JP3242516U - bone fixation plate - Google Patents

Abstract

A bone fixation plate is provided which can be easily applied to bones of different sizes and can be reliably fixed to the bone. A bone fixation plate (A) comprises a trunk body (1) made of a fiber-reinforced resin and having a substantially plate-like shape elongated vertically, and a fiber-reinforced resin that extends angularly from both edges of the longitudinal ends of the trunk body (1) to the extension side. and an arcuate square body 2 made of The trunk body 1 has a laterally extending first groove 12 on its front side, and the substantially annular body 2 has a substantially longitudinally extending second groove 22 near its outer peripheral edge. [Selection drawing] Fig. 1

Description

The present invention relates to a bone fixation plate for fixing a fracture site, particularly a fracture site of a long bone such as a femur.

Conventionally, an instrument called a bone plate or the like is used to fix a fracture site of a long bone such as a femur. As such bone plates, those disclosed in Patent Documents 1 to 3, for example, are known. All of the bone plates disclosed in these publications have a metal plate-like member that is placed along the bone, and this plate-like member is fixed to the bone with screws or the like.

JP-A-11-076259 JP 2010-259823 A International publication 2015/146866 pamphlet

When the bone plate described above is used, the plate-like member is fixed to the bone with screws or the like, so that the plate-like member and the bone are firmly fixed. However, in the conventional bone plate, since the plate-like member is made of metal and molded to a predetermined size, it may be difficult to match the size of the bone to be fixed. In addition, such a fixing method requires a hole in the bone, which increases the burden on the human body. In addition, it is necessary to select an attachment position that does not interfere with the gluteus medius, which mainly controls the abduction of the hip joint via the greater trochanter. It is not easy to take care not to do so.

The present invention has been made in view of the above problems, and its object is to easily adapt to the bone to which it is applied and to securely fix it to the bone even if the size and shape are different for each person. To provide a bone fixation plate capable of

INDUSTRIAL APPLICABILITY The present invention is applied to a bone fixation plate that is laid along a long bone and fixed to the bone to repair the damaged bone. Referring to FIG. 1, it consists of a substantially plate-like trunk body 1 extending in the longitudinal direction and made of fiber-reinforced resin, and a fiber-reinforced fiber-reinforced resin body extending angularly from both ends of the trunk body 1 in the longitudinal direction to the extension side. and an arcuate square body 2 made of resin. The trunk 1 has a laterally extending first groove 12 on its front side, and the arc-shaped rectangular body 2 has a substantially longitudinally extending second groove 22 near its outer peripheral edge.

The trunk 1 has a plurality of first projections 11 projecting forward on its front side, and the first grooves 12 are formed between the adjacent first projections 11,
The arcuate square body 2 has a plurality of second protrusions 21 protruding outward near its outer periphery, and the second grooves 22 are formed between adjacent second protrusions 21 .

The trunk body 1 has a generally arcuate ventral surface recessed at the center as viewed in the longitudinal direction.

The back side of the arcuate square body 2 is provided with an inclined surface 2d with a larger horizontal distance than the front side.

A fan-shaped portion 3 projecting downward and rearward is provided at the tip portion of the arc-shaped square body 2 .

According to the present invention, since the bone fixation plate includes the trunk body and the arc-shaped horn body connected to the trunk body, a long bone having a spherical portion (the greater trochanter to which the gluteus medius is connected) like the femur. , the bone fixation plate can easily follow the bone by locating the arcuate horn on the spherical portion. Of course, it can be arranged between the opposing arcuate horn bodies without interfering with (damaging) the gluteus medius, and the attachment of the bone fixation plate is facilitated.

In addition, since grooves are formed in the front surface of the trunk and near the outer periphery of the arc-shaped horn, the fixation band wrapped around the bone is passed through these grooves and lashed, thereby fixing the bone to the bone. The plate can be securely fixed. In addition, since this bone fixation plate is made of fiber-reinforced resin and the distal end portion of the arc-shaped angular body is discontinuous, the angular body can be deformed independently of each other at the two sites, so that the fixation band can be secured. It is slightly deformed by lashing and can easily conform to bones, and can be easily fitted to bones of different sizes for each individual. Unintended rotation deviation can also be suppressed. In addition, it is possible to reduce the pressure pain caused by the bone fixation plate even in a lying position.

