An electrosurgical tubular trocar

A - Human Necessities – 61 – B

Patent

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Details

A61B 18/14 (2006.01) A61B 17/00 (2006.01) A61B 17/34 (2006.01) A61M 13/00 (2006.01) A61B 17/39 (1995.01)

Patent

CA 2137004

An electrosurgical tubular trocar system (10) has a hollow tube (13) substantially longer than its diameter. The tube (13) is shaped for insertion in a direction generally along its axis through tissue of a human or animal body. Distal and proximal ends (17 and 18) on the tube (13) enter and remain outside the tissue, respectively. A tip (19) on the distal end (17) punctures tissue of a human or animal. An insulating portion (20) of high dielectric material extends along the tube (13) between the distal and proximal ends (17 and 18). An electrode (14) on the insulating portion (20) extends from the proximal end (18) to the tip (19) to transmit radio frequency energy. A tip point (19) at an acute angle to the axis lessens the initial force necessary for entry of the tube (13). The return path (16) is a conductor (23) on the insulating portion (20) for bipolar cutting across a gap (25). An alternate system may have the return path (16) as a conductive pad (15) in contact with the tissue as a monopolar circuit. The tube (13) may be in fluid communication for flow.

Un système de trocart électrochirurgical tubulaire (10) comporte un tube creux (13) sensiblement plus long que son diamètre. Le tube (13) est formé pour une insertion dans la direction générale de son axe à travers les tissus d'un corps humain ou animal. Les extrémités distale et proximale (17 et 18) du tube (13) entrent dans les tissus et restent à l'extérieur de ceux-ci, respectivement. Une pointe (19) de l'extrémité distale (17) perce le tissu d'un humain ou d'un animal. Une portion isolante (20) de matériau hautement diélectrique s'étend le long du tube (13) entre les extrémités distale (17) et proximale (180. Une électrode (14) sur la portion isolante (20) s'étend depuis l'extrémité proximale (18) jusqu'à la pointe (19) pour transmettre une énergie en radiofréquence. La pointe (19) ayant un angle aigu par rapport à l'axe diminue la force initiale nécessaire pour l'entrée du tube (13). Le circuit de retour (16) est assuré par un conducteur (23) sur la portion isolante (20) pour une coupure bipolaire à travers un espacement (25). Un système alternatif peut avoir un circuit de retour (16) sous la forme d'un coussinet conducteur (15) en contact avec le tissu, constituant un circuit monopolaire. Le tube (13) peut être en communication fluide pour assurer l'écoulement.

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