The invention concerns a multi-electrode patch for abdominal electrophysiological detection. The patch has a flexible substrate interconnecting multiple electrodes and a module unit for removably engaging with an electronic readout device for detecting a maternal and/or fetal electrophysiological signal from the electrodes. The module has a mechanical module unit for removable mechanical engagement with a housing of the readout device, and an electrical module unit for making an electrical connection from the electrodes to the readout device. Engaging the patch with the readout device comprises engaging both the mechanical module unit and the electrical module unit. The patch may be flexible in a manner that allows variation in the relative positioning between the electrodes. The patch and/or electronic readout device may comprise a security device for communication of an authentication code.
