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Filtering blood

  • US 9,427,707 B2
  • Filed: 03/14/2013
  • Issued: 08/30/2016
  • Est. Priority Date: 08/10/2012
  • Status: Active Grant
First Claim
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1. A filtering device for filtering blood to obtain serum or plasma in a container, comparing:

  • a pre-evacuated container including inlet and outlet ends with access at both ends,a filter located within the container, anda flow rate limiting control element located upstream of the filter and designed to limit pressure differential across the filter, the flow rate control element including capillary restriction for limiting blood flow while still enabling continuous blood flow into said pre-evacuated container and after said capillary restriction blood flowing unimpeded within the container toward the filter substantially eliminating hemolysis associated with the filter.

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