Femoral trochanteric fracture fixation device

Abstract

The present invention discloses a fixation device for femoral trochanteric fracture, including an intramedullary nail, a plurality of blades and a core rod. The proximal end of the intramedullary nail is provided with a rod through hole, and a positioning groove is provided around the edge of the rod through hole. The blade includes a convex blade portion of a blade head located at the head end of the outer edge, and the convex blade portion of the blade head is matched and clamped in the inner wall of the convex ridge portion of the inner cavity of the femoral neck along the radial direction. The blade tail at the rear end of the blade is matched and clamped in the corresponding positioning groove around the rod through hole. The core rod passes through and is sleeved in the rod through hole, and the inner end is used to support the back of each blade, and the outer end of the core rod is fixed to the intramedullary nail or the femur. The outer side of the core rod is provided with knife grooves along the axial direction, and each knife groove is used to match the back of the corresponding blade. The present invention uses the intramedullary nail to fix with the rear ends of the plurality of blades, and uses the plurality of blades and the core shaft to support the inner wall of the convex ridge portion of the inner cavity of the femoral neck, thereby forming a firm support and constraint relationship.

Description

Technical Field

[0001] The invention belongs to the technical field of femoral neck fracture reduction and fixation instruments, and in particular relates to a femoral neck fracture fixation device. Background Art

[0002] Femoral neck and intertrochanteric fractures are common and frequently occurring diseases in the elderly. When femoral neck fractures or intertrochanteric fractures are fixed with screws and nail plate systems, there are many traditional internal fixation methods for femoral neck fractures. Due to the difficulty in operation and many complications, joint replacement is often required in the end. The femoral neck has a special anatomical structure, with neck-shaft angles and anteversion angles on different planes, and its position is deep and hidden, making it difficult to correctly insert the positioning guide pin. In the clinical internal fixation treatment of femoral neck and intertrochanteric fractures, guide pins must be inserted for positioning first. Usually, guide pins are inserted based on the doctor's clinical experience. The main factor of the traditional fixation method is the problem of loose fixation.

[0003] On the other hand, the femoral neck consists of an outer hard bone part and an inner loose bone part, e.g. Fig.15 As shown in the figure, the loose bone part fills the entire bone cavity. The inner loose bone part is large in volume but low in density. The intramedullary nail fixed in the outer hard bone part has a fixed strength, but the fixed strength in the inner loose bone part is insufficient. In fact, most of the intramedullary nails are in the inner loose bone part. The outer diameter of the root and end of the femoral neck is larger than its neck, and there is a situation where part of the intramedullary nail is exposed outside the neck, which leads to the problem of poor firmness of intramedullary nail fixation.

[0004] In the prior art, there is a structure similar to an expansion wire, which supports the inner wall of the bone cavity by expanding the expansion part in the femoral neck bone cavity. In fact, it supports the loose bone part and compresses the loose bone part to the hard bone inner wall. This expansion-type bone compression device has the following problems: (1) The expansion surface is an arc surface, which cannot completely peel off the loose bone part and directly contact the hard bone inner wall, resulting in insufficient firmness after compression; (2) After expansion and compression, it cannot provide sufficient circumferential restraint force on the femoral neck, and the femoral neck may rotate. Dislocation occurs, (3) it is highly destructive to the loose bone part. When its inner end expands, it destroys all the loose bone parts in the femoral neck cavity. (4) its inner end expansion part cannot completely match the inner wall of the femoral neck cavity and cannot provide sufficient anti-torsion force. Patients with femoral neck fractures need to maintain the lower limb internal rotation position for fracture reduction. This point is embedded in the acetabulum and is not a complete sphere. Body rotation will bring a large torque to the internal support component, resulting in point contact between the inner end expansion part and the inner wall of the femoral neck, resulting in poor internal pressure firmness. For example, the "expansion fixation femoral head internal support body" provided by CN 202146350 U includes a support body and an internal expansion screw. The support body is sleeved outside the internal expansion screw. The top of the support body is arc-shaped. The support body is provided with radial expansion wings. The expansion wings are composed of a number of wing pieces. An expansion gap is formed between the wing pieces. The internal expansion screw is provided with an expansion section. After the internal expansion screw is inserted into the support body, the expansion section can open the expansion wing. The support body and the internal expansion screw are threadedly connected. This patent document has the above problems (1)-(4), and the "Adjustable pressure-fixed expansion bolt for femoral neck fracture" with publication number CN2299593Y has the above problems (1)-(4). The "femoral neck expandable locking pressure screw" with publication number CN2487349Y and the "expansion pressure bone plug" with publication number CN2209507Y have the above problems (2) and (4). Summary of the invention

