Driver and prosthesis for biotype trochlear groove replacement

Abstract

This utility model relates to medical devices, specifically to an inserter and prosthesis for a biological trochlear groove replacement. The trochlear groove prosthesis includes a block-shaped prosthesis. The upper surface of the prosthesis is a continuous curved surface that is higher in the middle and lower at both ends along its length. A convex edge is arranged along the length of the prosthesis, and the upper edge of the convex edge is an arc shape that is higher in the middle and lower at both ends along the length of the prosthesis. The rate of curvature change of the upper edge of the convex edge is different from the rate of curvature change of the bottom surface of the trochlear groove. The lower end face of the block-shaped indenter on the inserter is provided with an arc-shaped convex surface, which forms a surface contact with the inner surface of the trochlear groove formed by the upper surface of the prosthesis. As a force-transmitting component that directly contacts the prosthesis, the indenter can avoid the existence of point contact, which can lead to excessive local stress and damage to the prosthesis. At the same time, it can effectively reduce the possibility of slippage between the indenter and the prosthesis.

Description

Technical Field

[0001] This utility model relates to medical devices, specifically to a biological trochlear groove replacement implant and prosthesis. Background Technology

[0002] When a pet dog or cat suffers patellar dislocation due to trochlear injury or developmental malformation, patellar trochlear replacement surgery can be performed. This requires removing the damaged trochlear groove on the femur and then implanting a replacement prosthesis.

[0003] The patent document entitled "Bio-type Trochlear Groove Replacement Component and its Usage Method" (Publication No. CN118924506A) is the applicant's earlier application. Its disclosed technical solution includes a prosthesis, a trial mold, and a pad. The upper surface of the prosthesis is a continuous curved surface forming the trochlear groove, and the lower surface of the prosthesis is entirely flat. The lower surface of the prosthesis has a centrally located first mounting post and a second mounting post arranged along the outer periphery of the prosthesis. The shafts of the first and second mounting posts extend from the lower surface of the prosthesis away from the upper surface. The trial mold and the pad have first and second positioning holes for drilling mounting holes, thus providing accurate positioning for the installation of the pad and the prosthesis, ensuring the matching degree between the positions of the first and second mounting holes on the femoral section and the prosthesis mounting posts.

[0004] like Figure 1 As shown, the upper surface of prosthesis A is a continuous curved surface with a high center and low ends along its length. Simultaneously, the two edges of the upper surface of prosthesis A bulge upwards along its width to form raised edges A2. The opposite sides of the two raised edges A2, together with the upper surface of prosthesis A, form a trochlear groove A1. In this technical solution, when connecting prosthesis A to the femur, the mounting post on the lower surface of prosthesis A needs to be pressed into the corresponding mounting hole on the femoral cross-section. The diameter of the mounting hole needs to be slightly smaller than the diameter of the mounting post; otherwise, prosthesis A may easily become loose. Currently, the process of inserting the mounting post into the mounting hole requires overcoming significant resistance. Existing technologies generally use tools such as hammers. When installing prosthesis A onto the femur, an external force along the core direction of the mounting post needs to be applied to prosthesis A. Due to the non-planar curved surface of prosthesis A, the contact between the hammer and the curved surface of prosthesis A is almost point contact, resulting in extremely high local stress on prosthesis A, which can easily cause deformation and damage. Moreover, the direction of the applied external force is difficult to control accurately. The curved surface at the point where the external force acts on the prosthesis A usually forms an angle with the direction of the force, which makes it easy for tools such as hammers to slip relative to the prosthesis A, affecting the smooth installation of the prosthesis A. Summary of the Invention

[0005] This invention provides a bio-type trochlear groove replacement inserter and prosthesis. The indenter on the inserter and the trochlear groove of the prosthesis form a surface contact fit. By using the indenter as a force transmission component, the problem of excessive local stress and deformation damage to the prosthesis caused by only point contact with the indenter is avoided. At the same time, the indenter and the prosthesis will not easily slip.

[0006] To achieve the above objectives, the technical solution adopted is as follows: a biological trochlear groove replacement inserter, wherein the lower end face of the block-shaped indenter is provided with an arc-shaped convex surface, which is a curved surface that forms a surface contact with the inner surface of the trochlear groove formed on the upper surface of the prosthesis.

