Set screw for medical implants

A - Human Necessities – 61 – B

Patent

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Details

A61B 17/86 (2006.01) A61B 17/56 (2006.01) A61B 17/70 (2006.01) A61B 17/88 (2006.01) A61B 19/00 (2006.01)

Patent

CA 2346986

This invention is a low profile removable set screw (1) for use in connecting one medical implant to another, and for similar uses. The set screw has a base (11), and a head (10) that is breakable from the base in a breakaway region (12) at a preselected torque, such that the head allows rotation of the screws and torquing of a tip of the base against one of the implants during installation. The screw includes a groove (32) or a notch at the breakaway region to trigger breaking. The screw also includes a pair of slots (35, 36) extending radially from an outer threaded surface (24) of the base part way into the base. The slots intersect with the breakaway region, but not with each other leaving a center core in the base. A tool (4) is provided for removing the base after the head is broken away. The tool includes a pair of spaced ears (54, 55) that are received in the slots, and provide for rotation of the base by rotating the tool. A bore of larger width than the slots is centered on each slot at the breakaway region providing relief for metal adjacent to the bores during torquing, and breaking.

L'invention concerne une vis de fixation amovible (1) de faible épaisseur utilisée pour relier un implant médical à un autre et à des fins analogues. La vis de fixation présente une base (11) et une tête (10) que l'on peut détacher de la base en suivant une zone de rupture (12) au moyen d'une torsion présélectionnée de sorte que la tête permette la rotation de la vis et la torsion d'un bout de la base contre un des implants en cours d'installation. La vis présente une rainure (32) ou une encoche au niveau de la zone de rupture en vue d'un détachement par détente. La vis comprend aussi une paire de fentes (35, 36) s'étendant radialement à partir de la surface filetée extérieure (24) du chemin de la base dans la base. Les fentes rejoignent la zone de rupture sans se rejoindre, laissant un noyau central dans la base. Un instrument (4) permet d'éliminer la base une fois que la tête est détachée et comprend une paire de pattes (54, 55) reçues dans les fentes. La rotation de l'instrument fait tourner la base. Un alésage d'une épaisseur plus large que les fentes est centré sur chaque fente au niveau de la zone de rupture assurant une détente au métal à proximité des alésages pendant la torsion et la rupture.

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