Principles Of Operation; Pulse Oximetry Measurement - Henry Schein HS-Vet Instructions For Use Manual

8 Principles of Operation

The Oximeter adopts non-invasive double wavelength to measure
SpO and PR. It can perform spot and continuous measurement for
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a short time.
The system consists of Central Processing Unit, Signal Collection,
Signal Input, Data Output, Display and User Input module, shown
as follows:
Figure 8-1 System Principle
The oximeter communicates with external devices through
RS-232 interface.

8.1 Pulse Oximetry Measurement

The oximeter uses oximetry to measure functional oxygen
saturation in the blood. Pulse oximetry works by applying the
sensor to a pulsating arteriolar vascular bed, such as a finger or a
toe. The sensor contains a dual light source and a photonic
detector.
Bone, tissue, pigmentation, and venous vessels normally absorb a
constant amount of light over time. The arteriolar bed normally
pulsates and absorbs variable amounts of light during the
pulsations. The ratio of light absorbed is translated into a
measurement of functional oxygen saturation (SpO ). Because a
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