[0007] A bio-type trochlear groove replacement prosthesis includes a block-shaped prosthesis. The upper surface of the prosthesis is a continuous curved surface with a high center and low ends along its length. The two edges of the upper surface of the prosthesis extend upward to form convex edges along its width. The convex edges are arranged along the length of the prosthesis, and the upper edge of the convex edges is an arc shape with a high center and low ends along the length of the prosthesis. The opposite sides of the two convex edges and the upper surface of the prosthesis enclose a trochlear groove. The lower surface of the prosthesis is provided with a downwardly protruding mounting post. The rate of curvature change of the upper edge of the convex edges is different from the rate of curvature change of the bottom surface of the trochlear groove.

[0008] Compared with existing technologies, the technical advantages of this invention are as follows: the arc-shaped convex surface of the indenter and the inner surface of the trochlear groove on the prosthesis form a surface contact fit. As a force-transmitting component that directly contacts the prosthesis, the indenter avoids point contact, which could lead to excessive local stress and damage to the prosthesis, thus ensuring the integrity of the prosthesis after installation. Simultaneously, the arc-shaped convex surface and the trochlear groove formed on the upper surface of the prosthesis create a concave-convex embedded fit, mutually limiting each other and effectively reducing the possibility of slippage between the indenter and the prosthesis, ensuring relative stability and facilitating smooth prosthesis installation. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the prosthesis;

[0010] Figure 2 This is a three-dimensional appearance schematic diagram of the present utility model;

[0011] Figure 3 This is the front view of the present invention;

[0012] Figure 4 This is a 3D schematic diagram of the pressure head.

[0013] Figure 5 This is the main view of the pressure head;

[0014] Figure 6 A schematic diagram of an arc-shaped convex surface and an arc-shaped stepped surface;

[0015] Figure 7 A schematic diagram showing the fit between the indenter and the trochlear groove on the prosthesis;

[0016] Figure 8 Front view of the engagement state between the indenter and the trochlear groove on the prosthesis;

[0017] Figure 9 This is a schematic diagram showing the state in which the curved convex surface of the pressure head fits against the bottom of the trolley groove;

[0018] Figure 10 This is a schematic diagram of the cross-section of the prosthesis. Detailed Implementation

[0019] The following is in conjunction with the appendix Figure 1-10 The present invention will be further described in detail below, including related content:

[0020] Example 1

[0021] A bio-type trochlear groove replacement inserter has an arc-shaped convex surface 11 on the lower end face of a block-shaped indenter 10. The arc-shaped convex surface 11 is a curved surface that forms a surface contact with the inner surface of the trochlear groove A1 formed by the upper surface of the prosthesis A. The inner surface of the trochlear groove A1 refers not only to the bottom surface of the trochlear groove A1, but also includes the groove wall surface.

[0022] In the above technical solution, after aligning the mounting post on the prosthesis A with the positioning hole on the femur, the mounting post is inserted into the positioning hole along the core direction. The pressure head 10, as the force-transmitting component in direct contact with the prosthesis A, has a surface-contact fit between its arc-shaped convex surface 11 and the inner surface of the trochlear groove A1 on the prosthesis A. When applying pressure indirectly to the prosthesis A through the pressure head 10, point contact between the pressure head 10 and the prosthesis A is avoided, preventing excessive local stress and damage to the prosthesis A, thus ensuring the integrity of the contact area between the prosthesis A and the pressure head 10. Simultaneously, the arc-shaped convex surface 11 and the trochlear groove A1 formed on the upper surface of the prosthesis A form a concave-convex embedded fit, mutually limiting each other and effectively reducing the possibility of slippage between the pressure head 10 and the prosthesis A.

[0023] Here, tools such as hammers can be used to strike the pressure head 10 to encourage the mounting post on the prosthesis A to be inserted into the positioning hole on the femur, thus avoiding the deformation and damage to the prosthesis A caused by directly striking it with tools.

[0024] It should be noted that the indenter 10 can be made of a high-strength material. Even if a hammer or other tool damages the surface of the indenter 10, the contact surface between the indenter 10 and the prosthesis A will not be affected.

