Scientific paperUse of silastic tube and capillary sampling technic in the measurement of tissue PO2 and PCO2

A new method of measuring tissue gases using an implanted Silastic tube has been developed. The Silastic tonometer is filled with anoxic saline which equilibrates to the average PO2 and PCO2 of the surrounding tissue within a few minutes. The equilibrated fluid is collected in an Astrup glass capillary tube that is then emptied into a microcuvette containing either an oxygen or carbon dioxide electrode. Because of the chemical inertness of Silastic, inflammatory reaction around the tonometer is minimal.