Proximal femoral intramedullary nail

Abstract

The present invention provides a proximal femoral intramedullary nail, which comprises: an intramedullary nail body, configured to be vertically penetrated in the femoral body; a fixing assembly, comprising a fastener and a rotating member, both of which are obliquely penetrated in the intramedullary nail body, the first end of the fastener is configured to be penetrated in the proximal femur and connected to the proximal femur, the rotating member is rotatably arranged on the intramedullary nail body and driven to cooperate with the second end of the fastener, so as to drive the fastener to drive the proximal femur to move toward the femoral body to a position that fits the femoral body. The technical solution provided by the present application can solve the problem in the related art that the fracture site of the proximal femur may be further damaged or displaced during the fixation process using the intramedullary nail system for patients with poor bone quality, so that the fracture site is not well combined with the bone quality, thereby damaging the bone quality.

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 process of fixation using the intramedullary nail system, patients with poor bone quality in the related art may suffer further damage or displacement of the fracture site at the proximal femur, resulting in poor integration of the fracture site with the bone, thereby damaging the bone. Summary of the invention

[0005] The present invention provides a proximal femoral intramedullary nail to solve the problem in the related art that, during fixation using an intramedullary nail system for patients with poor bone quality, the fracture site of the proximal femur may be further damaged or displaced, resulting in poor integration of the fracture site with the bone quality, thereby damaging the bone quality.

[0006] The present invention provides a proximal femoral intramedullary nail, which comprises: an intramedullary nail body, which is configured to be vertically penetrated into the femoral body; a fixing assembly, which comprises a fastener and a rotating member, which are both obliquely penetrated into the intramedullary nail body, wherein the first end of the fastener is configured to be penetrated into the proximal femur and connected to the proximal femur, and the rotating member is rotatably arranged on the intramedullary nail body and drivingly cooperates with the second end of the fastener, so as to drive the fastener to drive the proximal femur to move toward the femoral body to a position in contact with the femoral body.

[0007] Furthermore, the axis of the fastener is parallel to the axis of the rotating member, a first thread segment is provided on the second end of the fastener, a second thread segment is provided on the rotating member, and the second thread segment is drivingly matched with the first thread segment to drive the fastener to move.

[0008] Further, a stop head is provided at one end of the rotating member corresponding to the second end of the fastener, and the stop head can cooperate with the intramedullary nail body to limit the axial position of the rotating member.

[0009] Furthermore, the first end of the fastener is provided with a third threaded segment, and the third threaded segment is configured to be connected to the proximal end of the femur; the third threaded segment is a porous grid structure.

[0010] Furthermore, an arc-shaped groove is arranged on the fastener, the outer side wall of the rotating member is fitted with the arc-shaped groove, and the first thread segment is arranged in the arc-shaped groove.

[0011] Furthermore, the fastener includes a first connecting rod and a second connecting rod that are coaxially and detachably arranged, and a pull rod for connecting the first connecting rod and the second connecting rod, the third threaded segment is arranged on the first connecting rod, the first threaded segment is arranged on the second connecting rod, a first connecting hole is arranged on the first connecting rod, a second connecting hole is arranged through the second connecting rod, the axis of the first connecting hole coincides with the axis of the second connecting hole, and the pull rod is connected to the second connecting hole and the first connecting hole in sequence.

[0012] Furthermore, a buckle structure is provided between the end of the first connecting rod and the end of the second connecting rod, so that the first connecting rod and the second connecting rod are snap-connected.

[0013] Furthermore, the snap-fit ​​structure includes a snap-fit ​​groove and a snap-fit ​​buckle. A first mounting hole is provided at the end of the first connecting rod. The first mounting hole is connected to the first connecting hole. The aperture of the first mounting hole is larger than the aperture of the first connecting hole. The snap-fit ​​groove is provided on the inner side wall of the first mounting hole. The snap-fit ​​buckle is provided on the end of the second connecting rod. The snap-fit ​​buckle extends into the first mounting hole and is snap-connected with the snap-fit ​​groove.

