A method of using a gap equalizer

Abstract

The application discloses a method for using a gap balancing plate and belongs to the technical field of medical auxiliary tools. One side of the gap balancing plate is provided with a horizontally arranged first abutting edge. The gap balancing plate is provided with a second abutting edge and at least one third abutting edge. The second abutting edge is arranged in parallel with the first abutting edge, and the third abutting edge forms a first angle with the first abutting edge. In the case that bone anatomical markers cannot be found, the application can be accurately positioned, the rotation of a femoral prosthesis can be directly determined, the operation time is saved, the operation efficiency is improved, and the postoperative healing effect is improved.

Description

[0001] This invention is a divisional application of patent document CN111388053A; the application date of patent document CN111388053A is April 7, 2020, the application number is 202010266738.8, the patent title is a gap balancing plate and its usage method, and the applicant is Shanghai Tenth People's Hospital. Technical Field

[0002] This invention relates to the technical field of medical assistive tools, and more particularly to a method of using a gap balancing plate. Background Technology

[0003] GII and Legion are two different prosthesis models. GII is a neutral osteotomy, not a 3-degree external rotation osteotomy; Legion is a neutral osteotomy with a 3-degree external rotation angle. Therefore, GII results in the same amount of osteotomy on both the medial and lateral condyles, requiring a prosthesis with unequal condylar thickness. Legion, with its neutral osteotomy and 3-degree external rotation angle, has unequal osteotomy on both sides, but no 3-degree angle, so the prosthesis does not have this 3-degree unequal thickness issue, resulting in equal thickness on both sides. GII only appears slightly off-center. Because normal flexion is 3-degree external rotation, GII's neutral osteotomy has a 3-degree angle, while Legion's 3-degree external rotation results in a flat osteotomy. The osteotomy line is parallel to the intercondylar line.

[0004] When determining femoral prosthesis rotation, osteotomy measurement involves locating and identifying bony anatomical landmarks such as the AP line and the posterior femoral condyle line. Osteotomy is then performed using these landmarks to determine the femoral prosthesis rotation. However, in many clinical cases, bony landmarks are not readily apparent, and in some cases, they are even impossible to find. This can lead to incorrect judgments and positioning during surgery. Summary of the Invention

[0005] To address the issue that existing methods require identifying bony anatomical landmarks on the femoral osteotomy surface before implanting a femoral prosthesis between the femur and tibia, and the current practice of using a gap balance plate to accurately locate the prosthesis even when bony anatomical landmarks are unavailable, the aim is to provide a method for using a gap balance plate that can accurately locate the prosthesis even when bony anatomical landmarks are unavailable. This allows for direct determination of the rotation of the femoral prosthesis, saving surgical time, improving surgical efficiency, and enhancing postoperative healing.

[0006] The specific technical solution is as follows: A method of using a gap balancing plate, comprising the gap balancing plate, the method comprising: Step S1: With osteotomy surfaces formed at both the end of the femur near the tibia and the end of the tibia near the femur, and the osteotomy surfaces on the femur and the tibia being perpendicular to each other, one side of the gap balance plate abuts against the osteotomy surface of the femur, and the first abutting edge of one side of the gap balance plate abuts against the osteotomy surface of the tibia. Step S2: Draw a line along the second abutment edge or one of the third abutment edges on the osteotomy surface of the femur; The gap balance plate has a first horizontal abutment edge on one side, a second abutment edge and at least one third abutment edge on the gap balance plate, the second abutment edge is parallel to the first abutment edge, and the third abutment edge forms a first angle with the first abutment edge.

[0007] In the above-described method of use, the gap balance plate is provided with a hand-held part.

[0008] In the above-described method of use, the gap balance plate is provided with two third abutting edges, the two third abutting edges forming the first angle with the first abutting edge respectively, and the two third abutting edges forming a second angle.

[0009] In the above usage method, the first angle is 3 degrees and the second angle is 6 degrees.

[0010] In the above-described method of use, the other side of the gap balance plate is provided with a second abutment edge, the gap balance plate is provided with two first through slots, and the side wall of each first through slot is provided with a third abutment edge.

