Loop electrodes for electrocautery probes for use with a...

A - Human Necessities – 61 – B

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A61B 18/14 (2006.01)

Patent

CA 2218519

An electrocautery probe (112) includes a distal loop electrode (122) mounted between a pair of arms (123, 125) which are joined at their proximal ends to an electrode lead (127), and a mounting sleeve (129) for slidable coupling the probe to the guide tube (14) of a resectoscope (10). The loop electrode is formed with a relatively broad lower surface defining a sharp distal edge (122a) and a sharp proximal edge (122b). The electrode may have a triangular cross section or a cross section which is defined by an upper convex surface and a lower flat surface. Tests have demonstrated that the electrode according to the invention is approximately 90 % more effective in coagulation than the known loop electrodes. It is believed that the sharp distal and proximal edges aid in cutting and focus cautery current to this effect while the relatively broad base serves to enhance coagulation.

Une sonde (112) d'électrocautérisation comprend une électrode distale (122) en forme de boucle montée entre une paire de bras (123, 125) qui sont réunis au niveau de leurs extrémités proximales à un conducteur (127) de l'électrode, et un manchon (129) de fixation servant à accoupler par glissement la sonde au tube de guidage (14) d'un résectoscope (10). L'électrode en forme de boucle est constituée d'une surface inférieure relativement large formant un bord distal tranchant (122a) et un bord proximal tranchant (122b). L'électrode peut avoir une section triangulaire ou une section transversale formée par une surface supérieure convexe et une surface inférieure plate. Des tests ont mis en évidence que l'électrode de l'invention est d'environ 90 % plus efficace dans la coagulation que les électrodes en forme de boucle connues. Il semble que le bord distal tranchant et le bord proximal tranchant facilitent le sectionnement et la focalisation du courant de cautérisation tandis que la base relativement large sert à favoriser la coagulation.

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