Recording of Myometrial Activity in the Non‐Pregnant Human Uterus by a Micro‐Transducer Catheter

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Abstract
A micro‐transducer catheter was tested in vitro and in vivo for recording of myometrial activity in the non‐pregnant human uterus and was also compared with conventional fluid‐filled, open end catheters previously used for recording intra‐uterine pressures. The microtransducer catheter had a frequency response far above that of fluid‐filled, open end catheters. It was easily introduced through the uterine cervix and was never obstructed. Provided that the sensory surface of the microtransducer was kept from direct contact with the uterine wall by some special arrangement it gave recordings of the intra‐uterine pressure, that were practically identical with those obtained by an open end catheter.