JP3113928U - Osteosynthesis device - Google Patents

Abstract

An osteosynthesis that can prevent inadvertent fluctuations in the mounting position of a tube with respect to a tube plate, can regulate inadvertent rotation of a lug screw, and can simplify the configuration and facilitate the work. Providing equipment.
A lug screw 25 that is screwed from one bone side toward the other bone side, a tube plate 5 that is disposed along a side surface of the one bone and has a through hole, and between the lug screw and the tube plate. A tube 13 that is disposed and is detachably attached to the tube plate and has a hollow portion corresponding to the through hole, and the base portion of the lug screw is inserted into the hollow portion, and the through hole and the hollow portion from the outside of the tube plate A compression screw 35 that is screwed to the lug screw and pulls the other bone toward one bone side, and a position holding means 44 that holds the attachment position of the tube to the tube plate.
[Selection] Figure 1

Description

  The present invention relates to an osteosynthesis device used, for example, for joining a fractured portion of a femur at a neck fracture, and in particular, enables the holding position of a tube to a tube plate to be held, and the lack of a lag screw. The present invention relates to a device that is devised so as to simplify the configuration and facilitate the work while restricting the prepared rotation.

  As an osteosynthesis apparatus, there exist patent document 1 and patent document 2, for example.

Utility Model Registration No. 3044923 JP 2003-38508 A

Patent Document 1 and Patent Document 2 are both filed by the applicant for utility model registration. Among these, an example of the configuration of Patent Document 2 is shown in FIGS. FIG. 7 is a diagram showing a configuration of a part of the osteosynthesis device, and FIG. 8 is a diagram showing a state in which the fracture portion of the femur is joined using the osteosynthesis device. Further, in this case, as shown in FIG. 8, a fracture occurs in the neck portion 101a of the femur 101, and is a diagram showing a configuration of an osteosynthesis device for joining the fracture portion. The part is indicated by the symbol A. Moreover, the code | symbol 103 in FIG. 8 is a bone head.

  First, there is a tube plate 105, and this tube plate 105 is arranged along the side of the femur 101 as shown in FIG. The tube plate 105 includes a through-hole 107 formed in an inclined state on one end side (upper end side in the figure), and another tube plate 105 extends from the through-hole 107 toward the other end side (lower end side in the figure). Four fixing screw holes 109 are provided at a predetermined pitch. An engagement recess 110 is provided on the back side of the tube plate 105, and a guide groove 111 is formed on the inner peripheral side portion of the engagement recess 110. Further, the back side of the tube plate 105 is formed in a gentle arc shape along the femur 101.

As shown in FIGS. 7 and 8, a tube 113 is detachably attached to the tube plate 105 having the above configuration. The tube 113 includes a plate 115 as an insertion portion and a cylindrical body 117 that is integrated with the plate 115 in a vertical direction at a predetermined neck angle (α °). The plate 115 includes a stepped portion 116 on the outer periphery thereof. The plate 115 is guided while the stepped portion 116 is inserted into the guide groove 111 provided on the tube plate 105 side, and is attached to and detached from the engaging recess 110.
7 and 8 show a state in which the tube 113 is attached to the tube plate 105. FIG.

In addition, a hole 119 is formed in a connecting portion between the plate 115 and the cylindrical body 117, and another fixing screw hole 121 is formed below the hole 119. The hole 119 matches the through hole 109 on the tube plate 105 side, and the fixing screw hole 121 matches the fixing screw hole 109 on the tube plate 105 side. Further, the back side of the plate 115 is formed in a gentle arc shape along the femur 101 like the tube plate 105.
A hollow portion 123 is formed in the cylindrical body 117.

