Bone defect modeling device and bone defect modeling system

Abstract

The embodiment of the invention provides a bone defect modeling device and a bone defect modeling system.The bone defect modeling device comprises a fixing mechanism and a positioning mechanism, the fixing mechanism is used for clamping limbs of an experimental animal, and an operation window is formed in a first fixing plate to expose an operation area; the positioning mechanism is integrated with a guide assembly capable of being adjusted in multiple dimensions, the guide assembly is movably connected to the adjusting assembly, and the adjusting assembly is used for adjusting and locking the position of the guide assembly, so that fine adjustment of the drilling position, three-dimensional adaptation of the drilling angle and rigid locking after adjustment are achieved. A guide channel is formed to form mechanical guidance and depth limitation on the drilling tool, and accurate control over the drilling depth is achieved. According to the device, experience dependence of bare-handed operation is abandoned, through integrated three-dimensional fine adjustment, rigid locking, mechanical guiding and depth limiting, the three-dimensional consistency of bone defect experiment modeling is guaranteed, the repeatability and standardization degree of modeling are improved, and a unified model foundation is provided for result evaluation of bone defect repair experiments.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a bone defect modeling device and a bone defect modeling system. Background Technology

[0002] In the field of experimental research and preclinical modeling related to bone defects, the accuracy of drilling operations directly determines the dimensional consistency of bone defect models and the reliability of experimental data. It is a key prerequisite for ensuring the validity of subsequent research results. How to improve the overall accuracy of drilling operations has become an urgent problem to be solved in the field of bone defect modeling. Summary of the Invention

[0003] This application provides a bone defect modeling device and a bone defect modeling system, which aim to improve the accuracy of drilling location.

[0004] The first aspect of this application provides a bone defect modeling device, including: a fixation mechanism and a positioning mechanism. The fixation mechanism includes a first fixation plate and a second fixation plate disposed opposite to each other, and the first fixation plate and the second fixation plate are movably disposed along directions of approaching and moving away from each other. An operation window is provided on the first fixation plate. The positioning mechanism includes a guide component and an adjustment component. The guide component is located on the side of the first fixation plate opposite to the second fixation plate, and the guide component is movably connected to the adjustment component. The adjustment component is used to adjust and lock the position of the guide component. The guide component has a guide channel located on the side of the operation window opposite to the second fixation plate. The guide channel and the operation window are used for passing a drilling tool, and the guide channel is used to limit the drilling depth and drilling angle of the drilling tool.

[0005] According to the embodiments of this application, the adjustment assembly includes an adjustment rod, a column, and a swing clamp. The adjustment rod is movably disposed along the axial direction of the adjustment rod. The column is connected to one end of the adjustment rod facing the first fixed plate. The axial direction of the column intersects with the axial direction of the adjustment rod. The swing clamp is rotatably connected to the column. The swing clamp is swayable about the axial direction of the column. A guide assembly is connected to the side of the swing clamp away from the column.

[0006] According to the embodiments of this application, the guide assembly includes a mounting cylinder and a guide sleeve. The guide sleeve is detachably disposed on the mounting cylinder and has a guide channel. A ball head is disposed on the outside of the mounting cylinder, and the mounting cylinder is rotatably connected to the swing clamping member through the ball head.

[0007] According to the embodiments of this application, the swing clamping member includes a first clamping piece and a second clamping piece disposed opposite to each other. Both the first clamping piece and the second clamping piece include an arc-shaped segment and a straight segment. The arc-shaped segment of the first clamping piece and the second clamping piece surrounds both sides of the column in the radial direction. An adjustment hole is provided on the straight segment. A ball head is located between the first clamping piece and the second clamping piece, and part of the ball head extends into the adjustment hole of the first clamping piece and the second clamping piece.

[0008] According to an embodiment of this application, a locking bolt is also provided on the straight section. The locking bolt is located between the adjustment hole and the arc section, and is used to lock the first clamping piece and the second clamping piece.

[0009] According to the embodiments of this application, the fixing mechanism includes a first arm and a second arm, which are hinged together. The end of the first arm is connected to a first fixing plate, and the end of the second arm is connected to a second fixing plate. The adjusting assembly further includes an adjusting support and a locking support. The adjusting rod is connected to the first arm through the adjusting support and the locking support. The adjusting support is provided with an adjusting element for adjusting the position of the adjusting rod, and the locking support is provided with a locking element for locking the adjusting rod.

[0010] According to an embodiment of this application, an adjusting rod passes through an adjusting support, and a rack is provided on the adjusting rod. The rack is located in the working cavity of the adjusting support. The adjusting component includes a first knob and a gear. The gear is located in the working cavity and meshes with the rack. The first knob extends from the outside of the adjusting support into the working cavity and is connected to the gear. The first knob and the gear are synchronously rotatable.

[0011] According to the embodiments of this application, the fixing mechanism further includes a support column and a support crossbar. The support crossbar is connected to the support column via a connecting seat. The connecting seat is movably disposed relative to the support column, and the support crossbar is movably disposed relative to the connecting seat. The second arm is connected to the support crossbar.

[0012] According to the embodiments of this application, the connecting seat has a first channel, a second channel, and a third channel. The first and second channels penetrate the connecting seat radially, and the third channel penetrates the connecting seat axially. The extending directions of the first and second channels intersect. A support column penetrates the first channel, and a support crossbar penetrates the second channel. The third channel includes a first opening and a second opening located at opposite ends of the axial direction of the connecting seat. The first opening is located on the side of the first channel away from the second channel, and the second opening is located on the side of the second channel away from the first channel. The fixing mechanism also includes a first locking part and a second locking part. The first locking part is located at the first opening. The first locking part is movably configured in the direction of approaching or moving away from the support column so that the support column has a first locked state and a first free state. In the first locked state, the first locking part abuts against the support column. In the first free state, the connecting seat is movably configured relative to the support column. The second locking part is movably configured in the direction of approaching or moving away from the support crossbar so that the support crossbar has a second locked state and a second free state. In the second locked state, the second locking part abuts against the support crossbar. In the second free state, the support crossbar is movably configured relative to the connecting seat.

