Auxiliary fixator and osteochondral defect model construction device

Abstract

The utility model belongs to the field of instruments for animal model construction, and particularly relates to an auxiliary fixator and an osteochondral defect model construction device, the auxiliary fixator comprises a fixing head and a holding part arranged on the fixing head, the fixing head comprises a middle main body, an elastic clamping piece, an arc-shaped pressing piece and a clamping hook, the middle main body is provided with a guide hole for a drill bit to stretch in, and the clamping hook is arranged on the middle main body. The number of the elastic clamping pieces is two, the two elastic clamping pieces are arranged on the two opposite sides of the middle body and used for clamping the bone condyle, the arc-shaped pressing piece and the clamping hook are arranged on the other two opposite sides of the middle body, the arc-shaped pressing piece is used for being pressed on the bone condyle, and the clamping hook is bent towards the position between the two elastic clamping pieces. The arc-shaped pressing piece is used for being clamped in a bone condyle area away from the arc-shaped pressing According to the utility model, the bone condyle part to be drilled can be fixed in a multi-point manner, the drilling accuracy is improved under the condition of reducing the drilling control difficulty, and the consistency and success rate of constructing a cartilage defect model by using a drilling method are improved.

Description

Technical Field

[0001] This utility model belongs to the field of instruments for constructing animal models, specifically relating to an auxiliary fixator and a device for constructing osteochondral defect models. Background Technology

[0002] Animal models are primarily used in experimental physiology, experimental pathology, and experimental therapeutics research. Among these, cartilage defect models are a key technique for studying osteoarthritis, cartilage damage, and repair. The drilling method is commonly used to construct cartilage defect models. This method involves using an electric bone drill to create holes of a specific diameter and depth in the cartilage tissue at the distal condyle of the bone, thus creating a lesion with corresponding characteristics. However, because the condyle of the bone has an irregular shape and a curved surface, directly drilling with an electric bone drill requires a high level of skill from the operator. Furthermore, controlling the precision and stability of the drilling is challenging, easily leading to unnecessary excessive damage, affecting the consistency and success rate of model establishment, and consequently impacting the accuracy of research results. Utility Model Content

[0003] This invention provides an auxiliary fixation device and a construction device for osteochondral defect models, aiming to solve the problems of high accuracy and stability control of drilling when constructing cartilage defect models by drilling, which can easily cause unnecessary excessive damage and affect the consistency and success rate of model establishment.

[0004] This utility model provides an auxiliary fixation device, including a fixing head and a gripping part disposed on the fixing head. The fixing head includes a central body, elastic clips, an arc-shaped pressure plate, and a hook. The central body has a guide hole for a drill bit to enter, and the guide hole passes through the central body to face the bone condyle. There are two elastic clips, which are disposed on two opposite sides of the central body for clamping the bone condyle. The arc-shaped pressure plate and the hook are disposed on the other opposite sides of the central body. The arc-shaped pressure plate is used to press on the bone condyle, and the hook bends towards the space between the two elastic clips to lock onto the area of ​​the bone condyle away from the arc-shaped pressure plate.

[0005] Furthermore, the two elastic clips have a friction-enhancing structure on one side for holding the bone condyle.

[0006] Furthermore, one end of each of the two elastic clips used to hold the bone condyle is provided with a sloping guide structure.

[0007] Furthermore, the side of the central body facing the bone condyle is an arc surface.

[0008] Furthermore, the central body has a chip removal groove on the side facing the bone condyle, one end of which is connected to the edge of the guide hole, and the other end extends toward the edge of the central body.

[0009] Furthermore, the two elastic clips are integrally formed with the arc-shaped pressure plate and the hook, and are arranged in a cross pattern. The intersection area of ​​the two elastic clips with the arc-shaped pressure plate and the hook forms the central main body.

[0010] Furthermore, the gripping portion is inclined relative to the axis of the guide hole.

[0011] The present invention also provides a device for constructing a model of osteochondral defects, including the auxiliary fixator as described above, and a drill bit for an electric bone drill. The drill bit has at least two spiral grooves on its side, and a limiting block is provided on the side of the drill bit in the area between two adjacent spiral grooves. The limiting block is used to abut against the area on the central body located at the edge of the guide hole opening to limit the drilling depth of the drill bit.

[0012] Furthermore, the end of the drill bit that contacts the bone condyle during drilling is the cutting head of the drill bit, and the end of the drill bit opposite to the cutting head is provided with an extension rod.

