Apparatus for monitoring uterine contractions

Abstract

An apparatus () is for use in monitoring uterine contractions. Means are provided for separately detecting () solid (e.g. flush) contact of at least a portion of a sensor unit () of the apparatus on the abdomen, and for a detecting () an initial starting pressure, or a baseline pressure, between the sensor unit and the abdomen. A controller () is arranged to first sense contact of said at least portion of the sensor unit on the abdomen, and then responsive to the contact detection, detect the starting pressure using an integrated pressure sensor. The same pressure sensor is preferably used for monitoring the uterine contractions. The starting pressure provides a direct or indirect measure or indication of the tension of a belt which is arranged in use to hold the apparatus against the abdomen of the subject. By sensing the starting pressure, for example directly responsive to abdomen contact being sensed, this initial pressure value, or derivative therefore, can be used as a direct or indirect indication of the belt tension.