Patent ID: 6213989
Filing Date: 2001-04-10
Classification: A61M

Abstract:
A tissue-penetrating cannula which comprises a tube having an outer wall, and a sharp end defined by a first cut surface defining an acute angle to the longitudinal axis of said tube and forming a generally oval tube edge defining a similar acute angle to said longitudinal axis;a second cut surface defined along a right hand forward portion of said oval tube edge; a third cut surface defined along a left hand forward portion of said oval tube edge, said second and third cut surfaces defining between them a forward cutting surface in said tube edge; a fifth cut surface extending along said tube edge between said first and second surfaces in a position to flatten said tube edge, compared with a tube edge comprising joined first and second surfaces without said fifth cut surface, and a sixth cut surface extending along said tube edge between said first and third surfaces on a side of said needle opposed to said fifth cut surface in a position to flatten said tube edge, compared with the tube edge comprising joined first and third surfaces without said sixth cut surface.