Fixation device for intertrochanteric fractures of the femur
Patent Information
- Application Number
- CN202521139914.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-05
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-06-05
AI Technical Summary
Existing techniques for treating intertrochanteric fractures of the femur, especially in elderly patients with osteoporosis, suffer from problems such as unstable fixation of medial wall fractures, disruption of blood supply, and complex procedures, making it difficult to achieve a balance between biomechanical stability and soft tissue protection.
A fixation device was designed, comprising a proximal femoral anti-rotation intramedullary nail assembly, a small trochanter hook plate, and screw caps. The device achieves enhanced fixation of the medial wall through detachable connection, and simplifies operation and protects blood supply by utilizing the elongated holes and double hook assembly on the small trochanter hook plate.
It improves the fixation stability of intertrochanteric fractures of the femur, simplifies the procedure, and protects the patient's blood supply. It is suitable for osteoporotic fractures with comminuted medial wall fractures.
Smart Images
Figure CN224925218U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of medical apparatus and instruments especially relates to a fixing device for femoral intertrochanteric fracture. BACKGROUND
[0002] Femoral intertrochanteric fracture, also known as intertrochanteric fracture, is a common type of hip fracture in elderly patients with osteoporosis, which is often caused by low-energy injury such as falling. Early reduction and internal fixation is the preferred treatment. Since Evens proposed the concept of medial wall in 1945, the integrity of the medial wall (including the lower end of the femoral neck, the lesser trochanter, the cortex near the lesser trochanter, and the femoral calcar) has long been considered a key indicator of fracture stability. Biomechanical studies have shown that medial wall defects can significantly weaken the mechanical properties of the proximal femur, and anatomical reduction of the medial wall bone block can help restore structural stability.
[0003] However, with the development of minimally invasive techniques and internal fixation devices, intertrochanteric fractures with medial wall fractures (classified as unstable type in traditional classification) still face challenges in treatment: PFNA combined with cable lacing has the risk of bone block fixation failure and blood supply damage; PFNA combined with screw fixation has high requirements for reduction accuracy and screw direction; although the modified candy bag technique can enhance fixation, it is complex to operate and easy to damage blood supply. The above problems highlight the need to explore more optimal medial wall repair strategies while balancing biomechanical stability and soft tissue protection. SUMMARY
[0004] To solve the technical problems in the background art, the utility model provides a fixing device for femoral intertrochanteric fracture, which comprises a proximal femoral anti-rotation intramedullary nail assembly, a lesser trochanter hook plate and a screw cap; the proximal femoral anti-rotation intramedullary nail assembly is detachably connected with the lesser trochanter hook plate through the screw cap; The proximal femoral anti-rotation intramedullary nail assembly comprises an intramedullary nail rod and a tension screw; the intramedullary nail rod is detachably connected with the tension screw; the tension screw is provided with a first screw hole at one end close to the intramedullary nail rod, and the other end is a spiral drill bit; The proximal end of the lesser trochanter hook plate is provided with a long hole; the surface of the long hole is provided with a spiral blade; the long hole is sleeved on the outer surface of the tension screw through the spiral blade; the size of the screw cap matches the size of the first screw hole; the diameter of the head of the screw cap is greater than the width of the long hole; the lesser trochanter hook plate is detachably connected with the tension screw through the screw cap; the distal end of the lesser trochanter hook plate is provided with a double hook assembly; the double hook assembly comprises a first hook and a second hook; the first hook and the second hook are sequentially arranged along a preset direction; the preset direction is perpendicular to the arrangement direction of the lesser trochanter hook plate.
[0005] Further, the screw cap comprises the head and a rod part; the head is provided with a groove; the shape of the groove matches the shape of one end of the rod part close to the head; the rod part is fixedly connected with the head through the groove.
[0006] Further, the lesser trochanter hook plate is arched; the proximal end of the lesser trochanter hook plate is curved along one side close to the intramedullary nail rod; and the distal end of the lesser trochanter hook plate is curved along one side close to the intramedullary nail rod.
[0007] Further, the proximal end of the intramedullary nail rod is provided with a second screw hole obliquely arranged; the size of the lag screw matches the size of the second screw hole; and the lag screw is detachably connected with the intramedullary nail rod through the second screw hole.
[0008] Further, the length of the screw cap is 8.5mm±0.2mm; the one end of the rod part close to the head is hexagonal; and the width of opposite sides of the one end of the rod part close to the head is 6mm±0.5mm.