[0013] Furthermore, the cutting head is conical.

[0014] The beneficial effects of this invention are that the central main body, two elastic clips, arc-shaped pressure plate, and hook together form a space that encloses and fixes the bone condyle to be drilled, achieving multi-point fixation of the bone condyle to be drilled. Compared with the conventional method of fixation by clamping from both sides, this invention provides a more secure and stable fixation. Furthermore, the drilling action of the drill bit is guided by the guide hole, avoiding problems such as slippage and swaying deviation that occur when the drill bit rotates at high speed to enter the hole. This improves the accuracy and stability of drilling while reducing the difficulty of drilling control, and reduces unnecessary damage. Therefore, it can reduce the skill requirements of the operator and improve the consistency and success rate of constructing cartilage defect models using the drilling method, ensuring the accuracy of research results. Attached Figure Description

[0015] Figure 1 This is a first-view structural diagram of the auxiliary fixation device of this utility model.

[0016] Figure 2 This is a second-view structural diagram of the auxiliary fixation device of this utility model.

[0017] Figure 3 This is a schematic diagram of the drill bit of this utility model.

[0018] Figure 4 This is a schematic diagram of the cooperation structure between the auxiliary fixing device and the drill bit of this utility model.

[0019] In the diagram: 1. Fixed head; 11. Central body; 111. Guide hole; 112. Chip removal groove; 12. Elastic clamping plate; 121. Friction-enhancing structure; 122. Inclined guide sliding structure; 13. Arc-shaped pressure plate; 14. Hook; 2. Holding part; 21. Connecting rod; 22. Handle; 3. Drill bit; 31. Spiral groove; 32. Limiting block; 33. Cutting head; 34. Extension rod. Detailed Implementation

[0020] like Figures 1-4 As shown, this utility model provides an auxiliary fixation device, including a fixing head 1 and a gripping part 2 disposed on the fixing head 1. The fixing head 1 includes a central body 11, elastic clips 12, an arc-shaped pressure plate 13, and a hook 14. The central body 11 is provided with a guide hole 111 for a drill bit 3 to enter. The guide hole 111 passes through the central body 11 and faces the side of the bone condyle, which specifically refers to the protrusion at the end of the bone. There are two elastic clips 12, which are disposed on opposite sides of the central body 11 for clamping the bone condyle. The elastic clips 12 specifically refer to sheet-like bodies that can generate a certain rigidity and elasticity under force, such as stainless steel sheets or other metal sheets. In use, the two elastic clips 12 are slightly spread apart by the force of the bone condyle, and at the same time, the bone condyle is clamped under the elastic force of the two elastic clips 12. The arc-shaped pressure plate 13 and the hook 14 are located on opposite sides of the central body 11. The central body 11 is situated between the two elastic clips 12 and the arc-shaped pressure plate 13 and hook 14. The arc-shaped pressure plate 13 is used to press against the bone condyle. Compared to a planar structure, the arc-shaped structure has a better fit to the surface shape of the bone condyle, resulting in higher stability when pressed against the bone condyle surface. The hook 14 bends towards the two elastic clips 12 and is used to lock onto the area of ​​the bone condyle away from the arc-shaped pressure plate 13.

[0021] In use, the two elastic clips 12 clamp the side of the bone condyle, and the arc-shaped pressure plate 13 presses on the area above the bone condyle between the two elastic clips 12. By moving the auxiliary fixator as a whole through the gripping part 2, the hook 14 is locked at a certain point in the area of ​​the bone condyle away from the arc-shaped pressure plate 13, thus fixing the bone condyle to be drilled. In this invention, the central body 11, the two elastic clips 12, the arc-shaped pressure plate 13, and the hook 14 together form a space that encloses and fixes the bone condyle to be drilled, achieving multi-point fixation of the bone condyle to be drilled. Compared with the conventional method of clamping and fixing from both sides, this invention provides a more secure and stable fixation. Furthermore, the drilling action of the drill bit 3 is guided by the guide hole 111, avoiding slippage, swaying, and deviation problems that occur when the drill bit 3 rotates at high speed to drill. This reduces the difficulty of drilling control, improves the accuracy and stability of drilling, and reduces unnecessary damage. Therefore, it can reduce the skill requirements of the operator and improve the consistency and success rate of constructing cartilage defect models using the drilling method, ensuring the accuracy of research results.

