×

Piercing and sampling probe

  • US 5,354,537 A
  • Filed: 04/27/1992
  • Issued: 10/11/1994
  • Est. Priority Date: 04/27/1992
  • Status: Expired due to Term
First Claim
Patent Images

1. A needle suitable for piercing a septum of a vacuum sealed container and through which a measured fluid sample from the container may be withdrawn, comprising:

  • an elongated body having a longitudinal axis, an unobstructed bore therethrough along the longitudinal axis, a free end, and an end region adjacent said free end which has a conical taper toward said free end at a predetermined angle relative to the longitudinal axis, said free end comprising an oblique cut through the conically tapered end region at an angle relative to the longitudinal axis, said free end further comprising a toe portion which initially encounters a septum and slices a path therethrough and a heel portion which follows the path of the toe portion, said toe portion and said heel portion each having a respective height measured along the longitudinal axis, said heel portion being passivated so as to prevent septum coring, and said angle being substantially larger than the predetermined angle of the conical taper so as to produce an elliptical opening at the free end on a plane diagonal to the longitudinal axis whereby said toe portion is reduced in height relative to said heel portion height.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×