View Full Version : Temperature drops during fluid flow in catheters.

Special Projects
11-21-1997, 06:22 AM
Hello All,

I am currently involved in a research project where we are trying to pump
water using a syringe pump through a catheter and have the temperature
exiting the catheter increase or remain the same. However, with
temperatures even as high as 80 degrees Celsius, the temperature exiting
the catheter still experiences a dramatic drop. I take it that our system
is similar to a throttling system mentioned in Thermodynamics but I am not
positive. Our catheters are approximately six feet in length and only a
few millimeters in diameter. They are usually 6 or 7 lumen catheters with
liquid being pumped through the center lumen and oxygen pumped through the
remaining lumens. I am looking for suggestions on how we can possibly
eliminate this drop in temperature. I am assuming that it is due to a drop
in pressure if our system represents a throttling system, such as a
capillary tube. Is there a method to possibly increase the pressure before
the water exits the catheter?

Any help would be much appreciated.

P.S. Does anyone know of a biomedical list server other than BIOMCH-L?

Special Projects, Trudell Medical International
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