Contoured protrusion for improving spectroscopic measurement of blood constituents

摘要

A noninvasive physiological sensor for measuring one or more physiological parameters of a medical patient can include a bump interposed between a light source and a photodetector. The bump can be placed in contact with body tissue of a patient and thereby reduce a thickness of the body tissue. As a result, an optical pathlength between the light source and the photodetector can be reduced. In addition, the sensor can include a heat sink that can direct heat away from the light source. Moreover, the sensor can include shielding in the optical path between the light source and the photodetector. The shielding can reduce noise received by the photodetector.

主权项

1. A multi-stream emitter for a noninvasive, physiological device configured to transmit optical radiation in a tissue site, said emitter comprising:
a submount comprising a base surface; a first surface perpendicular to the base surface; a second surface perpendicular to the first surface and the base surface; a top-emitting diode affixed on the first surface and configured to transmit first infrared optical radiation in a first direction perpendicular to the first surface and into a tissue site of a patient; a side-emitting diode affixed on the second surface and configured to transmit second infrared optical radiation in a second direction parallel to the second surface and into the tissue site of the patient, wherein the side-emitting diode is configured to transmit the second infrared optical radiation at a power between 40 mW to 100 mW and at a wavelength between 1600 nm to 1800 nm, and wherein the side-emitting diode is larger than the top-emitting diode; a heat sink thermodynamically coupled to the top-emitting diode and the side-emitting diode; and at least one thermistor configured to detect a temperature of at least one of the optical sources, the top-emitting diode and the side-emitting diode positioned on the submount such that the first and the second infrared optical radiation are generally aligned toward the tissue site of the patient.