An automatic sigh feature for animal ventilators.

Area of Science:

• Veterinary Medicine
• Physiology
• Biomedical Engineering

Background:

• Mechanical ventilation in laboratory animals is crucial for research.
• Ensuring adequate lung inflation and preventing atelectasis is a common challenge.
• Automatic delivery of deep breaths (sighs) can improve ventilation efficacy.

Purpose of the Study:

• To describe a novel, low-cost device for automatically delivering deep breaths to ventilated animals.
• To provide a reliable method for enhancing lung volume maintenance during mechanical ventilation.
• To detail the mechanism and control of the deep breath delivery system.

Main Methods:

• A device was developed utilizing a solenoid valve in the expiratory tubing of a standard laboratory ventilator.
• The device enables the animal to inspire 2-4 consecutive tidal volumes without expiration to simulate a deep breath.
• Integrated circuits control the interval between deep breaths, selectable from 1 to 10 minutes.

Main Results:

• The described device reliably provides automatic deep breaths to ventilated animals.
• The system allows for adjustable deep breath frequency (intervals of 1, 2, 4, 6, 8, or 10 minutes).
• The total parts cost for constructing the device is approximately $90.

Conclusions:

• This device offers a practical and affordable solution for implementing deep breaths in animal mechanical ventilation.
• The automatic nature and adjustable intervals enhance the utility of the system for various research protocols.
• The low cost makes this technology accessible for widespread use in laboratory settings.