A gap equalizer plate and method of using the same

Abstract

This invention discloses a gap balancing plate and its method of use, belonging to the technical field of medical auxiliary tools. The gap balancing plate has a first horizontally positioned abutment edge on one side, a second abutment edge, and at least one third abutment edge. 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. This invention enables accurate positioning even when bony anatomical landmarks are unavailable, allowing direct determination of femoral prosthesis rotation, saving surgical time, improving surgical efficiency, and enhancing postoperative healing.

Description

Technical Field

[0001] This invention relates to the technical field of medical assistive tools, and more particularly to a gap balancing plate and its method of use. Background Technology

[0002] 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 surface after osteotomy. The osteotomy line is parallel to the intercondylar line.

[0003] 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

[0004] To address the current issue that existing methods require identifying bony anatomical landmarks on the femoral osteotomy surface before implanting a femoral prosthesis between the femur and tibia, which often result in unclear or unidentifiable bony landmarks, this invention aims to provide a gap balancing plate and its usage method. This plate can accurately locate the prosthesis even when bony anatomical landmarks are unavailable, directly determining the rotation of the femoral prosthesis, saving surgical time, improving surgical efficiency, and enhancing postoperative healing.

[0005] The specific technical solution is as follows:

[0006] A gap balancing plate has a first horizontally arranged abutment edge on one side, a second abutment edge and at least one third abutment edge on the gap balancing plate, the second abutment edge being arranged parallel to the first abutment edge, and the third abutment edge forming a first angle with the first abutment edge.

[0007] The aforementioned gap balance plate includes a handheld portion.

[0008] The aforementioned gap balancing plate has two third abutting edges, which form a first angle with the first abutting edge and a second angle with each other.

[0009] In the aforementioned gap balance plate, the first angle is 3 degrees and the second angle is 6 degrees.

[0010] The aforementioned gap balance plate has a second abutment edge on its other side, two first through slots on the gap balance plate, and a third abutment edge on the sidewall of each first through slot.

[0011] In the aforementioned gap balance plate, 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 aforementioned gap balance plate, 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] The aforementioned gap balance plate, wherein the gap balance plate rotates 180 degrees around the central axis of the handheld part.

[0014] The aforementioned gap balancing plate is transparent.

[0015] A method of using a gap balancing plate, characterized in that it includes any one of the gap balancing plates described above, and the method of using it includes:

[0016] 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.

[0017] Step S2: Draw a line along the second abutment edge or one of the third abutment edges on the osteotomy surface of the femur.

[0018] The positive effects of the above technical solution compared with the existing technology are:

[0019] 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

[0020] Figure 1 This is a schematic diagram of the overall structure of a gap balancing plate and its usage method according to the present invention;

[0021] Figure 2 This is a schematic diagram of the overall structure of a gap balancing plate and its usage method according to the present invention;

[0022] Figure 3 This is a schematic diagram of the overall structure of a gap balancing plate and its usage method under the present invention in use.

[0023] Figure 4 This is a schematic diagram of the overall structure of a first embodiment of the gap balancing plate and its usage method according to the present invention;

[0024] Figure 5 This is a cross-sectional view of the overall structure of a first embodiment of a gap balancing plate and its usage method according to the present invention;

[0025] Figure 6 This is a schematic diagram of the overall structure of a second embodiment of the gap balancing plate and its usage method according to the present invention;

[0026] Figure 7 This is a schematic diagram of the overall structure of a second embodiment of the gap balancing plate and its usage method according to the present invention;

[0027] Figure 8 This is a cross-sectional view of the overall structure of a second embodiment of the gap balancing plate and its usage method according to the present invention;

[0028] 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; 23. Osteotomy surface. Detailed Implementation

[0029] 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.

