Handle for polypectome snare with bipolar electrodes

Details Handle for polypectome snare with bipolar electrodes Handle for polypectome snare with bipolar electrodes

1990-10-01

1991-06-25

Pellegrino, Stephen C.

Surgery

Instruments

Electrical application

606 48, 606113, A61B 1739

Patent

active

050263714

ABSTRACT:
An improved handle for a polypectome snare for use in excising polyps from an internal body cavity. The apparatus generally comprises a radio frequency polypectome snare which includes a hand grip assembly, a flexible tubing assembly capable of fitting within an endoscope, an electrode loop portion and a power supply means. The hand grip assembly is made of molded pieces of inflexible plastic comprising a longitudinal housing portion and a slide member having opposing finger grip members. When the slide member is in its most proximal position, the electrode loop portion is withdrawn into the flexible tubing. As the slide member is advanced toward the distal end of the longitudinal housing, the electrode wires are advanced out of the flexible tubing, forming a loop that can be placed around the stem of a polyp. Once again withdrawing the loop into the end of the flexible tubing while simultaneously applying RF voltage shears the polyp at its base. The slide member and housing are designed to be molded using conventional equipment, a significant improvement over the prior art in which several pieces had been proportioned by hand. This is possible because the molded housing of the hand grip is fitted with a longitudinal slot which receives the molded slide member in such manner that the only movement permitted is proximal or distal to the tubing. The electrode wires are affixed to a molded slide block on the slide member and are encased in rigid conductor tubes that extend the full length of the housing. A molded guide and retaining hub further stabilize the wires in the distal end of the housing. The electrode wires thus remain insulated from one another and do not short or arc because this stabilized arrangement at the distal end of the housing works in tandem with the stabilizing aspect of the slide member slide block to prohibit twisting of the wires or conductor tubes.

REFERENCES:
patent: 3955578 (1976-05-01), Chamness et al.
patent: 4311143 (1982-01-01), Komiya
patent: 4493320 (1985-01-01), Treat
patent: 4905691 (1990-03-01), Rydell

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