A PFNA femoral intramedullary nail

Abstract

The present invention provides a PFNA femoral intramedullary nail, belonging to the technical field of medical devices. It includes a main nail and a spiral blade nail connected to each other for fixing a fractured femur; and a thrust rod for providing an expansion force to the spiral blade nail. By setting the spiral blade nail, the present invention increases the contact force points between the spiral blade nail and the femur, improves the pulling force of the spiral blade nail, avoids the displacement of the spiral blade nail during use, and also avoids the tearing of the fracture site of the patient's femur and the action site of the spiral blade, further avoiding secondary injury to the patient's bone. It improves the connection between the spiral blade nail and the main nail, avoids the detachment and displacement of the spiral blade nail from the main nail during pulling, enhances the pulling force at the tail of the spiral blade nail, and avoids the displacement of its tail under the condition of overload pulling. By setting the thrust rod, the riveting force between the spiral blade nail and the femur can be adjusted, enabling it to be suitable for use by the elderly with different bone qualities.

Description

Technical Field

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

[0002] Intertrochanteric fractures of the femur are a common fracture phenomenon in the elderly. Most patients are of advanced age, have poor bone quality, and have obvious osteoporosis. When fractures occur, femoral intramedullary nails are usually used to fix the femur through surgery to ensure the recovery and growth of the fracture site.

[0003] Most of the spiral blade nails in the existing PFNA femoral intramedullary nails adopt spiral blade technology to enhance the riveting force through spiral blades, so as to be applicable to fracture patients with osteoporosis, unstable fractures, etc. However, the degree of osteoporosis in the elderly varies. Especially for the elderly with poor bone quality, in the actual use process, the spiral blade nail is mainly used for tension. However, due to the small contact force point between the spiral blade and the femur, under the action of osteoporosis, the spiral blade nail will be displaced, causing tearing at the fracture site of the patient's femur and the action site of the spiral blade, resulting in secondary injury to the patient's bone. At the same time, the connection between the spiral blade nail and the femoral intramedullary nail is relatively weak. During the tension process, the spiral blade nail will break away from and shift out of the insertion hole of the femoral intramedullary nail, thereby causing damage to the femur. Moreover, the tail of the spiral blade nail is a flat section, which cannot provide tension, and further will cause the spiral blade nail to be displaced due to insufficient tension. Therefore, the present application provides a PFNA femoral intramedullary nail to meet the needs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a PFNA femoral intramedullary nail to solve the problem that the existing spiral blade nail is mainly used for tension. However, due to the small contact force point between the spiral blade and the femur, under the action of osteoporosis, the spiral blade nail will be displaced, causing tearing at the fracture site of the patient's femur and the action site of the spiral blade, resulting in secondary injury to the patient's bone. At the same time, the connection between the spiral blade nail and the femoral intramedullary nail is relatively weak. During the tension process, the spiral blade nail will break away from and shift out of the insertion hole of the femoral intramedullary nail, thereby causing damage to the femur. Moreover, the tail of the spiral blade nail is a flat section, which cannot provide tension, and further will cause the spiral blade nail to be displaced due to insufficient tension when the connection point with the femoral intramedullary nail is weak.

[0005] To solve the above technical problem, the present invention provides the following technical solutions:

[0006] A PFNA femoral intramedullary nail comprises: a main nail and a spiral blade nail connected to each other, used for fixing a broken femur; a thrust rod for providing expansion force for the spiral blade nail, the thrust rod being connected to the spiral blade nail; the spiral blade nail comprises a first pipe section, a first expansion mechanism, a second pipe section, a spiral nail head, a second expansion mechanism and a third expansion mechanism connected to each other, a plurality of first reinforcing ribs are arranged on the first pipe section, and a second reinforcing rib is arranged on the second pipe section; the thrust rod comprises a first column, a second column, a third column, a fourth column, a fifth column, a sixth column, a seventh column, an eighth column connected to each other, a connecting section, a screw rod and a rod tail, including a nail body nailed in the femur, a socket is provided on the nail body, a concave annular groove is provided in the socket, and an anti-slip groove is provided in the annular groove.

