Multifunctional device for adjusting osteotomy of tibial side in knee arthroplasty

Abstract

The application discloses a multifunctional device for adjusting bone cutting of a tibial side in knee replacement, which comprises a reference plate and a bone cutting guide plate. The bone cutting guide plate is provided with a bone cutting groove and a plurality of fixing pin holes below the bone cutting groove. The bone cutting groove is parallel to the bottom surface of the reference plate. A plurality of forward and backward inclination adjusting holes are formed in the reference plate. A forward and backward inclination adjusting rotating column is mounted in each forward and backward inclination adjusting hole. The length of the forward and backward inclination adjusting rotating column protruding from the reference plate is adjusted to adjust the included angle between the bone cutting groove and a bone cutting plane in the sagittal plane during bone cutting. A plurality of internal and external rotation adjusting holes are formed in the reference plate. An internal and external rotation adjusting rotating column is mounted in each internal and external rotation adjusting hole. The length of the internal and external rotation adjusting rotating column protruding from the reference plate is adjusted to adjust the included angle between the bone cutting groove and a bone cutting plane in the coronal plane during bone cutting. The device can not only adjust the bone cutting amount, but also adjust the bone cutting angle after the tibial bone cutting is completed, so that the bone cutting adjustment is more convenient, fast and accurate.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a multifunctional device for tibial side adjustment osteotomy in knee replacement surgery. Background Technology

[0002] Osteotomy is a major step in knee replacement surgery. Osteotomy aims to create space to accommodate the prosthesis, a neutral force line, balanced flexion-extension distance, and balanced soft tissue. This requires not only precision but may also necessitate adjustments based on the patient's condition. For example, insufficient osteotomy at the tibial fixation screw holes or incorrect osteotomy angles necessitate adjustments to the tibial fixation screw holes. However, current traditional surgical tools typically cannot provide quick and effective adjustments.

[0003] Currently, the methods used to adjust the osteotomy of the tibial fixation screw holes are as follows: 1. If it is necessary to increase the amount of osteotomy in the tibial fixation screw holes, and the fixation screws of the previous osteotomy guide plate have not been removed, osteotomy can be performed again through the +2mm screw holes on the osteotomy plate. 2. If the fixation screws have been removed, there is no reliable method for supplementary osteotomy; manual adjustment depends on the surgeon's experience, accuracy, and stability, and is not suitable for most surgeons. 3. There is currently no suitable method for adjusting the varus / valgus and posterior tilt angles; it can only be manually adjusted based on the surgeon's experience, and there are no reliable tools. Summary of the Invention

[0004] To address the aforementioned issues, this application provides a multifunctional device for tibial side adjustment osteotomy in knee replacement surgery.

[0005] The technical solution adopted by this invention to solve its technical problem is as follows:

[0006] This application provides a multifunctional device for tibial osteotomy adjustment in knee replacement surgery, including an integrally formed reference plate and an osteotomy guide plate. The bottom surface of the reference plate is in contact with the pre-formed osteotomy plane to serve as a reference plane during osteotomy. The bottom surface of the osteotomy guide plate protrudes downward from the bottom surface of the reference plate. The protruding portion of the osteotomy guide plate has an osteotomy groove and several fixing pin holes located below the osteotomy groove. The osteotomy groove is parallel to the bottom surface of the reference plate. The reference plate has several tilt adjustment holes, and each tilt adjustment hole is fitted with a tilt adjustment column. By adjusting the length of the tilt adjustment column protruding from the reference plate, the angle between the osteotomy groove and the osteotomy plane in the sagittal plane during osteotomy can be adjusted. The reference plate also has several valgus adjustment holes, and each valgus adjustment hole is fitted with a valgus adjustment column. By adjusting the length of the valgus adjustment column protruding from the reference plate, the angle between the osteotomy groove and the osteotomy plane in the coronal plane during osteotomy can be adjusted.

[0007] As an improvement to the above solution, the number of tilt adjustment holes is two, which are symmetrically opened on the longitudinal center line of the reference plate.