[0013] According to the embodiments of this application, the first locking part includes a first locking knob and a first locking ring. The first locking ring is located in the first channel and sleeved on the outside of the support column. The first locking ring is threadedly connected to the first locking knob through a first opening. And / or, the second locking part includes a second locking knob and a second locking ring. The second locking ring is located in the second channel and sleeved on the outside of the support crossbar. The second locking ring is threadedly connected to the second locking knob through a second opening.

[0014] The second aspect of this application also provides a bone defect modeling system, including the bone defect modeling device of any of the first aspects described above. The bone defect modeling system includes a drilling tool, which includes a drill bit and a limiting ring. The limiting ring is sleeved on the outside of the drill bit. The drill bit is used to penetrate the guide channel and the operating window. The end of the limiting ring and the guide assembly opposite to the first fixed plate abuts against the drill bit to limit the drilling depth.

[0015] According to the embodiments of this application, the bone defect modeling device further includes a centering tube, which is used to pass through the guide channel. The wall of the centering tube is provided with graduations, and a spherical lens is provided at one end of the centering tube.

[0016] In the embodiments of this application, a first fixing plate and a second fixing plate are used to clamp the limbs of experimental animals. An operating window on the first fixing plate can precisely expose the target area for bone defect modeling, providing working space for drilling operations. A guide component is located on the side of the first fixing plate opposite to the second fixing plate and is movably connected to an adjustment component. The adjustment component is used to adjust and lock the position of the guide component, thereby achieving fine-tuning of the drilling position, three-dimensional adaptation of the drilling angle, and rigid locking after adjustment. The guide channel on the guide component corresponds to the operating window. The drilling tool can sequentially pass through the guide channel and the operating window to perform drilling. The guide channel can provide mechanical guidance and depth limitation for the drilling tool, achieving control over the drilling position, depth, and direction. The proximity of the first and second fixing plates ensures reliable fixation of the animal limbs, reducing problems such as misalignment or shaking caused by manual hand-held fixation. The operating window on the first fixing plate precisely defines the working area, reducing interference from surrounding tissues. This device eliminates the reliance on manual operation experience and ensures the three-dimensional consistency of bone defect experimental modeling through integrated three-dimensional fine-tuning, rigid locking, mechanical guidance and depth limitation, thereby improving the repeatability and standardization of modeling and providing a unified model basis for evaluating the results of bone defect repair experiments. Attached Figure Description

[0017] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings, wherein the same or similar reference numerals denote the same or similar features.

[0018] Figure 1This is a schematic diagram of the structure of a bone defect modeling device provided in an embodiment of this application; Figure 2 This is a partial structural schematic diagram of a bone defect modeling device provided in an embodiment of this application; Figure 3 This is a partial structural schematic diagram of the fixation mechanism of a bone defect modeling device provided in an embodiment of this application; Figure 4 This is a partial structural schematic diagram of another bone defect modeling device provided in an embodiment of this application; Figure 5 This is a partial structural schematic diagram of another bone defect modeling device provided in the embodiments of this application; Figure 6 This is a schematic diagram of the structure of the guide sleeve of a bone defect modeling device provided in an embodiment of this application; Figure 7 This is a partial structural schematic diagram of another bone defect modeling device provided in the embodiments of this application; Figure 8 This is a partial structural diagram of the positioning mechanism of a bone defect modeling device provided in an embodiment of this application; Figure 9 This is a schematic diagram of the mounting cylinder of a bone defect modeling device provided in an embodiment of this application; Figure 10 This is a schematic diagram of the swing clamping component of a bone defect modeling device provided in an embodiment of this application; Figure 11 This is a partial structural diagram of the positioning mechanism of another bone defect modeling device provided in this application embodiment; Figure 12 This is a partial structural schematic diagram of the fixation mechanism of another bone defect modeling device provided in this application embodiment; Figure 13 This is a partial structural schematic diagram of another bone defect modeling device provided in the embodiments of this application; Figure 14 This is a schematic diagram of the drilling tool of a bone defect modeling system provided in an embodiment of this application; Figure 15 This is a schematic diagram of the limiting ring structure of a bone defect modeling system provided in an embodiment of this application; Figure 16 This is a schematic diagram of the centering tube structure of a bone defect modeling system provided in an embodiment of this application.

[0019] Explanation of reference numerals in the attached figures: 100. Fixing mechanism; 110. First fixing plate; 111. Operating window; 112. Positioning reference hole; 120. Second fixing plate; 130. First arm; 140. Second arm; 141. Adjusting knob; 142. Clamping bolt; 143. Elastic element; 150. Support column; 160. Support crossbar; 170. Connecting seat; 171. First channel; 172. Second channel; 173. Third channel; 1731. First opening; 1732. Second opening; 180. First locking part; 181. First locking knob; 190. Second locking part; 191. Second locking knob; 192. Second locking ring; 200. Positioning mechanism; 210. Guide assembly; 211. Mounting cylinder; 212. Guide sleeve; 2121. Guide channel; 21 3. Guide locking knob; 215. Ball head; 220. Adjustment assembly; 221. Adjustment rod; 2211. Rack; 2212. Limiting block; 222. Column; 223. Swing clamping component; 2231. First clamping piece; 2232. Second clamping piece; 2233. Arc-shaped section; 2234. Straight section; 2235. Adjustment hole; 2236. Locking bolt; 2237. Second knob; 224. Adjustment support; 2241. First knob; 2242. Gear; 225. Locking support; 2251. Locking component; 2252. Locking sub-base; 300. Drilling tool; 310. Drill bit; 320. Limiting ring; 321. Locking screw; 400. Centering tube; 410. Spherical lens; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0020] The features and exemplary embodiments of various aspects of this application will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a comprehensive understanding of this application. However, it will be apparent to those skilled in the art that this application can be implemented without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of this application by illustrating examples. In the accompanying drawings and the following description, at least some well-known structures and techniques are not shown to avoid unnecessarily obscuring the application; and, for clarity, the dimensions of some structures may be exaggerated. Furthermore, the features, structures, or characteristics described below can be combined in any suitable manner in one or more embodiments.

