Automatic Calibration; Using The Finger Clip Sensor - Welch Allyn Spot Vital Signs 420 Series Operator's Manual

Factors that may degrade the performance of the pulse oximeter:
e Excessive ambient light e Excessive motion
e Electrosurgical interference ο Arterial catheters, blood pressure, and infusion lines, etc.
e Moisture in the sensor ο Improperly attached sensor
e Incorrect sensor for patient + Poor patient perfusion
e Venous pulsations e Anemia or low hemoglobin concentrations
e Cardiovascular dyes e Fingernail polish (if finger sensor is used)
e Sensor not at heart level
Automatic Calibration
Because light absorption by hemoglobin is wavelength dependent and because the mean
wavelength of LEDs varies, an oximeter must know the mean wavelength of the sensor's red
LED to accurately measure SpO2.
During measurement, the instrument's software selects coefficients that are appropriate for the
wavelength of that individual sensor's red LED; these coefficients are then used to determine
SpO».
Additionally, to compensate for differences in tissue thickness, the light intensity of the sensor's
LEDs is adjusted automatically.
OxiMax Technology
Spot Vital Signs is designed to use Nellcor OxiMax brand sensors which integrate the OxiMax
technology. These sensors are identified by their deep blue plug color. All OxiMax sensors
contain a memory chip carrying information about the sensor, which the oximeter needs for
correct operation, including the sensor's calibration data, model type, troubleshooting codes, and
error detection data. This unique oximetry architecture enables several new features with Spot
Vital Signs.
When an OxiMax sensor is connected to Spot Vital Signs, the pulse oximeter will first read the
information in the sensor memory chip, check it to make sure that there are no errors, and then
load the data to begin measurement.
Using the Finger Clip Sensor
Warning: Use only Nelicor brand SpO» sensors and accessories with Welch Allyn's Spot Vital
Signs.
The finger clip pulse oximeter sensor is designed for spot check measurements of pediatric and
adult patients.
Insert the patient's finger (preferably left or right index finger) completely into the sensor. The
thumb is specifically not recommended for use with the finger clip sensor.
Note: If blood pressure measurement is occurring simultaneously, ensure that the SpO> finger clip
sensor ts attached to the limb opposite the limb with the blood pressure cuff.
Note: Check sensor sites periodically to determine circulation, sensor positioning, and skin sensitivity.
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