A femoral condyle horizontal osteotomy system and its use method

Abstract

The present invention discloses a femoral condyle horizontal bone cutting system, including a positioning module, a bone cutting navigation module and a positioning frame; wherein the positioning module includes a bone surface fitting part and a nail group guiding mechanism, the bone surface fitting part is obtained by reverse design according to the surface shape of the patient's femoral condyle, and the nail group guiding mechanism is arranged on the bone surface fitting part, and is used to guide the first positioning nail group to be inserted into the bone; the bone cutting navigation module is connected to the positioning frame, and the bone cutting navigation module and the positioning frame pass through the first positioning nail group, and the bone cutting navigation module includes a navigation body and a bone cutting groove and a guide hole arranged on the navigation body. The present invention not only retains the advantages of high positioning accuracy and good adaptability of customized surgical instruments, but also retains the advantages of convenient bone cutting, wide application range and high reliability of standard instruments; simplifies the function and structure of customized surgical instruments, reduces the design workload, and reduces the manufacturing cost; reduces the damage to the patient's bone by surgery.

Description

Technical Field

[0001] The present invention belongs to the technical field of bone cutting systems for knee replacement surgery, and in particular relates to a partially customized femoral condyle horizontal bone cutting system and a use method thereof. Background Art

[0002] The horizontal osteotomy of the femoral condyle is a decisive step in the osteotomy during total knee replacement surgery. Usually in knee replacement surgery, the horizontal osteotomy surface of the femoral condyle is the reference surface for the subsequent osteotomy process and an important support surface for the installation of the prosthesis. The accuracy of the horizontal osteotomy surface directly affects the accuracy of the force line of the lower limb after surgery. Therefore, in order to ensure the accuracy of this osteotomy step, commercial total knee replacement surgery almost always adopts a very complex processing method.

[0003] Existing technical solutions can be roughly divided into two types: one is to use standardized bone cutting instruments to plan the horizontal bone cutting plan of the femoral condyle according to the anatomical characteristics of the knee joint; the other is to combine reverse design and rapid prototyping technology to directly use the patient's bone surface information to customize the bone cutting instrument. The former usually undergoes a long period of clinical testing to form their own systematic and complete solutions with high reliability, but at the same time the instrument composition is complex, the surgical plan is difficult to implement, and it is highly dependent on the physician's personal experience; the latter uses new design concepts and manufacturing technologies to greatly simplify the surgical plan. Since this solution directly extracts the patient's own characteristics, the structure of the bone cutting guide has a strong matching ability, high positioning accuracy, and the bone cutting process can generally be simplified.

[0004] Compared with traditional surgical guides, customized bone cutting guides have great advantages, but also obvious shortcomings. Existing customized bone cutting guides, because the design and manufacturing process are not limited by traditional manufacturing technology, often try to integrate more functions in the design of the guide, so that multiple bone cutting steps can be completed with one instrument. Thanks to the development of additive manufacturing technology, the above design concept can be perfectly realized. This kind of customized bone cutting guide is usually used once and discarded after use. Moreover, because it is a customized instrument, it is inevitable that a lot of repetitive design work will be generated, and the manpower and time costs are high. In addition, additive manufacturing technology still has a certain gap with traditional technology in manufacturing accuracy. Implementing multiple surgical steps on a single bone cutting guide is prone to continuous accumulation of errors, thus affecting the surgical effect. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a femoral condyle horizontal osteotomy system and a method of using the same.

[0006] A femoral condyle horizontal bone cutting system of the present invention comprises a positioning module, a bone cutting navigation module and a positioning frame; wherein the positioning module comprises a bone surface fitting portion and a nail group guiding mechanism, the bone surface fitting portion is reversely designed according to the surface shape of the patient's femoral condyle, and the nail group guiding mechanism is arranged on the bone surface fitting portion to guide a first positioning nail group to be inserted into the bone; the bone cutting navigation module is connected to the positioning frame, the bone cutting navigation module and the positioning frame pass through the first positioning nail group, and the bone cutting navigation module comprises a navigation body and a bone cutting groove and a guide hole arranged on the navigation body.

