CN211409309U

CN211409309U - Proximal intramedullary nail of femur

Info

Publication number: CN211409309U
Application number: CN201920918677.1U
Authority: CN
Inventors: 冯卫; 薛飞
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-06-19
Filing date: 2019-06-19
Publication date: 2020-09-04
Anticipated expiration: 2029-06-19

Abstract

The utility model discloses a proximal femoral intramedullary nail, which comprises a main nail and a spiral blade, wherein the main nail is of a cylindrical structure, a pin groove is formed on the outer wall of the far end, a bending point is formed in the middle part, and a connecting hole is formed on the body of the proximal nail; the spiral blade penetrates through the connecting hole and is fixedly connected with the main nail, the far end of the spiral blade is columnar, and the near end of the spiral blade forms a spiral head. The utility model provides a proximal femoral intramedullary nail, which is matched with the anatomical parameters of the Chinese hip and is suitable for the anatomical characteristics of the Chinese hip, has the characteristics of simple and convenient clinical operation and easy mastering, and reduces the interference to the outer side wall of the femur.

Description

Proximal intramedullary nail of femur

Technical Field

The utility model belongs to the field of orthopedics internal fixation materials, concretely relates to thighbone near-end intramedullary nail.

Background

Intertrochanteric femoral fractures are the more common fractures, accounting for about 3% -4% of total body fractures. With the advance of the modernization process, the traffic industry and the construction industry develop unprecedentedly, and the aging of the society is further aggravated, so that the incidence rate of femoral intertrochanteric fracture tends to rise year by year. The intertrochanteric fracture is mainly treated by surgery, and the internal fixation mode gradually takes intramedullary fixation represented by proximal femoral anti-rotation intramedullary nail (PFNA) as the main factor. PFNA is a novel and special internal fixation system developed by AO company on the basis of PFN, the treatment purpose of the PFNA is mainly for patients with severe osteoporosis in proximal femoral fracture, and the advantage of unstable proximal femoral fracture is more obvious. The PFNA design data used in China at present are from European and American races, the proximal femur anatomical features of Chinese and Western people have a plurality of differences, the existence of the differences can certainly influence the morphological matching relationship between the endophyte and the proximal femur, and the intramedullary nail is difficult to insert due to the angle of the intramedullary nail in clinical application; the proximal end of the intramedullary nail is higher than the top of the tuberosity to cause hip pain and walking disorder; the thick proximal diameter of the intramedullary nail causes the fracture of the lateral cortex of the femoral tuberosity and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects in the prior art, and provides a proximal femoral intramedullary nail which solves the problem caused by the difference between the morphological matching of an internal implant and the proximal femoral end in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

a proximal femoral intramedullary nail, which comprises a main nail and a spiral blade,

the main nail is of a cylindrical structure, a pin groove is formed in the outer wall of the far end of the main nail, a bending point is formed in the middle of the main nail, and a connecting hole is formed in the nail body of the near end of the main nail;

the spiral blade penetrates through the connecting hole and is fixedly connected with the main nail, the far end of the spiral blade is columnar, and the near end of the spiral blade forms a spiral head.

The main nail external deflection angle alpha of the main nail is 6 degrees.

The outer diameter of the proximal end of the main nail is larger than that of the distal end of the main nail.

The proximal end diameter R of the main nail is 16 mm.

The vertical distance d from the bending point on the main nail to the top end of the proximal end of the main nail is 95 mm.

The proximal end length D of the main nail is 62 mm.

The proximal top surface of the main nail forms a central hole.

The axis of the connecting hole and the axis of the near end of the main nail form an acute angle.

The spiral head of the spiral blade is implanted into the greater trochanter of the femur.

The main nail is implanted into the femoral stem.

