure 2 As shown, the femoral condyle includes PS-type femoral condyle 001 and CR-type femoral condyle 002, as... Figure 1 As shown, the PS-type femoral condyle 001 is characterized by its intercondylar box. The PS-type femoral condyle 001 is also known as a posteriorly stable femoral condyle. Figure 2 As shown, the CR-type femoral condyle 002 features a cylindrical column in its structural design. Depending on the specific model of the femoral condyle, appropriate clamps can be used to hold it based on its structural characteristics, thus meeting the fixation requirements during machining. To provide stable clamping of the femoral condyle during machining, this application provides the following technical solution. In this document, "femoral condyle" refers to a femoral condyle prosthesis.

[0049] See Figures 3 to 5As shown, an embodiment of the present invention provides a machining fixture, which includes a main body 100, a clamping mechanism 200, and a locking mechanism 300. The clamping mechanism 200 is movably connected to the main body 100 and has a release position and a locked position relative to the main body 100. The clamping mechanism 200 is movable between the release position and the locked position. The clamping mechanism 200 is configured to clamp a workpiece to be clamped in the locked position and to release the workpiece to be clamped in the release position. The locking mechanism 300 is disposed on the main body 100 and is configured to lock the workpiece to be clamped when it has moved to the locked position. This document uses the femoral condyle as an example to illustrate this machining fixture, but it is readily understood that this machining fixture can also be used to clamp other workpieces to be clamped, and is not limited to the femoral condyle, as long as they have similar structural features.

[0050] The main body 100 serves as the assembly base for the clamping mechanism 200 and the locking mechanism 300. The clamping mechanism 200 can be directly or indirectly assembled with the clamping mechanism 200 and the locking mechanism 300. The clamping mechanism 200 can clamp the femoral condyle, which is a first-level fixation. The clamping mechanism 200 also has the function of moving on the main body 100 and can carry the femoral condyle from the release position to the locking position, or from the locking position to the release position. When the femoral condyle moves to the locking position, it can enter the locking range of the locking mechanism 300 and be locked by the locking mechanism 300, which is a second-level fixation.

[0051] It should be noted that when the clamping mechanism 200 moves to the release position or the locking position, it can actively release or actively lock the femoral condyle, for example, through active electronic control. Alternatively, when the clamping mechanism 200 moves to the release position or the locking position, it can also be configured to passively and immediately release or lock the femoral condyle upon reaching either position. Those skilled in the art can choose the appropriate solution according to their needs, and no limitation is made here. The surface of the main body 100 can be formed into a structural shape adapted to the inner wall of the femoral condyle. Therefore, through double fixation, the inner wall of the femoral condyle can be tightly attached to the corresponding surface of the main body 100, forming a stable clamping and ensuring sufficient stability during machining.

[0052] The release position on the main body 100 indicates that when the clamping mechanism 200 moves the femoral condyle to this release position, the femoral condyle has moved away from the locking mechanism 300 located in the locking position, and will naturally disengage from the locking mechanism 300. At the same time, the femoral condyle is also freed from the clamping mechanism 200 in this position and is in a completely released state, which can be removed from the processing fixture. The locking position on the main body 100 indicates that when the clamping mechanism 200 moves the femoral condyle to this locking position, the femoral condyle enters the locking range of the locking mechanism 300 located in the locking position and can be locked by the locking mechanism 300. At the same time, in this locking position, the femoral condyle is also clamped by the clamping mechanism 200 and is in a double-locked state, which cannot be removed from the processing fixture.

[0053] The release position and the locking position on the main body 100 can be continuous or discontinuous. When the release position and the locking position are continuous, the clamping mechanism 200 can move from the release position to the locking position or from the locking position to the release position through continuous movement. For example, the clamping mechanism 200 can slide from the release position to the locking position along a continuous track or from the locking position to the release position. When the release position and the locking position are discontinuous, the clamping mechanism 200 cannot move from the release position to the locking position or from the locking position to the release position through continuous movement. For example, the clamping mechanism 200 can switch directly from the release position to the locking position or jump directly from the locking position to the release position. The specific discontinuous movement is not limited here. In short, the reciprocating movement of the clamping mechanism 200 between the release position and the locking position is not limited to various movement states, and those skilled in the art can choose according to their needs.