[0014] Furthermore, the first mounting hole is a waist-shaped hole, and the second connecting rod is provided with a waist-shaped sleeve matching the waist-shaped hole, and the waist-shaped sleeve is provided with a mounting notch, and the snap-fit ​​buckle includes a connecting plate and a snap-fit ​​block, the connecting plate is arranged at the mounting notch, and the snap-fit ​​block is arranged on the end of the connecting plate facing the first connecting rod.

[0015] Furthermore, a drug loading chamber is arranged on the end face of the second connecting rod facing the first connecting rod, and a drug releasing hole is arranged on the drug loading chamber. When the first connecting rod and the second connecting rod are connected by a snap-fit ​​structure, the end face of the first connecting rod facing the second connecting rod cooperates with the drug loading chamber to release the drug in the drug loading chamber through the drug releasing hole.

[0016] Furthermore, one end of the pull rod extending into the first connecting hole is provided with an external thread, and the first connecting hole is provided with an internal thread, and the external thread matches the internal thread to connect the first connecting rod with the second connecting rod.

[0017] Furthermore, the proximal femoral intramedullary nail also includes a transverse locking screw. A fixing hole is provided on the intramedullary nail body, and the transverse locking screw is transversely inserted into the fixing hole.

[0018] By applying the technical solution of the present invention, the proximal femoral intramedullary nail includes an intramedullary nail body and a fixing assembly, the intramedullary nail body can be vertically penetrated into the femoral body, the first end of the fastener of the fixing assembly can be penetrated into the proximal femur, and the first end of the fastener can be connected to the proximal femur, the rotating member can be rotatably penetrated on the intramedullary nail body, the rotating member and the fastener are both obliquely penetrated on the intramedullary nail body, so that the rotating member and the fastener can both be penetrated in the proximal femur, because the first end of the fastener is connected to the proximal femur, the rotating member can be rotatably set in the proximal femur, but does not cooperate with the proximal femur, the rotating member can be drivingly connected to the second end of the fastener, so that during the rotation of the rotating member, the proximal femur can be driven to move toward the direction of the femoral body, thereby ensuring that the fracture site of the proximal femur is reset, so that the femoral body and the proximal femur are fitted. Specifically, when a fracture occurs between the proximal femur and the main body of the femur, it is necessary to first implant an intramedullary nail main body so that the intramedullary nail main body is installed in the main body of the femur, and then the fastener is obliquely inserted into the intramedullary nail main body so that the first end of the fastener is inserted into the proximal femur and connected to the proximal femur, and then the rotating part is obliquely inserted into the intramedullary nail main body so that the rotating part can be rotatably set on the intramedullary nail main body, and the rotating part can be driven and cooperated with the second end of the fastener, so that when the rotating part rotates, the fastener can be driven to move, and then the proximal femur can be reset, so that the proximal femur is fitted with the main body of the femur, ensuring that the intramedullary nail of the proximal femur can fix and reset the fracture site. 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 2 A schematic diagram showing the installation of a proximal femoral intramedullary nail in a tibia according to an embodiment of the present invention is shown;

[0022] Figure 3 A schematic diagram of the structure of a fixing assembly provided in an embodiment of the present invention is shown;

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

[0024] Figure 5 A schematic structural diagram showing another perspective of a fastener of a fixing assembly provided in an embodiment of the present invention;

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

[0026] Figure 7 A schematic structural diagram of a first connecting rod according to another perspective provided by an embodiment of the present invention is shown;

[0027] Figure 8 A schematic structural diagram of a second connecting rod provided according to an embodiment of the present invention is shown.

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

[0029] 10. Intramedullary nail body;

[0030] 20. Fixing assembly; 21. Fastener; 211. First thread segment; 212. Third thread segment; 213. Arc groove; 214. First connecting rod; 2141. First connecting hole; 2142. Mounting hole; 215. Second connecting rod; 2151. Second connecting hole; 2152. Waist sleeve; 216. Pull rod; 22. Rotating member; 221. Second thread segment; 222. Stopper;

[0031] 30. snap-fit ​​structure; 31. snap-fit ​​groove; 32. snap-fit ​​buckle; 321. connecting plate; 322. snap-fit ​​block;

