CN118948373A

CN118948373A - Positioning device and total knee replacement equipment

Info

Publication number: CN118948373A
Application number: CN202411042826.4A
Authority: CN
Inventors: 彭飞; 郭雨; 张名俊; 杜亚新; 张弘毅
Original assignee: Jiangsu Shikang Qihang Medical Instrument Co ltd
Current assignee: Jiangsu Shikang Qihang Medical Instrument Co ltd
Priority date: 2024-07-31
Filing date: 2024-07-31
Publication date: 2024-11-15

Abstract

The present application provides a positioning device and a total knee replacement device, which relates to the technical field of medical auxiliary equipment. The positioning device includes a guide plate body, a femoral front end fixing mechanism and a femoral inner and outer edge fixing mechanism; the first surface of the guide plate body is provided with a plurality of femoral osteotomy grooves, and the plurality of femoral osteotomy grooves correspond to a plurality of femoral osteotomy surfaces respectively, and the second surface of the guide plate body is provided with a plurality of fitting surfaces, and the plurality of fitting surfaces contact with a plurality of cortical bones of the femur respectively, wherein the first surface and the second surface are respectively provided on both sides of the guide plate body; the guide plate body is provided with a first mounting portion and a second mounting portion, the femoral front end fixing mechanism is provided on the first mounting portion of the guide plate body, and the femoral inner and outer edge fixing mechanism is provided on the second mounting portion of the guide plate body, wherein the axial direction of the first mounting portion and the axial direction of the second mounting portion are at a preset angle. The positioning device can achieve the technical effect of simplifying the surgical process and improving the surgical accuracy.

Description

Positioning device and total knee arthroplasty equipment

Technical Field

The application relates to the technical field of medical auxiliary instruments, in particular to a positioning device and total knee arthroplasty equipment.

Background

Knee osteoarthritis (knee osteoarthritis, KOA) is a common clinical practice, and total knee arthroplasty is an effective way to eradicate advanced knee joint lesions, greatly improving the quality of life of the patient.

At present, the traditional operation mode adopts an intramedullary positioning mode, a mode of indirectly acquiring a femoral mechanical shaft of a patient through everting 6 degrees of a distal anatomical shaft, adopts a plurality of tools such as a distal osteotomy guide plate, a four-in-one osteotomy guide plate and the like, and only adopts a mode of front reference or rear reference, wherein the two modes have advantages and disadvantages, and the whole traditional operation mode is complex and tedious in operation and large in wound. The existing 3D printing personalized osteotomy guide plate has some development, the problems of large intramedullary positioning trauma and accurate mechanical shaft are avoided by a personalized positioning osteotomy mode, but the distal osteotomy is achieved in one step, and a doctor still needs to use a plurality of sets of instruments such as the traditional four-in-one osteotomy guide plate to complete subsequent osteotomy positioning operation according to own experience. In this regard, how to simplify the surgical procedure and improve the surgical accuracy is a further problem to be solved.

Disclosure of Invention

The application aims to provide a positioning device and total knee arthroplasty equipment, which can achieve the technical effects of simplifying the operation flow and improving the operation accuracy.

In a first aspect, the application provides a positioning device, comprising a guide plate body, a femur front end fixing mechanism and a femur inner and outer edge fixing mechanism;

The first surface of the guide plate body is provided with a plurality of femur osteotomy grooves, the femur osteotomy grooves respectively correspond to a plurality of osteotomy surfaces of a femur, the second surface of the guide plate body is provided with a plurality of binding surfaces, the binding surfaces respectively contact with a plurality of cortical bones of the femur, and the first surface and the second surface are respectively arranged on two sides of the guide plate body;

The guide plate body is provided with a first installation part and a second installation part, the front femur end fixing mechanism is arranged on the first installation part of the guide plate body, the inner femur outer femur edge fixing mechanism is arranged on the second installation part of the guide plate body, and a preset angle is formed between the axial direction of the first installation part and the axial direction of the second installation part.

