APPARATUS FOR MEASURING PRESSURE WITHIN BODY CAVITY

摘要

An apparatus (10) for monitoring intracompartmental pressures, such as intrauterine pressure, is disclosed. The apparatus (10) comprises a catheter (12) having a first chamber (16) formed in the interior of the catheter tip which is in fluid communication with the amniotic fluids contained in the uterus. A second chamber is defined by a lumen (30) of the catheter (12) and is filled with air. The lumen (30) extends the length of the catheter (12) from the first chamber (16) at the tip of the catheter (12) to a diaphragm of a pressure transducer (62) located at the end of the catheter (12). Thus, an air column is formed in the second chamber defined by the lumen (30). The relative volumetric cubic capacity of the first and second chambers (16, 30) is such that, under maximum pressures which are within expected ranges, the trapped air column prevents any liquid fluids from entering the second chamber (30). Also provided is a valve (50) which in a first or ''zero'' position causes both sides of the pressure transducer diaphragm to be placed at atmospheric pressure. In a second or ''monitoring'' position the valve (50) places at one side of the diaphragm in communication with the intrauterine pressures transmitted through the lumen and a side of the diaphragm is vented to atmosphere. A second or infusion lumen (28) may also be provided in the catheter (12) to allow for infusion of fluids into and/or withdrawal of fluid samples from the uterus.