Flexible surgical instruments incorporating a hollow lumen coil

A - Human Necessities – 61 – B

Patent

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Details

A61B 10/00 (2006.01) A61B 17/32 (2006.01) A61B 17/00 (2006.01) A61B 17/28 (2006.01)

Patent

CA 2200743

A hollow lumen coil (10) for a surgical instrument according to the invention is made from a continuous helically wound filament which is wound with different pre-load tension at different portions (10a, 10b, 10c) of the coil (10). When a relatively high pre-load tension is applied to the filament as the coil is wound, the coil will be relatively stiff. When a relatively low pre-load tension is applied to the filament as the coil is wound, the coil will be relatively flexible. By varying the pre-load tension applied to the filament while winding the coil, the coil is provided with areas of different stiffness and flexibility. The pre-load tension may be varied gradually or abruptly and may be varied several times along the length of the coil. Surgical instruments incorporating the coil are also disclosed. The coil is preferably made from stainless steel Type 304 wire having a diameter of approximately 0.021 inches and is wound with tensions ranging from nil to several pounds.

La présente invention concerne une lumière réalisée par serpentin (10) et destinée à un instrument chirurgical. Elle est fabriquée à partir d'un filament à enroulement hélicoïdal résultant d'un boudinage réalisé en appliquant différentes tensions de précontrainte en différents points (10a, 10b, 10c) du serpentin (10). Si la tension de précontrainte appliquée au filament pendant l'opération de boudinage est relativement élevée, le serpentin est relativement rigide. Si la tension de précontrainte appliquée pendant l'opération de boudinage est relativement basse, le serpentin est relativement souple. En jouant sur la tension de précontrainte appliquée au filament pendant l'opération de boudinage, on confère au serpentin des différences de rigidité et de souplesse se répartissant par zones. La variation de tension de précontrainte peut être progressive ou brutale, ces variations pouvant intervenir plusieurs fois le long du serpentin. L'invention concerne également des instruments chirurgicaux incorporant ce serpentin. Le serpentin est fait de préférence avec un fil d'acier inoxydable de type 304 d'un calibre approximatif de 0,021 pouces, le boudinage étant réalisé en utilisant des tensions de précontrainte allant de zéro à plusieurs livres.

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