04207870 is referenced by 283 patents and cites 8 patents.

A blood sampling assembly is provided which has a cannula designed for intravenous penetration, a mechanism for applying negative pressure to the cannula, a chamber located between the cannula and the source of negative pressure, a one-way valve positioned within the chamber, and a venting member within the chamber which allows the venting of air as blood enters the chamber, but does not allow the passage of blood. A person drawing blood is enabled to visually determine when a needle is properly inside a vein through transparent walls of the chamber. Spillage of blood is avoided with the present assembly by the resistance of the one-way valve to flow distally from the intravenous cannula.

Title
Blood sampling assembly having porous vent means vein entry indicator
Application Number
5/915670
Publication Number
4207870
Application Date
June 15, 1978
Publication Date
June 17, 1980
Inventor
William N Eldridge
Rutherford
NJ, US
Agent
Kane Dalsimer Kane Sullivan and Kurucz
Assignee
Becton Dickinson and Company
NJ, US
IPC
A61B 5/14
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