A proximal insertion point positioning and navigation device for femoral intramedullary nail

Abstract

A proximal needle insertion point positioning and navigation device for a femoral intramedullary nail comprises a buckle and a vertical rod, a first needle rod clamp and a rod rod clamp are slidably provided on the vertical rod, a cross rod perpendicular to the vertical rod is slidably provided on the rod rod clamp, the cross rod is also slidably connected to the second needle rod clamp, an anteroposterior guide needle perpendicular to the cross rod is slidably provided on the second needle rod clamp, the first needle rod clamp is also slidably connected to one end of the lateral guide needle, and the lateral guide needle and the anteroposterior guide needle are arranged parallel to each other, the other end of the lateral guide needle is connected to one end of the regulator, a transverse guide needle perpendicular to the lateral guide needle is slidably provided on the regulator, the other end of the regulator is connected to the positioning rod, a hollow positioning guide is installed in the sliding hole of the positioning rod, the front end of the hollow positioning guide is bent and extended toward the tip of the transverse guide needle, and a guide needle channel is provided in the hollow positioning guide; by means of the above technical scheme, the present invention can shorten the operation time, reduce the number of fluoroscopy times, the amount of intraoperative bleeding and the length of the incision.

Description

Technical Field

[0001] The invention relates to the field of orthopedic medical devices, and in particular to a proximal needle insertion point positioning and navigation device for a femoral intramedullary nail. Background Art

[0002] Intramedullary nailing technology has been used in clinical practice for nearly half a century. Due to its advantages of minimally invasive, less damage to the periosteal blood supply, and reliable fixation, it has been widely adopted by orthopedic surgeons at home and abroad, especially for the treatment of intertrochanteric fractures and femoral fractures. Closed reduction intramedullary nailing technology has completely surpassed the traditional open reduction plate and screw fixation technology. Since intramedullary nailing technology requires the entire surgical operation to be completed under the guidance of X-ray fluoroscopy without exposing (or with limited exposure) the fracture end, during the entire surgical operation of antegrade femoral intramedullary nailing, the operation of placing the intramedullary nail guide is often the most critical, requiring a large amount of fluoroscopy. Once there is a deviation, it will affect the entire subsequent surgical operation, and the long-term accumulated radiation damage should not be underestimated.

[0003] The two most commonly used methods of proximal femoral intramedullary nailing in clinical practice are the pyriform sinus nailing and the greater trochanter apex nailing. The location of the greater trochanter nailing point is relatively lateral, with obvious bone landmarks, which is convenient for surgical operation and avoids proximal femoral fracture during nailing. In addition, nailing at the greater trochanter apex can reduce the operation time and intraoperative bleeding. After selecting the junction of the anterior and middle 1 / 3 of the tip of the greater trochanter as the nailing point, it is difficult to successfully place the intramedullary nail guide needle into the ideal position. At present, clinical physicians usually cut the skin and subcutaneous tissue, separate the gluteus medius muscle, touch the tip of the greater trochanter with their fingers, and then introduce the guide needle. However, this operation will increase bleeding and increase the risk of infection due to the guide needle piercing the sterile gloves.

[0004] In clinical work, it is found that the selection of the proximal entry point of the femoral intramedullary nail is the key to intramedullary nail fixation. If the entry point is not selected properly, it is easy to cause loss of reduction and fixation failure. In clinical practice, the body surface marking line is selected to assist in the selection of the entry point and route. The femoral midline is marked on the body surface, and the intramedullary nail guide needle is minimally invasively implanted with reference to the external marking line, which shortens the operation time and reduces surgical trauma and bleeding. However, this method requires rich operating experience and is difficult for novices to learn. Summary of the invention

[0005] In view of the above technical problems, the purpose of the present invention is to provide a proximal insertion point positioning and navigation device for a femoral intramedullary nail, which can shorten the operation time, reduce the number of fluoroscopy times, intraoperative bleeding volume and incision length.

