A soft tissue balancing device in knee replacement surgery and a method of using the same

Abstract

The present invention relates to the technical field of medical devices, and in particular to a soft tissue balancing device in knee replacement surgery and a method for using the same. A soft tissue balancing device in knee replacement surgery comprises a femoral fixation plate and an adjustment and positioning assembly, wherein the surface of the femoral fixation plate is formed with a waist-shaped groove, and the bottom surface of each waist-shaped groove is formed with a waist-shaped hole whose size is smaller than the waist-shaped groove. The adjustment and positioning assembly comprises a positioning block with a bionic appearance and a connecting column connected to the positioning block, wherein the diameter of the connecting column is smaller than the width of the waist-shaped hole, and a limiting plate is formed at one end of the connecting column passing through the waist-shaped hole, wherein the diameter of the limiting plate is larger than the width of the waist-shaped hole and smaller than the width of the waist-shaped groove, and a positioning hole is formed in the middle of the connecting column that passes through the connecting column and the positioning block. The position of the positioning block is adjustable, and when the detected knee joint pressure value is within an appropriate range, a hole is drilled at the position of the corresponding positioning hole on the femur. Since repeated bone repair and drilling are not required, damage to the femur can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a soft tissue balancing device in knee replacement surgery and a method of using the device. Background Art

[0002] Knee replacement is to make an artificial knee prosthesis according to the shape, structure and function of the human joint, and implant it into the human body through surgery to relieve the patient's joint pain and restore joint function. After knee replacement, if the medial and lateral collateral ligaments of the knee joint are loose or too tight, the knee joint will be unstable, and it will also lead to limited range of motion, improper patellar tracking, uneven wear of the femur and tibia, arthritis, pain and other problems.

[0003] Therefore, the quality of soft tissue balance during knee replacement surgery directly affects the postoperative knee function. In the past, a technique for balancing the tension of the collateral ligaments during knee replacement surgery was "ligament release", which reduces ligament tension by cutting the fibers of one or two ligaments. However, the "ligament release" technique cuts and damages the ligament tissue, causing the ligament tissue to weaken.

[0004] The existing invention patent with application publication number CN104970904A discloses a design of an individualized positioning template for total knee replacement based on MRI. In this scheme, the design of an individualized positioning template is completed according to the joint morphology of each patient's individual joints through the magnetic resonance imaging data of each patient's lower limbs. Through the design of an individualized positioning template to match each patient, the position of the nail hole is determined according to the individualized positioning template, and the subsequently installed knee joint prosthesis is made as consistent as possible with the patient's original bones, avoiding the problem of loose or too tight medial and lateral collateral ligaments of the patient.

[0005] However, the above technical solution has the following problems: the process from MRI to individualized template design is not only time-consuming and costly, but also the actual amount of femoral cutting and the location of the positioning template set by the surgeon during the operation are not exactly the same as those in the design. Therefore, there are still many patients with loose or tight collateral ligaments, and the individualized positioning template design method cannot completely solve the problem.

[0006] The existing invention patent with application publication number CN107802382A discloses a knee joint balance detection system and a balance determination method in total knee replacement surgery. In the invention, the knee joint pressure is measured during knee replacement surgery to determine whether the knee joint is balanced. If it is unbalanced, the knee joint is brought into a balanced state by appropriately repairing the bone or adjusting the position of the prosthesis, and then maintained in this position for surgical suturing.

[0007] The above-mentioned prior art solutions have the following defects: each time the bone is repaired or the position of the prosthesis is adjusted (it is necessary to drill a hole in the new position to fix the prosthesis), the femur will be damaged. If the knee joint cannot be balanced after multiple measurements and adjustments, excessive damage to the femur will be caused. Summary of the invention

[0008] In view of the deficiencies in the prior art, an object of the present invention is to provide a soft tissue balancing device in knee replacement surgery and a method of using the same.

[0009] The first purpose of the invention is to solve the problem of excessive damage to the femur caused by multiple adjustments of the prosthesis position during knee replacement surgery.

