JPH11137565A - Fracture bonding tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fracture bonding tool which is an inner fixing type without performing special operation. SOLUTION: A metal-made pipe supporting shaft 1 inserted into the medullary cavity 3 of one fracture part 2 from the fracture site 4, a metal-made pipe supporting shaft 5 inserted into the medullary cavity 7 of another fracture part 2 from the fracture site 4, a spring 8 for thrusting provided at the bottom end of the pipe of the above metal-made pipe supporting shaft 1 and a metal- made slender shaft inner bar 9 inserted through both metal-made pipe supporting shafts, are provided and this slender shaft inner bar 9 is once pushed in against the spring 8 in the bottom end of the pipe of one fracture part side and a part of the slender shaft inner bar 9 returned by elastic spring of the spring 8 is fitted into the metal-made pipe supporting shaft 5 on another fracture part side and bonding of both fracture sites is made by inner fixing with the metal- made double shaft constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fracture connector for connecting various skeletal fractures, including those of small animals such as pets and humans, using special metal rods.

[0002]

2. Description of the Related Art In general, as a fracture connector for treating a fracture site, for example, a patch plate and a bandage or a cast are simply combined so as to prevent misalignment on the outer surfaces of both fractured portions. There are known a simple bone connector, an externally fixed fracture connector in which a metal plate applied to the outer surface of a fracture portion and a screw inserted into the metal plate are directly screwed into the broken portion.

[0003] In addition, as a mode recently used for treating a fracture of a small animal such as a pet or the like, a simple fracture treatment of an internally fixed type in which a stainless steel metal rod is inserted into the bone marrow cavity of a bone is also known. As described above, as the internally fixed type in which the metal rod is inserted into the medullary cavity and the fracture is connected, a single thin metal rod as in the past was simply placed at the joint position above the fracture point (proximal joint end). It is inserted into the bone marrow cavity of the broken bone portion while being inserted into the muscle in a cone-shape manner from above, and in this state, the distal end of the metal rod is inserted into the bone marrow cavity of the other broken bone portion to be internally fixed. In this aspect, at least the muscles of the joints which are not directly related to the fracture are damaged, so that it is not a preferable treatment method.

[0004] As a method for improving this point, recently, FIG.
(A) and (B), the fracture sites c and b are respectively placed in the medullary cavities b and b 'of the two fractured bone portions a and a' as shown in FIG.
c, two metal rods f, f having a fine shaft configuration, which have been cut to a predetermined length in advance, are inserted so as to reach the inner ends, respectively. A so-called tenon fitting connection for fitting the receiving recess h to the male and female is used, and a fracture joint which does not damage the muscle of the joint is used.

[0005]

However, even in the case of an internal fixation type fracture connector for inserting a metal rod as described above from a fracture site, the connection structure is such that the convex shaft g of one metal rod f is connected to the other. In a simple structure (mortise fitting) in which the metal rod f is simply inserted into the receiving recess h, the length (connection margin) of the convex shaft g to be tenoned is limited to a short length (for example, in the case of a φ5 mm metal rod). , The convex shaft part to be the tenon part is φ3mm and the length is about 10mm),
For this reason, the shaft connecting portion is weak, and the connecting portion is easily broken by receiving only a small bending load, so that it is often necessary to perform another fracture treatment.

[0006] Further, in the fracture joint of the tenon fitting structure, at the time of treatment (when the opposing metal rods are connected), one of the fractured bones is once at least as long as the length of the convex shaft g (mortise). If it is not shifted, the receiving recess h of the other metal rod facing the axis
Not fit in, the order is troublesome and requires absolutely minimal incision surgery, which is intended to take more time to recover naturally surgical site.

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, the present invention has a double shaft configuration in which a metal pipe support shaft inserted into the medullary cavity of both fractured bones and a narrow shaft middle bar fitted in the metal pipe support shaft are indwelled. The object of the present invention is to provide a fracture connector that solves the above problems.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a metal pipe supporting shaft having a predetermined length inserted into a bone marrow cavity of one fractured bone portion from the fracture site, and a bone marrow cavity of the other fractured bone portion. A metal pipe support shaft of a predetermined length to be inserted from the fracture site, a delivery spring inserted into the inner end of the pipe of the one metal pipe support shaft, and a predetermined length of the metal pipe support shaft inserted through both metal pipe support shafts. In addition to forming a metal narrow shaft middle bar, a fine shaft middle bar is arranged at the back end of the metal pipe support shaft from the fracture site on the metal pipe support shaft facing the bone marrow cavity of the one fractured portion. A part of the narrow shaft, which is pushed in once against the spring provided and is returned by the spring of the spring, is fitted to a metal pipe support shaft facing the bone marrow cavity of the other broken part, and both fracture sites Of the metal double shaft configuration It is intended to fixed.