[0021] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicating orientation or positional relationships are only for the convenience of describing this application 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, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the embodiments of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] In experimental procedures for bone defect modeling, there are often issues such as insufficient stability in the clamping and fixation when the surgeon holds the animal's limb with one hand or an assistant holds it, difficulty in accurately controlling the clamping balance, and inevitable swaying and displacement of the limb during the modeling process. At the same time, the accuracy of drilling guidance and positioning is easily affected by external forces, vibrations, and personnel technical factors, resulting in deviations that make it difficult to maintain uniformity in the position, angle, and depth of the drill holes. This leads to large modeling errors between different experimental samples, significantly reducing the standardization of bone defect models and the reproducibility of experimental data. How to improve the reliability of limb fixation and the accuracy of drilling operations during bone defect modeling has become an urgent problem to be solved.

[0024] like Figures 1 to 6 As shown in the first aspect embodiment of this application, a bone defect modeling device includes: a fixation mechanism 100 and a positioning mechanism 200. The fixation mechanism 100 includes a first fixation plate 110 and a second fixation plate 120 disposed opposite to each other. The first fixation plate 110 and the second fixation plate 120 are movably disposed along directions of approaching and moving away from each other. An operation window 111 is provided on the first fixation plate 110. The positioning mechanism 200 includes a guide component 210 and an adjustment component 220. The guide component 210 is located on the side of the first fixation plate 110 away from the second fixation plate 120. The guide component 210 is movably connected to the adjustment component 220. The adjustment component 220 is used to adjust and lock the position of the guide component 210. The guide component 210 has a guide channel 2121. The guide channel 2121 is located on the side of the operation window 111 away from the second fixation plate 120. The guide channel 2121 and the operation window 111 are used for the passage of a drilling tool 300. The guide channel 2121 is used to limit the drilling depth and drilling angle of the drilling tool 300.

[0025] In this embodiment, the first fixing plate 110 and the second fixing plate 120 are used to clamp the limbs of experimental animals. The first fixing plate 110 and the second fixing plate 120, which can move in the direction of approaching and moving away from each other, can adapt to experimental animal limbs of different sizes and clamp and fix them stably. At the same time, the operation window 111 opened on the first fixing plate 110 can accurately expose the target area of ​​bone defect modeling and provide working space for drilling operations. The guide component 210 is located on the side of the first fixing plate 110 opposite to the second fixing plate 120. The guide component 210 is movably connected to the adjustment component 220, which is used to adjust and lock the position of the guide component 210, thereby achieving fine-tuning of the drilling position, three-dimensional adaptation of the drilling angle, and rigid locking after adjustment. The guide channel 2121 opened in the guide component 210 corresponds to the operation window 111. The drilling tool 300 can pass through the guide channel 2121 and the operation window 111 in sequence to drill. The guide channel 2121 can provide mechanical guidance and depth limitation for the drilling tool 300, realizing control of the drilling position, depth, and drilling direction. The proximity of the first fixing plate 110 and the second fixing plate 120 achieves reliable fixation of the animal limbs, reducing the deviation caused by manual fixation. The operation window 111 on the first fixing plate 110 precisely defines the working range and reduces the interference of surrounding tissues on the surgical area operation. This device eliminates the reliance on manual operation experience and ensures the three-dimensional consistency of bone defect experimental modeling through integrated three-dimensional fine-tuning, rigid locking, mechanical guidance and depth limitation, thereby improving the repeatability and standardization of modeling and providing a unified model basis for evaluating the results of bone defect repair experiments.

[0026] The bone defect modeling device in this application embodiment can be applied not only to animal bone defect modeling experiments, but also to human disease treatment surgery, which can improve the accuracy of drilling position during surgery and reduce errors caused by manual operation.

[0027] Optional, such as Figure 2 and Figure 5 As shown, the first fixing plate 110 has multiple positioning reference holes 112, and the edge of the operating window 111 also has multiple positioning reference holes 112. These multiple positioning reference holes 112 are located around the operating window 111. After the animal limb is clamped and fixed by the first fixing plate 110 and the second fixing plate 120, the positioning reference holes 112 provide auxiliary references to the surgical area. For example, a probe can be inserted into the soft tissue of the animal limb through the positioning reference holes 112, facilitating the operator to calibrate the correspondence between the operating window 111 and the target bone surface, thus improving positioning efficiency.

[0028] Optionally, the first fixing plate 110 is provided with an elastic buffer layer on the side facing the second fixing plate 120, and the second fixing plate 120 is provided with an elastic buffer layer on the side facing the first fixing plate 110. The elastic buffer layer is used to conform to the animal's limb and reduce clamping injury.

[0029] Optionally, the first fixing plate 110 and the second fixing plate 120 are arc-shaped structures, with the second fixing plate 120 bent away from the first fixing plate 110 and the first fixing plate 110 bent towards the second fixing plate 120, which helps to improve the reliability of clamping animal limbs.

[0030] like Figure 1 , Figure 7 and Figure 8 As shown, in some optional embodiments, the positioning mechanism 200 includes an adjustment component 220, which includes an adjustment rod 221, a column 222, and a swing clamp 223. The adjustment rod 221 is movably disposed along its axial direction. The column 222 is connected to one end of the adjustment rod 221 facing the first fixed plate 110. The axial direction of the column 222 intersects the axial direction of the adjustment rod 221. The swing clamp 223 is rotatably connected to the column 222 and is swingable about the axial direction of the column 222. The guide component 210 is connected to the side of the swing clamp 223 away from the column 222.

[0031] In these optional embodiments, the adjusting rod 221 is movably disposed along its own axial direction, enabling the column 222 and the swing clamp 223 and guide assembly 210 connected to the column 222 to achieve linear displacement adjustment along the axial direction of the adjusting rod 221. The axial direction of the column 222 intersects the axial direction of the adjusting rod 221, and the axial direction of the column 222 can be perpendicular to the axial direction of the adjusting rod 221. The axial direction of the column 222 can be vertical, and the axial direction of the adjusting rod 221 can be horizontal. The swing clamp 223 is rotatably connected to the column 222 and can swing around the axis of the column 222, thereby driving the guide component 210 to swing synchronously. This allows for fine-tuning of the position of the guide component 210 in a plane perpendicular to the axis of the adjusting rod 221. Through the axial movement of the adjusting rod 221 and the swing of the swing clamp 223, the guide component 210 can be adjusted in multiple dimensions. This adapts to individual differences in the anatomical structure of experimental animals' limbs, ensuring that the guide channel 2121 can accurately align with the target site for bone defect modeling. This improves the consistency of drilling position, drilling depth, and drilling angle, significantly reducing the difficulty of the surgery. Even less experienced operators can quickly and accurately complete the positioning, ensuring the three-dimensional consistency of the bone defect experimental model.

