Proximal femoral intramedullary nail

Abstract

The invention provides a proximal femur intramedullary nail, which comprises a fixing part, a fixing part, a locking part, a locking part and a locking part, the fixing part comprises a fixing cylinder, and the fixing cylinder is configured to be obliquely arranged in a femur main body in a penetrating manner; the fixing assembly comprises a fastening piece and a locking piece, the fastening piece and the locking piece are both arranged in the fixing cylinder in a penetrating mode, an included angle exists between the fastening piece and the locking piece, the fastening piece comprises a first rod section and a second rod section, the axis of the first rod section coincides with the axis of the second rod section, the first rod section and the second rod section are detachably arranged, and the first rod section and the second rod section are detachably connected. The first rod section is configured to penetrate through the proximal femur and be connected with the femoral head, the second rod section is arranged in the proximal femur in a penetrating mode, the first end of the locking piece is configured to penetrate through the proximal femur and be connected with the femoral head, and the second end of the locking piece is arranged in the second rod section in a penetrating mode. According to the technical scheme, the problem that in the related technology, when the intramedullary nail is arranged, bone cement needs to be added for filling and fixing, and then the intramedullary nail cannot be taken out of the femur can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a proximal femoral intramedullary nail. Background Art

[0002] As humans gradually enter an aging society, most elderly people are weak and sickly and suffer from osteoporosis. Intertrochanteric fractures caused by osteoporosis have become the fracture that poses the greatest threat to the elderly. The incidence of proximal femoral fractures is gradually increasing. Therefore, more and more elderly people are forced to undergo joint replacement due to osteoporotic intertrochanteric fractures.

[0003] Among the relevant technologies, combined with the fracture type and the patient's own characteristics, extramedullary nail plate system (DHS, DCS, etc.), intramedullary nail system (PFNA, InterTAN, etc.) or artificial joint replacement can be used for surgical treatment, which is the surgical option chosen by most orthopedic surgeons.

[0004] However, in the related art, when setting the intramedullary nail, bone cement needs to be added for filling and fixation, which makes it impossible to remove the intramedullary nail from the femur. Summary of the invention

[0005] The present invention provides a proximal femoral intramedullary nail to solve the problem in the related art that when setting the intramedullary nail, bone cement needs to be added for filling and fixation, which results in the intramedullary nail being unable to be removed from the femur.

[0006] The present invention provides a proximal femoral intramedullary nail, which comprises: a fixing portion, comprising a fixing tube, which is configured to be obliquely penetrated into a femoral body; a fixing assembly, comprising a fastener and a locking piece, which are both penetrated into the fixing tube, and there is an angle between the fastener and the locking piece, the fastener comprises a first rod segment and a second rod segment, the axis of the first rod segment coincides with the axis of the second rod segment, the first rod segment and the second rod segment are detachably arranged, the first rod segment is configured to be penetrated into a proximal femur and connected to a femoral head, the second rod segment is penetrated into the proximal femur, the first end of the locking piece is configured to be penetrated into the proximal femur and connected to a femoral head, and the second end of the locking piece is penetrated into the second rod segment.

[0007] Furthermore, the first end of the first rod segment is inserted into the femoral head, a first connecting hole is provided on the first rod segment, and the first end of the second rod segment extends into the first connecting hole and is connected to the first rod segment.

[0008] Furthermore, the first connecting hole includes a first hole segment and a second hole segment that are connected, the axis of the first hole segment coincides with the axis of the second hole segment, the second hole segment is a tapered hole, the diameter cross-sectional size of the second hole segment gradually decreases in the direction from the second end of the first rod segment toward the first end, and the first end of the second rod segment is provided with a tapered mounting column that matches the second hole segment, the tapered mounting column extends into the second hole segment and abuts against the second hole segment to connect the first rod segment with the second rod segment.

[0009] Furthermore, an anti-rotation structure is provided on the second end of the first rod segment and the first end of the second rod segment to prevent the first rod segment and the second rod segment from rotating relative to each other.

