Multifunctional device for adjusting osteotomy of femoral side in knee arthroplasty

Abstract

The application discloses a multifunctional device for adjusting bone cutting of a femur side in knee replacement, which comprises a bone cutting plate body and a fixing device, the bone cutting plate body comprises a reference plate and a bone cutting guide plate, the bone cutting guide plate is provided with a bone cutting groove, the bone cutting groove is parallel to the bottom surface of the reference plate, a plurality of adjusting holes are formed in the reference plate, and an adjusting rotating column is matched and installed in each adjusting hole, the length of the adjusting rotating column protruding from the reference plate is adjusted to adjust the angle of the bone cutting groove and a bone cutting plane in a sagittal plane or a coronal plane during bone cutting. After the distal end of the femur is cut or five bone cutting planes are completed, the bone cutting amount can be adjusted, the bone cutting angle can be adjusted, and the bone cutting adjustment is more convenient, fast and accurate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a multifunctional device for adjusting the distal femur osteotomy in knee arthroplasty. BACKGROUND

[0002] Osteotomy is a major step in knee arthroplasty. It is necessary to obtain a gap for accommodating the prosthesis, a neutral force line, a balanced flexion-extension gap, and balanced soft tissue. Not only does it require a certain degree of accuracy, but it may also need to be adjusted according to the patient's condition. For example, when the distal femur osteotomy is insufficient, the osteotomy angle is incorrect, or because the patient's left and right diameters and anteroposterior diameters do not match, the appropriate size of the prosthesis cannot be used, and only a small prosthesis can be used, resulting in an unbalanced flexion-extension gap, the prosthesis needs to be placed in a slightly flexed position. However, using the current traditional surgical tools, it is usually not possible to quickly and effectively adjust them.

[0003] Currently, the methods used to adjust the distal femur osteotomy are as follows: 1. If the distal femur osteotomy needs to be increased, the fixed nail of the previous distal femur osteotomy guide plate has not been removed, and the +2mm nail hole on the osteotomy plate can be used for re-osteotomy. 2. If the fixed nail has been removed, there is no reliable method for supplementary osteotomy; if manually adjusted, it depends on the experience, accuracy and stability of the operator, and is not suitable for most doctors. 3. There is no suitable method for adjusting the varus and valgus angles of the distal femur, and only manual adjustment based on the experience of the operator is available, without any reliable tools. SUMMARY

[0004] To solve the above problems, the present application provides a multifunctional device for adjusting the distal femur osteotomy in knee arthroplasty to accurately adjust the distal femur osteotomy.

[0005] The technical scheme adopted by the present application to solve the technical problems is as follows:

[0006] The present application provides a multifunctional device for adjusting the distal femur osteotomy in knee arthroplasty, which comprises an osteotomy plate body and a fixing device for fixing the osteotomy plate body. The osteotomy plate body comprises an integrally formed reference plate and an osteotomy guide plate. The bottom surface of the reference plate is attached to the formed osteotomy plane 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 part of the osteotomy guide plate is provided with an osteotomy groove. The osteotomy groove is arranged in parallel with the bottom surface of the reference plate. A plurality of adjustment holes are formed in the reference plate. An adjustment rotating column is fitted and installed in each adjustment hole. The length of the adjustment rotating column protruding from the reference plate is adjusted to adjust the angle of the osteotomy groove and the osteotomy plane in the sagittal plane or coronal plane during osteotomy.

[0007] As an improvement of the above-mentioned scheme, the reference plate is a square.

[0008] As an improvement of the above-mentioned scheme, the number of the adjusting holes is four, and two of them are arranged on the diagonal lines of the four corners of the reference plate.

[0009] As an improvement of the above-mentioned scheme, when the adjusting knob is rotated by half a circle or one circle, the inner wall of the adjusting hole is marked with a rotation alignment mark corresponding to the angle between the osteotomy groove and the osteotomy plane in the sagittal / coronal plane.

[0010] As an improvement of the above-mentioned scheme, the fixing device comprises a plurality of fixing pin holes provided on both sides of the reference plate, which can be installed with fixing pins.