[0025] In addition, such as Figure 7As shown, the two ends of the arc-shaped convex surface 11 in the length direction of the trolley groove A1 are close to the end of the trolley groove A1. The span of the pressure head 10 on the prosthesis A is almost the same as the length of the prosthesis A, ensuring that the prosthesis A is subjected to consistent force.

[0026] Combination Figure 4-7 As shown, the arc-shaped convex surface 11 extends downward from the pressure head 10 at both ends along the length of the trolley groove A1 to form an arc-shaped convex surface 11 that is concave in the middle and convex at both ends. The lower end face of the pressure head 10 can match the contour shape of the trolley groove A1 on the prosthesis A, ensuring that the joint surfaces of the two fit together to achieve surface contact fit and concave-convex embedding fit.

[0027] It should be noted that the concave middle and convex ends of the arc-shaped convex surface 11 referred to here mean that the arc-shaped convex surface 11 is arched as a whole, rather than the arc surface in the middle of the arc-shaped convex surface 11 being concave towards the inside of the pressure head 10.

[0028] To further ensure uniform stress distribution on the prosthesis A, the arc-shaped convex surface 11 has arc-shaped stepped surfaces 12 at both edges along the width of the trochlear groove A1. The length of the arc-shaped stepped surfaces 12 is aligned with the length of the trochlear groove A1, and the arc-shaped stepped surfaces 12 form a surface contact with the upper edge of the convex edge A2 on the prosthesis A. The pressure head 10 can not only apply uniform pressure to the wall of the trochlear groove A1 on the prosthesis A, but also simultaneously apply uniform pressure to the convex edges A2 on both sides of the prosthesis A, thereby improving the uniform stress distribution on the prosthesis A.

[0029] As a preferred embodiment, considering that the contact surface between the pressure head 10 and the prosthesis A is an arc-shaped curved surface that is prone to slippage and displacement, in the length direction of the trolley groove A1, the rate of curvature change of the arc-shaped step surface 12 is different from the rate of curvature change of the arc-shaped convex surface 11, the rate of curvature change of the arc-shaped convex surface 11 is consistent with the rate of curvature change of the bottom surface of the trolley groove A1, and the rate of curvature change of the arc-shaped step surface 12 is consistent with the rate of curvature change of the upper edge of the convex edge A2. The arc-shaped convex surface 11 and the trolley groove A1, as well as the arc-shaped stepped surface 12 and the raised edge A2, are both concave-convex interlocking fits. However, the rate of curvature change of the arc-shaped stepped surface 12 is different from that of the arc-shaped convex surface 11. While ensuring that the arc-shaped convex surface 11 fits the trolley groove A1 and the arc-shaped stepped surface 12 fits the raised edge A2, the relative sliding between the arc-shaped convex surface 11 and the trolley groove A1 is affected by the fit between the arc-shaped stepped surface 12 and the raised edge A2, and vice versa. Therefore, the sliding of the indenter 10 in the extending direction of the trolley groove A1 on the prosthesis A is hindered, thus limiting the indenter 10 and accurately positioning it relative to the prosthesis A.

[0030] In other words, the aforementioned rate of curvature change refers to the degree of unevenness or concavity of the arc-shaped convex surface 11 and the arc-shaped stepped surface 12 within a unit interval. For example... Figure 5 As shown, the lower edge contour of the arc-shaped stepped surface 12 is more curved than the lower edge contour of the arc-shaped convex surface 11.

[0031] It should be noted that the design of the interlocking fit between the arc-shaped convex surface 11 and the trolley groove A1, and between the arc-shaped step surface 12 and the convex edge A2, cannot completely restrict the relative sliding of the indenter 10 and the prosthesis A. However, this design can play a certain role in limiting the position. With the operator's hand-held auxiliary positioning, the relative position of the indenter 10 on the prosthesis A can be kept stable.