[0009] Further, the thickness of the head is 2.5mm±0.1mm; the head is circular; and the diameter of the head is 13mm±1mm.
[0010] Further, the length of the long strip hole is 10mm±2mm; and the width of the long strip hole is less than 10mm.
[0011] Further, the thickness of the lesser trochanter hook plate is 1.6mm±0.2mm; the width of the lesser trochanter hook plate is 10mm±2mm; and the length of the lesser trochanter hook plate is 50mm±3mm.
[0012] Further, the curvature radius of the proximal end of the lesser trochanter hook plate is 28mm±2mm; and the curvature radius of the distal end of the lesser trochanter hook plate is 10mm±1mm.
[0013] Further, the curvature radius of the first hook is 14mm±1mm; and the curvature radius of the second hook is 7mm±0.5mm.
[0014] The utility model discloses the beneficial effect is: The utility model discloses a fixing device for intertrochanteric fracture of femur, including the proximal end of femur anti -rotation intramedullary nail subassembly, small hook plate and screw cap, the proximal end of femur anti -rotation intramedullary nail subassembly with small hook plate passes through screw cap detachable connection, the proximal end of femur anti -rotation intramedullary nail subassembly includes intramedullary nail rod and tension screw, the intramedullary nail rod with tension screw is detachable connection, tension screw is close to the one end of intramedullary nail rod and is provided with first screw hole, and the other end is screw type drill bit, the proximal end of small hook plate is provided with long strip hole, the surface of long strip hole is provided with spiral blade, long strip hole is through spiral blade and is covered in the outer surface of tension screw, the size of screw cap is matched with the size of first screw hole, the diameter of the head of screw cap is greater than the width of long strip hole, small hook plate passes through screw cap and is detachable with tension screw, the distal end of small hook plate is provided with double hook subassembly, double hook subassembly includes first hook and second hook, first hook and second hook are sequentially arranged along the preset direction, the preset direction is the direction perpendicular to the setting direction of small hook plate. By setting small hook plate outside the proximal end of femur anti -rotation intramedullary nail subassembly, and the detachable connection of both through screw cap, help to strengthen the fixation of inner wall, and small hook plate is provided with long strip hole, long strip hole is covered outside tension screw through the spiral blade on the surface, and double hook subassembly is still provided on the small hook, so as to connect with small hook in actual use, the design of long strip hole and double hook subassembly simplifies the operation process, protects blood supply in actual use, and is suitable for osteoporosis and inner wall comminuted patient. BRIEF DESCRIPTION OF DRAWINGS
[0015] In order to more clearly illustrate the technical scheme of the utility model, below will to the embodiment or prior art description needed to use the drawing briefly introduce, obviously, the following description in the drawing is only some embodiments of the utility model, for those skilled in the art, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings.
[0016] Figure 1 It is a kind of schematic diagram for the fixing device for intertrochanteric fracture of femur provided by the utility model; Figure 2 It is a kind of schematic diagram of the proximal end of femur anti -rotation intramedullary nail subassembly provided by the utility model; Figure 3 It is the front schematic diagram of the fixing device for intertrochanteric fracture of femur provided by the utility model when using; Figure 4 It is the front transparent schematic diagram of the fixing device for intertrochanteric fracture of femur provided by the utility model when using; Figure 5It is a reverse surface schematic view of the fixing device for femoral intertrochanteric fracture in use provided by the utility model; Figure 6 It is a reverse surface schematic view of the fixing device for femoral intertrochanteric fracture in use provided by the utility model; Figure 7 It is a side surface schematic view of the fixing device for femoral intertrochanteric fracture in use provided by the utility model; Figure 8 It is a side surface schematic view of the fixing device for femoral intertrochanteric fracture in use provided by the utility model; Figure 9 It is a front surface schematic view of the lesser trochanter hook plate provided by the utility model; Figure 10 It is a schematic view of the lesser trochanter hook plate provided by the utility model; Figure 11 It is a schematic view of the double hook assembly provided by the utility model; Figure 12 It is a side surface schematic view of the screw cap provided by the utility model; Figure 13 It is a front surface schematic view of the screw cap provided by the utility model; In the figure, the reference signs correspond to: 1 - proximal femur anti-rotation intramedullary nail assembly, 2 - lesser trochanter hook plate, 3 - screw cap, 4 - intramedullary nail rod, 5 - tension screw, 6 - long slot, 7 - spiral blade, 8 - head, 9 - double hook assembly, 10 - first hook, 11 - second hook, 12 - rod. DETAILED DESCRIPTION
[0017] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.
