CN204121154U - A kind of Novel thighbone near-end 1/3rd cast dissection bone plate - Google Patents

Abstract

The utility model discloses a novel tubular anatomical bone plate of the proximal third of the femur, which comprises a bone plate body. The bone plate body includes an upper arc-shaped part and a lower straight part. The top of the upper arc-shaped part is a hump-shaped protrusion. , There are three large threaded holes in the shape of an inverted pin under the hump-shaped protrusion, and a sliding screw hole is provided under the middle of the large threaded hole in the inverted pin. The arc of the radial section of the lower straight part is 1/3 circle, and the lower straight part is set There are multiple small threaded holes in a non-linear arrangement. The utility model has the beneficial effects of assisting the proximal femur fracture operation, reducing the contact area between the bone plate and the subplate bone, effectively protecting the blood circulation of the fixed bone segment, avoiding early temporary osteoporosis near the bone plate, facilitating fracture healing, reducing Complications of internal fixation failure due to broken nails and broken plates.

Description

A new tubular anatomical bone plate of the proximal third of the femur

technical field

The utility model belongs to the technical field of medical instruments, and relates to a novel tubular anatomical bone plate of the proximal third of the femur.

Background technique

With the prolongation of human life expectancy and the intensification of social aging, the number of patients with proximal femoral fractures has gradually increased, and it has become a common type of fracture in the elderly. Firm internal fixation allows early mobilization of the patient and is considered the standard method for the treatment of proximal femoral fractures. At present, the internal fixation systems for the treatment of proximal femoral fractures are divided into extramedullary fixation and intramedullary fixation. Extramedullary fixation is represented by the dynamic hip screw (DHS), which is mainly used for stable fractures of the proximal femur. Intramedullary fixation is represented by the proximal femoral nail (PFN), which is the first choice for comminuted unstable fractures of the proximal femur. fixed method. With the continuous improvement of internal fixation system design and the maturity of surgical methods, the treatment effect of proximal femoral fractures is becoming more and more ideal, but there is still a certain failure rate. The failure of internal fixation for proximal femoral fractures mainly manifests as screw cutting out, plate screw breakage, coxa varus, fracture nonunion or delayed union.

Studies have shown that severe osteoporosis in elderly patients, selection of internal fixation systems, and unreasonable surgical procedures lead to the inability of internal fixation systems to achieve reliable and effective fixation, which is the main reason for the failure of internal fixation for proximal femoral fractures.

Utility model content

The purpose of this utility model is to provide a new type of proximal femur 1/3 tubular anatomical bone plate, which solves the problem that the current proximal femur fracture operation does not have a corresponding bone plate, which leads to the failure of internal fixation of proximal femoral fracture.

The technical solution adopted by the utility model is to include the bone plate body, the bone plate body includes an upper arc part and a lower straight part, the top of the upper arc part is a hump-shaped protrusion, and three inverted products are arranged below the hump-shaped protrusion. The large threaded hole in the shape of a font is provided with a sliding screw hole in the middle of the large threaded hole with an inverted character. The arc of the radial section of the lower straight part is 1/3 circle, and the lower straight part is provided with a plurality of non-linearly arranged small threaded holes.

Further, the diameter of the three large threaded holes in reverse shape is 4.5 mm, and the diameter of the small threaded holes is 3.5 mm.

Further, the upper arc portion protrudes forward at 40°.

The beneficial effect of the utility model conforms to the anatomical structure of the bone plate, achieves reliable internal fixation, and prevents internal fixation failures such as screw cutting out and broken nails and plates.

Description of drawings

Fig. 1 is a schematic diagram of the side structure of a novel proximal femoral anatomical bone plate of the present invention;

Fig. 2 is a schematic diagram of the front structure of a novel proximal femoral anatomical bone plate of the present invention.

In the figure, 1. bone plate body, 2. upper curved part, 3. lower straight part, 4. hump-shaped protrusion, 5. large threaded hole, 6. sliding screw hole, 7. small threaded hole.

Detailed ways

The utility model will be described in detail below in conjunction with specific embodiments.

The proximal 1/3 of the femur is a tubular anatomical bone plate, and the bone plate body 1 includes two parts: an upper curved part 2 and a lower straight part 3 . The side of the upper arc-shaped part 2 is arc-shaped, and the convex face is forward. The proximal end of the upper arc-shaped part 2 is provided with three large threaded holes 5 arranged in an inverted "pin" shape, and the far end of the upper arc-shaped part 2 is provided with sliding screw holes 6. ; The lower straight part is a 1/3 pipe shape, that is, the arc is 1/3 of the circumference, and is provided with a plurality of non-linearly arranged small threaded holes 7 . Thickening treatment is done at the junction of the upper curved portion 2 and the lower straight portion 3 . The entire plate fits the anatomy.