[0054] If the clamping mechanism 200 and the locking mechanism 300 are considered as one execution unit, then the main body 100 can be equipped with a single execution unit including the clamping mechanism 200 and the locking mechanism 300 as needed, or it can be equipped with two, three or any number of execution units including the clamping mechanism 200 and the locking mechanism 300. Depending on the number of execution units, multiple femoral condyles can be fixed and clamped at the same time. This can effectively reduce the manufacturing cost of the clamps, reduce the number of femoral condyle product changes, and thus indirectly improve the processing efficiency of femoral condyle products. When the main body 100 has two or more execution units, in order to ensure that the two or more execution units can be horizontal to each other when fixing and clamping the condyle of the limb, the main body 100 can be assembled on the base plate 120 by multiple equal height seats 110. The equal height seats 110 can provide the same height at different positions of the main body 100 and form a uniform fixation through the base plate 120, so that the main body 100 is kept in a parallel state relative to the base plate 120. Therefore, after the base plate 120 is placed on a horizontal surface, the main body 100 can maintain a horizontal state.

[0055] See Figures 6 to 8 As shown, in one embodiment, the main body 100 is provided with a guide structure 400, and the clamping mechanism 200 includes a gripper. The gripper is slidably connected to the guide structure 400, and the gripper is configured to open or close during sliding along the guide structure 400. The guide trajectory formed by the guide structure 400 passes through the release position and the locking position. The clamping mechanism 200 is slidably mounted on the guide structure 400 along the guide trajectory. Therefore, when the clamping mechanism 200 slides along the guide trajectory of the guide structure 400, it can pass through the release position and the locking position, thus realizing the movement of the clamping mechanism 200 between the release position and the locking position. The guide structure 400 can be formed in various ways, such as directly forming a guide groove 410 or a guide protrusion on the main body 100, or providing independent additional components, such as guide rails, on the main body 100 to provide guidance for the clamping mechanism 200.

[0056] In one embodiment, the guide structure 400 is a guide groove 410 formed on the main body 100. The guide groove 410 has N guide ramps 420 that are close to each other along a first direction. The gripper includes N claw heads 210, each claw head 210 being slidably connected to one of the guide ramps 420. The first direction is the extension direction of the guide groove 410, and N is an integer greater than or equal to 2. For example, the guide groove 410 has two guide ramps 420 forming a V-shape. The clamping mechanism 200 includes two claw heads 210 that provide clamping force along a second direction perpendicular to the first direction. In a preferred embodiment, the first direction is a vertical direction, and the second direction is a horizontal direction parallel to the extension direction of the main body 100.

[0057] A corresponding guide trajectory can be formed on the guide ramp 420. The formation of the guide trajectory is based on the ability to control the two claws 210 to open or close. Therefore, the guide trajectory can be an inclined direction along the vertical direction of the guide ramp 420 (e.g., Figure 6 and Figure 7 As shown in the vertical direction, this tilting direction allows the two claws 210 to separate and slide open to each other when moving upward along the guide slope 420, and to merge and slide close to each other when moving downward along the guide slope 420. In this way, the two claws 210 can slide open or slide close along the two guide slopes 420. At this time, the release position is formed at the corresponding position above the main body 100, and the locking position is formed at the corresponding position below the main body 100.

[0058] Since the two guide ramps 420 form a V-shape, when the two claws 210 slide along the guide trajectory formed by the guide ramps 420, the claws 210 on the left and right sides can maintain good co-movement. When clamping the femoral condyle product, the femoral condyle product can be clamped inwards in the downward and left and right directions at the same time, so as to firmly and stably clamp the femoral condyle product.

[0059] The guide trajectory formed on the guide slope 420 can be realized through various structural forms. For example, a sliding block 430 and a sliding groove 440 can be respectively provided on the guide slope 420 and the claw head 210. The claw head 210 is slidably assembled on the guide slope 420 through the sliding block 430 and the sliding groove 440. Alternatively, an independent additional component, such as a guide rail, can be provided on the guide slope 420 to provide guidance for the claw head 210.

[0060] Regarding the number of claws 210 in the clamping mechanism 200, in addition to having two opposing claws 210, three or four claws 210 can also be set as needed, and the guide groove 410 can be adapted to form multiple guide ramps 420 that can be adapted to sliding assembly. Those skilled in the art can choose to set according to their needs, and no limitation is made here.