[0010] The second purpose of the invention is to provide a method for using the above-mentioned balancing device.

[0011] The above-mentioned first object of the present invention is achieved through the following technical scheme: a soft tissue balancing device in knee replacement surgery, including a femoral fixation plate and an adjustment and positioning component, the surface of the femoral fixation plate is formed with a waist-shaped groove, and the bottom surface of each waist-shaped groove is formed with a waist-shaped hole whose size is smaller than the waist-shaped groove, the adjustment and positioning component includes a positioning block with a bionic shape and a connecting column connected to the positioning block, the diameter of the connecting column is smaller than the width of the waist-shaped hole, and a limiting plate is formed at one end of the connecting column passing through the waist-shaped hole, the diameter of the limiting plate is larger than the width of the waist-shaped hole and smaller than the width of the waist-shaped groove, and a positioning hole that passes through the connecting column and the positioning block is formed in the middle part of the connecting column.

[0012] By adopting the above technical solution, a waist-shaped groove and a waist-shaped hole are formed on the femoral fixation plate. After the connecting column connected to the positioning block passes through the waist-shaped hole, the limiting plate connected to the other end of the connecting column is located in the waist-shaped groove to cooperate with the limiting positioning block so that it will not be separated from the femoral fixation plate. Since the diameter of the connecting column is smaller than the width of the waist-shaped hole, and the diameter of the limiting plate is larger than the width of the waist-shaped hole and smaller than the width of the waist-shaped groove, after the femoral fixation plate is fixed on the femur, the position of the positioning block can still be adjusted along the length and width direction of the waist-shaped hole. When the detected knee joint pressure value is within the appropriate range, a hole is drilled at the position of the corresponding positioning hole on the femur by a drilling rig. Since there is no need for repeated bone repair and drilling, the use of this balancing device can reduce damage to the femur.

[0013] In a preferred example, the present invention can be further configured as follows: two through holes are formed on the femoral fixation plate, a first avoidance hole is formed at the position corresponding to the through hole on the positioning block, the thickness of the limiting plate is equal to or greater than the depth of the waist groove, and the screw passes through the through hole after passing through the first avoidance hole.

[0014] By adopting the above technical solution, a perforation is set on the femoral fixation plate so that the screw passes through the first avoidance hole and then through the perforation, thereby connecting the femoral fixation plate and the femur together. Since the thickness of the limiting plate is equal to or greater than the depth of the waist groove, when the screw is tightened, the limiting plate will also be pressed against the femur to fix the position of the positioning block. This avoids the position of the positioning block changing during the drilling process, resulting in inaccurate drilling position.

[0015] In a preferred example, the present invention can be further configured as follows: a connecting block is formed on the side of the femoral fixation plate facing the positioning block near both ends, and holes are formed through the corresponding connecting blocks and the femoral fixation plate.

[0016] By adopting the above technical solution, a connecting block is provided and a perforation is opened on the connecting block, so that the perforation position has better strength.

[0017] In a preferred example, the present invention can be further configured as: it also includes two adjustment gaskets located between the femoral fixation plate and the adjustment positioning assembly, the positioning block includes a standing abutment portion and a bent leg abutment portion, the left and right ends of the standing abutment portion facing the femoral fixation plate are each formed with a track groove extending in the up and down directions, the track groove extends to the bent leg abutment portion, and the upper surface of the bent leg abutment portion and the bottom surface of the track groove have a smooth transition, the adjustment gasket is made of a material with plastic deformation ability, the adjustment gasket includes a guide piece located in the track groove and a supporting adjustment piece integrally formed at the lower end of the guide piece, the upper end surface of the standing abutment portion is formed with a threaded hole connected to the track groove, the adjustment bolt threadedly connected to the threaded hole is inserted into the track groove from top to bottom, and the end of the adjustment bolt extending into the track groove is rotatably connected to the adjustment gasket.