A first protrusion is provided on the front side of the trunk body 1, a first groove is formed between the adjacent first protrusions, and the arc-shaped square body is provided with a second protrusion near its outer peripheral edge. Since the two grooves are formed between the adjacent second projections, the grooves can be formed without reducing the strength of the bone fixation plate, and each groove should be formed between the projections. will be able to

Since the trunk body has a generally arcuate shape in which the ventral surface is concave at the center when viewed in the longitudinal direction, it is easy to round the ventral surface of the trunk body, that is, the surface facing the bone. becomes easier to follow the bone.

If the rear side of the arc-shaped angular body is provided with an inclined surface that is laterally larger than the front side, even if the circular body is approximately spherical like the greater trochanter of the femur to which the arc-shaped angular body is fixed. , the back surface of the arc-shaped angular body, that is, the surface on the side facing the bone, easily conforms to the bone.

If a fang-shaped portion is provided at the distal end portion of the arc-shaped angular body, the bone fixing plate can be temporarily fixed by hooking the fang-shaped portion in a hole formed in the bone. Therefore, the bone fixation plate is less likely to shift when lashing with the fixation band.

1 is a perspective view from the front side of a bone fixation plate; FIG. FIG. 3 is a perspective view from the rear side of the bone fixation plate; 1 is a perspective view of a femur and a bone fixation plate fixed near its proximal portion; FIG. It is a perspective view from the back side of the bone fixation plate created by computer graphics. It is a front view of the bone fixation plate created by computer graphics. It is a rear view of the bone fixation plate created by computer graphics. It is a left side view of the bone fixation plate created by computer graphics. It is a right side view of the bone fixation plate created by computer graphics. FIG. 2 is a plan view of a bone fixation plate created by computer graphics; It is a bottom view of the bone fixation plate created by computer graphics.

An embodiment of a bone fixation plate according to the present invention will be described below with reference to the drawings. 1 and 2 are perspective views of the bone fixation plate A viewed from the back side (hereinafter referred to as the front side in the drawings) and ventral side (hereinafter referred to as the back side in the drawings), respectively. FIG. 3 is a perspective view showing a state in which the bone fixing plate A is fixed to the femur B as a long bone. 4 to 10 are a perspective view and a six-sided view of the bone fixation plate A created by computer graphics. The shading in FIGS. 4 to 10 is due to the shape of the bone fixation plate A. FIG. The vertical direction in the following description means the vertical direction in the posture of FIG. 5, and the front/rear or front/rear means the front/back direction of the paper surface in FIG. Moreover, the width direction means the left-right direction in the attitude shown in FIG.

In this embodiment, a case where the bone fixing plate A is used for the femur B will be described. Therefore, before explaining the bone fixation plate A, the proximal portion of the femur B to which the bone fixation plate A is used will be explained. As shown in FIG. 3, the femur B has a generally bar-shaped femoral body b1, which occupies most of the area from the base of the leg to the knee, and a femoral neck b2, femoral head b3, and greater trochanter at its proximal portion. b4, with the lesser trochanter. The femoral head b3 is a portion that fits into an acetabulum (not shown) of the pelvis. The femoral body b1 and the femoral head b3 are connected via a femoral neck b2 that is slightly constricted so as to provide a large range of motion. The femoral neck b2 extends in a slightly inclined direction from the axial direction of the femoral body b1. The greater trochanter b4 is formed in the vicinity of the root-side end of the femoral body b1, substantially opposite to the femoral neck b2. The abductor muscle of the hip joint such as the gluteus medius muscle is attached to the greater trochanter b4. In this embodiment, a case where the proximal portion of the femur B, particularly the proximal portion of the femoral body b1 is fractured, and the bone fixation plate A is used to fix the fractured portion will be described.

As shown in FIGS. 1 and 2, a bone fixation plate A according to the present invention is made of fiber-reinforced resin and includes a trunk body 1 and a pair of arcuate square bodies 2. As shown in FIGS. The trunk 1 has a vertically long substantially rectangular shape when viewed from the front, that is, a substantially plate-like portion that is substantially rectangular in the vertical direction. However, as shown in FIG. 10, the front surface of the trunk 1 is not flat, but has an arcuate shape in which the central portion is higher when viewed in the longitudinal direction.
On the other hand, the rear surface of the trunk 1 has an arcuate shape in which the central portion is recessed as viewed in the longitudinal direction. By forming the trunk body 1 into such a shape, the trunk body 1 can easily follow the long bones when the trunk body 1 and the long bones are combined.

