Bipolar endoscopic surgical scissor instrument

A - Human Necessities – 61 – B

Patent

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Details

A61B 18/14 (2006.01)

Patent

CA 2210726

Endoscopic bipolar scissor blades (26, 28) are provided and include a pair of metallic electrically conductive blades each having a cutting edge (26a, 28a) and an adjacent shearing surface (26f, 28f), where at least one of the blades is partially covered with an electrically insulating ceramic material (29). The partial ceramic covering covers substantially the entire cutting edge of the blade and a relatively small portion of its shearing surface adjacent to the cutting edge. If desired, a larger angled portion (29b, 28f) of the shearing surface may be covered. The ceramic covering is applied by either masking the portion of the blade which is not to be covered and by spraying the masked blade with a ceramic, or by bonding a thin ceramic member to the blade. In another embodiment of the invention, a scissor blade (126, 128) is provided with an insert receiving channel groove (128g) on a portion of its shearing surface adjacent to its cutting edge. A ceramic insert (129) having a groove engaging tongue portion (129c) is inserted into the channel groove (128g) and forms a ceramic cutting edge on the metallic blade. An endoscopic bipolar cautery scissors instrument (10) which utilizes the partially covered blades of the invention is also described.

Il est question de lames (26, 28) de ciseaux endoscopiques bipolaires. L'invention comprend une paire de lames métalliques conductives d'électricité, chacune ayant un bord tranchant (26a, 28a) et une surface de cisaillement adjacente (26f, 28f); au moins une des lames est partiellement recouverte d'un matériau céramique diélectrique (29). Le revêtement partiel de matériau céramique recouvre en entier le bord tranchant de la lame et une petite partie de sa surface de cisaillement adjacente. Au besoin, une plus grande partie (29b, 28f) de la surface de cisaillement peut être recouverte. Le revêtement en céramique est appliqué soit en masquant la partie de la lame qui ne doit pas être recouverte et en vaporisant la lame masquée d'un matériau céramique, soit en fixant une mince pièce de céramique à la lame. Dans une autre application de l'invention, une rainure (128g) pouvant accueillir une plaquette est pratiquée dans une lame de ciseau (126, 128), dans une partie de sa surface de cisaillement adjacente à son bord de coupe. Une plaquette céramique (129) dotée d'une languette (129c) est introduite dans la rainure (128g) et forme un bord tranchant en céramique sur la lame métallique. On décrit aussi des ciseaux endoscopiques bipolaires de cautérisation (10) qui utilisent les lames partiellement recouvertes que constitue l'invention.

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