Sensor array and sensor array system for sensing electrical activity

A device for measuring electrical potentials of a body part of a patient, the device comprising:

• a plurality of substrate nodes made of a flexible material, the plurality of substrate nodes being configured to be disposed on the torso of the patient, wherein some pairs of substrate nodes of the plurality of substrate nodes are interconnected by straight portions of flexible material, the plurality of substrate nodes and the straight portions of flexible material forming a flexible substrate, wherein there is one straight portion per pair of substrate nodes to be interconnected,
• a plurality of electrodes, wherein each electrode of the plurality of electrodes is disposed on a respective substrate node of the plurality of substrate nodes, and
• at least one connector,
• wherein each electrode of the plurality of electrodes is connected to the at least one connector through a respective conductive path, wherein each conductive path is embedded in the flexible substrate formed by substrate nodes and straight portions,
• wherein only some of the straight portions connecting two substrate nodes have an embedded conductive path,
• the device being configured to remove one or more substrate nodes and corresponding electrodes by cutting the portions which connect the one or more substrate nodes and corresponding electrodes with the remaining substrate nodes in the device, without interrupting the conductive paths of the remaining electrodes in the device.