Test mold for biological type pulley groove replacement

Abstract

The utility model belongs to the technical field of medical instruments, and particularly relates to a biological type pulley groove replacement test mold which comprises a test mold body, and the test mold body is provided with positioning holes penetrating through the upper surface and the lower surface of the test mold body and adjusting holes penetrating through the side face and the lower surface of the test mold body. According to the utility model, the needle body can penetrate through the adjusting hole, and the needle body can fix and dismount the test mold body very conveniently, so that the convenience of the posture adjusting operation of the test mold body can be improved. After the posture of the test mold body is adjusted, a drill rod penetrates through the positioning hole to drill a hole in the section of the femur to be connected to form a prosthesis mounting hole, so that accurate positioning can be provided for prosthesis implantation, and the success rate of a prosthesis implantation operation is greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical equipment, and particularly relates to a biological trial mold for trochlear groove replacement. Background Art

[0002] Patellar dislocation in pet dogs and cats due to trochlear injury or developmental deformity can be treated with patellofemoral trochlear replacement surgery, which involves resection of the damaged trochlear groove on the femur and implantation of a replacement trochlear prosthesis. The placement of the implant directly affects the position of the trochlear groove, which in turn alters the patellar path. The placement of the trochlear prosthesis is typically not adjustable after implantation, so to achieve optimal replacement results, a trial model with adjustable placement is required to assess the patellar trajectory in the trochlear groove. Utility Model Content

[0003] The utility model aims to provide a biological trochlear groove replacement trial mold which is easy to adjust and can provide reliable positioning for trochlear prosthesis implantation.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: a biological trochlear groove replacement test mold, including a test mold body, the test mold body has positioning holes passing through its upper and lower surfaces and adjustment holes passing through the side and lower surfaces of the test mold body.

[0005] Compared to existing technologies, the present invention offers the following technical advantages: The adjustment hole allows the needle to pass through, making it very convenient for the needle to secure and remove the trial mold body, thereby improving the convenience of adjusting the trial mold body's position. After the trial mold body's position is adjusted, the drill rod passes through the positioning hole to drill a hole in the femoral section to be connected to form the prosthesis mounting hole, providing accurate positioning for prosthesis implantation, thereby greatly improving the success rate of prosthesis implantation surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] The following is a brief description of the contents and symbols in the drawings of this specification:

[0007] Figure 1 、 2 It is a three-dimensional schematic diagram of embodiment 1;

[0008] Figure 3 is a half-cutaway perspective schematic diagram of embodiment 1;

[0009] Figure 4 It is a three-dimensional schematic diagram of the embodiment 1 cut at the plane where the adjusting hole core is located;

[0010] Figure 5 is a top view of embodiment 2;

[0011] Figure 6 yes Figure 5 AA cross-sectional view;

[0012] Figure 7 This is a front view of Example 2;

[0013] Figure 8 yes Figure 7 BB cross-sectional view;

[0014] Figure 9 It is a three-dimensional schematic diagram of the second embodiment. DETAILED DESCRIPTION

[0015] The specific implementation of the present invention will be further described in detail below through description of embodiments in conjunction with the accompanying drawings.

[0016] A biotype trochlear groove replacement trial mold includes a trial mold body 10, the trial mold body 10 has positioning holes 11 passing through the upper and lower surfaces thereof and adjustment holes 12 passing through the side and lower surfaces of the trial mold body 10. Figure 1 、 2 As shown, the upper surface 13 of the trial mold body 10 is the trochlear surface that cooperates with the patella, and the lower surface 14 is flat as a whole. During the operation, the trial mold body 10 is placed on the overall planar cross-section of the femur, so that the lower surface 14 of the trial mold body 10 is in contact with the femoral cross-section and the upper surface 13 faces the surgeon, so that the surgeon can observe and evaluate whether the posture of the upper surface 13 can provide a reliable limiting guide for the patella. Specifically, the trial mold body 10 can be initially fixed on the femoral cross-section by inserting a needle through the adjustment holes 12 on both sides of the trial mold body 10, and then it can be judged whether the posture of the trochlear surface constructed by the upper surface 13 of the trial mold body 10 matches the designed posture. If it does not match, the needle body is removed to adjust the trial mold body 10. The operation of fixing and removing the trial mold body 10 using the needle body is very convenient, thereby improving the convenience of the posture adjustment operation of the trial mold body 10. At the same time, restricted by the cavity posture of the adjustment hole 12, the needle body is in a posture with the bottom close to each other and the top away from each other, so that the upper surface 13 of the trial mold body 10 is exposed between the needle rod shaft, which reserves a large space for the evaluation operation of the pulley surface posture. After the posture of the trial mold body 10 is adjusted, the needle body is retained and the posture of the trial mold body 10 is maintained. The drill rod is used to pass through the positioning hole 11 and is fixedly connected to the femur located below it. The upper surface of the prosthesis is basically consistent with the upper surface of the trial mold body 10, and the prosthesis has a mounting column with a column core consistent with the hole core of the positioning hole 11. After removing the needle body, drill rod and trial mold body 10, the mounting column of the prosthesis is pressed against the hole mouth of the drill rod drilled hole, and the prosthesis is pressed downward to achieve the connection between the prosthesis and the femoral cross section, ensuring the consistency of the implanted posture of the prosthesis and the posture determined by the trial mold body 10.

