Customized joint for advanced femoral intertrochanteric fracture

Abstract

The utility model relates to the technical field of medical instruments, and discloses an elderly femoral intertrochanteric fracture customized joint which comprises a bone near end, a fixing hole is formed in the surface of the bone near end, and a fixing ring, a positioning plate, a stress belt and a positioning hole are arranged in the fixing hole. The femoral prosthesis is reasonable in structure, the 3D printing femoral prosthesis, the fixing ring and the bolt ring at the proximal femur can be replaced in various models and sizes according to parameters of a patient, the proximal femur can be customized for the thickness and strength prosthesis of a bone trabecula according to the weight of the patient, and the distal and proximal femur can be positioned through the butt joint ring arranged on the lower surface of the proximal femur. The phenomenon that the distal femur fixed by a thread structure is loosened due to movement of a patient is avoided, effective bony support can be provided for a proximal femur fracture block through the design of the proximal femur individualized 3D printing bone trabecula, bony mechanical stability is achieved in the early stage, bone ingrowth is facilitated in the long term, proximal femur biological fixation is achieved, bony structure support is facilitated, and bone fracture is prevented. The gluteus medius efficiency and the ideal force arm are recovered.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a customized joint for intertrochanteric fractures of the femur in the elderly. Background Art

[0002] As a method of treating hip joint diseases, total hip replacement has been widely recognized by orthopedic surgeons after nearly a decade of development. With the increasing number of total hip replacement surgeries, artificial joint replacement has been greatly improved and enhanced from surgical technology to prosthesis design, and the requirements for hip prosthesis installation are also getting higher and higher. It provides another individualized solution and clinical thinking model for elderly / very elderly patients with intertrochanteric fractures, and provides a new medical approach to the social problems that need to be solved urgently due to the aging population.

[0003] An artificial femur for hip replacement that is easy to calibrate position is disclosed in the Chinese utility model patent application disclosure CN216394386U. Although the angle between the positioning groove passing through the center of the femoral head and the force line of the human femur is adjusted to keep the center of the femoral head parallel to the center of the greater trochanter of the femur, and the positioning groove and the force line of the human femur are kept perpendicular, the femoral stem can be fixed by passing a Kirschner wire through the positioning groove to quickly adjust the position of the artificial joint and improve the efficiency of the operation, it is unable to achieve early bone mechanical stability, facilitate bone ingrowth in the long term, and achieve proximal femoral biological fixation. At the same time, the existing large size deviation is usually achieved by using fixing bolts or Kirschner wires for positioning and fixing, which is very prone to dislocation and detachment. Therefore, we propose a new device to solve the above problems. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the utility model provides a customized joint for intertrochanteric fractures of the femur in the elderly, which solves the problems of being unable to achieve bone mechanical stability, long-term bone ingrowth, and easy loosening and deviation of the distal femur and the proximal femur.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the utility model is implemented through the following technical solutions: a customized joint for intertrochanteric fractures of the femur in the elderly, comprising a proximal femur, a fixing hole is provided on the surface of the proximal femur, a fixing ring is provided inside the fixing hole, a positioning plate is provided on the upper surface of the proximal femur, a stress belt is covered on the surface of the proximal femur, a positioning hole is provided on the surface of the proximal femur, a bolt ring is provided inside the positioning hole, a threaded hole is provided on the lower surface of the proximal femur, a docking bolt is penetrated through the internal thread of the threaded hole, a docking ring is threadedly penetrated through the proximal femur by the docking bolt, a rotating shaft is inserted inside the docking ring, a clamping plate is rotatably connected to the surface of the rotating shaft, an external femoral support structure is provided inside the proximal femur, an internal femoral support structure is provided inside the external femoral support structure, a femoral head is sleeved on the surface of the internal femoral support structure, an extension bolt is penetrated through the internal thread of the proximal femur, and the extension bolt is threadedly penetrated through the docking plate and the distal end of the femur from top to bottom.

[0008] Optionally, a reinforcement ring is provided on the surface of the positioning plate, and the reinforcement ring is adapted to the femoral external support structure.

[0009] Optionally, the interior of the proximal femur is honeycomb-shaped, the stress band is located in the middle of the proximal femur, and the material of the stress band is flexible.

