BCI 1884SS Instructions d'exploitation télécharger pdf (Page 9)

Chapter 1: Introduction

Pulse Oximeter for Sleep Screening Operation Manual 1-1

Chapter 1: Introduction

About the Manual

The Operation Manual provides installation, operation, and maintenance instructions for

health-care professionals and other users, trained in monitoring respiratory and cardiovascular

activity.

Theory of Operation

The oximeter determines SpO

and pulse rate by passing two wavelengths of low intensity

light, one red and one infrared, through body tissue to a photodetector. During measurement,

the signal strength resulting from each light source depends on the color and thickness of the

body tissue, the sensor placement, the intensity of the light sources, and the absorption of the

arterial and venous blood (including the time varying effects of the pulse) in the body tissues.

Figure 1.0: Theory of Operation

1. Red and infrared LED light sources

2. Detector

The oximeter processes these signals, separating the time invariant parameters (tissue

thickness, skin color, light intensity, and venous blood) from the time variant parameters

(arterial volume and SpO

) to identify the pulse rate and calculate oxygen saturation. Oxygen

saturation calculations can be performed because oxygen saturated blood predictably absorbs

less red light than oxygen depleted blood.

Since measurement of SpO

depends on a pulsating vascular bed, any condition that restricts

blood flow, such as use of a blood pressure cuff or extremes in systemic vascular resistance,

may cause an inability to determine accurate pulse and SpO

readings.

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BCI 1884SS Instructions d'exploitation Page 9