JP2015167779A - Fracture treatment plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problems of conventional plates such as a stubborn integral junction state between the plate and the bone, which inhibits the function of blood vessels and cells on the bone surface to possibly cause necrosis of the bone, as well as which may inhibit a normal treatment of a fractured portion as an external pressure applied to the bone is not transmitted to the fractured portion as a stress.SOLUTION: A fracture treatment plate includes a plate body 1 in a thin long plate shape having a plurality of attachment holes 2 to be screwed to the bone in the longer direction. The fracture treatment plate also comprises a thin plate part 4 formed in an intermediate plate part 3 that extends between the attachment holes 2.

Description

  The present invention relates to a fracture treatment plate.

  When joining a fractured bone with a fracture treatment plate, the plate is placed so as to straddle the fractured site along the bone, and the plate is fixed to the bone with a plurality of fixing screws. The plate has a plurality of mounting holes, and a fixing screw is screwed into the bone through the mounting hole to fix the plate to the bone.

  For example, Patent Document 1 discloses a fracture treatment plate of this type. FIG. 4 of Patent Document 1 shows a plate whose cross section is warped along the longitudinal direction. When fixing such a plate to a bone fracture site with a fixing screw as shown in FIG. 1 of Patent Document 1, both ends of the arch shape are firmly attached to the side of the bone in a straight line in the longitudinal direction. Thus, the plate does not bend and bend, and the bone and the plate are firmly joined.

  In addition, as described in the conclusion of Non-Patent Document 1, it has been conventionally known that it is effective to apply a stress composed of an appropriate compressive load and a tensile load for the treatment of bone formation at a fracture site. Yes.

JP 2010-119638 A

Kanazawa University Journal of Encyclopedia of Medicine, 104 (6): 668-670 1995-12-01 "Experimental study and theorization of bone formation and mechanical stimulation" Kazuhiro Aoyama

  However, in the conventional tightly bonded state between the bone and the plate body, the external force applied during walking training or the like concentrates on the fixing screw and the mounting hole for fixing the plate to the bone, so that the screw of the fixing screw to the bone with time changes. There was a risk of loosening. Not only that, but a strong integral connection between the plate and the bone can inhibit the blood vessels and cells on the bone surface and cause bone necrosis. Therefore, there is a risk that normal treatment of the fracture site may be hindered.

  Accordingly, the present invention provides an elongated plate-shaped plate body having a plurality of attachment holes to be screwed to a bone in the longitudinal direction, as defined in claim 1 of the invention. The present invention is intended to provide a fracture treatment plate in which a thin plate portion is formed in an intermediate plate portion therebetween.

  Moreover, this invention tries to provide the plate for fracture treatment of Claim 1 which forms a thin plate part in the intermediate | middle plate part between at least 2 attachment holes as described in Claim 2. To do.

  Further, according to the present invention, as described in claim 3, a concave shape portion is formed as a thin plate portion on the plate surface side in contact with the bone so that the thin plate portion does not contact with the bone. It is intended to provide a fracture treatment plate as described in 1. above.

  Further, according to the present invention, as described in claim 4, the intermediate plate part excluding the protrusion part is formed as a thin plate part by providing a protrusion part around the mounting hole. It is intended to provide a fracture treatment plate as described in 1. above.

  According to the fracture treatment plate according to the present invention, as described in claim 1 of the claim, in the elongated plate-shaped plate body having a plurality of mounting holes to be screwed to the bone in the longitudinal direction, By having a configuration in which a thin plate portion is formed in the intermediate plate portion between the mounting holes, when a force is applied to the plate fixed to the bone by a plurality of mounting holes, the middle of the mounting hole Since the thin plate portion provided in the plate portion is bent and elastically maintains the plate, the joint between the bone and the mounting hole is maintained elastically and strongly through the fixing screw, and the jointed plate can be compressed into the bone. There is an effect that the stress including the tensile load is reliably transmitted, and the healing effect of the fractured portion subjected to the stimulation is enhanced.

  Moreover, according to this invention of Claim 2, it has a structure formed by forming a thin plate part in the middle of at least two attachment holes, so that the attachment hole spans the fracture site between the thin plate parts. Can be fixed to the bone.

  Moreover, according to this invention of Claim 3, it has a structure which forms a concave shape part as a thin plate part on the plate surface side which contacts a bone so that a thin plate part may not contact with a bone. Since the area of the plate surface in contact with the bone can be reduced by only the thin plate portion, the degree of freedom of elastic deformation of the plate surface and the bone can be ensured and the bone necrosis can be prevented.

  Further, according to the present invention as set forth in claim 4, by providing a protrusion around the mounting hole, the intermediate plate portion excluding the protrusion is formed as a thin plate portion. Most of the plate surface excluding the protrusions can be kept away from the bone, and the plate body consisting mostly of a thin plate part can be elastically maintained, and bone necrosis can be maintained. There is an effect that can be prevented in most of the main body.

The top view of Example 1 of this invention. The bottom view of Example 1 of this invention. The right view of Example 1 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a longitudinal central sectional view of a first embodiment of the present invention. The front side perspective view of Example 1 of this invention. The back side perspective view of Example 1 of the present invention. The schematic bottom view of the principal part of Example 2 of this invention. The schematic bottom view of the principal part of Example 2 of this invention. The schematic bottom view of the principal part of Example 2 of this invention. FIG. 6 is a schematic cross-sectional shape diagram of the main part of Example 3 of the present invention. FIG. 6 is a schematic cross-sectional shape diagram of the main part of Example 4 of the present invention.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

  In Example 1 shown in FIGS. 1 to 6, reference numeral 1 denotes an elongated plate-shaped plate body having a plurality of mounting holes 2 to be screwed to a bone in the longitudinal direction. Then, it is made of stainless steel. In the case of the first embodiment, the intermediate plate portion 3 between the adjacent mounting holes 2 of the plate body 1 is formed with a thin plate portion 4 on the front and back sides.

