US Patent 8942776 Physiological monitoring methods

A method of monitoring a subject includes attaching a sensor module having at least one optical emitter and detector to a body of the subject, delivering light from the at least one optical emitter into the body of the subject via a first light guide that is in optical communication with the at least one optical emitter, and collecting light from the body of the subject via a second light guide that is in optical communication with the at least one optical detector. The first light guide has a proximal end optically coupled to the at least one optical emitter and delivers light from the at least one optical emitter via a distal end thereof. The second light guide has a proximal end optically coupled to the at least one optical detector and collects light from the body of the subject via the distal end thereof.