WO2006133643A1

WO2006133643A1 - An intramedullary nail

Info

Publication number: WO2006133643A1
Application number: PCT/CN2006/001320
Authority: WO
Inventors: Yijing Yang
Original assignee: Yijing Yang
Priority date: 2005-06-15
Filing date: 2006-06-14
Publication date: 2006-12-21
Also published as: CN2805702Y

Abstract

An intramedullary nail, which is composed of a rod-like nail body (2) and locking boltholes (1) provided at the proximal and distal ends of the nail body, wherein the distance (d) from the distal locking boltholes to the distal tip is larger than 3 cm, and wherein the cross-section of the distal tip presents a blade-like flat shape.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of orthopedic surgical treatment instruments in medicine, and more particularly to a device for positioning a bone in a bone cavity in a hospital for treating a fracture. BACKGROUND OF THE INVENTION In the event of a fracture, it is necessary to fix the intramedullary head of the fracture. One of the treatments is to implant an intramedullary nail for fixing the injured nail head in the fractured bone cavity. The intramedullary nail is made of a rod-shaped rigid material, which is straight and curved. The ends of the rod are provided with radial locking screw holes for implanting the intramedullary nail into the medullary cavity. The cobalt bone hole is fixed on the bone of the corresponding part of the screw hole, and then the bone is fixed on the intramedullary nail through the locking screw hole. The end of the nail body first entering the bone cavity is called the distal end, and the end of the bone cavity is called the near end. end. The distal end of the intramedullary nail is provided with a locking screw hole. After the intramedullary nail is driven into the medullary cavity, a cobalt bone hole is placed on the bone, and then the intramedullary nail is locked with the bone by placing a locking screw. In the operation of the cobalt bone hole, the axial line of the bone hole on both sides must coincide with the axis line of the locking screw hole, otherwise the locking screw will not be placed, resulting in failure of operation. The distance between the distal end of the existing intramedullary nail and the locking screw hole is not more than 2 cm, and the shape of the tip is mostly blunt circular or elliptical. According to the bone end structure, the intramedullary nail When implanting the bone cavity, the distal end of the nail body can only hang at the end of the medullary cavity. In the cobalt bone hole, the distal end of the nail body or the bone is easily swayed and rotated, and the deviation from the predetermined position makes the locking screw hole difficult or even impossible. Coincidence with the bone pores of the cobalt causes difficulty in surgery and even failure of operation. There are also some intramedullary nails that use some auxiliary devices or perform surgical operations under X-ray. Although the intramedullary nail can achieve stable fixation, the structure is complicated, the operation is cumbersome, the operation cost is high, and it is used. Radiation surgery can also cause harm to patients and medical personnel.

In view of the above, it is necessary to provide an intramedullary nail having a simple structure, which is convenient for surgical operation, and can accurately overlap the cobalt bone hole and the nail body locking screw hole, thereby accurately and stably fixing the fracture site. SUMMARY OF THE INVENTION The object of the present invention is to provide an intramedullary nail which is simple in structure and easy to operate, and mainly solves the problem that the commonly used structural intramedullary nail penetrates into the bone cavity and causes the cobalt bone hole and the nail body in the bone cavity. The problem that the locking screw holes are difficult to overlap.

The object of the present invention is achieved as follows: The distance (d) of the distal locking screw hole to the end is greater than 3 cm, and the distal end of the distal end has a flat shape of "one".

The cross-section of the "one" shape described in the above scheme is parallel to the axis of the locking screw hole.

Preferably, the distal end is wedge-shaped.

Preferably, the intramedullary nail has a flat rectangular hole near the proximal end or a flat rectangular groove at the proximal end.

Preferably, the axis of the locking screw hole is in a plane, and the plane is a longitudinal central section of the intramedullary nail body, and the plane is also a flat rectangular hole or groove of the proximal end and a distal end A central section.