[0032] like Figure 6 and Figure 9As shown, in some optional embodiments, the guide assembly 210 includes a mounting cylinder 211 and a guide sleeve 212. The guide sleeve 212 is detachably disposed on the mounting cylinder 211. The guide sleeve 212 has a guide channel 2121. A ball head 215 is disposed on the outside of the mounting cylinder 211. The mounting cylinder 211 is rotatably connected to the swing clamp 223 through the ball head 215.

[0033] In these optional embodiments, the guide channel 2121 opened in the guide sleeve 212 provides motion trajectory constraints for the drilling tool 300. The drilling tool 300 moves along the extension direction of the guide channel 2121, thereby limiting the drilling direction. The guide sleeve 212 is detachably installed on the mounting cylinder 211 and can be flexibly replaced according to the specifications of the drill bit 310 required for the experiment. The mounting cylinder 211 is sleeved on the outside of the guide sleeve 212. A ball head 215 is provided on the outside of the mounting cylinder 211. The ball head 215 is rotatably connected to the swing clamp 223. The ball head 215 can achieve multi-angle rotation adjustment relative to the swing clamp 223, thereby adjusting the axial direction of the guide channel 2121 to adapt to the curved shape of the target bone surface such as the femoral condyle and different modeling angle requirements. It can accurately match the tilt angle of the target bone surface and ensure that the drilling direction is consistent with the preset angle of the bone surface.

[0034] Optional, such as Figure 6 and Figure 9 As shown, the guide sleeve 212 has a prism structure and a guide channel 2121 is provided in the middle of the guide sleeve 212. The inner wall of the mounting cylinder 211 is adapted to the shape of the outer wall of the guide sleeve 212 to restrict the rotation of the guide sleeve 212 relative to the mounting cylinder 211. For example, the guide sleeve 212 has a hexagonal prism structure, and the receiving space formed by the inner wall of the mounting cylinder 211 is a hexagonal prism structure. The inner wall of the mounting cylinder 211 restricts the rotation of the guide sleeve 212 relative to the mounting cylinder 211.

[0035] like Figure 6 and Figure 9 As shown, in some optional embodiments, the guide assembly 210 further includes a guide locking knob 213, which is threaded to the side wall of the mounting cylinder 211 and abuts against the outer peripheral surface of the guide sleeve 212. The guide locking knob 213 is used to lock the relative position of the guide sleeve 212 and the mounting cylinder 211.

[0036] In these optional embodiments, the guide locking knob 213 abuts against the guide sleeve 212 to lock the relative position of the guide sleeve 212 and the mounting cylinder 211, reducing the displacement of the guide sleeve 212 caused by vibration and friction of the drilling tool 300 during drilling. The threaded connection of the guide locking knob 213 can quickly complete the fixing and unlocking of the guide sleeve 212, making it convenient to flexibly replace guide sleeves 212 with different diameters of guide channels 2121 according to drilling specifications.

[0037] like Figure 7and Figure 10 As shown, in some optional embodiments, the swing clamping member 223 includes a first clamping piece 2231 and a second clamping piece 2232 disposed opposite to each other. Both the first clamping piece 2231 and the second clamping piece 2232 include an arc-shaped segment 2233 and a straight segment 2234. The arc-shaped segment 2233 of the first clamping piece 2231 and the second clamping piece 2232 surrounds both sides of the column 222 in the radial direction. An adjustment hole 2235 is provided on the straight segment 2234. A ball head 215 is located between the first clamping piece 2231 and the second clamping piece 2232, and part of the ball head 215 extends into the adjustment hole 2235 of the first clamping piece 2231 and the second clamping piece 2232.

[0038] In these optional embodiments, the first clamping piece 2231 and the second clamping piece 2232 of the swing clamping member 223 are disposed opposite each other on both sides of the column 222 in the radial direction. The arc-shaped segments 2233 of the first clamping piece 2231 and the second clamping piece 2232 surround both sides of the column 222 in the radial direction. The arc-shaped structure of the arc-shaped segments 2233 adapts to the outer surface of the column 222, ensuring the smoothness and stability of the swing clamping member 223 when swinging around the axial direction of the column 222. The straight segment 2234 is located on the side of the arc-shaped segment 2233 away from the column 222. The adjustment hole 2235 is used to accommodate part of the structure of the ball head 215. The ball head 215 is located between the first clamping piece 2231 and the second clamping piece 2232. The first clamping piece 2231 and the second clamping piece 2232 are used to clamp the ball head 215, realizing the rotatable connection between the mounting cylinder 211 and the swing clamping member 223. The risk of the ball head 215 falling off is reduced by the cooperative limiting of the first clamping piece 2231 and the second clamping piece 2232, which makes the mounting cylinder 211 more flexible to rotate at multiple angles, improving the accuracy and ease of operation of the positioning mechanism 200-dimensional adjustment.

[0039] Optional, such as Figure 8 and Figure 10 As shown, the outer peripheral surface of the column 222 and the inner surface of the arc segment 2233 facing the column 222 are both rough surfaces, which are used to increase the friction between the swing clamp 223 and the column 222.

[0040] Optional, such as Figure 10 As shown, the roughness of the inner surface of the arc segment 2233 facing the column 222 is greater than that of the straight segment 2234.

[0041] Optional, such as Figure 8 As shown, the roughness of the outer circumferential surface of the column 222 is greater than the roughness of the outer circumferential surface of the adjusting rod 221.

[0042] like Figure 7 and Figure 10As shown, in some optional embodiments, a locking bolt 2236 is also provided on the straight section 2234. The locking bolt 2236 is located between the adjustment hole 2235 and the arc section 2233. The locking bolt 2236 is used to lock the first clamping piece 2231 and the second clamping piece 2232.