[0010] Optionally, a plurality of fixing holes are provided on the surface of the proximal end of the femur, and fixing rings of different types can be replaced inside the fixing holes.

[0011] Optionally, a plurality of positioning holes are formed on the surface of the proximal end of the femur, and bolt rings of different types can be replaced inside the positioning holes.

[0012] Optionally, the femoral external support structure and the distal end of the femur are made of a smooth bone cement handle.

[0013] Optionally, the fixing hole provided on the surface of the proximal femur is located at the greater trochanter of the proximal trabeculae, and the positioning hole opened on the surface of the proximal femur is located at the lesser trochanter of the trabeculae.

[0014] In summary, the technical effects and advantages of the utility model are:

[0015] 1. The utility model has a reasonable structure. Through the 3D printed femoral prosthesis of the proximal femur, the fixing ring and the bolt ring can be replaced with various models and sizes according to the patient parameters. The femoral prosthesis with different deflection distances and neck lengths can meet the biomechanical reconstruction needs of the proximal femur with different types of fractures. The thickness and strength of the trabeculae of the proximal femur can be customized according to the patient's weight. The docking ring provided on the lower surface of the proximal femur can position the proximal distal femur to avoid the loosening of the distal femur fixed by the threaded structure due to the movement of the patient. The individualized 3D printed trabeculae design of the proximal femur can provide effective bone support for the proximal femoral fracture fragment, achieve bone mechanical stability in the early stage, facilitate bone ingrowth in the long term, realize biological fixation of the proximal femur, facilitate bone structure support, maintain the tension of soft tissue (gluteus medius and vastus lateralis), and restore the effectiveness of the gluteus medius and the ideal lever arm.

[0016] 2. In the utility model, the femoral head can be customized so that the external femoral support structure can be docked with the native femoral head. The reinforcing ring inside the device is used to enhance the stress of the internal femoral support structure to avoid deformation. The bolt extension is also used to increase the supporting force inside the distal femur to avoid the femoral deformation in the later stage, which shortens the life of the prosthesis. The internal femoral support structure is made of 3D printed material, which can increase the internal stress and reduce deformation. At the same time, it can make the smooth bone cement of the external femoral support structure better in plasticity, and the distal femur is lengthened with bone cement for fixation, which has better longitudinal and rotational stability, and achieves early immediate stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the proximal femur explosion structure of the utility model;

[0019] Figure 3 This is a schematic diagram of the explosion structure of the docking ring of the utility model;

[0020] Figure 4 It is a schematic diagram of the distal femur explosion structure of the utility model.

[0021] In the figure: 1, proximal femur; 2, fixing hole; 3, fixing ring; 4, positioning plate; 5, stress belt; 6, positioning hole; 7, bolt ring; 8, docking bolt; 9, docking ring; 10, rotating shaft; 11, clamping plate; 12, external femoral support structure; 13, internal femoral support structure; 14, femoral head; 15, extension bolt; 16, docking plate; 17, distal femur; 18, reinforcement ring. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Example: Reference Figure 1-Figure 4 The customized joint for intertrochanteric fracture of the femur in the elderly shown includes a proximal femur 1, a fixing hole 2 is provided on the surface of the proximal femur 1, a fixing ring 3 is provided inside the fixing hole 2, a positioning plate 4 is provided on the upper surface of the proximal femur 1, a stress belt 5 is covered on the surface of the proximal femur 1, a positioning hole 6 is provided on the surface of the proximal femur 1, a bolt ring 7 is provided inside the positioning hole 6, a threaded hole is provided on the lower surface of the proximal femur 1, a docking bolt 8 is penetrated through the internal thread of the threaded hole, a docking ring 9 is threadedly penetrated through the proximal femur 1 through the docking bolt 8, a rotating shaft 10 is inserted inside the docking ring 9, a clamping plate 11 is rotatably connected to the surface of the rotating shaft 10, a femoral external support structure 12 is provided inside the proximal femur 1, a femoral internal support structure 13 is provided inside the femoral external support structure 12, a femoral head 14 is sleeved on the surface of the femoral internal support structure 13, an extension bolt 15 is penetrated through the internal thread of the proximal femur 1, and the extension bolt 15 is threadedly penetrated by a docking plate 16 and a distal femur 17 from top to bottom.

