Fixing device for hip replacement surgery

Abstract

The invention relates to the technical field of medical auxiliary instruments, in particular to a fixing device for hip replacement surgery, which comprises a femoral head prosthesis and an auxiliary fixing plate, the femoral head prosthesis and the auxiliary fixing plate are matched and fixed through the mounting holes; a prosthesis extension part is mounted at the lower end of the femoral head prosthesis; the total length of the auxiliary fixing plate is matched with the length of the prosthesis extension part, so that the overall length of the fixing device is changed. The combined fixing device based on the femoral head prosthesis and the auxiliary fixing plate aims at solving the problem that in the prior art, the fixed length of the femoral head prosthesis is not convenient to use, and a replaceable prosthesis extension part is arranged at the tail end of the femoral head prosthesis in the fixing device; the length and the shape can be changed at will by adjusting the prosthesis extension part so as to meet the corresponding replacement requirement and the inner space of the femoral marrow cavity, meanwhile, the combined structure is further fixed through the auxiliary fixing plate, and the structural strength is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical auxiliary equipment, and in particular to a fixing device used in hip replacement surgery. Background Art

[0002] Hip replacement, also known as artificial hip replacement, is an artificial prosthesis, including the femoral part and the acetabulum part, which is fixed to normal bone with bone cement and screws to replace the diseased joint and reconstruct the normal function of the patient's hip joint. It is a relatively mature and reliable treatment method. In the early days, artificial joints only replaced the artificial femoral head, commonly known as hemi-hip replacement, and later developed into total hip replacement. Total hip replacement mainly refers to the complete replacement process of the patient's femoral head by implanting a prosthesis. The total length of the implanted prosthesis usually passes over the greater and lesser trochanters of the femoral head, reaches the lower femoral body, and penetrates into the femoral medullary cavity. It is tightly combined with the bone through fixing devices, such as screws, to form a new mechanical transmission structure, thereby replacing the damaged joint.

[0003] In the prior art, there are many prostheses for hip replacement.

[0004] For example, Chinese patent CN201710159261.1 discloses a modular femoral prosthesis used during hip revision surgery, comprising an implantable distal stem component, the implantable distal stem component having a tapered column formed in the outer surface of the distal stem component, the tapered column configured to be accommodated in a tapered bore of an implantable proximal body component, a set of upper internal threads, the set of upper internal threads having an upper end leading to the upper surface of the distal stem component, the set of upper internal threads extending downward into the distal stem component, and a set of lower internal threads, the set of lower internal threads having an upper end leading to the lower end of the set of upper internal threads, the set of lower internal threads extending downward from the set of upper internal threads, wherein the diameter of the set of upper internal threads is greater than the diameter of the set of lower internal threads.

[0005] However, during the actual implementation process, the inventors found that since most prostheses are manufactured in an integrated process, they cannot be adjusted accordingly according to the patient's body shape and injury conditions, and their applicability is not high. Summary of the invention

[0006] In view of the above problems existing in the prior art, a fixation device for hip replacement surgery is now provided.

[0007] The specific technical solutions are as follows:

[0008] A fixation device for hip replacement surgery, comprising a femoral head prosthesis and an auxiliary fixation plate;

[0009] The femoral head prosthesis and the auxiliary fixing plate are fixedly matched through the mounting holes;

[0010] A prosthesis extension part is installed at the lower end of the femoral head prosthesis;

[0011] The total length of the auxiliary fixing plate matches the length of the prosthesis extension part to change the overall length of the fixing device.

[0012] On the other hand, a plurality of the mounting holes are respectively formed in the front surface of the femoral body of the femoral head along the long axis direction;

[0013] The auxiliary fixing plate is arranged along the long axis direction of the femoral body;

[0014] The cross section of the auxiliary fixing plate is in a shape of a capital "J";

[0015] The first part of the auxiliary fixing plate is arranged along the front surface of the femoral body, and the second part of the auxiliary fixing plate is fixedly connected to the upper part of the greater trochanter of the femoral head prosthesis.

