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Blood sampling assembly having porous vent means vein entry indicator

  • US 4,207,870 A
  • Filed: 06/15/1978
  • Issued: 06/17/1980
  • Est. Priority Date: 06/15/1978
  • Status: Expired due to Term
First Claim
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1. A multiple blood sampling assembly adapted to be coupled with an evacuated container to obtain blood samples from a patient, comprising:

  • a housing having a forward end and a rear end and having a chamber therein, the chamber having walls which are at least partially translucent;

    a first cannula mounted to a forward end of the housing and in fluid communication with the chamber;

    a second cannula mounted to the rear end of the housing and in fluid communication with the chamber;

    a cup chaped one-way valve positioned within the chamber and having a resilient skirt which sealingly bears against the walls of the chamber when blood flows under tourniquet pressure from said first cannula; and

    venting means in the form of a porous material within said chamber, said venting means positioned within said chamber such that blood may flow under tourniquet pressure from the first cannula into the chamber only up to the point where the one-way valve is located as gas is displaced through the venting means, the venting means also positioned such that gas is displaced from a portion of the chamber on a side of the valve towards the first cannula, through the venting means, and to the atmosphere via the second cannula.

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