Apparatus for continuously measuring intracompartmental pressure within a body cavity

摘要

An apparatus for monitoring intracompartmental pressures, such as intrauterine pressure, is disclosed. The apparatus comprises a catheter having a first chamber formed in the interior of the catheter tip which is in amniotic fluids communications with the fluids contained in the uterus. A second chamber is defined by a lumen of the catheter and is filled with air. The lumen extends the length of the catheter from the first chamber at the tip of the catheter to a diaphragm of a pressure transducer located at the end of the catheter. Thus, an air column is formed in the second chamber defined by the lumen. The relative volumetric cubic capacity of the first and second chambers is such that, under maximum pressures which are within expected ranges, the trapped air column prevents any liquid fluids from entering the second chamber. Also, provided is a valve 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 places a 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 may also be provided in the catheter to allow for infusion of fluids into and/or withdrawal of fluid samples from the uterus.