[0006] The purpose of the present invention is achieved by the following technical solutions. A proximal insertion point positioning and navigation device for a femoral intramedullary nail according to the present invention comprises a buckle fixed on an operating table and a vertical rod mounted on the buckle and slidably arranged in a vertical direction, the vertical rod is slidably arranged with a first needle bar clamp and a rod-rod clamp from bottom to top in sequence, a cross bar perpendicular to the vertical rod is slidably arranged on the rod-rod clamp, the cross bar is also slidably connected to the second needle bar clamp, an anteroposterior guide needle perpendicular to the cross bar is slidably arranged on the second needle bar clamp, the first needle bar clamp is also slidably connected to one end of the lateral guide needle, and the lateral guide needle and the anteroposterior guide needle are arranged parallel to each other, and the other end of the lateral guide needle is slidably connected to the lateral guide needle. One end of the regulator is connected, and a transverse guide needle is slidably provided on the regulator, which is in the same horizontal plane as the lateral guide needle and perpendicular to each other. The other end of the regulator is connected to the positioning rod, and a hollow positioning guide is installed in the sliding hole opened at the proximal end of the positioning rod, which is in the same horizontal plane as the transverse guide needle. The front end of the hollow positioning guide is bent and extended toward the tip of the transverse guide needle. A guide needle channel is provided in the hollow positioning guide, and the entrance of the guide needle channel is opened on the side of the hollow positioning guide away from the transverse guide needle, and the exit is arranged at the front end of the hollow positioning guide and the direction of the exit is perpendicular to the length direction of the transverse guide needle.

[0007] The present invention is further implemented by the following technical solutions.

[0008] The aforementioned femoral intramedullary nail proximal needle entry point positioning and navigation device, wherein the clip includes an integrally formed C-clamp and a vertical rod clamp block, the bottom of the C-clamp is threadedly connected to a locking screw for fixing the C-clamp to the side of the operating table, the vertical rod clamp block is provided with a mounting hole for the vertical rod to pass through and a threaded hole connected to the mounting hole, and a locking bolt for pressing the vertical rod into position is provided in the threaded hole.

[0009] The aforementioned proximal insertion point positioning and navigation device for the femoral intramedullary nail, wherein the rod clamp comprises a first clamping part, a second clamping part and a central axis installed in the first clamping part and the second clamping part, the first clamping part comprises a first clamping block and a second clamping block which are interlocked with each other, the second clamping part comprises a third clamping block and a fourth clamping block which are interlocked with each other, the bottom end of the central axis is provided with a limiting boss which cooperates with the fourth clamping block to stop and an external thread which cooperates with the internal thread of the fourth clamping block, a spring which is sleeved on the central axis is provided between the second clamping block and the third clamping block, and the contact surface of the second clamping block and the third clamping block is provided. The top of the central shaft is fixed with a knob which cooperates with the first clamping block in the axial direction, the first clamping block and the second clamping block are provided with a corresponding first arc surface groove at their junction to form a first clamping hole for clamping the horizontal rod, the third clamping block and the fourth clamping block are provided with a corresponding second arc surface groove at their junction to form a second clamping hole for clamping the vertical rod, the first clamping part and the second clamping part can rotate relative to each other around the central axis to facilitate the adjustment of the angle between the first clamping hole and the second clamping hole; the structure of the first needle bar clamp and the second needle bar clamp is the same as the rod clamp structure.

[0010] The aforementioned proximal femoral intramedullary nail needle insertion point positioning and navigation device, wherein the knob is detachably connected to the top end of the central axis.

[0011] The aforementioned proximal needle entry point positioning and navigation device for the femoral intramedullary nail, wherein one end of the regulator is provided with a first blind hole for inserting a lateral guide needle and a first locking hole connected to the first blind hole, the other end is provided with a second blind hole for inserting a positioning rod and a second locking hole connected to the second blind hole, and the middle part of the regulator is provided with a through hole for inserting a transverse guide needle and a third locking hole connected to the through hole.

[0012] The aforementioned proximal femoral intramedullary nail needle insertion point positioning and navigation device, wherein the front end of the hollow positioning guide is in the shape of a quadrangular pyramid.

[0013] In the aforementioned proximal insertion point positioning and navigation device for the femoral intramedullary nail, the sliding portion of the hollow positioning guide in the sliding hole and the front end body form a stepped shaft.

[0014] The aforementioned proximal femoral intramedullary nail needle insertion point positioning and navigation device, wherein the sliding portion is cylindrical or rectangular.