[0032] As a preferred solution, combined with Figure 2 and Figure 3 As shown, a rod-shaped handle 20 is connected to the middle of the upper surface of the indenter 10. The core of the handle 20 intersects perpendicularly with the middle of the arc-shaped convex surface 11. In this design, the handle 20 on the indenter 10 allows the operator to hold the handle 20 and control the indenter 10 to push against the prosthesis A, thereby applying pressure to the prosthesis A and connecting it to the femur. Alternatively, pressure can be applied to the prosthesis A by striking the end of the handle 20 away from the indenter 10 with a hammer or other tool.

[0033] As a preferred solution, combined with Figure 3 and 4 As shown, the pressure head 10 and the handle 20 form a detachable fixed fit. When installing a prosthesis A of different specifications, the pressure head 10 can be removed from the handle 20 without replacing the handle 20, and a pressure head 10 of the corresponding specification can be installed on the handle 20 for targeted use.

[0034] As a preferred embodiment, a columnar connector 13 is provided on the upper end face of the pressure head 10. The connector 13 is coaxially arranged with the handle 20. A insertion hole 21 for inserting the connector 13 is provided on the end face of the handle 20 adjacent to the pressure head 10. The connector 13 and the insertion hole 21 form an interference fit. In this embodiment, the pressure head 10 and the handle 20 are connected by the connector 13 and the insertion hole 21, which allows for quick assembly and disassembly of the pressure head 10 and the handle 20, facilitating the replacement of the pressure head 10.

[0035] like Figure 2 and Figure 3 As shown, in order to ensure the stability of the handle 20 when tools such as hammers strike it, the end face of the handle 20 away from the pressure head 10 is perpendicular to the direction of the handle 20 rod core. This end provides a plane perpendicular to the handle 20 rod core, rather than an inclined plane or other irregular surface.

[0036] It should be noted that, considering that tools such as hammers need to be used for striking, the end of the handle 20 that is away from the pressure head 10 can be made of a high-strength material.

[0037] Example 2

[0038] Combination Figure 1 and Figure 10 In addition to providing a bio-type trochlear groove replacement inserter, this application also provides a bio-type trochlear groove replacement prosthesis, including a block-shaped prosthesis A. The upper surface of the prosthesis A is a continuous curved surface with a high center and low ends along its length. The two edges of the upper surface of the prosthesis A protrude upwards along its width to form convex edges A2. The convex edges A2 are arranged along the length of the prosthesis A, and the upper edge of the convex edges A2 is an arc shape with a high center and low ends along the length of the prosthesis A. The opposite sides of the two convex edges A2 and the upper surface of the prosthesis A enclose a trochlear groove A1. The lower surface of the prosthesis A is provided with a downwardly protruding mounting post A3. In the length direction of the trochlear groove A1, the rate of change of curvature of the upper edge of the convex edges A2 is different from the rate of change of curvature of the bottom surface of the trochlear groove A1.

[0039] In this scheme, such as the sectional view of prosthesis A (i.e. Figure 10 As shown in the figure, along the length of the trochlear groove A1, the height difference between the bottom contour line of the trochlear groove A1 and the upper contour line of the convex edge A2 is ΔH, and ΔH gradually decreases from the middle of the prosthesis A towards both ends. This reflects the relative degree of concavity and convexity between the bottom surface of the trochlear groove A1 and the upper edge of the convex edge A2. Figure 10 The upper edge of the convex part A2 is more convex than the bottom surface of the trolley groove A1.

[0040] When the pressure head 10 is used in conjunction with the prosthesis A, the arc-shaped convex surface 11 of the pressure head 10 and the trolley groove A1, as well as the arc-shaped step surface 12 and the convex edge A2, are in a concave-convex embedded fit. However, the rate of curvature change of the upper edge of the convex edge A2 is different from the rate of curvature change of the bottom surface of the trolley groove A1, and the rate of curvature change of the arc-shaped step surface 12 is different from the rate of curvature change of the arc-shaped convex surface 11. When the arc-shaped convex surface 11 is in contact with the bottom surface of the trolley groove A1 and the arc-shaped stepped surface 12 is in contact with the upper edge of the convex edge A2, due to the different rates of curvature change, the relative sliding between the arc-shaped convex surface 11 and the bottom surface of the trolley groove A1 in the groove length direction will be hindered by the concave-convex interlocking fit between the arc-shaped stepped surface 12 and the convex edge A2. Conversely, the relative sliding between the arc-shaped stepped surface 12 and the convex edge A2 will be hindered by the concave-convex interlocking fit between the arc-shaped convex surface 11 and the trolley groove A1. They restrict each other, thereby limiting the position between the pressure head 10 and the prosthesis A. At the same time, this also facilitates accurate positioning between the pressure head 10 and the prosthesis A. When an external force is applied to the pressure head 10 to push the prosthesis A towards the femur for positioning and installation, even if the direction of the external force is not parallel to the core direction of the mounting post A3 on the prosthesis A and an oblique force is generated, the pressure head 10 will not easily slip off from the prosthesis A. Thus, the pressure head 10 can smoothly drive the mounting post A3 on the prosthesis A into the corresponding mounting hole on the femur.