[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 Figures 1 to 3As shown, an embodiment of the present invention provides a proximal femoral intramedullary nail, which includes an intramedullary nail body 10 and a fixing assembly 20. The intramedullary nail body 10 is configured to be vertically penetrated into the femoral body. The fixing assembly 20 includes a fastener 21 and a rotating member 22. The fastener 21 and the rotating member 22 are both obliquely penetrated on the intramedullary nail body 10. The first end of the fastener 21 is configured to be penetrated into the proximal end of the femur and connected to the proximal end of the femur. The rotating member 22 is rotatably arranged on the intramedullary nail body 10 and drivingly cooperates with the second end of the fastener 21 to drive the fastener 21 to drive the proximal end of the femur to move toward the femoral body to a position that fits the femoral body.

[0035] The proximal femoral intramedullary nail provided in this embodiment is applied, and the proximal femoral intramedullary nail includes an intramedullary nail body 10 and a fixing assembly 20. The intramedullary nail body 10 can be vertically penetrated in the femoral body, the first end of the fastener 21 of the fixing assembly 20 can be penetrated in the proximal femur, and the first end of the fastener 21 can be connected to the proximal femur, the rotating member 22 can be rotatably penetrated on the intramedullary nail body 10, and the rotating member 22 and the fastener 21 are both obliquely penetrated on the intramedullary nail body 10, so that the rotating member Both 22 and the fastener 21 can be inserted into the proximal end of the femur. Since the first end of the fastener 21 is connected to the proximal end of the femur, the rotating member 22 can be rotatably set in the proximal end of the femur, but does not cooperate with the proximal end of the femur. The rotating member 22 can be drivingly connected with the second end of the fastener 21, so that during the rotation of the rotating member 22, the proximal end of the femur can be driven to move toward the direction of the femoral body, thereby ensuring that the fracture site of the proximal end of the femur is reset, so that the femoral body and the proximal end of the femur are fitted together. Specifically, when a fracture occurs between the proximal femur and the main body of the femur, it is necessary to first implant the intramedullary nail body 10 so that the intramedullary nail body 10 is installed in the main body of the femur, and then the fastener 21 is obliquely inserted into the intramedullary nail body 10 so that the first end of the fastener 21 is inserted into the proximal femur and connected to the proximal femur, and then the rotating member 22 is obliquely inserted into the intramedullary nail body 10 so that the rotating member 22 can be rotatably set on the intramedullary nail body 10, and the rotating member 22 can be driven and cooperated with the second end of the fastener 21, so that when the rotating member 22 rotates, the fastener 21 can be driven to move, and then the proximal femur can be reset, so that the proximal femur is fitted with the main body of the femur, ensuring that the proximal femoral intramedullary nail can fix and reset the fracture site.

[0036] It should be noted that the fastener 21 can be a first tension nail, the first end of which is inserted into the proximal end of the femur and connected to the proximal end of the femur, and the rotating member 22 can also be a second tension nail, which is rotatably arranged and driven by the first tension nail to drive the fastener 21 to move and drive the proximal end of the femur to fit the femoral body.

[0037] Among them, the shaft diameter of the intramedullary nail body 10 is generally between 9mm and 11mm, which is selected according to the diameter of the medullary cavity. The head diameter is between 13mm and 14mm to prevent overall sinking. There is an oblique combined compression tension screw hole at the proximal end. The oblique angle is generally about 130°, which is close to the human neck-shaft angle.

[0038] like Figures 3 to 8 As shown, the axis of the fastener 21 is parallel to the axis of the rotating member 22, a first thread segment 211 is provided on the second end of the fastener 21, and a second thread segment 221 is provided on the rotating member 22, and the second thread segment 221 is driven to cooperate with the first thread segment 211 to drive the fastener 21 to move. With the above structure, the axis of the fastener 21 is parallel to the axis of the rotating member 22, so that when the rotating member 22 rotates, the fastener 21 can move along its axis, thereby achieving the effect of resetting the proximal femur. Specifically, the second thread segment 221 is provided on the rotating member 22, and when the rotating member 22 rotates, the second thread segment 221 can cooperate with the first thread segment 211 of the fastener 21, so as to drive the fastener 21 to move along its axis direction to drive the proximal femur to achieve the effect of resetting.

