MXPA98001534A - Auxiliary of osteosinte - Google Patents

Abstract

The invention relates to an osteosynthesis aid for the fixation of bone segments with fixation frames, formed as several pieces, which consist respectively of a base and a profiled suction piece, which can be secured to each other, a disc being provided buttress arranged between the base and the clamping piece, with fixing reception spaces, aligned with the profiles of the clamping piece

Description

AUXILIARY OF OSTEOSINTHESIS The invention relates to an osteosynthesis assistant according to the generic term of the main claim. EP 298 100 discloses an osteosynthesis aid for the fixation of curved or bent bones, which is equipped with two holding discs respectively carrying fasteners, which are joined together by a lockable joint, the fasteners being like screws or nails or similar, in each clamping disk, lockable and displaceable in its longitudinal axis and in its height. The planned joint is designed as a double-sphere joint, the two spherical heads of which are connected to each other by a fixed distance piece and the fasteners are respectively rotatably and fixably arranged in the rotated position on each clamping disk, in a plane, to which the longitudinal axis of the respective clamping disk runs parallel. The procedure is carried out in such a way that the fasteners used to fix the fasteners are formed by two pieces. In a sector block, a clamping screw is fixed by a clamping piece, a surface formed in a flat and even manner on the contact surfaces touching each other being of these two components, while on the other surface they are connected to the other surface. provided reception spaces for fasteners. By means of this arrangement it is possible to fix the fasteners in a displaced manner, both on their longitudinal axis and transversely thereto. In the initial position of the two components, namely the sector plug and the clamping piece, both opposing surfaces are completely in contact with each other. In the displaced position of the fasteners, this full contact is no longer retained, so that the fasteners are not fixed in their largest possible area. Therefore, in the case of forces of transverse effect, cracks may appear here. The invention is based on the objective of starting from the auxiliaries known from the state of the art, so that in the displaced position of the fasteners, the largest possible area of fasteners between the parts of the fastening discs is fixed. that coact each other This objective on which the invention is based is solved with the teaching of the main claim. Advantageous embodiments of the novelty are illustrated in the subclaims. Expressed in other words, it is proposed that between both components belonging to the state of the art, namely sector block and clamping piece, a buttress disc be incorporated, which can be moved with the clamping piece to the displaced position of the fixators. In this way it is achieved that also in the displaced position of the fasteners these are completely covered by the plane of the clamping piece and that the counterfoil disc, on the reverse, also receives the full coverage. If, as the novelty also proposes, the buttress disk is equipped on its back with projections, which coact with recesses in the upper side of the base, a good guide and adjustment of the support of the counterfoil is achieved. It is also proposed that the guides for the projections on the buttress disk and the recesses in the base are shaped in a rounded manner, so that a slight rotation of the components between themselves is possible. An example of embodiment of the invention is illustrated below with the help of the drawings. These show: Figure 1, a fixator according to the state of the art. Figure 2, a fixator according to the novelty. Figure 3, on an enlarged scale, the holding stand according to the novelty. Figure 4, a top view according to section line 4-4 in figure 3. And figure 5, in a disassembled representation, the components of the novelty. In FIG. 1, a clamping disc is shown in 14, on which it is movably arranged and fixable in the direction of the arrows Fi, a holding stand 15. In the state of the art, the holding stand 15 is composed of a base 1 and a holding part 3, being arranged between these two fixing components 16 and 17. So that these can also be moved. in the direction of the arrow F, the holding part 3 is provided with recesses, but the base 1 is smooth on its surface. The above leads to that, as shown in Figure 11, in a displaced position of the fasteners 16 and 17, these are no longer fixed on the entire surface by the base 1 and the clamping piece 3. To assist the above, a new construction of the clamping stand is proposed, as shown in figures 3 to 5. Also here, the base bears the number 1 and the clamping piece the 3, a buttress disk 2 is provided between the two components. As in the prior art, the holding part 3 has recesses 6 and 7, which are adjusted to the shape of the fasteners 16 and 17, and also the buttress disc 2 provided with this type of recesses 4 and 5. On the back of the counter buttress 2 are provided projections 8 and 9, which are introduced into the recesses 10 and 11 provided in the base 1, these projections 8 and 9 and the recesses 10 and 11 are concentrically configured around a clamping screw 12 rounded, of so that a rotation of the buttress disk 2 with respect to the base 1 is possible. In this way, now also in the displaced position of the fasteners 16 and 17, these are covered over their entire surface on both sides, on the one hand by the clamping part 3, on the other by the buttress disc 2, so that in case of loads transverse to the longitudinal axis of the clamps 16 and 17, these are sufficiently supported. Also the projections 8 and 9 and the recesses 10 and 11 contribute to this transverse resistance.

Claims (3)

NOVELTY OF THE INVENTION Having described the foregoing invention, the content of the following is claimed as property: CLAIMS

1. An osteosynthesis aid for the fixation of bone segments with fixed clamping stands with fasteners, formed in several pieces, composed respectively of a base and a profiled clamping piece, which can be secured to each other, characterized by a counter disc arranged between the base and the clamping piece, with reception spaces for the fasteners aligned to the profiles of the clamping piece.

2. An osteosynthesis aid according to claim 1, characterized in that the buttress disc, on its opposite side to the reception spaces, is equipped with projections, which coact with the recesses in the upper side of the base. An osteosynthesis assistant according to claim 1 or 2, characterized in that the projections and the recesses are arranged rounded, concentrically around a clamping screw that joins and holds the base, the clamping part and the counter disc. SUMMARY The invention relates to an osteosynthesis aid for the fixation of bone segments with fixation frames, formed as several pieces, which consist respectively of a base and a profile shaped piece, which can be secured to each other, being a buttress disk disposed between the base and the clamping piece is provided, with fixing reception spaces, aligned with the profiles of the clamping piece.