[0007] Optionally, the first expansion mechanism includes an expansion frame, a support expansion assembly and an expansion ring that are connected to each other, and the outer side wall of the expansion ring is in conflict with the inner side wall of the expansion frame.

[0008] Optionally, the expansion frame includes a pair of connected first rings and multiple expansion plates, and the pair of first rings are fixedly connected to the first pipe section and the second pipe section respectively; the support and expansion assembly includes two connected groups of rings, multiple expansion frames, multiple push plates and multiple resistance plates.

[0009] Optionally, the outward expansion plate includes an arc-shaped piece fixedly connected between a pair of the first rings, and a weakening groove is provided at the middle section of the arc-shaped piece.

[0010] Optionally, the collar comprises an arcuate sleeve fixedly connected to the inner wall of the resistance plate, an arcuate sleeve rod inserted into the cavity thereof is arranged between two adjacent arcuate sleeves, a guide groove is provided in the arcuate sleeve, a guide bar is provided in the guide groove, and the guide bar is fixedly connected to the arcuate sleeve rod; a plurality of reinforcing sections are arranged on the expansion frame; the inner wall of the push plate is fixedly connected to the expansion frame through a fixed sleeve fixedly connected, and the outer wall of the push plate is fixedly connected to the inner wall of the expansion ring; the resistance plate comprises a fixed section, a first inclined section and a flanging section connected to each other, the fixed section is fixedly connected to the arcuate sleeve, and the flanging section is clamped in a limiting groove provided on the inner wall of the first pipe section.

[0011] Optionally, the second expansion mechanism includes a second ring and a plurality of outward expansion short plates connected to each other, the second ring is fixedly connected to an end of the first tube section away from the spiral nail head; the outward expansion short plate includes a connecting section and a plurality of second inclined sections connected to each other.

[0012] Optionally, the third expansion mechanism includes a connected elastic sheet and a resistance block, and a waist-shaped limiting hole opened on the first pipe section, the waist-shaped limiting hole is located in the insertion hole, the outer end of the resistance block passes through the waist-shaped limiting hole, and a plurality of anti-sliding blocks are fixedly connected to the outer end of the resistance block, and the anti-sliding blocks are in resistance with the anti-slip groove; the elastic sheet includes a connected force-bearing section and a pair of U-shaped sections, and the U-shaped section is fixedly connected to the first pipe section.

[0013] Optionally, the diameter of the thrust rod is gradually decreased from the first cylinder along the second cylinder, the third cylinder, the fourth cylinder, the fifth cylinder, the sixth cylinder, the seventh cylinder and the eighth cylinder.

[0014] Optionally, the outer end diameter of the rod tail is larger than the inner end diameter, the outer wall of the rod tail conflicts with the inner wall of the outwardly expanded short plate, the screw rod is threadedly connected to the first pipe section through a thread, the outer wall of the first column conflicts with the inner wall of the force-bearing section, and the outer wall of the fourth column conflicts with the inner wall of the fixed section.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects:

[0016] In the above scheme, by arranging the spiral blade nail, during use, when the first inclined section is squeezed, the fixed section will drive the arc sleeve rod to move out of the arc sleeve, thereby causing the circular cavity to expand outward, and the expansion will drive the support frame to move outward together with the push plate, thereby causing the expansion ring to expand outward, and further, the expansion frame will be squeezed by external force, and the arc sheet will be deformed when the weakened groove is squeezed and bent, and expand outward. When the force-bearing section is squeezed, the U-shaped section will be squeezed and deformed, and at the same time, the resistance block will pass through the waist-shaped limiting hole. The resistance block will be connected and strengthened with the main nail through the anti-slip block and the anti-slip groove. When the second inclined section is squeezed When expanding outward, the gap between the adjacent second inclined sections will become larger, thereby allowing the outward expansion short plate to expand outward, thereby increasing the contact force point between the spiral blade nail and the femur, improving the pulling force of the spiral blade nail, and avoiding displacement of the spiral blade nail during use. At the same time, it also avoids tearing at the fracture of the patient's femur and the point where the spiral blade acts, further avoiding secondary injury to the patient's bones, improving the connection between the spiral blade nail and the main nail, avoiding the spiral blade nail from detaching from and shifting from the main nail when tension is applied, and enhancing the pulling force at the tail of the spiral blade nail, avoiding displacement of the tail when tension is overloaded.

