DE7629320U1 - Extraction hook for broken intramedullary nails - Google Patents

Description

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description

For fractures of the thigh, lower leg and upper arm the intramedullary nail comes more and more frequently after Küntscher CKüntscher-Nagel ") to? Application. This one made with a clover leaf profile Nail is driven from the end of the bone into the medullary canal of the long bone. The Küntscher nail is often subject to constant changing loads to fracture within the bone (fatigue fracture). Fig. 2 shows a broken part of the Küntseher nail The removal of the nail parts then presents considerable difficulties. Using a nail catcher (like he also in the textbook for "Practice of intramedullary nailing" by Prof. Dr.G. Küntscher, Friedrich-Karl Schattauer-Verlag Stuttgart 1962, page 288) often does not lead to the desired success, especially with fixed nail pieces, there is a tilting of the Küntscher part nail within of the bone can occur. The result is: Inevitable destruction of healthy soft and bone parts through attachment a bone fenestration; Drilling a new loop, etc. This also results in a significantly longer operating time and thus a correspondingly extended anesthesia for the patient under non-physiological conditions.

The one I invented and which has already been successful in practice Tried and tested knock-out hooks enable perfect removal also from parts of the broken Küntscher nail. Through the arrowhead-like design of the tip of the knockout hook and by creating a centering for the same a coaxial application of force is achieved, tilting does not occur and the Küntscher nail can be removed can be done easily and without problems.

The rash hook has the following appearance: It consists of a circular cylindrical rod, one of which The end is shaped like an arrowhead (Fig. T). The shaft diameter of the rash hook must be slightly smaller than

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the circular one given by the conical part of the Küntscher-NageIs opening (Fig. 2) so that ease of movement is guaranteed and there is some centering. The width of the arrowhead-shaped structure that looks like a double-sided Hook acts is given by the dimensions of the Küntscher nail, in such a way that one side of the hook with cut off the outer edge of the nail slot, the other side easily slide into the opposite groove koiamt (Fig.3a). The arrowhead has two cutting edges that slightly separate the ones that have grown into the Küntseher nail Soft tissues as well as the internal bone substance enable (Fig. 1). The design of the handle can be in the already proven form of the pull-out hook for KÜntscher-Na & el.

Puncture method: The knock-out hook must be inserted into the interior of the Küntseher nail until the arrowhead-shaped structure emerges from the conical Küntscher nail end (insertion position see Fig. 3a). Then the Aus-2Cill £ "-2liS2 t» m Qrt ^ü ^ Sill ^ Slltr - Λε »" Ηοί lrr »mrnor» νιοήΛβ TJalrcm er »<3β2 * circular opening of the Küntscher nail to support (Fig. The Küntscher nail can now be pulled or knocked out of the medullary cavity of the long bone.

7629328 24.9177

Claims (2)

S chut ζ ans pr üche on: 1. Knock-out hook for Küntscher-Nagel, which is an arrowhead-shaped Form as a force distribution structure, so that a double-sided force distribution in contrast to one-sided acting hook is achieved (Fig "1). 2. Protection claim according to 1., but also arrowhead as Cutting designed for a better separation of the throats Soft tissues and internal bone substance. 762932Θ 240177