A sensor may be adapted to account for factors that cause irregularities in sensor measurements. A sensor may selectively absorb light from outside sources. A sensor may selectively absorb light near a region of tissue having relatively large subcutaneous anatomic structures, such as large blood vessels,...http://www.google.com/patents/US7899510?utm_source=gb-gplus-sharePatent US7899510 - Medical sensor and technique for using the same