In the implementation process, the positioning device is provided with a plurality of femur osteotomy grooves and a plurality of joint surfaces on the guide plate body, osteotomies of corresponding parts can be sequentially performed through the femur osteotomy grooves, the joint surfaces are respectively contacted with a plurality of cortical bones of the femur, so that the influence of cartilage is avoided, and meanwhile, the reliability of guide plate fixation is improved and inner and outer ligaments are protected through the femur front end fixing mechanism and the femur inner and outer edge fixing mechanism; in addition, angle and femur phase-match between the first installation department of baffle body and the second installation department, this positioner is through laminating location bone structure more, and accurate location knee joint replacement femur prosthesis position, once only accomplish with prosthesis matched bone face structure cut bone and drilling, reduce the complex problem of multi-instrument operation in the traditional apparatus book, reduce the operation time, alleviate patient's wound, simplify the operation flow, simple and accurate reach best operation effect to realize simplifying the operation flow, improve the technological effect of operation accuracy.

Further, the positioning device further comprises a femur distal medial-lateral condyle positioning mechanism, and the femur distal medial-lateral condyle positioning mechanism is arranged on the second mounting portion.

In the implementation process, the position of the femoral prosthesis is determined and positioned and installed by arranging the femoral distal medial and lateral condyle positioning mechanism, so that the accuracy of the positioning device is further improved.

Further, the femur distal medial and lateral condyle positioning mechanism is provided with a positioning guide pin and a femur distal medial and lateral condyle positioning hole, the femur distal medial and lateral condyle positioning hole is arranged on the second mounting part, and the positioning guide pin is mounted in a matched manner with the femur distal medial and lateral condyle positioning hole.

Further, the femur front end fixing mechanism is provided with a first fixing guide pin and a femur front end fixing hole, the femur front end fixing hole is formed in the first mounting portion, and the first fixing guide pin is mounted in a matched mode with the femur front end fixing hole.

Further, the femur inner and outer edge fixing mechanism further comprises a second fixing guide pin and femur inner and outer edge fixing holes, the femur inner and outer edge fixing holes are formed in the second mounting portion, and the second fixing guide pin is mounted in a matched mode with the femur inner and outer edge fixing holes.

Further, the first surface of the guide plate body is provided with a femur distal end osteotomy groove, a femur anterior condyle osteotomy groove, a femur anterior oblique osteotomy groove, a femur posterior condyle osteotomy groove, a femur posterior oblique osteotomy groove, the femur distal end osteotomy groove, the femur anterior condyle osteotomy groove, the femur anterior oblique osteotomy groove, the femur posterior condyle osteotomy groove, the femur posterior oblique osteotomy groove respectively matches the femur distal end, the femur anterior oblique, the femur posterior condyle, the femur posterior oblique osteotomy groove.

Further, the second surface of the guide plate body is provided with a femur front end joint surface and a femur front inner side joint surface, and the femur front end joint surface and the femur front inner side joint surface are respectively jointed with femur front cortex and femur condyle front inner side parenchyma bones.

In the implementation process, the joint surface of the front end of the femur is jointed with the front cortex of the femur to provide a positioning function; likewise, the anterior medial femoral articulating surface, which interfaces with the anterior medial femoral condyle parenchymal bone, provides a positioning function.

Further, the second surface of the guide plate body is also provided with a femoral distal medial-lateral condyle joint surface, and the femoral distal medial-lateral condyle joint surface is jointed with a femoral distal bone surface.

In the implementation process, the joint surface of the medial and lateral condyles of the distal femur is jointed with the bone surface of the distal femur to provide a positioning function.

Further, an angle between an axial direction of the first mounting portion and an axial direction of the second mounting portion is 90 °.

In a second aspect, embodiments of the present application provide a total knee arthroplasty device comprising a positioning device according to any of the first aspects.

Additional features and advantages of the disclosure will be set forth in the description which follows, or in part will be obvious from the description, or may be learned by practice of the disclosure.

In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view of a first view structure of a positioning device according to an embodiment of the present application;

fig. 2 is a schematic view of a second view structure of a positioning device according to an embodiment of the present application;

FIG. 3 is a schematic view of a third view structure of the positioning device according to the embodiment of the present application;

fig. 4 is a schematic view of a fourth view structure of a positioning device according to an embodiment of the present application;

FIG. 5 is a schematic view of a prosthesis according to an embodiment of the present application;

FIG. 6 is a schematic view of a predicted post-osteotomy bone structure according to an embodiment of the present application;

FIG. 7 is a schematic view of a femoral component prosthesis according to an embodiment of the present application;

FIG. 8 is a schematic view of a first view angle structure of positioning device according to an embodiment of the present application;

Fig. 9 is a schematic view of a second view structure of positioning device placement according to an embodiment of the present application.

