公开(公告)号：DE69633063T2

公开(公告)日：2005-09-01

申请号：DE69633063

申请日：1996-10-18

Applicant: ASPECT MEDICAL SYSTEMS INC

Inventor： DEVLIN H ,  CHAMOUN G ,  SHAMBROOM R ,  BRUCKNER E ,  MARCUS A

IPC: A61B5/274 ,  A61B5/308 ,  A61B18/14 ,  H01R29/00 ,  A61B5/0428 ,  A61B5/0416 ,  A61B5/0478

Abstract: Disclosed is a physiological electrical signal connector system which one connector connected to an electrode set and another connector connected to a digital signal convertor which leads to a patient monitor. Each type of electrode set has a specific code identified with it and when connected to the digital signal convertor, the connector code is recognized by the digital signal convertor. The connector code is then relayed to the monitor which will self-configure based on the identified code.

公开(公告)号：DE69530768D1

公开(公告)日：2003-06-18

申请号：DE69530768

申请日：1995-06-08

Applicant: ASPECT MEDICAL SYSTEMS INC

Inventor： CHAMOUN G ,  SIGL C ,  SMITH P

IPC: A61B5/16 ,  A61B5/374 ,  G06F17/00 ,  G06F19/00 ,  A61B5/04

Abstract: Disclosed is a system and method to derive a diagnostic index indicative of a selected cerebral phenomena which obtains 19 unipolar EEG signals from regions of interest on both the left and right hemispheres of a subject's brain. The system uses high-gain, low-noise amplifiers to maximize the dynamic range for low energy wave components of the signals. Band-pass filtering is used to reduce noise and to avoid aliasing. The system applies commonly used digital signal processing (DSP) techniques to digitize, to low-pass filter (100 Hz), and to decimate the signals. Power spectral, bispectral, and higher-order spectral processing is then performed. In a preferred embodiment, the system divides the most recent 63 seconds of digitized EEG data from each lead into 60 4-second intervals, each with 3 seconds of overlap with the previous interval. For a selected set of derived leads, the system produces auto power spectrum, autobispectrum, and auto higher-order spectrum variables, by using either a Fast Fourier Transform (FFT) based approach or a parametric approach. Any pair of leads can be combined to compute cross power spectrum, cross bispectrum, and cross higher-order spectrum variables. The spectral values are separated into bins and a value representative of the bin is selected or computed and then each value is multiplied by a predetermined coefficient. The resulting products are summed to arrive at the diagnostic index.

公开(公告)号：DE69633063D1

公开(公告)日：2004-09-09

申请号：DE69633063

申请日：1996-10-18

Applicant: ASPECT MEDICAL SYSTEMS INC

Inventor： DEVLIN H ,  CHAMOUN G ,  SHAMBROOM R ,  BRUCKNER E ,  MARCUS A

IPC: A61B5/274 ,  A61B5/308 ,  A61B18/14 ,  H01R29/00 ,  A61B5/0428 ,  A61B5/0416 ,  A61B5/0478

Abstract: Disclosed is a physiological electrical signal connector system which one connector connected to an electrode set and another connector connected to a digital signal convertor which leads to a patient monitor. Each type of electrode set has a specific code identified with it and when connected to the digital signal convertor, the connector code is recognized by the digital signal convertor. The connector code is then relayed to the monitor which will self-configure based on the identified code.

公开(公告)号：DE69530768T2

公开(公告)日：2004-03-18

申请号：DE69530768

申请日：1995-06-08

Applicant: ASPECT MEDICAL SYSTEMS INC

Inventor： CHAMOUN G ,  SIGL C ,  SMITH P

IPC: A61B5/16 ,  A61B5/374 ,  G06F17/00 ,  G06F19/00 ,  A61B5/04

Abstract: Disclosed is a system and method to derive a diagnostic index indicative of a selected cerebral phenomena which obtains 19 unipolar EEG signals from regions of interest on both the left and right hemispheres of a subject's brain. The system uses high-gain, low-noise amplifiers to maximize the dynamic range for low energy wave components of the signals. Band-pass filtering is used to reduce noise and to avoid aliasing. The system applies commonly used digital signal processing (DSP) techniques to digitize, to low-pass filter (100 Hz), and to decimate the signals. Power spectral, bispectral, and higher-order spectral processing is then performed. In a preferred embodiment, the system divides the most recent 63 seconds of digitized EEG data from each lead into 60 4-second intervals, each with 3 seconds of overlap with the previous interval. For a selected set of derived leads, the system produces auto power spectrum, autobispectrum, and auto higher-order spectrum variables, by using either a Fast Fourier Transform (FFT) based approach or a parametric approach. Any pair of leads can be combined to compute cross power spectrum, cross bispectrum, and cross higher-order spectrum variables. The spectral values are separated into bins and a value representative of the bin is selected or computed and then each value is multiplied by a predetermined coefficient. The resulting products are summed to arrive at the diagnostic index.

公开(公告)号：DE69904836T2

公开(公告)日：2003-11-13

申请号：DE69904836

申请日：1999-08-04

Applicant: ASPECT MEDICAL SYSTEMS INC

Inventor： CHAMOUN G ,  DEVLIN H

IPC: A61B5/0452 ,  A61B5/0476 ,  A61B5/0488 ,  A61B10/00 ,  G06F17/14 ,  G06F17/00 ,  A61B5/00

Abstract: Disclosed is a system and method for providing information to the user of a medical monitoring or diagnostic device to aid in the clinical decision making process. The preferred embodiment uses two estimators or predictors of the same physiological quantity, with each of the estimators being designed to detect specific states or artifacts in the estimated parameter and thus operating at a different point on its respective ROC curve; one chosen to provide high sensitivity, the other chosen to provide high specificity. The divergence between the estimators is indicated by the use of a shaded region between their respective time trends. The use of 2 estimators of the same parameters with different performance characteristics allows the system and method of the present invention to derive additional information about the underlying physiologic process over and above that which would be available from a single estimator. The system and method of the present invention can derive information from not only the instantaneous values of the estimators and the difference between them, but also from the time trend of the difference.

公开(公告)号：DE69904836D1

公开(公告)日：2003-02-13

申请号：DE69904836

申请日：1999-08-04

Applicant: ASPECT MEDICAL SYSTEMS INC

Inventor： CHAMOUN G ,  DEVLIN H

IPC: A61B5/0452 ,  A61B5/0476 ,  A61B5/0488 ,  A61B10/00 ,  G06F17/14 ,  G06F17/00 ,  A61B5/00

Abstract: Disclosed is a system and method for providing information to the user of a medical monitoring or diagnostic device to aid in the clinical decision making process. The preferred embodiment uses two estimators or predictors of the same physiological quantity, with each of the estimators being designed to detect specific states or artifacts in the estimated parameter and thus operating at a different point on its respective ROC curve; one chosen to provide high sensitivity, the other chosen to provide high specificity. The divergence between the estimators is indicated by the use of a shaded region between their respective time trends. The use of 2 estimators of the same parameters with different performance characteristics allows the system and method of the present invention to derive additional information about the underlying physiologic process over and above that which would be available from a single estimator. The system and method of the present invention can derive information from not only the instantaneous values of the estimators and the difference between them, but also from the time trend of the difference.