[0007] The above technical solution is preferred, wherein the area where the bone surface fitting portion fits the bone surface extends from the anterior condyle along the trochlear groove to the distal end of the femoral condyle, and extends backwards from the intercondylar fossa along the inner and outer sides respectively, forming a shape that completely matches the morphology of the femoral condyle.

[0008] The above technical solution is preferred, wherein the nail group guiding mechanism includes a first semi-open guide cylinder, a second semi-open guide cylinder and a third semi-open guide cylinder respectively arranged on the front side, the distal inner side and the distal outer side of the bone surface fitting portion, wherein the first semi-open guide cylinder, the second semi-open guide cylinder and the third semi-open guide cylinder are detachably connected with the first positioning guide cylinder, the second positioning guide cylinder and the third positioning guide cylinder, and the first positioning nail group includes the first positioning nail, the second positioning nail and the third positioning nail, which are respectively inserted into the bone through the first positioning guide cylinder, the second positioning guide cylinder and the third positioning guide cylinder.

[0009] The above technical solution is preferred, wherein an axial dislocation groove is respectively provided on the proximal side of the first semi-open guide cylinder and the rear side of the second semi-open guide cylinder and the third semi-open guide cylinder, and the dislocation groove extends along the cylinder walls of the first semi-open guide cylinder, the second semi-open guide cylinder and the third semi-open guide cylinder to the edge of the bone surface fitting portion.

[0010] Preferably, the inner cylinder walls of the first semi-open guide cylinder, the second semi-open guide cylinder and the third semi-open guide cylinder are provided with a plurality of first limiting teeth arranged axially on a side opposite to the dislocation groove, and the outer cylinder walls of the first positioning guide cylinder, the second positioning guide cylinder and the third positioning guide cylinder are provided with second limiting teeth matched with the first limiting teeth; the position of the first semi-open guide cylinder relative to the bone surface fitting portion is determined according to the position of the guide hole of the bone cutting navigation module, and the position of the bone cutting navigation module during the operation is determined by the position of the horizontal bone cutting surface of the femoral condyle planned before the operation;

[0011] The positions of the second semi-open guide cylinder and the third semi-open guide cylinder relative to the bone surface fitting portion are determined by the placement positions of the bone cutting navigation module and the positioning frame during the operation.

[0012] The above technical solution is preferred, in which the inner and outer sides of the navigation body are bent backwards and are symmetrical to each other, the guide hole is arranged at the upper part of the navigation body, the bone cutting groove is arranged at the lower part of the guide hole, the axial direction of the guide hole is perpendicular to the outer wall surface of the navigation body, and the second positioning pin group and the first positioning pin pass through the guide hole.

[0013] The above technical solution is preferred, wherein the positioning frame includes a main body, a first limiting column, a second limiting column, a first limiting sleeve and a second limiting sleeve, one end of the main body is provided with the first limiting column and the second limiting sleeve through a cantilever, and the other end of the main body is provided with the first limiting sleeve and the second limiting sleeve through a cantilever.

[0014] Preferably, the bottom surface of the navigation body is provided with a first limiting hole and a second limiting hole in parallel along the inner and outer directions, and the first limiting post and the second limiting post are respectively plugged into the first limiting hole and the second limiting hole.

[0015] The above technical solution is preferred, wherein the first limiting tooth and the second limiting tooth are both arc-shaped limiting teeth, the adjacent tooth spacing between the first limiting teeth and the second limiting teeth is 0.5-1.2mm, and the tooth height of the first limiting tooth and the second limiting tooth is 0.2-1mm; and the outer diameters of the first positioning guide cylinder, the second positioning guide cylinder and the third positioning guide cylinder are greater than the width of the dislocation groove; the width of the dislocation groove is greater than the diameters of the first positioning pin, the second positioning pin and the third positioning pin.