Since the trunk 1 is a portion to be fixed to the fracture site, if the length in the longitudinal direction of the trunk 1 is too short relative to the length of the femoral body b1, the fracture site cannot be sufficiently fixed. On the other hand, if the longitudinal direction of the trunk 1 is too long, the range of incision will be widened and the burden on the patient will be increased. Therefore, it is preferable that the length of the trunk body 1 in the longitudinal direction can sufficiently fix the fracture site and be as short as possible. On the other hand, the width of the trunk 1 (the lateral length in the posture of FIG. 5) is equal to or slightly smaller than the diameter of the femoral body b1.

The arc-shaped angular body 2 is in the shape of a gentle circular arc, and its lower end is connected to the upper end of the trunk body 1 . Specifically, the pair of arcuate prisms 2 are substantially symmetrical. The width of the arcuate square body 2 is smaller than the width of the trunk body 1. - 特許庁Therefore, the arc-shaped square body 2 is more easily deformed than the trunk body 1. - 特許庁

The surface of the arcuate prism 2 is composed of an upper flat surface 2a, an upper inclined surface 2b, a lower flat surface 2c and a lower inclined surface 2d. As shown in FIGS. 5 and 6, the front side surface is mainly composed of an upper flat surface 2a and an upper inclined surface 2b, and the rear side surface is mainly composed of a lower flat surface 2c and a lower inclined surface 2d.

The upper flat surface 2a has a wide, substantially semi-elliptical shape, and a wide, substantially semi-elliptical upper inclined surface 2b is formed along the outer edge thereof. The upper inclined surface 2b is inclined downward toward the outside. A lower flat surface 2c is formed inward from the rear end of the upper inclined surface 2b. A lower inclined surface 2d is formed along the inner edge of the lower flat surface 2c and the inner edge of the upper flat surface 2a. The lower inclined surface 2d is inclined downward toward the outside. Due to such a shape, the distance in the width direction (horizontal direction) between the pair of arc-shaped prisms 2 at the same vertical position is greater on the rear side than on the front side. 6, the distance D1 between the inner edges of the upper flat surface 2a, which is the most forward side, is smaller than the distance D2 between the inner edges of the lower flat surface 2c, which is the most rearward side. This makes it easy for the substantially torus to conform to the bone. That is, the arcuate angular body 2 is smoothed over the greater trochanter b4. Further, as shown in FIGS. 7 and 8, the upper flat surface 2a is not parallel to the longitudinal direction of the trunk 1, but slightly inclined. Specifically, the arcuate square body 2 is inclined so that the upper end side thereof faces the rear side.

In this embodiment, the upper inclined surface 2b does not have a flat inclination, but has a generally arcuate shape that protrudes forward in a cross section perpendicular to the circumferential direction. In addition, the lower inclined surface 2d is not flat, but has a generally arcuate shape that is concave forward in a cross section perpendicular to the circumferential direction. With such a shape, the arcuate angular body 2 can easily follow the substantially spherical greater trochanter b4. In addition, since a gap is formed between the front ends of the pair of arc-shaped square bodies 2, each of the pair of arc-shaped square bodies 2 can be independently bent or twisted. easier to follow.

In the vicinity of the distal end of the lower inclined surface 2d of each arcuate square body 2, there is formed a substantially conical fang-shaped portion 3 protruding rearward and downward.

A plurality of projections 11 (corresponding to first projections in the present invention) projecting forward along the longitudinal direction are formed on the front surface of the trunk 1 at substantially the center in the width direction. The plurality of protrusions 11 are arranged in pairs so that a gap is formed between them. In other words, grooves 12 (corresponding to first grooves in the present invention) in the width direction (horizontal direction) are formed between each pair of protrusions 11 .

On the other hand, the upper inclined surface 2b of each arcuate square body 2 is formed with a plurality of protrusions 21 (corresponding to the second protrusions in the present invention) protruding outward along a substantially circumference. The plurality of protrusions 21 are also arranged in pairs so that a gap is formed between them. In other words, grooves 22 (corresponding to second grooves in the present invention) are formed in the front-rear direction between each pair of protrusions 21 .

Next, how to use the bone fixation plate A will be described. As described above, in this embodiment, the proximal portion of the femoral body b1 of the femur B is fractured, and the bone fixation plate A is used to fix the fracture.

