Diaphragm electromyography analysis method and system

US5671752A · kind A · utility

Assignee

• Universite de Montreal/The Royal Insitution for the advancement of Learning (McGill University) · CA

Inventors

• Christer Sinderby · Toronto, CA
• Alejandro Grassino · Westmount, CA
• Sven Friberg · Kinna, SE
• Lars Lindstrom · Kinna, SE

Key dates

• Filing date: Mar 31, 1995
• Grant date: Sep 30, 1997
• Expiry date: Mar 31, 2015

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61M2230/60
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

In the method and system for electromyographic analysis of a striated muscle, electromyographic signals produced by the muscle are detected by means of an array of electrodes passing through the center of the muscle depolarizing region. Each electromyographic signal comprises an electromyographic component and a noise component. The position of the center of the muscle depolarizing region is then determined by detecting a reversal of polarity of the electromyographic components of the signals. Finally, two signals of opposite polarities amongst the electromyographic signals are subtracted. The subtraction subtracts the noise components of the two signals from each other but adds the electromyographic components of the two signals together to produce an electromyographic signal of improved signal-to-noise ratio. Advantageously, the array of electrodes is a linear array of successive electrodes, the center of the muscle depolarizing region is located between the electrodes of a given pair of successive electrodes, and the two signals of opposite polarities detected through the two pairs of successive electrodes adjacent to the given pair on opposite sides thereof are subtracted.