Automatic medical sign monitor
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorJamie K. Pugh
Life of this patent
Estimating the term…
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.
Claims14
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.
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.
Dependencies are inferred from the claim text.