[0016] A method for using the femoral condyle horizontal osteotomy system as described above of the present invention comprises the following steps:

[0017] (1) inserting a first positioning nail group into the bone through a positioning module, and removing the positioning module;

[0018] (2) installing a bone cutting navigation module and a positioning frame to the surgical site under the positioning of the first positioning nail group;

[0019] (3) inserting a second positioning nail group into the bone under the guidance of the guide hole of the bone cutting navigation module, and removing the first positioning nail group and the positioning frame;

[0020] (4) Bone cutting: removing the second positioning pin group and the bone cutting guide module.

[0021] The advantages and positive effects of the present invention are as follows: the present invention provides a femoral condyle horizontal bone cutting system, which not only retains the advantages of customized surgical instruments with high positioning accuracy and good adaptability, but also retains the advantages of standard instruments with convenient bone cutting, wide application range and high reliability; simplifies the function and structure of customized surgical instruments, reduces the design workload, and reduces the manufacturing cost; and reduces the damage to the patient's bone caused by surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a structural schematic diagram of a positioning module provided by an embodiment of the present invention;

[0023] Figure 2 is a structural schematic diagram of a first positioning guide cylinder provided by an embodiment of the present invention;

[0024] Figure 3 It is a schematic diagram of the installation of the first positioning guide cylinder and the first semi-open guide cylinder provided by one embodiment of the present invention;

[0025] Figure 4 It is a schematic diagram of the locking of the first positioning guide cylinder and the first semi-open guide cylinder provided by one embodiment of the present invention;

[0026] Figure 5 is a schematic diagram of assembling a positioning module and a first positioning pin group provided by an embodiment of the present invention;

[0027] Figure 6 is a structural schematic diagram of a bone cutting navigation module provided by an embodiment of the present invention;

[0028] Figure 7 is a structural schematic diagram of a positioning frame provided by an embodiment of the present invention;

[0029] Figure 8 It is a schematic diagram of assembling the bone cutting navigation module and the second positioning nail group provided by one embodiment of the present invention;

[0030] Fig. 9 is a usage status diagram of a positioning module provided by an embodiment of the present invention;

[0031] Fig.10 This is a diagram showing the use status of a bone cutting navigation module and a positioning frame provided in one embodiment of the present invention;

[0032] Fig.11 This is a bone cutting state diagram of a bone cutting navigation module provided by an embodiment of the present invention.

[0033] Wherein: 10, bone surface fitting part; 101, first semi-open guide cylinder; 102, second semi-open guide cylinder; 103, third semi-open guide cylinder; 111, first positioning guide cylinder; 112, second positioning guide cylinder; 113, third positioning guide cylinder; 121, first positioning nail; 122, second positioning nail; 123, third positioning nail;

[0034] 20, navigation body; 210, bone cutting groove; 211, guide hole; 212, first limiting hole; 213, second limiting hole; 221, fourth positioning pin; 222, fifth positioning pin; 223, sixth positioning pin;

[0035] 30. Main body; 311. First limiting column; 312. Second limiting column; 321. First limiting sleeve; 322. Second limiting sleeve. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0039] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0040] On the one hand, this embodiment provides a femoral condyle horizontal osteotomy system, such as Figure 1-11 As shown, it includes a positioning module, a bone cutting navigation module and a positioning frame; wherein the positioning module includes a bone surface fitting part 10 and a nail group guiding mechanism, the bone surface fitting part 10 is reversely designed according to the surface shape of the patient's femoral condyle, and the nail group guiding mechanism is arranged on the bone surface fitting part 10, and is used to guide the first positioning nail group to be inserted into the bone; the bone cutting navigation module is connected to the positioning frame, and the bone cutting navigation module and the positioning frame pass through the first positioning nail group, and the bone cutting navigation module includes a navigation body 20 and a bone cutting groove 210 and a guide hole 211 arranged on the navigation body 20.

[0041] The bone surface fitting part is obtained by reverse design according to the surface shape of the femoral condyle, so that the bone surface fitting part can achieve a high degree of fitting with the surface of the femoral condyle and the position of the bone surface fitting part on the femoral condyle is unique.

[0042] Specifically, the area where the bone surface fitting portion 10 fits the bone surface extends from the anterior condyle along the trochlear groove to the distal end of the femoral condyle, and extends backward along the inner and outer sides from the intercondylar notch, forming a shape that completely matches the morphology of the femoral condyle.

