The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 06, 2010
Filed:
Jun. 20, 2003
Greg L. Brimhall, West Jordan, UT (US);
Greg L. Brimhall, West Jordan, UT (US);
Becton, Dickinson and Company, Franklin Lakes, NJ (US);
Abstract
A method is provided for controlling the fluid flow rate in an extension tube of an introducer needle assembly for use as confirmation flashback. The introducer needle assembly has a catheter attached to a catheter hub with a side port, an extension tube attached to the side port on the catheter hub, and an introducer needle with a notch adapted to be inserted into a bore in the catheter. A lumber extends through the needle and is in fluid communication with the notch. The needle has an outer diameter smaller than the diameter of the bore such that an annular space is defined between the catheter and the needle. The fluid, typically blood, is at a pressure and has a viscosity when the needle accesses it. A preferred minimum fluid velocity of the fluid through the extension tube is selected (preferably at least 1 inch per minute though the extension tube in certain applications). The notch and the annular space are sized based, at least in part, on the viscosity of the fluid and the pressure of the fluid to achieve the preferred flow rate though the extension tube.