[0024] As a preferred implementation in this embodiment, Figure 2 and Figure 3As shown, a fixing ring 3 is provided inside the fixing hole 2, a positioning plate 4 is provided on the upper surface of the proximal femur 1, a stress belt 5 is covered on the surface of the proximal femur 1, a positioning hole 6 is provided on the surface of the proximal femur 1, a bolt ring 7 is provided inside the positioning hole 6, a threaded hole is provided on the lower surface of the proximal femur 1, a docking bolt 8 is penetrated through the internal thread of the threaded hole, a docking ring 9 is threadedly penetrated through the proximal femur 1 by the docking bolt 8, a rotating shaft 10 is inserted inside the docking ring 9, and a clamping plate 11 is rotatably connected to the surface of the rotating shaft 10, the proximal femur 1 is honeycombed inside, the stress belt 5 is located in the middle of the proximal femur 1, and the stress belt 5 is made of flexible material, a plurality of fixing holes 2 are provided on the surface of the proximal femur 1, and different types of fixing rings 3 can be replaced inside the fixing holes 2, a plurality of positioning holes 6 are provided on the surface of the proximal femur 1, and different types of bolt rings 7 can be replaced inside the positioning holes 6, the fixing hole 2 provided on the surface of the proximal femur 1 is located at the greater trochanter of the proximal trabeculae, and the proximal femur 1 is provided with a fixing hole 2 The positioning hole 6 is located at the lesser trochanter of the trabeculae. After the patient is measured and planned for relevant preoperative parameters such as the horizontal / vertical distance of the rotation center, the proximal femur 1 is 3D printed with a femoral prosthesis. The fixing ring 3 and the bolt ring 7 can be replaced with various models and sizes according to the patient's parameters. The femoral prosthesis with different deflection distances and neck lengths from the patient can meet the biomechanical reconstruction needs of the proximal femur of different types of fractures. The proximal femur 1 can be customized according to the thickness and strength of the trabeculae according to the patient's weight. The docking ring 9 provided on the lower surface of the proximal femur 1 can position the proximal femur 17 proximally to avoid the phenomenon of loosening of the distal femur 17 fixed by the threaded structure due to the movement of the patient. The individualized 3D printed trabecular design of the proximal femur can provide effective bone support for the proximal femoral fracture fragment, achieve bone mechanical stability in the early stage, facilitate bone ingrowth in the long term, achieve biological fixation of the proximal femur, facilitate bone structure support, maintain the tension of the soft tissue gluteus medius and vastus lateralis, and restore the efficiency of the gluteus medius and the ideal lever arm.

[0025] like Figure 2 and Figure 4As shown, in this embodiment, the proximal femur 1 is provided with a femoral external support structure 12, the femoral external support structure 12 is provided with a femoral internal support structure 13, the surface of the femoral internal support structure 13 is sleeved with a femoral head 14, the proximal femur 1 is threaded with an extension bolt 15, the extension bolt 15 is threaded with a docking plate 16 and a distal femur 17 from top to bottom, and the surface of the positioning plate 4 is provided with a reinforcement ring 18, which is adapted to the femoral external support structure 12. The femoral head 14 can be sleeved on the surface of the femoral internal support structure 13, and the internal thread of the proximal femur 1 is penetrated by an extension bolt 15, and the extension bolt 15 is threadedly penetrated by a docking plate 16 and a distal femur 17 from top to bottom. The surface of the positioning plate 4 is provided with a reinforcement ring 18, and the reinforcement ring 18 is adapted to the femoral external support structure 12. According to different preoperative needs of patients, the femoral head 14 can be adjusted. 4 can be customized, and the inner femoral support structure 13 and the outer femoral support structure 12 can also be connected to the native femoral head. The reinforcement ring 18 is provided to enhance the stress of the inner femoral support structure 13 and the outer femoral support structure 12 to avoid deformation. The inner femoral support structure 13 is a 3D printed material, which can increase the internal stress and reduce deformation. At the same time, it makes the smooth bone cement of the outer femoral support structure 12 more plastic. The extension bolt 15 is also to increase the supporting force inside the distal femur 17 to avoid the femoral deformation in the later stage and shorten the life of the prosthesis.

