Anesthesia adequacy monitor and method
First Claim
1. A device for monitoring the consciousness of a patient under anesthesia comprising, in combination:
- an array of facial muscle sensors adapted to be strategically located on the patient to generate signals representing the activity of at least two facial muscles, said muscles being responsible for eliciting distinctive patterns of facial expressions,a processor for interpreting the patient'"'"'s awareness from comparison of measurements made by said sensors and operatively coupled to said sensors, wherein said processor includes a means for determining the facial expression of the patient by interpreting a signal created by said sensors, anda display with means receiving output from said processor for accurately communicating to an anesthesiologist the level of patient awareness and therefore consciousness;
whereby the anesthesiologist may monitor the patient'"'"'s consciousness and take corrective action to improve patient comfort when indicated.
1 Assignment
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Accused Products
Abstract
The anesthesia adequacy monitor measures the level of consciousness of a patient as distinguished from merely the physical paralysis of the patient. Sensors attached to the patient'"'"'s face measure the micro-expression the patient is exhibiting which is normally undetectable by even a trained observer. This device amplifies the patient'"'"'s expression and thereby provides both a quantative and a qualitative measure of the patient'"'"'s reactions to various stimuli during apparent unconsciousness. A display is provided giving an operator a readily discernable representation of the patient'"'"'s awareness. An artifact detector further enhances the device'"'"'s utility by filtering out unwanted anomalies from the monitor'"'"'s output. During surgery, this device can be used to maintain an adequate level of patient awareness while the patient is under anesthesia. After an event resulting in apparent unconsciousness, this device can provide a measure of the patient'"'"'s true level of awareness. In this way, patient comfort is maximized and patient recovery time is minimized.
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Citations
39 Claims
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1. A device for monitoring the consciousness of a patient under anesthesia comprising, in combination:
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an array of facial muscle sensors adapted to be strategically located on the patient to generate signals representing the activity of at least two facial muscles, said muscles being responsible for eliciting distinctive patterns of facial expressions, a processor for interpreting the patient'"'"'s awareness from comparison of measurements made by said sensors and operatively coupled to said sensors, wherein said processor includes a means for determining the facial expression of the patient by interpreting a signal created by said sensors, and a display with means receiving output from said processor for accurately communicating to an anesthesiologist the level of patient awareness and therefore consciousness; whereby the anesthesiologist may monitor the patient'"'"'s consciousness and take corrective action to improve patient comfort when indicated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A consciousness detector for informing an anesthesiologist of the level of consciousness of a patient under anesthesia through detection of the patient'"'"'s facial expression comprising, in combination:
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an array of facial muscle sensors adapted to be strategically located on the patient and generating signals relating to measurements of the activity of at least two facial muscles, said muscles being responsible for eliciting distinctive patterns of facial expressions, a signal processing system for interpreting the patient'"'"'s awareness coupled to said sensor array said signal processing system including a means for comparing said sensor signals, said signal processing system determining the facial expression of the patient by interpreting said sensor signals and converting a first signal representing raw sensor output from said sensors into a second signal representing output from said signal processing system reflective of the patient'"'"'s facial expression, and a display device operatively driven by said second signal; whereby when an unexpectedly high or unexpectedly low level of patient consciousness is detected the anesthesiologist may take corrective action. - View Dependent Claims (10, 11)
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12. A consciousness detector for informing an anesthesiologist of the level of consciousness of a patient under anesthesia through detection of the patient'"'"'s facial expression comprising, in combination:
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an array of facial muscle sensors adapted to be strategically located on the patient, a signal processing system coupled to said sensor array capable of converting a first signal representing raw sensor output from said sensors into a second signal representing output from said signal processing system reflective of the patient'"'"'s facial expression, and a display device operatively driven by said second signal; whereby when an unexpectedly high or unexpectedly low level of patient consciousness is detected the anesthesiologist may take corrective action, wherein an artifact detector and signal compensator are interposed between said array of sensors and said signal processing system such that when external electrical or physical forces are applied to the patient under anesthesia the direct effect of these external forces on the patient'"'"'s facial muscles and the indirect effect on said first signal is filtered out of said first signal;
whereby said first signal is shielded from distortion providing a more accurate representation of the patient'"'"'s facial expression in response to nerve stimulation,wherein said array of sensors is formed from a plurality of surface electromyographs, wherein said display device is a monitoring screen which displays a human face with indicia communicating the expression represented by said second signal;