[0039] like Figure 3 As shown, a stopper head 222 is provided at one end of the rotating member 22 corresponding to the second end of the fastener 21 . The stopper head 222 can cooperate with the intramedullary nail body 10 to limit the axial position of the rotating member 22 . By adopting the above structure, a stop head 222 is provided on the rotating member 22. When the rotating member 22 is inserted into the intramedullary nail body, the stop head 222 can cooperate with the intramedullary nail body 10 for stopping, so that the distance that the rotating member 22 is inserted into the intramedullary nail body 10 can be limited, and the rotating member 22 can also be stopped. When the rotating member 22 rotates, the rotating member 22 only rotates on the intramedullary nail body 10 under the action of the stop head 222, and there is no relative movement between the rotating member 22 and the intramedullary nail body 10, and the second thread segment 221 of the rotating member 22 can be driven and cooperated with the first thread segment 211, thereby driving the fastener 21 to move relative to the intramedullary nail body 10, so that the proximal end of the femur connected to the first end of the fastener 21 can be reset.

[0040] like Figure 3As shown, the first end of the fastener 21 is provided with a third thread segment 212, and the third thread segment 212 is configured to be connected to the proximal end of the femur, and the third thread segment 212 is a porous mesh structure. With the above structure, by providing the third thread segment 212 at the first end of the fastener 21, the third thread segment 212 can be tightly connected to the proximal end of the femur under the action of the third thread segment 212, and the third thread segment 212 is set as a porous mesh structure, which can not only facilitate bone ingrowth, so that the proximal end of the femur is connected and fixed to the first end of the fastener 21, but also play a role in bearing pressure.

[0041] It should be noted that the porous mesh structure can be processed and manufactured by additive manufacturing and has the following characteristics: Promote bone healing: 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. Reduce pressure: 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. Improve stability: 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.

[0042] like Figures 4 to 7 As shown, the fastener 21 is provided with an arc groove 213, the outer side wall of the rotating member 22 is fitted with the arc groove 213, and the first thread segment 211 is arranged in the arc groove 213. With the above structure, the arc groove 213 provided on the fastener 21 can fit with the outer side wall of the rotating member 22, so that the arc groove 213 can play a role of avoiding the outer side wall of the rotating member 22, avoiding the interference between the rotating member 22 and the fastener 21, and can also facilitate the driving cooperation between the first thread segment 211 and the second thread segment 221 of the rotating member 22.

[0043] like Figures 3 to 8As shown, the fastener 21 includes a first connecting rod 214 and a second connecting rod 215 which are coaxially and detachably arranged, and a pull rod 216 for connecting the first connecting rod 214 and the second connecting rod 215, the third threaded segment 212 is arranged on the first connecting rod 214, the first threaded segment 211 is arranged on the second connecting rod 215, the first connecting rod 214 is provided with a first connecting hole 2141, the second connecting rod 215 is penetrated by a second connecting hole 2151, the axis of the first connecting hole 2141 coincides with the axis of the second connecting hole 2151, and the pull rod 216 is sequentially connected to the second connecting hole 2151 and the first connecting hole 2141. By using the above-mentioned fastener 21, the first connecting rod 214 and the second connecting rod 215 are coaxially and detachably arranged, so that when the fastener 21 is inserted into the proximal end of the femur, the first connecting rod 214 and the second connecting rod 215 are connected together by the pull rod 216. When the first connecting rod 214 and the second connecting rod 215 need to be disassembled, only the pull rod needs to be disassembled to realize the disassembly of the first connecting rod 214 and the second connecting rod 215. In addition, a third threaded section 212 is provided on the first connecting rod 214, so that the first connecting rod 214 can be connected to the proximal end of the femur. The first threaded section 211 is provided on the second connecting rod 215, so that the second threaded section 221 of the rotating member 22 can be driven and cooperated with the first threaded section 211, thereby driving the first connecting rod 214 and the second connecting rod 215 to move together, thereby resetting the proximal end of the femur. Specifically, a first connecting hole 2141 is provided on the first connecting rod 214, and a second connecting hole 2151 is provided on the second connecting rod 215. When the first connecting rod 214 and the second connecting rod 215 are installed and fixed, the pull rod 216 needs to be passed through the second connecting hole 2151 and the first connecting hole 2141 in sequence, so as to facilitate the disassembly and installation of the fastener 21, thereby making the assembly method convenient.

