Positioning device suitable for movable platform unicompartmental knee arthroplasty and using method

Abstract

The invention relates to a positioning device suitable for movable platform unicompartmental knee arthroplasty and a using method, the positioning device comprises a first positioning block and a second positioning block, the first positioning block and the second positioning block are integrally formed and are of a double-column integrated structure; the first positioning block and the second positioning block extend from the joint to the unconnected end, the section of the unconnected end is a slope, and the second width value of the unconnected end of the second positioning block is larger than the first width value of the unconnected end of the first positioning block; the positioning device is used for being arranged in a gap between a femoral bone drilling guider and a vertical osteotomy surface of a tibia so as to position an optimal drilling position. The device makes up a blank in the market, solves the problem that in the prior art, femur drilling completely depends on experience to judge the femur medial condyle center line through a simple structure, can be used for assisting in accurately positioning the drilling position, greatly reduces the operation difficulty and medical risks, and is simple in structure, low in manufacturing cost and extremely high in medical popularization value.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of tibial and femoral positioning, and in particular, to a positioning device suitable for use in mobile bearing unicompartmental arthroplasty and a use method thereof. BACKGROUND

[0002] Mobile bearing medial unicompartmental arthroplasty, as a minimally invasive knee preservation procedure, is an effective means for treating medial knee osteoarthritis. The mobile bearing liner provided by this procedure can effectively reduce polyethylene wear and has good long-term use effect. Mobile bearing medial unicompartmental arthroplasty usually uses mechanical tools to perform osteotomy and prosthesis installation based on bone anatomy. It has high technical requirements, and accurate osteotomy to obtain good prosthesis matching and liner movement trajectory is the key to the success of the surgery.

[0003] However, there are some problems in the prior art. Reports indicate that some cases will experience liner dislocation after surgery, and in severe cases, even total knee arthroplasty may be required. This phenomenon is mainly due to insufficient standardization of the operation process, especially during femoral drilling. Femoral drilling determines the position of the femoral prosthesis, and Oxford manufacturers recommend using the medial condyle midline of the femur to guide the medial and lateral position of the femoral prosthesis. However, due to the minimally invasive incision and bone interference, it is difficult for the doctor to accurately identify the medial condyle midline of the femur, resulting in the femoral prosthesis being too medial or too lateral. Further, during knee flexion and extension, the mobile bearing liner moves forward and backward on the tibial prosthesis with the femoral prosthesis, and the medial and lateral positions of the femoral prosthesis that are not neutral will cause abnormal medial and lateral positions of the mobile bearing liner, increasing the risk of liner dislocation. Although digital orthopedic technologies, such as computer-assisted navigation, robot-assisted technology, sensor technology, personalized osteotomy guide (PSI) technology, and 3D printing technology, are widely used in mobile bearing medial unicompartmental arthroplasty and can improve the accuracy and individualization of the surgery, these technologies have limitations such as high cost, long time consumption, and often require additional or extended incisions, increasing the complexity of the surgery and the burden on the patient.

[0004] Therefore, there is an urgent need in the art to find a new technical solution to solve the above problems. SUMMARY

[0005] To overcome the problems in the related art, the present disclosure provides a positioning device suitable for use in mobile bearing unicompartmental arthroplasty and a use method thereof.

[0006] According to a first aspect of the embodiments of the present disclosure, a positioning device suitable for use in mobile bearing unicompartmental arthroplasty is provided, which comprises: a first positioning block and a second positioning block, the first positioning block and the second positioning block are integrally formed and have a double-column integrated structure;

[0007] The first positioning block and the second positioning block extend from the connection to the unconnected end, the unconnected end is a slope in cross section, the second width value of the unconnected end of the second positioning block is greater than the first width value of the unconnected end of the first positioning block.

[0008] The positioning device is used to be placed in the gap between the femoral drilling guide and the vertical tibial bone cutting surface to position the optimal drilling position.

[0009] Optionally, the first positioning block has a column length of 50mm, and the second positioning block has a column length of 50mm.

[0010] Optionally, the first positioning block and the second positioning block have a column height of 5mm.

[0011] Optionally, the unconnected end of the first positioning block has a width of 6mm, and the unconnected end of the second positioning block has a width of 7mm.

[0012] Optionally, the slope of the unconnected end of the first positioning block and the second positioning block is 45°.

[0013] According to the second aspect of the disclosed embodiment, a positioning device usage method suitable for mobile platform unicompartmental arthroplasty is provided, which is applied to the positioning device of the first aspect of the disclosed embodiment, and the method comprises:

[0014] Install the femoral drilling guide and tightly attach it to the posterior condyle of the femur.

[0015] Place the positioning device in the gap between the femoral drilling guide and the vertical tibial bone cutting surface.

[0016] Adjust the position of the femoral drilling guide according to the width of one end of the positioning device to determine the optimal drilling position.