[0022] The two elastic clips 12 have a friction-enhancing structure 121 on one side for clamping the bone condyle, which increases the friction force of the elastic clips 12 clamping the bone condyle and further improves the stability of the clamping. In one embodiment of this utility model, the friction-enhancing structure 121 is a plurality of spaced strip-shaped protrusions, for example... Figure 1 , 2 As shown in Figure 4, the cross-sectional shape of the strip-shaped protrusion can be determined according to actual design requirements, such as a triangle, a polygon, or a semicircle. In other embodiments of this utility model, the friction-enhancing structure 121 consists of a plurality of spaced dot-shaped protrusions.

[0023] The two elastic clips 12 have a sloping guide structure 122 at one end of their respective ends for clamping the bone condyle. This structure facilitates the insertion of the two elastic clips 12 along the side of the bone condyle, improving the ease of clamping the bone condyle. Specifically, the sloping guide structure 122 can be a platform-like structure with an inclined orientation, for example… Figure 2 The structure is shown. In other embodiments, the inclined guide structure 122 can be directly formed by providing a chamfer at the end of one end of the two elastic clips 12 used to hold the bone condyle.

[0024] The central body 11 has an arc-shaped surface on the side facing the bone condyle, which better matches the shape of the bone condyle surface. After fixing the bone condyle, the central body 11 can press more firmly against the bone condyle surface, further improving the stability of the fixation. In one embodiment of this utility model, the central body 11 is only arc-shaped on the side facing the bone condyle. In another embodiment of this utility model, the central body 11 is arc-shaped as a whole. The two embodiments can be determined according to actual needs.

[0025] The central body 11 has a chip removal groove 112 on the side facing the bone condyle. One end of the chip removal groove 112 communicates with the edge of the guide hole 111, and the other end extends towards the edge of the central body 11. This arrangement facilitates the removal of bone chips generated during drilling by the drill bit 3. The number of chip removal grooves 112 can be set according to actual needs, for example, one or more.

[0026] In one embodiment of this utility model, two elastic clips 12, an arc-shaped pressure plate 13, and a hook 14 are fixed on the central body 11 by screws or other fasteners. In a preferred embodiment of this utility model, the two elastic clips 12, the arc-shaped pressure plate 13, and the hook 14 are integrally formed, and are arranged in a cross shape. The intersection area of ​​the two elastic clips 12 and the arc-shaped pressure plate 13 and the hook 14 forms the central body 11, that is, the central body 11, the two elastic clips 12, and the arc-shaped pressure plate 13 and the hook 14 are an integral structure.

[0027] The grip 2 is inclined relative to the axis of the guide hole 111. Specifically, the grip 2 includes a connecting rod 21 and a handle 22. One end of the connecting rod 21 is fixed to the fixing head 1, and the connecting rod 21 is inclined relative to the axis of the guide hole 111. The handle 22 is located at the other end of the connecting rod 21. This arrangement allows sufficient clearance for the drill bit 3 in situations with limited space, while keeping the handle 22 as far away from the drill bit 3 as possible to avoid interference and ensure the safety of the operator when holding the grip 2. The handle 22 has a flat structure, which facilitates better downward fixation via the connecting rod 21. When the hook 14 abuts against a certain position on the bone condyle, pressing down the handle 22 can fix the modeling position, thereby smoothly and reliably completing the subsequent drilling work.

[0028] This utility model also provides a device for constructing an osteochondral defect model, wherein osteochondral refers to the cartilage tissue at the end of a bone. The device includes the aforementioned auxiliary fixator and a drill bit 3 for an electric bone drill. The drill bit 3 has at least two spiral grooves 31 on its side, i.e., the drill bit 3 is a twist drill. A limiting block 32 is provided on the side of the drill bit 3 in the area between two adjacent spiral grooves 31. The limiting block 32 abuts against the area on the central body 11 located at the edge of the guide hole 111, thereby limiting the drilling depth of the drill bit 3. Since the limiting block 32 is located in the area between two adjacent spiral grooves, it limits the drilling depth of the drill bit 3 without affecting the normal discharge of bone fragments during drilling, thus ensuring the reliability of the drilling operation.

