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Air compressor battery duration with mechanical ventilation in a field anesthesia machine
Dale F Szpisjak1, Anthony A Giberman2
1Department of Anesthesiology, Uniformed Services University, Room C-1090, 4301 Jones Bridge Road, Bethesda, MD 20814.
Military Medicine
|May 5, 2015
Summary
Battery backup for anesthesia ventilators was tested. Lower pulmonary compliance significantly reduced battery duration, impacting field anesthesia machine usability.
Area of Science:
- Anesthesiology
- Biomedical Engineering
- Critical Care Medicine
Background:
- Compressed air is essential for powering field anesthesia machine ventilators.
- Battery backup for air compressors is crucial for maintaining ventilation during power outages.
- Understanding battery duration is vital for ensuring patient safety in remote or emergency settings.
Purpose of the Study:
- To determine the battery duration of a compPAC ventilator's air compressor powered by a NiCd battery.
- To assess battery performance under varying pulmonary compliance (high and low) and tidal volumes.
- To evaluate the reliability of battery backup for field anesthesia ventilation.
Main Methods:
- The study used a Vent Aid Training Test Lung to model high (HC) and low (LC) pulmonary compliance.
- The compPAC ventilator's air compressor was powered by a NiCd battery, with target tidal volumes (VT) of 500, 750, and 1,000 mL.
- Battery duration was measured until VT fell below control limits (mean VT - 3SD), with N=5 per group.
Main Results:
- Battery duration varied from 185.8 (±3.2) minutes (LC-1000 group) to 233.3 (±3.6) minutes (HC-750 group).
- The low compliance, high tidal volume group (LC-1000) exhibited significantly shorter battery duration (p = 0.027).
- Differences in battery duration among other groups were not clinically significant.
Conclusions:
- Battery duration is significantly affected by pulmonary compliance, with lower compliance leading to shorter operational times.
- The compPAC ventilator's NiCd battery backup may have limitations in scenarios requiring ventilation for patients with low pulmonary compliance.
- Further research into battery technology and power management is needed for reliable field anesthesia ventilation.
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