[0015] Compared with the prior art, the present invention visually marks the femoral medullary cavity through the anteroposterior and lateral views, presents virtual lines and points to the operator through a specific device, and further accurately locates the needle insertion point through a transverse guide needle that is in the same horizontal plane as the lateral guide needle and is perpendicular to each other, and then uses a hollow positioning guide to introduce the intramedullary nail guide needle, thereby increasing the accuracy of the surgical target, being simple and quick to operate, shortening the operation time, and reducing the number of fluoroscopy times, intraoperative bleeding, and incision length.

[0016] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following specifically cites a preferred embodiment and describes it in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a stereoscopic diagram of an embodiment of a proximal insertion point positioning and navigation device for a femoral intramedullary nail according to the present invention;

[0018] Figure 2 for Figure 1 A three-dimensional view of the middle pole clamp;

[0019] Figure 3 for Figure 1 Cross-section of the middle rod clamp;

[0020] Figure 4 for Figure 1 A cross-sectional view of the first needle bar clamp;

[0021] Figure 5 for Figure 1 A partial view of the hollow center positioning guide;

[0022] Figure 6 for Figure 1 A three-dimensional image of the middle buckle;

[0023] Figure 7 for Figure 1 A perspective view of the middle regulator;

[0024] Figure 8 for Figure 1 It is a partial schematic diagram after the intramedullary nail guide needle is installed in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0026] A specific implementation example of the proximal insertion point positioning and navigation device for a femoral intramedullary nail of the present invention is as follows: Figures 1 to 8 As shown, it includes a buckle 3, a vertical rod 4, a horizontal rod 7, an anteroposterior guide pin 9, a lateral guide pin 10, a transverse guide pin 12, a guide positioning rod 13 and a hollow positioning guide 14; the buckle 3 includes an integrally formed C-type clamp 301 and a vertical rod clamp 302, and a positioning screw 1 is provided at the bottom of the C-type clamp 301. When the opening of the C-type clamp 301 is clamped on the side bed frame of the operating bed, the positioning screw 1 is rotated to make it cooperate with the bottom thread of the C-type clamp and then press against the operating bed to achieve clamping and positioning of the C-type clamp; in addition, the C-type clamp structure is designed to slide along the length direction of the operating bed to facilitate adjustment of the overall position of the present invention to adapt to different operating environments. The vertical rod clamp 302 is provided with a mounting hole 303 in the vertical direction and a threaded hole 304 in the horizontal direction. The threaded hole 304 is connected to the mounting hole 303. The bottom end of the vertical rod 4 is slidably arranged in the mounting hole 303. After the vertical rod 4 is adjusted to a suitable installation height, the locking bolt 2 matched with the threaded hole is screwed and pressed against the vertical rod 4 to fix the vertical rod 4. Preferably, the positioning screw 1 is an L-shaped screw, and the locking bolt 2 is a V-shaped bolt with a V-shaped handle.

[0027] The vertical rod 4 located above the buckle 3 is slidably provided with a first needle rod clamp 5 and a rod rod clamp 6 in sequence from bottom to top. A cross bar 7 perpendicular to the vertical rod 4 is slidably provided on the rod rod clamp 6. The other end of the cross bar 7 is also slidably connected to the second needle rod clamp 8. The second needle rod clamp 8 is slidably provided with an anteroposterior guide pin 9 perpendicular to the cross bar 7. The first needle rod clamp 5 is also slidably connected to one end of a lateral guide pin 10, and the lateral guide pin 10 and the anteroposterior guide pin 9 are arranged parallel to each other in the length direction of the femur. The other end of the lateral guide pin 10 is connected to one end of an adjuster 11. A transverse guide pin 12 perpendicular to the lateral guide pin 10 is slidably provided on the adjuster 11. The central axis of the lateral guide pin 10 and the central axis of the transverse guide pin 12 are in the same horizontal plane. The adjuster is also One end is connected to the positioning rod 13, and a hollow positioning guide 14 which is in the same horizontal plane as the transverse guide needle 12 is slidably installed in the sliding hole 1301 opened at the proximal end of the positioning rod 13, and the front end of the hollow positioning guide 14 is bent and extended toward the tip of the transverse guide needle 12, and a guide needle channel 141 is provided in the hollow positioning guide 14, and the entrance 1411 of the guide needle channel 141 is opened on the side of the hollow positioning guide 14 away from the transverse guide needle 12 to facilitate the insertion of the intramedullary nail guide needle 15, and the exit 1412 is set at the front end of the hollow positioning guide 14, and the direction of the exit is perpendicular to the length direction of the transverse guide needle 12 when the present invention is adjusted to a suitable needle insertion state, so as to facilitate the precise introduction of the intramedullary nail guide needle 15 along the mid-axis of the femur.