[0010] Furthermore, the anti-rotation structure includes a snap-in groove and a snap-in boss. The snap-in groove is arranged on the first end of the second rod segment, the snap-in boss is arranged on the second end of the first rod segment, the snap-in boss extends toward the second rod segment, and the snap-in boss is snap-fitted with the snap-in groove.

[0011] Furthermore, a drug loading chamber is provided on the outer wall of the conical mounting column, and a drug releasing hole is provided on the drug loading chamber. When the inner wall of the second hole segment abuts against the outer wall of the conical mounting column, the inner wall of the second hole segment cooperates with the drug loading chamber to release the drug in the drug loading chamber through the drug releasing hole.

[0012] Furthermore, the first rod segment is a porous grid structure.

[0013] Furthermore, a second connecting hole is provided on the second rod segment, the axis of the second connecting hole coincides with the axis of the first connecting hole, an inclined and penetrating mounting hole is provided on the second rod segment, a locking piece is passed through the mounting hole, the locking piece includes a locking head, the locking head is provided with an external thread, an internal thread is provided on the inner side wall of the mounting hole, the internal thread cooperates with the external thread to fix the locking piece on the second rod segment.

[0014] Furthermore, the locking piece is provided with a bone thread for penetrating the femoral head.

[0015] Furthermore, the fixing part also includes a fixing plate, which is arranged vertically, one end of which is connected to the fixing tube, the fixing plate is arranged on the proximal end of the femur, a third connecting hole is arranged on the fixing tube, the fastener is passed through the third connecting hole and is limitedly matched with the hole wall of the third connecting hole.

[0016] Furthermore, a relief notch for evading the locking member is provided on the side wall of the fixing tube.

[0017] Furthermore, the fixing plate is provided with an avoidance hole, and the proximal femoral intramedullary nail also includes a transverse locking screw, which is passed through the avoidance hole and extends into the proximal femur.

[0018] According to the technical solution of the present invention, the proximal femoral intramedullary nail includes a fixing part and a fixing assembly, wherein the fixing tube of the fixing part can be inserted into the main body of the femur, and the fixing tube is obliquely inserted into the main body of the femur, so that it is convenient for the fastener to be inserted into the fixing tube and connected to the femoral head. Wherein, the fastener and the locking member are both inserted into the fixing tube, and there is an angle between the fastener and the locking member, so that when the fastener is inserted into the fixing tube and the fastener is connected to the femoral head, and the first end of the locking member is used to pass through the proximal femur and connected to the femoral head, in this way, when there is an angle between the locking member and the fastener, the locking member and the fastener can achieve a cross-locking effect, and then when the fastener is inserted into the fixing tube and connected to the femoral head, the angle between the locking member and the fastener can enhance the fixing effect on the femoral head. Specifically, the fastener includes a first rod segment and a second rod segment, the first rod segment and the second rod segment are detachably arranged, and the first rod segment can pass through the proximal femur and can extend into the femoral head to connect with the femoral head, the second rod segment is penetrated into the proximal femur, the first end of the locking piece is penetrated through the proximal femur and connected with the femoral head, the second end of the locking piece is penetrated into the second rod segment, and then when the proximal femur fracture is needed, the first rod segment is connected to the second rod segment, so that the first rod segment is penetrated into the femoral head and the second rod segment is penetrated into the proximal femur, so that the medical staff can drive the first rod segment and the second rod segment to move by operating the tool, thereby facilitating the femoral head to move and fit with the proximal femur, which is convenient for bone ingrowth at the proximal femoral fracture site in the later stage, and the first end of the locking piece is used The second rod segment is connected to the femoral head by passing through the proximal femur and connecting with the femoral head. The cross-locking effect can be achieved under the action of the locking piece and the fastener, thereby improving the fixation effect on the femoral head and facilitating the installation of the locking piece on the second rod segment. When the fastener needs to be disassembled, it is only necessary to disassemble the second rod segment from the locking piece, and then disassemble and separate the second rod segment from the first rod segment. This can not only achieve the recovery of the proximal femoral fracture site and achieve bone ingrowth at the connection between the femoral head and the proximal femur, but also facilitate the fixation of the proximal femoral intramedullary nail, and facilitate the removal of the second rod segment, the locking piece and the fixing tube from the proximal femur, thereby ensuring that the proximal femoral fracture site can achieve bone ingrowth under the action of the proximal femoral intramedullary nail, thereby improving the practicability of the proximal femoral intramedullary nail. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 A schematic diagram of the structure of a proximal femoral intramedullary nail according to an embodiment of the present invention is shown;