[0017] By setting a thrust rod and using it in cooperation with a spiral blade nail, during the use process, when the seventh cylinder abuts against the first inclined section, the fixed section will drive the arc-shaped sleeve and the arc-shaped sleeve rod to expand in the first stage. Furthermore, the support and expansion frame and the push plate will push the outer expansion ring to expand in the first stage. Further, the outer expansion frame will expand in the first stage. When the sixth cylinder abuts against the first inclined section, through the above operation process, the outer expansion frame will expand in the second stage. When the fifth cylinder abuts against the first inclined section, through the above operation process, the outer expansion frame will expand in the third stage. When the fourth cylinder abuts against the first inclined section, through the above operation process, the outer expansion frame will expand in the fourth stage. When the second cylinder abuts against the stress section, the abutting block will strengthen the connection with the main nail in the first stage through the anti-slip block and the anti-slip groove. When the first cylinder abuts against the stress section, the abutting block will strengthen the connection with the main nail in the second stage through the anti-slip block and the anti-slip groove. When the rod tail moves towards the first pipe section, the outer expansion short plate will expand and become larger as the rod tail moves. Further, while the outer expansion frame and the outer expansion short plate can expand, the expansion size can be adjusted. At the same time, while the connection between the spiral blade nail and the main nail is tightened, the tightness can be adjusted. Thus, the riveting force between the spiral blade nail and the femur can be adjusted, enabling it to be suitable for use by the elderly with different bone qualities. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings incorporated herein and constituting a part of the specification illustrate embodiments of the present disclosure and, together with the specification, further serve to explain the principles of the present disclosure and enable those skilled in the relevant art to implement and use the present disclosure.

[0019] Figure 1 It is a three-dimensional structural schematic diagram of a PFNA femoral intramedullary nail;

[0020] Figure 2 is Figure 1 the cross-sectional structural schematic diagram of;

[0021] Figure 3 is Figure 2 the enlarged structural schematic diagram at A in;

[0022] Figure 4 is Figure 2 the enlarged structural schematic diagram at B in;

[0023] Figure 5 is Figure 2 the enlarged structural schematic diagram at C in;

[0024] Figure 6 is the enlarged cross-sectional structural schematic diagram of the main nail;

[0025] Figure 7 is the enlarged three-dimensional structural schematic diagram of the outer expansion frame;

[0026] Figure 8 It is a schematic diagram of the enlarged three-dimensional structure of the outer expansion circle;

[0027] Figure 9 It is an enlarged three-dimensional structural schematic diagram of the thrust rod;

[0028] Figure 10 is an enlarged three-dimensional structural schematic diagram;

[0029] Figure 11 It is a schematic diagram of the enlarged three-dimensional structure of the support and expansion component.

[0030] [Reference Signs]

