JP3177651B2 - Joints for reduction of tibia etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fitting for reducing distortion such as bending of various bones such as a tibia.

[0002]

2. Description of the Related Art Conventionally, for example, to correct the curvature of the tibia, first, as shown in FIG.
(A) is once cut and separated from the tibia body (b), and then the cut end surface of the tibia body (b) is corrected so that the tibia body (b) abuts on the joint (a) at the correct position. Cutting (c) is performed, and the joint part (a) and the tibia body (b) thus formed are joined to each other at the corrected cutting end face to be joined together, and a method of reducing to a desired state is performed. The joint fitting has a structure in which a flange having a through hole is provided at the base of a rectangular plate-shaped blade having a length penetrating the joint (a). In use, the joint (a) is cut and separated. ) And the tibia body (b) are temporarily fixed with a wire, and then a guide pin is inserted into the joint (a), the chisel is pushed in with the guide pin as a guide, and then the guide pin and the chisel are pulled out. Insert the blade of the above-mentioned fitting into the hole The connecting bolts from the flange of the through-hole of the fitting are screwed into the tibia body (b) joints (a)
And a tibia body (b) are known.

[0003] However, in the above-mentioned conventional metal fittings, the blade is lengthened in order to securely fix the blade to the joint portion, and a small width hole is made with a chisel, and the blade is hammered into the hole. When the blade is driven into the joint, the joint may be damaged such as a crack, and damage to the joint surface is particularly serious.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a fitting for reduction of a tibia or the like, which can perform a safe and reliable connection without damaging a bone with a crack or the like.

[0005]

In order to achieve the above object, the present invention provides a structure in which a flange having a through hole is provided at a base of a plate-like blade and a connection bolt to be screwed into the through hole is provided. The length from the base to the tip of the blade is appropriately shorter than the diameter of the bone into which the blade is to be inserted. A bolus to be inserted into the hole, comprising a blade fixing bolt longer than the diameter of the bone into which the blade is to be inserted, and a female screw member for retaining to be screwed to the blade fixing bolt; A reduction fitting is proposed.

[0006] The above-mentioned "retaining female screw member" in the present invention includes ordinary nuts, double nuts, plates with female threads, and the like. Hereinafter, an embodiment of the present invention will be described with reference to the drawings performed on the fitting for reduction of the tibia.

[0007]

In FIG. 1, a rectangular plate-like flange (2) is connected to the base of a rectangular plate-like blade (1) at right angles in this example, and the blade (1) is separated from its base. The length to the tip is shortened to about one half of that of the blade of the conventional metal fitting, and a through hole (3) for a blade fixing bolt extending from the base to the tip is formed in the center of the plate. The blade fixing bolt (4) to be inserted into the through hole (3) is slightly longer than the diameter of the bone into which the blade (1) is to be inserted, and a washer (6) is provided at the tip having the male screw.
And a nut (5) to be screwed through.

[0008] Through holes (7) and (7) for connecting bolts are provided in portions of the flange (2) protruding from the blade (1), and the through holes (7) and (7) are connected to the connecting bolts (8). ) And (8) are loose holes so that the screwing direction can be changed relatively arbitrarily.

Next, the operation of the above example will be described together with an example in which it is used for reduction of the tibia. Similar to FIG. 4, after the joint part (a) of the tibia is cut and separated from the tibia body (b), the cut surface of the tibia body (b) is corrected and cut, and the corrected cut surface is cut into the joint part (a). The joint part (a) and the tibia main body (b) are temporarily fixed with a wire in a state where the surfaces are aligned. Next, for example, a guide pin is inserted into the joint portion (a), and the guide pin is used as a guide to check whether the cross-sectional dimension is the same as that of the blade (1) by a chisel.
It is slightly smaller and has the same hole length as the blade.

The blade (1) is inserted into the hole, then a bolt (4) for fixing the blade is inserted into the through hole (3), and then the bolt (4) is inserted into the through hole (3) by a screwdriver. Screw into the anterior bone. When the tip of the bolt (4) protrudes from the rear surface of the joint (a), a nut (5) is screwed to the protruding end of the bolt (4) via a washer (6), and the blade (1) Is fixed to the joint (a).

Next, the connecting bolts (8) and (8) are screwed into the tibial body (b) through the through-holes (7) and (7) of the flange (2) through the joint (a), and the joint ( a) and the tibia body (b) are connected. After connection, remove the temporary fixing wire.

FIG. 3 shows one end of a connecting plate (9a) supported on the tip of a blade fixing bolt (4a) and a screw (10a) from the other end of the plate (9a) with a tibial body (b). This is an example in which the connection between the joint part (a) and the tibia main body (b) is reinforced by screwing into the joint.

[0013]

According to the joint fitting for reduction of the tibia or the like of the present invention, the blade is connected to the bone by the blade fixing bolt inserted into the bolt through hole of the blade and the retaining screw member screwed to the blade. Because it is fixed, the length of the blade can be shortened compared to the conventional one, and it is not necessary to drive the blade into the bone tightly, so that the bone into which the blade is inserted does not damage the bone, such as cracks, and is safe. Thus, the bone can be securely reduced and connected.

[Brief description of the drawings]

FIG. 1 is an oblique view of the entire fitting.

FIG. 2 is a partially omitted vertical cross-sectional view in a use state.

FIG. 3 is a sectional view of another embodiment of the present invention;

FIG. 4 is an explanatory diagram of correction cutting of a tibia.

[Explanation of symbols]

 1, 1a blade 2, 2a flange 3, 3a bolt through hole 4, 4a blade fixing bolt 5, 5a nut 7 through hole 8, 8a connecting bolt

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-154946 (JP, A) West German Patent Application Publication 2602900 (DE, A1) French Patent Application Publication 2676353 (FR, A1) French Patent Application Publication No. 2917374 (FR, A1) International Publication No. 91/3985 (WO, A1) U.S. Pat. No. 2,489,870 (US, A) U.S. Pat. No. 5,525,049 (US, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A61B 17/56-17/92

Claims (1)

(57) [Claims] 1. A configuration in which a flange having a through hole is provided at a base of a plate-shaped blade and a connection bolt to be screwed into the through hole is provided, wherein the length from the base to the tip of the blade is set to The blade is provided with a bolt through-hole extending from the base to the end of the blade, and the bolt is to be inserted through the bolt through-hole of the blade. A reduction fitting for a tibia or the like, comprising: a blade fixing bolt longer than a diameter of a bone to be inserted; and a retaining female screw member to be screwed to the blade fixing bolt.