[0028] In the present embodiment, the first needle bar clamp 5, the second needle bar clamp 8 and the rod-rod clamp 6 have the same structure, and can realize the angle adjustment and locking positioning between the needle and the rod, and between the rods. Here, only the structure of the rod-rod clamp 6 is described; specifically, the rod-rod clamp 6 includes a first clamping portion 61, a second clamping portion 62 and a center axis 64 passed through the first clamping portion and the second clamping portion. The first clamping portion includes a first clamping block 611 and a second clamping block 612 that are interlocked with each other, and the second clamping portion includes a third clamping block 621 and a fourth clamping block 622 that are interlocked with each other. The interlocking can be achieved by setting a protrusion on the second clamping block and a matching groove on the first clamping block to ensure the synchronous rotation of the first and second clamping blocks and the separation or guided interlocking along the axial direction of the center axis. The bottom end of the central shaft 64 is provided with a limiting boss 641 that cooperates with the fourth clamping block and an external thread 642 that cooperates with the internal thread of the fourth clamping block. A spring 63 is provided between the second clamping block 612 and the third clamping block 621 and is sleeved on the central shaft. The contact surfaces of the second clamping block 612 and the third clamping block 621 are provided with anti-slip teeth 65 that cooperate with each other. A knob 66 ​​that cooperates with the first clamping block 611 in the axial direction is fixedly provided at the top of the central shaft. The knob is detachably connected to the top of the central shaft through threaded cooperation. The first clamping block 611 and the second clamping block 612 are provided with a spring 63 that is sleeved on the central shaft. The contact surfaces of the second clamping block 612 and the third clamping block 621 are provided with anti-slip teeth 65 that cooperate with each other. The top end of the central shaft is fixed with a knob 66 ​​that cooperates with the first clamping block 611 in the axial direction. The knob is detachably connected to the top end of the central shaft through threaded cooperation. A corresponding first arc surface groove is opened on its contact surface to form a first clamping hole 67 for clamping the lateral guide needle, and a corresponding second arc surface groove is opened on the contact surface of the third clamping block 621 and the fourth clamping block 622 to form a second clamping hole 68 for clamping the vertical rod. The first clamping part 61 and the second clamping part 62 can rotate relative to each other around the central axis to facilitate the adjustment of the angle between the first clamping hole 611 and the second clamping hole 612; in this embodiment, the angle between the first clamping hole 611 and the second clamping block 612 is 90°, so that the vertical rod 4 is perpendicular to the lateral guide needle 10.

[0029] like Figure 2 , which is the unlocked state of the rod clamp 6. At this time, the first clamping part 61 and the second clamping part 62 are separated under the action of the spring. The first clamping block 611 and the second clamping block 612 are manually opened, and the first clamping hole expands. After the cross bar is inserted, the cross bar 7 is initially clamped under the action of elastic force. The vertical bar is installed in the second clamping hole in the same way, and then the knob 66 ​​is turned to make the first clamping part and the second clamping part approach each other, and the spring is compressed; the angle between the clamping holes is adjusted to make the cross bar 7 and the vertical bar 4 perpendicular in space. After adjusting the position, the knob 66 ​​is continued to be turned to make the anti-slip teeth 65 on the opposite end faces of the first and second clamping parts close together, and the teeth on the anti-slip teeth bite each other, so as to further clamp and position the vertical bar 4 and the cross bar 7, and keep the angle between the clamping holes constant.

[0030] The first and second needle bar clamps have the same structure and working principle as the bar clamp 6, which will not be described in detail. However, when the diameters of the horizontal bar / vertical bar and the lateral / anteroposterior guide needle are different, the inner diameter of the clamp hole can be adaptively changed, for example Figure 4As shown, when the diameter of the lateral guide needle is smaller than the diameter of the vertical rod, the inner diameter of the clamping hole used to clamp the lateral guide needle is smaller than the inner diameter of the clamping hole corresponding to the vertical rod.

