We report on the development of a flexible 2D optical fiber-based pressure sensing surface suitable for biomedical applications. The sensor comprises of highly-sensitive Fiber Bragg Grating elements embedded in a thin polymer sheet to form a 2x2 cm(2) sensing pad with a minimal thickness of 2.5mm, while it is easily expandable in order to be used as a building block for larger surface sensors. The fabricated pad sensor was combined with a low physical dimension commercially available interrogation unit to enhance the portability features of the complete sensing system. Sensor mechanical properties allow for matching human skin behavior, while its operational performance exhibited a maximum fractional pressure sensitivity of 12 MPa(-1) with a spatial resolution of 1x1cm(2) and demonstrated no hysteresis and real time operation. These attractive operational and mechanical properties meet the requirements of various biomedical applications with respect to human skin pressure measurements, including amputee sockets, shoe sensors, wearable sensors, wheelchair seating-system sensors, hospital-bed monitoring sensors.

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An adaptable bedding surface for the prophylaxis and treatment of decubitus ulcers was developed and evaluated in a number of preclinical studies. The new bed reduced the average contact pressure peaks in prolonged supine bed rest while significantly decelerating the onset and progression of pressure sores. A special advantage of the surface is its discrete, independently-mobile pin elements that allow localized implementation of sensors and diagnostic tools in the bed structure. The bed is currently being evaluated in clinical trials with at series of different patient populations with different pressure ulcer pathologies. The system's overall ability to prevent the conditions that contribute to the onset of ulcers as indicated by improvements on the ulcer incidence rate is presented here.

Daily volume loss of the residual limp is reported as one of the greatest challenges in socket fitting. Assisted vacuum socket systems were developed to prevent stump's volume loss and maintain sufficient socket fit. There is however very little quantitative biomechanical research for the evaluation of below knee sockets with assisted vacuum systems. Highly accurate in-vivo measurements became recently available using high-speed, high resolution Biplane Dynamic Rontgen Stereogrammetric Analysis (DRSA) instrumentation. This study presents the first effort to evaluate the efficiency of the vacuum assisted liner socket using DRSA. This in-vivo patient specific information is highly accurate and can significantly influence the iterative cycle of trans-tibial socket fitting and evaluation.

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