[abstract] MODIFICATIONS TO THE OMNI-VENT VENTILATOR FOR USE WITHIN THE MONOPLACE HYPERBARIC CHAMBER

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[abstract] MODIFICATIONS TO THE OMNI-VENT VENTILATOR FOR USE WITHIN THE MONOPLACE HYPERBARIC CHAMBER

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Title: [abstract] MODIFICATIONS TO THE OMNI-VENT VENTILATOR FOR USE WITHIN THE MONOPLACE HYPERBARIC CHAMBER
Author: Layton, W; Weaver, LK; Haberstock, D
Abstract: BACKGROUND: Some critically ill mechanically ventilated patients treated with hyperbaric oxygen therapy in the monoplace chamber require ventilator performance which exceeds that of the 500A monoplace ventilator (Sechrist Industries, Anaheim, CA)1. The only alternate FDA-approved ventilator for monoplace hyperbaric use is the Omni-Vent (Omni-Tech, Topeka, KS). Observation during in hospital transport of critically ill patients with stiff lungs suggested the Omni-Vent could deliver higher minute volumes with increased positive end-expiratory pressures (PEEP) then could be achieved with the 500A. METHODS: For increased patient safety, and to optimize ventilator performance, the Omni-Vent should be operated inside the hyperbaric chamber. Hydraulic, pneumatic, electrical and mechanical methods of ventilator control were considered. For safety and simplicity we chose mechanical control methods. Mechanical likages for inspiratory time (I time), expiratory time (E time), and flow were passed though a chamber hatch pass-through prot using underwater camera housing penetrators (Ikelite Underwater Systems, Indianapolis, IN). The Omni-Vent was disassembled, modified and oxygen cleaned for use inside the Sechrist 2500B hyperbaric chamber. RESULTS: the operator (outside the chamber), is able to adjust the Omni-Vent controls (inside the chamber), altering I time, E time and flow. The control knobs are sensitive requiring careful adjustment. Using a test lung (Manly Lung Ventilator Performance Analyzer, Medical Develpements Ltd., Chesham, Bucks, England) with airway resistance equal to zero, PEEP equal to 20 cm H2O, lung compliance equal to maximum stiffness (10 mL/cm H2O), the Omni-Vent was capable of delivering a ventilation rate up to 30 breaths per minute, tidal volume of 500mL, and a minute ventilation of 15 L/minute with the chamber compressed to 3.0 ATA. CONCLUSION: The Omni-Vent ha capabilities that substantially exceed those of the Sechrist 500A for providing increased minute volumes with high PEEP at chamber pressures up to 3.0 ATA in a test lung set to have profoundly low lung compliance. 1 (Weaver, L.K., Greenway, L.M., Elliott, C.G. Performance of the Sechrist 500A Hyperbaric Ventilator in a Monoplace hyperbaric Chamber. In: Hyperbaric Medicine Practice 1994, 235-245).
Description: Undersea and Hyperbaric Medical Society, Inc. (http://www.uhms.org )
URI: http://archive.rubicon-foundation.org/749
Date: 1998

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  • UHMS Meeting Abstracts
    This is a collection of the published abstracts from the Undersea and Hyperbaric Medical Society (UHMS) annual meetings.

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