Patent ID: 8428674

Claim:
A near infrared spectrophotometric sensor assembly for non-invasive monitoring of blood oxygenation levels in a subject's body tissue, said assembly comprising: a pad; at least one light source operative to emit light signals of a plurality of different wavelengths through a source aperture within the pad; at least one light detector operative to detect light emitted by the light source and passed through the subject's body tissue; electromagnetic interference shielding disposed around at least a portion of the light detector; a detector housing including a base and a cap, wherein the base includes a well sized to receive at least a portion of the light detector, and the cap is sized to receive a remainder of the light detector and shielding not received within the base well; and wherein the base and the cap mate to enclose the light detector and shielding, and the housing is positioned relative to the pad so that the light detector is aligned with a light detector aperture disposed within the pad; wherein the base includes a window comprising an optically transparent material that allows light to pass there through and be sensed by the light detector.