JPH11318930A - Osteosynthesis device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an osteosynthesis device facilitating jointing work and positively holding a firm fixed state in a correct position. SOLUTION: An osteosynthesis device is provided with a lug screw 15, a tube plate 1, a tube 7, a set screw 201, a compression screw 25, and a washer 203 interposed between the set screw 201 and the outside of a receiving part of the tube plate 1 and positioned in a most settled place while rotating appropriately at the time of thread-fastening the set screw 201 to the head part of the tube 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an osteosynthesis device used for joining a fractured part of a femoral neck, for example, when the neck is fractured. The present invention relates to a device devised so that it can be joined and a strong fixed state can be easily obtained.

[0002]

2. Description of the Related Art As an osteosynthesis device, for example, there is an osteosynthesis device disclosed in Japanese Utility Model Registration No. 3044923. This is by the present applicant. FIG. 6 shows the configuration. FIG. 6 is a diagram showing a configuration of an osteosynthesis device for joining a fracture that has occurred in a neck portion 101a of a femur 101. The fracture portion is indicated by reference numeral A in the figure.

[0003] First, there is a tube plate 1, which is arranged along the side of the femur 101. A hemispherical receiving part 3 is formed at the upper end of the tube plate 1 in FIG. A through hole 5 is formed in the hemispherical receiving portion 3.

A tube 7 is arranged inside the receiving portion 3 (in a hole formed on the side of the femur 101). This tube 7 has a hemispherical head 9,
And movably engages with the receiving portion 3 via. The tube 7 has a hollow portion 11, and a female screw portion 13 is formed on the inner peripheral side of the head 9. The surface of the receiving portion 3 has a satin finish (a rough state),
The surface of the head 9 also has a satin finish. Thereby, a large frictional force is obtained to increase the fixing force.

There is also a lag screw 15 having a hexagonal shaft portion 17 having a hexagonal cross section. A male screw portion 19 is formed at the tip of the shaft portion 17. Further, a female screw portion 20 is formed on the inner peripheral surface on the base side of the shaft portion 17. The lag screw 15 is inserted into a hole formed in advance from the femur 101 to the head 103 and is screwed and joined to a female screw formed in the hole on the side of the head 103.

A set screw 21 is disposed outside the receiving portion 3 of the tube plate 1, and the set screw 21 has a male screw portion 23 which is screwed to the female screw portion 13 of the tube 7. ing. Also, a compression screw 25 is provided outside the set screw 21.
Is installed, and this compression screw 25
Is formed with a male screw portion 27 that is screwed into the female screw portion 20 on the lag screw 15 side.

The tube plate 1 has a plurality of through holes 31 through which a cortical screw 29 as a fixing screw passes. Also, tube plate 1
Is formed with a through-hole 35 for passing a cantilever screw 33 as a fixing screw.

According to the above configuration, for example, the femur 101
If a fracture occurs in the neck 101a of the femur,
A hole having a predetermined depth is drilled from No. 1 to the head 103, and a female screw portion is threaded on the side of the head 103. Next, the lag screw 15 is screwed into the female screw portion, and the tube 7 is inserted and arranged. At that time, the base of the lag screw 15 is inserted into the hollow portion 11 in the tube 7.

Further, the tube plate 1 is arranged along the side of the femur 101 so as to be along. Then, the set screw 21 is screwed into the female screw portion 13 of the head 9 of the tube 7 through the through hole 5 of the receiving portion 3 of the tube plate 1.
Thereby, the tubes 7 are fixed to the tube plate 1. Next, the compression screw 25 is screwed into the female screw portion 20 at the base of the lag screw 15 through the set screw 21. As a result, the rag screw 15 and, consequently, the head 103 are drawn toward the femur 101. Then, compression is applied to the fracture A. After that, a plurality of cortical screws 2 from outside of the tube plate 1
9. Screw the canillet screw 33 into the femur 101 to fix it in its entirety.