[0017] Optionally, the method is suitable for mobile platform unicompartmental arthroplasty, which is used to quantitatively control the medial and lateral positions of the femoral prosthesis to avoid postoperative spacer dislocation.

[0018] In summary, the present disclosure relates to a positioning device suitable for mobile platform unicompartmental arthroplasty and a use method thereof, the positioning device comprising: a first positioning block and a second positioning block, the first positioning block and the second positioning block are integrally formed and are of a double-column integrated structure; the first positioning block and the second positioning block extend from the connection to the unconnected end, the unconnected end is a slope in cross section, and the second width value of the unconnected end of the second positioning block is greater than the first width value of the unconnected end of the first positioning block; the positioning device is used to be placed in the gap between the femoral drilling guide and the tibial vertical bone cutting surface to position the optimal drilling position. The device fills a gap in the market, solves the situation that the femoral drilling in the prior art completely relies on experience to judge the medial condyle center line through a simple structure, can assist in accurately positioning the drilling position with the device, greatly reduces the operation difficulty and medical risk, and has simple device structure, low cost, and great medical promotion value.

[0019] Other features and advantages of the present disclosure will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and are used together with the following specific embodiments to explain the present disclosure but do not constitute a limitation on the present disclosure. In the drawings:

[0021] Figure 1 is a structural schematic view of a positioning device suitable for mobile platform unicompartmental arthroplasty according to an exemplary embodiment;

[0022] Figure 2 is a structural schematic view of a positioning device suitable for mobile platform unicompartmental arthroplasty according to an exemplary embodiment; Figure 1 is a structural schematic view of a positioning device suitable for mobile platform unicompartmental arthroplasty according to an exemplary embodiment;

[0023] Figure 3 is a flowchart of a use method of a positioning device suitable for mobile platform unicompartmental arthroplasty according to an exemplary embodiment;

[0024] Figure 4 is a photo of a positioning device for mobile platform unicompartmental arthroplasty in use. DETAILED DESCRIPTION

[0025] The specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure.

[0026] Figure 1 and Figure 2 is a structural schematic view of a positioning device suitable for mobile platform unicompartmental arthroplasty according to an exemplary embodiment, asFigure 1 and Figure 2 As shown in FIGS. 1-2, the positioning device 100 comprises a first positioning block 110 and a second positioning block 120, which are integrally formed and have a double-column integrated structure. The first positioning block 110 and the second positioning block 120 extend from the connecting portion to the unconnected end, and the cross section of the unconnected end is a slope. The second width of the unconnected end of the second positioning block 120 is greater than the first width of the unconnected end of the first positioning block 110. The positioning device is used to be placed in the gap between the femoral drilling guide and the tibial perpendicular bone cutting surface to position the optimal drilling position. The slope of the unconnected end of the first positioning block and the second positioning block is 45°.

[0027] Specifically, Figure 2 FIG. 3 is a top view of the positioning device, according to Figure 2 It can be seen that the length of the first positioning block column is 50 mm, and the length of the second positioning block column is 50 mm. The column height of the first positioning block and the second positioning block is 5 mm. The width of the unconnected end of the first positioning block is 6 mm, and the width of the unconnected end of the second positioning block is 7 mm.

[0028] For example, when drilling the femur, first install the bone scoop to measure the femoral prosthesis model (take the XS model commonly used for Chinese patient population as an example). Then, install the femoral drilling guide, which is in close contact with the femoral posterior condyle, and adjust the medial-lateral position and rotational position of the bone cutting guide. According to the width of the XS model femoral drilling guide (12.5 mm), the width of the femoral prosthesis (17.5 mm), the width of the spacer (20 mm), and the width of the lateral wall of the tibial prosthesis (1.5 mm), it is calculated that the distance between the femoral drilling guide and the tibial perpendicular bone cutting surface needs to be controlled between 5.25-7.25 mm (i.e. 6-7 mm) to obtain a neutral medial-lateral position and ensure that the spacer and the lateral wall of the tibial prosthesis maintain an ideal distance of 0-2 mm.

[0029] It should be noted that the Chinese patient population is basically of XS model, and the following is taken as an example. The femoral drilling guide is 12.5 mm, the femoral prosthesis width is 17.5 mm, the spacer width is 20 mm, and the tibial prosthesis lateral wall width is 1.5 mm. In order to control the distance between the spacer and the lateral wall of the tibial prosthesis to be between 0-2 mm, it is calculated that the distance between the femoral drilling guide and the tibial perpendicular bone cutting surface needs to be controlled between 5.25-7.25 mm, i.e. the distance needs to be controlled between 6, 7 mm, to obtain a neutral medial-lateral position.

