System and method for disconnection and occlusion detection...

A - Human Necessities – 61 – M

Patent

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A61M 16/00 (2006.01)

Patent

CA 2281835

The system (10) and method for detect-ing disconnection and occlusion of a tubing system (16) of a patient ventilator (12) detects disconnection of the tubing system (16), opens the exhalation valve, delivers an idle flow of breathing gas to the tubing system (16), dis-ables breath triggering, and generates an alarm. A reconnection of the tubing system (16) can also be detected, to initiate resumption of pres-sure supported inspiration. For occlusion de-tection, the pressure drop in the tubing system is determined by pressure sensors (26, 36) in the inspiratory and expiratory airways (20, 18) of the tubing system (16). The two pressure drop values are compared, and once occlusion is detected, an alarm is generated, and the ven-tilator (12) responds to protect the patient (14) from over distension. Abatement of the occlu-sion can also be monitored in a pressure based occlusion status cycling mode, and the ventila-tor (12) can revert back to normal ventilation when either circuit occlusion or exhaust port occlusion are not detected.

La présente invention, composée d'un système (10) et d'un procédé permettant de déceler le débranchement et l'occlusion de la tubulure (16) d'un respirateur (12) côté malade, décèle le débranchement de la tubulure (16), ouvre la valve d'exhalation, distribue un flux inerte de mélange respiratoire dans la tubulure (16), met hors service l'enclenchement respiratoire, et enclenche une alarme. La présente invention permet également de déceler un rebranchement de la tubulure (16) afin d'amorcer la reprise de l'assistance inspiration. Pour la détection des occlusions, des capteurs de pression (26,36) dans les branches inspiratoires et expiratoires (20,18) de la tubulure (16) déterminent les chutes de pression dans la tubulure (16). Le système compare les deux valeurs de chute de pression et dès que l'occlusion a été détectée, il enclenche une alarme et le respirateur (12) réagit en conséquence afin de protéger le patient (14) de la surdilatation pulmonaire. Le système permet également de surveiller la diminution de l'occlusion dans un mode de contrôle cyclique de l'état d'occlusion basé la pression, le respirateur (12) pouvant reprendre la ventilation normale lorsque le système ne détecte ni une occlusion de circuit ni une occlusion de l'orifice expiratoire.

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