[0021] Figure 2A schematic diagram showing the installation of a proximal femoral intramedullary nail provided in an embodiment of the present invention in the proximal femur;

[0022] Figure 3 It shows a schematic structural diagram of a locking member provided in an embodiment of the present invention being installed on a fastener;

[0023] Figure 4 A schematic structural diagram of a fastener provided in an embodiment of the present invention is shown;

[0024] Figure 5 A schematic structural diagram of a first rod section of a fastener provided according to an embodiment of the present invention is shown;

[0025] Figure 6 A schematic structural diagram of a locking member provided according to an embodiment of the present invention is shown;

[0026] Figure 7 A schematic structural diagram of a proximal femoral intramedullary nail according to another perspective is shown;

[0027] Figure 8 Shows Figure 7 Cross-sectional view at AA in the middle.

[0028] The above drawings include the following reference numerals:

[0029] 10. fixing part; 11. fixing cylinder; 111. third communication hole; 112. avoidance notch; 12. fixing plate; 121. avoidance hole;

[0030] 20. Fixing assembly; 21. Fastener; 211. First rod segment; 2111. First communicating hole; 2112. First hole segment; 2113. Second hole segment; 212. Second rod segment; 2121. Conical mounting column; 2122. Second communicating hole; 2123. Mounting hole; 22. Locking member; 221. Locking head;

[0031] 30. Anti-rotation structure; 31. Snap-fit ​​groove; 32. Snap-fit ​​boss;

[0032] 40. Horizontal locking screw. DETAILED DESCRIPTION

[0033] 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, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. 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.

[0034] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a proximal femoral intramedullary nail, which includes a fixing portion 10 and a fixing assembly 20. The fixing portion 10 includes a fixing tube 11, which is configured to be obliquely penetrated into the femoral body. The fixing assembly 20 includes a fastener 21 and a locking member 22. The fastener 21 and the locking member 22 are both penetrated into the fixing tube 11. There is an angle between the fastener 21 and the locking member 22. The fastener 21 includes a first rod segment 211 and a second rod segment 212. The axis of the first rod segment 211 coincides with the axis of the second rod segment 212. The first rod segment 211 and the second rod segment 212 are detachably arranged. The first rod segment 211 is configured to penetrate into the proximal femur and connect to the femoral head. The second rod segment 212 is penetrated into the proximal femur. The first end of the locking member 22 is configured to penetrate into the proximal femur and connect to the femoral head. The second end of the locking member 22 is penetrated into the second rod segment 212.