[0030] Figure 1 This is a schematic diagram of the overall structure of a gap balancing plate and its usage method according to the present invention. Figure 2 This is a schematic diagram of the overall structure of a gap balancing plate and its usage method according to the present invention. Figure 3 This is a schematic diagram of the overall structure of the gap balancing plate and its usage method according to the present invention in the usage state. Figure 4 This is a schematic diagram of the overall structure of a gap balancing plate and its usage method according to the present invention, in a first embodiment. Figure 5 This is a cross-sectional view of the overall structure of a first embodiment of the gap balancing plate and its usage method according to the present invention. Figure 6 This is a schematic diagram of the overall structure of a second embodiment of the gap balancing plate and its usage method according to the present invention. Figure 7 This is a schematic diagram of the overall structure of a second embodiment of the gap balancing plate and its usage method according to the present invention. Figure 8 This is a cross-sectional view of the overall structure of a second embodiment of the gap balancing plate and its usage method of the present invention, as shown below. Figures 1 to 8 As 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.

[0031] Furthermore, as a preferred embodiment, the gap balance plate 4 is provided with a handheld part 5.

[0032] Furthermore, as a preferred embodiment, the first angle is 3 degrees.

[0033] 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.

[0034] 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.

[0035] In addition to the above, the present invention also has the following embodiments:

[0036] In further embodiments of the present invention, please continue to refer to Figures 1 to 8 As shown, the second angle is 6 degrees.

[0037] In a further embodiment of the present invention, the gap balancing plate 4 is transparent. Preferably, the transparent plate facilitates observation.

[0038] Preferably, scale lines are provided at both ends of the gap balance plate 4.

[0039] 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.

[0040] First embodiment:

[0041] 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.

[0042] Preferably, the two first through slots 6 are symmetrically located on both sides of the gap balance plate 4.

[0043] 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.

[0044] 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.

[0045] 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 23 of the femur 21, and the first abutting edge 1 is placed against the osteotomy surface 23 of the tibia 22. A line can be drawn along the second abutting edge 2 or a third abutting edge 3.

[0046] 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 abuts against the osteotomy surface 23 of the femur 21, and the second abutting edge 2 abuts against the osteotomy surface 23 of the tibia 22. A line can be drawn along the first abutting edge 1 or the other third abutting edge 3.

[0047] Preferably, the rotating mechanism 8 includes a bearing 12, a convex plate 9, and a bolt 11.

[0048] 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.

[0049] Preferably, the gap balance plate 4 is rotatably connected to the handle via bearing 12.

[0050] Second embodiment:

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] The following explains how to use this gap balancing plate, including:

[0056] Step S1: With osteotomy surfaces 23 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 23 on the femur 21 and the osteotomy surfaces 23 on the tibia 22 being set perpendicularly, one side of the gap balance plate 4 is placed against the osteotomy surface 23 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 23 of the tibia 22.

[0057] Step S2: Draw a line on the osteotomy surface 23 of the femur 21 along the second abutment edge 2 or a third abutment edge 3.

[0058] 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.

[0059] This invention can accurately locate and directly determine the rotation of the femoral prosthesis, saving surgical time, improving surgical efficiency, and enhancing postoperative healing.

[0060] 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.

Claims

1. A gap balancing plate, characterized in that, The gap balance plate has a first horizontally arranged 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 arranged parallel to the first abutment edge, and the third abutment edge forms a first angle with the first abutment edge; The gap balance plate is provided with a hand-held part; a rotating mechanism is provided between the gap balance plate and the hand-held part, the hand-held part is rotatably connected to the gap balance plate through the rotating mechanism, and the gap balance plate rotates 180 degrees around the central axis of the hand-held part; The gap balance plate is provided with a second abutment edge on the other side, and the gap balance plate is provided with two first through slots; When the gap balance plate is provided with two first through slots, each first through slot has a third abutment edge on its sidewall. The two third abutment edges form a first angle with the first abutment edge respectively, and a second angle is formed between the two third abutment edges. The first angle is 3 degrees and the second angle is 6 degrees. The gap balancing plate is transparent. The hand-held part is a handle; The rotating mechanism includes bearings, a cam, and bolts; A convex plate is provided on the handle, and a first threaded hole is provided symmetrically on both sides of the clearance balance plate. A bolt passes through the convex plate and is fixedly connected to one of the first threaded holes. After the clearance balance plate is rotated 180 degrees, the bolt passes through the convex plate and is fixedly connected to the other first threaded hole. The gap balance plate and the handle are rotatably connected by bearings.

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