[0016] On the other hand, the prosthesis extension part is located at the lower end of the femoral body of the femoral head prosthesis;

[0017] An insertion block is arranged at the lower end of the femoral body, and a socket matching the insertion block is arranged at the upper end of the prosthesis extension part;

[0018] The insertion block is in an inverted trapezoid shape with a wider upper part and a narrower lower part in the front view direction and extends downward from the lower end of the femoral body;

[0019] The socket is a hollow sheath-like structure formed at the top end of the prosthesis extension part;

[0020] The insertion block is inserted into the socket and fixed.

[0021] On the other hand, the left and right sides of the insertion block extend downward and are respectively provided with a pair of outwardly extending racks;

[0022] Tooth grooves matching the racks are arranged at the positions of the inner side walls on the left and right sides of the socket corresponding to the racks;

[0023] The racks are inserted into the tooth grooves to fix the prosthesis extension part.

[0024] On the other hand, reinforcing ribs are respectively arranged on the front and back sides of the insertion block;

[0025] The upper ends of the reinforcing ribs are connected to the femoral body, and the left and right sides are respectively connected to the racks.

[0026] On the other hand, a pair of support rods are arranged at the ends of the racks along the horizontal direction;

[0027] Each of the support rods is in a herringbone shape, and both ends of the support rod are respectively connected to the inner side of the rack;

[0028] The tip portions of the support rods are arranged opposite to each other and enclose a clamping portion;

[0029] Both sides of the support rod are supported by elastic materials;

[0030] The prosthesis extension part is provided with a mounting hole as a terminal fixing hole at a corresponding position of the clamping part;

[0031] When the screw rod penetrates into the terminal fixing hole, the screw rod passes through the outer shell of the prosthesis extension part to reach the inner side of the prosthesis extension part and penetrates into the clamping part;

[0032] The upper and lower surfaces of the screw rod are abutted and fixed by the tip of the support rod.

[0033] On the other hand, a screw groove is provided at the tip of the support rod on one side close to the terminal mounting hole;

[0034] The screw groove abuts against the inner side of the head of the inserted screw rod.

[0035] On the other hand, a penetration groove is provided on the upper side of the greater trochanter;

[0036] The second portion of the auxiliary fixing plate is inserted into the insertion groove and fixed by a long screw to connect with the large rotor.

[0037] On the other hand, the end of the second portion of the auxiliary fixing plate is provided with an open portion;

[0038] The open portion extends downward and is split into two pieces, left and right;

[0039] When the middle part of the open part penetrates the long screw, the left and right ends of the open part are clamped into the large rotor for fixing.

[0040] On the other hand, the mounting holes are evenly spaced on the femoral body, and the uppermost mounting hole is located below the greater trochanter.

[0041] The above technical solution has the following advantages or beneficial effects:

[0042] In response to the problem in the prior art that the length of the femoral head prosthesis is not conducive to use, the present solution provides a combined fixing device based on a femoral head prosthesis and an auxiliary fixing plate. A replaceable prosthesis extension is provided at the end of the femoral head prosthesis in the fixing device. The length and shape of the prosthesis can be arbitrarily changed by adjusting the prosthesis extension to adapt to the corresponding replacement requirements and the inner space of the femoral medullary cavity. At the same time, the auxiliary fixing plate is used to further fix the combined structure, thereby improving the structural strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The embodiments of the present invention will be described more fully with reference to the attached drawings, which are provided for illustration and description only and are not intended to limit the scope of the present invention.

[0044] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0045] Figure 2 It is an exploded view of an embodiment of the present invention.

[0046] Figure 3 For the embodiment of the present invention Figure 2 Enlarged view of point A.

[0047] Figure 4 It is an exploded view of the extension part and the prosthesis according to an embodiment of the present invention.

[0048] Figure 5 The figure is an exploded view of the plugboard and the slot according to the embodiment of the present invention.

[0049] Figure 6 It is a schematic structural diagram of the bayonet according to an embodiment of the present invention.

[0050] Figure 7 2 is a cross-sectional view of a slide plate according to an embodiment of the present invention. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] 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.

[0053] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0054] The present invention comprises:

[0055] A fixing device for hip replacement surgery, as Figure 1-7 shown, comprising a femoral head prosthesis 1 and an auxiliary fixing plate 2;

[0056] The femoral head prosthesis 1 and the auxiliary fixing plate 2 are fixedly matched through the mounting holes 4;

[0057] A prosthesis extension part 3 is installed at the lower end of the femoral head prosthesis 1;

[0058] The total length of the auxiliary fixing plate 2 is matched with the length of the prosthesis extension part 3 to change the overall length of the fixing device.