[0035] The proximal femoral intramedullary nail provided in this embodiment is applied, and the proximal femoral intramedullary nail includes a fixing part 10 and a fixing assembly 20, wherein the fixing tube 11 of the fixing part 10 can be inserted into the main body of the femur, and the fixing tube 11 is obliquely inserted into the main body of the femur, so that it is convenient for the fastener 21 to be inserted into the fixing tube 11 and to be connected to the femoral head. Wherein, the fastener 21 and the locking member 22 are both inserted into the fixing tube 11, and there is an angle between the fastener 21 and the locking member 22, so that when the fastener 21 is inserted into the fixing tube 11 and the fastener 21 is connected to the femoral head, and the first end of the locking member 22 is used to pass through the proximal femur and connect to the femoral head, so that when there is an angle between the locking member 22 and the fastener 21, the locking member 22 and the fastener 21 can achieve a cross-locking effect, and then when the fastener 21 is inserted into the fixing tube 11 and connected to the femoral head, the angle between the locking member 22 and the fastener 21 can enhance the fixing effect on the femoral head. Specifically, the fastener 21 includes a first rod segment 211 and a second rod segment 212, and the first rod segment 211 and the second rod segment 212 are detachably arranged, and the first rod segment 211 can pass through the proximal end of the femur and can extend into the femoral head to connect with the femoral head, and the second rod segment 212 is penetrated into the proximal end of the femur, and the first end of the locking member 22 is penetrated into the second rod segment 212, and then when the proximal femur fracture is required, the first rod segment 211 and the second rod segment 212 are connected, so that the first rod segment 211 is penetrated into the femoral head, and the second rod segment 212 is penetrated into the proximal end of the femur, so that the medical staff can drive the first rod segment 211 and the second rod segment 212 to move by operating the tool, thereby facilitating the femoral head to move and fit with the proximal femur, facilitating bone ingrowth at the proximal femoral fracture site in the later stage, and the locking member 22 can be locked. The first end of the fixing member 22 is used to pass through the proximal femur and connect with the femoral head, and can achieve a cross-locking effect under the action of the locking member 22 and the fastener 21, thereby improving the fixation effect on the femoral head and facilitating the installation of the locking member 22 on the second rod segment 212. When the fastener 21 needs to be disassembled, it is only necessary to disassemble the second rod segment 212 from the locking member 22, and then disassemble and separate the second rod segment 212 from the first rod segment 211. This can not only achieve the recovery of the proximal femoral fracture site, achieve bone ingrowth at the connection between the femoral head and the proximal femur, and facilitate the fixation of the proximal femoral intramedullary nail, but also facilitate the removal of the second rod segment 212, the locking member 22 and the fixing tube 11 from the proximal femur, thereby ensuring that the proximal femoral fracture site can achieve bone ingrowth under the action of the proximal femoral intramedullary nail, thereby improving the practicality of the proximal femoral intramedullary nail.

[0036] It should be noted that the fixing tube 11 is obliquely inserted into the main body of the femur, so that the fastener 21 can be inserted into the fixing tube 11, and then the fastener 21 can be connected to the femoral head, and the locking piece 22 is connected to the second rod segment 212 of the fastener 21, so that the locking piece 22 can be inserted into the proximal end of the femur and connected to the femoral head. There is an angle between the locking piece 22 and the fastener 21, so that when the fastener 21 is inserted into the femoral head, the locking piece 22 and the fastener 21 can play a cross-locking role, thereby improving the fixation effect on the femoral head.

[0037] The first rod segment 211 is inserted into the femoral head and connected to the femoral head. By disassembling the second rod segment 212, the first rod segment 211 and the second rod segment 212 are disassembled to avoid damage to the femoral head.

[0038] like Figures 1 to 5 As shown, the first end of the first rod segment 211 is inserted into the femoral head, and the first rod segment 211 is provided with a first connecting hole 2111, and the first end of the second rod segment 212 extends into the first connecting hole 2111 and is connected to the first rod segment 211. With the above structure, by inserting the first end of the first rod segment 211 into the femoral head and the first end of the second rod segment 212 extending into the first connecting hole 2111 of the first rod segment 211, it is convenient to realize detachable connection between the first rod segment 211 and the second rod segment 212, which is convenient for connecting the first rod segment 211 and the second rod segment 212 through the first connecting hole 2111, and also convenient for detaching the second rod segment 212 from the first rod segment 211.

