Bonding of soft biological tissues by passing high frequency...

A - Human Necessities – 61 – B

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A61B 18/12 (2006.01) A61B 18/14 (2006.01)

Patent

CA 2321247

A technique for bonding soft biological tissue (2) having an incision (4) therein with forceps (8) adapted to grip a portion of the tissue on both sides of the incision. Electrodes (11) are secured to the forceps for contacting the tissue portion. An electrical power source (12) provides a high frequency electrical signal to the electrodes to be passed through the tissue portion. The electrical power source is controlled to provide the electrodes with one voltage signal during a first of two stages, and another voltage signal during a second of the two stages. During the first stage the voltage rises linearly. During the second stage the voltage is stabilized, and is modulated with a low frequency rectangular signal. A clamping means applies force with the forceps to compress the tissue at one level or at different levels during two time periods while the high frequency voltage is passed through the electrodes. The tissue impedance is measured as a function of time with its minimal value being determined, and stored.

Technique permettant de suturer un tissu biologique mou (2) présentant une incision (4) au moyen d'un forceps (8) conçu pour saisir une partie dudit tissu des deux côtés de l'incision. Des électrodes (11) fixées sur le forceps entrent en contact avec la partie de tissu. Une source d'alimentation électrique (11) applique aux électrodes un signal électrique haute fréquence destiné à traverser la partie de tissu. La source est commandée de façon à appliquer aux électrodes un signal de tension durant une première étape et un autre signal de tension durant une seconde étape. Durant la première étape, la tension monte d'une manière linéaire. Durant la seconde, elle est stabilisée et modulée par un signal rectangulaire basse fréquence. Un système de serrage applique, par l'intermédiaire du forceps, une force qui comprime le tissu avec un seul niveau d'intensité ou avec différents niveaux sur deux temps, pendant que la tension haute fréquence traverse les électrodes. L'impédance tissulaire est mesurée en fonction du temps, avec détermination de sa valeur minimale, puis mise en mémoire.

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