[0043] Specifically, the nail group guide mechanism includes a first semi-open guide cylinder 101, a second semi-open guide cylinder 102 and a third semi-open guide cylinder 103, which are respectively arranged on the front side, the distal inner side and the distal outer side of the bone surface fitting part 10. The first semi-open guide cylinder 101, the second semi-open guide cylinder 102 and the third semi-open guide cylinder 103 are structurally unified. The first semi-open guide cylinder 101, the second semi-open guide cylinder 102 and the third semi-open guide cylinder 103 are detachably connected with a first positioning guide cylinder 111, a second positioning guide cylinder 112 and a third positioning guide cylinder 113. The first positioning guide cylinder 111, the second positioning guide cylinder 112 and the third positioning guide cylinder 113 are structurally unified. The first positioning nail group includes a first positioning nail 121, a second positioning nail 122 and a third positioning nail 123, which are respectively inserted into the bone through the first positioning guide cylinder 111, the second positioning guide cylinder 112 and the third positioning guide cylinder 113. The first positioning nail 121, the second positioning nail 122 and the third positioning nail 123 provide a positioning function for the installation of the bone cutting navigation module and the positioning frame in the next step.

[0044] Specifically, the inner sides of the first semi-open guide cylinder 101, the second semi-open guide cylinder 102 and the third semi-open guide cylinder 103 are through holes, with a diameter range of 5-8mm, and a depth of 6-15mm; the first semi-open guide cylinder 101 is provided with an axial dislocation groove towards the proximal side, the second semi-open guide cylinder 102 and the third semi-open guide cylinder 103 are provided with an axial dislocation groove towards the rear side, and the dislocation groove extends to the edge of the bone surface fitting portion 10 along the cylinder wall of the first semi-open guide cylinder 101, the second semi-open guide cylinder 102 and the third semi-open guide cylinder 103. Optionally, the width of the dislocation groove is 2.2-3.8mm. By arranging the dislocation groove, the first semi-open guide cylinder 101, the second semi-open guide cylinder 102 and the third semi-open guide cylinder 103 are semi-open structures, so as to ensure that no interference occurs with the first positioning nail group during the process of removing the positioning module. The first positioning guide cylinder 111 , the second positioning guide cylinder 112 and the third positioning guide cylinder 113 function to provide a fully surrounding guide structure for the first positioning pin, the second positioning pin and the third positioning pin.

[0045] Specifically, a plurality of first limiting teeth, for example, 8-12 first limiting teeth, are axially arranged on the side of the inner cylinder wall of the first semi-open guide cylinder 101, the second semi-open guide cylinder 102 and the third semi-open guide cylinder 103 opposite to the dislocation groove.

[0046] Specifically, the axial lengths of the first positioning guide cylinder 111, the second positioning guide cylinder 112 and the third positioning guide cylinder 113 are 11.3-31.3 mm, the outer contour diameters are the same as the through hole diameters of the first semi-open guide cylinder, the second semi-open guide cylinder and the third semi-open guide cylinder, and the inner hole diameters are 1.8-3.2 mm.

[0047] The outer wall circumferences of the first positioning guide cylinder 111, the second positioning guide cylinder 112 and the third positioning guide cylinder 113 are provided with second limiting teeth at intervals of 60°, and the first limiting teeth cooperate with the second limiting teeth. Axial arc-shaped grooves are provided between adjacent second limiting teeth in the circumferential direction.

[0048] Specifically, the position of the first semi-open guide cylinder 101 relative to the bone surface fitting part 10 is determined according to the position of the guide hole (nail channel) of the bone cutting navigation module, and the position of the bone cutting navigation module during the operation is determined by the position of the horizontal bone cutting surface of the femoral condyle planned before the operation; the positions of the second semi-open guide cylinder 102 and the third semi-open guide cylinder 103 relative to the bone surface fitting part 10 are determined by the placement positions of the bone cutting navigation module and the positioning frame during the operation.

