Nowadays at market present quite a lot of different spirometry technologies. Our Research and Development Department prepared a comprehensive comparison, which we are sharing here.
Principles |
Medikro Disposable Pneumotach |
Heatable
|
Turbine |
Disposable Turbine |
Ultrasound |
| Measurement of: | The pressure generated by the pneumotach |
The pressure generated by the pneumotach |
The rotation of the turbine |
The rotation of the turbine |
The transit time difference |
Patient Hygiene |
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|
No Extra Cross Contamination Protection needed |
Yes | No | No | Yes | Yes |
| No Need of Bacterial Filters | Yes | No | No | Yes | Yes |
Accuracy |
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| Low Flow Accuracy not limited by the measurement principle | Yes | Yes | note 2 | note 2 | note 4 |
| Zero Flow Stable because of the measurement principle | note 1 | note 1 | Yes | Yes | note 5 |
| Fast response to the direction change of the flow | Yes | Yes | note 3 | note 3 | Yes |
| Meets ATS/ ERS Standards | Yes | Yes | Yes | Yes | Yes |
Portability |
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| Low Power | Yes | No | Yes | Yes | Yes |
| Small size and weight | Yes | No | Yes | Yes | Yes |
Ambient Factors |
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| Ambient Factors affect to the Signal | Yes | Yes | Yes | Yes | Yes |
| Fast response to the change of the flow temperature and humidity |
Yes | No | Yes | Yes | note 6 |
Calibration |
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| Needs calibration | Yes | Yes | Yes | Yes | Yes |
| Can be calibrated | Yes | Yes | note 7 | note 7 | note 7 |
Long Period Use |
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| No Moving Parts | Yes | Yes | No | No | Yes |
Price |
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| Low Cost Replaceable Patient Part | Yes | No | No | Yes | Yes |
| Low Cost Measurement Device | Yes | No | Yes | Yes | Yes |
Disposable Pneumotach/ Heatable Pneumotach
Note 1 : pressure sensor can generate noise and zero level drift. Medikro has reduced this noise by 90% with new VCT Technology.
Turbine/ Disposable Turbine
Note 2 : mechanical friction affects to the start-up of the turbine.
Note 3 : mechanical inertia affects to the signal.
Note 7: depending on the Manufacturer
Ultrasound
Note 4 : linearization curve changes at the zone where the flow changes from laminar to turbulence.
Note 5 : the measurement principle generates noise to the measurement signal
Note 6 : the measurement principle is sensitive to the measured gas humidity and temperature.
Note 7: depending on the Manufacturer
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