Piston-based ventilator design and operation

A - Human Necessities – 61 – M

Patent

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A61M 16/00 (2006.01)

Patent

CA 2168136

Improvements in piston-based ventilator design and operation are described. An individual compensation of force dissipation within the gas delivery system is effected, so that the desired gas pressure is delivered to the patient airway without the necessity for monitoring the actual pressure and using it as feedback. A piston is dimensioned slightly less than the chamber wall of the pump to define a gap through which an acceptable amount of gas may leak but which eliminates the need for a physical seal, thereby minimizing the frictional resistance within the pump.

Des perfectionnements à la conception et au fonctionnement d'un respirateur du type à piston sont décrits. La perte d'énergie à l'intérieur du système de ventilation est individuellement compensée, de manière que les voies respiratoires du patient soient soumises à la pression de gaz souhaitée sans qu'il soit nécessaire de surveiller la pression réelle et d'utiliser cette valeur dans une boucle de rétroaction. Un piston est dimensionné de façon à être légèrement plus petit que le volume délimité par le corps de pompe et à laisser un espace vide par lequel peut fuir une quantité acceptable de gaz mais qui élimine la nécessité d'une garniture d'étanchéité, minimisant ainsi le frottement à l'intérieur de la pompe.

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