[0030] The positioning device in the embodiment of the present application is used for accurately positioning the drilling position of the femur. The spacing block adopts a double-column integrated structure, which is compact and stable, ensures that the fixed position can be maintained during the operation, and improves the positioning accuracy. In terms of size specifications, the length is 50 mm, and the height is 5 mm (double-sided equal length and equal height design), which is suitable for the operation space requirement. The width gradient design is 6 mm at one end and 7 mm at the other end; the double-sided 45° slope design is suitable for the 45° operation requirement during the operation, and is convenient for the doctor to quickly adjust the position of the spacing block. When in use, the spacing block is placed in the gap between the femoral drilling guide and the vertical bone cutting surface of the tibia, and the best drilling position can be positioned. The one-key determination of the drilling position is realized by physical limiting, which simplifies the operation process. The positioning accuracy is improved, and the problem of liner dislocation caused by the position deviation of the femoral prosthesis is effectively avoided. The device has a simple structure, low cost, and great medical promotion value.

[0031] Figure 3 is a flow chart of a positioning device use method suitable for mobile platform unicompartmental arthroplasty according to an exemplary embodiment, which is applied to the positioning device, and the method comprises the following steps:

[0032] In step 301, the femoral drilling guide is installed and closely attached to the posterior condyle of the femur.

[0033] In step 302, the positioning device is placed in the gap between the femoral drilling guide and the vertical bone cutting surface of the tibia.

[0034] In step 303, the position of the femoral drilling guide is adjusted according to the width of one end of the positioning device to determine the best drilling position.

[0035] Optionally, the method is suitable for mobile platform unicompartmental arthroplasty, which is used for quantitatively controlling the medial and lateral positions of the femoral prosthesis to avoid postoperative liner dislocation.

[0036] In addition, Figure 4 is a photo of the use of the positioning device during the operation.

[0037] In summary, the present disclosure relates to a positioning device suitable for mobile platform unicompartmental arthroplasty and a use method thereof, the positioning device comprising: a first positioning block and a second positioning block, the first positioning block and the second positioning block are integrally formed and are double-column integrated structure; the first positioning block and the second positioning block extend from the connecting place to the unconnected end, the unconnected end is a slope in cross section, the second width value of the unconnected end of the second positioning block is greater than the first width value of the unconnected end of the first positioning block; the positioning device is used to be placed in the gap between the femoral drilling guide and the tibial perpendicular bone cutting surface to position the optimal drilling position. The type makes up a gap in the market, solves the situation that the femoral drilling in the prior art completely relies on experience to judge the medial femoral condyle center line through a simple structure, can assist accurate positioning of the drilling position with the device, greatly reduces the operation difficulty and medical risk, and the device structure is simple, the cost is low, and the device has great medical promotion value.

[0038] The preferred embodiments of the present disclosure are described in detail above in combination with the drawings, but the present disclosure is not limited to the specific details in the above-described embodiments, and various simple modifications can be made to the technical solutions of the present disclosure within the technical concept of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0039] In addition, it should be noted that various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, various possible combination manners are not described again in the present disclosure.

[0040] In addition, various different embodiments of the present disclosure can also be combined in any appropriate manner, as long as they do not deviate from the idea of the present disclosure, and they should also be considered as disclosed by the present disclosure.

Claims

1. A positioning device suitable for unicompartmental arthroplasty on a mobile platform, characterized in that, The positioning device includes: a first positioning block and a second positioning block, wherein the first positioning block and the second positioning block are integrally formed and have a double-column integrated structure; The first positioning block and the second positioning block extend from the connection point to the unconnected end. The unconnected end has a slope cross section. The second width value of the unconnected end of the second positioning block is greater than the first width value of the unconnected end of the first positioning block. The positioning device is used to insert into the gap between the femoral drilling guide and the vertical osteotomy surface of the tibia in order to locate the optimal drilling position.

2. The positioning device for unicompartmental arthroplasty on a mobile platform according to claim 1, characterized in that, The first positioning block has a column length of 50mm, and the second positioning block has a column length of 50mm.

3. The positioning device for unicompartmental arthroplasty on a mobile platform according to claim 1, characterized in that, The column height of the first positioning block and the second positioning block is 5mm.

4. The positioning device for unicompartmental arthroplasty on a mobile platform according to claim 1, characterized in that, The width of the unconnected end of the first positioning block is 6mm, and the width of the unconnected end of the second positioning block is 7mm.

5. The positioning device for unicompartmental arthroplasty on a mobile platform according to claim 1, characterized in that, The slope of the unconnected end of the first and second positioning blocks is 45°.

6. A method for using a positioning device suitable for unicompartmental arthroplasty on a mobile platform, characterized in that, The method is applied to the positioning device according to any one of claims 1-5, and the method includes: Install the femoral drilling guide, close to the posterior condyle of the femur; The positioning device is placed in the gap between the femoral drilling guide and the vertical osteotomy surface of the tibia. Adjust the position of the femoral drilling guide according to the width of one end of the positioning device to determine the optimal drilling position.

7. The method of using the positioning device in mobile platform unicompartmental arthroplasty as described in claim 6, the method being applicable to mobile platform medial unicompartmental arthroplasty, for quantitatively controlling the medial and lateral positions of the femoral prosthesis to avoid postoperative liner dislocation.

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