[0059] Specifically, aiming at the problem that the fixed length of the femoral head prosthesis in the prior art is not conducive to use, in this solution, a combined fixing device based on the femoral head prosthesis 1 and the auxiliary fixing plate 2 is provided. Among them, the femoral head prosthesis 1 is a prosthesis including a complete femoral head, femoral neck, and femoral shaft. The bottom end of the femoral shaft is set as a removable prosthesis extension part 3 to adapt to the patient's bones of different lengths.

[0060] The prosthesis extension part 3 is an additional structure, which is used to be inserted into the femoral medullary cavity of the patient's femur and fixed by bolts, etc. Since the lengths and shapes of the femoral parts that the patient needs to remove are different, better adaptation to different patients can be achieved by making a series of prosthesis extension parts 3 for replacement, and the more complex femoral head and femoral neck parts are omitted, which is convenient for quick replacement.

[0061] Considering the problem of the decrease in structural strength caused by setting the prosthesis extension part 3 as a split structure, in this embodiment, an auxiliary fixing plate 2 is also provided. The auxiliary fixing plate 2 is a plate-like structure in a shape of a capital "J", and its upper end is inserted into the part of the greater trochanter for fixation. Since the greater trochanter part is located outside the pelvis after installation and has a large movement space, it is not easy to affect the patient's movement.

[0062] The lower end of the auxiliary fixing plate 2 is a plate-like structure, and a longer part can be processed during the pre-processing. After determining the actual required length, it is cut and polished, and then a plurality of mounting holes distributed thereon are matched with the femoral head prosthesis and fixed by bolts.

[0063] In one embodiment, a plurality of mounting holes 4 are respectively formed in the front surface of the femoral shaft of the femoral head prosthesis 1 along the long axis direction;

[0064] The auxiliary fixing plate 2 is arranged along the long axis direction of the femoral shaft;

[0065] The cross-section of the auxiliary fixing plate 2 is in the shape of a capital "J";

[0066] The first part of the auxiliary fixing plate 2 is arranged along the front surface of the femoral shaft, and the second part of the auxiliary fixing plate 2 is fixedly connected to the upper part of the greater trochanter of the femoral head prosthesis 1.

[0067] Specifically, considering the problem of reduced structural strength caused by setting the prosthesis extension part 3 as a split structure, an auxiliary fixing plate 2 is also provided in this embodiment. The auxiliary fixing plate 2 is a plate-like structure in a U-shape. Its upper end is inserted and fixed at the position of the greater trochanter. Since the greater trochanter is located outside the pelvis after installation and has a large movement space, it is not easy to affect the patient's movement.

[0068] The lower end of the auxiliary fixing plate 2 is a plate-like structure. During the pre-processing, a longer part can be processed. After determining the actual required length, it is cut and polished, and then a plurality of mounting holes distributed thereon are matched with the femoral head prosthesis and fixed with bolts.

[0069] In one embodiment, the prosthesis extension part 3 is located at the lower end of the femoral body of the femoral head prosthesis 1;

[0070] An insertion block 5 is provided at the lower end of the femoral body, and a socket 6 matching the insertion block 5 is provided at the upper end of the prosthesis extension part 3;

[0071] The insertion block 5 is trapezoidal with a wider upper part and a narrower lower part in the front view direction and extends downward from the lower end of the femoral body;

[0072] The socket 6 is a hollow sheath-like structure opened at the top end of the prosthesis extension part 3;

[0073] The insertion block 5 is inserted into the socket 6 and fixed.

[0074] Specifically, to achieve a better fixing effect, in this embodiment, an insertion block 5 is provided at the lower end of the femoral body. The insertion block 5 is a part that is more narrowed relative to the outer surface of the femoral body and extends downward, having a certain length and capable of being inserted into the socket 6 and fixed.

[0075] The socket 6 is a hollow sheath-like structure opened at the top end of the prosthesis extension part 3. An opening is provided at the top end of the prosthesis extension part 3, and a cavity part is provided inside.

