Surface electromyography system, recorder and method

Electromyogram recorder for recording

• an electromyography signal between a first electrode and a second electrode, the recorder comprising:
• a first interface for obtaining a first signal from a first electrode area of the first electrode configured to contact a skin of a subject;
• a second interface for obtaining a second signal from a second electrode area of the first electrode, wherein the first electrode area and the second electrode area are insulated from each other;
• wherein the recorder is configured to perform a noise measurement between the first electrode area and the second electrode area of the first electrode and configured to determine a contact quality of an electrode-skin contact of the first electrode based on the noise measurement between the first electrode area and the second electrode area, and wherein the recorder includes an output unit configured to output a notification to reposition the first electrode when the noise measurement between the first electrode area and the second electrode area exceeds a predetermined threshold;
• and further comprising a switching unit for selectively connecting the first electrode area and the second electrode area to a measurement unit of the recorder for performing the noise measurement;
• or
• the first electrode and the second electrode to the measurement unit of the recorder for recording the electromyogram.

Method for electromyogram measurements comprising the steps of:

• obtaining a first signal from a first electrode area of a first electrode configured to contact a skin of a subject;
• obtaining a second signal from a second electrode area of the first electrode, wherein the first electrode area and the second electrode area are insulated from each other;
• performing a noise measurement between the first electrode area and the second electrode area of the first electrode and determining a contact quality of an electrode-skin contact of the first electrode based on the noise measurement between the first electrode area and the second electrode area;
• outputting a notification to reposition the first electrode when the noise measurement between the first electrode area and the second electrode area exceeds a predetermined threshold;
• recording an electromyography signal between the first electrode and a second electrode;
• and further comprising a switching unit for selectively connecting the first electrode area and the second electrode area to a measurement unit of the recorder for performing the noise measurement;
• or
• the first electrode and the second electrode to the measurement unit of the recorder for recording the electromyogram.