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The innovative tremoflo C-100 Airwave Oscillometry System (AOS) offers fast, easy assessment of large and small airway function. Measurements are obtained during tidal breathing and without patient effort. The tremoflo is excellently suited for a wide range of patients, from preschoolers to the elderly.


1. Fast & Easy

To assess respiratory function, the tremoflo adds a gentle oscillatory wave to the patient’s regular, quiet breathing. A measurement duration of only 20 seconds allows three repetitions within a couple of minutes.

2. Outcomes

The tremoflo provides curves of Resistance (R) and Reactance (X) as well as parameters reflecting large and small airway function.

3. Central Obstruction

An obstruction of the large, central airways causes a parallel upward shift in R while X remains largely unchanged.

4. Peripheral Obstruction

Obstruction of the small airways in the peripheral lung causes a downward shift in X along with an increase in R. In presence of heterogeneities, R also becomes curved.

Expert Opinions

Oscillometry offers “an in-office tool that can assess peripheral airway impairment even in young children and may detect airway obstruction earlier than spirometry.”

“Monitoring small airway function by [Oscillometry] can be useful in identifying patients who are at risk for losing asthma control, and in assisting with clinical decisions and treatment plans.” Bickel et al., Chest 2014

“In studies that use both [oscillometry] and spirometry, [oscillometry] is more useful than spirometry in children in differentiating asthma from healthy cohorts” Galant et al., AAAAI 2017 Oscillometry “has been found to be useful in measuring response to bronchodilators, such as salbutamol and ipratropium, in patients with asthma and COPD.”

Oscillometry “has been found to be useful in measuring response to bronchodilators, such as salbutamol and ipratropium, in patients with asthma and COPD.”

Download Brochure here:

For more visit: www.thorasys.com

Piston Medicals

Oscillometer: PDD-301/os

The Forced Oscillation Technique (FOT) offers a modern and reliable but economical method for the impedance measurement of respiratory system.
During test the patient is only asked to breath normally and no respiratory manoeuvre is needed.
Since the test requires minimum co-operation from the patients, the FOT device is and uniquely applicable in paediatric pulmonology

  • Measurement of the components of the airway impedance at different frequencies
  • Determination of the resonance frequency of the airways
  • Average calculation of Reproducible Impedance Spectra
  • Model evaluation of Impedance Spectra
  • Calculation of Resistance / Elastance / Inertance of the respiratory system
  • Random induced frequencies
  • Sequential induced frequencies

Measurement Modes

  • Respiratory impedance measurement
  • FVC measurement
  • IVC measurement
  • MVV measurement

Measured Parameters

Forced Oscillation Technique
RrsResistive component of respiratory impedance
IrsInertance of the airways
CrsCompliance of the respiratory system
fresResonance frequency
Forced ex and inspiration
FVCForced Vital Capacity
FEV*0.5Forced Expiratory Volume in 0.5 second
FEV*1.0Forced Expiratory Volume in 1.0 second
FEV*0.5/IVCRation of FEV*0.5 and IVC in %
FEV*0.5/FVCRation of FEV*0.5 and FVC in %
FEV*1.0/IVCRation of FEV*1.0 and IVC in %
FEV*1.0/FVCRation of FEV*1.0 and FVC in %
PEFPeak Expiratory Flow
FEF*25-75%Forced mid-Expiratory Flow rate
FEF*75%Forced Expiratory Flow at 75% lung volume
FEF*50%Forced Expiratory Flow at 50% lung volume
FEF*25%Forced Expiratory Flow at 25% lung volume
FETForced Expiratory Time
MTTMean Transit Time
FIVCForced Inspiratory Vital Capacity
FIV*0.5Forced Inspiratory Volume in 0.5 sec
FIV*1.0Forced Inspiratory Volume in 1.0 sec
PIFPeak Inspiratory Flow rate
FIF*25-75%Forced mid-Inspiratory Flow rate
Static vital capacity
IVCInspiratory Vital Capacity
IRVInspiratory Reserve Volume
ERVExpiratory Reserve Volume
TVTidal Volume
SVCSlow Vital Capacity
Maximal Voluntary Ventilation
MVVMaximal Voluntary Ventilation
MVV*fMaximal Voluntary Ventilation Frequency


PinkFlow flow meterPPF-18

Bacterial and viral filterPBF-100

Mouth pieceMPA-30

Mouth piecePMP-28

Nasal clipPNC-65

Calibration syringePCS-3000

Calibration syringePCS-3000

Technical Data

Flow meterLilly type pneumotachometer with screen
Flow range±15 l/s
Accuracy±2% or 50 ml, whichever is greater
Dead space36 ml
Resistance60 Pa/l/s @ 15 l/s
Induced frequency range4 Hz – 48 Hz
Induced pressure wavemax. 0,2 kPa
Induced powermax. 50W
Size without patient circuitHeight: 300 mm
Wide: 300 mm
Deep: 150 mm
Weight7,2 kg
Power supply90 ÷ 260 VAC 50/60 Hz
Power consumption75 VA

Download Brochure here:

For more visit: www.pistonmedical.com