Apparatus for performing multiwavelength photoplethysmography
Noninvasive medical monitoring instrument using surface emitting laser devices Patent #: 6253097
ApplicationNo. 10/104316 filed on 03/22/2002
US Classes:600/322, Determining blood constituent600/323, Oxygen saturation, e.g., oximeter600/344Mounting structure (e.g., belt, etc.)
ExaminersPrimary: Winakur, Eric F.
Assistant: McCrosky, David J.
International ClassA61B 5/00 (20060101)
AbstractA hybrid optical system for photoplethysmographic measurements is disclosed. The system delivers light from a plurality of emitters to the tissue-under-test. A set of one or more of the emitters resides in close proximity to the sensor. A second set of one or more emitters resides at some distance from the sensor with the light from this second set of emitters being delivered to the sensor by a light pipe typically consisting of a fiber optic cable. This invention allows the photoplethysmographic instrument designer to use two or more different types of emitters in the same photoplethysmographic device while still generating a technically feasible and cost effective design.