[0008] As an improvement to the above solution, the number of inward and outward adjustment holes is two, which are symmetrically opened on the transverse center line of the reference plate.

[0009] As an improvement to the above solution, grooves are vertically provided on the inner walls of the inversion / exversion adjustment holes and the tilt adjustment holes. When the inversion / exversion / tilt adjustment column rotates half a turn or one turn, a corresponding rotation alignment mark is marked in the groove. The angle between the osteotomy groove and the osteotomy plane in the sagittal / coronal plane is increased by 1° accordingly.

[0010] As an improvement to the above solution, the fixing pin holes are located on both sides of the longitudinal center line of the reference plate, and fixing pins are installed inside them.

[0011] As an improvement to the above scheme, the number of fixing nail holes on each side of the longitudinal centerline of the reference plate is at least one.

[0012] As an improvement to the above solution, the osteotomy guide plate is located at the front end of the reference plate, slightly to the right, and is used for osteotomy of the medial side of the right knee.

[0013] As an improvement to the above solution, the osteotomy guide plate is located at the front left of the reference plate and is used for medial osteotomy of the left knee.

[0014] As an improvement to the above solution, the osteotomy plate body is made of metal or polymer material.

[0015] This application also provides a method for tibial lateral adjustment osteotomy in knee replacement surgery, which is applied in any of the above-mentioned multifunctional devices for tibial lateral adjustment osteotomy in knee replacement surgery, the method comprising:

[0016] When performing a parallel osteotomy, the following steps are included:

[0017] (2) Place the bottom surface of the reference plate against the osteotomy plane to be osteotomized;

[0018] (2) Using fixation pins, drill into the bone fixation osteotomy plate body through the fixation pin holes, and perform osteotomy in the osteotomy groove to increase the parallel osteotomy plane;

[0019] Anterior-posterior tilt osteotomy includes the following steps:

[0020] (1) Place the bottom surface of the reference plate against the osteotomy plane to be osteotomized;

[0021] (2) Adjust the tilting adjustment column to make it protrude from the bottom surface of the reference plate. At this time, the bottom surface of the reference plate forms an angle with the osteotomy plane to be osteotomized, that is, the osteotomy groove and the osteotomy plane to be osteotomized are at a certain angle in the sagittal plane.

[0022] (3) Using fixation pins, drill the bone fixation osteotomy plate body into the fixation pin holes, and perform osteotomy in the osteotomy groove to adjust the anterior and posterior tilt of the osteotomy plane;

[0023] When performing an inverted or varus osteotomy, the following steps are included:

[0024] (1) Place the bottom surface of the reference plate against the osteotomy plane to be osteotomized;

[0025] (2) Adjust the inward / outward adjustment column so that it protrudes from the bottom surface of the reference plate. At this time, the bottom surface of the reference plate forms an angle with the osteotomy plane to be osteotomized, that is, the osteotomy groove and the osteotomy plane to be osteotomized are at a certain angle in the coronal plane.

[0026] (3) Using fixation pins, drill into the bone fixation osteotomy plate body through the fixation pin holes, and perform osteotomy in the osteotomy groove to adjust the inward / outward rotation of the osteotomy plane.

[0027] The beneficial effects of this invention are as follows:

[0028] In knee replacement surgery, this application provides a reliable and accurate method for adjusting the tibial osteotomy after it has been completed. It can not only adjust the amount of osteotomy but also the osteotomy angle, making it more convenient, faster, and more accurate to adjust the force lines and balance in the coronal and sagittal planes. Attached Figure Description

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0030] Appendix Figure 1 This is a top view of the multifunctional device for tibial side adjustment osteotomy in knee replacement surgery according to this application;

[0031] Appendix Figure 2 This is a front view of the multifunctional device for tibial side adjustment osteotomy in knee replacement surgery according to this application;

[0032] Appendix Figure 3 This is a right view of the multifunctional device for tibial side adjustment osteotomy in knee replacement surgery according to this application.