Reference numerals: a guide plate body 100; a first mounting portion 101; a second mounting portion 102; a femoral osteotomy groove 110; a distal femoral osteotomy groove 111; a femoral anterior condyle osteotomy groove 112; anterior oblique femoral resection slot 113; a posterior femoral condyle osteotomy groove 114; posterior femoral oblique osteotomy groove 115; a bonding surface 120; a femoral anterior bearing surface 121; anterior medial femoral bearing surface 122; the medial and lateral femoral distal condyle abutment surface 123; a femoral head fixation mechanism 200; a femur inner and outer rim fixing mechanism 300; a femoral distal medial-lateral condyle positioning mechanism 400; a prosthesis 10; a femur 20; positioning means 30.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present application.

In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present application and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.

Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present application will be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the terms "mounted," "configured," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or a point connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the terms "first," "second," and the like, are used primarily to distinguish between different devices, elements, or components (the particular species and configurations may be the same or different), and are not used to indicate or imply the relative importance and number of devices, elements, or components indicated. Unless otherwise indicated, the meaning of "a plurality" is two or more.

The embodiment of the application provides a positioning device and total knee arthroplasty equipment, which can be applied to femur total osteotomy positioning of total knee arthroplasty; the positioning device is provided with a plurality of femur osteotomy grooves and a plurality of joint surfaces on the guide plate body, osteotomies of corresponding parts can be sequentially performed through the femur osteotomy grooves, the joint surfaces are respectively contacted with a plurality of cortical bones of the femur, so that the influence of cartilage is avoided, and meanwhile, the reliability of guide plate fixation is improved and the inner and outer ligaments are protected through the femur front end fixing mechanism and the femur inner and outer edge fixing mechanism; in addition, angle and femur phase-match between the first installation department of baffle body and the second installation department, this positioner is through laminating location bone structure more, and accurate location knee joint replacement femur prosthesis position, once only accomplish with prosthesis matched bone face structure cut bone and drilling, reduce the complex problem of multi-instrument operation in the traditional apparatus book, reduce the operation time, alleviate patient's wound, simplify the operation flow, simple and accurate reach best operation effect to realize simplifying the operation flow, improve the technological effect of operation accuracy.

Referring to fig. 1 to 4, fig. 1 is a schematic diagram of a first view structure of a positioning device according to an embodiment of the present application, fig. 2 is a schematic diagram of a second view structure of a positioning device according to an embodiment of the present application, fig. 3 is a schematic diagram of a third view structure of a positioning device according to an embodiment of the present application, and fig. 4 is a schematic diagram of a fourth view structure of a positioning device according to an embodiment of the present application; the positioning device comprises a guide plate body 100, a femur front end fixing mechanism 200 and a femur inner and outer edge fixing mechanism 300;

Illustratively, the first surface of the guide plate body 100 is provided with a plurality of femur osteotomy grooves 110, the plurality of femur osteotomy grooves 110 respectively correspond to a plurality of osteotomy surfaces of the femur, the second surface of the guide plate body 100 is provided with a plurality of abutment surfaces 120, the plurality of abutment surfaces 120 respectively contact with a plurality of cortical bones of the femur, wherein the first surface and the second surface are respectively arranged at two sides of the guide plate body 100;

Illustratively, the first surface and the second surface of the guide body 100 are respectively disposed at two sides of the guide body, so that the plurality of femur osteotomy grooves 110 and the plurality of abutment surfaces 120 are respectively disposed on different surfaces of the guide body 100, avoiding mutual interference; the femur osteotomy groove 110 is used for osteotomy positioning, and the fitting surface 120 is used for fitting with the cortical bone of the femur, so that the guide plate body 100 is precisely positioned and installed.

Illustratively, the guide plate body 100 is provided with a first mounting portion 101 and a second mounting portion 102, the front femur end fixing mechanism 200 is provided at the first mounting portion 101 of the guide plate body, and the inner femur outer femur end fixing mechanism 300 is provided at the second mounting portion 102 of the guide plate body, wherein a preset angle is provided between an axial direction of the first mounting portion 101 and an axial direction of the second mounting portion 102.

Illustratively, the angle between the axial direction of the first mounting portion 101 and the axial direction of the second mounting portion 102 matches the actual femur, thereby allowing the guide plate body 100 of the positioning device to better fit the femur.

