Surgery – Instruments – Cutting – puncturing or piercing
Patent
1995-04-05
1997-09-02
Buiz, Michael
Surgery
Instruments
Cutting, puncturing or piercing
604264, 411387, A61B 1734
Patent
active
056626738
ABSTRACT:
A safety incising instrument for helically incising a pathway through a body wall at a controlled rate without exerting longitudinal forces on the instrument. The instrument incorporates a helix assembly with a helically-protruding edge made of two cooperating elements: a tapered blade element with a sharp helical blade edge and a resilient shield element with a dull helical edge. The blade and shield elements mate along helical interfaces and jointly define the helically-protruding edge. A periphery of the helix is transformable between an incising position in which the sharp blade edge is exposed and a non-incising position in which the sharp blade edge is not exposed. The shield element is made of resilient material and tissue counterforce or drag on the shield causes the helix to transform to the incising position to incise a pathway in the body wall. Upon penetration of the body wall, the reduction in tissue counterforce on the resilient shield causes the helically-protruding edge to transform to a dull edge thus protecting organs within an anatomic cavity from contact with any sharp blade edge.
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Buiz Michael
Klivans Norman R.
Rasche Patrick W.
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