Ultrasonic surgical tool

A - Human Necessities – 61 – B

Patent

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Details

A61B 17/32 (2006.01)

Patent

CA 2652740

At the surgical tool's proximal end, there is a first means (3) to generate ultrasonic vibration in a torsional shear mode. There is also a second means (2) to generate ultrasonic vibration in a longitudinal compression mode. A wave guide (4) is operatively connected to both generating means and extending therefrom by a distance of n.lambda./2 to a distal end provided with cutting and/or coagulating means. The ratio of the wavelengths of the longitudinal compression wave and the torsional shear wave, .lambda.c : .lambda..tau., is an odd number. Preferably .lambda.c = Nx.lambda..tau. (where N is an odd integral number and x is an integer). Delicate shear motion of the torsional ultrasonic vibrational mode is combined with the more vigorous excitation of the longitudinal compression wave ultrasonic vibration.

L'invention concerne un instrument chirurgical qui présente au niveau de son extrémité proximale un premier moyen (3) destiné à générer une vibration ultrasonique dans un mode de cisaillement en torsion. Ledit instrument chirurgical présente aussi un deuxième moyen (2) destiné à générer une vibration ultrasonique dans un mode de compression longitudinale. Un guide d'ondes (4) est relié de manière fonctionnelle aux deux moyens de génération et s'étend, à partir de ceux-ci, d'une distance de n.lambda./2 vers une extrémité distale munie de moyens de coupe et/ou de coagulation. Le rapport des longueurs d'onde de l'onde de compression longitudinale et de l'onde de cisaillement en torsion, .lambda.c : .lambda..tau., est un nombre impair. De préférence : .lambda.c = Nx.lambda..tau. (où N est un nombre entier impair et x est un entier). Le mouvement de cisaillement délicat du mode de vibration ultrasonique en torsion est associé à l'excitation plus vigoureuse de la vibration ultrasonique de l'onde de compression longitudinale.

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