[0043] In these optional embodiments, the locking bolt 2236 is disposed between the adjusting hole 2235 and the arc segment 2233. The locking bolt 2236 is connected to the first clamping piece 2231 and the second clamping piece 2232. By tightening the locking bolt 2236, the oppositely arranged first clamping piece 2231 and second clamping piece 2232 can be driven to move closer to each other, so that the arc segment 2233 fits tightly against the outer circumferential surface of the column 222, thereby locking the swing clamping member 223 and the column 222 together. The straight segment 2234 clamps and fixes the ball head 215 through the inner wall of the adjusting hole 2235, restricting the rotation of the ball head 215 and locking the position of the guide assembly 210 and the angle of the guide channel 2121. Loosening the locking bolt 2236 can release the constraint of the clamping piece on the column 222 and the ball head 215, allowing the swing angle and the direction of the guide channel 2121 to be readjusted. By loosening the locking bolt 2236, the first clamping piece 2231 and the second clamping piece 2232, which are arranged opposite to each other, can be driven to move away from each other. The arc segment 2233 can rotate relative to the outer circumferential surface of the column 222, and the ball head 215 can rotate relative to the adjustment hole 2235, thereby adjusting the swing position of the swing clamp 223 and the position of the mounting cylinder 211.

[0044] Optional, such as Figure 7 and Figure 10 As shown, a second knob 2237 is also provided on the straight section 2234. The second knob 2237 is located on the side of the second clamping piece 2232 opposite to the first clamping piece 2231. The locking bolt 2236 passes through the second clamping piece 2232 and is threadedly connected to the second knob 2237. Rotating the second knob 2237 causes the locking bolt 2236 to be screwed into the second knob 2237, so that the first clamping piece 2231 and the second clamping piece 2232 move closer to each other, which can simultaneously fix the swing position of the swinging clamping member 223 and the rotation angle of the ball head 215. One locking bolt 2236 can simultaneously limit the rotation of the swinging clamping member 223 and the rotation of the ball head 215, thereby improving the convenience of operation. The locking bolt 2236 locks the first clamping piece 2231 and the second clamping piece 2232, reducing the position and angle displacement caused by vibration during drilling, and ensuring the positioning accuracy and angle stability of the guide channel 2121.

[0045] like Figure 7 and Figure 8As shown, in some optional embodiments, the fixing mechanism 100 includes a first arm 130 and a second arm 140, which are hinged together. The end of the first arm 130 is connected to the first fixing plate 110, and the end of the second arm 140 is connected to the second fixing plate 120. The adjusting assembly 220 also includes an adjusting support 224 and a locking support 225. The adjusting rod 221 is connected to the first arm 130 through the adjusting support 224 and the locking support 225. The adjusting support 224 is provided with an adjusting member for adjusting the position of the adjusting rod 221, and the locking support 225 is provided with a locking member 2251 for locking the adjusting rod 221.

[0046] In these alternative embodiments, the first arm 130 and the second arm 140 are hinged together. The hinge point of the first arm 130 and the second arm 140 is located at the end of the first arm 130 and the second arm 140 away from the first fixing plate 110 and the second fixing plate 120. The first arm 130 and the second arm 140 can rotate relative to each other, causing the first fixing plate 110 and the second fixing plate 120 to move in a direction that approaches or moves away from each other, thereby adapting to the clamping and fixing needs of animal limbs of different sizes. The adjusting rod 221 of the adjusting assembly 220 is connected to the first arm 130 via the adjusting support 224 and the locking support 225. The adjusting member on the adjusting support 224 can drive the adjusting rod 221 to move along its own axial direction. The adjusting rod 221 moves relative to the adjusting support 224. The adjusting support 224 is connected to the first arm 130. The movement of the adjusting rod 221 relative to the first arm 130 causes the column 222, the swing clamp 223, and the guide assembly 210 to move along the axial direction of the adjusting rod 221, thereby adjusting the relative position between the guide assembly 210 and the operating window 111 on the first fixed plate 110. The locking member 2251 on the locking support 225 can lock and fix the adjusting rod 221 after it reaches the target position to prevent the adjusting rod 221 from shifting. The hinged design of the first arm 130 and the second arm 140 makes the opening and closing adjustment of the first fixing plate 110 and the second fixing plate 120 more flexible. The adjusting rod 221 is arranged side by side with the first arm 130, and the extension direction of the adjusting rod 221 is parallel to the extension direction of the first arm 130.

[0047] Optional, such as Figure 3As shown, a clamping adjustment assembly is provided between the first arm 130 and the second arm 140. The clamping adjustment assembly is connected to the first arm 130 and the second arm 140 and is used to adjust the distance between the first arm 130 and the second arm 140. The first arm 130 and the second arm 140 are arranged opposite each other along a third direction Z and extend along a first direction X. The clamping adjustment assembly includes an adjustment knob 141 and a clamping bolt 142. The clamping bolt 142 is connected between the first arm 130 and the second arm 140 along a third direction Z. The adjustment knob 141 is located on the side of the second arm 140 away from the first arm 130 along a third direction Z. The clamping bolt 142 passes through the second arm 140 along a third direction Z and is threadedly connected to the adjustment knob 141. Rotation adjustment can drive the first arm 130 to move towards or away from the second arm 140.

[0048] Optional, such as Figure 3 As shown, an elastic element 143 is also provided between the first arm 130 and the second arm 140. The elastic element 143 is sleeved on the clamping bolt 142 and is used to provide elastic force to the first arm 130 and the second arm 140 to move away from each other.

[0049] like Figure 8 and Figure 11 As shown, in some optional embodiments, the adjusting rod 221 passes through the adjusting support 224, and a rack 2211 is provided on the adjusting rod 221. The rack 2211 is located in the working cavity of the adjusting support 224. The adjusting component includes a first knob 2241 and a gear 2242. The gear 2242 is located in the working cavity and meshes with the rack 2211. The first knob 2241 extends from the outside of the adjusting support 224 into the working cavity and is connected to the gear 2242. The first knob 2241 and the gear 2242 are synchronously rotatable.