Claims

1. A biological trowel trench replacement injector, characterized in that: The lower end face of the block-shaped pressure head (10) is provided with an arc-shaped convex surface (11), which is a curved surface that forms a surface contact with the inner surface of the trolley groove (A1) formed on the upper surface of the prosthesis (A).

2. The injector for replacing biological pulley trenches according to claim 1, characterized in that: The arc-shaped convex surface (11) extends downward from the pressure head (10) at both ends along the length of the trolley groove (A1) to form an arc-shaped convex surface (11) that is concave in the middle and convex at both ends.

3. The injector for replacing biological pulley trenches according to claim 1 or 2, characterized in that: The arc-shaped convex surface (11) has an arc-shaped step surface (12) at the two sides of the width direction of the trolley groove (A1). The length direction of the arc-shaped step surface (12) is consistent with the length direction of the trolley groove (A1). The arc-shaped step surface (12) is a curved surface that forms a surface contact with the upper edge of the convex edge (A2) on the prosthesis (A).

4. The injector for replacing biological pulley trenches according to claim 3, characterized in that: Along the length of the trolley groove (A1), the rate of curvature change of the arc-shaped step surface (12) is different from that of the arc-shaped convex surface (11), the rate of curvature change of the arc-shaped convex surface (11) is consistent with the rate of curvature change of the bottom surface of the trolley groove (A1), and the rate of curvature change of the arc-shaped step surface (12) is consistent with the rate of curvature change of the upper edge of the convex edge (A2).

5. The injector for replacing biological pulley trenches according to claim 1, characterized in that: A rod-shaped handle (20) is connected to the middle of the upper end face of the pressure head (10), and the core of the handle (20) intersects perpendicularly with the middle of the arc-shaped convex surface (11).

6. The injector for replacing biological pulley trenches according to claim 5, characterized in that: The pressure head (10) and the handle (20) are detachably fixed together.

7. The injector for replacing biological pulley trenches according to claim 6, characterized in that: A columnar connector (13) is provided on the upper end face of the pressure head (10). The connector (13) and the handle (20) are arranged coaxially. A plug hole (21) for inserting the connector (13) is provided on the end face of the handle (20) near the pressure head (10). The connector (13) and the plug hole (21) form an interference fit.

8. The injector for replacing biological pulley trenches according to claim 5, characterized in that: The end face of the handle (20) away from the pressure head (10) is perpendicular to the direction of the rod core of the handle (20).

9. The injector for replacing biological pulley trenches according to claim 5, characterized in that: The handle (20) has anti-slip texture (22) on its handle body.

10. A bio-type trochlear groove replacement prosthesis, comprising a block-shaped prosthesis (A), the upper surface of the prosthesis (A) being a continuous curved surface with a high center and low ends along its length, the two edges of the upper surface of the prosthesis (A) protruding upwards along its width to form raised edges (A2), the raised edges (A2) being arranged along the length of the prosthesis (A) and the upper edge of the raised edges (A2) being an arc shape with a high center and low ends along the length of the prosthesis (A), the opposite sides of the two raised edges (A2) and the upper surface of the prosthesis (A) forming a trochlear groove (A1), and the lower surface of the prosthesis (A) being provided with a downwardly protruding mounting post (A3), characterized in that: The rate of change of curvature of the upper edge of the raised edge (A2) is different from the rate of change of curvature of the bottom surface of the trolley groove (A1).

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