Biomedical electrode configuration for suppressing movement artifact

摘要

A biomedical sensor for detecting EMG signals may include a non-conducting fixed framework supporting a symmetrical arrangement of four electrode surfaces, configured as two signal detection contacts, each with a respective associated signal reference contact. The mechanical and electrical configuration act together to suppress movement artifact.

主权项

1. A biomedical sensor for sensing phenomena of a muscle, comprising: a substrate; a plurality of conductive areas arranged to be spaced along a length of the substrate and configured as signal detection contacts each with a proximate, distinct respective associated signal reference contact, forming a plurality of signal detection/reference contact pairs spaced along the length, each one in the plurality of signal detection/reference contact pairs being aligned in a direction transversely to the length and in parallel with respect to each other so that each signal detection/reference contact pair produces movement induced artifacts in unison in response to relative movement between the plurality of signal detection/reference contact pairs and the muscle; and a differential sensing circuit that receives input from each of the signal detection/reference contact pairs and provides an output that is an arithmetic difference between the signals detected at detection contacts measured with respect to the reference contacts, the reference contacts being directly electrically coupled together and to a reference input of the differential sensing circuit, and the detection contacts being provided at separate inputs to the differential sensing circuit, wherein each signal detection/reference contact pair is configured to react in response to the relative movement, wherein at least one common electrical component caused by the relative movement is cancelled out by the differential sensing circuit, and wherein the at least one common electrical component caused by the relative movement includes the movement induced artifacts that are suppressed by the differential sensing circuit.