[0005] In view of the defects and problems existing in various existing femoral neck fixation methods, the present invention provides a femoral neck fracture fixation device which can effectively fix the femoral neck fracture site from the inside and can provide sufficient anti-twisting force to prevent secondary injury in the fixed state by inserting a radial blade with a matching contour into the femoral neck bone cavity and using a core rod to press the blade and position the blade.

[0006] The solution adopted by the present invention to solve the technical problem is: a femoral trochanter fracture fixation device, including an intramedullary nail, and also including a plurality of blades and a core rod, the proximal end of the intramedullary nail is provided with a rod through hole, and the peripheral edge of the rod through hole has a positioning groove, the blade includes a convex blade portion of a blade head located at the head end of the outer edge, the convex blade portion of the blade head is matched and clamped on the inner wall of the convex ridge portion of the inner cavity of the femoral neck along the radial direction, and the blade tail at the rear end of the blade is matched and clamped in the corresponding positioning groove around the rod through hole, the core rod passes through and is set in the rod through hole, and the inner end is used to support the back of each blade, and the outer end of the core rod is fixed to the intramedullary nail or the femur. The outer side of the core rod is provided with knife grooves distributed along the axial direction, and each knife groove is used to match the back of the corresponding blade.

[0007] A femoral trochanteric fracture fixation device includes an intramedullary nail, a plurality of blades and a core rod. A rod through-hole is arranged at the proximal end of the intramedullary nail. The blade includes a convex blade portion of a cutter head located at the head end of an outer edge. The convex blade portion of the cutter head is radially matched and clamped on the inner wall of the convex ridge portion of the inner cavity of the femoral neck. The tail of the blade at the rear end of the blade is matched and clamped in the rod through-hole. The outer side of the core rod is provided with blade grooves along the axial direction. The core rod passes through and is fitted in the rod through-hole. The inner end blade groove is used to match the blade back of the corresponding blade. The outer end of the core rod is fixed to the intramedullary nail or the femur.

[0008] A fixation device for femoral trochanteric fractures includes a steel plate matching the contour of the femoral trochanteric region, a plurality of blades and a core rod, the steel plate includes a rod through hole, and the peripheral edge of the rod through hole has a positioning groove, the blade includes a convex blade portion of a blade head located at the head end of the outer edge, the convex blade portion of the blade head is matched and clamped on the inner wall of the convex ridge portion of the inner cavity of the femoral neck along the radial direction, the blade tail at the rear end of the blade is matched and clamped in the corresponding positioning groove around the rod through hole, the core rod passes through and is set in the rod through hole, and the inner end is used to support the back of each blade, and the outer end of the core rod is fixed to the intramedullary nail or the femur. The outer side of the core rod is axially distributed with knife grooves, and each knife groove is used to match the back of the corresponding blade.

[0009] A femoral trochanteric fracture fixation device includes a steel plate that matches the contour of the femoral trochanteric region, and also includes multiple blades and a core rod. The steel plate includes a rod through hole, and the blade includes a convex blade portion of a cutter head located at the head end of the outer edge. The convex blade portion of the cutter head is radially matched and clamped on the inner wall of the convex ridge portion of the femoral neck inner cavity, and the blade tail at the rear end of the blade is matched and clamped in the rod through hole. The outer side of the core rod is axially distributed with blade grooves, the core rod passes through and is sleeved in the rod through hole, and the inner end blade groove is used to match the blade back of the corresponding blade, and the outer end of the core rod is fixed to the intramedullary nail or the femur.