[0017] The middle part of the femoral cross section to be connected is cancellous bone and the periphery is hard cortical bone. The positioning hole 11 is arranged adjacent to the circumferential edge of the trial mold body 10. In this way, the hole drilled by the drill rod is arranged adjacent to the hard cortical bone, which can ensure the accuracy of the positioning of the trial mold body 10. Figure 1 、 2 As shown, the trial mold body 10 is provided on both sides. To avoid interference between the needle body and the drill rod during surgery, the positioning hole 11 avoids the adjustment hole 12 and is provided at the front or rear end of the trial mold body 10. In the first embodiment, the front and rear ends of the trial mold body 10 are each provided with a positioning hole 11. In the second embodiment, the front end of the trial mold body 10 is provided with a positioning hole 11, and the rear end is provided with two positioning holes 11 at intervals.

[0018] As attached Figure 1 、 3 As shown in Figures 4 and 5, the upper surface 13 of the test mold body 10 is a smooth curved surface as a whole. It is in the shape of a groove with a low center and high sides in the width direction, and in the shape of a hill with a high center and low sides in the length direction. A flat concave platform 111 is provided at the upper edge of the positioning hole 11. The flat concave platform 111 is used to abut against the end face of the drilling rig for positioning. Since the upper surface 13 is in the shape of a hill with a high center and low sides in the length direction, and the positioning holes 11 are provided at both ends of the test mold body 10 in the length direction, the table surface of the flat concave platform 111 located at the upper edge of the positioning hole 11 adjacent to the center of the test mold body 10 is connected to the upper surface 13a on the high side through the vertical column 112, and the table surface away from the center of the test mold body 10 is connected to the upper surface 13b on the low side to form a joining ridge 113, as shown in the attached figure. Figure 1 、 5 As shown, the surface of the planar concave platform 111 is in a C-shaped ring shape as a whole.

[0019] The lower surface 14 of the test mold body 10 is flat as a whole, and an inner groove / hole 141 is provided on the lower surface 14 to form an anti-slip texture. Figure 3 、 7 As shown, the bottom of the anti-slip texture is located in the same planar base surface 142, and the peak of the anti-slip texture is located in the same planar peak surface 143, and the base surface 142 and the peak surface 143 are arranged in parallel. When the prosthesis is implanted, the ilium is displaced in the length direction of the groove constructed by the trochlear surface. When evaluating the posture of the upper surface 13 of the trial mold body 10, in order to prevent the trial mold body 10 from sliding relative to the femoral cross section in its length direction when the ilium or ilium prosthesis is displaced on the upper surface 13, in the preferred embodiment, the inner groove / hole 141 should have a groove portion or hole portion with a groove length / hole length direction perpendicular to the length direction of the trial mold body 10. Example 1 is shown in the attached Figure 2 、 4As shown, the lower surface 14 of the test mold body 10 is provided with inner grooves extending along the width direction of the test mold body 10, and the inner grooves are arranged at equal intervals in the length direction of the test mold body 10 to form a striped texture. Figure 7 、 9 As shown, the lower surface 14 of the trial mold body 10 is provided with inner grooves extending along the width and length of the trial mold body 10. These inner grooves form a checkerboard-like anti-slip texture on the bottom of the trial mold body 10. In other embodiments, the anti-slip texture can also be a wavy curved inner groove extending entirely along the width of the trial mold body 10, or a honeycomb or grid-like texture, whichever is more effective in preventing the trial mold body 10 from slipping.

[0020] Furthermore, in order to improve the positioning accuracy of the prosthesis implantation posture, it is ensured that the core of the hole drilled by the drill rod coincides with the core of the positioning hole 11, as shown in the attached Figure 6 As shown, the core line of the positioning hole 11 is perpendicular to the base surface 142 , and the table surface of the planar concave table 111 is perpendicular to the core line of the positioning hole 11 .