[0050] In these optional embodiments, the adjusting rod 221 passes through the adjusting support 224, which is sleeved on the outside of the adjusting rod 221. The adjusting support 224 can limit the movement direction of the adjusting rod 221 to the axial direction of the adjusting rod 221. The adjusting rod 221 passes through the adjusting support 224, and the rack 2211 is located in the working cavity of the adjusting support 224. The gear 2242 of the adjusting member meshes with the rack 2211, and the first knob 2241 extends from the adjusting support 224. The knob 2241 extends into the working chamber and connects to the gear 2242. Rotating the first knob 2241 drives the gear 2242 to rotate synchronously. Through the meshing transmission between the gear 2242 and the rack 2211, the rotational motion of the first knob 2241 is converted into the linear motion of the adjusting rod 221 along its own axis. This, in turn, drives the column 222, the swing clamp 223, and the guide assembly 210 to achieve position adjustment. After adjustment, the position of the adjusting rod 221 can be fixed by the locking member 2251 of the locking support 225. The operator can easily control the movement of the adjusting rod 221 by rotating the knob without complicated operation. The meshing transmission has good self-locking performance. Combined with the locking member 2251 of the locking support 225, the fixing reliability of the adjusting rod 221 is improved, reducing the displacement of the adjusting rod 221 due to vibration during drilling. This improves the adjustment accuracy and locking stability of the positioning mechanism 200, ensures the three-dimensional consistency of the bone defect experimental model, and improves the repeatability and standardization of the model.

[0051] Optional, such as Figure 7 , Figure 8 and Figure 10 As shown, the adjusting support 224 and the locking support 225 are arranged side by side along the first direction X. The adjusting rod 221 passes through the adjusting support 224 and the locking support 225 along the first direction X. The axis of the adjusting rod 221 is parallel to the first direction X. The axis of the column 222 is parallel to the third direction Z. The first clamping piece 2231 and the second clamping piece 2232 are arranged opposite to each other along the second direction Y. The first direction X, the second direction Y and the third direction Z intersect each other.

[0052] Optional, such as Figure 8 As shown, the adjusting support 224 has a receiving cavity, and the adjusting rod 221 passes through the receiving cavity of the adjusting support 224. A limiting block 2212 is provided at the end of the adjusting rod 221 away from the locking support 225. The diameter of the limiting block 2212 is larger than that of the receiving cavity, thereby reducing the risk of the adjusting rod 221 falling out of the receiving cavity.

[0053] like Figure 8As shown, in some optional embodiments, the locking support 225 includes two locking sub-seats 2252 disposed opposite to each other. The two locking sub-seats 2252 are respectively disposed on both sides of the adjusting rod 221 in the radial direction. The locking member 2251 is connected to the two locking sub-seats 2252. The locking member 2251 can be a bolt, which is connected to the two locking sub-seats 2252. Rotating the bolt causes the two locking sub-seats 2252 to move closer to each other and clamp the adjusting rod 221, thereby limiting the movement of the adjusting rod 221.

[0054] like Figure 1 and Figure 12 As shown, in some optional embodiments, the fixing mechanism 100 further includes a support column 150 and a support crossbar 160. The support crossbar 160 is connected to the support column 150 via a connecting seat 170. The connecting seat 170 is movably disposed relative to the support column 150, and the support crossbar 160 is movably disposed relative to the connecting seat 170. The second arm 140 is connected to the support crossbar 160.

[0055] In these optional embodiments, the support crossbar 160 is connected to the support column 150 via a connecting seat 170. The connecting seat 170 is movable relative to the support column 150, allowing adjustment of the vertical height of the support crossbar 160. The support crossbar 160 is also movable relative to the connecting seat 170, allowing adjustment of its lateral position. This enables vertical and lateral position adjustment of the first arm 130, the second arm 140, the first fixing plate 110, and the second fixing plate 120, adapting to the placement and fixation needs of animal limbs in different experimental scenarios. The movable cooperation between the connecting seat 170 and the support column 150 allows for flexible adjustment of the overall vertical height of the device, adapting to different operating table heights or animal limb placement height requirements. The movable cooperation between the support crossbar 160 and the connecting seat 170 allows for flexible adjustment of the lateral position, facilitating the adjustment of animal limbs to a suitable operating position. The bidirectional movable design enhances the spatial adjustment range and flexibility of the fixation mechanism 100, better adapting to the needs of experimental animals of different sizes and different surgical operating postures.

[0056] like Figure 12 and Figure 13As shown, in some optional embodiments, the connecting seat 170 has a first channel 171, a second channel 172 and a third channel 173. The first channel 171 and the second channel 172 penetrate the connecting seat 170 radially, and the third channel 173 penetrates the connecting seat 170 axially. The extending directions of the first channel 171 and the second channel 172 intersect. The support column 150 penetrates the first channel 171, and the support crossbar 160 penetrates the second channel 172. The third channel 173 includes a first opening 1731 and a second opening 1732 located at the two axially upward ends of the connecting seat 170, respectively. The first opening 1731 is located on the side of the first channel 171 away from the second channel 172, and the second opening 1732 is located on the side of the second channel 172 away from the first channel 171. The fixing mechanism 100 also includes a first locking part 180 and a second locking part 190. The first locking part 180 is located at the first opening 1731. The first locking part 180 is movably disposed in the direction of approaching or moving away from the support column 150 so that the support column 150 has a first locked state and a first free state. In the first locked state, the first locking part 180 abuts against the support column 150. In the first free state, the connecting seat 170 is movably disposed relative to the support column 150. The second locking part 190 is movably disposed in the direction of approaching or moving away from the support crossbar 160 so that the support crossbar 160 has a second locked state and a second free state. In the second locked state, the second locking part 190 abuts against the support crossbar 160. In the second free state, the support crossbar 160 is movably disposed relative to the connecting seat 170.

[0057] In these optional embodiments, the connecting seat 170 has a first channel 171 and a second channel 172, which extend radially through the connecting seat 170. The support column 150 extends through the first channel 171, and the support crossbar 160 extends through the second channel 172. The extension direction of the first channel 171 is the direction of movement of the support column 150 relative to the connecting seat 170, and the extension direction of the second channel 172 is the direction of movement of the support crossbar 160 relative to the connecting seat 170. The third channel 173 extends axially through the connecting seat 170 and is connected to the first channel 171 and the second channel 172. The first opening 1731 is used to house the first locking part 180, and the second opening 1732 is used to house the second locking part 190. The first locking part 180 extends into the third channel 173 through the first opening 1731. The first locking part 180 is movable in the direction approaching or away from the support column 150, so that the support column 150 has a first locked state and a first free state. In the first locked state, the first locking part 180 abuts against the support column 150. In the first free state, the connecting seat 170 is movable relative to the support column 150. The second locking part 190 is movable in the direction approaching or away from the support crossbar 160, so that the support crossbar 160 has a second locked state and a second free state. In the second locked state, the second locking part 190 abuts against the support crossbar 160. In the second free state, the support crossbar 160 is movable relative to the connecting seat 170. The first locking part 180 fixes the connecting seat 170 in the vertical position of the supporting column 150, and the second locking part 190 fixes the horizontal position of the supporting crossbar 160. When locked, a reliable fixation is formed by abutment. In the free state, the relative position of the connecting seat 170 with the supporting column 150 and the supporting crossbar 160 can be flexibly adjusted.