[0018] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this utility model can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.
[0019] like Figures 1-13 As shown, this utility model provides a fixation device for intertrochanteric fractures of the femur, including a proximal femoral antirotation intramedullary nail assembly 1, a small trochanter hook plate 2, and a screw cap 3; the proximal femoral antirotation intramedullary nail assembly 1 and the small trochanter hook plate 2 are detachably connected by the screw cap 3. The aforementioned proximal femoral anti-rotation intramedullary nail assembly 1 includes an intramedullary nail rod 4 and a tension screw 5; the intramedullary nail rod 4 and the tension screw 5 are detachably connected; the tension screw 5 has a first screw hole at one end near the intramedullary nail rod 4 and a spiral drill bit at the other end; The proximal end of the aforementioned small rotor hook plate 2 is provided with an elongated hole 6; the surface of the elongated hole 6 is provided with a spiral blade 7; the elongated hole 6 is fitted onto the outer surface of the aforementioned tension screw 5 through the spiral blade 7; the size of the aforementioned screw cap 3 matches the size of the aforementioned first screw hole; the diameter of the head 8 of the aforementioned screw cap 3 is greater than the width of the aforementioned elongated hole 6; the aforementioned small rotor hook plate 2 is detachably connected to the aforementioned tension screw 5 through the aforementioned screw cap 3; the distal end of the aforementioned small rotor hook plate 2 is provided with a double hook assembly 9; the aforementioned double hook assembly 9 includes a first hook 10 and a second hook 11; the aforementioned first hook 10 and the aforementioned second hook 11 are arranged sequentially along a preset direction; the aforementioned preset direction is a direction perpendicular to the arrangement direction of the aforementioned small rotor hook plate 2.
[0020] In some embodiments, such as Figures 1-13As shown, the fixation device includes a proximal femoral antirotation intramedullary nail assembly 1, a lesser trochanteric hook plate 2, and a screw cap 3. The proximal femoral antirotation intramedullary nail assembly 1 and the lesser trochanteric hook plate 2 are detachably connected via the screw cap 3. The proximal femoral antirotation intramedullary nail assembly 1 can also be referred to as PFNA (Proximal Femoral Nail Antirotation). PFNA is an intramedullary fixation system specifically designed for treating proximal femoral fractures, such as intertrochanteric fractures. Figure 2 As shown, the proximal femoral anti-rotation intramedullary nail assembly 1 includes an intramedullary nail rod 4 and a lag screw 5, and the intramedullary nail rod 4 and the lag screw 5 are detachably connected. The intramedullary nail rod 4 can be a long shaft that is thinner at the distal end and thicker at the proximal end and has a certain degree of curvature. In actual use, the intramedullary nail rod 4 is inserted from the apex of the greater trochanter of the patient's femur into the femoral medullary cavity to provide axial stability. The proximal end of the intramedullary nail rod 4 is provided with a second threaded hole. The lag screw 5 is driven into the femoral head from the lateral side of the femur through the second threaded hole at the proximal end of the intramedullary nail rod 4. The lag screw 5 is provided with a first screw hole at one end near the intramedullary nail rod 4, and a spiral drill bit at the other end. The lag screw 5 engages with the femur through the threads on the spiral drill bit to achieve compression of the fracture ends. Fracture fixation is achieved through the synergistic action of the intramedullary nail rod 4 and the lag screw 5. The proximal end of the lesser trochanter hook plate 2 is provided with an elongated hole 6, and the surface of the elongated hole 6 is provided with a spiral blade 7. The elongated hole 6 is fitted onto the outer surface of the lag screw 5 through the spiral blade 7. The size of the screw cap 3 matches the size of the first screw hole. Specifically, the first screw hole can be circular. The screw cap 3 is divided into a head 8 and a shank 12. The shank 12 can be circular, and its outer diameter can be the same as the inner diameter of the first screw hole. Therefore, the screw cap 3 can be detachably connected to the tension screw 5 through the first screw hole. At the same time, the diameter of the head 8 of the screw cap 3 is larger than the width of the elongated hole 6. Therefore, the small rotor hook plate 2 can be detachably connected to the tension screw 5 through the screw cap 3. The far end of the small rotor hook plate 2 is provided with a double hook assembly 9, which includes a first hook 10 and a second hook 11. The first hook 10 and the second hook 11 are arranged sequentially along a preset direction, that is, a direction perpendicular to the setting direction of the small rotor hook plate 2. In actual use, the first hook 10 is fixed on the side of the small rotor closer to the large rotor, and the second hook 11 is fixed on the side of the small rotor away from the large rotor, thereby achieving the fixation of the inner wall and making the operation simple.