[0039] like Figure 7 and Figure 8As shown, the first connecting hole 2111 includes a first hole segment 2112 and a second hole segment 2113 that are connected to each other. The axis of the first hole segment 2112 coincides with the axis of the second hole segment 2113. The second hole segment 2113 is a tapered hole. The diameter cross-sectional size of the second hole segment 2113 gradually decreases in the direction from the second end of the first rod segment 211 toward the first end. The first end of the second rod segment 212 is provided with a tapered mounting column 2121 that matches the second hole segment 2113. The tapered mounting column 2121 extends into the second hole segment 2113 and abuts against the second hole segment 2113 to connect the first rod segment 211 with the second rod segment 212. With the above structure, the first hole section 2112 and the second hole section 2113 are arranged, and the axis of the first hole section 2112 coincides with the axis of the second hole section 2113, so that the first hole section 2112 is connected with the second hole section 2113, and the second hole section 2113 is a tapered hole, and the diameter cross-sectional dimension of the second hole section 2113 gradually decreases in the direction from the second end of the first rod section 211 toward the first end, so that the tapered mounting post 2121 on the second rod section 212 can be connected with the second hole section 2113. 2113 cooperates so that the conical mounting column 2121 abuts against the second hole section 2113, thereby making the conical mounting column 2121 of the first rod segment 211 and the second hole section 2113 of the second rod segment 212 realize conical cooperation, ensuring that the conical mounting column 2121 abuts against the conical hole, ensuring that the first rod segment 211 and the second rod segment 212 are fixedly connected, and when disassembling, it is also convenient to disassemble and separate the second rod segment 212 from the first rod segment 211.

[0040] It should be noted that the conical matching structure can provide a more stable connection method. Through the conical design between the second hole section 2113 and the conical mounting column 2121, the contact area of ​​the connection can be increased, thereby improving the stability and firmness of the connection and reducing the risk of loosening or falling off. The conical matching structure has the characteristic of self-centering, that is, the second hole section 2113 and the conical mounting column 2121 will automatically adjust their positions during the connection process so that their axes remain centered, which helps to ensure the accuracy and stability of the connection. Compared with other connection methods, the conical matching structure is easier to manufacture and install. The connection can be completed by simply inserting the conical component into the corresponding hole without additional tools or complicated operations. Due to the design of the conical matching structure, the stress generated during the connection can be more evenly distributed on the connection surface, thereby effectively transferring the load, reducing the problem of local stress concentration, and helping to improve the durability and reliability of the system. The design of the conical matching structure is relatively simple, without too many parts or complex connection methods, so it has high reliability. This means that in actual use, the conical matching structure is less prone to failure or damage and can maintain long-term stability and performance.

[0041] like Figures 3 to 5As shown, an anti-rotation structure 30 is provided on the second end of the first rod segment 211 and the first end of the second rod segment 212 to prevent the first rod segment 211 and the second rod segment 212 from rotating relative to each other. With the above structure, by providing the anti-rotation structure 30 on the second end of the first rod segment 211 and the first end of the second rod segment 212, the anti-rotation structure 30 can prevent the first rod segment 211 and the second rod segment 212 from rotating relative to each other, thereby improving the reliability of the connection between the proximal femur and the femoral head, and preventing the rotation between the first rod segment 211 and the second rod segment 212 from causing further damage to the proximal femoral fracture site.

[0042] like Figures 3 to 5 As shown, the anti-rotation structure 30 includes a clamping groove 31 and a clamping boss 32. The clamping groove 31 is arranged on the first end of the second rod segment 212, and the clamping boss 32 is arranged on the second end of the first rod segment 211. The clamping boss 32 extends toward the direction of the second rod segment 212, and the clamping boss 32 is clamped and matched with the clamping groove 31. With the above structure, the clamping groove 31 is arranged on the first end of the second rod segment 212, and the clamping boss 32 is arranged on the second end of the first rod segment 211. The first rod segment 211 and the second rod segment 212 are clamped and matched by the clamping boss 32 and the clamping groove 31, so as to avoid relative rotation between the first rod segment 211 and the second rod segment 212, thereby preventing relative rotation between the first rod segment 211 and the second rod segment 212, and preventing the rotation between the first rod segment 211 and the second rod segment 212 from causing further damage to the proximal femoral fracture site.

