Importance

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Abstract

A tissue penetrating cannula comprises a tube having a sharp end formed by a first cut surface defining an acute angle to the longitudinal axis of the tube and forming a generally oval tube edge defining a similar acute angle to the longitudinal axis. A second cut surface is defined along a right hand forward portion of the oval tube edge, and a third cut surface is defined along a left hand forward portion of the oval tube edge. A second and third cut surfaces define between them a forward cutting surface in the tube edge. A fourth cut surface at the point intersects the second and third cut surfaces to cause the cutting surface to be spaced inwardly of the tube outer wall. Fifth and sixth cut surfaces are provided to respectively flatten the tube edge between the first and second surfaces and the first and third surfaces.

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First Claim