[0010]

According to the above-mentioned conventional configuration, there are the following problems. That is, according to the conventional configuration, the head 9 of the tube 7 and the receiving portion 3 of the tube plate 1 are both hemispherical, and the tube 7 can freely move in all directions with respect to the tube plate 1. Can be made, whereby the tube 7 and thus the lag screw 1
5 can be adapted to any direction with respect to the tube plate 1. However, there is a problem that the joining operation of the set screw 21 and the tube 7 is difficult to perform, and the set screw 21
After joining to the tube 7, misalignment may occur within the range of play between the set screw 21 and the through hole 5 of the tube plate 1, thereby firmly fixing the correct position. There was a problem that the state might be damaged.

The present invention has been made on the basis of the above-mentioned points, and it is an object of the present invention to facilitate the joining operation and to surely hold a strong fixed state at a correct position. To provide a simple osteosynthesis device.

[0012]

In order to achieve the above-mentioned object, an osteosynthesis device according to a first aspect of the present invention is a lag screw which is screwed from one bone side to be joined to the other bone side. And a tube plate provided along the side surface of the one bone and having a receiving portion having a through hole; and a base of the lag screw disposed between the lag screw and the tube plate, and receiving the tube plate. A tube having a head movably engaged with the inside of the tube, a set screw screwed into the tube from outside the tube plate to fix the tube to the tube plate, The screw is screwed into the lag screw through the set screw, and the lag screw and, consequently, the other bone is placed on one bone side. A compression screw to be stretched, and a washer which is interposed between the set screw and the outside of the receiving portion of the tube plate and is rotated at an appropriate position when screwing the set screw to the head of the tube, and which is located at a position where the calm is most comfortable. It is characterized by having.
In the osteosynthesis device according to the second aspect, in the osteosynthesis device according to the first aspect, the washer has a shape in which a through hole is formed at an eccentric position in the hemispherical body, and the top of the hemispherical body is cut and removed. It is characterized by doing.

That is, a washer is arranged between the set screw and the receiving portion of the tube plate, and when the set screw is screwed into the tube, the washer is automatically rotated to a position where it is most comfortable while rotating appropriately. In this state, a fastening and fixing state is obtained. Therefore,
Regardless of the direction in which the lag screw and tube are arranged with respect to the tube plate, the washer is automatically rotated accordingly and automatically located at the most calm point, ensuring a strong fixed state. Not only can be obtained, but also the workability is greatly improved.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The same parts as those in the related art are denoted by the same reference numerals, and description thereof is omitted. In the case of the present embodiment, the part of the conventional set screw 21 is constituted by a new set screw 201 and a washer 203. First, as shown in FIG. 5, the set screw 201 includes a head portion 205 and a shaft portion 207, and a male screw portion 209 is formed on an outer peripheral portion of the shaft portion 207. . The male thread 209 is screwed into the female thread 13 of the head 9 of the tube 7. Further, a through hole 210 having a hexagonal cross section is formed. The compression screw 25 passes through the through hole 210.

The washer 203 is inserted between the set screw 201 and the through hole 5 of the tube plate 1, and the lag screw 15 and the tube 7 are connected to the tube plate 1. Regardless of the orientation, the set screw 201
Is provided so as to be easily screwed / joined to the female screw portion 13 of the head 9 of the tube 7 and to obtain a strong fixed state.

The shape of the washer 203 will be described with reference to its manufacturing process. First, as shown in FIG. 2, a hemispherical material 211 is prepared, and as shown in FIG. 3, the axis 211 is shifted from the original axis 211 by a predetermined amount with respect to the original axis a. A line b is set, and a through hole 213 having a predetermined diameter is formed around the axis b. Next, as shown in FIG.
The upper part of the material 211 is cut and removed along the cutting line 215. Finally, as shown in FIG.
Is cut and removed along the line, thereby obtaining the washer 203 according to the present embodiment. As a result, the washer 203 has a shape having an outer peripheral surface 203a that can freely move with respect to the through hole 5 side.

The operation will be described based on the above configuration. For example, when a fracture occurs in the neck 101a of the femur 101, a hole having a predetermined depth is drilled from the femur 101 to the head 103, and a female thread is threaded on the side of the head 103. Next, the lag screw 15 is screwed into the female screw portion, and the tube 7 is inserted and arranged. At this time, the base of the lag screw 15 is
It is inserted into the hollow part 11 inside.

