Calibration of force sensitive sensor device during its life cycle

A patient monitoring device comprising:

• a dynamic force sensor configured to produce a charge output in response to applied force or vibration;
• a computing unit operatively connected to the dynamic force sensor;
• a memory associated with the computing unit, the memory storing signal processing software and gain optimizer software;
• and
• a communications device for transmitting processed data,
• wherein the device is configured to sense patient presence, vital signs, or occupancy in a bed or chair by processing signals from the dynamic force sensor to account for signal variability due to sensor location, cushioning, patient characteristics, or environmental noise.

A method of monitoring a patient using a dynamic force sensor device, the method comprising the steps of:

• placing the dynamic force sensor device in or on a bed or chair;
• acquiring a force-sensitive signal from the dynamic force sensor in response to patient-induced vibrations;
• processing the signal using signal processing software to determine patient presence, vital signs, or occupancy;
• dynamically calibrating the signal to compensate for variability due to patient-to-patient characteristics, sensor location, or environmental conditions;
• and
• transmitting the processed data via a communications device.

A system for monitoring vital signs in a healthcare environment, comprising:

• one or more dynamic force sensors placed under or between cushioning in a bed or chair;
• a computing unit configured to process signals from the one or more dynamic force sensors;
• a memory storing software for signal processing, gain optimization, and dynamic calibration;
• and
• a communications interface for outputting monitoring data,
• wherein the system compensates for signal output variability caused by sensor aging, patient weight, bed material, or noise sources through continuous dynamic calibration.