Compared with the prior art, the invention has the beneficial effects that:

the utility model provides a thighbone near-end intramedullary nail, with chinese hip anatomical parameter phase-match, be fit for chinese hip anatomical feature, have the characteristics of easy and simple to handle with the clinical operation that traditional PFNA is the same, the interference to the thighbone lateral wall has been reduced, reduce the incidence that traditional PFNA destroys the thighbone lateral wall effectively because of the change of near-end diameter, the design of its near-end length can effectively prevent that the top from revealing in big tuberosity point portion and arousing the hip pain, its main nail declination makes the main nail insert the pulp cavity more smoothly with the improvement of bending some distance, be to traditional thighbone near-end intramedullary nail PFNA's structure and the innovation on the theoretical basis.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic structural view of the main nail of the present invention;

fig. 3 is a top view of the proximal end of the main nail of the present invention.

1 main nail 2 spiral blade

3 pin slot 4 bending point

5 a screw head 6 central hole.

Detailed Description

The proximal intramedullary nail of the femur of the present invention will be described in detail with reference to the drawings and embodiments of the specification:

example 1

As shown in figures 1-3, a proximal intramedullary nail for femur comprises a main nail 1 and a helical blade 2,

the main nail 1 is of a cylindrical structure, a pin groove 3 is formed in the outer wall of the far end, a bending point 4 is formed in the middle of the main nail, and a connecting hole is formed in the nail body of the near end;

the spiral blade 2 penetrates through the connecting hole and is fixedly connected with the main nail 1, the far end of the spiral blade 2 is columnar, and the near end of the spiral blade forms a spiral head 5.

The main nail deflection angle alpha of the main nail 1 is 6 degrees.

The outer diameter of the main nail 1 at the near end is larger than that at the far end.

The proximal end diameter R of the main nail 1 is 16 mm.

The vertical distance d from the bending point 4 on the main nail 1 to the top end of the proximal end of the main nail 1 is 95 mm.

The proximal end length D of the main nail 1 is 62 mm.

The proximal top surface of the main nail 1 forms a central hole 6.

The axis of the connecting hole and the axis of the near end of the main nail 1 form an acute angle.

The spiral head 5 of the spiral blade 2 is implanted into the greater trochanter of the femur.

The main nail 1 is implanted into the femoral stem.

The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.

Claims

1. A proximal femoral intramedullary nail, characterized by: comprises a main nail (1) and a spiral blade (2),

the main nail (1) is of a cylindrical structure, a pin groove (3) is formed in the outer wall of the far end, a bending point (4) is formed in the middle of the main nail, and a connecting hole is formed in the nail body of the near end;

the spiral blade (2) penetrates through the connecting hole and is fixedly connected with the main nail (1), the far end of the spiral blade (2) is columnar, and the near end of the spiral blade forms a spiral head (5).

2. The proximal femoral intramedullary nail of claim 1, wherein: the main nail external deflection angle alpha of the main nail (1) is 6 degrees.

3. The proximal femoral intramedullary nail of claim 1, wherein: the outer diameter of the near end of the main nail (1) is larger than that of the far end.

4. The proximal femoral intramedullary nail of claim 1, wherein: the proximal end diameter R of the main nail (1) is 16 mm.

5. The proximal femoral intramedullary nail of claim 1, wherein: the vertical distance d from the bending point (4) on the main nail (1) to the top end of the near end of the main nail (1) is 95 mm.

6. The proximal femoral intramedullary nail of claim 1, wherein: the proximal end length D of the main nail (1) is 62 mm.

7. The proximal femoral intramedullary nail of claim 1, wherein: the top surface of the near end of the main nail (1) forms a central hole (6).

8. The proximal femoral intramedullary nail of claim 1, wherein: the included angle between the axis of the connecting hole and the axis of the near end of the main nail (1) is an acute angle.

9. The proximal femoral intramedullary nail of claim 1, wherein: the spiral head (5) of the spiral blade (2) is implanted into the greater trochanter of the femur.

10. The proximal femoral intramedullary nail of claim 1, wherein: the main nail (1) is implanted into the femoral stem.