[0061] The sliding of the two claws 210 on the guide structure 400 can be achieved manually or automatically. When implemented manually, for example, when an operator places the femoral condyle on the clamping mechanism 200, if the release position is upper and the locking position is lower, the operator pressing down on the femoral condyle will simultaneously apply force to the clamping mechanism 200, causing it to move downwards to the locking position and enter the locking range of the locking mechanism 300, where it will be locked. When implemented automatically, the clamping mechanism 200 also includes a driver 220, which is connected to the two claws 210. The driver 220 is configured to drive the two claws 210 to reciprocate along the first direction, thereby sliding open or close on the guide slope 420. The driver 220 can be any device capable of providing linear driving force, such as a cylinder, hydraulic cylinder, or lifting seat, as long as it has sufficient driving force; no limitation is made here. In one embodiment, the actuator 220 is a cylinder, and the driving end of the cylinder is connected to the two claws 210. For example, the driving end of the cylinder is provided with a connecting part 230, and the two claws 210 are movably mounted on the connecting part 230, and can open or close relative to each other on the connecting part 230. The claws 210 can be movably mounted on the connecting part 230 in any form, such as elastic assembly, sliding assembly, hinge assembly, etc., which are not limited here.

[0062] See Figures 9 to 15As shown, in one embodiment, the locking mechanism 300 includes at least one positioning part 310 and at least one locking part 320, or only one positioning part 310 or only one locking part 320 is provided. The positioning part 310 or the locking part 320 is used to provide a locking force in a third direction, which is perpendicular to the first direction, i.e., the third direction is also a horizontal direction. The positioning part 310 determines the position of the locking position on the main body 100. The positioning part 310 can employ protrusions or grooves that adapt to the corresponding inner wall of the femoral condyle, or magnetic attraction, to identify the femoral condyle once it reaches the locking position. The locking part 320 locks the femoral condyle in the locking position. The locking part 320 can adopt any structural form that restricts the movement of the femoral condyle, such as snap-fit, magnetic connection, or threaded connection. No specific limitation is made on the locking of the femoral condyle in the locking position. It is understood that "perpendicular" as used herein is not strictly mathematical vertical, but includes allowable errors in engineering. Furthermore, in a preferred embodiment, the third direction, the first direction, and the second direction are mutually perpendicular, which facilitates omnidirectional positioning of the clamped component.

[0063] Not only can the structural forms of the positioning part 310 and the locking part be arbitrarily selected, but the positions of the positioning part 310 and the locking part 320 on the main body 100 are also not specifically limited, as long as the positioning part 310 and the locking part 320 are in the locked position, and can perform both positioning and locking functions on the femoral condyle when it moves to the locked position, it is acceptable. In one embodiment, at least one positioning part 310 and at least one locking part 320 are respectively provided on both sides of the main body 100 along the third direction. Therefore, the positioning part 310 and the locking part 320 respectively apply action on both sides of the inner wall of the femoral condyle. The positioning part 310 can determine whether the femoral condyle has moved to the locked position on one side of the main body 100. At this time, the positioning part 310 is configured to connect with the femoral condyle that has moved to the locked position on one side of the main body 100. The locking part 320 is configured to lock the femoral condyle in the locked position on the other side of the main body 100.

[0064] In one embodiment, the locking part 320 includes a locking groove 321 formed on the main body 100 and a locking member 322 elastically fitted within the locking groove 321. The locking member 322 is configured to elastically move along the third direction to apply an elastic force to the clamped part. For example, the locking member 322 can elastically move along the depth direction of the locking groove 321 to apply an elastic external support force to the inner wall of the femoral condyle, capable of locking the femoral condyle. The elastic fitting of the locking member 322 can be achieved by an elastic member 324 connected to the inner cavity of the locking groove 321. For example, one end of the elastic member 324 is connected to the locking member 322, and the other end of the elastic member 324 is connected to the bottom of the inner cavity of the locking groove 321. The locking member 322, capable of applying an elastic external support force, can always keep the inner side of the femoral condyle product open, thereby keeping the femoral condyle product in a supported state during processing, ensuring rigidity and dimensional stability during processing.