[0076] When installing the two, the insertion block 5 is inserted into the socket 6 and fixed. Fixing holes are provided on the outside of the prosthesis extension part 3, and bolts are inserted through the fixing holes and fixed. At this time, the extending part of the insertion block 5 is inserted into the socket 6 to provide restraint in the horizontal plane.

[0077] In one embodiment, fixing rods 7 extend downward from the left and right sides of the insertion block 5, and a pair of outward rack teeth 8 are respectively provided on the outer sides of the fixing rods 7;

[0078] On the inner side walls of the socket 6 on the left and right sides, tooth grooves 16 matching the rack teeth 8 are provided at positions corresponding to the rack teeth 8;

[0079] The rack teeth 8 are inserted into the tooth grooves 16 to fix the prosthesis extension part 3.

[0080] Specifically, in order to achieve a better fixing effect, in this embodiment, fixing rods 7 are extended downward on the left and right sides of the insert block 5. The fixing rods 7 have a relatively long length, so when inserted into the socket 6, a relatively stable installation effect can be achieved.

[0081] At the same time, in order to prevent the extended part of the prosthesis from being displaced downward in the vertical direction, in this embodiment, a pair of outward racks 8 are provided on the outside of the fixing rod 7, and tooth grooves 16 matching the racks 8 are provided on the inner walls of the left and right sides of the socket 6 corresponding to the racks 8.

[0082] The rack 8 is a set of unidirectional oblique teeth, the lower end surface of which is an inclined surface and the upper end surface is a plane; correspondingly, the tooth groove 16 has the same structure. The fixing rod 7 is made of a material with a certain elasticity.

[0083] When the insert block 5 is inserted into the socket 6, the fixing rod 7 will be slightly deformed inward because the rack 8 will be pushed by the tooth groove 16 until the rack 8 is inserted to the end and fixed with the tooth groove 16. At this time, if the prosthesis extension part 3 is pulled out in the reverse direction, the rack 8 will abut against the tooth groove 16 to fix it.

[0084] In one embodiment, the insert block 5 is provided with reinforcing ribs on both the front and back sides;

[0085] The upper end of the reinforcing rib is connected to the femoral body, and the left and right sides are respectively connected to the fixing rods 7.

[0086] Specifically, in order to achieve better structural stability, in this embodiment, a pair of reinforcing rib structures are provided between the fixing rods 7 distributed on the left and right sides.

[0087] The reinforcing rib extends downward from the lower end of the femoral body and has a smaller diameter than the surface of the femoral body. The left and right sides are respectively connected to the fixing rod 7 so that the end portion of the fixing rod 7 is constrained in the left and right directions and will not be further deformed.

[0088] In one embodiment, a pair of support rods 9 are provided at the end of the fixing rod 7 in the horizontal direction;

[0089] Each support rod 9 is in a herringbone shape, and both ends of the support rod 9 are respectively connected to the inner side of the rack;

[0090] The tip portions of the support rods 9 are arranged opposite to each other and enclose to form a clamping portion;

[0091] Both sides of the support rod 9 are supported by elastic material as deformation areas 10;

[0092] The prosthesis extension part 3 is provided with a mounting hole 4 as a terminal fixing hole at a corresponding position of the clamping part;

[0093] When the screw rod penetrates into the terminal fixing hole, the screw rod passes through the outer shell of the prosthesis extension part 3 to reach the inner side of the prosthesis extension part and penetrates into the clamping part;

[0094] The upper and lower surfaces of the screw rod are butted and fixed by the tip of the support rod.

[0095] Specifically, in order to achieve a better fixation effect on the prosthesis extension 3, in this embodiment, a mounting hole 4 is set on the outside of the socket 6 as a terminal fixing hole, and a plurality of mounting holes 4 are set at the position of the femoral body.

[0096] When the screw is inserted, it will be inserted into the mounting holes 4 and threadedly tightened. At this time, the upper femoral body and the lower prosthetic extension 3 will be fixed by the outer auxiliary fixation plate 2 and form a stable mechanical transmission path, which can achieve longitudinal support and lateral torsion resistance.