[0029] This invention provides a device for constructing a cartilage defect model, which can achieve multi-point fixation of the bone condyle to be drilled, resulting in more secure fixation and higher stability. Furthermore, the drilling action of the drill bit 3 is guided by the guide hole 111, avoiding slippage, swaying, and deviation problems that occur when the drill bit 3 rotates at high speed to drill. This reduces the difficulty of drilling control while improving the accuracy and stability of drilling control, minimizing unnecessary damage, reducing the skill requirements for the operator, ensuring the reliability of constructing a cartilage defect model using the drilling method, improving the consistency and success rate of the constructed model, and guaranteeing the accuracy of research results.

[0030] In this embodiment, when the central body 11 is arc-shaped, the side facing away from the bone condyle is also arc-shaped. Therefore, a limiting ring platform with a flat top can be provided on the side of the central body 11 facing away from the bone condyle to better contact with the limiting block 32 and improve the reliability of the drilling depth control of the drill bit 3.

[0031] When drilling, the end of the drill bit 3 that contacts the bone condyle is the cutting head 33. The end of the drill bit 3 away from the cutting head 33 is provided with an extension rod 34. Based on this setting, when the drill bit 3 is used on an electric bone drill, the distance between the cutting head 33 and the main body of the electric bone drill is greater, which can prevent the operator's view from being blocked by the main body of the electric bone drill when drilling, and allow the operator to observe the drilling position more directly when drilling.

[0032] The cutting head 33 is tapered, which facilitates rapid drilling and smoother hole drilling when the drill bit 3 contacts bone tissue.

[0033] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of protection of this application is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0034] One or more embodiments in this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this application should be included within the protection scope of this application.

Claims

1. An auxiliary fixation device, characterized in that, The device includes a fixing head (1) and a gripping part (2) disposed on the fixing head (1). The fixing head (1) includes a central body (11), elastic clips (12), an arc-shaped pressure plate (13), and a hook (14). The central body (11) is provided with a guide hole (111) for the drill bit (3) to be inserted. The guide hole (111) passes through the central body (11) and is used to face the bone condyle. There are two elastic clips (12). The two elastic clips (12) are disposed on one of the opposite sides of the central body (11) for clamping the bone condyle. The arc-shaped pressure plate (13) and the hook (14) are disposed on the other opposite sides of the central body (11). The arc-shaped pressure plate (13) is used to press on the bone condyle. The hook (14) bends towards the two elastic clips (12) and is used to lock the area of ​​the bone condyle away from the arc-shaped pressure plate (13).

2. The auxiliary fixation device as described in claim 1, characterized in that, The two elastic clips (12) are provided with a friction-enhancing structure (121) on one side for clamping the bone condyle.

3. The auxiliary fixation device as described in claim 2, characterized in that, The two elastic clips (12) are provided with a sloping guide structure (122) at one end of their respective ends for holding the bone condyle.

4. The auxiliary fixation device as described in any one of claims 1-3, characterized in that, The central body (11) has an arc-shaped surface facing the bone condyle.

5. The auxiliary fixation device as described in claim 4, characterized in that, The central body (11) is provided with a chip removal groove (112) on the side facing the bone condyle. One end of the chip removal groove (112) is connected to the edge of the guide hole (111), and the other end extends toward the edge of the central body (11).

6. The auxiliary fixation device as described in any one of claims 1-3 and 5, characterized in that, The two elastic clips (12) are integrally formed with the arc-shaped pressure plate (13) and the hook (14) and are arranged in a cross shape. The intersection area of ​​the two elastic clips (12) with the arc-shaped pressure plate (13) and the hook (14) forms the central body (11).

7. The auxiliary fixation device as described in any one of claims 1-3 and 5, characterized in that, The gripping part (2) is inclined relative to the axis of the guide hole (111).

8. A device for constructing a model of osteochondral defects, characterized in that, The device includes the auxiliary fixation device as described in any one of claims 1-7, and also includes a drill bit (3) for an electric bone drill, wherein the drill bit (3) has at least two spiral grooves (31) on its side, and a limiting block (32) is provided on the side of the drill bit (3) in the area between two adjacent spiral grooves (31), the limiting block (32) being used to abut against the area on the central body (11) located at the edge of the guide hole (111) to limit the drilling depth of the drill bit (3).

9. The osteochondral defect model construction device as described in claim 8, characterized in that, When drilling, the end of the drill bit (3) that contacts the bone condyle is the cutting head (33) of the drill bit (3), and the end of the drill bit (3) away from the cutting head (33) is provided with an extension rod (34).

10. The osteochondral defect model construction device as described in claim 9, characterized in that, The cutter head (33) is conical.

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