Development of a digital dual-channel pressure biofeedback unit: a proof-of-concept for clinically driven re-engineering

The monitoring of lumbopelvic therapeutic exercise has traditionally relied on commercial pressure biofeedback units limited to single-channel analogue systems. Consequently, the translation of an integrated approach capable of simultaneously assessing transvaginal and external abdominal pressure dynamics into routine clinical practice has remained limited. To address this limitation, the present study introduces a proof-of-concept digital architecture designed to integrate two distinct pressure-monitoring interfaces within a synchronised, low-cost platform. Utilising a PIC16F1789 microcontroller and dual differential pressure sensors, the system features continuous wireless telemetry and a transparent R-based interface. A comprehensive comparator-based static bench characterisation (20–100 mmHg) demonstrated a high degree of linearity (R2 > 0.99), with a mean absolute error of less than 1.1 mmHg and an inter-channel standard deviation of 0.72 mmHg. The architecture yielded a reliable dual-channel effective frame rate of approximately 39 Hz. While this prototype currently functions as a robust bench-level demonstrator rather than a clinically validated diagnostic tool, it provides an open-hardware blueprint for the engineering community. This foundation may support future investigation of time-aligned pressure monitoring and its potential relevance to lumbopelvic rehabilitation.