[0044] like Figures 6 to 8 As shown, a buckle structure 30 is provided between the end of the first connecting rod 214 and the end of the second connecting rod 215, so that the first connecting rod 214 and the second connecting rod 215 are connected by buckling. By providing the buckle structure 30 between the end of the first connecting rod 214 and the end of the second connecting rod 215, when the first connecting rod 214 and the second connecting rod 215 are installed, the buckle structure 30 can play a role in positioning and also play a role in limiting and fixing, so that the subsequent pull rod 216 can be sequentially passed through the second connecting rod 215 and the first connecting rod 214, and after the pull rod 216 is removed from the first connecting rod 214 and the second connecting rod 215, the buckle structure 30 only needs to be unlocked to realize the disassembly process, and the installation and disassembly of the fastener 21 are completed.

[0045] like Figures 6 to 8As shown, the snap-fit ​​structure 30 includes a snap-fit ​​groove 31 and a snap-fit ​​buckle 32. A mounting hole 2142 is provided at the end of the first connecting rod 214. The mounting hole 2142 is communicated with the first connecting hole 2141. The aperture of the mounting hole 2142 is larger than the aperture of the first connecting hole 2141. The snap-fit ​​groove 31 is provided on the inner side wall of the mounting hole 2142. The snap-fit ​​buckle 32 is provided on the end of the second connecting rod 215. The snap-fit ​​buckle 32 extends into the mounting hole 2142 and is snap-connected with the snap-fit ​​groove 31. By adopting the above-mentioned snap-fit ​​structure 30, the mounting hole 2142 is connected to the first connecting hole 2141, and the aperture of the mounting hole 2142 is larger than the aperture of the first connecting hole 2141, so that the snap-fit ​​buckle 32 on the end of the second connecting rod 215 can penetrate into the mounting hole 2142 and be snap-connected with the snap-fit ​​groove 31 on the side wall of the mounting hole 2142, so that the snap-fit ​​method is convenient and can also play an anti-rotation role to prevent the first connecting rod 214 from rotating relative to the second connecting rod 215.

[0046] like Figures 6 to 8 As shown, the mounting hole 2142 is a waist-shaped hole, and the second connecting rod 215 is provided with a waist-shaped sleeve 2152 that matches the waist-shaped hole, and the waist-shaped sleeve 2152 is provided with a mounting notch. The snap-fit ​​buckle 32 includes a connecting plate 321 and a snap-fit ​​block 322. The connecting plate 321 is arranged at the mounting notch, and the snap-fit ​​block 322 is arranged on the end of the connecting plate 321 facing the first connecting rod 214. By setting the mounting hole 2142 as a waist-shaped hole, the waist-shaped sleeve 2152 on the second connecting rod 215 can be deeply extended into the mounting hole 2142, and the snap-on block 322 of the snap-on buckle 32 can be snap-fitted with the snap-on groove 31, and the connecting plate 321 can swing in the mounting notch. When the waist-shaped sleeve 2152 is extended into the mounting hole 2142, the connecting plate 321 can swing toward the axial direction of the second connecting rod 215, so that the snap-on block 322 can slide along the inner wall of the mounting hole 2142. When the snap-on block 322 is extended into the snap-on groove 31, the connecting plate 321 is reset, thereby ensuring that the first connecting rod 214 and the second connecting rod 215 are snap-connected under the action of the snap-on structure 30.

[0047] Furthermore, a drug loading chamber is provided on the end face of the second connecting rod 215 facing the first connecting rod 214, and a drug releasing hole is provided on the drug loading chamber. When the first connecting rod 214 and the second connecting rod 215 are connected by the buckle structure 30, the end face of the first connecting rod 214 facing the second connecting rod 215 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 first connecting rod 214 and the second connecting rod 215 are connected by the buckle structure 30, the first connecting rod 214 and the second connecting rod 215 are abutted, so that the first connecting rod 214 can squeeze the drug loading chamber on the second connecting rod 215, 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.

[0048] 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 by abutment 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.

