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1. WO2010085895 - A METHOD FOR ESTIMATING LEAKS FROM VENTILATOR CIRCUITS

Publication Number WO/2010/085895
Publication Date 05.08.2010
International Application No. PCT/CA2010/000134
International Filing Date 29.01.2010
IPC
A61M 16/00 2006.01
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
16Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
CPC
A61M 16/0051
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY
16Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
0051with alarm devices
A61M 16/021
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY
16Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
021operated by electrical means
A61M 2016/0021
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY
16Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
0003Accessories therefor, e.g. sensors, vibrators, negative pressure
0015inhalation detectors
0018electrical
0021with a proportional output signal, e.g. from a thermistor
A61M 2016/0027
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY
16Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
0003Accessories therefor, e.g. sensors, vibrators, negative pressure
0027pressure meter
A61M 2016/0033
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY
16Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
0003Accessories therefor, e.g. sensors, vibrators, negative pressure
003with a flowmeter
0033electrical
A61M 2205/15
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY
2205General characteristics of the apparatus
15Detection of leaks
Applicants
  • YRT LIMITED [CA]/[CA] (AllExceptUS)
  • YOUNES, Magdy [CA]/[CA] (UsOnly)
Inventors
  • YOUNES, Magdy
Agents
  • STEWART, Michael, I.
Priority Data
61/202,12329.01.2009US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) A METHOD FOR ESTIMATING LEAKS FROM VENTILATOR CIRCUITS
(FR) PROCÉDÉ D'ÉVALUATION DE FUITES DE CIRCUITS VENTILATEURS
Abstract
(EN)
Gas leakage from a ventilator circuit and patient interface is estimated by a method that relies on breath-by-breath or time-to-time variability in the pattern of pressure delivery by the ventilator, comprising generating signals that correspond to pressure (PCIRCUIT) and flow rate (Flow) in the ventilator circuit, integrating flow (Integrated Flow), measuring the change in Integrated Flow (ΔV) over an INTERVAL extending from a selected point in the expiratory phase of a ventilator cycle to a selected point during the expiratory phase of a nearby ventilator cycle, repeating the measurement of ΔV for at least two said INTERVALS, processing PCIRCUIT to produce an index or indices that reflect(s) the pattern of pressure delivery by the ventilator during each of said INTERVALS, applying statistical methods to determine the relation between the differences in ΔV among INTERVALS and the corresponding differences in said index or indices of PCIRCUIT, and establishing from said relation the leak rate at specified PCIRCUIT values.
(FR)
Une fuite de gaz d'une interface patient et circuit ventilateur est évaluée par un procédé qui repose sur une variabilité respiration-par-respiration ou moment-à-moment du profil de distribution de pression par le ventilateur. Le procédé comprend les étapes consistant à générer des signaux qui correspondent à une pression (PCIRCUIT) et à un débit (Flow) dans le circuit ventilateur, à intégrer un écoulement (Ecoulement Intégré), à mesurer la modification de l'Ecoulement Intégré (ΔV) sur un INTERVALLE s'étendant d'un point sélectionné dans la phase d'expiration d'un cycle ventilateur à un point sélectionné pendant la phase d'expiration d'un cycle ventilateur voisin, à répéter la mesure de ΔV pendant au moins deux dits INTERVALLES, à traiter PCIRCUIT afin de produire un ou des indices qui reflètent le profil de distribution de pression par le ventilateur pendant chacun desdits INTERVALLES, à appliquer des procédés statistiques afin de déterminer la relation entre les différences de ΔV entre les INTERVALLES et les différences correspondantes dans ledit ou lesdits indices de PCIRCUIT, et à établir à partir de ladite relation le taux de fuite à des valeurs de PCIRCUIT spécifiées.
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