[0011] In the above-described method of use, the other side of the gap balance plate is provided with a second abutment edge, the gap balance plate is provided with a second through groove, an abutment rod is movably provided in the second through groove, the two ends of the abutment rod are respectively slidably locked with the two ends of the second through groove, and the side wall of the abutment rod is provided with the third abutment edge.

[0012] In the above-described method of use, a rotating mechanism is provided between the gap balance plate and the handheld part, and the handheld part is rotatably connected to the gap balance plate through the rotating mechanism.

[0013] In the above-described method of use, the gap balance plate rotates 180 degrees around the central axis of the handheld part.

[0014] In the above-described method of use, the gap balancing plate is transparent.

[0015] The positive effects of the above technical solution compared with the existing technology are: This invention features osteotomy surfaces at both ends of the femur and tibia, and utilizes gravity to ensure that, with the knee naturally flexed at 90 degrees, the osteotomy surfaces on the femur and tibia are perpendicular. A gap balance plate rests against the osteotomy surface of the femur, with a first abutment edge on one side of the plate against the osteotomy surface of the tibia. A line is drawn along either a second or third abutment edge on the osteotomy surface of the femur. The osteotomy line determined by the second abutment edge is fitted to the Legion prosthesis, and the osteotomy line determined by the third abutment edge is fitted to the GII prosthesis. This invention provides accurate positioning, directly determining the rotation of the femoral prosthesis, saving surgical time, improving surgical efficiency, and enhancing postoperative healing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the gap balancing plate of the present invention from one perspective. Figure 2 This is a schematic diagram of the overall structure of the gap balancing plate of the present invention from another perspective; Figure 3 This is a schematic diagram of the overall structure of the gap balance plate of the present invention in use. Figure 4 This is a schematic diagram of the overall structure of the first embodiment of the gap balancing plate of the present invention; Figure 5 This is a cross-sectional view of the overall structure of the first embodiment of the gap balancing plate of the present invention; Figure 6 This is a schematic diagram of the overall structure of the second embodiment of the gap balancing plate of the present invention; Figure 7 This is a schematic diagram of the overall structure of the second embodiment of the gap balance plate of the present invention from one perspective; Figure 8 This is a cross-sectional view of the overall structure of the second embodiment of the gap balance plate of the present invention from another perspective; In the attached diagram: 1. First abutment edge; 2. Second abutment edge; 3. Third abutment edge; 4. Gap balance plate; 5. Handhold part; 6. First through groove; 7. Second through groove; 8. Rotating mechanism; 9. Protruding plate; 10. First threaded hole; 11. Bolt; 12. Bearing; 13. Abutment rod; 14. Slide groove; 15. Movable groove; 16. Mounting hole; 17. Second threaded hole; 21. Femur; 22. Tibia. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0018] like Figures 1 to 8As shown, a preferred embodiment of a gap balance plate is illustrated. The gap balance plate 4 has a first abutment edge 1 horizontally arranged on one side, a second abutment edge 2 and at least one third abutment edge 3 on the gap balance plate 4, the second abutment edge 2 is arranged parallel to the first abutment edge 1, and the third abutment edge 3 forms a first angle with the first abutment edge 1.

[0019] Furthermore, as a preferred embodiment, the gap balance plate 4 is provided with a handheld part 5.

[0020] Furthermore, as a preferred embodiment, the first angle is 3 degrees.

[0021] Furthermore, as a preferred embodiment, the gap balance plate 4 is provided with two third abutting edges 3, the two third abutting edges 3 forming a first angle with the first abutting edge 1 respectively, and the two third abutting edges 3 forming a second angle.

[0022] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention.

[0023] In addition to the above, the present invention also has the following embodiments: In further embodiments of the present invention, please continue to refer to Figures 1 to 8 As shown, the second angle is 6 degrees.

[0024] In a further embodiment of the present invention, the gap balancing plate 4 is transparent. Preferably, the transparent plate facilitates observation.

[0025] Preferably, scale lines are provided at both ends of the gap balance plate 4.

