Masimo Radical Signal Extraction Manuel de l'opérateur télécharger pdf (Page 8)

1-6 Rad-57 Signal Extraction CO-Pulse Oximeter Operator’s Manual

Rad-57 Signal Extraction CO-Pulse Oximeter Operator’s Manual 1-7

are abnormal (less than 90% for arterial oxygen saturation, and greater than 1% for

methemoglobin concentration). As blood gas samples are usually taken over a period

of 20 seconds (the time it takes to draw the blood) a meaningful comparison can only be

achieved if the core oxygen saturation and carboxyhemoglobin concentration of the patient

are stable and not changing over the period of time that the blood gas sample is taken.

MASIMO SET SIGNAL EXTRACTION TECHNOLOGY FOR SpO

MEASUREMENTS

Masimo Signal Extraction Technology’s signal processing differs from conventional

pulse oximeters. Conventional pulse oximeters assume that arterial blood is the only

blood moving (pulsating) in the measurement site. During patient motion, however, the

non-arterial blood also moves, causing conventional pulse oximeters to read low values,

because they cannot distinguish between the arterial and venous blood movement

(sometimes referred to as noise). Masimo SET pulse oximetry utilizes parallel engines and

adaptive digital filtering. Adaptive filters are powerful because they are able to adapt to the

varying physiologic signals and/or noise and separate them by looking at the whole signal

and breaking it down to its fundamental components. The Masimo SET signal processing

algorithm, Discrete Saturation Transform

(DST), reliably identifies the noise, isolates it

and, using adaptive filters, cancels it. It then reports the true arterial oxygen saturation for

display on the monitor.

SpCO MEASUREMENTS DURING PATIENT MOTION

Rad-57 displays measurements of SpCO during patient motion. However, because of the

changes in the physiological parameters such as blood volume, arterial-venous coupling,

etc. that occur during patient motion, the accuracy of such measurements is not reliable.

overview

Rad-57 Signal Extraction Pulse CO-Oximeter Operator’s Manual

overview

Digitized,

Filtered &

Normalized

R/IR

(Conventional

Pulse Oximetry)

Adaptive

Filter with

DST

Adaptive

Filter with

SST

FST

Proprietary

Algorithm 4

Saturation

Post

Processor

Confidence

Based

Arbitrator

MEAS

CONF

MEAS

CONF

MEAS

CONF

MEAS

CONF

MEAS

CONF

MASIMO SET PARALLEL ENGINES

MASIMO SET DST

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 29 30

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