[0026] How this utility works:

[0027] After preoperative measurement and planning parameters for the patient, a 3D printed femoral prosthesis is performed on the proximal femur 1. The fixing ring 3 and the bolt ring 7 can be replaced with various models and sizes according to the patient's parameters. The femoral prosthesis with different deflection distances and neck lengths can meet the biomechanical reconstruction needs of the proximal femur of different types of fractures. The proximal femur 1 can be customized according to the thickness and strength of the trabeculae of the patient's weight. The docking ring 9 provided on the lower surface of the proximal femur 1 can position the proximal end of the distal femur 17 to avoid the threaded structure. The fixed distal femur 17 may become loose due to the movement of the patient. The femoral head 14 can be customized according to the different preoperative needs of the patient, and the internal femoral support structure 13 and the external femoral support structure 12 can also be connected to the native femoral head. The reinforcement ring 18 is provided to enhance the stress of the internal femoral support structure 13 and the external femoral support structure 12 to avoid deformation. The bolt 15 is extended to increase the supporting force inside the distal femur 17 to avoid femoral deformation in the later stage and shorten the life of the prosthesis.

[0028] Finally, it should be noted that the above is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A customized joint for intertrochanteric fracture of the femur in the elderly, comprising the proximal femur (1), characterized in that: The surface of the proximal femur (1) begins to have a fixing hole (2), the interior of the fixing hole (2) is provided with a fixing ring (3), the upper surface of the proximal femur (1) is provided with a positioning plate (4), the surface of the proximal femur (1) is covered with a stress belt (5), the surface of the proximal femur (1) is provided with a positioning hole (6), the interior of the positioning hole (6) is provided with a bolt ring (7), the lower surface of the proximal femur (1) is provided with a threaded hole, the internal thread of the threaded hole is penetrated by a docking bolt (8), and the proximal femur (1) is threadedly penetrated by the docking bolt (8) through the docking ring (9), a rotating shaft (10) is inserted into the interior of the docking ring (9), a clamping plate (11) is rotatably connected to the surface of the rotating shaft (10), an external femoral support structure (12) is provided inside the proximal femur (1), an internal femoral support structure (13) is provided inside the external femoral support structure (12), a femoral head (14) is sleeved on the surface of the internal femoral support structure (13), an extension bolt (15) is threadedly penetrated through the internal thread of the proximal femur (1), and the extension bolt (15) is threadedly penetrated through the docking plate (16) and the distal femur (17) in sequence from top to bottom.

2. The customized joint for intertrochanteric fracture of the femur in the elderly according to claim 1, characterized in that: A reinforcement ring (18) is provided on the surface of the positioning plate (4), and the reinforcement ring (18) is adapted to the femoral external support structure (12).

3. The customized joint for intertrochanteric fracture of the femur in the elderly according to claim 1, characterized in that: The proximal femur (1) is honeycomb-shaped inside, the stress band (5) is located in the middle of the proximal femur (1), and the stress band (5) is made of a flexible material.

4. The customized joint for intertrochanteric fracture of the femur in the elderly according to claim 1, characterized in that: The surface of the proximal end of the femur (1) is provided with a plurality of fixing holes (2), and fixing rings (3) of different models can be replaced inside the fixing holes (2).

5. The customized joint for intertrochanteric fracture of the femur in the elderly according to claim 1, characterized in that: A plurality of positioning holes (6) are provided on the surface of the proximal end of the femur (1), and bolt rings (7) of different models can be replaced inside the positioning holes (6).

6. The customized joint for intertrochanteric fracture of the femur in the elderly according to claim 1, characterized in that: The femoral external support structure (12) and the femoral distal end (17) are made of a smooth bone cement handle.

7. The customized joint for intertrochanteric fracture of the femur in the elderly according to claim 1, characterized in that: The fixing hole (2) provided on the surface of the proximal femur (1) is located at the greater trochanter of the proximal trabeculae, and the positioning hole (6) provided on the surface of the proximal femur (1) is located at the lesser trochanter of the trabeculae.

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