  A lag screw 125 is inserted into the cylindrical body 117. A male screw portion 127 is formed at the tip of the lug screw 125. The male threaded portion 127 has a tap function. Therefore, the outer peripheral portion is formed in a sawtooth shape (a jagged shape), and a notch portion 127a is formed in one circumferential direction. The lug screw 125 has a hollow portion 129, and the hollow portion 129 has a female screw portion 131. Further, a cylinder member 133 for retaining is press-fitted and fixed to the base portion of the lug screw 125. The inner peripheral surface of the cylindrical member 133 is hexagonal, and a hexagonal portion at the tip of a jig (not shown) is inserted. The jig is used when screwing the lag screw 125 to the bone head 103 side.

  In FIG. 8, reference numeral 135 denotes a compression screw, and reference numeral 137 denotes a coating screw as a fixing screw. The coating screw 137 is also screwed in the other three fixing screw holes 109, but only one location is shown in FIG.

An extension 151 is provided at the upper end of the tube plate 105, and a hole 153 for fixing screw insertion is formed in the extension 151. The extension 151 is extended in a state where it is inclined by a predetermined angle, and is configured to follow the side surface of the femur 101. Through the hole 153, a long cortical screw 155 is screwed to reach the bone head 103, thereby obtaining a stronger fixed state. That is, since the tube body 117 of the tube 113 is fixed on the upper and lower sides, it is possible to reliably prevent a positional shift and maintain a firm fixed state, and to prevent inadvertent rotation of the joining device. .

  The operation will be described based on the above configuration. For example, a case where a fracture has occurred in the neck portion 101a of the femur 101 will be described as an example. First, a hole having a predetermined depth is drilled from the femur 101 to the head 103. Inside the drilled hole, female screw processing is performed on the bone head 103 side. Then, the lug screw 125 is screwed there through the male screw portion 127. At that time, the base portion of the lug screw 125 is inserted into the hollow portion 123 of the cylindrical body 117 in the tube 113.

The above operation will be described in detail. First, the base portion of the lug screw 125 is inserted into the hollow portion 123 of the cylindrical body 117 of the tube 113. Further, the cylindrical member 133 is inserted from the opposite side of the hollow portion 132 of the cylindrical body 117 of the tube 113 and the tip of a jig (not shown) is inserted. The cylindrical member 133 is screwed through the male screw portion 127 while being press-fitted and fixed to the base portion of the lug screw 125.
The reason why the lug screw 125 itself has a tap function is that when the lug screw 125 is removed after a predetermined curing period has elapsed after joining, the lug screw 125 can be removed while being threaded using the tap function.

  Further, the cylindrical member 133 is press-fitted and fixed to the base of the lug screw 125, whereby the lug screw 125 is prevented from coming off from the tube 113. That is, when the lug screw 125 is pulled out to the tip end side of the tube 113, the cylindrical member 133 comes into contact with the edge portion of the hollow portion 123 of the cylindrical body 117 of the tube 113, and further disconnection is prevented. On the contrary, when the lug screw 125 is pulled out to the base side of the tube 113, the male screw portion 127 comes into contact with the edge of the hollow portion 123 of the cylindrical body 117 of the tube 113 to prevent further disconnection. .

  Next, the tube plate 105 is arranged along the side of the femur 101, and at that time, the plate 115 of the tube 113 is inserted into the engagement recess 110 of the tube plate 105. Next, the compression screw 135 is inserted into the cylindrical body 117 of the tube 113 and screwed into the female screw portion 131 at the base of the lug screw 125. As a result, the lag screw 125 and consequently the bone head 103 are pulled toward the femur 101 side. Then, pressure is applied to the fractured part A. Thereafter, the whole is fixed by screwing a plurality of coating screws 137 from the outside of the tube plate 105 to the femur 101 through the fixing screw hole 109.

The conventional configuration has the following problems.
First, when the tube 113 is attached to the tube plate 105, the plate 115 of the tube 113 is inserted into the engagement recess 110 of the tube plate 105, but the plate 115 of the tube 113 is inserted into the engagement recess 110 of the tube plate 105. Once inserted into the plate, the plate 115 may move slightly in the engagement recess 110, and the positional relationship between the tube 113 and the tube plate 105 may fluctuate.
In the conventional case, an extension 151 is provided at the upper end of the tube plate 105 to prevent inadvertent rotation of the lug screw 125 and maintain a firm fixing state, and a fixing screw is inserted into the extension 151. Hole 153 is formed, and the coating screw 155 is screwed together. Therefore, the configuration becomes complicated and the work is complicated.