In this case, the metal pipe support shaft having a predetermined length has a size from the fracture site to the far end of the medullary cavity.

[0010] Further, a metal thin shaft middle bar of a predetermined length extends from a deep position excluding a compression length of a feeding spring disposed at a far end on at least one metal pipe support shaft to a fracture site. It is a long dimension.

As described above, this fracture connector inserts two metal pipe support shafts of a predetermined length from the fractured fracture site to the bone marrow cavities of both fractured bone portions to the far end.
On one of the metal pipe support shafts, a small extension spring is inserted and set deep inside the pipe.
Thereafter, the base end of the metal pipe supporting shaft is compressed while a metal thin shaft middle bar is compressed against the resilience of the spring in the pipe of the metal pipe supporting shaft on which the spring is disposed. Until the metal pipe support shaft of the other folded part is aligned with the metal pipe support shaft with respect to the metal pipe support shaft in this state, and the bar of the thin shaft pushed in by appropriate means is released. The bar is inserted into the other opposing metal pipe supporting shaft by an amount (length) pushed back by the spring, and the opposing metal pipe supporting shaft is attached to the fractured portion at the fracture site. The shaft is connected to form a double-shaft configuration, and is firmly fixed inside.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a fracture connector according to the present invention.

FIGS. 1 to 5 show an embodiment of a fracture connector in which a single-shaft metal pipe support shaft is mounted in a medullary cavity. Reference numeral 1 denotes a metal pipe support shaft of a predetermined length which is inserted (punched) into the medullary cavity 3 of one fractured bone part 2 from the fractured part 4 to the far end 3a, and 5 is the bone marrow of the other fractured part 6 A metal pipe support shaft having a predetermined length inserted into the cavity 7 from the fracture site 4 to the far end 7a. Reference numeral 8 denotes a small feeding spring which is inserted into the inner end 1a of the metal pipe support shaft 1 inside the pipe. Reference numeral 9 denotes a metal thin shaft middle bar having a predetermined length inserted as a shaft fit over the two metal pipe support shafts 1 and 5, and the length of the metal thin shaft middle bar 9 is at least the length of the spring. 8 is set to a long dimension which is a length obtained by subtracting the compressed length from the length of the metal pipe support shaft 1. That is, the metal thin shaft middle bar 9 has a length that can be immersed in one of the metal pipe support shafts 1. The fracture connector 10 is composed of four metal members, namely, the metal pipe support shafts 1 and 5, the feeding spring 8, and the metal thin shaft middle bar 9. In this case, the metal pipe support shafts 1, 5
The spring 8 for feeding and the middle bar 9 made of a metal are made of a metal such as stainless steel, titanium alloy or the like which does not cause rust. The diameter of the metal pipe support shafts 1 and 5 is
For example, it is a thin pipe shaft of about φ5 mm.

To explain the operation, when joining a fractured part in a predetermined skeleton, first, in a treatment room or the like, X-rays are applied to each fractured bone part 2, 6 in a normal bone length s to irradiate each bone marrow. The lengths t 'and t "of the cavities 3 and 7 are measured, and a length corresponding to the lengths is cut from a metal pipe support shaft 1A having an appropriate length of one shaft, and a predetermined length of metal The pipe supporting shafts 1 and 5 are formed, and the single metal thin shaft bar 9A is also formed by cutting the metal thin shaft bar 9 of a predetermined length (see FIG. 4).

Here, a metal pipe support shaft 1 set to a predetermined length is inserted into the medullary cavity 3 of one broken bone portion 2 from the fracture site 4 to the far end 3a by hammering or the like, and the other broken bone portion 2 is inserted. However, if the metal pipe support shaft 5 is inserted into the medullary cavity 7 up to its deep end 7a, the base end of each metal pipe support shaft 1, 5 is located at least on the line of each fracture site 4, 4. It will be. In other words, the metal pipe support shafts 1 and 5 set to a fixed length may be inserted into the bone marrow cavities 3 and 7 from the fracture sites 4 and 4 serving as folding openings.