[0058] like Figure 13 As shown, in some optional embodiments, the first locking part 180 includes a first locking knob 181 and a first locking ring. The first locking ring is located in the first channel 171 and sleeved on the support column 150. The first locking ring is threadedly connected to the first locking knob 181 through the first opening 1731. And / or, the second locking part 190 includes a second locking knob 191 and a second locking ring 192. The second locking ring 192 is located in the second channel 172 and sleeved on the support crossbar 160. The second locking ring 192 is threadedly connected to the second locking knob 191 through the second opening 1732.

[0059] In these optional embodiments, the first locking ring is located in the first channel 171 and sleeved on the support column 150. The first locking knob 181 is threadedly connected to the first locking ring through the first opening 1731. The diameter of the first locking knob 181 is larger than the diameter of the first opening 1731. When the first locking knob 181 is rotated in the forward direction, the first locking ring can be driven to move in the direction close to the first locking knob 181. Part of the inner wall of the first locking ring is tightly attached to the outer peripheral surface of the support column 150, thereby locking the support column 150 and the connecting seat 170. When rotated in the reverse direction, the first locking ring releases the constraint on the support column 150. The second locking ring 192 of the second locking part 190 is located in the second channel 172 and sleeved on the support crossbar 160. The second locking knob 191 is threadedly connected to the second locking ring 192 through the second opening 1732. The diameter of the second locking knob 191 is larger than the diameter of the second opening 1732. When the second locking knob 191 is rotated in the forward direction, it can drive the second locking ring 192 to move in the direction close to the second locking knob 191, so that the inner wall of the second locking ring 192 is tightly attached to the outer circumference of the support crossbar 160, thereby locking the support crossbar 160 and the connecting seat 170. When rotated in the reverse direction, the second locking ring 192 is reset, releasing the constraint on the support crossbar 160. The sleeved design of the first locking ring and the support column 150 increases the contact area between the first locking ring and the support column 150, resulting in a tighter fit when locked, stronger anti-displacement capability, and ensuring that the vertical position of the connecting seat 170 is stable and reliable after locking. The sleeved design of the second locking ring 192 and the support crossbar 160 increases the contact area between them, resulting in a tighter fit during locking and stronger anti-displacement capability, ensuring the stable and reliable lateral position of the support crossbar 160 after locking. The threaded connection locking method is convenient to operate; locking and unlocking can be completed simply by rotating the locking knob, without the need for complex tools, and the locking force can be flexibly adjusted according to requirements.

[0060] Optionally, the inner wall of the first locking ring facing the support column 150 is provided with anti-slip texture to increase the friction between the first locking ring and the support column 150 when locked, and the inner wall of the second locking ring 192 facing the support crossbar 160 is provided with anti-slip texture to increase the friction between the second locking ring 192 and the support crossbar 160 when locked.

[0061] like Figure 14 and Figure 15 As shown, the second aspect of this application discloses a bone defect modeling system, including the bone defect modeling device in any of the embodiments of the first aspect. The bone defect modeling system includes a drilling tool 300, which includes a drill bit 310 and a limiting ring 320. The limiting ring 320 is sleeved on the outside of the drill bit 310. The drill bit 310 is used to penetrate the guide channel 2121 and the operation window 111. The limiting ring 320 abuts against the end of the guide component 210 away from the first fixing plate 110 to limit the drilling depth of the drill bit 310.

[0062] In these optional embodiments, a limiting ring 320 is fitted onto the outside of the drill bit 310. The position of the limiting ring 320 on the drill bit 310 can be adjusted and fixed according to the preset drilling depth. During drilling, the drill bit 310 sequentially passes through the guide channel 2121 of the guide component 210 and the operation window 111 of the first fixing plate 110 to drill the target bone tissue. When the drilling reaches the preset depth, the limiting ring 320 abuts against the end of the guide component 210 away from the first fixing plate 110, forming a physical barrier to limit the further advancement of the drill bit 310, thereby locking the drilling depth. The adjustable design of the limiting ring 320 allows the device to flexibly adapt to bone defect models with different depth requirements. The abutment between the limiting ring 320 and the guide component 210 reduces the dependence on the operator's experience, reduces the problem of drilling too deep and damaging the medullary cavity or drilling too shallow and failing to meet the standard, improves the consistency of bone defect depth among all experimental individuals, reduces experimental errors caused by depth deviation, and enhances the comparability and reliability of data between different experimental groups. The limiting ring 320 has a screw hole, and the locking screw 321 is screwed into the screw hole. The end of the locking screw 321 abuts against the drill bit 310 to fix the position of the limiting ring 320 on the drill bit 310.

[0063] Optional, such as Figure 16 As shown, the bone defect modeling system also includes a centering tube 400, which is inserted into the guide channel 2121. The tube wall of the centering tube 400 is marked with graduations, which can intuitively reflect the length parameters. Before drilling, the centering tube 400 is inserted into the guide channel 2121, with one end of the centering tube 400 abutting against the target bone surface. By reading the graduation value of the guide sleeve 212 on the side opposite to the first fixation plate 110, the operator can accurately obtain the distance from the guide sleeve 212 on the side opposite to the first fixation plate 110 to the target bone surface. This provides a precise numerical basis for adjusting the position of the limiting ring 320, making the position adjustment of the limiting ring 320 more accurate, thereby ensuring the consistency of drilling depth. This effectively reduces the problem of drilling too deep and damaging the medullary cavity or drilling too shallow and failing to meet the modeling standards, improves the depth accuracy of the bone defect model, reduces the dependence on the operator's experience, and enhances the repeatability and standardization of experimental modeling.

