Surgery – Diagnostic testing – Measuring electrical impedance or conductance of body portion
Patent
1996-12-18
1998-06-30
Hindenburg, Max
Surgery
Diagnostic testing
Measuring electrical impedance or conductance of body portion
A61B 500
Patent
active
057726051
ABSTRACT:
There is provided a system and method for detecting facial symmetry of patients with hemiparesis, or unilateral facial palsy, by facial impedance measurement which quantifies lack of facial symmetry and thereby provides a program for therapeutic stimulus of paralyzed facial muscles. A mid-line of facial current is generated between an upper electrode above the eyes and a lower electrode on the chin, the facial current being sub-threshold so as to avoid any muscle stimulus. Impedance measurements are taken by determining the voltage between symmetrically placed facial electrodes, or between electrode pairs consisting of one electrode positioned around the eye, cheek or mouth, and a reference electrode placed on the patient's chin so as to provide an effective bottom point of the Wheatstone bridge formed by the face. The voltage measurements translate into impedance measurements which are indicative of muscle paralysis, and provide a simple but reliable method of obtaining objective data useful for facial movement assessment. Objective current can be either sinusoidal or a train of pulses. In one specific embodiment, the measurement subsystem comprises a sigma-delta loop which includes the patient's face as a signal domain; the phase of the injected current is modulated in a manner similar to the negative feedback branch of a standard sigma-delta loop circuit, thereby providing a digital output which is relatively free of signal artifacts.
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Hindenburg Max
Jaro Michael J.
Medtronic Inc.
Patton Harold R.
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