An implantable medical device for monitoring tissue perfusion that includes a light source emitting light having a light wavelength corresponding to a blue to ultraviolet light spectrum and a light detector receiving light emitted by the light source and scattered by a volume of body tissue. The light...http://www.google.de/patents/US8165676?utm_source=gb-gplus-sharePatent US8165676 - Optical sensor and method for detecting a patient condition