[0021] To prevent the positioning needles inserted into the positioning holes 12 from interfering with each other, the angle α between the core line of the adjustment hole 12 and the base surface 142 is arranged at an acute angle, and the spacing between the lower hole ends of the two adjustment holes 12 symmetrically arranged on both sides of the test mold body 10 is greater than 1 / 2 of the width dimension of the test mold body 10 at that location. In this way, after the needles are inserted into the cross section of the femur, there is still a certain distance between them, which can not only prevent the two needles from interfering with each other, but also allow each needle to have a certain adjustment range. To facilitate observation of the posture of the adjustment needle body, the upper edge of the adjustment hole 12 is folded outward to form a flared ring 121. The inner edge of the flared ring 121 is tilted, with its upper portion adjacent to the side wall surface of the test mold body 10 and its lower portion away from the side wall surface of the test mold body 10.

[0022] As attached Figure 5 As shown, in the second embodiment, the positioning holes 11 and adjustment holes 12 are arranged axially symmetrically on the trial mold body 10, with the axis of symmetry parallel to the length of the trial mold body 10 and located at the center of its width. This provides greater stability for the trial mold body 10, the prosthesis's adjustable posture, and the implanted state. In practice, the positioning holes 11 and adjustment holes 12 can also be adaptively adjusted to achieve an asymmetrical arrangement as needed.

Claims

1. A biological trochlear groove replacement test mold, characterized by: The trial mold body (10) comprises a trial mold body (10), wherein the trial mold body (10) has a positioning hole (11) penetrating the upper and lower surfaces thereof and an adjustment hole (12) penetrating the side surface and the lower surface of the trial mold body (10).

2. The biotype trochlear groove replacement test mold according to claim 1, characterized in that: The positioning hole (11) is arranged adjacent to the circumferential edge of the trial mold body (10).

3. The biotype trochlear groove replacement test mold according to claim 2, characterized in that: The positioning hole (11) is provided at the front end and / or the rear end of the trial mold body (10).

4. The biotype trochlear groove replacement test mold according to claim 1, characterized in that: The upper surface (13) of the test mold body (10) is a smooth curved surface as a whole. The upper surface (13) is in a groove shape with a low center and high sides in the width direction of the test mold body (10), and in a hill shape with a high center and low sides in the length direction of the test mold body (10); A plane concave platform (111) is provided at the upper edge of the positioning hole (11), the table surface of the plane concave platform (111) adjacent to the center of the test mold body (10) is connected to the upper surface (13a) of the high side through the vertical column (112), and the table surface away from the center of the test mold body (10) is connected to the upper surface (13b) of the low side to form a joint edge (113), the table surface of the plane concave platform (111) is perpendicular to the hole core line of the positioning hole (11), and the table surface of the plane concave platform (111) is in a C-shaped ring shape as a whole.

5. The biotype trochlear groove replacement test mold according to claim 1, characterized in that: The lower surface (14) of the test mold body (10) is flat as a whole, and an inner groove / hole (141) is provided on the lower surface (14) to form an anti-slip texture, wherein the bottom of the anti-slip texture is located in the same planar base surface (142), and the peak of the anti-slip texture is located in the same planar peak surface (143), and the base surface (142) and the peak surface (143) are arranged in parallel; The core line of the positioning hole (11) is perpendicular to the base surface (142), and the angle α between the core line of the adjustment hole (12) and the base surface (142) is an acute angle.

6. The biotype trochlear groove replacement trial mold according to claim 5, characterized in that: The inner groove / hole (141) comprises a groove portion / hole portion whose groove length / hole length extends along the width direction of the test mold body (10), and the groove portion / hole portion is arranged at equal intervals in the length direction of the test mold body (10) to form a striped texture.

7. The biotype trochlear groove replacement trial mold according to claim 1, characterized in that: The positioning holes (11) and the adjustment holes (12) are arranged axially symmetrically on the test mold body (10), with the axis of symmetry being parallel to the length direction of the test mold body (10) and located at the center in the width direction thereof.

8. The biotype trochlear groove replacement trial mold according to claim 7, characterized in that: The distance between the lower hole ends of the two adjustment holes (12) symmetrically arranged on both sides of the test mold body (10) is greater than 1 / 2 of the width direction dimension of the test mold body (10) at that location.

9. The biotype trochlear groove replacement trial mold according to claim 1, characterized in that: The upper edge of the adjusting hole (12) is folded outward to form a flared ring (121). The inner edge of the flared ring (121) is inclined, with its upper portion adjacent to the side wall of the test mold body (10) and its lower portion away from the side wall of the test mold body (10).

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