Implantable bone screw with threaded shank

The screw comprises a drive head (10) and a threaded shank (3), the joint between which shears at an effort below that which leads to the shank breaking. The head connects with the shank through a polygonal-section rod (12) which can be inserted and withdrawn from a hole (7) of similar cross-section...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	FURNO PATRICK, DEMESY MICHEL, BARBA LAURENT, LALLEMENT JEAN JACQUES, HUMMER JACQUES, BERTIN DENIS
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	DIAGNOSIS HAND TOOLS HUMAN NECESSITIES HYGIENE IDENTIFICATION MANIPULATORS MEDICAL OR VETERINARY SCIENCE PERFORMING OPERATIONS PORTABLE POWER-DRIVEN TOOLS SURGERY TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FORFASTENING, CONNECTING, DISENGAGING OR HOLDING TRANSPORTING
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Beschreibung
Zusammenfassung:	The screw comprises a drive head (10) and a threaded shank (3), the joint between which shears at an effort below that which leads to the shank breaking. The head connects with the shank through a polygonal-section rod (12) which can be inserted and withdrawn from a hole (7) of similar cross-section. The head and rod are connected by a neck (11) which shears at a given effort, while the head, neck and rod have an axial channel through them to receive a guide rod. After the drive head has sheared off the screw can be turned by replacing it with a solid head and polygonal rod inserted into the hole in the screw. Dans la vis (2) selon l'invention, la liaison en rotation entre la tête de manoeuvre (10) de la vis (2) et le corps (3) de la vis (2) est conformée de manière à pouvoir être supprimée en deçà du couple pouvant conduire à une rupture du corps (3), et le corps (3) comprend des moyens (7) permettant sa manoeuvre en rotation, après suppression de cette liaison.L'instrument permettant la manoeuvre de la vis (2) en rotation est conformé pour retenir la tête (10) dans le cas ou la suppression de la liaison de la tête (10) et du corps (3) amène à une séparation de cette tête (10) et de ce corps (3).