  The present invention has been made on the basis of the above points, and the purpose of the present invention is to prevent inadvertent fluctuation of the mounting position of the tube with respect to the tube plate, and to complicate the configuration and work. It is an object of the present invention to provide an osteosynthesis device capable of obtaining a configuration in which the inadvertent rotation of the lag screw is restricted without coming.

In order to solve the above problem, an osteosynthesis device according to claim 1 of the present invention is a lug screw that is screwed from one bone side to be joined to the other bone side, and a side surface of the one bone. A tube plate that is disposed along the tube plate, is disposed between the lug screw and the tube plate, and is detachably attached to the tube plate, and has a hollow portion corresponding to the through hole. A tube into which the base portion of the lag screw is inserted, a compression screw that is screwed into the lag screw from the outside of the tube plate through the through hole and the hollow portion, and pulls the lag screw and thus the other bone to one bone side, Position holding means for holding the mounting position of the tube with respect to the tube plate. It is a sign.
According to a second aspect of the present invention, in the osteosynthesis device according to the first aspect, the position holding means includes a through hole drilled at a predetermined position of each of the tube and the tube plate, and the through hole. A position holding pin inserted into the one bone, and by inserting the position holding pin into the one bone through the respective through holes in a state where the tube is attached to the tube plate, The mounting state of the tube with respect to the tube plate is maintained, and the tube plate is temporarily fixed to the one bone.
The osteosynthesis device according to claim 3 is the osteosynthesis device according to claim 2, wherein the lug screw includes a shaft portion having a polygonal cross-sectional shape, and at least a part of the hollow portion of the tube is the The cross-sectional shape is formed in a polygonal shape.
The osteosynthesis device according to claim 4 is the osteosynthesis device according to claim 3, wherein the polygon is a hexagon, and the lag screw is provided with a hexagonal shaft portion, At least a part of the hollow portion of the tube is characterized in that its cross-sectional shape is formed in a hexagon.
The osteosynthesis device according to claim 5 is the osteosynthesis device according to claim 4, wherein the tube plate is provided with another through hole, and another positioning pin is inserted into the one of the one through the through hole. The tube plate is temporarily fixed to the one bone by being inserted into the bone.

As described above in detail, according to the osteosynthesis device according to the present invention, the lug screw that is screwed from one bone side to be joined to the other bone side and the side surface of the one bone are arranged. A tube plate having a through hole, which is disposed between the lug screw and the tube plate and detachably attached to the tube plate, and has a hollow portion corresponding to the through hole, and the lug screw is provided in the hollow portion. A tube into which the base portion is inserted, a compression screw that is screwed into the lag screw from the outside of the tube plate through a through hole and a hollow portion of the tube, and pulls the other bone toward one bone side, and the above Position holding means for holding the mounting position of the tube with respect to the tube plate. Since it is, it is possible to hold the mounted state against the tube plate of the tube by the position retaining means, whereby it is possible to eliminate a variety of defects caused by the positional deviation relative to the tube plates of the tube.
Further, there are various configurations as the position holding means, for example, a through hole drilled in a predetermined position of each of the tube and the tube plate, and a position holding pin inserted into the one bone through the through holes. The position of the tube is attached to the tube plate by inserting the position holding pin into the one bone through the respective through holes in a state where the tube is attached to the tube plate. It is conceivable that the tube plate is configured to be temporarily fixed to the one bone. In that case, the tube can be prevented from being displaced with respect to the tube plate with a simple configuration, and one of the tube plates can be prevented. It can also be temporarily fixed to the bones.
When the lug screw is provided with a shaft portion having a polygonal cross-sectional shape and at least a part of the hollow portion of the tube is formed in a polygonal cross-sectional shape, the lug screw is provided. Inadvertent rotation is restricted, and a stable mounting state can be obtained over a long period of time. At this time, it is not necessary to extend the upper end of the tube plate and screw a separate coating screw as in the prior art, so that the configuration can be simplified and the work can be facilitated.