[0064] Optional, such as Figure 16 As shown, the centering tube 400 is equipped with a spherical lens 410, with a crosshair at its center. The spherical lens 410 magnifies the field of view, clearly presenting the details of the target bone surface. The crosshair at its center serves as a visual alignment reference. When the centering tube 400 passes through the guide channel 2121 and abuts against the target bone surface, the spherical lens 410 is located at the end of the centering tube 400 facing the second fixing plate 120. The operator can observe through the spherical lens 410 and accurately align the crosshair with the drilling mark on the bone surface, thereby improving alignment accuracy and aligning the guide channel 2121 with the drilling mark to ensure the accuracy of the drilling position.

[0065] Optionally, the centering tube 400 has a cylindrical structure with a cavity inside, and the spherical lens 410 is disposed at one end of the centering tube 400 in the extending direction.

[0066] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A bone defect modeling device, characterized in that, include: The fixing mechanism includes a first fixing plate and a second fixing plate arranged opposite to each other. The first fixing plate and the second fixing plate are movable along the direction of approaching and moving away from each other. An operation window is provided on the first fixing plate. The positioning mechanism includes a guide component and an adjustment component. The guide component is located on the side of the first fixed plate opposite to the second fixed plate. The guide component is movably connected to the adjustment component. The adjustment component is used to adjust and lock the position of the guide component. The guide component has a guide channel located on the side of the operation window opposite to the second fixed plate. The guide channel and the operation window are used for passing a drilling tool. The guide channel is used to limit the drilling depth and drilling angle of the drilling tool.

2. The bone defect modeling device according to claim 1, characterized in that, The adjustment assembly includes an adjustment rod, a column, and a swing clamp. The adjustment rod is movably disposed along its axial direction. The column is connected to the end of the adjustment rod facing the first fixed plate, and the axial direction of the column intersects with the axial direction of the adjustment rod. The swing clamp is rotatably connected to the column and is swayable about the axial direction of the column. The guide assembly is connected to the side of the swing clamp away from the column.

3. The bone defect modeling device according to claim 2, characterized in that, The guide assembly includes a mounting cylinder and a guide sleeve. The guide sleeve is detachably disposed on the mounting cylinder. The guide sleeve has a guide channel. A ball head is disposed on the outer side of the mounting cylinder. The mounting cylinder is rotatably connected to the swing clamping member through the ball head.

4. The bone defect modeling device according to claim 3, characterized in that, The swing clamping member includes a first clamping plate and a second clamping plate arranged opposite to each other. Both the first clamping plate and the second clamping plate include an arc-shaped segment and a straight segment. The arc-shaped segment of the first clamping plate and the second clamping plate surrounds both sides of the column in the radial direction. An adjustment hole is provided on the straight segment. The ball head is located between the first clamping plate and the second clamping plate, and part of the ball head extends into the adjustment hole of the first clamping plate and the second clamping plate.

5. The bone defect modeling device according to claim 4, characterized in that, A locking bolt is also provided on the straight section. The locking bolt is located between the adjustment hole and the arc-shaped section. The locking bolt is used to lock the first clamping piece and the second clamping piece.

6. The bone defect modeling device according to claim 2, characterized in that, The fixing mechanism includes a first arm and a second arm, which are hinged together. The end of the first arm is connected to the first fixing plate, and the end of the second arm is connected to the second fixing plate. The adjusting assembly further includes an adjusting support and a locking support. The adjusting rod is connected to the first arm through the adjusting support and the locking support. The adjusting support is provided with an adjusting element for adjusting the position of the adjusting rod, and the locking support is provided with a locking element for locking the adjusting rod.

7. The bone defect modeling device according to claim 6, characterized in that, The adjusting rod passes through the adjusting support, and a rack is provided on the adjusting rod. The rack is located in the working cavity of the adjusting support. The adjusting component includes a first knob and a gear. The gear is located in the working cavity and meshes with the rack. The first knob extends from the outside of the adjusting support into the working cavity and is connected to the gear. The first knob and the gear are synchronously rotatable.

8. The bone defect modeling device according to claim 6, characterized in that, The fixing mechanism further includes a support column and a support crossbar. The support crossbar is connected to the support column via a connecting seat. The connecting seat is movably disposed relative to the support column. The support crossbar is movably disposed relative to the connecting seat. The second arm is connected to the support crossbar.

9. The bone defect modeling device according to claim 8, characterized in that, The connecting seat has a first channel, a second channel, and a third channel. The first channel and the second channel penetrate the connecting seat radially, and the third channel penetrates the connecting seat axially. The extension directions of the first channel and the second channel intersect. The supporting column penetrates the first channel, and the supporting crossbar penetrates the second channel. The third channel includes a first opening and a second opening located at the two ends of the axial direction of the connecting seat, respectively. The first opening is located on the side of the first channel away from the second channel, and the second opening is located on the side of the second channel away from the first channel. The fixing mechanism further includes a first locking part and a second locking part. The first locking part is located at the first opening. The first locking part is movably configured along the direction of approaching or moving away from the support column so that the support column has a first locked state and a first free state. In the first locked state, the first locking part abuts against the support column. In the first free state, the connecting seat is movably configured relative to the support column. The second locking part is movably configured along the direction of approaching or moving away from the support crossbar so that the support crossbar has a second locked state and a second free state. In the second locked state, the second locking part abuts against the support crossbar. In the second free state, the support crossbar is movably configured relative to the connecting seat.

10. The bone defect modeling device according to claim 9, characterized in that, The first locking part includes a first locking knob and a first locking ring. The first locking ring is located in the first channel and sleeved on the outside of the support column. The first locking ring is threadedly connected to the first locking knob through the first opening. And / or, the second locking part includes a second locking knob and a second locking ring. The second locking ring is located in the second channel and sleeved on the outside of the support crossbar. The second locking ring is threadedly connected to the second locking knob through the second opening.

11. A bone defect modeling system, characterized in that, The bone defect modeling device includes any one of claims 1-10, wherein the bone defect modeling system includes a drilling tool, the drilling tool includes a drill bit and a limiting ring, the limiting ring is sleeved on the outside of the drill bit, the drill bit is used to penetrate the guide channel and the operating window, and the limiting ring abuts against the end of the guide assembly opposite to the first fixing plate to limit the drilling depth of the drill bit.

12. The bone defect modeling system according to claim 11, characterized in that, The bone defect modeling device also includes a centering tube, which is used to pass through the guide channel. The wall of the centering tube is provided with graduations, and one end of the centering tube is provided with a spherical lens.

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