Method and apparatus for monitoring eye tremor

Abstract

An apparatus consistent with the present invention comprises a sensor for receiving a signal representing eye tremor and a processor for monitoring eye tremor while receiving the signal. A method consistent with the present invention includes receiving a signal representing eye tremor, comparing the received signal representing eye tremor to at least one reference value, and classifying a patient's brain stem function using the comparison of the received signal representing eye tremor to at least one reference value. An embodiment consistent with the present invention includes an ocular micro tremor (OMT) sensor and associated signal processing hardware and software for clinical analyses

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates generally to signal processing systems and methods, and more particularly to systems that monitor eye tremor signals. [0002] This application claims priority to Provisional U.S. Patent Application entitled “Method and Apparatus for Monitoring Eye Tremor,” Ser. No. 60 / 252,429, filed Nov. 22, 2000, and is herein incorporated by reference in its entirety. [0003] Presently the diagnosis of brain stem death is made by judging clinical criteria alone such as pupillary response to light, corneal reflex, absent motor response with painful stimulus to both trigeminal distribution and periphery, gag reflex, cough reflex, oculocephalic reflex, vestibulo ocular reflex and apnoea test. Clinical evidence alone, which is subject to human error, may not be sufficient to establish such an important diagnosis as brain stem death. Research effort in recent years has been directed to the problem of early prognosis in coma. Accurate early ...

AI Technical Summary

Benefits of technology

[0007] An embodiment of the present invention is a low cost, and potentially disposable, miniature OMT sensor for monitoring eye tremor through the closed eyelid. An embodiment of the present invention uses signal conditioning circuitry in a manner that can reduce artifacts that could result from electromagnetic interference (EMI). An embodiment consistent with the present invention includes a signal processing module which acquires, analyzes, and displays OMT data with minimal input or attendance by clinical personnel.

Problems solved by technology

Clinical evidence alone, which is subject to human error, may not be sufficient to establish such an important diagnosis as brain stem death.

These methods, however, have not had a widespread impact on clinical management of comatose patients, as the likelihood of false prediction is as high as 20%.

A variety of clinical monitors have also been used in order to assess depth of anesthesia and other brain stem activity including, for example, autonomic signs, EEG, isolated forearm technique, auditory evoked responses, oesophageal contractility and surface EMG, but each method has its limitations.

The presence or absence of these responses does not, however, correlate with conscious awareness and at times they can be inadequate indicators of a satisfactory depth of anesthesia.

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