A polygon is assumed as an example of the polygon.
When the tube plate is configured to be temporarily fixed to the one bone by drilling another through hole in the tube plate and inserting another positioning pin into the one bone through the through hole. In this case, not only the tube is temporarily fixed by the position holding pin for holding the position of the tube with respect to the tube plate, but also the positioning pin is used for temporary fixing, so that stronger temporary fixing is possible.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an exploded perspective view of an osteosynthesis device according to the present embodiment, FIG. 2 is a front view showing the configuration of the osteosynthesis device, and FIG. 3 shows a fracture portion of a femur using the osteosynthesis device. It is a side view which shows a mode that it joins. In the case of this embodiment, as shown in FIG. 3, a fracture occurs in the neck 1a of the femur 1, and an example in which the present invention is applied to an osteosynthesis device for joining the fracture is shown. The fractured part in FIG. Moreover, the code | symbol 3 in FIG. 3 is a bone head.

  First, there is a tube plate 5, and this tube plate 5 is arranged along the side of the femur 1 as shown in FIG. 3. The tube plate 5 includes a through-hole 7 formed in an inclined state on one end side, and another five fixing screw holes 9 from the through-hole 7 toward the other end side at a predetermined pitch. It is equipped with. Further, as shown in FIG. 4C, an engagement recess 10 is provided on the back side of the tube plate 5, and a guide groove 11 is formed on the inner peripheral side portion of the engagement recess 10. . Further, as shown in FIG. 5, the back side of the tube plate 5 is formed in a gentle arc shape along the femur 1.

As shown in FIGS. 1 to 3, a tube 13 is detachably attached to the tube plate 5 having the above configuration. As shown in FIG. 6, the tube 13 includes a plate 15 as an insertion portion, and a cylindrical body 17 integrated with the plate 15 in a vertical direction with a predetermined neck angle (α °). It is composed of The plate 15 includes a stepped portion 16 on the outer periphery thereof. The plate 15 is guided while the stepped portion 16 is inserted into the guide groove 11 provided on the tube plate 5 side, and is attached to and detached from the engaging recess 10.
2 and 3 show a state where the tube 13 is attached to the tube plate 5.

As shown in FIG. 6, a hole 19 is formed in the connecting portion of the plate 15 to the cylinder 17, and another fixed screw hole 21 is formed below the hole 19. . The hole 19 matches the through hole 9 on the tube plate 5 side, and the fixing screw hole 21 matches the fixing screw hole 9 on the tube plate 5 side. Further, the back side of the plate 15 is formed in a gentle arc shape along the femur 1 like the tube plate 5.
Further, a hollow portion 23 is formed in the cylindrical body 17.

A lag screw 25 is inserted into the cylindrical body 17. A male screw portion 27 is formed at the tip of the shaft portion 26 of the lug screw 25. The shaft portion 26 has a hexagonal cross section. The male screw portion 27 has a tap function. Therefore, the outer peripheral portion is formed in a sawtooth shape (a jagged shape), and a notch portion 27a is formed in one circumferential direction. The lug screw 25 is formed with a hollow portion 29. The hollow portion 29 is formed with a female screw portion 31, and the inner peripheral surface on the base end side is a hexagon. The hexagonal part at the tip of the is inserted. The jig is used when the lag screw 25 is screwed to the bone head 3 side. The reason why the outer shape of the shaft portion 26 of the lug screw 25 is hexagonal is to restrict inadvertent rotation of the lug screw 25.

  In FIG. 3, reference numeral 35 denotes a compression screw, and reference numeral 37 denotes a cortical screw as a fixing screw. The cortical screw 37 is screwed into the five fixing screw holes 9, respectively, but only two places are shown in FIG. 1 and only one place in FIG.

