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Device and method for restricting venous flow for improved blood sampling

  • US 5,893,870 A
  • Filed: 07/21/1997
  • Issued: 04/13/1999
  • Est. Priority Date: 07/21/1997
  • Status: Expired due to Fees
First Claim
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1. A method of restricting venous flow in a body extremity comprising:

  • providing an adjustably sized main loop adapted to fit about a tip of an extremity and defined by a main flexible stretchable band having a first end extending through a secondary loop defined at a second end of the main band the main loop and the second loop having surfaces adapted for frictional engagement with each other;

    sliding the main loop over about a tip of the extremity;

    pulling the first end of the main band further through the secondary loop and in a direction outward from the extremity so that the main band stretches and causes stretching of the secondary loop, thereby causing the main loop to tighten about the extremity with sufficient pressure to restrict venous flow of blood through the tip of the extremity,wherein a combination of stretching of the main loop and of the secondary loop against each other in tension, and of frictional engagement of the main loop against the secondary loop releasably secures the main loop relative to the secondary loop to releasably secure the main loop about the extremity in the tightened position to restrict venous flow, whereupon the tightened position is maintained upon release of the free first end of the main band.

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