JPH0312145A - Bone plate - Google Patents

Abstract

PURPOSE:To shorten time for the operation of simple fracture and to treat crushed fracture without fail by covering the part of the fracture with a 'centipede-shaped' bone plate and easily mounting the bone plate to the part of the fracture. CONSTITUTION:In both side edge parts 2 of a main body 1, legs 3 are formed in a multiple shape like the legs of a centipede. The bending degree of the main body 1 or the length, width and interval of the legs 3 are not especially specified but can be arbitrarily selected corresponding to the shape or size of the bone. When such a bone plate is used, the U-shaped main body 1 is wholly fitted to the tube-shaped long bone. Further, the legs 3 formed in the multiple shape in the both side edge parts 2 are strong springs and strongly support the bend bone from the both sides. Thus, the stability of the bone plate is extremely improved and the bone can be bored directly from a screw hole 4 by a drill while the bone plate is temporarily mounted to the part of the fracture. Further, when a screw is fastened by a driver, the end of the corrected fracture is not deviated.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an innovative "mukade-type" bone plate that is effective in the osteotomy treatment of fractures, especially comminuted fractures.

(B) Prior Art A conventional bone plate is as shown in FIG. 4. That is, the main body (1) is an elongated flat plate made of metal, and a plurality of screw holes (4) are provided along the center line of the main body (1).

(c) Problems to be Solved by the Invention Conventional bone plates have been used in the following manner. In other words, in the case of a so-called simple fracture in which a long bone such as the humerus, forearm, tibia, or femur is broken in two, the skin is incised in the usual way, the muscles are separated, and once the fracture is reached, both fracture ends are separated. 1Ilv! The fracture is then repaired by carefully aligning the fractured ends.

At that time, muscles that have lost their support due to broken bones contract significantly and are difficult to repair, so muscle relaxants and tranquilizers are administered to patients and animals in advance.

Next, after fixing the fracture ends with old tube forceps so that they do not come apart, the 0 position is determined, where the bone plate will be attached, by straddling the fracture and along the central axis of the bone.
Use a divider to accurately mark the screw location on the bone plate, matching the spacing between the screw holes on the bone plate. After drilling a mark with a drill that is thinner than the diameter of the screw, place the bone plate on top of the bone and insert the screw with a screwdriver.

Start tightening the screws close to the fracture end, and tighten the remaining screws, being careful not to displace the fracture ends or dislodge the bone plate from the central axis of the bone.

Finally, antibiotics are poured, and the subcutaneous tissue and skin are sutured to complete the surgery.

However, traditional bone plates used in this way
No consideration was given to the fact that the long pipe was tubular, and the shape was a simple flat plate, so it had very poor stability when placed on a bone.

Although using a bone plate that is smaller than the size of the bone improves stability, it lacks practicality in terms of strength.

As a result, the bone plate that is placed on top of the bone moves loosely, so when drilling screw holes in the bone, the bone plate must be removed, and when tightening the screws with a screwdriver, an assistant must hold the bone plate. It was extremely difficult to handle. Not only that, it is extremely difficult to tighten the screws, and even though a highly experienced and skilled surgeon took the time to attach the screws with the utmost care, the properly aligned fracture ends could not be properly aligned after the bone plate was attached. The bone plate tends to shift or twist, or the bone plate may come off the central axis of the bone, and it often takes time to redo it.

Even simple fractures have these inconveniences, so in the case of comminuted fractures where the bone is shattered,
Traditional bone plates were of little use.

In other words, for osteoarthritis treatment of comminuted fractures, it is not enough to simply attach a combination of large and small bone plates; depending on the situation, it may also be necessary to use wire fastening methods, but these attachments take a long time and are expensive. The presence of the wire inhibited bone new formation, and there were many cases in which the fracture ends did not heal. Moreover, it is extremely impossible to bind all the finely broken bone fragments together.
Broken limbs would be shortened by the amount of bone fragments that were discarded, and if they were unsteady, they tended to leave serious after-effects.

The problem to be solved by this invention is to make it easier to attach a bone plate to a fractured part, thereby shortening the operation time for simple fractures and making it possible to reliably treat comminuted fractures.

(d) Means for Solving the Problems Regarding the means for solving the problems described above, the inventor of this invention conducted various experiments using experimental equipment.