[0011] As an improvement of the above-mentioned scheme, the fixing device comprises a plurality of fixing handles provided on both sides of the reference plate, each of which is inclined upward towards the outside of the reference plate and is provided with a fixing pin hole through which a fixing pin can be installed.

[0012] As an improvement of the above-mentioned scheme, the number of fixing handles on each side of the reference plate is at least one.

[0013] As an improvement of the above-mentioned scheme, the osteotomy plate body is made of metal or high polymer material.

[0014] The application also provides a method for adjusting the osteotomy of the femoral side in knee arthroplasty, which can be applied to any of the above-mentioned multifunctional devices for adjusting the osteotomy of the femoral side in knee arthroplasty, and the method comprises the following steps:

[0015] When the osteotomy is parallel, the method comprises the following steps:

[0016] (2) The bottom surface of the reference plate is attached to the osteotomy plane to be cut;

[0017] (2) Hold the fixing handle and press the fixing osteotomy plate body, or use the fixing pin to drill into the bone to fix the fixing osteotomy plate body in the fixing pin hole, and cut the bone in the osteotomy groove to increase the parallel osteotomy of the osteotomy plane;

[0018] When the osteotomy is flexed, the method comprises the following steps:

[0019] (1) The bottom surface of the reference plate is attached to the osteotomy plane to be cut;

[0020] (2) Adjust the two adjusting knobs on one side of the front and rear sides to protrude from the bottom surface of the reference plate, so that the bottom surface of the reference plate forms an angle with the osteotomy plane to be cut, i.e. the osteotomy groove and the osteotomy plane to be cut form a certain angle in the sagittal plane;

[0021] (3) Use the fixing pin to drill into the bone to fix the fixing osteotomy plate body in the fixing pin hole, and cut the bone in the osteotomy groove to adjust the flexion of the osteotomy plane;

[0022] When the bone is cut in varus and valgus, the following steps are included:

[0023] (1) The bottom surface of the reference plate is attached to the bone cutting plane to be cut;

[0024] (2) Adjust the two adjustment columns on one of the medial and lateral sides to protrude from the bottom surface of the reference plate, at this time the bottom surface of the reference plate forms an angle with the bone cutting plane to be cut, that is, the bone cutting groove and the bone cutting plane to be cut form a certain angle in the coronal plane;

[0025] (3) Use the fixation nail to drill into the bone through the fixation nail hole to fix the bone cutting plate body, and cut the bone in the bone cutting groove to adjust the varus and valgus of the bone cutting plane.

[0026] The beneficial effects brought by the present application are:

[0027] The present application provides a reliable and accurate method for adjusting the distal femur osteotomy after the distal femur osteotomy or the five osteotomy planes of the femur have been completed in knee arthroplasty, which not only adjusts the amount of osteotomy, but also adjusts the angle of osteotomy, so as to adjust the flexion-extension gap balance, lower limb force line, medial-lateral balance, and is more convenient, fast and accurate. BRIEF DESCRIPTION OF DRAWINGS

[0028] The present application will be further described below in combination with the drawings and specific embodiments,

[0029] The accompanying drawings are: Fig. 1 is the top view of the multifunctional device for adjusting the osteotomy of the femur side in knee arthroplasty of the present application;

[0030] The accompanying drawings are: Fig. 2 is the front view of the multifunctional device for adjusting the osteotomy of the femur side in knee arthroplasty of the present application;

[0031] The accompanying drawings are: Fig. 3 is the right view of the multifunctional device for adjusting the osteotomy of the femur side in knee arthroplasty of the present application.

[0032] In the drawings: 1: reference plate; 11, 12, 13, 14: adjustment hole; 2: bone cutting guide plate; 21: bone cutting groove; 3: fixation handle; 31: fixation nail hole. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0034] In the description of the present application, it needs to 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" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the multifunctional device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0035] In the present application, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "linkage", "communication" and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection; can be mechanical connection; can be directly connected, can also be indirectly connected through intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] Embodiment 1

[0037] With reference to Figs. 1-3 A multifunctional device for adjusting the osteotomy of the femoral side of knee arthroplasty, comprising an osteotomy plate body and a fixing device for fixing the osteotomy plate body.

