PHYSIOLOGICAL PARAMETER SYSTEM
A physiological parameter system has one or more parameter inputs responsive to one or more physiological sensors. The physiological parameter system may also have quality indicators relating to confidence in the parameter inputs. A processor is adapted to combine the parameter inputs, quality indicators and predetermined limits for the parameters inputs and quality indicators so as to generate alarm outputs or control outputs or both.
1 . A patient monitor comprising:
a first input configured to receive a first parameter signal, said first parameter signal indicative of a first physiological parameter of a patient and said first parameter signal responsive to a first physiological sensor monitoring said patient;
a second input configured to receive a second parameter signal, the second parameter signal indicative of a second physiological parameter of the patient and responsive to a second physiological sensor monitoring said patient;
a processor responsive to said first and second inputs to determine trend data based on one or more of the first parameter signal and the second parameter signals and, to generate an alarm output based at least in part on said trend data; and
a pattern detector having a detection output responsive to said first parameter signal,
said diagnostic indication of a patient condition or alarm output responsive to said detection output and said trend data.
2 . The patient monitor according to claim 1 further comprising:
a slope detector output responsive to said second parameter signal to generate said trend data; and
a predetermined slope limit responsive to said slope detector output,
wherein said diagnostic indication of a patient condition or alarm output is triggered only if said slope detector output exceeds said slope limit.
3 . The patient monitor according to claim 2 wherein:
said first parameter signal comprises values responsive to an ETCO 2 of the patient;
said second parameter signal comprises values responsive to an SpO 2 of the patient; and
said diagnostic indication of a patient condition or alarm output is responsive to ETCO 2 morphology only when there is a sufficient downward trend in SpO 2 .
4 . A physiological parameter system comprising:
a trend data input relating to trend data of a parameter, the parameter responsive to a physiological sensor;
a quality indicator input relating to confidence in said trend data input;
a plurality of predetermined limits for said trend data input and said quality indicator input; and
a processor adapted to combine said inputs and said limits so as to generate a control output.
5 . The physiological parameter system according to claim 4 wherein said control output disables patient controlled analgesia when confidence in said trend data input is low.
6 . The physiological parameter system according to claim 5 wherein said control output prevents said trend data input from disabling patient controlled analgesia when said quality indicator indicates confidence is low.
7 . A physiological parameter method comprising the steps of:
inputting trend data related to a parameter, the parameter responsive to a physiological sensor;
inputting a quality indicator related to data confidence for said trend data;
outputting a control signal from the combination of said trend data and said quality indicator,
wherein said control signal is adapted to affect the operation of a medical-related device.
8 . The physiological parameter method according to claim 7 wherein said trend data and said quality indicator are derived from a pulse oximetry sensor, said outputting step comprising the substeps of:
configuring said control signal to conditionally disable said medical-related device;
regulating said control signal in response to said quality indicator.
9 . The physiological parameter method according to claim 8 wherein said regulating substep comprises the substep of disabling a shut-off signal when confidence in said trend data is low.
10 . The physiological parameter method according to claim 9 wherein said regulating substep comprises the substep of enabling a shut-off signal when confidence in said trend data is high.