[0031] In this embodiment, one end of the regulator is provided with a first blind hole 111 for detachably inserting the lateral guide needle and a first locking hole 112 connected to the first blind hole, and the other end is provided with a second blind hole 113 for detachably inserting the positioning rod and a second locking hole 114 connected to the second blind hole. The middle part of the regulator is provided with a through hole 115 for inserting the transverse guide needle and a third locking hole 116 connected to the through hole. The first and second blind holes and the axis of the through hole are located on the same horizontal plane, so that the lateral guide needle 10, the transverse guide needle 12, and the hollow positioning guide 14 are located on the same horizontal plane. Each locking screw is screwed into the corresponding locking hole to lock and fix the lateral guide needle 10, the transverse guide needle 12, and the hollow positioning guide 14 respectively.

[0032] Preferably, the front end of the hollow positioning guide 14 is in the shape of a quadrangular pyramid, which can reduce blunt injuries to soft tissues and facilitate positioning.

[0033] Preferably, the tail end of the hollow positioning guide 14 is a stepped shaft structure, and the sliding portion 142 with a smaller stepped shaft diameter slides in the sliding hole 1301 to facilitate adjustment of the position of the front end of the hollow positioning guide and facilitate the abutment of the front end of the hollow positioning guide with the transverse guide needle. The sliding portion is cylindrical or rectangular in shape with the same height as the sliding hole, and the upper and lower end faces of the rectangular sliding portion are in surface contact with the wall of the sliding hole, so that the hollow positioning guide as a whole and the transverse guide needle are kept at the same level during the operation.

[0034] The working process of the present invention is as follows:

[0035] The present invention is clamped to the side bed frame of the thigh side of the operating bed where the patient lies by the buckle 3. Before the operation, the angle between the first clamping part and the second clamping part on the rod clamp 6 is adjusted to make the vertical rod 4 perpendicular to the horizontal rod 7. Similarly, the first and second needle rod clamps are adjusted to make the lateral guide needle perpendicular to the vertical rod and the anteroposterior guide needle perpendicular to the horizontal rod. The intersection of the anteroposterior midline section of the femur and the lateral midline section of the femur is the femoral midline. During the operation, the patient lies on the operating table, and the upper and lower positions of the first needle rod clamp 5 on the vertical rod 4 are adjusted so that the lateral guide needle 10 is perpendicular to the vertical rod 4 and attached to the side of the patient's thigh. Then, the lateral position of the femur is projected using a fluoroscopic machine. If there is a deviation, the lateral guide needle is adjusted to align with the lateral midline of the femur; then the height of the rod clamp and the position of the second needle rod clamp on the cross bar are adjusted so that the anteroposterior guide needle is attached to the middle part above the patient's thigh, that is, the anteroposterior midline of the thigh. The anteroposterior position of the femur is projected using a fluoroscopic machine. If there is a deviation, the anteroposterior guide needle is adjusted to align with the anteroposterior midline of the femur. At this time, the present invention marks the anteroposterior and lateral midlines of the femur through the lateral guide needle 10 and the anteroposterior guide needle 9. Then adjust the fastening position of the transverse guide pin 12 in the regulator so that the tip of the transverse guide pin 12 is located on the vertical plane where the anteroposition guide pin 9 is located and the tip of the transverse guide pin is against the greater trochanter of the femur. At this time, the point pointed by the tip of the transverse guide pin is on the femoral midline, so as to determine the best intramedullary nail guide pin insertion point and the intramedullary nail insertion point. Then, the four-sided platform end of the head of the hollow positioning guide 14 is pressed against the tip of the transverse guide pin, and then the intramedullary nail guide pin 15 is inserted into the guide pin channel and passed out from the outlet of the four-sided platform end to press against the insertion point, and finally the intramedullary nail guide pin is inserted into the femur, and the intramedullary nail guide pin is finally drilled into the desired position along the femoral midline, so as to facilitate the subsequent accurate implantation of the intramedullary nail.

[0036] The above is only a preferred embodiment of the present invention. Any technician familiar with the profession, without departing from the scope of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention, still falls within the scope of the technical solution of the present invention.

