US 12,324,664 B2
Microvolume 3-way stopcock and method for obtaining clean blood specimen
Jonathan K. Miller, Farmington, UT (US); and Ben D. Shirley, Draper, UT (US)
Assigned to UTAH MEDICAL PRODUCTS, INC., Midvale, UT (US)
Filed by UTAH MEDICAL PRODUCTS, INC., Midvale, UT (US)
Filed on Mar. 3, 2022, as Appl. No. 17/686,369.
Prior Publication US 2023/0277102 A1, Sep. 7, 2023
Int. Cl. A61B 5/15 (2006.01); A61M 39/22 (2006.01)
CPC A61B 5/150221 (2013.01) [A61B 5/150213 (2013.01); A61B 5/150992 (2013.01); A61M 39/223 (2013.01); A61M 2039/229 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A microvolume 3-way stopcock for use in a blood sampling system comprising:
a stopcock body comprising:
a cylindrical-shaped central chamber;
an inlet fluid passage configured to extend from the central chamber to a male luer connector;
a cannula insert disposed within the inlet fluid passage comprising a lengthwise inlet fluid pathway;
a blood sample fluid passage configured to extend from the central chamber to a blood sample female luer connector;
a blood sample cone disposed within the blood sample fluid passage comprising a lengthwise blood sample fluid pathway;
a waste fluid passage configured to extend from the central chamber to a waste fluid female luer connector; and
a waste cone disposed within the waste fluid passage comprising a lengthwise waste fluid pathway;
a rotatable flow control member disposed within the central chamber and comprising a T-shaped fluid passage, wherein the rotatable flow control member is configured to provide adjustable fluid communication between the inlet fluid passage, the blood sample fluid passage, and/or the waste fluid passage; and
a lever connected to the rotatable flow control member configured to permit selective rotation of the rotatable flow control member and control fluid flow between the fluid passages, wherein the inlet fluid pathway, the blood sample fluid pathway, and the waste fluid pathway each have an inner cross-sectional area in the range from 0.3 to 2.0 square millimeters.