Abstract: An apparatus and method for non-invasively determining the blood oxygen saturation within a subject's tissue by near-infrared spectroscopy is disclosed. Embodiments of the apparatus and method use the multi-distance method and take into account the attenuation of the light signal due to light absorbers other than hemoglobin and deoxyhemoglobin and the scattering properties of a subject's tissue.

Abstract: An apparatus and method for non-invasively determining the blood oxygen saturation within a subject's tissue by near-infrared spectroscopy is disclosed. Embodiments of the apparatus and method use the multi-distance method and take into account the attenuation of the light signal due to light absorbers other than hemoglobin and deoxyhemoglobin and the scattering properties of a subject's tissue.

Abstract: A catheter for measuring a flow of blood through a body tissue comprises a light emitter for emitting light into the body tissue and at least one light receiver for receiving light reflected in the body tissue and back to the catheter. The light emitter and the at least one light receiver are arranged in the catheter, wherein the catheter comprises a middle piece and a first and a second connection tube. The middle piece has a distal fastening piece for fastening to the first connection tube and a proximal fastening piece for fastening to the second connection tube, wherein the light emitter and the at least one light receiver are arranged in the middle piece.

Abstract: An assistive mobility device is provided that includes an automatic positive locking system, which permits an operator to move the assistive mobility device when an actuator is engaged and automatically lock the assistive mobility device when the actuator is disengaged. The assistive mobility device includes a braking system, stowable footrest and armrests, and an adjustable back, which all require the single-handed operation of the operator to function. The collapsible footrest is stowed under the seat permitting an occupant optimal entry into or exit from the assistive mobility device. The assistive mobility device can be formed from non-corrosive materials, including stainless steel, composite fibers, nylon, and plastics, for use in aquatic environments.