[0018] By adopting the above technical solution, the adjusting bolt is rotated to drive the adjusting gasket to move up and down. Since the adjusting gasket has a certain plastic deformation ability, when the guide piece moves downward to the transition connection position between the standing abutment part and the bent leg abutment part, the guide piece is deformed, so that the supporting adjusting piece is tilted up to abut the femur, changing the distance between the femur and the bent leg abutment part, and realizing the adjustment of the distance between the bent leg abutment part of the positioning block and the femur, as well as the matching angle between the positioning block and the femur.

[0019] In a preferred example, the present invention can be further configured as follows: two columns are formed on one end of the guide plate facing the standing abutment portion, and two locking plates are threadedly connected to one end of the adjusting bolt extending into the track groove, and the two locking plates are respectively located on the upper and lower sides of the column.

[0020] By adopting the above technical solution, two locking plates are connected to the adjusting bolt to hold the upper and lower sides of the column, so that the adjusting gasket can be driven to move together when the position of the adjusting bolt changes.

[0021] In a preferred example, the present invention can be further configured as follows: an annular groove is formed at the lower end of the adjusting bolt, and two cylinders are formed at the end of the guide plate facing the standing abutment portion, the two cylinders are arc-shaped and inserted into the annular groove, and the radius of the arc surfaces facing each other of the two cylinders is equal to the radius of the bottom surface of the annular groove, and the distance between the two cylinders away from one end of the adjusting gasket is slightly smaller than the diameter of the bottom surface of the annular groove.

[0022] By adopting the above technical solution, an annular groove is formed at the lower end of the adjusting bolt so that the column on the guide plate is stuck in the annular groove in a semi-enclosed form, so that the adjusting gasket can be driven to move together when the position of the adjusting bolt changes.

[0023] In a preferred example, the present invention can be further configured as follows: a guide protrusion is formed on the bottom surface of the track groove, and a guide hole with a width equal to that of the guide protrusion is formed in the middle of the guide sheet.

[0024] By adopting the above technical solution, the moving direction of the adjusting gasket is limited by the cooperation of the guide protrusion and the guide hole, so that the adjusting gasket moves along the set track direction.

[0025] In a preferred example, the present invention can be further configured as follows: an abutment protrusion is formed on the side of the femoral fixation plate facing the standing abutment portion, and a square groove is formed on the side of the standing abutment portion facing the femoral fixation plate, the abutment protrusion is inserted into the square groove, and a spring is provided in the square groove to abut the upper surface of the abutment protrusion.

[0026] By adopting the above technical solution, the abutment protrusion formed on the femoral fixation plate is inserted into the square groove, and the abutment protrusion is pressed against the spring to apply force, so that the support adjustment plate can always be pressed against the side of the femur without being separated from the femur.

[0027] In a preferred example, the present invention can be further configured as follows: a socket connected to the square groove is formed on the surface of the standing abutment portion at a position above the square groove, the width of the socket is greater than the width of the square groove, and the upper end of the spring is fixedly connected with a plug inserted into the socket.

[0028] By adopting the above technical solution, the spring is connected to the inserting piece and inserted into the inserting hole, so that the spring can be installed in the square groove more conveniently.

[0029] The second object of the present invention is achieved through the following technical solutions:

[0030] A method for using a soft tissue balancing device in knee replacement surgery, comprising:

[0031] S1. Place the balancing device

[0032] The femoral fixation plate is attached to the cut end surface of the femur, and the support adjustment plate is abutted against the side surface of the femur;

[0033] S2. Connect the balancing device to the femur

[0034] Insert the screws through the holes on the femoral fixation plate into the femur to connect the balancing device to the femur;

[0035] S3. Adjust the position of the positioning block

[0036] By rotating the adjusting bolt, the adjusting gasket is driven to move up and down; when the originally straight part of the adjusting gasket moves downward to the transition connection position between the standing abutment part and the bent leg abutment part, the adjusting gasket is deformed, the supporting adjusting plate is tilted up to abut against the femur, and the distance between the bent leg abutment part of the positioning block and the femur, as well as the matching angle between the positioning block and the femur, is adjusted;

[0037] S4. Detect knee joint pressure

[0038] Detect knee joint pressure through electronic pressure test pad;

[0039] S5, locking positioning block

[0040] When the test result of the electronic pressure test pad shows that the knee joint pressure has not reached the appropriate value, repeat S3 and S4 until the knee joint pressure reaches the appropriate range for the human body; then tighten the screw to fix the position of the positioning block;

[0041] S6. Drilling

[0042] Use a drill to drill holes on the femur at positions corresponding to the positioning holes;

[0043] S7. Remove the balancing device.