[0026] Preferably, the hand-held part 5 is a handle. Preferably, the handle is fixedly connected to the gap balance plate 4 or rotatably fixedly connected.

[0027] First embodiment: like Figures 4 to 5 As shown, a gap balance plate of a preferred embodiment is provided. The gap balance plate 4 has a second abutment edge 2 on the other side, and two first through grooves 6 are provided on the gap balance plate 4. Each first through groove 6 has a third abutment edge 3 on its side wall.

[0028] Preferably, the two first through slots 6 are symmetrically located on both sides of the gap balance plate 4.

[0029] In a further embodiment of the present invention, a rotating mechanism 8 is provided between the gap balance plate 4 and the handheld part 5, and the handheld part 5 is rotatably connected to the gap balance plate 4 through the rotating mechanism 8.

[0030] In a further embodiment of the present invention, the gap balance plate 4 is rotated 180 degrees around the central axis of the handheld part 5.

[0031] In this embodiment, when a prosthesis is installed on one of the patient's foot joints, the side of the gap balance plate 4 away from the handpiece 5 is placed against the osteotomy surface of the femur 21, and the first abutting edge 1 is placed against the osteotomy surface of the tibia 22. A line can be drawn along the second abutting edge 2 or a third abutting edge 3.

[0032] In this embodiment, when a prosthesis needs to be installed on the other joint of the patient's foot, the gap balance plate 4 is rotated 180 degrees by the rotating mechanism 8, so that the side of the gap balance plate 4 away from the hand handle 5 is against the osteotomy surface of the femur 21, and the second abutting edge 2 is against the osteotomy surface of the tibia 22. A line can be drawn along the first abutting edge 1 or the other third abutting edge 3.

[0033] Preferably, the rotating mechanism 8 includes a bearing 12, a convex plate 9, and a bolt 11.

[0034] Preferably, a protruding plate 9 is provided on the handle, and a first threaded hole 10 is provided symmetrically on both sides of the gap balance plate 4. A bolt 11 passes through the protruding plate 9 and is fixedly connected to one of the first threaded holes 10. After the gap balance plate 4 is rotated 180 degrees, the bolt 11 passes through the protruding plate 9 and is fixedly connected to the other first threaded hole 10.

[0035] Preferably, the gap balance plate 4 is rotatably connected to the handle via bearing 12.

[0036] Second embodiment: like Figures 6 to 8 As shown, a preferred embodiment of the gap balance plate is illustrated. The structure of the second embodiment is generally the same as that of the first embodiment, except that: a second abutment edge 2 is provided on the other side of the gap balance plate 4, a second through groove 7 is provided on the gap balance plate 4, an abutment rod 13 is movably provided in the second through groove 7, the two ends of the abutment rod 13 are slidably locked with the two ends of the second through groove 7 respectively, and a third abutment edge 3 is provided on the side wall of the abutment rod 13.

[0037] In this embodiment, when a prosthesis is installed on one of the patient's foot joints, one end of the abutment rod 13 is slid to the side close to the first abutment edge 1 and locked, and the other end of the abutment rod 13 is slid to the side away from the first abutment edge 1 and locked, so that the third abutment edge 3 of the abutment rod 13 and the first abutment edge 1 form a first angle; or one end of the abutment rod 13 is slid to the side away from the first abutment edge 1 and locked, and the other end of the abutment rod 13 is slid to the side close to the first abutment edge 1 and locked, so that the third abutment edge 3 of the abutment rod 13 and the first abutment edge 1 form a first angle.