[0049] In this embodiment, one end of the pull rod 216 extending into the first connection hole 2141 is provided with an external thread, and the first connection hole 2141 is provided with an internal thread, and the external thread matches the internal thread, so that the first connection rod 214 is connected to the second connection rod 215. The external thread of the pull rod 216 is threadedly matched with the internal thread of the first connection hole 2141, so that the pull rod 216 is conveniently passed through the second connection rod 215 and the first connection rod 214 in sequence, and the pull rod 216 is threadedly connected to the first connection rod 214, so that the first connection rod 214 and the second connection rod 215 are conveniently assembled and fixed under the action of the pull rod 216.

[0050] like Figure 1 and Figure 2 As shown, the proximal femoral intramedullary nail also includes a transverse locking screw 40. A fixing hole is provided on the intramedullary nail body 10, and the transverse locking screw 40 is transversely penetrated in the fixing hole. By transversely penetrating the transverse locking screw 40 in the fixing hole, the intramedullary nail body 10 can be easily fixed.

[0051] It should be noted that the transverse locking screw 40 is a 5 mm diameter screw, which performs bicortical fixation at the distal end of the intramedullary nail body 10. The function of the transverse locking screw 40 is to provide distal transverse locking for the entire system, which can effectively increase the stability of the entire system.

[0052] Among them, a layer of porous elastic structure is provided at the end of the first connecting rod 214 and the end of the second connecting rod 215, in which growth factors are stored, generally bone morphogenetic protein (BMP) or vascular endothelial growth factor (VEGF) and other bone growth promoting drugs. After the pull rod 216 is removed, the first connecting rod 214 and the second connecting rod 215 are connected by the buckle structure 30, which will cause mutual squeezing, thereby accelerating the release of the drugs. At the same time, its elastic structure also makes it possible to increase a certain elastic buffer when the two parts collide with each other during the walking action of the human body after it is implanted in the human body.

[0053] Specifically, for the porous elastic structure, a polymer with shape memory is selected, such as polycaprolactone (PCL) or polylactic acid (PLA), which can change shape after extrusion or external stimulation, and release the growth factors stored inside it after the shape is restored. Growth factor storage: The growth factor is embedded in the interior of the polymer. This can be done by dissolving the growth factor in a solvent for the polymer and mixing the solution with the polymer during the preparation process so that the growth factor is evenly distributed inside the polymer. Another method is to encapsulate the growth factor in nanoparticles or microspheres and then embed these carriers into the polymer. Shape memory design: The shape memory structure of the polymer is designed so that it is extruded and deformed when subjected to external pressure or stimulation, resulting in the release of the growth factor inside the polymer. Release control: The shape memory structure of the polymer and the storage method of the growth factor are designed according to actual needs to achieve control of the release of the growth factor. The release amount can be selected by the amount of growth factor required by the patient, so as to achieve precise control. Moreover, when the drug-carrying part is not squeezed, it will flow to the outside of the implant along with the flow of body fluids, and the outflow of growth factors can be better promoted by continuous squeezing between each other. 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 outflow of growth factors becomes smaller, thereby achieving a growth factor outflow rate that matches the healing speed of the fracture area; when the patient needs to remove the proximal femoral intramedullary nail due to bone healing or other conditions, this split structure can ensure the removal of all parts except the first connecting rod 214, and the first connecting rod 214, due to its porous structure, makes this part completely fused with the proximal femur, and its retention in the proximal femur does not affect the overall structure of the patient's femur.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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: An intramedullary nail body (10) is configured to be vertically penetrated into a femoral body; A fixing assembly (20), comprising a fastener (21) and a rotating member (22), wherein the fastener (21) and the rotating member (22) are both obliquely inserted into the intramedullary nail body (10), the first end of the fastener (21) being configured to be inserted into the proximal end of the femur and connected to the proximal end of the femur, and the rotating member (22) being rotatably arranged on the intramedullary nail body (10) and drivingly cooperating with the second end of the fastener (21), so as to drive the fastener (21) to drive the proximal end of the femur to move toward the femoral body to a position in contact with the femoral body; The fastener (21) comprises a first connecting rod (214) and a second connecting rod (215) which are coaxially and detachably arranged, and a buckle structure (30) is arranged between the end of the first connecting rod (214) and the end of the second connecting rod (215) so as to enable the first connecting rod (214) and the second connecting rod (215) to be connected by a buckle connection; A drug loading chamber is arranged on the end face of the second connecting rod (215) facing the first connecting rod (214); the drug loading chamber is a porous elastic structure, and a drug releasing hole is arranged on the drug loading chamber. When the first connecting rod (214) and the second connecting rod (215) are connected via the buckle structure (30), the first connecting rod (214) squeezes the drug loading chamber on the end face of the second connecting rod (215) to release the drug in the drug loading chamber through the drug releasing hole.