Since the above solution is used, the present invention has the following beneficial effects as compared with the prior art: It increases the distance between the distal end of the intramedullary nail and the locking screw hole to more than 3 cm, so that the intramedullary can be performed during surgery The distal end of the nail is broken into the epiphysis, so that the distal end of the nail can only be suspended at the end of the medullary cavity. In the case of the cobalt bone hole, the distal end of the nail or the bone is easily swayed and rotated, and the position is deviated from the predetermined position. The distal end of the intramedullary nail of the present invention has a flat shape of a "one" shape in cross section, which facilitates the intramedullary nail to enter the medullary cavity easily during surgery, and makes the intramedullary nail difficult with respect to the conical distal end. Rotation in the medullary cavity increases the positional stability of the intramedullary nail in the medullary cavity; the longitudinal central section of the axis of the locking screw hole of the intramedullary nail is also a central section of the flat rectangular hole or groove, so the rectangle The hole or groove can serve as a reference for the orientation of the locking screw hole, and the rectangular hole facilitates removal of the intramedullary nail. It can be seen from the above that the intramedullary nail of the present invention easily ensures that the bone hole of the drilled hole coincides with the axis of the locking screw hole of the nail body, reduces the difficulty of surgery, ensures the success of the operation, and has a simple structure, compared with the intramedullary nail with the auxiliary device. Reduced surgical costs. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of the structure of the present invention.

Figure 2 is a left side view of Figure 1. BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be further described in detail below with reference to specific examples and with reference to the accompanying drawings. In the embodiment shown in FIG. 1 and FIG. 2, the present invention consists of a rod-shaped body 2 and a proximal end and a distal end of the body. The locking screw hole 1 of the end is formed. The distance between the locking screw hole 1 of the distal end and the end of the end is 3 cm. The end of the distal end is a dome-shaped shape, and the cross section thereof is flat in a "one" shape. "The orientation of the glyph is parallel to the axis of the locking screw hole on the shank; the intramedullary nail has a flat rectangular groove at the proximal end; the axis of the locking screw hole is in a plane, and the plane is the intramedullary nail body A longitudinal center section, and the plane is also a flat rectangular groove of the proximal end and a central section of the distal tip wedge. This structure allows the surgeon to insert the distal end of the intramedullary nail into the metaphyseal end of the medullary canal during the intramedullary nail implantation procedure. The intramedullary nail or the distal part of the bone can be avoided when drilling the bone hole and removing cobalt. Shake the rotation due to the force, to ensure that the bone hole of the cobalt coincides with the locking screw hole during the operation, so that the locking screw can smoothly pass from the bone hole to the locking screw hole, so that the three-point line is not abnormally fixed.

In another embodiment of the present invention, there is no flat rectangular groove in the proximal end, but a flat rectangular hole (not shown) near the top end of the proximal end, and other structures are the same as in the above embodiment. The longitudinal center profile of the axis of the locking screw hole of the intramedullary nail is also a central section of the proximal flat rectangular hole, so the rectangular hole can serve as a reference for the orientation of the locking screw hole, and the rectangular hole facilitates the removal of the intramedullary nail.

Therefore, it can be seen from the above preferred embodiments of the present invention that the intramedullary nail of the present invention utilizes a longer distal end to enable it to reach the callus, thereby preventing the nail from rotating or shaking during the operation, and adding The flat rectangular hole or groove at the proximal end of the upper nail body can be used as a reference for the orientation of the locking screw hole, so the intramedullary nail of the present invention can smoothly solve the problem that the drilled bone hole and the nail body locking screw hole do not easily overlap. While the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the invention, and various modifications and improvements can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the claims.

Claims

Rights request

An intramedullary nail comprising a rod-shaped nail body and a locking screw hole provided at a proximal end and a distal end of the nail body, wherein: the distal end locking screw hole to the end end The distance (d) is greater than 3 cm, and the distal end of the distal end has a flat shape of "one".

2. An intramedullary nail according to claim 1 wherein said cross-section has a "one" shape oriented parallel to the axis of said locking screw bore.

The intramedullary nail according to claim 1 or 2, wherein the distal end is wedge-shaped.

The intramedullary nail according to claim 1 or 2, wherein the intramedullary nail has a flat rectangular hole near the proximal end or a flat rectangular groove at the proximal end.

The intramedullary nail according to claim 4, wherein the axis of the locking screw hole is in a plane, and the plane is a longitudinal central section of the intramedullary nail body, and the plane is also a proximal end. A flat rectangular hole or groove of the head and a central section of the distal head.