[0033] In the diagram: 1: Reference plate; 11, 12: Anterior and posterior tilt adjustment holes; 13, 14: Inversion and valgus adjustment holes; 2: Osteotomy guide plate; 21: Osteotomy groove; 22: Fixation pin hole. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be understood that the terms "upper side", "lower side", "upper end", "both ends", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the multifunctional device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] In this invention, unless otherwise explicitly specified and limited, the terms "set up," "install," "connect," "link," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] Example 1

[0038] Reference Figure 1-3A multifunctional device for tibial osteotomy adjustment in knee replacement surgery includes an integrally molded reference plate 1 and osteotomy guide plate 2 made of metal or polymer material. The bottom surface of the reference plate 1 is aligned with the pre-formed osteotomy plane to serve as a reference plane for osteotomy. The bottom surface of the osteotomy guide plate 2 protrudes downward from the bottom surface of the reference plate 1. The protruding part of the osteotomy guide plate 2 has an osteotomy groove 21 and two fixing pin holes 22 located below the osteotomy groove 21. The osteotomy groove 21 is used for the osteotomy saw to perform osteotomy through the osteotomy groove 21. The thickness of the osteotomy saw is 1.27 mm. The osteotomy groove 21 is parallel to the bottom surface of the reference plate 1. The vertical distance between the upper surface of the osteotomy groove 21 and the bottom surface of the reference plate 1 is 0.73 mm, which can remove 2 mm of bone. The vertical distance between the upper surface of the osteotomy groove 21 and the bottom surface of the reference plate 1 can be changed according to the required thickness of bone to be removed in one operation. Two fixation pin holes 22 are located on both sides of the longitudinal (anteroposterior) centerline of the reference plate 1, with internal threads connecting fixation pins. These pins are inserted into the bone to fix the osteotomy guide plate 2. Two tilt adjustment holes 11 and 12 are symmetrically located on the longitudinal centerline of the reference plate 1. Each tilt adjustment hole is internally connected to a tilt adjustment pivot. Adjusting the length of the tilt adjustment pivot protruding from the reference plate 1 adjusts the angle between the osteotomy groove 21 and the osteotomy plane in the sagittal plane during osteotomy. Two inversion / valgus adjustment holes 13 and 14 are symmetrically located on the transverse (left-right) centerline of the reference plate 1. Each inversion / valgus adjustment hole contains an inversion / valgus adjustment pivot. Adjusting the length of the inversion / valgus adjustment pivot protruding from the reference plate 1 adjusts the angle between the osteotomy groove 21 and the osteotomy plane in the coronal plane during osteotomy.

[0039] The distance between the tilt adjustment holes 11 / 12 and the front / rear side of the reference plate 1 that is farthest from it (the distance between the tilt adjustment hole 11 and the front side of the reference plate 1, or the distance between the tilt adjustment hole 12 and the rear side of the reference plate 1) is set as a. The rotation pitch of the tilt adjustment screw is equal to sin1°×a×2. Grooves are vertically provided on the inner walls of the tilt adjustment holes 11 and 12. When the tilt adjustment screw rotates half a turn, a rotation alignment mark is marked in the groove of the tilt adjustment holes 11 and 12. Then the angle between the osteotomy groove 21 and the osteotomy plane in the sagittal plane increases by 1° accordingly. The distance between the hole of the inversion / outversion adjustment hole 13 / 14 and the side of the reference plate 1 that is farther away from it is set as b. The rotation pitch of the inversion / outversion adjustment screw is equal to sin1°×b. Grooves are vertically opened on the inner walls of the inversion / outversion adjustment holes 13 and 14. When the inversion / outversion adjustment screw rotates once, a rotation alignment mark is marked in the groove of the inversion / outversion adjustment hole 13 and 14. Then the angle between the osteotomy groove 21 and the osteotomy plane on the coronal plane increases by 1° accordingly.

[0040] The osteotomy guide plate 2 is located at the front end of the reference plate 1, slightly to the right, and is used for osteotomy of the medial side of the right knee to avoid damage to the patellar tendon and soft tissues on the lateral side of the knee joint; similarly, the osteotomy guide plate 2 can also be located at the front end of the reference plate 1, slightly to the left, and is used for osteotomy of the medial side of the left knee.