Illustratively, the positioning device is provided with a plurality of femur osteotomy grooves 110 and a plurality of bonding surfaces 120 on the guide plate body 100, and osteotomies of corresponding parts can be sequentially performed through the femur osteotomy grooves 110, and the plurality of bonding surfaces 120 are respectively contacted with a plurality of cortical bones of the femur, so that the influence of cartilage is avoided, and meanwhile, the reliability of guide plate fixation is improved and the inner and outer ligaments are protected through the femur front end fixing mechanism 200 and the femur inner and outer edge fixing mechanism 300; in addition, angle between the first installation department 101 and the second installation department 102 of baffle body 100 and femur phase-match, this positioner is through many laminating location bone structure, and accurate location knee joint replacement femur prosthesis position, once only accomplishes the osteotomy and the drilling of bone face structure that matches with the prosthesis, reduces the complex problem of many apparatuses operation in the traditional apparatus book, reduces the operation time, alleviates patient's wound, simplifies the operation flow, and simple and accurate reaches best operation effect to realize simplifying the operation flow, improve the technological effect of operation accuracy.

Illustratively, the positioning apparatus further includes a femoral distal medial-lateral condyle positioning mechanism 400, the femoral distal medial-lateral condyle positioning mechanism 400 being disposed in the second mounting portion 102.

Illustratively, by providing the femoral distal medial-lateral condyle positioning mechanism 400, the positioning and positioning of the femoral prosthesis is determined, further improving the accuracy of the positioning device.

Illustratively, the femoral distal medial-lateral condyle positioning mechanism 400 is provided with a positioning guide pin and a femoral distal medial-lateral condyle positioning hole, the femoral distal medial-lateral condyle positioning hole being provided in the second mounting portion 102, the positioning guide pin being matingly mounted with the femoral distal medial-lateral condyle positioning hole.

Illustratively, the femoral front fixing mechanism 200 is provided with a first fixing guide pin and a femoral front fixing hole, the femoral front fixing hole is provided in the first mounting portion 101, and the first fixing guide pin is mounted in a matching manner with the femoral front fixing hole.

Illustratively, the femoral inner and outer rim fixation mechanism 300 further includes a second fixation lead and a femoral inner and outer rim fixation hole, the femoral inner and outer rim fixation hole being disposed in the second mounting portion 102, the second fixation lead being matingly mounted with the femoral inner and outer rim fixation hole.

Illustratively, the first surface of the guide plate body 100 is provided with a distal femoral resection slot 111, an anterior femoral resection slot 112, an anterior femoral resection slot 113, a posterior femoral resection slot 114, a posterior femoral resection slot 115, the distal femoral resection slot 111, the anterior femoral resection slot 112, the anterior femoral resection slot 113, the posterior femoral resection slot 114, the posterior femoral resection slot 115 matching the distal femur, the anterior femoral resection, the posterior femoral resection, and the posterior femoral resection slot 115, respectively.

Illustratively, the second surface of the guide plate body 100 is provided with a femoral front end abutment surface 121 and a femoral front medial abutment surface 122, the femoral front end abutment surface 121, the femoral front medial abutment surface 122 respectively abutting the femoral front cortex, the femoral condyle front medial parenchyma bone.

Illustratively, the anterior femoral conforming surface 121 conforms to the anterior femoral cortex, providing a positioning function; likewise, the anterior-medial femoral abutment surface 122, which abuts the anterior-medial femoral substantia bone, provides a positioning function.

Illustratively, the second surface of the guide plate body 100 is further provided with a femoral distal medial-lateral condyle abutment surface 123, the femoral distal medial-lateral condyle abutment surface 123 abutting the femoral distal bone surface.

Illustratively, the medial and lateral femoral distal condyle abutment surface 123, which abuts the distal femoral bone surface, provides a positioning function.

Illustratively, the axial direction of the first mounting portion 101 and the axial direction of the second mounting portion 102 are 90 ° therebetween.

In some embodiments, the angle between the axial direction of the first mounting portion 101 and the axial direction of the second mounting portion 102 may be determined according to the actual needs of the femur, where an angle of 90 ° is merely exemplary and not limiting.

Illustratively, embodiments of the present application provide a total knee arthroplasty device comprising the positioning device shown in figures 1-4.

Illustratively, the fence body 100 is secured by the femoral front fixation hole of the femoral front fixation mechanism 200; through the femur inner and outer edge fixing holes of the femur inner and outer edge fixing mechanism 300, the guide plate body 100 is fixed, and meanwhile, the inner and outer swing range of the pendulum saw is limited, so that inner and outer ligaments are protected; in addition, the position of the femoral prosthesis is determined through the femoral distal medial-lateral condyle positioning holes of the femoral distal medial-lateral condyle positioning mechanism 400, so that the positioning device is convenient to install.