[0010] The core rod is a cylindrical core rod, or a plate-type core rod a, or an elliptical core rod b, or a plate-type structure.

[0011] The convex edge portion of the blade head is in a continuous tooth shape.

[0012] A baffle is arranged at the outer end of the inner core rod and a fixing through hole is arranged on the baffle. Meanwhile, a fixing screw hole is arranged around the rod through hole of the intramedullary nail. The baffle is fixed to the outer side of the corresponding rod through hole by screws.

[0013] The baffle is fixed to the core rod as a whole, or assembled and installed with the core rod as a whole.

[0014] Beneficial effects: The present invention utilizes an intramedullary nail to fix the tail ends of multiple blades, and utilizes multiple blades and a core shaft to support the inner wall of the convex ridge portion of the inner cavity of the femoral neck, thereby forming a firm supporting and restraining relationship.

[0015] The present invention first enters the bone cavity with the blade fitting the inner wall of the femoral neck, and the destructiveness of the loose bone part in the bone cavity is minimized. Selecting a suitable blade can completely match the enlarged part of the inner end of the femoral neck, so that the edge contour of each blade completely fits the inner wall of the enlarged part of the bone cavity. After the back of each blade is supported by the core rod, each blade is supported radially on the inner wall of the femoral neck bone cavity. This support and fixation method has the following advantages: (1) The blade enters the bone cavity with little destructiveness to the loose bone part in the femoral neck bone cavity, and retains the main part of the loose bone (mainly retaining the part of the loose bone in contact with the hard bone), (2) The edge contour of each blade completely fits the inner wall of the enlarged part of the bone cavity, overcoming the disadvantages of the existing expansion bolt point compression, and can firmly compress and evenly stress, (3) It can effectively provide sufficient circumferential restraint force on the femoral neck to prevent the femoral neck from being dislocated due to rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is one of the application status schematic diagrams of the present invention.

[0017] Figure 2 yes Figure 1 Schematic diagram of the appearance structure of the device.

[0018] Figure 3 yes Figure 2 A three-dimensional view of the central cylindrical core rod.

[0019] Figure 4 yes Figure 1 Stereoscopic view of the middle blade.

[0020] Figure 5 yes Figure 4 Schematic diagram of the structure of each side

[0021] Figure 6 yes Figure 5 Schematic diagram of the AA section structure.

[0022] Figure 7 It is a schematic diagram of the structure of a blade including locking teeth.

[0023] Figure 8 This is the second schematic diagram of the application state of the present invention.

[0024] Fig. 9 yes Figure 8 Schematic diagram of the assembly of the device.

[0025] Fig.10 is with Figure 8 Schematic diagram of the intramedullary nail structure used in conjunction with the device.

[0026] Fig.11 yes Fig.10 Schematic diagram of the structure in the middle B direction.

[0027] Fig.12 It is a schematic diagram of the oblate (elliptical) core rod structure.

[0028] Fig.13 This is the third schematic diagram of the application state of the present invention.

[0029] Fig.14 yes Fig.13 Schematic diagram of the combined structure of the core rod and the rear baffle.

[0030] Fig.15 This is a schematic diagram of a hole type for an intramedullary nail.

[0031] Fig.16 is with Fig.15 Schematic diagram of the knife tail structure installed with hole type matching.

[0032] Fig.17 This is the fourth schematic diagram of the application state of the present invention.

[0033] Fig.18 This is the fifth schematic diagram of the application state of the present invention.

[0034] Fig.19 is with Fig.18 Schematic diagram of the installed intramedullary nail.

[0035] Fig. 20 is with Fig.18 Schematic diagram of the plate core rod to be installed.