2. The proximal femoral intramedullary nail according to claim 1, characterized in that: The axis of the fastener (21) is parallel to the axis of the rotating member (22); a first thread segment (211) is provided on the second end of the fastener (21); a second thread segment (221) is provided on the rotating member (22); the second thread segment (221) cooperates with the first thread segment (211) to drive the fastener (21) to move.

3. The proximal femoral intramedullary nail according to claim 2, characterized in that: An end of the rotating member (22) corresponding to the second end of the fastener (21) is provided with a stop head (222), and the stop head (222) can cooperate with the intramedullary nail body (10) to limit the axial position of the rotating member (22).

4. The proximal femoral intramedullary nail according to claim 3, characterized in that: The first end of the fastener (21) is provided with a third thread segment (212), the third thread segment (212) being configured to be connected to the proximal end of the femur, and the third thread segment (212) being a porous grid structure.

5. The proximal femoral intramedullary nail according to claim 4, characterized in that: The fastener (21) is provided with an arc-shaped groove (213), the outer side wall of the rotating member (22) is in contact with the arc-shaped groove (213), and the first threaded section (211) is arranged in the arc-shaped groove (213).

6. The proximal femoral intramedullary nail according to claim 4, characterized in that: The fastener (21) comprises a pull rod (216) for connecting the first connecting rod (214) and the second connecting rod (215); the third threaded section (212) is arranged on the first connecting rod (214); the first threaded section (211) is arranged on the second connecting rod (215); a first connecting hole (2141) is arranged on the first connecting rod (214); a second connecting hole (2151) is arranged through the second connecting rod (215); the axis of the first connecting hole (2141) coincides with the axis of the second connecting hole (2151); and the pull rod (216) is connected in sequence to the second connecting hole (2151) and the first connecting hole (2141).

7. The proximal femoral intramedullary nail according to claim 6, characterized in that: The buckle structure (30) comprises a buckle groove (31) and a buckle (32); a mounting hole (2142) is provided at the end of the first connecting rod (214); the mounting hole (2142) is communicated with the first connecting hole (2141); the diameter of the mounting hole (2142) is larger than the diameter of the first connecting hole (2141); the buckle groove (31) is provided on the inner side wall of the mounting hole (2142); the buckle (32) is provided on the end of the second connecting rod (215); the buckle (32) extends into the mounting hole (2142) and is buckled and connected with the buckle groove (31).

8. The proximal femoral intramedullary nail according to claim 7, characterized in that: The mounting hole (2142) is a waist-shaped hole, the second connecting rod (215) is provided with a waist-shaped sleeve (2152) matching the waist-shaped hole, the waist-shaped sleeve (2152) is provided with a mounting notch, the snap-fit ​​buckle (32) comprises a connecting plate (321) and a snap-fit ​​block (322), the connecting plate (321) is provided at the mounting notch, and the snap-fit ​​block (322) is provided on the end of the connecting plate (321) facing the first connecting rod (214).

9. The proximal femoral intramedullary nail according to claim 6, characterized in that: One end of the pull rod (216) extending into the first connecting hole (2141) is provided with an external thread, and the first connecting hole (2141) is provided with an internal thread, and the external thread cooperates with the internal thread to connect the first connecting rod (214) with the second connecting rod (215).

10. The proximal femoral intramedullary nail according to claim 1, characterized in that: The proximal femoral intramedullary nail further comprises a transverse locking screw (40); a fixing hole is provided on the intramedullary nail body (10); and the transverse locking screw (40) is transversely inserted into the fixing hole.

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