Figure 1 is a side view of the bone plate. The side of the proximal end of the bone plate is arc-shaped, protruding forward at 40°, close to the anatomical structure of the greater trochanter of the femur, so that the bone plate can fit better with the subplate bone.

As shown in Figure 2, three screw holes are provided at the proximal end of the upper arc-shaped part 2, arranged in the shape of an inverted "pin", and the diameter of the screw holes is 4.5 mm. They cooperate with hollow locking screws to achieve a triangular shape on the coronal and sagittal planes at the same time. Support, forming a three-dimensional support and fixation frame, providing a good holding force for the proximal femur, which can effectively prevent postoperative micro-movement of the screw on the sagittal and coronal planes, and reduce the cutting of the femoral head and neck bone by the screw. In turn, it can effectively prevent coxa varus deformity caused by postoperative screw cutting out and neck-shaft angle reduction. A Kirschner wire hole is provided on the upper and outer sides of the proximal end of the upper arc portion 2, which plays a role of temporary fixation during the operation and facilitates the operation. The distal end of the upper arc portion 2 is provided with an oblong sliding screw hole 6, which can be used to place nails from various directions, so as to better fix the fracture fragments of the lesser trochanter and its vicinity. The lower straight part 3 is a 1/3 tubular shape, with multiple non-linear small threaded holes 7 with a diameter of 3.5 mm, allowing more screws to be cross-implanted in different directions to prevent stress concentration and increase screw holding force. The tail end of the lower straight part 3 adopts a downwardly contracting conical surface, which facilitates the insertion of the bone plate during the operation.

The connection between the upper curved part 2 and the lower straight part 3 is thickened, and a small threaded hole 7 is provided on the upper part, which can effectively reduce the fatigue fracture of the bone plate at this part. The point-type limited contact design between the bone plate and the bone reduces the contact area between the bone plate and the bone under the plate, effectively protects the blood circulation of the fixed bone segment, avoids early temporary osteoporosis near the bone plate, and is conducive to fracture healing.

Compared with the prior art, the present invention has the following advantages:

1. The upper arc protrudes forward at 40°, close to the anatomical structure of the greater trochanter of the femur, so that the bone plate can fit better with the subplate bone. The proximal end of the upper arc part 2 is provided with three screw holes arranged in an inverted "pin" shape, which cooperate with the hollow locking screw to achieve triangular support on the coronal and sagittal planes at the same time, forming a three-dimensional support and fixation frame, which is the proximal femur Provides good holding force, which can effectively prevent postoperative micro-movement of the screw on the sagittal and coronal planes, thereby effectively preventing coxa varus deformity caused by postoperative screw cut-out and neck-shaft angle reduction. The distal end of the upper arc part 2 is provided with a sliding screw hole 6, which can be used to place nails from all directions to better fix the fracture piece. Increase the thickness of the connecting part to prevent fatigue fracture of the bone plate.

2. The lower straight part 3 is a 1/3 tube shape, and is provided with a plurality of non-linearly arranged small threaded holes 7, so that more screws can be implanted crosswise in different directions, so as to prevent stress concentration and increase the screw holding force.

3. Use point contact to reduce the contact area between the bone plate and the bone under the plate, reduce the damage to local blood circulation, and reduce the degree of local osteoporosis.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model in any form. Any simple modifications made to the above embodiments according to the technical essence of the present utility model are equivalent to changes and modifications. All belong to the scope of the technical solution of the utility model.

Claims (3)

1. a novel proximal femur one-third tubular anatomical bone plate is characterized in that: the bone plate body (1) comprises an upper arc portion (2) and a lower straight portion (3), and the upper arc portion (2 ) and the lower straight part (3) form a long strip with a middle protrusion, the top of the upper arc part (2) is a hump-shaped protrusion (4), and there are three reverse-shaped protrusions (4) below the hump-shaped protrusion (4). The large threaded hole (5), the bottom of the large threaded hole (5) with inverted characters is provided with a sliding screw hole (6), the arc of the radial section of the lower straight part (3) is a 1/3 circle, and the lower straight part (3) ) is provided with a plurality of non-linearly arranged small threaded holes (7). 2. according to claim 1, a kind of novel proximal femur one-third tubular anatomical bone plate is characterized in that: the diameter of the three large threaded holes (5) in the shape of an inverted pin is 4.5 mm, and the diameter of the small screw holes is 4.5 mm. The diameter of the threaded hole (6) is 3.5mm. 3. According to claim 1, a novel proximal femur one-third tubular anatomical bone plate is characterized in that: the upper arc portion (2) protrudes forward at 40°.