[0044] By adopting the above technical solution, the position of the positioning block is adjusted so that the knee joint pressure value is within the appropriate range when the positioning block is in this position, and then a hole is drilled on the femur at the position opposite to the positioning hole. The prosthesis is installed and fixed through the drilled hole, so that the knee joint pressure value is within the appropriate range after the operation.

[0045] In summary, the present invention includes at least one of the following beneficial technical effects:

[0046] 1. After the femoral fixation plate is fixed on the femur, the position of the positioning block can still be adjusted along the length and width direction of the waist-shaped hole. When the detected knee joint pressure value is within the appropriate range, a hole is drilled at the position of the corresponding positioning hole on the femur through a drill. Since repeated bone repair and drilling are not required, the use of this balancing device can reduce damage to the femur;

[0047] 2. When the screw is tightened, the limit plate will also be pressed against the femur to fix the position of the positioning block, thereby avoiding changes in the position of the positioning block during the drilling process and causing inaccurate drilling positions. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 is a front view of the first embodiment;

[0049] Figure 2 is an exploded schematic diagram of the first embodiment;

[0050] Figure 3 is a schematic structural diagram of the femoral fixation plate in the first embodiment;

[0051] Figure 4 is a structural schematic diagram of the adjustment and positioning assembly in the first embodiment;

[0052] Figure 5 is a schematic structural diagram of the adjusting gasket in the first embodiment;

[0053] Figure 6 is a schematic diagram of the structure of the adjusting gasket and the adjusting bolt in the second embodiment;

[0054] Figure 7 is a schematic diagram of the structure of the balancing device when adjusting the position of the positioning block in the third embodiment;

[0055] Figure 8 It is a structural schematic diagram of the coordination between the balancing device and the femur when adjusting the position of the positioning block in the third embodiment.

[0056] 1. Femoral fixation plate; 2. Adjustment and positioning assembly; 3. Adjustment gasket; 4. Waist-shaped groove; 5. Waist-shaped hole; 6. Connecting block; 7. Through hole; 8. Abutment protrusion; 9. Positioning block; 10. Connecting column; 11. Standing abutment portion; 12. Bend-leg abutment portion; 13. Limiting plate; 14. Positioning hole; 15. First avoidance hole; 16. Track groove; 17. Guide protrusion; 18. Threaded hole; 19. Square groove; 20. Plug hole; 21. Insert plate; 22. Spring; 23. Guide plate; 24. Support adjustment plate; 25. Guide hole; 26. Second avoidance hole; 27. Column; 28. Locking plate; 29. ​​Annular groove; 30. Screw; 31. Adjustment bolt. DETAILED DESCRIPTION

[0057] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0058] Embodiment 1:

[0059] like Figure 1 and Figure 2 As shown, a soft tissue balancing device in knee replacement surgery includes a femoral fixation plate 1 that fits the femur, an adjustment positioning component 2 for locating a drilling position, and two adjustment gaskets 3 located between the femoral fixation plate 1 and the adjustment positioning component 2. Figure 1 The schematic diagram of the balance device is shown from the perspective of the knee joint from the sole side of a person lying flat. Figure 1The up, down, left, and right directions of the central balancing device are the up, down, left, and right directions in the full text, with the side facing the reader in the figure as the front in the description.

