A prototype small-bore ventilation catheter with a cuff: cuff inflation optimizes ventilation with the Ventrain

Area of Science:

• Respiratory physiology
• Medical device engineering
• Anesthesiology

Background:

• Traditional small-diameter ventilation tubes lack cuffs, hindering passive gas outflow.
• Ventrain technology facilitates expiration and ventilation via small-bore catheters, especially in obstructed airways.
• A novel small-bore ventilation catheter (SBVC) with a pressure monitoring lumen and cuff was developed.

Purpose of the Study:

• To evaluate the efficacy of oxygenation and ventilation using Ventrain with the developed SBVC.
• To compare performance in sealed and open airway models in a porcine study.

Main Methods:

• Six pigs underwent ventilation with Ventrain through the SBVC, with cuff inflated and deflated.
• Ventilation parameters: 15 L/min O2, 30 breaths/min, 1:1 I:E ratio.
• Conventional ventilation was used to achieve steady state before each test.

Main Results:

• Cuff inflation led to immediate and sustained elevated PaO2 (61 kPa) and stable PaCO2 (4.9 kPa).
• Cuff deflation resulted in significantly lower PaO2 (9 kPa) and premature ventilation cessation in 5 pigs due to high PaCO2 (>10.6 kPa).
• Pulmonary artery pressures increased with cuff deflation; intratracheal pressures were maintained between 5-20 cmH2O with cuff inflation.

Conclusions:

• The SBVC successfully integrates small airway benefits with cuff functionality.
• Cuff inflation is crucial for optimizing oxygenation and ventilation efficacy with Ventrain and the SBVC.