Ultrasonic medical device operating in a transverse mode

Details Ultrasonic medical device operating in a transverse mode Ultrasonic medical device operating in a transverse mode

A - Human Necessities

61

B

A61B 17/00 (2006.01) A61F 9/007 (2006.01) A61N 7/00 (2006.01) B06B 1/00 (2006.01) B06B 3/02 (2006.01) A61B 17/22 (2006.01) A61L 31/02 (2006.01)

Patent

CA 2386052

An ultrasonic medical device comprises an ultrasonic vibration generator (14) that generates vibration along its longitudinal axis. The ultrasonic vibration is transmitted through an ultrasonic coupler and a series of transformer sections (18, 20) that amplify the ultrasonic vibration. A flexible member (22) is coupled to the distal end of the transformer sections, and is thus supplied with a longitudinal vibration at its base by the transformer sections. The flexible member is designed so that it converts the longitudinal vibration into a standing wave that runs along the length of the flexible member. The standing wave produces a series of nodes and anti-nodes along the length of the flexible member. Each of the anti-nodes produces cavitation in fluids in contact with the probe. The cavitation of the fluids causes destruction of adjacent tissue. In this manner, the entire length of the flexible member becomes a working surface that may be utilized for destroying tissue.

La présente invention concerne un dispositif médical à ultrason qui comprend un générateur (14) de vibration ultrasonore générant une vibration le long de son axe longitudinal. Cette vibration ultrasonore est transmise par un coupleur ultrasonore et par une série de sections de transformateur (18, 20) qui amplifient la vibration ultrasonore. Un élément flexible (22) est couplé à l'extrémité distale des sections de transformateur, et il est ainsi alimenté par une vibration longitudinal au niveau de sa base par les sections de transformateur. Cet élément flexible est conçu de façon à transformer la vibration longitudinale en une onde stationnaire qui court le long de cet élément flexible. Cette onde stationnaire produit une série de noeuds et de ventres sur la longueur de cet élément flexible. Chacun de ces ventres produit une cavitation dans les fluides en contact avec cette sonde. La cavitation de ces fluides entraîne la destruction des tissus voisins. De cette manière, toute la longueur de l'élément flexible devient une surface de travail que l'on peut utiliser pour détruire des tissus.

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