1978 Volume 7 Issue 6 Pages 966-969
A double lumen needle has been developed for the access to the bloodstream. Two different size of needles are coaxially assembled, outer needle with lateral perforation near the tip is for inflow and inner needle of for outflow. One sticking of this needle enables to obtain the continuous blood flow through a circuit.
In the basic experiment, we found that there was no recirculation of blood due to backmixing at the tip of the needle, if the blood flow rate in the inflow line was not exceed one half of the blood flow rate in the blood vessel and distance between inlet and outlet port was more than 12mm.