Thereafter, a small-diameter extension spring 8 is similarly mounted on the metal pipe support shaft 1 mounted on one broken bone portion 2 in the same pipe from the fractured portion 4 to the inner end 1a of the pipe.
Insert and set by appropriate means (not shown).

Next, the metal rod 9 is attached to the metal pipe supporting shaft 1 of the broken part 2 and the spring 8 is disposed from the fracture part 4 to the back end of the metal pipe supporting shaft. The base end 9a is once pushed to the same position as the edge 1b of the metal pipe support shaft 1 or to a position where the base end 9b is immersed while pressing against the pressure. In this state, the bent portion 6 is bent and the metal pipe support shaft 5 is connected to the metal pipe support shaft 1.
When the restriction on the pushing of the metal thin shaft middle bar 9 is released after being positioned linearly, the thin middle shaft bar 9 is pushed back due to the elasticity of the spring 8 at the back end. The tip part (part) of the shaft middle bar 9 is fitted into the pipe of the metal pipe support shaft 5 facing the proper length by a suitable length, so that the double shaft of the broken part of the fracture site 4, 4 is formed. The part 11 is formed to form a robust joint structure.

That is, in the connection operation using the fracture joint device 10, the narrow shaft middle bar 9 is merely connected to the one fractured portion 2
After pushing once against the spring 8 into the metal pipe support shaft 1 disposed in the medullary cavity 3 of the bone, it is only necessary to release the pushing of the bar 9 in the thin shaft in this state, and the two broken bone parts 2, 6 can be achieved by a simple operation without performing an incision operation for widening the facing distance.

Another embodiment shown in FIGS. 6 and 7 uses a plurality of metal pipe supporting shafts 1 and 5 to be inserted into the medullary cavities 3 and 7 in the form of a fracture of a thick bone such as a human skeleton. And two are installed side by side). In this case, one broken bone part 2
The metal pipe support shafts 1, 1 set to a predetermined length in the same manner as above are inserted from the fracture site 4 to the far end 3a, and the metal pipe support shaft The shafts 5 and 5 are inserted and set to the back end 7a. After that, the feeding springs 8, 8 are inserted into one of the metal pipe supporting shafts 1, 1 in the same manner as described above, and the small shaft middle bars 9, 9 are further inserted into the metal pipe supporting shafts 1, 1, respectively. The metal pipe supporting shafts 5, 5 are pushed inward against the rebound and the other broken bone portion 6 is bent again to make the metal pipe supporting shafts 5, 5 straight with respect to the metal pipe supporting shafts 1, 1. When the pressing of the two small shafts 9 and 9 is released, a part of the two narrow shaft bars 9 and 9 is inserted into the metal pipe supporting shafts 5 and 5, and the double shaft portions 11 and 11 are formed at the broken bone portions, thereby being robust. Joint structure.

In the above embodiment, the diameter of the metal pipe support shaft is adjusted by combining two large and small diameter pipe support shafts corresponding to the space of the medullary cavity, or by using the same diameter pipe support shaft. Is also good. It is also possible to freely combine three pipe support shafts.

Furthermore, the cross-section of the medullary cavity is not perfectly circular, so that even if a metal pipe support shaft is inserted, a gap remains between the pipe support shaft and the bone, so that the bone is not affected. In addition, in the case of a complicated fracture such as a crushed fracture, external fixation such as applying an appropriate splint may be used in combination until bone fusion is recognized.