[0038] The above-mentioned osteotomy plate body comprises a reference plate 1 and an osteotomy guide plate 2 integrally formed of a metal material, and the bottom surface of the reference plate 1 is fitted with the formed osteotomy plane as the reference plane during osteotomy. The fixing device comprises two fixing handles 3 symmetrically arranged on both sides of the reference plate 1, each of which is inclined upward towards the outside of the reference plate 1, facilitating the staff to fix the osteotomy plate body by grasping the fixing handle 3 during osteotomy, and a fixing nail hole 31 for installing a fixing nail is provided through each fixing handle 3, and the fixing nail is driven into the bone to fix the osteotomy plate body.

[0039] The bottom surface of the above-mentioned osteotomy guide plate 2 protrudes downward from the bottom surface of the reference plate 1, and the protruding part of the osteotomy guide plate 2 is provided with an osteotomy groove 21, and a swing saw for osteotomy is used to perform osteotomy through the osteotomy groove 21, the thickness of the swing saw is 1.27 mm, the osteotomy groove 21 is arranged in parallel with the bottom surface of the reference plate 1, and 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, that is, 2 mm of bone can be removed; according to the thickness of the bone to be removed at one time, the vertical distance between the upper surface of the osteotomy groove 21 and the bottom surface of the reference plate 1 can be changed. The plane of the reference plate 1 is square, and four adjusting holes 11, 12, 13 and 14 are arranged on the opposite diagonal lines of the four corners of the reference plate 1, respectively, and an adjusting screw is threadedly connected in each adjusting hole, and by adjusting the two adjusting screws in each direction of the front, rear, inner and outer (front, rear, inner and outer of the human knee joint) of the reference plate 1 respectively, the adjusting screws protrude from the bottom surface of the reference plate 1 by a certain length to adjust the angle of the osteotomy groove 21 and the osteotomy plane in the sagittal plane or the coronal plane during osteotomy, and the corresponding flexion angle or the varus angle of the osteotomy plane is adjusted.

[0040] The vertical distance from the center of each adjusting screw to the farther edge of the reference plate 1 is a, and the rotation pitch of the adjusting screw is equal to sin1°×a×2, and when the adjusting screw rotates by half a circle, a corresponding rotation alignment mark is marked on the inner wall of the adjusting hole 11, 12, 13 or 14, and then the included angle between the osteotomy groove 21 and the osteotomy plane in the sagittal plane / coronal plane is increased by 1°.

[0041] Embodiment 2

[0042] The application also provides a method for adjusting osteotomy on the femoral side of knee arthroplasty, which is applied to the multifunctional device for adjusting osteotomy on the femoral side of knee arthroplasty in the above-mentioned embodiment 1, and the method comprises the following steps:

[0043] When parallel osteotomy is performed, the method comprises the following steps:

[0044] (1) The bottom surface of the reference plate 1 is attached to the osteotomy plane to be osteotomied;

[0045] (2) The fixed handle 3 is held, the fixed osteotomy plate body is pressed, or the fixed nail is drilled into the bone through the fixed nail hole 31 to fix the osteotomy plate body, and osteotomy is performed in the osteotomy groove 21 to increase the parallel osteotomy of the osteotomy plane;

[0046] When flexion osteotomy is performed, the method comprises the following steps:

[0047] (1) The bottom surface of the reference plate 1 is attached to the osteotomy plane to be osteotomied;

[0048] (2) Adjust the adjusting screw in the two adjusting holes 11, 12 / adjusting holes 13, 14 on the front side / rear side of the reference plate 1 to protrude 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 cut, that is, the osteotomy groove 21 forms an angle with the osteotomy plane to be cut in the sagittal plane;

[0049] (3) Use the fixing nail to drill into the bone to fix the osteotomy plate body in the fixing nail hole 31, and cut the bone in the osteotomy groove 21 to adjust the flexion of the osteotomy plane.