[0060] like Figure 2 and Figure 3 As shown, the femoral fixation plate 1 is plate-shaped, and the back of the femoral fixation plate 1 near the left and right ends is formed with a waist-shaped groove 4, and the length direction of the waist-shaped groove 4 is along the up-down direction. The bottom surface of the waist-shaped groove 4 is formed with a waist-shaped hole 5 that passes through the femoral fixation plate 1, and the size of the waist-shaped hole 5 is smaller than the size of the waist-shaped groove 4, and the length direction of the waist-shaped hole 5 is consistent with the length direction of the waist-shaped groove 4. A connecting block 6 is formed on the front of the femoral fixation plate 1 near the left and right ends, and the front side of each connecting block 6 is formed with a through hole 7 that passes through the connecting block 6 and the femoral fixation plate 1, and the through hole 7 is obliquely oriented from front to back toward the center of the femoral fixation plate 1. A rectangular abutment convex block 8 is formed in the middle of the front of the femoral fixation plate 1.

[0061] like Figure 2 and Figure 4 As shown, the adjustment and positioning assembly 2 includes a positioning block 9 with a bionic shape (imitating the shape of the femur connecting the tibia end) and two connecting columns 10 connecting the positioning block 9 and the femoral fixation plate 1, and the diameter of the connecting column 10 is smaller than the width of the waist-shaped hole 5. The positioning block 9 includes a standing abutment portion 11 that cooperates with the tibia when the leg is straight and a bent leg abutment portion 12 that cooperates with the tibia when the leg is bent, wherein the bent leg abutment portion 12 is integrally formed at the lower end of the standing abutment portion 11 and extends backward, and the connection between the connecting column 10 and the positioning block 9 is the back of the standing abutment portion 11. A limiting plate 13 is formed on the outer side of one end of the connecting column 10 passing through the waist-shaped hole 5, and the thickness of the limiting plate 13 is equal to or slightly greater than the depth of the waist-shaped groove 4, and the diameter of the limiting plate 13 is greater than the width of the waist-shaped hole 5 and less than the width of the waist-shaped groove 4. A positioning hole 14 is formed in the middle of the connecting column 10, which passes through the connecting column 10 and the standing abutment portion 11. A first avoidance hole 15 is formed on the back side of the standing abutment 11 near the left and right sides, and passes through the adjacent left and right side walls of the standing abutment 11. When the femoral fixation plate 1 and the adjustment and positioning assembly 2 are matched, the connecting block 6 is located in the first avoidance hole 15, and the screw 30 passes through the first avoidance hole 15 from the through side of the first avoidance hole 15 and passes through the through hole 7.

[0062] like Figure 4As shown, the back of the standing abutment 11 is formed with a track groove 16 extending in the up-down direction at the position where the two connecting columns 10 are connected. The track groove 16 extends to the bent leg abutment 12, and the upper surface of the bent leg abutment 12 and the bottom surface of the track groove 16 are smoothly transitioned. The bottom surface of the track groove 16 is formed with a guide protrusion 17 at a position below the connecting column 10. The upper end surface of the standing abutment 11 is formed with a threaded hole 18 connected to the track groove 16, and the adjusting bolt 31 threadedly connected with the threaded hole 18 is inserted into the track groove 16 from top to bottom. The middle part of the back of the standing abutment 11 is formed with a square groove 19, and the length direction of the square groove 19 is along the up-down direction. The back of the standing abutment 11 is formed with a plug hole 20 connected to the square groove 19 at a position above the square groove 19, and the width of the plug hole 20 is greater than the width of the square groove 19. An inserting piece 21 of matching size is inserted into the inserting hole 20 , and a spring 22 is connected to the lower end of the inserting piece 21 . After the abutting protrusion 8 is inserted into the square groove 19 , the upper surface of the abutting protrusion 8 abuts against the spring 22 .

