Automatic medical sign monitor
First Claim
Patent Images
1. An automatic medical sign monitor comprising:
- a medical sign sensor for collecting a time ordered set of medical sign data;
a medical sign data processor coupled to said medical sign sensor for detecting a change in health state by forming statistics from said medical sign data comprising;
a fast initial response (FIR) Shewhart cumulative sum modified to include;
a Shewhart statistic having a first upper threshold and a first lower threshold selected to result in a probability of false alarm substantially equal to a reciprocal of an average run length,a fast initial response cumulative sum having a second upper threshold and a second lower threshold selected to result in a probability of false alarm substantially equal to said reciprocal of said average run length for detecting a shift in mean value,and a second cumulative sum for estimating a current mean value and an elapsed time of said shift in mean value;
and a variance cumulative sum modified to detect a shift in variance and to estimate a current variance value and an elapsed time of said shift in variance, and to include a third upper threshold and a third lower threshold selected to result in a probability of false alarm substantially equal to said reciprocal of said average run length;
and an output device coupled to said data processor for outputting at least one of said medical sign data and said statistics.
1 Assignment
0 Petitions
Accused Products
Abstract
An automatic medical monitor of the present invention comprises medical s sensors for collecting a time-ordered set of values representative of medical signs such as pulse, respiration, and blood pressure. The medical sign sensors are coupled to a medical sign data processor that forms statistics from the medical sign data and forms a modified Fast Initial Response (FIR) Shewhart cumulative sum and a variance cumulative sum to detect changes in health state. When a change in health state is detected, the medical sign data processor displays the statistics on a display and logs them on a printer.
-
Citations
14 Claims
-
1. An automatic medical sign monitor comprising:
-
a medical sign sensor for collecting a time ordered set of medical sign data; a medical sign data processor coupled to said medical sign sensor for detecting a change in health state by forming statistics from said medical sign data comprising; a fast initial response (FIR) Shewhart cumulative sum modified to include; a Shewhart statistic having a first upper threshold and a first lower threshold selected to result in a probability of false alarm substantially equal to a reciprocal of an average run length, a fast initial response cumulative sum having a second upper threshold and a second lower threshold selected to result in a probability of false alarm substantially equal to said reciprocal of said average run length for detecting a shift in mean value, and a second cumulative sum for estimating a current mean value and an elapsed time of said shift in mean value; and a variance cumulative sum modified to detect a shift in variance and to estimate a current variance value and an elapsed time of said shift in variance, and to include a third upper threshold and a third lower threshold selected to result in a probability of false alarm substantially equal to said reciprocal of said average run length; and an output device coupled to said data processor for outputting at least one of said medical sign data and said statistics. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method for automatically monitoring medical signs comprising the steps of:
-
sensing medical signs to form a time ordered set of medical sign data; detecting a change in health state by forming statistics from the medical sign data comprising; a fast initial response (FIR) Shewhart cumulative sum modified to include; a Shewhart statistic having a first upper threshold and a first lower threshold selected to result in a probability of false alarm substantially equal to a reciprocal of an average rim length, a fast initial response cumulative sum having a second upper threshold and a second lower threshold selected to result in a probability of false alarm substantially equal to the reciprocal of the average run length for detecting a shift in mean value, and a second cumulative sum for estimating a current mean value and an elapsed time of said shift in mean value; and a variance cumulative sum modified to detect a shift in variance and to estimate a current variance value and an elapsed time of the shift in variance, and to include a third upper threshold and a third lower threshold selected to result in a probability of false alarm substantially equal to the reciprocal of the average run length; and outputting at least one of the medical sign data and the statistics. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
Specification