[0036] Numbers in the figure: intramedullary nail 1, rod through hole 11, positioning groove 12, fixing screw hole 13, plane slot 14, flat hole 15, inner slot 16, baffle 17, blade 2, knife tail 21, knife head convex edge portion 22, knife back 23, latch teeth 24, clamping platform 25, cylindrical core rod 3, plate core rod 3a, elliptical core rod 3b, knife groove 31, plug 32, radial fixing hole 33, arc rear baffle 4, plane rear baffle 4a, fixing through hole 41, plug hole 42, steel plate 5. DETAILED DESCRIPTION

[0037] Embodiment 1: a kind of Figure 2The fixation device shown is mainly used for femoral neck trochanteric fractures. Its usage status is shown in Figure 1 As can be seen from the figure, the device mainly includes an intramedullary nail, a plurality of blades and a core rod.

[0038] The intramedullary nail 1 is a special intramedullary nail, which requires a rod through hole 11 matching the core rod shape to be provided at its proximal end. Moreover, a positioning groove 12 is also required to be provided around the edge of the rod through hole 11.

[0039] like Figure 4 and Figure 5 Each blade 2 includes a blade portion on one side and a blade back on the other side, and a blade head convex blade portion 22 protruding outward is provided at the head end of the blade portion side. When the device is used, each blade needs to be passed through each rod through hole one by one and inserted into the inner cavity of the femoral neck respectively, so that the blade head convex blade portion 22 is radially matched and clamped on the inner wall of the convex ridge portion of the inner cavity of the femoral neck.

[0040] The blade tail 21 at the rear end of the blade 2 is matched and clamped in the corresponding positioning groove 12 around the rod through hole 11, so that each blade 2 can be positioned respectively by using each positioning groove 12 to prevent possible flipping and falling off.

[0041] Then, the core rod is passed through and inserted into the rod through hole 11, and the inner end of the core rod is used to support the blade back 23 of each blade 2, and the outer end of the core rod is fixed to the intramedullary nail or the femur.

[0042] from Figure 3 It can be seen that the present embodiment uses a cylindrical core rod 3, and knife grooves 31 are symmetrically distributed on both sides of the cylindrical core rod 3. The knife grooves on both sides are used to match the knife backs 23 of the corresponding blades 2. It can also be seen in the figure that knife grooves can be set around the core rod. Therefore, each blade is constrained by the positioning groove 12 in the rod through hole and the knife groove 31 on the edge of the cylindrical core rod 3, and is also supported radially by the knife groove of the cylindrical core rod 3. After the cylindrical core rod 3 is installed, each blade 2 can be fixed in the rod through hole 11 of the intramedullary nail 1, ensuring that each blade 2 is stable.

[0043] The core rod is fixed in this embodiment by fixing an arc-shaped baffle 4 on the outer end of the core rod, and the arc-shaped baffle 4 can be matched and fitted in the outer side surface or outer arc-shaped groove of the intramedullary nail. Further, a fixing through hole 41 is provided on the baffle, and a fixing screw hole 13 is provided around the edge of the rod through hole 11 of the intramedullary nail, and the baffle is fixed to the outer side of the corresponding rod through hole by screws.

[0044] The inner end of the intramedullary nail can also be fixed by a corresponding fixing nail to ensure the stability of the intramedullary nail.

[0045] After the femoral neck trochanteric fracture, the nailing surface is broken, resulting in the problem of loose nailing. Therefore, the femoral neck trochanteric fracture is difficult to fix by the traditional method of inserting nails into the femoral neck. This embodiment is mainly used for the fixation of femoral neck trochanteric fractures. The intramedullary nail and the blade are firmly connected to make the femoral neck trochanteric fracture site have an inward fixation effect. At the same time, this embodiment of the device can also be used for femoral shaft fractures and femoral neck fractures.

[0046] Embodiment 2: A second femoral trochanteric fracture fixation device. Based on Embodiment 1, this embodiment is provided with a rod through hole 11 at the proximal end of the intramedullary nail 1, and a positioning groove 12 is provided around the edge of the rod through hole 11. The blade 2 includes a blade head convex blade portion 22 located at the head end of the outer edge, and the blade head convex blade portion 22 is radially matched and clamped on the inner wall of the convex ridge portion of the inner cavity of the femoral neck. The blade tail 21 at the rear end of the blade 2 is matched and clamped in the corresponding positioning groove 12 around the rod through hole 11, but the core shaft is cylindrical or elliptical, the core rod passes through and is inserted into the rod through hole 11, and the inner end surface is used to directly support the blade back 23 of each blade 2, and the outer end of the core rod is fixed to the intramedullary nail or femur.