[0063] like Figure 4 and Figure 5 As shown, the adjusting gasket 3 is made of plastic or other materials with certain plastic deformation ability, and the adjusting gasket 3 includes a guide piece 23 located in the track groove 16 and a supporting adjusting piece 24 integrally formed at the lower end of the guide piece 23. The width of the guide piece 23 is equal to the width of the track groove 16, and a guide hole 25 with a width equal to the width of the guide protrusion 17 is formed in the middle of the guide piece 23, and the length of the guide hole 25 is greater than the length of the guide protrusion 17. A second avoidance hole 26 is formed at a position above the guide hole 25 on the guide piece 23, and the size of the second avoidance hole 26 is greater than the size of the connecting column 10. Two columns 27 are integrally formed near the upper end of the front side of each guide piece 23, and the two columns 27 are inserted into the two sides of the corresponding adjusting bolt 31, and the positions on the upper and lower sides of the column 27 on the adjusting bolt 31 are threadedly connected with locking pieces 28 for clamping the column 27.

[0064] Embodiment 2:

[0065] like Figure 6 As shown, a soft tissue balancing device in knee replacement surgery is different from the first embodiment in that an annular groove 29 is formed at the lower end of the adjusting bolt 31. Two columns 27 are inserted into the annular groove 29 in an arc shape, and the radius of the arc surface of the two columns 27 facing each other is equal to the radius of the bottom surface of the annular groove 29. The distance between the two columns 27 away from one end of the adjusting gasket 3 is slightly smaller than the diameter of the bottom surface of the annular groove 29.

[0066] Embodiment three:

[0067] A method for using a soft tissue balancing device in knee replacement surgery, comprising:

[0068] S1. Place the balancing device

[0069] The femoral fixation plate 1 is attached to the cut end surface of the femur, and the support adjustment plate 24 is in contact with the side surface of the femur.

[0070] S2. Connect the balancing device to the femur

[0071] The screw 30 is inserted into the femur through the through hole 7 on the femoral fixation plate 1 to connect the balancing device and the femur.

[0072] S3. Adjust the position of the positioning block 9

[0073] like Figure 7 and Figure 8 As shown, by rotating the adjusting bolt 31, the adjusting pad 3 is driven to move up and down. Since the adjusting pad 3 has a certain plastic deformation ability, when the originally straight part of the adjusting pad 3 moves downward to the transition connection position between the standing abutment part 11 and the bent leg abutment part 12, the adjusting pad 3 is deformed, and the supporting adjusting piece 24 is tilted up to abut against the femur, thereby adjusting the distance between the bent leg abutment part 12 of the positioning block 9 and the femur, as well as the matching angle between the positioning block 9 and the femur.

[0074] S4. Detect knee joint pressure

[0075] The knee joint pressure is detected by an electronic pressure pad.

[0076] S5, locking positioning block 9

[0077] When the test result of the electronic pressure test pad shows that the knee joint pressure has not reached the appropriate value, S3 and S4 are repeated until the knee joint pressure reaches a range suitable for the human body. Then the screw 30 is tightened to fix the position of the positioning block 9.

[0078] S6. Drilling

[0079] Use a drill to drill holes on the femur at positions corresponding to the positioning holes 14 .

[0080] S7. Remove the balancing device.