[0043] In this embodiment, a drug loading chamber is provided on the outer wall of the conical mounting column 2121, and a drug releasing hole is provided on the drug loading chamber. When the inner wall of the second hole section 2113 abuts against the outer wall of the conical mounting column 2121, the inner wall of the second hole section 2113 cooperates with the drug loading chamber to release the drug in the drug loading chamber through the drug releasing hole. With the above structure, when the conical mounting column 2121 abuts against the second hole section 2113, the second hole section 2113 can squeeze the drug loading chamber, so that the drug loading chamber discharges the drug in the drug loading chamber through the drug releasing hole, so that the growth factor in the drug loading chamber can be released, and then the proximal femoral fracture site can be recovered, and the femoral head and the proximal femur are prevented from being tightly connected.

[0044] It should be noted that the material of the drug-loading chamber can be one of polyethylene, polypropylene, etc. These polymers have good mechanical properties and biocompatibility, can be used as the storage structure of the drug-loading chamber, and have a certain elasticity, and can extrude the growth factor after bearing a certain pressure. Moreover, when the drug-loading chamber is not squeezed, it will also flow to the outside of the implant with the flow of body fluids, and the continuous force squeezing through the cone can better promote the outflow of growth factors. The greater the squeezing force, the more unstable the fracture site is, and the faster the growth factor is released. When the entire area tends to be stable, the squeezing force becomes smaller, and the growth factor outflow is smaller, thereby achieving a growth factor outflow rate that matches the healing speed of the fracture area.

[0045] In this embodiment, the first rod segment 211 is a porous grid structure. With the above structure, a porous grid structure is provided on the first rod segment 211, which facilitates bone ingrowth between the first rod segment 211 and the femoral head, facilitates the connection between the first rod segment 211 and the femoral head, and facilitates the recovery of the proximal femoral fracture site.

[0046] It should be noted that the porous mesh structure can be processed and manufactured by additive manufacturing, and has the following characteristics: The porous mesh structure can provide more surface area, which is conducive to the growth and healing of bone tissue. By increasing the contact area between bone tissue and the internal fixation system, the porous mesh can promote bone healing and accelerate the healing process, which is particularly advantageous for patients with osteoporosis. The porous mesh structure can disperse the pressure on the fracture site. By dispersing the pressure to multiple small holes instead of concentrating it on one point, local pressure can be reduced, pain at the fracture site can be reduced, and the risk of further injury can be reduced. The porous mesh structure can increase the surface roughness of the internal fixation system and the surrounding bone tissue, and improve the friction and stability of the connection. This helps prevent displacement or loosening of the internal fixation system, thereby better supporting and fixing the fracture site.

[0047] Specifically, when the patient needs to remove the internal fixation system due to bone healing or other reasons, the split structure of the first rod segment 211 and the second rod segment 212 can ensure the removal of all parts except the first rod segment 211 of the fixing tube 11. The first rod segment 211 is completely fused with the femoral head due to its porous structure, and its retention in the femoral head does not affect the overall structure of the patient's femur.

[0048] like Figure 4 , Figure 6 , Figure 7 as well as Figure 8As shown, the second rod segment 212 is provided with a second connecting hole 2122, the axis of the second connecting hole 2122 coincides with the axis of the first connecting hole 2111, and the second rod segment 212 is provided with an inclined and penetrating mounting hole 2123, the locking member 22 is passed through the mounting hole 2123, the locking member 22 includes a locking head 221, the locking head 221 is provided with an external thread, and the inner side wall of the mounting hole 2123 is provided with an internal thread, and the internal thread cooperates with the external thread to fix the locking member 22 on the second rod segment 212. By adopting the above structure, a second connecting hole 2122 is provided on the second rod segment 212, and an inclined and penetrating mounting hole 2123 is provided on the second rod segment 212, an external thread is provided on the outer wall of the locking head 221, and an internal thread is provided on the inner wall of the mounting hole 2123, so that the locking head 221 and the mounting hole 2123 are connected and fixed, so that the locking member 22 can be fixed on the second rod segment 212 under the action of threaded cooperation between the internal thread and the external thread, making the installation method convenient.