[0097] At the same time, considering that the prosthesis extension part 3 is hollowed out to form a sheath-like structure, the structural strength of the position of the mounting hole 4 opened on the prosthesis extension part 3 is reduced to a certain extent. In order to achieve the reinforcement of the structural strength of this part, in this embodiment, a pair of support rods 9 are arranged at the end of the fixing rod 7 in the horizontal direction, each support rod 9 is in a herringbone shape, and the two ends of the support rod 9 are respectively connected to the inner side of the rack as a deformation area 10, so that the clamping part in the middle of the support rod 9 can be deformed to a certain extent in the height direction with the external force.

[0098] When a pair of support rods 9 are provided, the protruding parts of the support rods 9 are arranged relative to each other, so that the extension lines of the deformation areas 10 intersect in an X shape, the middle part is the clamping part, and the position of the clamping part corresponds to the position of the mounting hole 4.

[0099] When the screw is inserted, since the tip of the screw is pointed or rounded, with a narrowed and increased diameter portion, it will be embedded in the clamping portion to open the support rod 9, and the deformed portion 10 will bend outward and provide a certain deflection, so that the clamping portion can press the middle screw to provide additional structural force and fixing effect.

[0100] When the prosthesis extension part 3 is twisted by external force, the force on this part is borne by the support rod 9 and the outer shell of the prosthesis extension part 3, thereby reinforcing the structural strength.

[0101] In one embodiment, a screw groove 11 is provided at the tip of the support rod 9 on one side close to the terminal mounting hole;

[0102] The screw groove 11 abuts against the inner side of the head of the inserted screw.

[0103] Specifically, in order to achieve a better matching effect between the screw and the support rod 9, in this embodiment, the head of the screw is set to a spherical structure. When screwed into the mounting hole 4, a part of the spherical part at the bottom of the screw passes through the mounting hole 4 to the inside;

[0104] At the same time, a screw groove 11 is provided at the tip of the support rod 9 on one side close to the end mounting hole. The screw groove 11 also has a similar spherical surface. When the screw is screwed in, it can abut against the protruding spherical surface to provide additional anti-torsion properties.

[0105] In one embodiment, a penetration groove 13 is provided above the greater rotor;

[0106] The second portion 12 of the auxiliary fixing plate 2 is inserted into the insertion groove 13 and fixed by a long screw to connect with the large rotor.

[0107] Specifically, in order to achieve a better installation effect of the auxiliary fixing plate, in this embodiment, a rectangular insertion groove 13 is opened above the greater trochanter, and the long strip-shaped auxiliary fixing plate 2 is set in a "J" shape, wherein the front side slightly passes over the greater trochanter, and then bends downward to form the second part 12, and the second part 12 penetrates into the groove 13 from the top of the greater trochanter downward, thereby achieving a better fixing effect;

[0108] At the same time, in order to further fix the two parts, in this embodiment, a hole is opened on the second part 12 along the long axis direction, and a corresponding screw hole is provided in the middle part of the groove 13;

[0109] When the second portion 12 of the auxiliary fixing plate 2 is inserted into the insertion groove 13, the middle portion is penetrated by the long screw, and the long screw fixes the auxiliary fixing plate 2 and the inside of the large rotor respectively through threads, thereby achieving a stable connection.

[0110] In one embodiment, the end of the second portion 12 of the auxiliary fixing plate 2 is provided with an open portion 14;

[0111] The open portion 14 extends downward and is split into two left and right pieces;

[0112] When the middle portion of the open portion 14 is inserted into the long screw, the left and right ends of the open portion 14 are clamped into the large rotor for fixation.

[0113] Specifically, in order to further improve the connection strength of the connection of the auxiliary fixing plate 2, in this embodiment, an open portion 14 is provided at the end of the second portion 12 of the auxiliary fixing plate 2, and the open portion 14 extends downward and is split into two left and right pieces. The distance between the two open portions 14 is smaller than the diameter of the bolt hole opened on the second portion 12. When the bolt moves between the two open portions 14, the two open portions 14 can be pushed open, and a bayonet 15 matched with the open portion 14 is provided on the groove wall of the penetration groove 13. When the open portion 14 is inserted into the penetration groove 13, the open portion 14 will be engaged with the bayonet 15. At this time, the second portion 12 and the penetration groove 13 are pre-fixed, which is convenient for medical staff to install the bolts. After the bolts are installed, the open portion 14 is pushed open by the bolts and can be more stably engaged with the bayonet 15.

