User's Manual

SmartOne
Page 5 of 17
Rev.0.1
User manual
turbine flow sensor and oximetry sensor or other accessories may cause errors in measurement and/or compromise the
correct functioning of the device, and is therefore not permitted.
In the event of any incident or accident of any kind resulting from the use of the device, the user is required to inform the
manufacturer without delay, according with Directive 93/42/EEC on Medical Devices.
1.2.1 Danger of cross-contamination
Two different types of turbine sensors can be used with the device: one is single-patient disposable and one is reusable. A
mouthpiece is required in order to connect a subject to the spirometer.
In order to avoid exposing the subject to the hazard of cross-contamination, the reusable flow sensor must always be cleaned
before each spirometry test, and a new disposable mouthpiece must always be used for each subject. The use of an anti bacterial
filter is at the discretion of the doctor.
If a disposable turbine is used, then a new one must be used for each patient.
1.2.2 Turbine
The correct functioning of the re-usable turbine can only be guaranteed if it
has been cleaned in the correct manner and is free from foreign bodies which
could alter its movement. If the turbine has not been cleaned sufficiently this
could cause cross-contamination from one patient to another. Periodic
cleaning should only be done when the device is for personal use and will
only be used by one patient. The cleaning of the turbine should be
performed according to the instructions contained in the User’s Manual.
Do not expose the turbine to a direct jet of water or air, and avoid contact with high temperature liquids.
Do not allow dust or foreign bodies to enter the turbine sensor, in order to avoid incorrect functioning and possible damage. The
presence of any impurities (such as hair, sputum, threads etc.) within the body of the turbine sensor may seriously compromise the
accuracy of the measurements.
Notes about calibration of reusable turbine
WARNING
The turbine flow sensor does not require calibration but needs only a regular cleaning. If a calibration must be made then
the following guidelines should be carefully noted.
Calibration can be made using a siring a calibration syringe ad making a FVC test.
In line with the publication "Standardised Lung Function Testing" of the European Respiratory Society (Vol 6,
Supplement 16, March 1993), the air expired from the mouth is at a temperature of circa 33/34 °C.
The expired flow and volume, to be converted to BTPS conditions (37 °C) must be increased by 2.6% - this is derived
from the BTPS factor of 1.026 at a temperature of 33°C, which represents a correction of 2.6%. In practice the BTPS factor
for the expired flow and volumes is therefore constant and equal to 1.026.
For the inspired volumes and flows, the BTPS factor depends upon the ambient temperature as the air inspired is at
ambient temperature.
For instance at an ambient temperature of 20°C with relative humidity at 50%, the BTPS factor is 1.102, a correction of
+10.2%.
The correction of the inspired volumes and flows is made automatically as the machine has an internal temperature
sensor; the BTPS values are thus calculated.
If a 3L syringe is used to make the calibration and if the Smart One® is calibrated correctly then the FVC (syringe) value
will be:
3.00 (FVC) x 1.026 (BTPS) = 3.08 L (FVC at BTPS).
If the ambient temperature is 20°C, the FIVC (syringe) value will be:
3.00 (FIVC) x 1.102 (BTPS) = 3.31 L (FIVC at BTPS).
The user must be aware that the volume of the syringe shown by the machine is converted to BTPS conditions, so that
the "increase" of the results with respect to the expected values does not constitute an error.
For instance, if the calibration procedure is carried out with measured data:
FVC = 3.08 L and FIVC = 3.31 L at an ambient temperature of 20°C the resulting correction factor becomes:
EXPIRATION .00%
INSPIRATION .00%
This does not represent an error, but is a logical consequence of the explanation detailed above.