In some implementation scenarios, the positioning device and the total knee arthroplasty device provided by the embodiments of the present application are a total knee arthroplasty device for total knee arthroplasty, which is configured to determine a placement position of a femoral prosthesis after planning, and design a personalized osteotomy guide plate, including: five osteotomy faces and two distal end medial and lateral condyle locating holes are arranged on the guide plate, the front end joint face, the front inner side joint face and the femur distal end joint face are respectively in contact with the cortical bone of the femur, so that the influence of cartilage is avoided, meanwhile, the guide plate is fixed on the bone face, the lateral edges of the medial and lateral condyles are also provided with fixing holes, the fixing reliability of the guide plate is improved, and the medial and lateral ligaments are protected. According to the application, through the multi-joint positioning bone structure, the position of the femoral prosthesis is accurately positioned by the total knee joint replacement, bone cutting and drilling of a bone surface structure matched with the prosthesis are completed at one time, the problem of complex operation of multiple instruments in a traditional instrument book is solved, the operation time is shortened, the trauma of a patient is lightened, the operation flow is simplified, and the optimal operation effect is simply and accurately achieved;

Referring to fig. 5 to 9, fig. 5 is a schematic structural view of a prosthesis according to an embodiment of the present application, fig. 6 is a schematic structural view of a bone structure after bone resection, fig. 7 is a schematic structural view of a femoral component prosthesis according to an embodiment of the present application, fig. 8 is a schematic structural view of a first view of a positioning device according to an embodiment of the present application, and fig. 9 is a schematic structural view of a second view of a positioning device according to an embodiment of the present application;

Optionally, the invention provides a positioning device, which is a femoral total osteotomy guide plate for total knee replacement, a femoral mechanical shaft is planned before operation, the alignment position of a prosthesis is determined, and the problems that the posterior condyle is excessively osteotomy due to the use of an anterior reference or the anterior cortex has obvious notch due to the use of a posterior reference in the traditional operation are avoided by properly adjusting the anterior and posterior positions and buckling of the prosthesis. According to the positions of the femoral prosthesis planned before operation, such as five planes and two posts shown in fig. 5, 6 and 7, designing a total knee joint replacement femoral total osteotomy guide plate capable of realizing the effect of operation planning, wherein the total knee joint replacement femoral total osteotomy guide plate comprises three joint surfaces (a femoral front end joint surface 121, a femoral front inner side joint surface 122 and a femoral distal inner and outer condyle joint surface 123), and a femoral parenchymal bone surface structure are accurately adhered to place the guide plate as shown in fig. 8 and 9, after a joint region of the guide plate and the bone surface are observed to be in seamless joint, guide pins (a femoral front end fixing mechanism 200 and a femoral inner and outer edge fixing mechanism 300) are respectively driven into fixing holes to fix the guide plate, the opposite side cortex is not required to be beaten, the guide pins are cut short, and the femoral inner and outer edge fixing mechanism 300 is fixed to limit the swing amplitude of a femoral distal osteotomy saw, so that the ligament is protected;

The guide plate is provided with an osteotomy groove and a column hole consistent with the prosthesis, a drill bit is drilled along the column hole, and then distal osteotomy, front oblique osteotomy, rear osteotomy and rear oblique osteotomy are sequentially carried out according to the guide plate (a femur distal osteotomy groove 111, a femur anterior condyle osteotomy groove 112, a femur anterior oblique osteotomy groove 113, a femur posterior condyle osteotomy groove 114 and a femur posterior oblique osteotomy groove 115); and then the fixed nails are pulled out, and the guide plate is taken out, so that the prosthesis positioning and osteotomy of the guide plate are completed.

Exemplary, the positioning device and the total knee arthroplasty device provided by the embodiments of the present application at least include the following beneficial effects:

1. the multi-azimuth integration reduces the use of a plurality of combined instruments, simplifies the operation flow and greatly shortens the operation time;

2. The personalized design is carried out, the characteristics of the parenchymal bone surface are attached, and the accuracy of placing the prosthesis is improved;

3. The scheme of preoperative planning is perfectly realized, and the effects before, during and after the operation are consistent;

4. the learning curve of the doctor can be greatly shortened.