The first prototype was a stainless steel colander welded to a conventional bone plate, and it was hoped that complete recovery would be achieved by storing small bone fragments in the colander, but the contraction force of the muscles was so strong that during surgery A colander without a core has become deformed. Next, they made a prototype cylinder with many circular holes and tried fitting the fractured end and bone fragments into the cylinder, but although the strength was perfect, the bone and muscle did not fuse quickly. It ended in failure. After many years of experimentation, the inventor finally completed this invention.

The bone plate according to the present invention has successfully solved the above problem, and the solution will be explained based on FIG. 1.

FIG. 1 is a perspective view showing a "mukade-type" bone plate according to the present invention. (1) shows a main body formed in a U-shape. On both side edges (2) of the main body (1),
The legs (3) are multi-limbed, like the legs of Mukade. The degree of curvature of the main body (1) and the length, width, spacing, etc. of the legs (3) are not particularly limited, and can be arbitrarily selected according to the shape and size of the bone.

(E) Function The bone plate according to the present invention shown in FIG. 1 is used for osteotomy treatment of comminuted long bone fractures in the following manner.

First, the length of the opposing healthy bone is measured in advance using an X-ray image or the like. In addition, although it is practically impossible to repair a complicatedly damaged tube end to its original shape, it is necessary to avoid severing the muscles attached to the bone fragments and to arrange the bone fragments as much as possible. I collected all the bone fragments while trying not to go crazy.

Then, this "mukade-type" bone plate is placed over the fracture site, and rolled to make the fracture fragments more visible while bringing the proximal and distal bone fragments closer to their original shape.Then, the screw holes in the main body are After bringing it into the surgeon's field of vision, the legs are closed in order, screwed, and fixed at a position that is equal in length to the normal leg. Then, select pieces of bone that are large enough to be screwed together and fix them to the bone plate with screws. Finally, every tiny bone fragment is inserted into the fracture end or the gap between the fixed bone fragments, and the legs are closed to complete the bone grafting surgery for the comminuted fracture.

(f) Effects of the Invention When the bone plate according to the present invention is used, the U-shaped main body (1) fits completely into the long tubular tube. Furthermore, the multi-limbed m (3) formed on the side edges (2) on both sides act as strong springs, firmly supporting the broken bone from the sides.

Therefore, the stability of the bone plate is significantly improved, and it becomes possible to directly drill into the bone through the screw holes while the bone plate is temporarily attached to the fracture site. Moreover, when tightening the screws with a screwdriver, there is no need to worry about the repaired fracture end shifting or twisting, or the bone plate coming off the center axis of the bone, so the fixation work can be completed extremely easily and in a short time. You will be able to do this. Since the finished product is in good condition, there is no need for troublesome redoing, the surgical time is significantly shortened, and the fatigue of the surgeon and assistant is significantly reduced.

In the case of a comminuted fracture, by using the "mukade-type" bone plate according to this invention, the fixation position of the bone plate attached to the fracture site can be freely adjusted, and the broken bone can be restored to its original length. You will be able to do this. What's more, it is now possible to completely collect even minute bone fragments, which could not be bundled in the past, by cradling them with its multi-limbed legs. Small irregularly gathered bone fragments also act as fillers to promote bone union. Therefore, there are no adverse effects such as inhibition of bone new generation due to the use of wires, and after-effects such as limb shortening are also prevented, making it possible to obtain satisfactory treatment results.

Moreover, since the U-shaped bone plate has significantly higher strength than the conventional plate-shaped bone plate, deformation of the bone plate due to poor care of the patient or animal can be prevented.

As a result, the number of cases in which a cast is unnecessary will increase, and even in cases where a cast is worn, the time required for use will be significantly shortened.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a bone plate according to the present invention. FIG. 2 is a perspective view showing how the invention is used in comminuted fractures. FIG. 3 is a perspective view showing an example of a comminuted fracture of a long tube. FIG. 4 is a perspective view of a conventional bone plate. 1--Main body 2-M-Side edge 3--Leg 4--Screw hole

Claims (1)

[Claims] 1. A bone plate characterized in that a main body (1) is formed in a U-shape, and legs (3) are formed in a multi-limb shape on both sides of the side edges (2).