Claims

1. A femoral intramedullary nail proximal insertion point positioning and navigation device, characterized in that The invention comprises a buckle fixed on the operating table and a vertical rod installed on the buckle and slidably arranged in the vertical direction, the vertical rod is slidably arranged with a first needle bar clamp and a rod bar clamp from bottom to top in sequence, a cross bar perpendicular to the vertical rod is slidably arranged on the rod bar clamp, the cross bar is also slidably connected with the second needle bar clamp, an anteroposterior guide needle perpendicular to the cross bar is slidably arranged on the second needle bar clamp, the first needle bar clamp is also slidably connected with one end of the lateral guide needle, and the lateral guide needle and the anteroposterior guide needle are arranged parallel to each other, the other end of the lateral guide needle is connected to one end of the regulator, and the regulator slides A transverse guide needle is provided which is in the same horizontal plane as the lateral guide needle and is perpendicular to each other. The other end of the adjuster is connected to the positioning rod. A hollow positioning guide which is in the same horizontal plane as the transverse guide needle is installed in a sliding hole opened at the proximal end of the positioning rod. The front end of the hollow positioning guide is bent and extended toward the tip of the transverse guide needle. A guide needle channel is provided in the hollow positioning guide. The entrance of the guide needle channel is opened on a side of the hollow positioning guide which is away from the transverse guide needle. The exit is arranged at the front end of the hollow positioning guide and the direction of the exit is perpendicular to the length direction of the transverse guide needle.

2. A femoral intramedullary nail proximal insertion point positioning and navigation device according to claim 1, characterized in that: The buckle includes an integrally formed C-shaped clamp and a vertical rod clamp block. The bottom of the C-shaped clamp is threadedly connected to a locking screw for fixing the C-shaped clamp to the side of the operating bed. The vertical rod clamp block is provided with a mounting hole for the vertical rod to pass through and a threaded hole connected to the mounting hole. A locking bolt for pressing the vertical rod into position is provided in the threaded hole.

3. A femoral intramedullary nail proximal insertion point positioning and navigation device according to claim 1, characterized in that: The rod clamp comprises a first clamping part, a second clamping part and a central axis installed in the first clamping part and the second clamping part, the first clamping part comprises a first clamping block and a second clamping block that are interlocked with each other, the second clamping part comprises a third clamping block and a fourth clamping block that are interlocked with each other, the bottom end of the central axis is provided with a limiting boss that cooperates with the fourth clamping block and an external thread that cooperates with the internal thread of the fourth clamping block, a spring is provided between the second clamping block and the third clamping block, and the contact surfaces of the second clamping block and the third clamping block are provided with anti-slip teeth that cooperate with each other. The top end of the central axis is fixedly provided with a knob that cooperates with the first clamping block in the axial direction. The first clamping block and the second clamping block are provided with a corresponding first arc surface groove at their intersection to form a first clamping hole for clamping the cross bar, and the third clamping block and the fourth clamping block are provided with a corresponding second arc surface groove at their intersection to form a second clamping hole for clamping the vertical bar. The first clamping part and the second clamping part can rotate relative to each other around the central axis to facilitate adjusting the angle of the first clamping hole and the second clamping hole. The structures of the first needle bar clamp and the second needle bar clamp are the same as the bar clamp structure.

4. A femoral intramedullary nail proximal insertion point positioning and navigation device according to claim 3, characterized in that: The knob is detachably connected to the top end of the central shaft.

5. A femoral intramedullary nail proximal insertion point positioning and navigation device according to claim 1, characterized in that: One end of the regulator is provided with a first blind hole for inserting a lateral guide needle and a first locking hole connected to the first blind hole, the other end is provided with a second blind hole for inserting a positioning rod and a second locking hole connected to the second blind hole, and the middle part of the regulator is provided with a through hole for inserting a transverse guide needle and a third locking hole connected to the through hole.

6. A femoral intramedullary nail proximal insertion point positioning and navigation device according to claim 1, characterized in that: The front end of the hollow positioning guide is in the shape of a quadrangular cone.

7. A femoral intramedullary nail proximal insertion point positioning and navigation device according to claim 1, characterized in that: The sliding part of the hollow positioning guide in the sliding hole and the front end body form a stepped shaft.

8. A femoral intramedullary nail proximal insertion point positioning and navigation device according to claim 7, characterized in that: The sliding part is cylindrical or rectangular.

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