Automatic pressure range and sensitivity adjustment
AssigneeMedtronic, Inc.
InventorsCurtis A. Hale, Kathleen A. Prieve
Life of this patent
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Abstract
The invention automatically adjusts the parameters that map pressures at a monitoring site, such as blood pressures in the chamber of a heart, to digital values. Adjusting the mapping parameters keeps the data in range while preserving sensitivity. A histogram of the digital pressure data is generated and the contents of the lowest and highest bins of the histogram are checked. Depending on whether the boundary bins of the histogram are full or empty, the mapping parameters are adjusted. A new histogram is generated using digital values generated with the adjusted mapping parameters.
Claims38
A method comprising:
- mapping a set of blood pressures to a set of discrete binary values with first mapping parameters, wherein the first mapping parameters comprise a maximum binary value that corresponds to a maximum blood pressure and a minimum binary value that corresponds to a minimum blood pressure;
- generating a histogram with the set of discrete binary values;
- and
- generating second mapping parameters as a function of the contents of the lowest bin and the highest bin of the histogram.
A computer-readable medium comprising instructions for causing a programmable processor to:
- map a set of blood pressures to a set of discrete binary values with a first set of mapping parameters, wherein the first set of mapping parameters comprises a maximum binary value that corresponds to a maximum blood pressure and a minimum binary value that corresponds to a minimum blood pressure;
- generate a histogram with the set of discrete binary values;
- and
- generate a second mapping parameters as a function of the contents of the lowest bin and the highest bin of the histogram.
A device comprising:
- an amplifier that generates pressure signals as a function of pressure sensed by a pressure sensor in a body, the amplifier responsive to mapping parameters;
- an analog-to-digital converter that converts the pressure signals to a set of discrete binary values;
- and
- a controller that generates a first histogram as a function of a distribution of a first set of binary values and first mapping parameters and that generates second mapping parameters as a function of the distribution of data in the first histogram.
A method comprising:
- receiving analog pressure data;
- mapping the analog pressure data to discrete binary values with first mapping parameters;
- generating a first histogram as a function of the distribution of the discrete binary values during a storage interval;
- and
- after the storage interval, generating second mapping parameters as a function of the contents of the lowest bin and the highest bin of the histogram.
Dependencies are inferred from the claim text.