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Hypodermic cannula

  • US 5,536,259 A
  • Filed: 07/28/1995
  • Issued: 07/16/1996
  • Est. Priority Date: 07/28/1995
  • Status: Expired due to Fees
First Claim
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1. 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 and 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; and

    a fourth cut surface intersecting the second and third cut surfaces to cause said cutting surface to be spaced inwardly from said outer wall.

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