Claims
1. A fixation device for intertrochanteric fractures of the femur, characterized in that, It includes a proximal femoral antirotation intramedullary nail assembly (1), a small trochanter hook plate (2), and a screw cap (3); the proximal femoral antirotation intramedullary nail assembly (1) and the small trochanter hook plate (2) are detachably connected by the screw cap (3); The proximal femoral anti-rotation intramedullary nail assembly (1) includes an intramedullary nail rod (4) and a tension screw (5); the intramedullary nail rod (4) and the tension screw (5) are detachably connected; the tension screw (5) has a first screw hole at one end near the intramedullary nail rod (4) and a spiral drill bit at the other end; The small rotor hook plate (2) has a long hole (6) at its proximal end; a spiral blade (7) is provided on the surface of the long hole (6); the long hole (6) is fitted onto the outer surface of the tension screw (5) through the spiral blade (7); the size of the screw cap (3) matches the size of the first screw hole; the diameter of the head (8) of the screw cap (3) is greater than the width of the long hole (6); the small rotor hook plate (2) is detachably connected to the tension screw (5) through the screw cap (3); a double hook assembly (9) is provided at the distal end of the small rotor hook plate (2); the double hook assembly (9) includes a first hook (10) and a second hook (11); the first hook (10) and the second hook (11) are arranged sequentially along a preset direction; the preset direction is a direction perpendicular to the setting direction of the small rotor hook plate (2).
2. The fixation device for intertrochanteric fractures of the femur according to claim 1, characterized in that, The screw cap (3) includes a head (8) and a rod (12); a groove is provided on the head (8); the shape of the groove matches the shape of one end of the rod (12) near the head (8); the rod (12) is fixedly connected to the head (8) through the groove.
3. The fixation device for intertrochanteric fractures of the femur according to claim 1, characterized in that, The small rotor hook plate (2) is arched; the proximal end of the small rotor hook plate (2) is bent along the side close to the intramedullary nail rod (4); the distal end of the small rotor hook plate (2) is bent along the side close to the intramedullary nail rod (4).
4. The fixation device for intertrochanteric fractures of the femur according to claim 2, characterized in that, The proximal end of the intramedullary nail rod (4) is provided with an oblique second screw hole; the size of the tension screw (5) matches the size of the second screw hole; the tension screw (5) is detachably connected to the intramedullary nail rod (4) through the second screw hole.
5. The fixation device for intertrochanteric fractures of the femur according to claim 2, characterized in that, The length of the screw cap (3) is 8.5mm ± 0.2mm; the end of the rod (12) near the head (8) is hexagonal; the width of the opposite side of the end of the rod (12) near the head (8) is 6mm ± 0.5mm.
6. The fixation device for intertrochanteric fractures of the femur according to claim 5, characterized in that, The thickness of the head (8) is 2.5mm ± 0.1mm; the head (8) is circular; the diameter of the head (8) is 13mm ± 1mm.
7. The fixation device for intertrochanteric fractures of the femur according to claim 1, characterized in that, The length of the elongated hole (6) is 10mm ± 2mm; the width of the elongated hole (6) is less than 10mm.
8. The fixation device for intertrochanteric fractures of the femur according to claim 1, characterized in that, The thickness of the small rotor hook plate (2) is 1.6mm ± 0.2mm; the width of the small rotor hook plate (2) is 10mm ± 2mm; and the length of the small rotor hook plate (2) is 50mm ± 3mm.
9. The fixation device for intertrochanteric fractures of the femur according to claim 1, characterized in that, The radius of curvature of the proximal end of the small rotor hook plate (2) is 28mm ± 2mm; the radius of curvature of the distal end of the small rotor hook plate (2) is 10mm ± 1mm.
10. The fixation device for intertrochanteric fractures of the femur according to claim 1, characterized in that, The radius of curvature of the first hook (10) is 14mm ± 1mm; the radius of curvature of the second hook (11) is 7mm ± 0.5mm.