JPH0614938B2 - Bone plate - Google Patents

Description

Description: (a) Field of Industrial Application The present invention relates to an epoch-making “Mukadaka-shaped” bone plate that is effective in bone graft treatment of bone fractures, especially crushed bone fractures.

(B) Conventional Technology A conventional bone plate is as shown in FIG. That is, the main body (1) is an elongated flat plate made of metal, and a plurality of screw holes (4) are provided in the center line thereof. (C) Problems to be Solved by the Invention I was using it. That is, in the case of so-called simple fracture in which long bones such as the humerus, forearm, tibia, and femur are broken in two, so-called simple cuts are made, the muscles are divided, and when the fracture is reached, both fracture ends are cut. Make sure the fracture is aligned and repaired as it was originally. At that time, since the muscle whose bone is broken and loses its support is remarkably contracted and it is difficult to perform the repair work, a muscle relaxant or a tranquilizer is previously administered to the patient's patient.

Next, after fixing the fractured ends with a grasping forceps so that the fractured ends do not separate, the mounting position of the bone plate is determined so as to straddle the fractured portion and along the central axis of the bone. Once positioned, align the screw holes in the bone plate and use a divider to accurately mark the screw points on the bone. After drilling the mark with a drill smaller than the diameter of the screw, place the bone plate on the bone and insert the screw with a screwdriver.

The screwing begins near the fracture end, tightening the remaining screws, taking care not to dislocate the fracture end and to prevent the bone plate from slipping out of the medial axis of the bone.
Finally, pour in antibiotics, suture the skin and the skin, and finish the operation.

However, the conventional bone plate used in this way is
The long bones were tubular and the shape was a simple flat plate, so sitting on the bones, that is, the stability was very poor. If a bone plate smaller than the size of the bone is used, the stability is improved, but there is a pulsation that is not practical in terms of strength.

As a result, the bone plate placed on the bone will move loosely, so when drilling a screw hole in the bone, the bone plate must be removed, and even when tightening the screw with a screwdriver, hold the bone plate in the assistant. It was very difficult to handle, for example. Not only that, it is extremely difficult to tighten and tighten the screws, and even though the experienced and experienced operator took time to attach it with great care, the fractured ends that were properly aligned after the bone plate was attached It tended to slip, twist, or slip off the bone plate from the center axis of the bone, which often took time to redo.

Even in the case of a simple fracture, there are such inconveniences, so in the case of a crushed bone fracture or a broken bone,
Traditional bone plates have been of little use.

In other words, it is not enough to attach large and small bone plates in combination for osteoclastic treatment of crushed fractures, and it may be necessary to use a wire fastening method in combination depending on the situation, but these attachment operations require a long time. , It was not rare that the presence of the wire hindered bone renewal and the fracture ends were not fused. Moreover, since it is impossible to bind even one finely broken bone fragment to the rest, the broken limbs are shortened by the amount of the discarded bone fragment,
They tended to leave serious aftereffects such as lameness.

The problem to be solved by the present invention is to make it easy to attach a bone plate to a fractured part, shorten the operation time of a simple fracture, and surely treat a crushed fracture.

(D) Means for Solving the Problems Regarding the means for solving the problems described above, the inventor of the present invention conducted various experiments using experimental dogs.

The first prototype was made by welding a stainless steel colander to a conventional bone plate, and was expected to be completely cured by storing a small bone fragment in the colander. A monkey without a core has been deformed. Next, I made a prototype of a cylinder with a large number of holes, and tried to insert the fracture end and the bone fragment into the cylinder, but although it was satisfactory in terms of strength, the fusion of bone and muscle did not go ridiculously, It ended in failure. The present inventor finally completed the present invention as a result of repeating such experiments over many years.

The bone plate according to the present invention has excellently solved the above problems, and the means for solving the problems will be described with reference to FIG.

FIG. 1 is a perspective view showing a "medical" bone plate according to the present invention (1), which is a rectangular metal plate having a width that can surround the entire circumference of a long bone and has a U-shaped cross section. It shows a body molded to be. On both side edges (2) of the main body (1), legs (3) are formed in a multi-limb shape like a bare foot. The degree of curvature of the main body (1) and the length, width, interval, etc. of the legs (3) are not particularly limited and can be arbitrarily selected according to the shape and size of the bone.

(E) Operation The bone plate according to the present invention shown in FIG. 1 is used for bone grafting treatment for crushed fractures of long bones as follows. First, by using an X-ray image or the like in advance, Measure the length. In addition, it is practically impossible to restore a complicatedly broken bone end to its original shape, but the muscle attached to the bone fragment should not be separated as much as possible, and the arrangement of the bone fragment should be as accurate as possible. Collect all bone fragments while keeping in mind.

Then, cover the fractured part with this "mould-shaped" bone plate, and roll it to make the fractured part visible while making the proximal distal bones closer to their original shape. After seeing the operator's field of view, close the legs in order and fix them with screws, and fix them at a position where they are the same length as normal bone. In addition, select bone fragments that can be screwed and fix them to the bone plate with screws. Finally, one fine bone fragment is completely inserted into the fracture end or the gap between the fixed bone fragments, and the open leg is closed to complete the bone-fixing operation for the crush fracture.

(F) Effect of the Invention When the bone plate according to the present invention is used, the main body (1) having a U-shaped cross section fits snugly into the tubular long bone. In addition, the limb-like legs formed on the lateral edges (2) on both sides
(3) acts as a strong spring to firmly support the broken bone from the side.

Therefore, the stability of the bone plate is remarkably improved, and the bone plate can be directly drilled from the screw hole while the bone plate is temporarily mounted on the fractured part. Moreover, when the screw is tightened with a screwdriver, the repaired fractured end will not be displaced or twisted, and there is no concern that the bone plate will come off the center axis of the bone, so fixing work is extremely easy and completed in a short time. Will be able to. Since the finished condition is also good, no troublesome rework is required, the operation time is significantly shortened, and the fatigue of the operator and the assistant is significantly reduced.

In the case of crushed fracture, by using the "Mukadaka type" bone plate according to the present invention, the fixing position of the bone plate attached to the fracture part can be freely adjusted, and the fractured bone can be restored to its original length. You will be able to. In addition, even small bone fragments that could not be united in the past can be held by the legs with multi-limbed legs so that all of them can be completely focused. And, even small irregularly collected bone fragments act as a filler that promotes bone union. Therefore, there is no harmful effect such as the inhibition of bone formation due to the use of the wire, and the after-effects such as the shortening of the limbs can be prevented, and a satisfactory therapeutic result can be obtained.

Moreover, since the bone plate having a U-shaped cross section has a remarkably higher strength than the conventional flat plate-like product, it is possible to prevent the bone plate from being deformed due to inadequate patient disease. Therefore, the number of cases where the cast is unnecessary increases, and even when the cast is worn, the use period can be significantly shortened.

[Brief description of drawings]

FIG. 1 is a perspective view showing a bone plate according to the present invention. FIG. 2 is a perspective view showing a usage state of the invention product in a crush fracture. FIG. 3 is a perspective view showing an example of a long bone crush fracture. FIG. 4 is a perspective view showing a conventional bone plate. 1 ... Main body, 2 ... Side edge 3 ... Leg, 4 ... Screw hole

Claims (1)

[Claims] 1. A main body (1) is obtained by molding a rectangular metal plate having a width capable of enclosing the entire circumference of a long bone so as to have a U-shaped cross section. 2), Bone plate in which (2) is intermittently excised and a multilimbed leg (3) is connected.