In all embodiments of the present application, "large" and "small" are relative terms, "more" and "less" are relative terms, "upper" and "lower" are relative terms, and the description of such relative terms is not repeated herein.

It should be appreciated that reference throughout this specification to "in this embodiment," "in an embodiment of the present application," or "as an alternative" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in this embodiment," "in an embodiment of the application," or "as an alternative embodiment" in various places throughout this specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Those skilled in the art will also appreciate that the embodiments described in the specification are alternative embodiments and that the acts and modules referred to are not necessarily required for the present application.

In various embodiments of the present application, it should be understood that the sequence numbers of the foregoing processes do not imply that the execution sequences of the processes should be determined by the functions and internal logic of the processes, and should not be construed as limiting the implementation of the embodiments of the present application.

The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the application shall be subject to the protection scope of the claims.

Claims

1. A positioning device, characterized in that it comprises a guide plate body, a femoral front end fixing mechanism and a femoral inner and outer edge fixing mechanism;

The first surface of the guide plate body is provided with a plurality of femoral osteotomy grooves, and the plurality of femoral osteotomy grooves respectively correspond to a plurality of osteotomy surfaces of the femur, and the second surface of the guide plate body is provided with a plurality of fitting surfaces, and the plurality of fitting surfaces respectively contact with a plurality of cortical bones of the femur, wherein the first surface and the second surface are respectively provided on both sides of the guide plate body;

The guide plate body is provided with a first mounting portion and a second mounting portion, the femoral front end fixing mechanism is provided on the first mounting portion of the guide plate body, and the femoral inner and outer edge fixing mechanism is provided on the second mounting portion of the guide plate body, wherein a preset angle is formed between the axial direction of the first mounting portion and the axial direction of the second mounting portion.

2. The positioning device according to claim 1 is characterized in that the positioning device also includes a distal femoral medial and lateral condyle positioning mechanism, and the distal femoral medial and lateral condyle positioning mechanism is arranged on the second mounting portion.

3. The positioning device according to claim 2 is characterized in that the distal femoral medial and lateral condyle positioning mechanism is provided with a positioning guide pin and a distal femoral medial and lateral condyle positioning hole, the distal femoral medial and lateral condyle positioning hole is arranged on the second mounting part, and the positioning guide pin is matched and installed with the distal femoral medial and lateral condyle positioning hole.

4. The positioning device according to claim 1 or 2 is characterized in that the front end femoral fixing mechanism is provided with a first fixing guide pin and a front end femoral fixing hole, the front end femoral fixing hole is arranged on the first mounting portion, and the first fixing guide pin is matched and installed with the front end femoral fixing hole.

5. The positioning device according to claim 1 or 2 is characterized in that the femoral inner and outer edge fixing mechanism also includes a second fixing guide pin and a femoral inner and outer edge fixing hole, the femoral inner and outer edge fixing hole is arranged on the second mounting portion, and the second fixing guide pin is matched and installed with the femoral inner and outer edge fixing hole.

6. The positioning device according to claim 1 is characterized in that the first surface of the guide plate body is provided with a distal femoral osteotomy groove, an anterior femoral condyle osteotomy groove, an anterior oblique femoral condyle osteotomy groove, a posterior femoral condyle osteotomy groove, and a posterior oblique femoral osteotomy groove, and the distal femoral osteotomy groove, the anterior femoral condyle osteotomy groove, the anterior oblique femoral condyle osteotomy groove, the posterior femoral condyle osteotomy groove, and the posterior oblique femoral osteotomy groove respectively match the distal femur, the front end of the femur, the anterior oblique femur, the posterior femoral condyle, and the posterior oblique femur.

7. The positioning device according to claim 1 or 6 is characterized in that the second surface of the guide plate body is provided with a front end femoral fitting surface and an anteromedial femoral fitting surface, and the front end femoral fitting surface and the anteromedial femoral fitting surface are respectively fitted with the anterior cortex of the femur and the anteromedial femoral condyle parenchyma.

8. The positioning device according to claim 7 is characterized in that the second surface of the guide plate body is also provided with a distal femoral medial and lateral condyle fitting surface, and the distal femoral medial and lateral condyle fitting surface is fitted with the distal femoral bone surface.

9 . The positioning device according to claim 1 , wherein an axial angle between the first mounting portion and an axial angle between the second mounting portion is 90°.

10. A total knee replacement device, characterized by comprising the positioning device according to any one of claims 1 to 9.