[0031] 1. Main nail; 11. Nail body; 12. Insert hole; 13. Annular groove; 14. Anti-skid groove; 2. Spiral blade nail; 21. First pipe section; 21. First pipe section; 22. First expansion mechanism; 221. External expansion frame; 2211. First ring; 2212. External expansion plate; 22121. Arc sheet; 22122. Weakened groove; 222. Support and expansion assembly; 2221. Ring; 22211. Arc sleeve; 22212. Arc sleeve rod; 2222. Support and expansion frame; 2223. Push plate; 2224. Contact plate; 22241. Fixed section; 22242. First inclined section; 22243. Flanging section; 22 25. Reinforcement section; 2226. Fixed sleeve; 223. Outward expansion ring; 23. Second pipe section; 24. Screw head; 25. First reinforcing rib; 26. Second expansion mechanism; 261. Second ring; 262. Outward expansion short plate; 27. Third expansion mechanism; 271. Elastic sheet; 2711. Force section; 2712. U-shaped section; 272. Resistance block; 273. Anti-sliding block; 3. Thrust rod; 31. First column; 32. Second column; 33. Third column; 34. Fourth column; 35. Fifth column; 36. Sixth column; 37. Seventh column; 38. Eighth column; 39. Screw; 310. Rod tail.

[0032] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments, and the adjustments or modifications made are still included in the scope of the attached claims. DETAILED DESCRIPTION

[0033] The following will describe in detail a PFNA femoral intramedullary nail provided by the present invention in conjunction with the accompanying drawings and specific embodiments. At the same time, it should be noted here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments. For some well-known technologies, those skilled in the art can also adopt other alternative methods for implementation; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0034] It should be noted that in the specification, the mention of "an embodiment", "embodiments", "exemplary embodiments", "some embodiments", etc. indicates that the described embodiments may include specific features, structures or characteristics, but not necessarily every embodiment includes such specific features, structures or characteristics. Additionally, when combining embodiments to describe specific features, structures or characteristics, the implementation of such features, structures or characteristics in combination with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the relevant art.

[0035] Generally, terms can be understood at least in part from their use in context. For example, at least in part depending on the context, the term "one or more" used herein can be used to describe any feature, structure or characteristic in a singular sense, or can be used to describe a combination of features, structures or characteristics in a plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey a set of exclusive factors, but rather, at least in part depending on the context, can allow for the existence of other factors that may not be explicitly described.

[0036] It can be understood that the meanings of "on...", "above...", and "over..." in the present disclosure should be interpreted in the broadest manner, such that "on..." not only means "directly on" something, but also includes the meaning of being "on" something with intervening features or layers therebetween, and "above..." or "over..." not only means "above" or "over" something, but also can include the meaning of being "above" or "over" something with no intervening features or layers therebetween.

[0037] Furthermore, spatial relative terms such as "under...", "below...", "lower", "above...", "upper", etc. are used herein for convenience of description to describe the relationship between one element or feature and another or more elements or features, as shown in the accompanying drawings. The spatial relative terms are intended to cover different orientations in the use or operation of the device in addition to the orientation depicted in the drawings. The device can be oriented in other ways, and the spatial relative descriptive terms used herein can be correspondingly interpreted similarly.

[0038] As Figures 1 to 11As shown, an embodiment of the present invention provides a PFNA femoral intramedullary nail, including: a main nail 1 and a spiral blade nail 2 connected to each other for fixing a fractured femur; the main nail 1 includes a nail body 11 inserted into the femur, and a socket 12 is provided on the nail body 11. An annular groove 13 is provided in the socket 12 and is arranged in a concave shape. An anti-slip groove 14 is provided in the annular groove 13. The spiral blade nail 2 includes a spiral nail head 24, a second pipe section 23, a first expansion mechanism 22, a first pipe section 21, a third expansion mechanism 27 and a second expansion mechanism 26 connected to each other. A plurality of first reinforcing ribs 25 are provided on the first pipe section 21. The first expansion mechanism 22 includes an outer expansion frame 221, a support expansion assembly 222 and an outer expansion ring 223 connected to each other. The outer side wall of the outer expansion ring 223 abuts against the inner side wall of the outer expansion frame 221. A second reinforcing rib is provided on the second pipe section 23.

[0039] As Figure 3 and Figure 7 shown, the outer expansion frame 221 includes a pair of first ring circles 2211 and a plurality of outer expansion plates 2212 connected to each other. The pair of first ring circles 2211 are respectively fixedly connected to the first pipe section 21 and the second pipe section 23; the outer side wall of the outer expansion plate 2212 is in the same horizontal plane as the outer side walls of the first pipe section 21 and the second pipe section 23 in the initial state.