[0047] Embodiment 3: A third femoral trochanteric fracture fixation device is provided on the basis of Embodiment 1, wherein a rod through-hole 11 is provided at the proximal end of the intramedullary nail 1, and the blade 2 includes a blade head convex blade portion 22 located at the head end of the outer edge, and the blade head convex blade portion 22 is radially matched and clamped on the inner wall of the convex ridge portion of the inner cavity of the femoral neck, and the blade tail 21 at the rear end of the blade 2 is matched and clamped in the rod through-hole 11, and a blade groove 31 is distributed axially on the outer side of the core rod, and the core rod passes through and is inserted into the rod through-hole 11, and the inner end blade groove is used to match the blade back 23 of the corresponding blade 2, and the outer end of the core rod is fixed to the intramedullary nail or the femur.

[0048] Embodiment 4: A fourth femoral trochanteric fracture fixation device is based on Embodiment 3, wherein the core rod is changed into a plate shape, such as Fig. 20 The plate-type core rod 3a shown in the figure has a rod through-hole 15 arranged at the proximal end of the intramedullary nail. Fig.19 The device is assembled in the following state: Fig.18 As shown, the knife tail 21 can also be inserted into the flat hole 15 and supported on the hole wall by the plate-type core rod 3a. Due to the use of the plate-type core rod 3a and the slope 15 for installation, it is no longer necessary to use a core rod tail baffle, but to directly set a perforation at the outer end of the plate body, and at the same time, a mounting hole is opened at the rod perforation position of the intramedullary nail along a direction perpendicular to the rod perforation, and the core shaft perforation and the intramedullary nail mounting hole are fixed together by screws.

[0049] Embodiment 5: A fifth femoral trochanteric fracture fixation device is based on Embodiment 1, wherein a groove is milled at the outer end of the rod perforation of the intramedullary nail, such as Fig. 9 and Fig.10The planar slot 14 in the center, the planar rear baffle 4a fixed at the outer end of the core rod can be matched and mounted in the planar slot 14, and the planar rear baffle 4a can support the tails 21 of multiple blades to prevent them from coming out. The planar rear baffle 4a is also fixed to the intramedullary nail to prevent the core rod from coming out. Fig.10 It is also shown that a stopper is arranged at the end position of the corresponding positioning groove 12 around the rod through hole 11, and the stopper 17 can be used to support the knife tail.

[0050] Embodiment 6: The sixth femoral trochanteric fracture fixation device is based on Embodiment 1, but the outer end of the mandrel is not provided with a baffle, but a through hole is provided radially at the outer end of the mandrel, and a mounting hole is provided perpendicular to the rod through hole at the position of the intramedullary nail rod through hole, and the mandrel through hole and the intramedullary nail mounting hole are fixed together by screws. To prevent the blade from sliding in the axial direction, a thinner section such as Figure 4 As shown, the blade tail becomes thinner and there is a step between the blade tail and the blade body. The blade tail can be clamped in the positioning groove 12 of the rod penetration hole, and the step is supported on the inner wall of the intramedullary nail.

[0051] Embodiment 7: A seventh femoral trochanteric fracture fixation device is based on Embodiment 1, wherein the rod through hole 11 at the proximal end of the intramedullary nail is oblate or elliptical, and the core rod is a matching oblate or elliptical shape, such as Fig.12 shown.

[0052] Embodiment 8: An eighth femoral trochanteric fracture fixation device is based on Embodiment 1, and replaces Figure 7 The blade shown includes a continuously toothed (serrated) blade head convex edge portion 22.

