JPH07213535A - Bone marrow pin for restoring bone - Google Patents

Abstract

PURPOSE:To provide a bone marrow pin for restoring bone that is securely and quickly able to treat a fracture of long bone or restore a lacked bone due to a compound fracture or tumor. CONSTITUTION:This pin is made of a pipe 1 with thickness which is enough to insert into the hollow of bone marrow almost tightly, and multiple through holes 2 are formed in the whole wall of the pipe 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to fracture treatment of long bones,
Alternatively, the present invention relates to an intramedullary pin for bone reduction that is used when repairing a bone lost due to a complicated fracture or a tumor.

[0002]

2. Description of the Related Art Fracture treatment is performed by reducing the stumps of fractured bones and fixing them so that they do not move as much as possible.

By the way, as a method of fixing fractured bones to each other, a method of fixing a plate along the outer surface of the bone and a method of inserting a pin into the bone marrow cavity of the bone and fixing the bone have been widely used. However, in recent years, the latter method using a pin has become mainstream.

This is because, as the mechanism of fracture treatment has been elucidated, it has been found that the pin can treat the fracture faster and more reliably than the plate.

That is, it is faster to treat the fractured ends of the fractured bone with a certain amount of force at all times, but the fracture treatment is faster. When the respective bones are fixed, the distance between the stumps of the bones is kept constant at the initial distance fixed by the surgery, so that no force is applied to the stumps of the bones so as to press or join them. On the other hand, when inserting a pin into the bone marrow cavity and fixing the fractured bone, the bone and the bone are always pressed and joined to support the weight, and the muscles around the bone also press and join the bone. As it is promoted, bone healing will be quick and reliable.

However, the fixing method using pins also has the following problems.

First, since the bone marrow cavity into which the pin is inserted is a space in which blood vessels supplying nutrients to bone and bone marrow fluid exist, a thick pin is inserted into the bone marrow cavity to fill the bone marrow cavity. Then, nutrients are not supplied to the bone, and the fusion of the bone is significantly delayed or does not heal.

For this reason, conventionally, it has been necessary to use a pin having a small diameter so that a sufficient space remains in the bone marrow cavity. If the diameter is smaller than the medullary cavity, the fractured bones are likely to be misaligned or twisted.

When the cylindrical bones are displaced from each other, the stump surfaces of the bones come into contact with each other at two points, which causes a problem that the fusion of the bones is significantly delayed.

If the fractured bone and the bone are twisted,
For example, when the femur is twisted, the toes are not oriented in the correct direction.

The problem of twisting of the bone can be prevented by the conventional technique of forming lateral holes at both ends of the pin and driving a narrower lateral stop nail into the lateral holes, but it is formed at both ends of the pin. In order to drive the lateral stop nail into the small lateral hole, it is necessary to check the position of the lateral hole of the pin inserted in the bone marrow cavity by seeing through the X-ray. There is a problem of being exposed to a large amount of radiation.

[0012] Therefore, the present invention provides an intramedullary pin for bone reduction capable of driving a lateral stop nail without causing bone misalignment, preserving the bone marrow, and without seeing through radiography. It is what

[0013]

An intramedullary pin for bone reduction according to the present invention comprises a pipe having a thickness that can be inserted into a medullary cavity with almost no space, and the wall surface of the pipe penetrates the wall surface. A large number of through holes are formed.

[0014]

The above-mentioned pipe is inserted into the medullary cavity with almost no space, so that the bones do not shift from each other.

Since a large number of through holes are formed on the entire wall surface of the pipe, even if the pipe is inserted into the bone marrow cavity without a gap, the flow of blood or the like is not hindered and the through holes are formed. Nourishment is supplied to the bone through.

Further, since a large number of through holes are formed on the wall surface of the pipe, when the lateral stop nail is driven in, the through hole through which the lateral stop nail is inserted can be easily found even if the lateral stop nail is not seen through. It becomes possible.

[0017]

Embodiments of the present invention will be described below.

The intramedullary pin for bone reduction according to the present invention is shown in FIG.
As shown in, the pipe 1 is formed with a large number of through holes 2 formed on the entire wall surface. As shown in FIG. 2, the pipe 1 is formed to have a thickness that can be inserted into the bone marrow cavity without a gap.

Materials for forming the pipe 1 include stainless steel and titanium alloy.

The through hole 2 is formed as a long hole whose one end side is long in the length direction, and the other is formed as a circular hole having a size through which the lateral stop nail A can be inserted.

Fracture treatment using the intramedullary pin for bone reduction configured as described above is performed as follows.

A pipe 1 having a thickness to be inserted into the bone marrow cavity of a fractured bone with almost no space is prepared. And this pipe 1
Is inserted into the bone marrow cavity between the fractured bone and the bone to reduce the fractured bone and the bone. After that, using a very fine drill, a hole is drilled at a location away from the fracture end, one of the many through holes 2 formed in the wall surface of the pipe 1 is searched, and then this bone hole is enlarged by a drill. Next, after drilling a bone hole through the bone hole to the bone on the opposite side, the lateral stop nail A is attached to the bone shown in FIG.
Drive in as shown in. Through hole 2 on the wall of pipe 1
Since many are formed on the entire surface, one through-hole 2 can be easily found by making a hole with an ultra-fine drill.

In the embodiment shown in FIG. 2, a lateral stop nail A is used.
However, two pipes are driven so as to be orthogonal to the pipe 1. In this way, when the through hole 2 on one end side of the pipe 1 is formed into a long hole and the lateral stop nail A is driven into this long hole,
Since the lateral stop nail A becomes movable in the longitudinal direction within the through hole 2 of the long hole, the force of pressing and joining the fractured bone and the stump surface of the bone by the weight and the like works, and the fusion of the bone is quick, Definitely done.

[0024]

As described above, when the intramedullary pin for bone reduction according to the present invention is used, there is an effect that the fracture treatment of a long bone can be performed quickly and surely.

[Brief description of drawings]

FIG. 1 is a front view with one part omitted showing an embodiment of an intramedullary pin for bone reduction according to the present invention.

FIG. 2 is a cross-sectional view showing a usage state of the same as above.

[Explanation of symbols]

 1 Pipe 2 Through Hole A Lateral Nail B Bioactive Bone Cement

Claims (3)

[Claims] 1. An intramedullary pin for bone reduction, comprising a pipe having a thickness that can be inserted into a medullary cavity with almost no space, and having a large number of through holes penetrating through the wall surface of the pipe. 2. An intramedullary pin for bone reduction, characterized in that a through hole provided on one end side of the pipe is formed as an elongated hole elongated in the length direction of the pipe. 3. The intramedullary pin for bone reduction according to claim 1 or 2, wherein the pipe is made of a titanium alloy or stainless steel.