[0041] Example 2

[0042] This application also provides a method for tibial side adjustment osteotomy in knee replacement surgery, which is applied in the multifunctional device for tibial side adjustment osteotomy in knee replacement surgery described in Embodiment 1 above. The method includes:

[0043] When performing a parallel osteotomy, the following steps are included:

[0044] (3) Place the bottom surface of reference plate 1 against the osteotomy plane to be cut;

[0045] (2) Using fixation pins, drill into the bone fixation osteotomy plate body through fixation pin holes 22, and perform osteotomy in osteotomy groove 21 to increase the parallel osteotomy of the osteotomy plane;

[0046] Anterior-posterior tilt osteotomy includes the following steps:

[0047] (1) Place the bottom surface of reference plate 1 against the osteotomy plane to be cut;

[0048] (2) Adjust the tilt adjustment pin in the tilt adjustment hole 11 / 12 so that it protrudes from the bottom surface of the reference plate 1. At this time, the bottom surface of the reference plate 1 forms an angle with the osteotomy plane to be osteotomized, that is, the osteotomy groove 21 and the osteotomy plane to be osteotomized are at a certain angle in the sagittal plane.

[0049] (3) Using fixation pins, drill into the bone fixation osteotomy plate body through the fixation pin hole 22, and perform osteotomy in the osteotomy groove 21 to adjust the anterior and posterior tilt of the osteotomy plane;

[0050] When performing an inverted or varus osteotomy, the following steps are included:

[0051] (1) Place the bottom surface of reference plate 1 against the osteotomy plane to be cut;

[0052] (2) Adjust the inversion and eversion adjustment pin in the inversion and eversion adjustment hole 13 / 14 so that it protrudes from the bottom surface of the reference plate 1. At this time, the bottom surface of the reference plate 1 forms an angle with the osteotomy plane to be osteotomized, that is, the osteotomy groove 21 and the osteotomy plane to be osteotomized are at a certain angle in the coronal plane.

[0053] (3) Using fixation pins, drill into the bone fixation osteotomy plate body through the fixation pin hole 22, and perform osteotomy in the osteotomy groove 21 to adjust the inward and outward rotation of the osteotomy plane.

[0054] Application Examples

[0055] Scenario 1: When insufficient tibial osteotomy is found, the tibial osteotomy amount needs to be increased evenly without changing the osteotomy angle. In this case, it is a parallel osteotomy, and there is no need to adjust the tibial osteotomy angle. Place the anteroposterior tilt adjustment column and the varus / valgus adjustment column in their original positions (not protruding from the reference plate 1). The reference plate 1 is attached to the osteotomy surface of the tibial fixation pin hole 22. Using fixation pins, drill into the bone fixation osteotomy plate body through the fixation pin hole 22, and perform osteotomy within the osteotomy groove 21 to increase the tibial osteotomy amount.

[0056] Scenario 2: When adjusting tibial posterior tilt, if it is necessary to increase posterior tilt (reduce anteversion), the anteversion / anteversion adjustment pin in the anteversion / anteversion adjustment hole 12 is rotated out to protrude from the bottom surface of the reference plate 1. The number of rotations is determined by the required adjustment angle and can be determined by the alignment mark. Then, a fixation pin is drilled into the bone fixation osteotomy plate body through the fixation pin hole 22. The adjustment pin in the anteversion / anteversion adjustment hole 12 is then reset, and osteotomy is performed in the osteotomy groove 21 to increase the posterior tilt angle of the tibial osteotomy surface.

[0057] Scenario 3: When it is necessary to adjust the tibial posterior tilt, if it is necessary to increase the posterior tilt (decrease the anterior tilt), the anterior tilt adjustment pin in the anterior tilt adjustment hole 11 is rotated out to protrude from the bottom surface of the reference plate 1 for osteotomy. The remaining operation steps are the same as in Scenario 2.

[0058] Scenario 4: When it is necessary to adjust the tibial osteotomy varus / valgus angle, if it is necessary to increase varus, the varus / valgus adjustment pin in the varus / valgus adjustment hole 13 of the reference plate 1 is rotated out to protrude from the bottom surface of the reference plate 1 for osteotomy. The remaining operation steps are the same as in Scenario 2.