[0049] The bone surface fitting part 10, the first semi-open guide cylinder 101, the second semi-open guide cylinder 102 and the third semi-open guide cylinder 103 described in this embodiment constitute a customized component, which is processed by additive manufacturing technology. The additive manufacturing technology suitable for processing the customized component mainly refers to a 3D printing technology using laser or electron beam as a heat source and medical metal or non-metallic materials, such as medical nylon, medical stainless steel, medical cobalt-chromium-molybdenum alloy and medical titanium alloy as raw materials.

[0050] In this embodiment, the positioning module is a customized product, while the bone cutting navigation module and the positioning frame are standard products; when used for different patients, the bone surface fitting portion 10, the first semi-open guide cylinder 101, the second semi-open guide cylinder 102 and the third semi-open guide cylinder 103 form a customized component, which is processed by additive manufacturing technology and redesigned according to the needs of different patients; while the bone cutting navigation module and the positioning frame are both standard parts and do not need to be redesigned, thereby reducing the design workload; it retains the advantages of customized surgical instruments with high positioning accuracy and good adaptability, and retains the advantages of standard instruments with convenient bone cutting, wide range of applications and high reliability; it simplifies the function and structure of customized surgical instruments, reduces the design workload and difficulty, and reduces the manufacturing cost.

[0051] Specifically, the navigation body is symmetrical inside and outside in appearance, the inside and outside of the navigation body 20 are both bent backward and symmetrical, the guide hole 211 is provided at the upper part of the navigation body 20, the bone cutting groove 210 is provided at the lower part of the guide hole 211, the axial direction of the guide hole 211 is perpendicular to the outer wall of the navigation body 20, and the second positioning nail group and the first positioning nail 121 pass through the guide hole 211. The second positioning nail group includes a fourth positioning nail 221, a fifth positioning nail 222 and a sixth positioning nail 223. Optionally, the thickness of the navigation body in the front-to-back direction is 8.5-32.8 mm, and the two sides of the navigation body form an angle of 15°-30° with the middle. The bone cutting groove 210 is located at the lower part of the bone cutting navigation module, and the bone cutting groove is composed of two parallel bone cutting grooves, and the spacing between the two bone cutting grooves is 2-6 mm. The guide holes are distributed in three areas of the navigation body, namely the middle and both sides, in order to form an angle after the nails are placed to fix the navigation body. The principle of nail placement is to insert the second positioning needle group into any guide hole in the three areas of the navigation body according to the actual situation. A large number of guide holes are provided on the navigation body to meet the needs of different patients during surgery. In addition, no two guide holes will interfere with each other.

[0052] Specifically, the positioning frame includes a main body 30, a first limiting column 311, a second limiting column 312, a first limiting sleeve 321 and a second limiting sleeve 322. One end of the main body 30 is provided with the first limiting column 311 and the second limiting column 312 through a cantilever, and the other end of the main body 30 is provided with the first limiting sleeve 321 and the second limiting sleeve 322 through a cantilever. The bottom surface of the navigation body 20 is provided with a first limiting hole 212 and a second limiting hole 213 in parallel along the inner and outer directions, and the first limiting column 311 and the second limiting column 312 are respectively plugged with the first limiting hole 212 and the second limiting hole 213. Optionally, the first limiting hole and the second limiting hole are symmetrically distributed, and the center interval is 12-36mm. The first limiting sleeve 321 and the second limiting sleeve 322 are used to pass through the second positioning nail and the third positioning nail.

[0053] Optionally, the center axis distance between the first limiting sleeve and the second limiting sleeve is equal to the center axis distance between the second semi-open guide cylinder 102 and the third semi-open guide cylinder 103; the center axis of the main rod is the axis of symmetry of the first limiting column and the second limiting column and the first limiting sleeve and the second limiting sleeve in spatial position.

