Support surface overlay with acoustic patient detection

The acoustic sensor system serves multiple functions: detecting patient presence, monitoring usage patterns, and determining when the overlay is in use. This multi-functionality justifies the added complexity by consolidating multiple monitoring capabilities into a single integrated system rather than requiring separate mechanisms for each function.

The patent replaces complex mechanical weight-sensing mechanisms with acoustic detection. Instead of using mechanical scales, pressure sensors, or complex mechanical linkages to detect patient presence, the system uses acoustic sensors to listen for sounds generated by patient movement or presence, thereby detecting mechanical states through acoustic fields rather than direct mechanical measurement.

The overlay system monitors its own usage autonomously through acoustic sensors that detect patient presence and movement patterns. The processor automatically analyzes acoustic data to determine usage duration and patterns, eliminating the need for manual tracking or external monitoring systems. This self-monitoring capability enables the system to track its own service life without requiring additional manual intervention or complex external infrastructure.

The system uses acoustic parameters (sound frequency, amplitude, duration) to infer usage conditions and determine when the overlay has been sufficiently used or abused. By monitoring changes in acoustic characteristics over time, the system can assess wear patterns and service life without requiring physical inspection or complex mechanical counters, thereby extending usable service life through data-driven maintenance scheduling.