[0053] Embodiment 9: A ninth femoral trochanteric fracture fixation device, based on Embodiment 1, Fig.13 and Fig.14 As shown, the relationship between the core rod 3 and the curved rear baffle 4 or the flat rear baffle 4a is designed to be a plug-in relationship of active connection.

[0054] Embodiment 10: A tenth femoral trochanteric fracture fixation device, based on Embodiment 1, is provided with an inwardly recessed inner groove 16 in the positioning groove 12 of the rod penetration hole, such as Fig.15 As shown, a clamping platform 25 protruding outward is provided on the side of the blade tail 21 of the blade 2. When the blade tail is installed in the positioning groove, the clamping platform is sleeved with the clamping groove.

[0055] Embodiment 11: An eleventh femoral trochanteric fracture fixation device, based on Embodiment 1, comprises a steel plate 5 matching the contour of the femoral trochanteric region, such as Fig.17As shown. It also includes multiple blades and a core rod, the steel plate 5 includes a rod through hole 11, and the edge of the rod through hole 11 has a positioning groove 12, the blade 2 includes a blade head convex blade portion 22 located at the head end of the outer side, the blade head convex blade portion 22 is radially matched and clamped on the inner wall of the convex ridge portion of the femoral neck cavity, the blade tail 21 at the tail end of the blade 2 is matched and clamped in the corresponding positioning groove 12 around the rod through hole 11, the core rod passes through and is set in the rod through hole 11, and the inner end is used to support the blade back 23 of each blade 2, and the outer end of the core rod is fixed to the intramedullary nail or femur. In this embodiment, the outer side of the core rod is distributed with knife grooves 31 along the axial direction, and each knife groove is used to match the knife back 23 of the corresponding blade 2.

[0056] Embodiment 12: The twelfth femoral trochanteric fracture fixation device, based on Embodiment 11, includes a steel plate 5 matching the contour of the femoral trochanteric region, and also includes a plurality of blades and a core rod, the steel plate 5 includes a rod through hole 11, the blade 2 includes a blade head convex blade portion 22 located at the head end of the outer edge, the blade head convex blade portion 22 is radially matched and clamped on the inner wall of the convex ridge portion of the femoral neck cavity, the blade tail 21 at the rear end of the blade 2 is matched and clamped in the rod through hole 11, and the outer side of the core rod is axially distributed with blade grooves 31, the core rod passes through and is mounted in the rod through hole 11, and the inner end blade groove is used to match the blade back 23 of the corresponding blade 2, and the outer end of the core rod is fixed to the intramedullary nail or femur.

[0057] Embodiment 13: A thirteenth femoral trochanteric fracture fixation device, based on Embodiment 1 or 11, has a through hole or screw hole 6 radially opened on the side of the core rod, such as Fig.17 and Fig. 20 As shown, after the core rod is passed through the femoral neck cavity and the intramedullary nail or steel plate rod perforation, a locking wire is inserted into the perforation or screw hole 6 to fix the core rod to the side of the intramedullary nail or the femoral neck bone, thereby further constraining and fixing the core rod.

Claims

1. A fixation device for femoral trochanteric fracture, comprising an intramedullary nail, characterized in that: The invention also comprises a plurality of blades and a core rod. The proximal end of the intramedullary nail (1) is provided with a rod through hole (11), and the peripheral edge of the rod through hole (11) is provided with a positioning groove (12). The blade (2) comprises a blade head convex blade portion (22) located at the head end of the outer side edge. The blade head convex blade portion (22) is radially matched and clamped on the inner wall of the convex ridge portion of the inner cavity of the femoral neck. The blade tail (21) at the rear end of the blade (2) is matched and clamped in the corresponding positioning groove (12) around the rod through hole (11). The core rod passes through and is inserted into the rod through hole (11), and the inner end is used to support the blade back (23) of each blade (2). The outer end of the core rod is fixed to the intramedullary nail or the femur. The core rod is a cylindrical core rod (3), or a plate core rod (3a), or an elliptical core rod (3b). The blade head convex blade portion (22) of the blade (2) is in the shape of continuous clamping teeth.

