Method and circuit for storing and providing historical physiological data

1. An oximeter system, comprising:

an oximeter sensor configured to generate signals indicative of a physiological parameter;

a memory storing a value of skin temperature at which a motion signal algorithm can be accurately utilized, wherein the memory is a component of the oximeter sensor; and

an oximeter monitor configured to receive the value of skin temperature from the memory of the oximeter sensor and to compare a measured value of skin temperature to the value of skin temperature to determine whether the motion signal algorithm can be accurately utilized.

2. The oximeter system of claim 1 , comprising a temperature monitor configured to measure a patient's skin temperature for comparison with the stored values of skin temperature.

3. The oximeter system of claim 1 , wherein the oximeter monitor is configured to use the motion signal algorithm to calculate a physiological parameter from the signals without a discernible cardiac pulse based on a determination that the motion signal algorithm can be accurately utilized.

4. A method of manufacturing an oximeter system, comprising:

providing an oximeter sensor configured to generate signals indicative of a physiological parameter, wherein the oximeter sensor comprises a memory;

storing in the memory a value of skin temperature at which a motion signal algorithm can be accurately utilized; and

providing an oximeter monitor configured to receive the value of skin temperature from the memory of the oximeter sensor and to compare a measured value of skin temperature to the value of skin temperature to determine whether the motion signal algorithm can be accurately utilized.

5. The method of claim 4 , comprising providing a temperature monitor configured to measure a patient's skin temperature for comparison with the stored value of skin temperature.

6. The method of claim 4 , wherein the oximeter monitor is manufactured to be configured to use the motion signal algorithm to calculate a physiological parameter from signals without a discernible cardiac pulse based on a determination that the motion signal algorithm can be accurately utilized.

7. An oximeter system, comprising:

an oximeter sensor, comprising:

a light emitting element configured to emit light into tissue;

a light detector configured to detect the light from the tissue and to generate signals indicative of a physiological parameter; and

a memory storing a value of skin temperature at which a motion signal algorithm can be accurately utilized; and

an oximeter monitor, comprising:

a drive circuit configured to provide signals to the light emitting element of the oximeter sensor;

a receiving circuit configured to receive the physiological signals from the light detector and to receive data including the value of skin temperature from the oximeter sensor for comparison with a measured value of skin temperature; and

a temperature monitor configured to measure a patient's skin temperature and to compare the measured value of skin temperature to the value of skin temperature to determine whether the motion signal algorithm can be accurately utilized.

8. The system of claim 7 , wherein the oximeter monitor is configured to use the motion signal algorithm to calculate a physiological parameter from the signals without a discernible cardiac pulse based on a determination that the motion signal algorithm can be accurately utilized.

9. An oximeter monitor, comprising:

a drive circuit configured to provide signals to circuitry of an oximeter sensor; and

a circuit configured to receive from a memory of the oximeter sensor a value of skin temperature at which a motion signal algorithm can be accurately utilized; and

a read circuit configured to receive a temperature reading from a thermometer of the oximeter sensor and to compare the temperature reading to the value of skin temperature to determine whether the motion signal algorithm can be accurately utilized.

10. The monitor of claim 9 , wherein the oximeter monitor is configured to use the motion signal algorithm to calculate a physiological parameter from signals without a discernible cardiac pulse based on a determination that the motion signal algorithm can be accurately utilized.

11. A method of monitor operation, comprising:

providing signals to circuitry of an oximeter sensor;

receiving information from a memory of the oximeter sensor, the information comprising a value of skin temperature at which a motion signal algorithm can be accurately utilized; and

comparing a measured value of skin temperature to the value of skin temperature to determine whether the motion signal algorithm can be accurately utilized.

12. The method of claim 11 , wherein if the motion signal algorithm can be utilized, using the motion signal algorithm to calculate a physiological parameter from signals without a discernible cardiac pulse.

13. A method of operating an oximeter system, comprising:

storing a value of skin temperature at which a motion signal algorithm can be accurately utilized in a memory of an oximeter sensor;

providing the value of skin temperature in the memory of the oximeter sensor to an oximeter monitor from the oximeter sensor; and

comparing a measured value of skin temperature to the value of skin temperature to determine whether the motion signal algorithm can be accurately utilized.

14. The method of claim 13 , comprising measuring an actual skin temperature of a patient with a thermometer.