whereby the patient'"'"'s expression may be monitored providing the anesthesiologist with an indication of the patient'"'"'s level of consciousness. - View Dependent Claims (13, 14)
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15. A method for maintaining an appropriate level of patient unconsciousness under anesthesia, the steps including:
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configuring an array of at least two sensors on a patient'"'"'s face, creating a signal with the sensors, processing the signal created by the sensors to determine what facial expression the signal represents by comparing the signals from different sensors, the signals being reflective of the patient'"'"'s facial muscle tonus, displaying the processed signal for viewing by an anesthesiologist on a display, anesthetizing the patient with an initial dosage of anesthetic to create muscle relaxation in a desired level of consciousness, and controlling the patient'"'"'s level of consciousness. - View Dependent Claims (16, 17, 18)
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19. A method for monitoring a patient'"'"'s level of consciousness through detection of a patient'"'"'s facial expression the steps including:
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attaching facial muscle sensors to the patient'"'"'s face, forming an electronic signal from the facial muscle sensor'"'"'s input, transforming the electric signal into a pictorial display of a face with the facial expression of the patient superimposed thereon, and magnifying the signal such that the facial expression experienced by the patient is easily noticeable by an operator. - View Dependent Claims (20)
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21. An anesthetized patient awareness and facial expression monitor comprising in combination:
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an array of facial muscle sensors adopted to be strategically located on the patient to generate signals representing the activity of at least two facial muscles, said muscles being responsible for eliciting distinctive patterns of facial expressions; signal processing means including awareness detection means and stress detection means, said signal processing means connected to said sensors and utilizing output from said sensors;
wherein said signal processing means includes a means for determining the facial expression of the patient by comparing the signals representing the activity of said at least two facial muscles, anddisplay means operatively coupled to receive the output from said sensors for communicating patients awareness and stress; whereby an anesthetized patient may be monitored during surgery to determine the adequacy of the anesthesia through analysis of the patient'"'"'s awareness and stress. - View Dependent Claims (22)
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23. A method for monitoring the depth and degree of anesthetization of a patient, the steps including:
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segregating into two groups muscles of the patient based on the muscle'"'"'s ability to respectively reflect pain or the absence of pain by change in muscle tonus, monitoring the activity of at least one muscle from each group, establishing a baseline for each muscle monitored prior to performing an operatory procedure, comparing the muscles monitored from each group for relative changes correlative of the patient experiencing pain during the operatory procedure said comparing step including quantifying muscle tonus values for each monitored muscle and calculating a difference between values of at least one muscle from each group to establish a measure of patient pain recognition, and displaying the comparison. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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30. A method for monitoring the depth and degree of anesthetization of a patient, the steps including:
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segregating into two groups muscles of the patient based on the muscle'"'"'s ability to respectively reflect pain or the absence of pain by change in muscle tonus, monitoring the activity of at least one muscle from each group, establishing a baseline for each muscle monitored prior to performing an operatory procedure, comparing the muscles monitored from each group for relative changes correlative of the patient experiencing pain during the operatory procedure; displaying the comparison; and wherein said comparing step includes calculating a ratio for each monitored muscle and calculating a difference between values of at least one muscle from each group to establish a measure of patient pain recognition. - View Dependent Claims (31, 32)
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33. An anesthesia monitor for measuring the depth and quality of patient anesthetization, comprising, in combination:
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at least one first sensor adapted to be operatively coupled to at least one patient'"'"'s muscle selected from a first group of muscles having a tonus which changes when a patient experiences pain, at least one second sensor adapted to be operatively coupled to at least one patient'"'"'s muscle selected from a second group of muscles having a tonus which changes when a patient experiences the absence of pain, signals emanating from said sensors, a signal processing means receiving said signals from said first sensors and said second sensors, said signal processing means having means to initialize said signals before said patient undergoes an operatory procedure, said signal processing means having means to measure changes in said signals, said signal processing means having means to compare said signals from said first sensors with said signals from said second sensors reflective of changes in the tonus and for determining the facial expression of the patient from said comparison; and a display means operatively coupled to said signal processing means for communicating the depth of the patient'"'"'s anesthetization; whereby a user may determine the depth and quality of patient anesthetization. - View Dependent Claims (34, 35, 36, 37, 38, 39)
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Specification