[0050] When cutting the bone in varus and valgus, the following steps are included:

[0051] (1) The bottom surface of the reference plate 1 is attached to the osteotomy plane to be cut;

[0052] (2) Adjust the adjusting screw in the two adjusting holes 11, 12 / adjusting holes 13, 14 on the front side / rear side of the reference plate 1 to protrude 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 cut, that is, the osteotomy groove 21 forms an angle with the osteotomy plane to be cut in the coronal plane;

[0053] (3) Use the fixing nail to drill into the bone to fix the osteotomy plate body in the fixing nail hole 31, and cut the bone in the osteotomy groove 21 to adjust the varus and valgus of the osteotomy plane.

[0054] Application Example

[0055] Case 1: When the distal femur osteotomy balances the straight gap, according to the amount of femoral osteotomy and the size of the straight gap, it is judged that the distal femur osteotomy is insufficient, and the device can be used to increase the distal femur osteotomy, at this time, it is parallel osteotomy, and the angle of femoral osteotomy does not need to be adjusted. The flexion adjusting screw and the varus and valgus adjusting screw are in the original position (not protruding from the reference plate 1), the reference plate 1 is attached to the distal femur osteotomy surface, the fixed handle 3 is held, the fixed osteotomy plate body is pressed, or the fixing nail is used to drill into the bone to fix the osteotomy plate body in the fixing nail hole 31, and the bone is cut in the osteotomy groove 21 to increase the distal femur osteotomy.

[0056] Case two: When the femoral side 5 osteotomy surface (femoral distal osteotomy surface, front ankle osteotomy surface, rear ankle osteotomy surface, upper inclined osteotomy surface and lower inclined osteotomy surface) has been completed, the installation of the test model finds that the extension is limited (the extension gap is small) and the femoral distal osteotomy surface, the upper inclined osteotomy surface and the lower inclined osteotomy surface need to be osteotomied, and the osteotomy surface adjustment is completed at this time. At this time, the flexion adjustment column and the varus-valgus adjustment column are placed in the original position (not protruding from the reference plate 1), the reference plate 1 is attached to the femoral distal osteotomy surface, the fixed handle 3 is held, the fixed osteotomy plate body is pressed, or the fixed nail is used to drill into the bone of the fixed nail hole 31 to fix the osteotomy plate body, and the osteotomy is performed in the osteotomy groove 21 to increase the femoral distal osteotomy. The osteotomy plate body is placed on the upper inclined osteotomy surface and the lower inclined osteotomy surface respectively to increase the osteotomy amount of the corresponding osteotomy surface. At this time, in the case where the 5 osteotomy surfaces are completed, the femoral distal osteotomy surface, the upper inclined osteotomy surface and the lower inclined osteotomy surface are uniformly adjusted so that the prosthesis can move upward to increase the extension gap.

[0057] Case three: When the femoral distal osteotomy is completed, the femoral model is measured to be No. 5 (anterior-posterior diameter), but the left-right diameter of the femur can only accommodate a No. 4 prosthesis, so only a No. 4 prosthesis can be selected, and in order to avoid excessive cutting of the femoral anterior cortex, the selection of a No. 4 prosthesis results in an increase in the femoral posterior condyle osteotomy, which will cause an increase in the flexion gap and an imbalance in the flexion-extension gap. At this time, the strategy of slightly flexing the femoral prosthesis can be adopted, and the femoral distal osteotomy surface needs to be adjusted to be slightly flexed. At this time, the adjustment column in the adjustment hole 11, 12 is rotated out of the bottom surface of the reference plate 1, the number of turns is rotated out according to the size of the angle to be adjusted, and the number of turns is known through the rotation alignment mark. Then use the fixed nail to drill into the bone of the fixed nail hole 31 to fix the osteotomy plate body, and then reset the adjustment column in the adjustment hole 11, 12 to osteotomize in the osteotomy groove 21. The adjusted femoral osteotomy surface presents a certain flexion, and when a No. 4 prosthesis is used, it ensures that the femoral anterior cortex osteotomy does not appear to be cut, and avoids excessive osteotomy of the posterior condyle, avoiding the imbalance of the flexion-extension gap.