[0022]

As described above, the fracture connector of the present invention has two metal pipe supporting shafts of a predetermined length to be inserted into the medullary cavity of both fractured portions, and one of the metal pipe supporting shafts. A so-called internal fixation type fracture connector for indwelling the medullary cavity with a simple configuration consisting of an extension spring disposed at the far end and a metal thin shaft bar inserted into the pipe against the spring, so that fracture joining is performed. As a work, a metal pipe support shaft is inserted directly into the bone marrow cavity of both fractured bones from the fracture site without performing special incision surgery on the fractured part as before, and a spring is interposed in one pipe support shaft Then, the metal shaft is pushed in and the pipe support shaft of the opposing broken bone part is returned straight in this state, and the pushing in of the shaft is released, and the bar in the shaft is resilient. Pushed back and some others Automatically becomes the axle fitting in the pipe support shaft, thereby simplifying the internal fixation of metal dual-axis configuration in a short time. In this case, since the bar portion in the narrow shaft having a long length as a whole over the width longer than at least the connection of the conventional tenon fitting has a double-shaft configuration in which both pipe supporting shafts are fitted.
It has a robust joint structure, does not break even when subjected to a large load, and is a mode that can withstand long-term use and is safe.

In the case of a fracture joint in the form of a vertical fracture, if a spring for dispensing is provided above the metal pipe support shaft which is on the upright side in the pair of metal pipe support shafts. The metal thin shaft middle bar that fits inside has its own weight applied to obtain the shaft fitting that constantly sinks down, and the lower metal thin shaft middle bar is securely inserted into the lower metal thin shaft bar and does not come off. .

Further, since the length of the metal pipe supporting shaft to be inserted into both fractured bone portions is set by X-ray measurement according to the depth of the medullary cavity, an accurate insertion set matching the fracture site can be made. Also from this point, a reliable double-shaft configuration can be obtained and the configuration is robust.

Of course, since the number of the metal pipe supporting shafts can be used in accordance with the space of the medullary cavity (a plurality of pipe supporting shafts are possible), even a small animal thin skeleton or a human thick skeleton can be used. This is advantageous in that it is optimal as a fracture connector for various types of fractures.

[Brief description of the drawings]

FIG. 1 is a side view showing a main part of one embodiment of a fracture connector according to the present invention.

FIG. 2 is an explanatory view showing a main part of the fracture joint.

FIG. 3 is a perspective view showing the two metal pipe support shafts, one thin shaft middle bar, and one feeding spring.

FIG. 4 is a perspective view of a metal pipe support shaft, a thin shaft middle bar, and a feeding spring before predetermined dimensions are set.

FIG. 5 is an explanatory diagram of both broken bone parts.

FIG. 6 is an explanatory view showing another embodiment using a plurality of metal pipe support shafts.

FIG. 7 is a cross-sectional plan view of the main part.

8A and 8B show a conventional internal fixation type fracture joint, wherein FIG. 8A is an explanatory view showing a state in which both fractured parts are separated from each other and before a tenon of a metal supporting shaft is fitted, and FIG. It is explanatory drawing which fitted the support shaft tenon.

FIG. 9 is an explanatory diagram of the metal support shaft.

[Explanation of symbols]

 Reference Signs List 1 metal pipe support shaft 2 broken bone part 3 bone marrow cavity 4 fracture site 5 metal pipe support shaft 6 broken bone part 7 bone marrow cavity 8 feeding spring 9 metal thin shaft middle bar 11 double shaft configuration

Claims (3)

[Claims] 1. A metal pipe support shaft having a predetermined length inserted into the bone marrow cavity of one fractured bone from the fracture site, and a metal pipe support shaft having a predetermined length inserted into the bone marrow cavity of the other fractured bone from the fracture site. Forming a metal pipe support shaft, a delivery spring inserted into the back end of the one metal pipe support shaft, and a metal narrow shaft bar having a predetermined length inserted through both metal pipe support shafts. In addition, the metal pipe supporting shaft facing the bone marrow cavity of the one fractured portion is provided with a metal thin shaft middle bar from the fracture site against the spring provided at the back end of the metal pipe supporting shaft. Then, a part of the narrow bar, which is returned by the spring of the spring, is fitted to a metal pipe support shaft facing the bone marrow cavity of the other broken part, and the joint of both fractured parts is made of metal two. It is specially fixed internally with a heavy shaft configuration. Fracture joints to be characterized. 2. The fracture connector according to claim 1, wherein the metal pipe support shaft having a predetermined length has a dimension from a fracture site to a distal end of a medullary cavity. 3. A metal middle shaft bar having a predetermined length extends from a deep position excluding a compression length of a delivery spring disposed on a back end of at least one metal pipe support shaft to a fracture site. The fracture connector according to claim 1, which has a long dimension.