#8309. A sensor to monitor limb depth in transtibial sockets with locking pin suspension: a technical note

October 2026publication date
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Medicine (all);
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Abstract:
BACKGROUND: Monitoring of limb depth in transtibial sockets may provide useful information toward patient education and care. OBJECTIVE: The objective was to develop a sensor to detect the depth of a locking pin in the shuttle lock of a transtibial socket and to monitor the small motions between ratchet clicks during ambulation. STUDY DESIGN: Controlled bench testing and single-participant study. METHODS: A copper wire coil positioned beneath the socket shuttle lock was used with an inductive sensing chip to monitor locking pin depth. A custom jig was used to calibrate the sensor and bench test the system. Repeatability, drift, and the effects of pin length, carbon fiber presence, temperature change, and pin angulation on sensor performance were tested. Testing was conducted on a participant wearing an adjustable socket, walking with the panels at four different radial positions.
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