Further, as shown in FIGS. 1, 2, 3, 4, and 6, fine through holes 41 and 43 are formed at predetermined positions of the tube plate 5 and the plate 15 of the tube 13 already described. ing. The position holding pin 44 is inserted through the through holes 41 and 43 and driven into the femur 1 to fix the position of the tube 13 relative to the tube plate 5 and temporarily fix the tube plate 5 to the femur 1. Is. Further, another through hole 45 is formed in the lower end portion of the tube plate 5. The tube plate 5 is temporarily fixed to the femur 1 by inserting the positioning pin 46 through the through hole 45 and driving it into the femur 1. That is, the tube plate 5 is temporarily fixed to the femur 1 by the two pins of the position holding pin 44 and the positioning pin 46.

  The operation will be described based on the above configuration. As an example, a case where a fracture occurs in the neck 1a of the femur 1 will be described as an example. First, a hole having a predetermined depth is drilled from the femur 1 to the head 3. Inside the drilled hole, a female thread is applied to the head 3 side. Then, the lag screw 25 is screwed there through the male screw portion 27.

The above operation will be described in detail. First, a tip of a jig (not shown) is inserted into the base of the lug screw 25 to rotate the lug screw 25, thereby screwing it through the male screw portion 27.
The reason why the lug screw 25 itself has a tap function is that when the lug screw 25 is removed after a predetermined curing period has elapsed after joining, the tap function is used to remove the lug screw 25 while performing threading.
Further, since the lug screw 25 itself has a tap function, the screw head may be screwed while performing threading without performing female screw processing on the bone head 3 side in advance.

Next, the tube 13 is attached to the lug screw 25 and the tube plate 5 is disposed along the side of the femur 1, and at this time, the plate 15 of the tube 13 is engaged with the engagement recess of the tube plate 5. 10 is inserted.
Then, the position holding pin 44 is inserted through the through holes 41 and 43 and driven into the femur 1. At the same time, the positioning pin 46 is inserted through the through hole 45 and driven into the femur 1. As a result, the position of the tube 13 relative to the tube plate 5 is maintained, and the tube plate 5 is temporarily fixed to the femur 1.

Next, the compression screw 35 is inserted into the cylindrical body 17 of the tube 13 and screwed into the female screw portion 31 at the base of the lug screw 25. As a result, the lag screw 25 and consequently the head 3 are pulled toward the femur 1 side. Then, pressure is applied to the fractured part A. After that, the whole is fixed by screwing a plurality of cortical screws 37 from the outside of the tube plate 5 to the femur 1 through the fixing screw holes 9. Next, the driven position holding pin 44 and positioning pin 46 are pulled out.
Incidentally, after applying pressure to the fractured part A with the compression screw 35, the weight of the patient acts on the fractured part A, so the compression screw 35 may be removed.

As described above, according to the present embodiment, the following effects can be obtained.
First, when the tube 13 is attached to the tube plate 5, the plate 15 of the tube 13 is inserted into the engagement recess 10 of the tube plate 5. At this time, the femur 1 is inserted through the through holes 41 and 43. Since the position holding pin 44 is driven in to fix the position, inadvertent fluctuation of the mounting position of the tube 13 with respect to the tube plate 15 can be prevented.
Further, the tube plate 5 can be temporarily fixed to the femur 1 by driving the position holding pin 44 into the femur 1.
Further, since the outer shape of the shaft portion 26 of the lag screw 25 is hexagonal, it is possible to prevent the lag screw 25 from rotating carelessly. Therefore, unlike the prior art, it is not necessary to provide an extension portion at the upper end of the tube plate 5, to form a hole for inserting a fixing screw in the extension portion, and to screw the cautical screw. Simplification and ease of work can be achieved.
Further, a through hole 45 is perforated at the lower end of the tube plate 5, and the position of the tube plate 5 can be temporarily fixed by driving a positioning pin 46 into the femur 1 through the through hole. In addition, the tube plate 5 can be temporarily fixed to the femur 1 in combination with the temporary fixing function by the position holding pins 44 described above, and inadvertent fluctuation of the position of the tube plate 5 can be prevented. it can.