Further, the tube plate 1 is arranged on the side of the femur 101 so as to be along the same. Then, the set screw 201 is screwed into the female screw portion 13 of the head 9 of the tube 7 through the through hole 5 of the receiving portion 3 of the tube plate 1 via the washer 203. At this time, the direction in which the lag screw 15 and the tube 7 are arranged with respect to the tube plate 1 is arbitrary, but when the set screw 201 is screwed in, the lag screw 1
In accordance with the directionality of the tube 5 and the tube 7 with respect to the tube plate 1, the washer 203 is positioned at the most calm position while rotating appropriately, and in the event that the set screw 201 is screwed, a strong fixed state is obtained. You will get.

Next, the compression screw 25 is screwed into the female screw portion 20 at the base of the lag screw 15 through the set screw 201. As a result, the rag screw 15 and, consequently, the head 103 are drawn toward the femur 101. Then, compression is applied to the fracture A. After that,
From the outside of the tube plate 1, a plurality of cortical screws 29 and a cantilever screw 33 are connected to the femur 101.
To secure the whole.

According to the present embodiment, the following effects can be obtained. That is, the set screw 20
When 1 is screwed into the female screw portion 13 of the head 9 of the tube 7, the washer 203 functions effectively, and a strong fixed state can be easily obtained. This is because the washer 203 rotates appropriately in accordance with the directionality of the lag screw 15 and the tube 7 with respect to the tube plate 1, and its outer peripheral surface 203 a rotates while sliding on the edge of the through hole 5 of the tube plate 1. This is because a calm point is automatically found and located there. Therefore, first, the joining operation is greatly facilitated as compared with the related art, and it is possible to prevent the joint from being loosened after the joining.

[0021]

As described above in detail, according to the osteosynthesis device of the present invention, when the set screw is screwed into the female screw portion of the head of the tube, the washer functions effectively to provide a firm fixation. The state can be easily obtained. This is because the washer is appropriately rotated according to the directionality of the lag screw and the tube with respect to the tube plate, automatically finds the most calm place, and is located there. Therefore, first, the joining operation is greatly facilitated as compared with the related art, and it is possible to prevent the joint from being loosened after the joining.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of the present invention, showing a state in which a fracture of a neck of a femur is joined using an osteosynthesis device.

FIG. 2 is a view showing an embodiment of the present invention, and is a front view sequentially showing manufacturing steps for explaining the shape of a washer.

FIG. 3 is a view showing one embodiment of the present invention, and is a cross-sectional view sequentially showing a manufacturing process for explaining a shape of a washer.

FIG. 4 is a view showing one embodiment of the present invention, and is a cross-sectional view sequentially showing a manufacturing process for explaining a shape of a washer.

FIG. 5 is a view showing one embodiment of the present invention, and is a cross-sectional view sequentially showing a manufacturing process for explaining a shape of a washer.

FIG. 6 is a view showing a conventional example, and is a view showing a state in which a neck fracture of a femur is joined by a conventional osteosynthesis device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tube plate 3 Receiving part 5 Through-hole 7 Tube 9 Head 11 Hollow part 13 Female screw part 15 Lug screw 25 Compression screw 201 Set screw 203 Washer

Claims (2)

[Claims] 1. A lag screw which is screwed from one bone side to be joined to another bone side, and a receiving part which is arranged along a side surface of the one bone and has a through hole. A tube plate, a tube arranged between the lag screw and the tube plate, a base having a lag screw inserted therein, and a head having a head movably engaged with an inside of a receiving portion of the tube plate; A set screw that is screwed into the tube from outside the plate and fixes the tube to the tube plate;
A compression screw outside the tube plate and screwed into the lag screw through the set screw, thereby pulling the lag screw and thus the other bone to one bone side; and a compression screw outside the receiving portion of the set screw and the tube plate. And a washer interposed between the set screw and a washer positioned at the most calm place while rotating appropriately when screwing the set screw to the head of the tube. 2. The osteosynthesis device according to claim 1, wherein the washer has a shape in which a through hole is formed at an eccentric position in the hemisphere, and a top of the hemisphere is cut and removed. Osteosynthesis device.