  On the back side to be joined to the bone of the plate main body 1, a ring-shaped joining projection 5 is provided on the outer periphery of the mounting hole 2, and the intermediate plate 3 excluding the joining projection is formed as a thin plate 4. ing. In this case, on the back side of the plate main body 1, the ring-shaped joint protrusion 5 on the outer periphery of the mounting hole 2 becomes a component part of the plate thickness of the plate main body 1, and the intermediate plate portion 3 excluding the joint protrusion 5 remains directly on the bone Is a thin plate portion 4 that is not joined.

Further, on the front side of the plate body 1 that is not joined to the bone, a recessed shape portion 6 is provided across the intermediate plate portion 3 between the adjacent mounting holes 2, and this recessed shape portion 6 is provided in the middle of the plate body 1. A thin plate portion 4 according to the present invention for reducing the plate thickness of the plate portion 3 is formed.
Thus, the thin plate portion 4 provided in the intermediate plate portion 3 between the attachment hole 2 and the attachment hole 2 fixed to the bone with the fixing screw bends when the force is applied to the plate main body 1 to deform the plate main body 1. Since it is maintained elastically, the connection between the bone and the mounting hole is maintained elastically and robustly through the fixing screw, and stress including compression or tensile load is reliably transmitted from the bonded plate body 1 to the bone. Thus, the healing effect of the fractured part that has been stimulated is enhanced.

The mounting hole 2 includes an upper hole 2a and a lower hole 2b having substantially the same depth, and the upper hole 2a that fits the head of the fixing screw has a larger diameter than the lower hole 2b that fits the screw shaft portion. Have.
Further, the width of the thin plate portion 4 of the intermediate plate portion 3 is set to the width of the upper hole 2a of the attachment hole 2 on both side surfaces not joined to the bone of the intermediate plate portion 3 between the adjacent mounting holes 2 of the plate body 1. A constricted portion 7 that is narrowed to substantially the same width is provided, and the force from the screw head of the fixing screw is relatively relatively entirely provided in the thin plate portion 4 provided with the constricted portion 7 through the upper hole 2a having the substantially same width. It is constituted so that it can be added without bias.

  The second embodiment has a configuration in which the bonding projection 5 is provided on the outer periphery of the mounting hole 2 on the back side to be bonded to the bone of the plate body 1 in the first embodiment, and the intermediate plate portion 3 excluding the bonding projection 5 is provided. The thin plate portion 4 is configured as it is. The form of the joint protrusion 5 is not limited to the ring shape in the first embodiment, but has a number of bead shapes as shown in FIG. 7, the intermittent ring shape as shown in FIG. 8, and the mounting hole as shown in FIG. There is a rod-shaped object facing the center.

  Although omitted in the figure, in FIG. 7, FIG. 8, or FIG. 9, a plurality of joining projections 5 having two or more joining projections 5 provided at appropriate intervals including equal intervals, or joining projections 5 Are provided in an intermittent shape, and are arranged in a radial shape and in a petal shape, and a ring shape includes a geometric shape such as a star shape or a continuous small arc shape.

  In the third embodiment, as shown in FIG. 10, a recessed shape portion 8 is provided across the intermediate plate portion 3 between the adjacent mounting holes 2 on the back side joined to the bone of the plate body 1. . By providing the recessed shape portion 8, the thin plate portion 4 can be formed on the intermediate plate portion 3. The contact surface with the bone can be reduced.

  In the illustrated third embodiment, the recessed shape portion 8 is provided on the same intermediate plate portion 3 as the recessed shape portion 6 provided on the front side of the first embodiment. However, the recessed shape portion 8 may be provided alone or a plurality may be provided as appropriate. It is. In addition, the arrangement of the concave shape portion 8 and the concave shape portion 6 can be provided so that they do not overlap at the same position or at all, as shown in FIG. It can be provided as appropriate.

  In the fourth embodiment, the concave shape portion 6 provided on the front side of the first embodiment and the concave shape portion 8 on the back side of the third embodiment are semicircular grooves, but various other concave shapes are used. Is shown. (A) described in FIG. 11 is a narrow trapezoidal shape, (b) is a V-shape, and (c) is a rectangular concave shape. In addition, combinations of various concave shapes such as a U-shape are conceivable. The groove width and depth of the recessed shape can be set as appropriate.

DESCRIPTION OF SYMBOLS 1 Plate body 2 Mounting hole 3 Intermediate plate part 4 Thin plate part 5 Joint protrusion part 6 Recessed shape part 7 Constricted part 8 Recessed shape part

Claims (4)

  A plate for fracture treatment in which a thin plate portion is formed in an intermediate plate portion between the attachment hole and the attachment hole in an elongated plate-shaped plate body having a plurality of attachment holes to be screwed to the bone in the longitudinal direction.   The fracture treatment plate according to claim 1, wherein a thin plate portion is formed in an intermediate plate portion between at least two mounting holes.   The fracture treatment plate according to claim 1 or 2, wherein a concave shape portion is provided as a thin plate portion on a plate surface side in contact with the bone so that the thin plate portion does not contact with the bone.   The fracture treatment plate according to claim 1, 2, or 3, wherein an intermediate plate portion excluding the joint projection portion is formed as a thin plate portion by providing a joint projection portion around the attachment hole.

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