The present invention is not limited to the one embodiment.
First, the configuration of the position holding means is not limited to the illustrated configuration, and various configurations are conceivable.
Moreover, it is assumed that the outer shape of the lag screw is a polygon other than a hexagon.
Moreover, in the case of the said one Embodiment, although the fracture of the femur 1 was mentioned as an example and demonstrated, it is not limited to it.
Other configurations shown in the drawings are only examples.

The present invention relates to an osteosynthesis device used for joining fractured parts at the time of a fracture, and in particular, enables the attachment position of a tube to a tube plate to be held and restricts inadvertent rotation of a lug screw. The device devised so that the configuration can be simplified and the work can be facilitated, for example, is suitable for an osteosynthesis device used at the time of fracture of the femur.

It is a figure which shows one embodiment of this invention, and is an exploded perspective view which shows the structure of an osteosynthesis apparatus. It is a figure which shows one embodiment of this invention, and is a front view which shows the structure of an osteosynthesis apparatus. It is a figure which shows one embodiment of this invention, and is a side view which shows a mode that the fracture part of a femur is joined using the osteosynthesis apparatus. FIG. 4A is a plan view of a tube plate, FIG. 4B is a side view of the tube plate, and FIG. 4C is a rear view of the tube plate. 5A and 5B are views showing an embodiment of the present invention, in which FIG. 5A is a view taken along the line aa in FIG. 4B, and FIG. 5B is a view taken along the line bb in FIG. is there. It is a figure which shows one embodiment of this invention, FIG. 6 (a) is a side view of a tube, FIG.6 (b) is a cross-sectional surface of a tube. It is a figure which shows a prior art example, and is a front view which shows the structure of an osteosynthesis apparatus. It is a figure which shows a prior art example, and is a side view which shows a mode that the fracture part of a femur is joined using the osteosynthesis apparatus.

Explanation of symbols

1 Femur 1a Neck of femur 3 Head of head 5 Tube plate 13 Tube 25 Lug screw 26 Hexagonal shaft
35 compression screw 37, 55 coating screw 41 through hole (part of position holding means)
43 Through-hole (part of position holding means)
44 Position holding pin (part of position holding means)
45 Through-hole 46 Locating pin A Broken part

Claims (5)

Lug screw screwed from one bone side to be joined to the other bone side,
A tube plate having a through-hole disposed along the side surface of the one bone,
A tube that is disposed between the lug screw and the tube plate and is detachably attached to the tube plate, and includes a hollow portion corresponding to the through hole, and the base portion of the lug screw is inserted into the hollow portion; ,
A compression screw that is screwed to the lag screw from the outside of the tube plate through the through hole and the hollow portion, and pulls the other bone to one bone side, and
Position holding means for holding the mounting position of the tube with respect to the tube plate;
An osteosynthesis device characterized by comprising: The osteosynthesis device according to claim 1, wherein
The position holding means includes a through hole drilled at a predetermined position of each of the tube and the tube plate, and a position holding pin inserted into the one bone through the through hole. The position holding pin is driven into the one bone through the respective through-holes while being attached to the tube plate, thereby maintaining the attachment state of the tube to the tube plate and attaching the tube plate to the one bone. An osteosynthesis device characterized by being temporarily fixed to the device. The osteosynthesis device according to claim 2,
An osteosynthesis device, wherein the lug screw includes a shaft portion having a polygonal cross-sectional shape, and at least a part of the hollow portion of the tube has a polygonal cross-sectional shape. The osteosynthesis device according to claim 3,
An osteosynthesis device, wherein the lug screw includes a shaft portion having a hexagonal cross-sectional shape, and at least a part of the hollow portion of the tube is formed in a hexagonal cross-sectional shape. The osteosynthesis device according to claim 4,
The tube plate has another through hole, and the tube plate is temporarily fixed to the one bone by driving another positioning pin into the one bone through the through hole. A featured osteosynthesis device.

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