[0065] When the positioning part 310 and the locking part 320 act on the inner wall of the femoral condyle, the clamping mechanism 200 is more conducive to clamping the inner wall of the femoral condyle. Therefore, the clamping mechanism 200 is more convenient to clamp on the intercondylar box of the femoral condyle in the PS type femoral condyle 001. After clamping the femoral condyle, the clamping mechanism 200 carries the femoral condyle to the locking position through the interaction between the positioning part 310 and the locking part 320 and the inner wall of the femoral condyle. Therefore, this kind of processing fixture is more suitable for clamping the PS type femoral condyle 001.

[0066] Although the locking member 322 moves elastically relative to the locking groove 321, in order to ensure that the locking member 322 only forms elastic abutment against the inner wall of the femoral condyle when it enters the locked position, without affecting the femoral condyle entering the release position, the range of elastic movement of the locking member 322 also needs to be adjusted. For example, in one embodiment, the locking part 320 further includes a limiting member 323, which is configured to limit the range of elastic movement of the locking member 322 within the locking groove 321. The limiting member 323 can be installed in the locking groove 321, and a limiting hole can be formed on the locking member 322. The limiting hole and the limiting member 323 form a limiting fit, limiting the range of movement of the limiting member 323. Therefore, the range of movement of the locking member 322 can be limited by the limiting hole, ensuring that the locking part 320 can stably lock the femoral condyle.

[0067] The technical features of the embodiments described above can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. It is easy to understand that if the part to be clamped, like a PS-type femoral condyle, has two opposing walls, and there is a block-like object similar to an intercondylar box between the opposing walls, this processing fixture can also be applied.

[0068] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A machining fixture for clamping the skeletal condyle, characterized in that, include: Main body; A clamping mechanism is movably connected to the main body. The clamping mechanism has a release position and a locking position relative to the main body. The release position is located above the locking position. The clamping mechanism is capable of moving in a vertical direction between the release position and the locking position. The clamping mechanism is configured to clamp the femoral condyle in the locking position and to release the femoral condyle in the release position. A locking mechanism is provided on the main body seat. The locking mechanism includes at least one positioning part and at least one locking part. The positioning part is used to determine that the femoral condyle has moved to the locking position. The locking part is used to lock the femoral condyle that has moved to the locking position in the locking position. The locking mechanism is configured to lock the femoral condyle that has moved to the locking position.

2. The machining fixture according to claim 1, characterized in that, The main body is provided with a guide structure, and the clamping mechanism includes a gripper. The gripper is slidably connected to the guide structure, and the gripper is configured to open or close during the sliding process along the guide structure.

3. The machining fixture according to claim 2, characterized in that, The guide structure is a guide groove formed on the main body. The guide groove has N guide ramps that are close to each other along a first direction. The gripper includes N claw heads, each of which is slidably connected to one of the guide ramps. The first direction is the extension direction of the guide groove, and N is an integer greater than or equal to 2.

4. The machining fixture according to claim 3, characterized in that, The guide groove has two guide ramps forming a V-shape, and the clamping mechanism includes two claws that provide clamping force along a second direction perpendicular to the first direction.

5. The machining fixture according to claim 4, characterized in that, The clamping mechanism further includes a driver that is driven to the two claws and is configured to drive the two claws to reciprocate along the first direction.

6. The machining fixture according to claim 5, characterized in that, The actuator is a cylinder, and the driving end of the cylinder is connected to the two claw heads; and / or, The guide ramp and the claw head are respectively provided with a sliding block and a sliding groove that cooperate with each other. The claw head is slidably assembled on the guide ramp through the sliding block and the sliding groove.

7. The machining fixture according to claim 6, characterized in that, The positioning part and / or the locking part are used to provide a locking force in a third direction, which is perpendicular to the first direction.

8. The machining fixture according to claim 7, characterized in that, The main body is provided with at least one positioning part and at least one locking part on both sides along the third direction. The positioning part is configured to connect with the femoral condyle, which has moved to the locking position, on one side of the main body. The locking part is configured to lock the femoral condyle in the locking position on the other side of the main body.

9. The machining fixture according to claim 7, characterized in that, The locking part includes a locking groove formed on the main body and a locking member elastically fitted in the locking groove. The locking member is configured to be elastically movable along the third direction for applying an elastic force to the femoral condyle.

10. The machining fixture according to claim 9, characterized in that, The locking part further includes a limiting member configured to limit the range of elastic movement of the locking member within the locking groove.

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