[0049] It should be noted that the first connecting hole 2111 is connected to the second connecting hole 2122, and then the guide needle is used for directional implantation, so that the angle between the locking member 22 and the fastener 21 is set between 7° and 10°.

[0050] In this embodiment, bone threads for being inserted into the femoral head are provided on the locking member 22. By providing the bone threads on the locking member 22, it is convenient to insert the locking member 22 into the femoral head.

[0051] like Figure 1 and Figure 2 As shown, the fixing part 10 also includes a fixing plate 12, which is arranged vertically, one end of which is connected to the fixing tube 11, and the fixing plate 12 is arranged on the proximal end of the femur. The fixing tube 11 is provided with a third connecting hole 111, and the fastener 21 is passed through the third connecting hole 111 and is limitedly matched with the hole wall of the third connecting hole 111. With the above structure, by vertically arranging the fixing plate 12 on the proximal end of the femur, and one end of the fixing plate 12 is connected to the fixing tube 11, the fastener 21 passes through the third connecting hole on the fixing tube 11 and can be connected to the femoral head, and the fastener 21 is limitedly matched with the hole wall of the third connecting hole 111, so that the fastener 21 can be accurately installed in the fixing tube 11, and the fastener 21 can be prevented from entering the femoral head too deep, causing the fastener 21 to pass through the femoral head, thereby playing a role of moving limit for the fastener 21.

[0052] It should be noted that the included angle between the fixing plate 12 and the fixing tube 11 is set at 125° to 130°, which is similar to the femoral neck shaft angle. The fixing tube 11 provides support for the sliding of the cross structure of the fastener 21 and the locking member 22 .

[0053] like Figure 1 As shown, a clearance notch 112 for evading the locking member 22 is provided on the side wall of the fixing cylinder 11. With the above structure, by providing the clearance notch 112 on the side wall of the fixing cylinder 11, an angle is formed between the locking member 22 and the fastener 21, so that the locking member 22 can pass through the clearance notch 112 and extend into the femoral head, thereby making the clearance notch 112 play a role of evasion.

[0054] like Figure 1 As shown, the fixing plate 12 has an avoidance hole 121, and the proximal femoral intramedullary nail also includes a transverse locking screw 40, which is inserted through the avoidance hole 121 and extends into the proximal femur. With the above structure, the transverse locking screw 40 is inserted through the avoidance hole 121 on the fixing plate 12, thereby connecting the transverse locking screw 40 to the proximal femur.

[0055] It should be noted that the transverse locking screw 40 is a 5.0 mm diameter locking screw, and the tapered thread on its head can be combined with the fixing plate 12 for locking. The function of the locking screw is to provide distal transverse locking for the entire system, which can effectively increase the stability of the entire system.

[0056] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0057] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0058] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0059] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0060] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A proximal femoral intramedullary nail, characterized in that: The proximal femoral intramedullary nail comprises: The fixing portion (10) comprises a fixing tube (11), wherein the fixing tube (11) is configured to be obliquely inserted into a femoral body; A fixing assembly (20) comprises a fastener (21) and a locking member (22), wherein the fastener (21) and the locking member (22) are both inserted into the fixing tube (11), an angle is formed between the fastener (21) and the locking member (22), the fastener (21) comprises a first rod segment (211) and a second rod segment (212), an axis of the first rod segment (211) and an axis of the second rod segment (212) coincide with each other, the first rod segment (211) and the second rod segment (212) are detachably arranged, the first rod segment (211) is configured to pass through the proximal end of the femur and connect to the femoral head, the second rod segment (212) is inserted into the proximal end of the femur, a first end of the locking member (22) is configured to pass through the proximal end of the femur and connect to the femoral head, and a second end of the locking member (22) is inserted into the second rod segment (212).

