Welch Allyn 420 Series Operator's Manual page 64

Adult and Pediatric Finger Flexi-Form Sensor - This single-patient use sensor is for measuring
adult and pediatric patients where moderate patient movement is expected, or cross contamina-
tion is possible.
The preferred application site is the index finger. However, you may use other fingers or toes
where the tissue thickness is between 5 and 21 millimeters. Other sites may not give accept-
able results because of inadequate perfusion or inadequate light transmission. The application of
these sensors is the same for either adult or pediatric patients; the difference is in the size of the
sensor. For best results, secure the cable independently from the sensor. Make sure the tape
securing the cable does not restrict blood flow.
Caution: Do not stretch the tape while applying the sensor. This may cause inaccurate
readings or skin blisters.
Note: These sensors may be sterilized using ethylene oxide (EtO), cold cycle after removal from the
plastic shipping bag.
1. Grip the tab on the sensor's bottom adhesive cover and peel the adhesive cover off.
2. Place the patient's finger or toe into the sensor, nail side up, with the tip of the finger or toe
centered against the center line mark in the curved area. Reference the line that indicates the
center of the curved area on the tape. This will assure vertical alignment between the emitter
and detector. Wrap the tape around the finger. Do not cover the fingernail with tape during
this step.
3. Grip the top adhesive cover and peel it off.
4. Fold the sensor's top over the top of the finger. Ensure that the detector and emitter are
vertically aligned by the dotted axis line.
Infant Flexi-Form Sensor - The preferred application site is the large toe of infants greater than
2 kilograms in weight. Other sites may not give acceptable results because of inadequate perfu-
sion or inadequate light transmission.
Note: For best results, secure cable independently from the sensor, preferably around patient's ankle or
lower leg. Make sure the tape securing the cable does not restrict blood flow.
Caution: Check sensor sites periodically to determine circulation, sensor positioning, and skin
sensitivity.
Caution: Do not stretch the tape while applying the sensor. This may cause inaccurate
readings or skin blisters.
Note: These sensors may be sterilized using ethylene oxide (EtO), cold cycle after removal from the
plastic shipping bag.
1. Grip the sensor's adhesive cover and peel the adhesive cover off.
2. Place the sensor on the large toe with the center line mark centered on the side of the large
toe, taking care to have the detector centered on the bottom of the toe, and the emitter
centered on the toenail.
3. Wrap the tape around the toe, taking care to ensure that the detector and emitter are
vertically aligned by the dotted axis line.
58 Welch Allyn