[0114] In one embodiment, the mounting holes 4 are evenly spaced on the femoral body, and the uppermost mounting hole is located below the greater trochanter.

[0115] Specifically, in order to achieve a better fixation effect, in this embodiment, a plurality of mounting holes 4 are arranged at equal intervals on the femoral body to achieve effective fixation of the femoral body prosthesis 1 and the auxiliary fixation plate 2, and the uppermost mounting hole is controlled to be located below the greater trochanter, and the end mounting hole is located in the cavity part of the prosthesis extension 3 to achieve a better installation effect.

[0116] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A fixation device for hip replacement surgery, characterized in that: It includes a femoral head prosthesis and an auxiliary fixing plate; The femoral head prosthesis and the auxiliary fixing plate are fixedly matched through mounting holes; A prosthesis extension part is installed at the lower end of the femoral head prosthesis; The total length of the auxiliary fixing plate matches the length of the prosthesis extension part to change the overall length of the fixing device.

2. The fixing device according to claim 1, characterized in that: A plurality of the mounting holes are respectively formed in the front surface of the femoral body of the femoral head prosthesis along the long axis direction; The auxiliary fixing plate is arranged along the long axis direction of the femoral body; The cross-section of the auxiliary fixing plate is in a shape of "ji"; The first part of the auxiliary fixing plate is arranged along the front surface of the femoral body, and the second part of the auxiliary fixing plate is fixedly connected to the upper part of the greater trochanter of the femoral head prosthesis.

3. The fixing device according to claim 1, characterized in that: The prosthesis extension part is located at the lower end of the femoral body of the femoral head prosthesis; An inserting block is arranged at the lower end of the femoral body, and a socket matching the inserting block is arranged at the upper end of the prosthesis extension part; The inserting block is in an inverted trapezoid shape with a wider upper part and a narrower lower part in the front view direction and extends downward from the lower end of the femoral body; The socket is a hollow sheath-like structure formed at the top end of the prosthesis extension part; The inserting block is inserted into the socket and fixed.

4. The fixing device according to claim 3, characterized in that: Fixing rods extend downward from the left and right sides of the inserting block, and a pair of outward-facing racks are respectively arranged on the fixing rods; Tooth grooves matching the racks are arranged at the positions corresponding to the racks on the inner side walls on the left and right sides of the socket; The racks are inserted into the tooth grooves to fix the prosthesis extension part.

5. The fixing device according to claim 4, characterized in that: Reinforcing ribs are respectively arranged on the front and back sides of the inserting block; The upper end of the reinforcing rib is connected to the femoral body, and the left and right sides are respectively connected to the fixing rods.

6. The fixing device according to claim 4, characterized in that: A pair of support rods are arranged at the ends of the fixing rods along the horizontal direction; Each support rod is in a shape of "ren", and the two ends of the support rod are respectively connected to the inner side of the fixing rod; The tip parts of the support rods are arranged oppositely and enclose to form a clamping part; The two sides of the support rod are supported by elastic materials; An installation hole is arranged at the corresponding position of the prosthesis extension part in the clamping part as an end fixing hole; When a screw penetrates into the end fixing hole, the screw passes through the outer shell of the prosthesis extension part to reach the inner side of the prosthesis extension part and penetrates into the clamping part; The upper and lower surfaces of the screw are fixed by being abutted against the tip parts of the support rods.

7. The fixing device according to claim 6, characterized in that: A screw groove is arranged on the side of the tip part of the support rod close to the end installation hole; The screw groove abuts against the inner side of the head of the screw penetrating in.

8. The fixing device according to claim 2, characterized in that: A penetrating groove is formed above the greater trochanter; The second part of the auxiliary fixing plate penetrates into the penetrating groove and is fixed by a long screw to connect to the greater trochanter.

9. The fixing device according to claim 8, characterized in that: An opening part is arranged at the end of the second part of the auxiliary fixing plate; The opening part extends downward and splits into left and right two pieces; When the middle part of the opening part penetrates into the long screw, the left and right ends of the opening part are clamped into the greater trochanter for fixation.

10. The fixing device according to claim 2, characterized in that: The mounting holes are equally spaced on the femoral body, and the uppermost mounting hole is located below the greater trochanter.

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