First, an incision is made about 15 cm distally from the vicinity of the greater trochanter b4 on the outside of the thigh, and the fascia lata is also incised. This exposes the outer side of the proximal portion of the femur B including the greater trochanter b4. Next, the proximal portion of the vastus lateralis muscle to which the bone fixation plate A is to be attached is exfoliated under the periosteum. Then, a position at which the bone fixation plate A is well suited is searched for at that site, and that position is determined as the mounting position.

After determining the mounting position of the bone fixing plate A, a hole is formed in the femur B corresponding to the fang-shaped part 3 at the mounting position, and the fang-shaped part 3 is hooked in the hole. Thereby, provisional positioning of the bone fixation plate A can be performed. Then, as shown in FIG. 3, a fixation band C is wrapped around the femur B, and the femur B and the bone fixation plate A are lashed. As the fixing band C, a Nespron (registered trademark) cable or the like made of resin can be used. At this time, the fixing band C is passed through the grooves 12 (see FIG. 1) between the protrusions 11 and the grooves 22 (see FIGS. 1 and 2) between the protrusions 21. As shown in FIG. This makes it difficult for the fixing band C to shift. Further, when the fixation band C is used for binding, force acts on the bone fixation plate A toward the femur B side. Since the bone fixation plate A is made of fiber-reinforced resin, deformation along the femur B occurs due to this force. Therefore, this bone fixation plate A can be easily applied even if the shape, size, etc. of bones differ due to individual differences. X-ray transparency can also be ensured.

When the fracture is healed, the thigh is incised again, the fixation band C is removed, and the bone fixation plate A is taken out and sutured.

As described above, the bone fixation plate according to the present invention can be deformed according to the shape and size of the bone to which it is applied, and can be securely attached to the bone by a fixation band such as a Nespron cable. can be fixed to More specifically, by positioning the arcuate horn on the spherical portion, the bone fixation plate can easily follow the bone. Of course, it can be arranged between the opposing arcuate horn bodies without interfering with (damaging) the gluteus medius, and the attachment of the bone fixation plate is facilitated. This bone fixation plate is made of fiber-reinforced resin, and since the tip of the arc-shaped horn is discontinuous, the two parts can be deformed independently of each other. Due to this, it deforms to some extent and easily conforms to the bone, and can be easily fitted to bones of different sizes for each individual. In addition, pressure pain due to the bone fixation plate hook can be reduced even in a lying state. A bone plate made of fiber-reinforced resin is lighter than a metal one, and it goes without saying that the burden on the wearer can be reduced.

[Another embodiment]
(1) The trunk body 1 may be formed with a through hole in the front-rear direction. The bone fixation plate A can be temporarily fixed to the long bone B by passing screws through such through holes. In this case, the fang-shaped portion 3 may not necessarily be provided.

(2) In the above-described embodiment, the grooves 12 and 22 are formed by providing the protrusions 11 and 21. In some cases, it is permissible to form

INDUSTRIAL APPLICABILITY The present invention can be used to fix a fracture site of a long bone such as a femur.

A: bone fixation plate, 1: trunk body, 11: convex portion (first convex portion), 12: groove (first groove), 2: arc-shaped angular body, 2d: downward slope. 21: convex portion (second convex portion), 22: groove (second groove), 3: fang-shaped portion, C: fixing belt (cable).

Claims (5)

A bone fixation plate that is aligned along a long bone and fixed to the bone to repair the damaged bone, comprising a substantially plate-shaped fiber-reinforced resin trunk extending in the longitudinal direction, and the longitudinal ends of the trunk. and an arc-shaped rectangular body made of fiber-reinforced resin extending angularly from both edge portions to the extension side,
A bone fixation plate, wherein the trunk has a first laterally extending groove on its front side, and the arcuate rectangular body has a second substantially longitudinally extending groove near its outer peripheral edge. The trunk has a plurality of first protrusions protruding forward on its front side, and the first grooves are formed between adjacent first protrusions,
2. The arc-shaped rectangular body according to claim 1, wherein the arc-shaped rectangular body has a plurality of second protrusions protruding substantially outward near its outer periphery, and the second grooves are formed between adjacent second protrusions. bone fixation plate. 3. The bone fixation plate according to claim 1, wherein the trunk body has a substantially arcuate ventral surface recessed at the center as viewed in the longitudinal direction. 4. The bone fixation plate according to any one of claims 1 to 3, wherein the rear side of the arcuate prism is provided with an inclined surface that is laterally larger than the front side. 5. The bone fixation plate according to any one of claims 1 to 4, wherein the distal end portion of the arc-shaped angular body is provided with a tooth-shaped portion projecting downward and rearward.

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