[0054] Optionally, the first limiting tooth and the second limiting tooth are both arc-shaped limiting teeth, the adjacent tooth spacing between the first limiting teeth and the second limiting teeth is 0.5-1.2mm, and the tooth height of the first limiting tooth and the second limiting tooth is 0.2-1mm. The thickness of the first limiting tooth is 0.3-1.2mm. And the outer diameters of the first positioning guide cylinder, the second positioning guide cylinder and the third positioning guide cylinder are larger than the width of the dislocation groove, which can prevent the first positioning guide cylinder, the second positioning guide cylinder and the third positioning guide cylinder from falling out of the dislocation groove; the width of the dislocation groove is larger than the diameter of the first positioning pin, the second positioning pin and the third positioning pin, which can avoid the first positioning pin, the second positioning pin and the third positioning pin from interfering with the positioning module when the positioning module is removed.

[0055] A method for using the femoral condyle horizontal osteotomy system as described above of the present invention comprises the following steps:

[0056] (1) inserting a first positioning pin group into the bone through the positioning module, and removing the positioning module; specifically, fitting the bone surface fitting portion to the femoral condyle, and placing the first limiting teeth in the first semi-open guide cylinder 101, the second semi-open guide cylinder 102 and the third semi-open guide cylinder 103 corresponding to the axial arc-shaped grooves of the first positioning guide cylinder, the second positioning guide cylinder and the third positioning guide cylinder into their through holes, rotating the first positioning guide cylinder, the second positioning guide cylinder and the third positioning guide cylinder so that the first limiting teeth cooperate with the second limiting teeth; the first positioning pin, the second positioning pin and the third positioning pin are placed into the bone along the inner holes of the first positioning guide cylinder, the second positioning guide cylinder and the third positioning guide cylinder, rotating the first positioning guide cylinder, the second positioning guide cylinder and the third positioning guide cylinder so that the second limiting teeth are disengaged from the first limiting teeth, and taking out the first positioning guide cylinder, the second positioning guide cylinder and the third positioning guide cylinder along the axial direction, and then removing the positioning module through the dislocation groove, and the first positioning pin, the second positioning pin and the third positioning pin remain on the bone;

[0057] (2) installing the bone cutting navigation module and the positioning frame to the surgical site under the positioning of the first positioning pin group, specifically placing the bone cutting navigation module and the positioning frame, wherein the first positioning pin is located in a guide hole of the bone cutting navigation module, and the second positioning pin and the third positioning pin are located in the first limiting sleeve and the second limiting sleeve of the positioning frame;

[0058] (3) inserting a second positioning nail group into the bone under the guidance of the guide hole 211 of the bone cutting navigation module, inserting a fourth positioning nail, a fifth positioning nail and a sixth positioning nail, and removing the first positioning nail group and the positioning frame;

[0059] (4) Bone cutting: remove the second positioning pin group and the bone cutting guide module to complete the bone cutting.

[0060] The advantages and positive effects of the present invention are as follows: the present invention provides a femoral condyle horizontal bone cutting system, which not only retains the advantages of customized surgical instruments with high positioning accuracy and good adaptability, but also retains the advantages of standard instruments with convenient bone cutting, wide application range and high reliability; simplifies the function and structure of customized surgical instruments, reduces the design workload, and reduces the manufacturing cost; and reduces the damage to the patient's bone caused by surgery.

[0061] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A femoral condyle horizontal osteotomy system, characterized in that: It comprises a positioning module, a bone cutting navigation module and a positioning frame; wherein the positioning module comprises a bone surface fitting part and a nail group guiding mechanism, the bone surface fitting part is obtained by reverse design according to the surface shape of the femoral condyle of the patient, and the nail group guiding mechanism is arranged on the bone surface fitting part, and is used to guide the first positioning nail group to be inserted into the bone; the bone cutting navigation module is connected to the positioning frame, the bone cutting navigation module and the positioning frame pass through the first positioning nail group, and the bone cutting navigation module comprises a navigation body and a bone cutting groove and a guide hole arranged on the navigation body; The nail group guiding mechanism comprises a first semi-open guide cylinder, a second semi-open guide cylinder and a third semi-open guide cylinder respectively arranged at the front side, the distal inner side and the distal outer side of the bone surface fitting part, the position of the first semi-open guide cylinder relative to the bone surface fitting part is determined according to the position of the guide hole of the bone cutting navigation module, and the position of the bone cutting navigation module during the operation is determined by the position of the horizontal bone cutting surface of the femoral condyle planned before the operation; the positions of the second semi-open guide cylinder and the third semi-open guide cylinder relative to the bone surface fitting part are determined by the placement positions of the bone cutting navigation module and the positioning frame during the operation; The positioning module is a customized product, and the bone cutting navigation module and the positioning frame are standard products; when used for different patients, the bone surface fitting part, the first semi-open guide cylinder, the second semi-open guide cylinder and the third semi-open guide cylinder form a customized component.