[0040] By providing the outer expansion frame 221, during use, when the outer expansion frame 221 is in a state of being extruded by an external force, when the weakening groove 22122 is squeezed and bent, the arc-shaped piece 22121 will deform and expand, thereby increasing the contact points between the spiral blade nail 2 and the femur, improving the pulling force of the spiral blade nail 2, avoiding the displacement of the spiral nail head 24 during use, and at the same time avoiding the tearing of the fracture site of the patient's femur and the action site of the spiral blade, and further avoiding secondary injury to the patient's bone.

[0041] As Figure 2 、 Figure 3 、 Figure 11As shown, the expanding assembly 222 includes two sets of connected collars 2221, a plurality of expanding frames 2222, a plurality of push plates 2223, and a plurality of abutting plates 2224. The outer expanding plate 2212 includes an arc-shaped piece 22121 fixedly connected between a pair of first ring circles 2211. A weakening groove 22122 is provided at the middle section of the arc-shaped piece 22121. The collar 2221 includes an arc-shaped sleeve 22211 fixedly connected to the inner side wall of the abutting plate 2224. An arc-shaped sleeve rod 22212 inserted into its cavity is provided between two adjacent arc-shaped sleeves 22211. A guiding groove is formed in the arc-shaped sleeve 22211, and a guiding strip is arranged in the guiding groove. The guiding strip is fixedly connected to the arc-shaped sleeve rod 22212. This is the prior art and is not shown in the figure. A circular cavity is formed by a plurality of arc-shaped sleeves 22211 and a plurality of arc-shaped sleeve rods 22212. A plurality of strengthening sections 2225 are arranged on the expanding frame 2222. The inner side wall of the push plate 2223 is fixedly connected to the expanding frame 2222 through a fixedly connected fixing sleeve 2226. The outer side wall of the push plate 2223 is fixedly connected to the inner side wall of the outer expanding ring 223. The outer expanding ring 223 is made of an elastic material. The outer side wall of the outer expanding ring 223 abuts against the middle section of the inner side wall of the arc-shaped piece 22121, and the middle section of the outer side wall of the outer expanding ring 223 is adapted to the inner side wall of the weakening groove 22122. The abutting plate 2224 includes a connected fixing section 22241, a first inclined section 22242, and a flanging section 22243. The fixing section 22241 is fixedly connected to the arc-shaped sleeve 22211. The flanging section 22243 is clamped in a limiting card slot formed in the inner side wall of the first pipe section 21.

[0042] By providing the expanding assembly 222 and the outer expanding ring 223, during use, when the first inclined section 22242 is squeezed, the fixing section 22241 will drive the arc-shaped sleeve rod 22212 to move out of the arc-shaped sleeve 22211, and then the circular cavity will expand outward. When it expands outward, it will drive the expanding frame 2222 and the push plate 2223 to move outward together, and then the outer expanding ring 223 will expand outward, so that the outer expanding frame 221 will be squeezed.

[0043] As Figure 5 shown, the second expanding mechanism 26 includes a connected second ring circle 261 and a plurality of outer expanding short plates 262. The second ring circle 261 is fixedly connected to one end of the first pipe section 21 away from the screw head 24. The outer expanding short plate 262 includes a connected connecting section and a plurality of second inclined sections.

[0044] By providing the second expanding mechanism 26, during use, when the second inclined section is squeezed and expanded, the gap between adjacent second inclined sections will become larger, and then the outer expanding short plate 262 can expand outward, thereby enhancing the pulling force at the tail of the spiral blade nail 2 and avoiding the displacement of its tail under the condition of overloaded pulling force.

