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Performance and application of the Quantiflex air/oxygen mixer
British Journal of Anaesthesia
|November 1, 1976
Summary
The Quantiflex air/oxygen mixer offers accurate and rapid delivery of medical gas mixtures. Nurses found it more acceptable, easier, and faster than traditional methods for calculating air and oxygen flow rates.
Area of Science:
- Medical Devices
- Respiratory Therapy
- Clinical Engineering
Background:
- Accurate air and oxygen mixture delivery is crucial in respiratory care.
- Traditional methods for setting gas concentrations can be complex and time-consuming.
- Existing methods involve separate flowmeters and calculations (arithmetic, graph, slide-rule).
Purpose of the Study:
- To evaluate the performance and usability of the Quantiflex air/oxygen mixer.
- To compare the Quantiflex mixer against conventional methods used by nurses.
Main Methods:
- The Quantiflex mixer allows separate control of total flow rate and oxygen concentration (21-100%).
- It features a monitoring flowmeter for the mixture and oxygen component.
- Accuracy was tested at various flow rates (1.5-12 L/min) and pressures (208-415 kPa).
Main Results:
- Delivered oxygen concentrations were within +/- 2% of indicated values at 4-12 L/min.
- At lower flow rates (1.5-2 L/min), discrepancies ranged from -4% to +8%.
- Nurses rated the Quantiflex prototype superior in acceptability, ease of use, accuracy, and speed.
Conclusions:
- The Quantiflex air/oxygen mixer provides accurate gas mixture delivery.
- It significantly improves upon traditional methods in terms of clinical usability.
- The device is recommended for its efficiency and accuracy in healthcare settings.