2. The femoral condyle horizontal osteotomy system according to claim 1, characterized in that: The area where the bone surface fitting portion fits the bone surface extends from the anterior condyle along the trochlear groove to the distal end of the femoral condyle, and extends backwards along the inner and outer sides from the intercondylar fossa respectively, forming a shape that completely matches the morphology of the femoral condyle.

3. The femoral condyle horizontal osteotomy system according to claim 2, characterized in that: The first semi-open guide cylinder, the second semi-open guide cylinder and the third semi-open guide cylinder are detachably connected with the first positioning guide cylinder, the second positioning guide cylinder and the third positioning guide cylinder. The first positioning nail group includes the first positioning nail, the second positioning nail and the third positioning nail. The first positioning nail, the second positioning nail and the third positioning nail are respectively inserted into the bone through the first positioning guide cylinder, the second positioning guide cylinder and the third positioning guide cylinder.

4. The femoral condyle horizontal osteotomy system according to claim 3, characterized in that: An axial dislocation groove is respectively provided on the proximal side of the first semi-open guide cylinder and the rear side of the second semi-open guide cylinder and the third semi-open guide cylinder, and the dislocation groove extends along the cylinder wall of the first semi-open guide cylinder, the second semi-open guide cylinder and the third semi-open guide cylinder to the edge of the bone surface fitting portion.

5. The femoral condyle horizontal osteotomy system according to claim 4, characterized in that: A plurality of first limiting teeth are axially arranged on the inner cylinder wall of the first semi-open guide cylinder, the second semi-open guide cylinder and the third semi-open guide cylinder on the side opposite to the dislocation groove, and a second limiting teeth matching with the first limiting teeth are provided on the outer cylinder wall of the first positioning guide cylinder, the second positioning guide cylinder and the third positioning guide cylinder.

6. The femoral condyle horizontal osteotomy system according to claim 3, characterized in that: The inner and outer sides of the navigation body are bent backwards and symmetrical to each other, the guide hole is arranged at the upper part of the navigation body, the bone cutting groove is arranged at the lower part of the guide hole, the axial direction of the guide hole is perpendicular to the outer wall surface of the navigation body, and the second positioning nail group and the first positioning nail pass through the guide hole.

7. The femoral condyle horizontal osteotomy system according to claim 1, characterized in that: The positioning frame includes a main body, a first limiting column, a second limiting column, a first limiting sleeve and a second limiting sleeve. One end of the main body is provided with the first limiting column and the second limiting column through a cantilever, and the other end of the main body is provided with the first limiting sleeve and the second limiting sleeve through a cantilever.

8. The femoral condyle horizontal osteotomy system according to claim 7, characterized in that: The bottom surface of the navigation body is provided with a first limiting hole and a second limiting hole in parallel along the inner and outer directions, and the first limiting column and the second limiting column are respectively plugged into the first limiting hole and the second limiting hole.

9. The femoral condyle horizontal osteotomy system according to claim 5, characterized in that: The first limiting tooth and the second limiting tooth are both arc-shaped limiting teeth, the adjacent tooth spacing between the first limiting teeth and the second limiting teeth is 0.5-1.2mm, and the tooth height of the first limiting tooth and the second limiting tooth is 0.2-1mm; and the outer diameters of the first positioning guide cylinder, the second positioning guide cylinder and the third positioning guide cylinder are greater than the width of the dislocation groove; the width of the dislocation groove is greater than the diameters of the first positioning pin, the second positioning pin and the third positioning pin.

Images