[0045] As Figure 10As shown, the third expansion mechanism 27 includes a connected elastic sheet 271 and a resistance block 272, and a waist-shaped limiting hole opened on the first pipe section 21, the waist-shaped limiting hole is located in the plug hole 12, the outer end of the resistance block 272 passes through the waist-shaped limiting hole, and a plurality of anti-sliding blocks 273 are fixedly connected to the outer end of the resistance block 272, and the anti-sliding blocks 273 are in resistance with the anti-slip groove 14; the elastic sheet 271 includes a connected force-bearing section 2711 and a pair of U-shaped sections 2712, and the U-shaped section 2712 is fixedly connected to the first pipe section 21.

[0046] By setting the third expansion mechanism 27, during use, when the force-bearing section 2711 is squeezed, the U-shaped section 2712 will be squeezed and deformed, and the resistance block 272 will pass through the waist-shaped limiting hole. The resistance block 272 will be connected and strengthened with the main nail 1 through the anti-slip block 273 and the anti-slip groove 14, thereby improving the connection between the spiral blade nail 2 and the main nail 1, and preventing the spiral blade nail 2 from detaching and shifting from the annular groove 13 when tension is applied.

[0047] like Figures 2 to 5 , Figure 9 As shown, the thrust rod 3 is used to provide expansion force for the spiral blade nail 2, and the thrust rod 3 is connected to the spiral blade nail 2, and the thrust rod 3 is inserted into the spiral blade nail 2; the thrust rod 3 includes a first cylinder 31, a second cylinder 32, a third cylinder 33, a fourth cylinder 34, a fifth cylinder 35, a sixth cylinder 36, a seventh cylinder 37, an eighth cylinder 38, a screw 39 and a rod tail 310 connected to each other, and the diameter of the thrust rod 3 is gradually reduced from the first cylinder 31 along the direction of the second cylinder 32, the third cylinder 33, the fourth cylinder 34, the fifth cylinder 35, the sixth cylinder 36, the seventh cylinder 37 and the eighth cylinder 38. The connection between the first cylinder 31 and the second cylinder 32, the connection between the second cylinder 32 and the third cylinder 33, the connection between the third cylinder 33 and the fourth cylinder 34, and the fourth cylinder 35 are connected to each other. The connection between the first column 31 and the fifth column 35, the connection between the fifth column 35 and the sixth column 36, the connection between the sixth column 36 and the seventh column 37, and the connection between the seventh column 37 and the eighth column 38 are all provided with a first connecting section, the connection between the first column 31 and the screw rod 39 is provided with a second connecting section, and the connection between the screw rod 39 and the rod tail 310 is provided with a third connecting section. The outer end diameter of the rod tail 310 is larger than the inner end diameter, and the diameter of the rod tail 310 is gradually reduced from the outer end along the direction close to the end of the screw rod 39. The outer wall of the rod tail 310 conflicts with the inner wall of the outward expansion short plate 262, the screw rod 39 is threadedly connected to the first pipe section 21 through a thread, the outer wall of the first column 31 fits with the inner side wall of the force-bearing section 2711, and the outer side wall of the fourth column 34 conflicts with the inner side wall of the fixing section 22241.

[0048] By setting the thrust rod 3, during use, when the seventh cylinder 37 abuts against the first inclined section 22242, the fixed section 22241 will drive the arc-shaped sleeve 22211 and the arc-shaped rod 22212 to expand in the first stage. Further, the support and expansion frame 2222 and the push plate 2223 will push the outer expansion ring 223 to expand in the first stage, and further, the outer expansion frame 221 will expand in the first stage. When the sixth cylinder 36 abuts against the first inclined section 22242, through the above operation process, the outer expansion frame 221 will expand in the second stage. When the fifth cylinder 35 abuts against the first inclined section 22242, through the above operation process, the outer expansion frame 221 will expand in the third stage. When the fourth cylinder 34 abuts against the first inclined stage, through the above operation process, the outer expansion frame 221 will expand in the fourth stage. When the second cylinder 32 abuts against the force-bearing section 2711, the abutting block 272 will strengthen the connection with the main nail 1 in the first stage through the anti-slip block 273 and the anti-slip groove 14. When the first cylinder 31 abuts against the force-bearing section 2711, the abutting block 272 will strengthen the connection with the main nail 1 in the second stage through the anti-slip block 273 and the anti-slip groove 14. When the rod tail 310 moves towards the first pipe section 21, the outer expansion short plate 262 will expand and become larger as the rod tail 310 moves. Further, when the outer expansion frame 221 and the outer expansion short plate 262 expand, the expansion size can be adjusted. At the same time, while the connection between the spiral blade nail 2 and the main nail 1 is tightened, the tightness can be adjusted, so that the riveting force between the spiral blade nail 2 and the femur can be adjusted to adapt to the use of the elderly with different bone qualities.