[0058] Case four: When the initial osteotomy of the femoral distal osteotomy surface is too much flexion and needs to be adjusted back, the adjustment column in the adjustment hole 13, 14 is rotated out of the bottom surface of the reference plate 1, and the remaining operation steps are the same as those in case three.

[0059] Case five: When the varus-valgus of the adjusted osteotomy surface is adjusted, the adjustment column in the two adjustment holes 11, 14 / adjustment holes 12, 13 of the reference plate 1 is rotated out of the bottom surface of the reference plate 1, and the remaining operation steps are the same as those in case three.

[0060] It should be noted that the above only describes the preferred embodiments of the present application and is not used to limit the present application. Although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art can modify the technical solutions recorded in the foregoing embodiments or make equivalent replacements to some technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multifunctional device for femoral side adjustment osteotomy in knee replacement surgery, characterized in that: The application relates to an osteotomy plate body and a fixing device for fixing the osteotomy plate body, wherein the osteotomy plate body comprises an integrally-formed reference plate and an osteotomy guide plate; the bottom surface of the reference plate is attached to a formed osteotomy plane as a reference plane during osteotomy; the bottom surface of the osteotomy guide plate is convex downward relative to the bottom surface of the reference plate; the convex part of the osteotomy guide plate is provided with an osteotomy groove, an oscillating saw for osteotomy passes through the osteotomy groove to perform osteotomy, and the osteotomy groove is arranged in parallel with the bottom surface of the reference plate; and 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 are used to quantitatively remove bone. A plurality of adjusting holes are arranged on the reference plate and are diagonally distributed with the center of the reference plate as a symmetric point; an adjusting rotating column is fitted and arranged in each adjusting hole; the length of the adjusting rotating column protruding from the reference plate is adjusted to adjust the angle of the osteotomy groove and the osteotomy plane in the sagittal plane or the coronal plane during osteotomy; wherein the inner wall of the adjusting hole is marked with a rotating alignment mark; the adjusting rotating column is rotated by a preset number of turns; the osteotomy groove and the osteotomy plane in the sagittal plane or the coronal plane are correspondingly increased by a preset angle through the alignment of the rotating alignment mark, so that the angle is quantitatively adjusted.

2. The multi-functional device for adjusting the bone cut for a knee arthroplasty femoral component of claim 1 wherein: The plane of the reference plate is square.

3. The multi-functional device for knee arthroplasty femoral side of adjusting osteotomy according to claim 2, characterized in that: The number of the adjusting holes is four, and two adjusting holes are oppositely arranged on the diagonal lines of the four corners of the reference plate.

4. The multi-functional device for knee arthroplasty femoral side of the bone cut adjustment according to claim 1, characterized in that: When the adjusting rotating column is rotated by half a turn or one turn, the rotating alignment mark is correspondingly marked on the inner wall of the adjusting hole, and the angle of the osteotomy groove and the osteotomy plane in the sagittal plane / coronal plane is correspondingly increased by 1 DEG.

5. The multi-functional device for knee arthroplasty femoral side of the adjustment of the osteotomy according to claim 1, characterized in that: The fixing device comprises a plurality of fixing nail holes provided on the two sides of the reference plate and capable of mounting fixing nails.

6. The multi-functional device for knee arthroplasty femoral side of the adjustment of the osteotomy according to claim 1, characterized in that: The fixing device comprises a plurality of fixing handles provided on the two sides of the reference plate; each fixing handle is inclined upward towards the outside of the reference plate and is provided with a fixing nail hole capable of mounting a fixing nail.

7. The multi-functional device for knee arthroplasty femoral side of adjusting osteotomy according to claim 6, characterized in that: The number of the fixing handles on each side of the reference plate is at least one.

8. The multi-functional device for knee arthroplasty femoral side of the bone cut adjustment according to claim 1, characterized in that: The osteotomy plate body is made of metal or high polymer material.

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