[0081] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A soft tissue balancing device for knee replacement surgery, characterized by: The invention comprises a femoral fixation plate (1) and an adjustment and positioning assembly (2), wherein the surface of the femoral fixation plate (1) is formed with a waist-shaped groove (4), the bottom surface of each waist-shaped groove (4) is formed with a waist-shaped hole (5) whose size is smaller than the waist-shaped groove (4), the length direction of the waist-shaped hole (5) is consistent with the length direction of the waist-shaped groove (4), and the adjustment and positioning assembly (2) comprises a positioning block (9) with a bionic appearance and a connecting column (10) connected to the positioning block (9), the diameter of the connecting column (10) is smaller than the width of the waist-shaped hole (5), and one end of the connecting column (10) passing through the waist-shaped hole (5) is formed with a limited The positioning plate (13) has a diameter greater than the width of the waist-shaped hole (5) and less than the width of the waist-shaped groove (4); a positioning hole (14) penetrating the connecting column (10) and the positioning block (9) is formed in the middle of the connecting column (10); and two adjustment gaskets (3) are located between the femoral fixing plate (1) and the adjustment positioning assembly (2); the positioning block (9) includes a standing abutment portion (11) and a bent leg abutment portion (12); the standing abutment portion (11) is formed with a track groove extending in the up-down direction at the left and right ends facing the femoral fixing plate (1). (16), the track groove (16) extends to the bent leg abutment portion (12), and the upper surface of the bent leg abutment portion (12) and the bottom surface of the track groove (16) are smoothly transitioned, the adjusting gasket (3) is made of a material having plastic deformation ability, the adjusting gasket (3) includes a guide piece (23) located in the track groove (16) and a supporting adjusting piece (24) integrally formed at the lower end of the guide piece (23), the upper end surface of the standing abutment portion (11) is formed with a threaded hole (18) connected to the track groove (16), and an adjusting bolt threadedly connected to the threaded hole (18) is provided. (31) is inserted into the track groove (16) from top to bottom, and one end of the adjusting bolt (31) extending into the track groove (16) is rotatably connected to the adjusting gasket (3). Since the adjusting gasket (3) has a certain plastic deformation ability, when the originally straight part of the adjusting gasket (3) moves downward to the transition connection position between the standing abutment part (11) and the bent leg abutment part (12), the adjusting gasket (3) is deformed, and the supporting adjusting plate (24) is tilted up to abut the femur, thereby adjusting the distance between the bent leg abutment part (12) of the positioning block (9) and the femur, as well as the matching angle between the positioning block (9) and the femur.

2. The soft tissue balancing device for knee replacement according to claim 1, characterized in that: The femoral fixation plate (1) is formed with two through holes (7), the positioning block (9) is formed with a first avoidance hole (15) at a position corresponding to the through hole (7), the thickness of the limiting plate (13) is equal to or greater than the depth of the waist groove (4), and the screw (30) passes through the through hole (7) after passing through the first avoidance hole (15).

3. The soft tissue balancing device for knee replacement according to claim 2, characterized in that: A connecting block (6) is formed on each side of the femoral fixing plate (1) facing the positioning block (9) and close to both ends, and a perforation (7) passes through the corresponding connecting block (6) and the femoral fixing plate (1).

4. The soft tissue balancing device for knee replacement according to claim 1, characterized in that: Two columns (27) are formed on one end of the guide piece (23) facing the standing abutment portion (11), and two locking pieces (28) are threadedly connected to one end of the adjusting bolt (31) extending into the track groove (16), and the two locking pieces (28) are respectively located on the upper and lower sides of the column (27).

5. The soft tissue balancing device for knee replacement according to claim 1, characterized in that: The lower end of the adjusting bolt (31) is formed with an annular groove (29), and the end of the guide piece (23) facing the standing abutment portion (11) is formed with two columns (27), the two columns (27) are arc-shaped and inserted into the annular groove (29), and the radius of the arc surfaces facing each other of the two columns (27) is equal to the radius of the bottom surface of the annular groove (29), and the distance between the two columns (27) away from one end of the adjusting gasket (3) is slightly smaller than the diameter of the bottom surface of the annular groove (29).

6. The soft tissue balancing device for knee replacement according to claim 5, characterized in that: A guide protrusion (17) is formed on the bottom surface of the track groove (16), and a guide hole (25) having a width equal to that of the guide protrusion (17) is formed in the middle of the guide piece (23).

7. The soft tissue balancing device for knee replacement according to claim 1, characterized in that: The femoral fixation plate (1) is formed with an abutment protrusion (8) on the side facing the standing abutment portion (11), and the standing abutment portion (11) is formed with a square groove (19) on the side facing the femoral fixation plate (1), the abutment protrusion (8) is inserted into the square groove (19), and a spring (22) is provided in the square groove (19) for abutting against the upper surface of the abutment protrusion (8).

8. The soft tissue balancing device for knee replacement according to claim 7, characterized in that: A plug hole (20) connected to the square groove (19) is formed on the surface of the standing abutment portion (11) at a position above the square groove (19); the width of the plug hole (20) is greater than the width of the square groove (19); and an insert sheet (21) inserted into the plug hole (20) is fixedly connected to the upper end of the spring (22).

Images