[0059] Scenario 4: When it is necessary to adjust the tibial osteotomy varus / valgus angle, if it is necessary to increase valgus, the varus / valgus adjustment pin in the varus / valgus adjustment hole 14 of the reference plate 1 is rotated out to protrude from the bottom surface of the reference plate 1 for osteotomy. The remaining operation steps are the same as in Scenario 2.

[0060] It should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multifunctional device for tibial side adjustment osteotomy in knee replacement surgery, characterized in that: The device includes an integrally molded reference plate and an osteotomy guide plate. The bottom surface of the reference plate is aligned with the pre-formed osteotomy plane to serve as a reference plane for osteotomy. The bottom surface of the osteotomy guide plate protrudes downward from the bottom surface of the reference plate. The protruding part of the osteotomy guide plate has an osteotomy groove and several fixing pin holes located below the osteotomy groove. An oscillating saw for osteotomy performs osteotomy through the osteotomy groove. The osteotomy groove is parallel to the bottom surface of the reference plate. The bone is quantitatively removed by the thickness of the oscillating saw and the vertical distance between the upper surface of the osteotomy groove and the bottom surface of the reference plate. The reference plate has several tilt adjustment holes, each containing a tilt adjustment column. Adjusting the length of the tilt adjustment column protruding from the reference plate adjusts the angle between the osteotomy groove and the osteotomy plane in the sagittal plane during osteotomy. The reference plate also has several inversion / valgus adjustment holes, each containing an inversion / valgus adjustment column. Adjusting the length of the inversion / valgus adjustment column protruding from the reference plate adjusts the angle between the osteotomy groove and the osteotomy plane in the coronal plane during osteotomy. The inner walls of the inversion / valgus adjustment holes and the tilt adjustment holes are marked with rotation alignment marks. Each preset number of rotations of the inversion / valgus adjustment column or the tilt adjustment column, aligned with the rotation alignment marks, increases the angle between the osteotomy groove and the osteotomy plane in the coronal or sagittal plane by a preset angle, achieving quantitative angle adjustment. The osteotomy guide plate is located at the front end of the reference plate, slightly to the right or left, and is used for osteotomy on the medial side of the right or left knee, respectively.

2. The multifunctional device for tibial side adjustment osteotomy in knee replacement surgery according to claim 1, characterized in that: The number of tilt adjustment holes is two, symmetrically arranged on the longitudinal center line of the reference plate.

3. The multifunctional device for tibial side adjustment osteotomy in knee replacement surgery according to claim 1, characterized in that: The number of inward and outward adjustment holes is two, symmetrically arranged on the transverse center line of the reference plate.

4. The multifunctional device for tibial side adjustment osteotomy in knee replacement surgery according to claim 1, characterized in that: The inner walls of the inward and outward tilting adjustment holes and the forward and backward tilting adjustment holes are all vertically grooved. For every half-turn rotation of the tilt adjustment column, a corresponding rotation alignment mark is marked in the groove of the tilt adjustment hole, and the angle between the osteotomy groove and the osteotomy plane in the sagittal plane increases by 1°. For every full-turn rotation of the valgus adjustment column, a corresponding rotation alignment mark is marked in the groove of the valgus adjustment hole, and the angle between the osteotomy groove and the osteotomy plane in the coronal plane increases by 1°.

5. The multifunctional device for tibial side adjustment osteotomy in knee replacement surgery according to claim 1, characterized in that: The fixing pin holes are located on both sides of the longitudinal center line of the reference plate, and fixing pins are installed inside them.

6. The multifunctional device for tibial side adjustment osteotomy in knee replacement surgery according to claim 5, characterized in that: The number of fixing pin holes on each side of the longitudinal centerline of the reference plate is at least one.

7. The multifunctional device for tibial osteotomy adjustment in knee replacement surgery according to claim 1, characterized in that: The reference plate and osteotomy guide plate are made of metal or polymer materials.

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