2. The femoral trochanteric fracture fixation device according to claim 1, characterized in that: The outer side of the core rod is provided with knife grooves (31) distributed along the axial direction, and each knife groove is used to match the knife back (23) of the corresponding blade (2).

3. A fixation device for femoral trochanteric fracture, comprising an intramedullary nail, characterized in that: The invention also comprises a plurality of blades and a core rod. The proximal end of the intramedullary nail (1) is provided with a rod through hole (11). The blade (2) comprises a blade head convex blade portion (22) located at the head end of the outer side edge. The blade head convex blade portion (22) is radially matched and clamped on the inner wall of the convex ridge portion of the inner cavity of the femoral neck. The blade tail (21) at the tail end of the blade (2) is matched and clamped in the rod through hole (11). The outer side of the core rod is provided with blade grooves (31) along the axial direction. The core rod passes through and is sleeved in the rod through hole (11). The inner end blade groove is used to match the blade back (23) of the corresponding blade (2). The outer end of the core rod is fixed to the intramedullary nail or the femur. The core rod is a cylindrical core rod (3), or a plate core rod (3a), or an elliptical core rod (3b). The blade head convex blade portion (22) of the blade (2) is in the shape of continuous clamping teeth.

4. A fixation device for femoral trochanteric fractures, comprising a steel plate (5) matching the contour of the femoral trochanteric region, characterized in that: It also includes a plurality of blades and a core rod. The steel plate (5) includes a rod through hole (11), and the peripheral edge of the rod through hole (11) has a positioning groove (12). The blade (2) includes a blade head convex blade portion (22) located at the head end of the outer side. The blade head convex blade portion (22) is radially matched and clamped on the inner wall of the convex ridge portion of the femoral neck inner cavity. The blade tail (21) at the rear end of the blade (2) is matched and clamped in the corresponding positioning groove (12) around the rod through hole (11). The core rod passes through and is inserted into the rod through hole (11), and the inner end is used to support the blade back (23) of each blade (2). The outer end of the core rod is fixed to the intramedullary nail or the femur. The core rod is a cylindrical core rod (3), or a plate core rod (3a), or an elliptical core rod (3b). The blade head convex blade portion (22) of the blade (2) is in the shape of continuous clamping teeth.

5. The femoral trochanteric fracture fixation device according to claim 4, characterized in that: The outer side of the core rod is provided with knife grooves (31) distributed along the axial direction, and each knife groove is used to match the knife back (23) of the corresponding blade (2).

6. A fixation device for femoral trochanteric fractures, comprising a steel plate (5) matching the contour of the femoral trochanteric region, characterized in that: It also includes a plurality of blades and a core rod. The steel plate (5) includes a rod through hole (11). The blade (2) includes a blade head convex blade portion (22) located at the head end of the outer side. The blade head convex blade portion (22) is radially matched and clamped on the inner wall of the convex ridge portion of the inner cavity of the femoral neck. The blade tail (21) at the tail end of the blade (2) is matched and clamped in the rod through hole (11). The outer side of the core rod is provided with blade grooves (31) along the axial direction. The core rod passes through and is sleeved in the rod through hole (11), and the inner end blade groove is used to match the blade back (23) of the corresponding blade (2). The outer end of the core rod is fixed to the intramedullary nail or the femur. The core rod is a cylindrical core rod (3), or a plate core rod (3a), or an elliptical core rod (3b). The blade head convex blade portion (22) of the blade (2) is in the shape of continuous clamping teeth.

7. The femoral trochanteric fracture fixation device according to any one of claims 1 to 6, characterized in that: A baffle is provided at the outer end of the inner core rod and a fixing through hole (41) is arranged on the baffle. Meanwhile, a fixing screw hole (13) is arranged around the rod through hole (11) of the intramedullary nail. The baffle is fixed to the outer side of the corresponding rod through hole by screws.

8. The femoral trochanteric fracture fixation device according to claim 7, characterized in that: The baffle is fixed to the core rod as a whole, or assembled and installed with the core rod as a whole.

Images