[0049] The technical solution provided by the present invention, by setting the spiral blade nail, during use, when the first inclined section is squeezed, the fixed section will drive the arc-shaped rod to move out of the arc-shaped sleeve, and further, the circular cavity will expand outwards. When it expands outwards, it will drive the support and expansion frame together with the push plate to move outwards, and further, the outer expansion ring will expand outwards. Further, when the outer expansion frame is in the state of being externally squeezed, when the weakening groove is squeezed and bent, the arc-shaped piece will deform and expand. When the force-bearing section is squeezed, the U-shaped section will be squeezed and deformed, and at the same time, the abutting block will pass through the kidney-shaped limiting hole, and the abutting block will strengthen the connection with the main nail through the anti-slip block and the anti-slip groove. When the second inclined section is externally squeezed and expanded, the gap between the adjacent second inclined sections will become larger, and further, the outer expansion short plate will expand outwards, thereby increasing the contact force points between the spiral blade nail and the femur, improving the pulling force of the spiral blade nail, avoiding the displacement of the spiral blade nail during use, and at the same time, avoiding the tearing of the fracture site of the patient's femur and the action site of the spiral blade, further avoiding the secondary injury of the patient's bone, improving the connection between the spiral blade nail and the main nail, avoiding the detachment and displacement of the spiral blade nail from the main nail during pulling, enhancing the pulling force at the tail of the spiral blade nail, and avoiding the displacement of its tail under the condition of overloading of the pulling force.

[0050] By setting a thrust rod and using it in conjunction with the spiral blade nail, during use, when the seventh column conflicts with the first inclined section, the fixed section will drive the arc sleeve and the arc sleeve rod to expand in the first stage, and then the support expansion frame and the push plate will push the outer expansion ring to expand in the first stage, and further the outer expansion frame will expand in the first stage. When the sixth column conflicts with the first inclined section, the outer expansion frame will expand in the second stage through the above operation process. When the fifth column conflicts with the first inclined section, the outer expansion frame will expand in the third stage through the above operation process. When the fourth column conflicts with the first inclined stage, the outer expansion frame will expand in the fourth stage through the above operation process. When the second column collides with the force-bearing section, the resistance block will be connected and strengthened with the main nail in the first stage through the anti-sliding block and the anti-slip groove. When the first column collides with the force-bearing section, the resistance block will be connected and strengthened with the main nail in the second stage through the anti-sliding block and the anti-slip groove. When the rod tail moves toward the first pipe section, the outward short plate will expand and become larger as the rod tail moves. Further, the outward expansion frame and the outward expansion short plate can be expanded and the expansion size can be adjusted at the same time. At the same time, the connection between the spiral blade nail and the main nail can be tightly connected, and the tightness can be adjusted, so that the riveting force between the spiral blade nail and the femur can be adjusted, so that it can be adapted for use by elderly people with different bone qualities.

