Intramedullary cavity nail for the treatment of fractures of...

A - Human Necessities – 61 – B

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A61B 17/58 (2006.01) A61B 17/72 (2006.01) A61B 17/78 (2006.01) A61F 2/32 (2006.01) A61B 17/17 (2006.01) A61B 17/86 (2006.01)

Patent

CA 2227290

An intramedullary cavity nail for the treatment of proximal femoral fractures, comprises a solid elongate body with a proximal portion (2) having at least one transverse bore for accommodating a corresponding screw (9, 10) for stabilizing the femoral neck, the proximal portion being joined to a distal portion (3) having at least one distal bore (16) for accommodating at least one diaphysis screw for stabilizing the distal part of the femur. The proximal portion (2) has a substantially constant diameter (.PHI.p) adapted to be stably anchored in a relatively limited length bore of the femur for reducing blood losses, while said distal portion (3) has a substantially constant diameter (.PHI.d) which is less than that of said proximal portion, for ease of insertion in the medullary canal of the femur without any drilling. The proximal and distal portions (2, 3) are substantially rectilinear and form between themselves a predetermined deviation angle (.beta.) in a lateral plane. The proximal portion (2) has a pair of inclined bores (7, 8) adapted for accommodating respective cephalic screws (9, 10) for the fixing of the femoral head. A template (20 with provision for angularly keyed engagement to the proximal end of the nail, has alignment bores for stabilized guidance of drill bits with each of the respective transverse bores of the intramedullary nail.

Clou destiné à être inséré dans la cavité intramédullaire dans le traitement des fractures fémorales proximales. Il comprend un corps solide allongé ayant une portion proximale (2) qui comporte au moins une ouverture transverse pour loger une vis correspondante (9, 10) afin de stabiliser le col du fémur; la portion proximale est jointe à une portion distale (3) ayant au moins une ouverture distale (16) pour loger au moins une vis diaphysaire afin de stabiliser la partie distale du fémur. La portion proximale (2) a un diamètre sensiblement constant (.PHI.p) adapté de manière à pouvoir être ancrée de façon stable dans une ouverture du fémur de longueur relativement restreinte pour réduire les pertes de sang, alors que ladite portion distale (3) a un diamètre sensiblement constant (.PHI.p) qui est inférieur à celui de ladite portion proximale, afin de faciliter l'insertion dans le canal rachidien du fémur sans forage. Les portions proximales et distales (2, 3) sont sensiblement rectilignes et forment entre elles un angle d'écart prédéterminé (.bêta.) dans un plan latéral. La portion proximale (2) comporte une paire d'ouvertures inclinées (7, 8) adaptées à leurs vis céphaliques respectives (9, 10) pour fixer la tête du fémur. Un modèle (20) prévoyant une prise calvetée à angle avec l'extrémité proximale du clou, comporte des ouvertures d'alignement pour guider fermement la perceuse par rapport à chacune des ouvertures transverses du clou intramédullaire.

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