Improved apparatus for removal of plastics cement

Details Improved apparatus for removal of plastics cement Improved apparatus for removal of plastics cement

A - Human Necessities

61

B

A61B 17/22 (2006.01) A61F 2/46 (2006.01) A61N 7/00 (2006.01)

Patent

CA 2209096

The apparatus for removal of bone-cement comprises means to generate an ultrasonic signal and a tool element including an elongate stem (1) to transmit the signal to a distal end. A plurality of spoke members (3), preferably four or eight, extend radially from adjacent the distal end to connect with an annular member (2) surrounding and spaced from the distal end. A plurality of openings (4) are each defined by the stem (1), the annular member (2) and two of the spokes (3). The annular member (2) is provided with a distally facing cutting edge. The spokes (3) are so configured as to transmit to and allow axial movement of the annular member (2) with respect to the stem (1), with an enhanced displacement relative to that of the stem (1).

Appareil d'évacuation de ciment osseux, comportant des moyens engendrant un signal ultrasonore et un élément formant outil comprenant une tige allongée (1) pour la transmission du signal jusqu'à une extrémité distale. Plusieurs éléments formant rayons (3), de préférence quatre ou huit, s'étendent dans le sens radial à partir d'un point voisin de l'extrémité distale, et sont reliés à un élément annulaire (2) entourant l'extrémité distale tout en étant écarté de celle-ci. Plusieurs ouvertures (4) sont délimitées chacune par la tige (1), l'élément annulaire (2) et deux des rayons (3). L'élément annulaire (2) est pourvu d'une arête coupante orientée dans le sens distal. Les rayons (3) sont conçus pour animer l'élément annulaire (2) d'un mouvement axial par rapport à la tige (1), de sorte que son déplacement soit plus important que celui de la tige (1).

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