[0051] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0052] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A PFNA femoral intramedullary nail, characterized in that include: The connected main nail and spiral blade nail are used for fractured femur fixation; A thrust rod, used for providing expansion force to the spiral blade nail, the thrust rod being connected to the spiral blade nail; The spiral blade nail comprises a first pipe section, a first expansion mechanism, a second pipe section, a spiral nail head, a second expansion mechanism and a third expansion mechanism connected to each other, the first pipe section is provided with a plurality of first reinforcing ribs, and the second pipe section is provided with a second reinforcing rib; The thrust rod comprises a first column, a second column, a third column, a fourth column, a fifth column, a sixth column, a seventh column, an eighth column, a connecting section, a screw rod and a rod tail which are connected to each other; The first expansion mechanism comprises an expansion frame, a support expansion assembly and an expansion ring connected to each other, and the outer side wall of the expansion ring is in conflict with the inner side wall of the expansion frame; The support and expansion assembly includes two sets of connected rings, a plurality of support and expansion frames, a plurality of push plates and a plurality of contact plates; The collar comprises an arc-shaped sleeve fixedly connected to the inner side wall of the abutment plate, an arc-shaped sleeve rod inserted into the cavity of two adjacent arc-shaped sleeves is arranged between the two adjacent arc-shaped sleeves, a guide groove is provided in the arc-shaped sleeve, a guide bar is arranged in the guide groove, and the guide bar is fixedly connected to the arc-shaped sleeve rod; The support and expansion frame is provided with a plurality of reinforcement sections; The inner side wall of the push plate is fixedly connected to the support frame through a fixed sleeve, and the outer side wall of the push plate is fixedly connected to the inner side wall of the outer expansion ring; The abutment plate comprises a fixed section, a first inclined section and a flanged section connected to each other, the fixed section is fixedly connected to the arc-shaped sleeve, and the flanged section is clamped in a limiting clamping groove provided on the inner side wall of the first pipe section; The diameter of the thrust rod is gradually decreased from the first cylinder along the second cylinder, the third cylinder, the fourth cylinder, the fifth cylinder, the sixth cylinder, the seventh cylinder and the eighth cylinder.

2. The PFNA femoral intramedullary nail according to claim 1, characterized in that, The main nail comprises a nail body nailed in the femur, the nail body is provided with an insertion hole, an annular groove arranged in an inward concave shape is arranged in the insertion hole, and an anti-slip groove is arranged in the annular groove.

3. The PFNA femoral intramedullary nail according to claim 1, characterized in that, The external expansion frame includes a pair of first rings and a plurality of external expansion plates connected to each other, and the pair of first rings are fixedly connected to the first pipe section and the second pipe section respectively.

4. The PFNA femoral intramedullary nail according to claim 3, characterized in that, The outward expansion plate comprises an arc-shaped piece fixedly connected between a pair of the first rings, and a weakening groove is arranged at the middle section of the arc-shaped piece.

5. The PFNA femoral intramedullary nail according to claim 2, wherein The second expansion mechanism comprises a second ring and a plurality of outward expansion short plates connected to each other, wherein the second ring is fixedly connected to an end of the first pipe section away from the spiral nail head; The outwardly expanded short plate includes a connecting section and a plurality of second inclined sections that are connected to each other.

6. The PFNA femoral intramedullary nail according to claim 5, characterized in that, The third expansion mechanism includes a connected elastic sheet and a resistance block, and a waist-shaped limiting hole opened on the first pipe section, the waist-shaped limiting hole is located in the insertion hole, the outer end of the resistance block passes through the waist-shaped limiting hole, and a plurality of anti-sliding blocks are fixedly connected to the outer end of the resistance block, and the anti-sliding blocks are in resistance with the anti-slip groove; The elastic sheet comprises a force-bearing section and a pair of U-shaped sections connected to each other, and the U-shaped sections are fixedly connected to the first pipe section.

7. The PFNA femoral intramedullary nail according to claim 6, wherein The outer end diameter of the rod tail is larger than the inner end diameter. The outer wall of the rod tail abuts against the inner wall of the outwardly expanding short plate. The screw rod is threadedly connected to the first pipe section through threads. The outer wall of the first cylinder abuts against the inner side wall of the stress section. The outer side wall of the fourth cylinder abuts against the inner side wall of the fixed section.

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