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We present a novel normal and shear force sensor by using liquid metal alloy (Ga-In-Sn) as piezoresistive gauge material encapsulated in a polydimethylsiloxane (PDMS) substrate. By using liquid metal alloy as gauge material, it can detect large forces without breaking the sensor wires. Since the liquid-metal piezoresistors deform with the elastomeric substrate, shear and normal forces can be detected...
Articular cartilage is a thin but crucial tissue layer which plays an important role in diarthrodial joints. During the last decade, the quantitative ultrasound technique, especially the high frequency ultrasound elasticity measurement technique, called as ultrasound elastomicroscopy (UEM), has been widely employed as a versatile modality to investigate the articular cartilage. Ultrasound elastomicroscopy...
Many trauma and reconstructive surgeries involve the re-establishment of bone-tendon junction (BTJ) tissues. A direct BTJ repair requires a long period of immobilization which may be associated with a postoperative weak knee. To enhance the tissue healing, researchers use postoperative mechanical stimulation, such as low intensity pulsed ultrasound (LIPUS), to accelerate the BTJ repair and the restoration...
The skeletal muscle plays a very important role in the human movement. Surface electromyography (SEMG) is a very useful tool for the functional assessment of skeletal muscles, while sonography has been commonly used to detect its morphological information. We named the signal about the muscle morphological changes derived from ultrasound as sonomyography (SMG). In this study, the ultrasound image,...
Surface electromyography (SEMG) is widely used for the functional assessment of skeletal muscles, while sonography has been commonly used to detect its morphological information. We defined the signal about the continuous change of the morphological parameters of muscles detected by ultrasound as sonomyography (SMG). In this study, we continuously sampled the ultrasound image, SEMG signals on the...
Surface electromyography (SEMG) is widely used for the functional assessment of skeletal muscles, while sonography has been commonly used to detect its morphological information. We defined the signal about the continuous change of the morphological parameters of muscles detected by ultrasound as sonomyography (SMG). In this study, we continuously sampled the ultrasound image, SEMG signals on the...
The mechanical properties of skeletal muscles are always related to its architectural changes. But at present, there are very few documents that report the comprehensive study on skeletal muscle with structure morphology, mechanics, electrophysiology and so on. This paper introduced that the muscle thickness and surface electromyography (SEMG) sampled from the extensor carpi radialis by the ultrasound...
Tissue stiffness is generally known to be associated with pathologic changes. Ultrasound indentation is able to assess the mechanical properties of soft tissues. Conventional ultrasound indentation devices use rigid flat-ended transducers to directly contact with the tissues and typically operate in the frequency ranging between 2 M Hz and 10 MHz. This paper introduced a novel ultrasound indentation...
Ultrasound and electromyography (EMG) are two of the most often used diagnostic tools for muscles. However, there is lack of a system for continuously capturing both signals with a synchronized procedure. This study presents a new system for this purpose. The system comprises an ultrasound scanner, a pulser/receiver, an EMG amplifier, and a PC with A/D converter cards for data acquisition and analysis...
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