2. The proximal femoral intramedullary nail according to claim 1, characterized in that: The first end of the first rod segment (211) is inserted into the femoral head, a first connecting hole (2111) is provided on the first rod segment (211), and the first end of the second rod segment (212) extends into the first connecting hole (2111) and is connected to the first rod segment (211).

3. The proximal femoral intramedullary nail according to claim 2, characterized in that: The first connecting hole (2111) comprises a first hole section (2112) and a second hole section (2113) which are connected to each other. The axis of the first hole section (2112) coincides with the axis of the second hole section (2113). The second hole section (2113) is a tapered hole. The diameter cross-sectional size of the second hole section (2113) gradually decreases in the direction from the second end of the first rod section (211) toward the first end. The first end of the second rod section (212) is provided with a tapered mounting column (2121) which matches the second hole section (2113). The tapered mounting column (2121) extends into the second hole section (2113) and abuts against the second hole section (2113) to connect the first rod section (211) with the second rod section (212).

4. The proximal femoral intramedullary nail according to any one of claims 1 to 3, characterized in that: An anti-rotation structure (30) is provided on the second end of the first rod segment (211) and the first end of the second rod segment (212) to prevent the first rod segment (211) and the second rod segment (212) from rotating relative to each other.

5. The proximal femoral intramedullary nail according to claim 4, characterized in that: The anti-rotation structure (30) comprises a clamping groove (31) and a clamping boss (32); the clamping groove (31) is arranged on the first end of the second rod segment (212); the clamping boss (32) is arranged on the second end of the first rod segment (211); the clamping boss (32) extends in the direction of the second rod segment (212); and the clamping boss (32) is clamped and matched with the clamping groove (31).

6. The proximal femoral intramedullary nail according to claim 3, characterized in that: A drug loading chamber is provided on the outer wall of the conical mounting column (2121), and a drug releasing hole is provided on the drug loading chamber. When the inner wall of the second hole section (2113) abuts against the outer wall of the conical mounting column (2121), the inner wall of the second hole section (2113) cooperates with the drug loading chamber to release the drug in the drug loading chamber through the drug releasing hole.

7. The proximal femoral intramedullary nail according to any one of claims 1 to 3, characterized in that: The first rod segment (211) is a porous grid structure.

8. The proximal femoral intramedullary nail according to claim 2, characterized in that: The second rod segment (212) is provided with a second communicating hole (2122), the axis of the second communicating hole (2122) coincides with the axis of the first communicating hole (2111), the second rod segment (212) is provided with an inclined and penetrating mounting hole (2123), the locking member (22) is passed through the mounting hole (2123), the locking member (22) comprises a locking head (221), the locking head (221) is provided with an external thread, an inner side wall of the mounting hole (2123) is provided with an internal thread, the internal thread matches the external thread, so that the locking member (22) is fixed to the second rod segment (212).

9. The proximal femoral intramedullary nail according to any one of claims 1 to 3, characterized in that: The locking piece (22) is provided with a bone thread for penetrating the femoral head.

10. The proximal femoral intramedullary nail according to any one of claims 1 to 3, characterized in that: The fixing portion (10) further comprises a fixing plate (12), the fixing plate (12) being arranged in a vertical direction, one end of the fixing plate (12) being connected to the fixing tube (11), the fixing plate (12) being arranged on the proximal end of the femur, the fixing tube (11) being provided with a third connecting hole (111), the fastener (21) being passed through the third connecting hole (111) and being limitedly matched with the hole wall of the third connecting hole (111).

11. The proximal femoral intramedullary nail according to claim 10, characterized in that: A relief notch (112) for evading the locking member (22) is provided on the side wall of the fixing cylinder (11).

12. The proximal femoral intramedullary nail according to claim 10, characterized in that: The fixing plate (12) is provided with an avoidance hole (121), and the proximal femoral intramedullary nail further comprises a transverse locking screw (40), wherein the transverse locking screw (40) is passed through the avoidance hole (121) and extends into the proximal femur.

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