[0038] Preferably, the gap balance plate 4 has sliding grooves 14 at both ends of the second through groove 7, and the two ends of the abutment rod 13 extend into the two sliding grooves 14 respectively. A movable groove 15 is provided on the side of each sliding groove 14 near the handle 5, and the movable groove 15 is connected to the sliding groove 14. Mounting holes 16 are provided at both ends of the abutment rod 13. Two second threaded holes 17 are provided on the side of each movable groove 15 away from the handle 5, and both second threaded holes 17 are located within a movable groove 15, respectively located at both ends of the movable groove 15. A bolt 11 passes through the groove in sequence. A movable groove 15, a mounting hole 16, and a second threaded hole 17 within the movable groove 15 fix one end of the abutment rod 13. Another bolt 11 passes through another movable groove 15, another mounting hole 16, and a second threaded hole 17 within the other movable groove 15 to fix the other end of the abutment rod 13. The second threaded hole 17 within the movable groove 15 and the second threaded hole 17 within the other movable groove 15 are not symmetrically arranged in the second through groove 7. The second threaded hole 17 within the movable groove 15 and the second threaded hole 17 within the other movable groove 15 are symmetrically arranged in the second through groove 7.

[0039] Preferably, the gap balance plate 4 is a detachable structure, and the end of the gap balance plate 4 is provided with a groove for placing the abutment rod 13, and the groove is plugged with a plug after the abutment rod 13 is installed.

[0040] The following explains how to use this gap balancing plate, including: Step S1: With osteotomy surfaces formed at both the end of the femur 21 near the tibia 22 and the end of the tibia 22 near the femur 21, and the osteotomy surfaces on the femur 21 and tibia 22 being perpendicular to each other, one side of the gap balance plate 4 is placed against the osteotomy surface of the femur 21, and the first abutting edge 1 of one side of the gap balance plate 4 is placed against the osteotomy surface of the tibia 22. Step S2: Draw a line on the osteotomy surface of the femur 21 along the second abutment edge 2 or a third abutment edge 3.

[0041] The present invention adapts the osteotomy line determined by the marker line drawn along the second abutment edge 2 to the Legion prosthesis, and adapts the osteotomy line determined by the marker line drawn along the third abutment edge 3 to the GII prosthesis.

[0042] This invention can accurately locate and directly determine the rotation of the femoral prosthesis, saving surgical time, improving surgical efficiency, and enhancing postoperative healing.

[0043] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

[0044] The contents not covered in this invention are applicable to existing technologies. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention; at the same time, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A method of using a gap balancing plate, characterized in that, The method of use includes: Step S1: With osteotomy surfaces formed at both the end of the femur near the tibia and the end of the tibia near the femur, and the osteotomy surfaces on the femur and the tibia being perpendicular to each other, one side of the gap balance plate abuts against the osteotomy surface of the femur, and the first abutting edge of one side of the gap balance plate abuts against the osteotomy surface of the tibia. Step S2: Draw a line along the second abutment edge or a third abutment edge on the osteotomy surface of the femur; The gap balance plate has a first abutment edge arranged horizontally on one side, a second abutment edge and at least one third abutment edge on the gap balance plate, the second abutment edge is arranged parallel to the first abutment edge, and the third abutment edge forms a first angle with the first abutment edge.

2. The method of use according to claim 1, characterized in that, The gap balance plate is equipped with a hand-held part.

3. The method of use according to claim 1, characterized in that, The gap balance plate is provided with two third abutting edges, which form the first angle with the first abutting edge respectively, and form a second angle between the two third abutting edges.

4. The method of use according to claim 3, characterized in that, The first angle is 3 degrees, and the second angle is 6 degrees.

5. The method of use according to claim 3, characterized in that, The gap balance plate has a second abutment edge on the other side, and two first through slots are provided on the gap balance plate. Each of the first through slots has a third abutment edge on its sidewall.

6. The method of use according to claim 3, characterized in that, The gap balance plate has a second abutment edge on the other side, a second through groove on the gap balance plate, an abutment rod movably disposed in the second through groove, the two ends of the abutment rod being slidably locked to the two ends of the second through groove, and the abutment rod having a third abutment edge on its side wall.

7. The method of use according to claim 2, characterized in that, A rotating mechanism is provided between the gap balance plate and the handheld part, and the handheld part is rotatably connected to the gap balance plate through the rotating mechanism.

8. The method of use according to claim 6, characterized in that, The gap balance plate rotates 180 degrees around the central axis of the handheld part.

9. The method of use according to claim 1, characterized in that, The gap balancing plate is transparent.

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