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Catheter insertion unit with separate flashback indication for the cannula

  • US 4,317,445 A
  • Filed: 03/31/1980
  • Issued: 03/02/1982
  • Est. Priority Date: 03/31/1980
  • Status: Expired due to Term
First Claim
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1. In an intravenous unit of the type having a catheter secured at its proximal end to a hub, and a removable piercing needle extending through the hub and catheter with the tip of the needle protruding beyond the distal end of the catheter, the improvement which comprises:

  • said catheter having internal and external surfaces;

    said catheter including a side port therein located adjacent to the distal end of said catheter; and

    the internal surface of said catheter around the side port being configured to define a predetermined flashback chamber between said catheter and needle and extending from the side port to the hub for providing a visual indication of venous entry of said catheter.

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