Monitoring and control for a laryngeal mask airway device

Details Monitoring and control for a laryngeal mask airway device Monitoring and control for a laryngeal mask airway device

A - Human Necessities

61

M

A61M 16/04 (2006.01) A61M 25/10 (2006.01)

Patent

CA 2316301

A reversibly operable motor is mechanically connected to automatically position the piston (27) of an air syringe (26) that is pneumatically connected to the inflatable/deflatable seal ring or cuff (19) of a laryngeal mask airway device (LMA) (12) that is installed in a patient, who is being ventilated and/or anaesthetized via the airway of the LMA device (12). Ideally, (i) the air at the head end of the syringe (26), plus (ii) the air contained in the inflatable cuff (19) of the LMA (12), plus (iii) the air contained in their interconnection, is a "substantially constant" volume which is shared at these three locations but which is automatically shifted by piston (27) displacement, such that air pressure in the substantially constant volume is caused to correct as necessary for conformance to a predetermined level of set-point pressure. Various instrumentalities (10), including microprocessor- controlled instrumentalities, continuously monitor patterns of system response to observed pattern abnormality, with audibly and visually reported warnings to the anaesthetist.

L'invention porte sur un moteur réversible actionnant mécaniquement le piston (27) d'une seringue à air (26) pneumatiquement reliée au ballonnet (19) d'étanchéité gonflable/dégonflable d'un masque (12) endotrachéal (LMA) appliqué à un patient en cours de ventilation et/ou d'anesthésie. Idéalement: (i) l'air de l'extrémité de la seringue (26), plus (ii) l'air contenu dans le ballonnet (19) du LMA (12), plus (iii) l'air contenu dans leurs interconnections, constitue un volume sensiblement constant commun aux trois parties, mais automatiquement commuté par les déplacements du piston (27) afin que la pression de l'air dans ledit volume s'ajuste si nécessaire sur un niveau prédéterminé de valeur de consigne. L'invention porte également sur différents instruments (10), dont certains commandés par microprocesseur, suivant en continu les formes de réponse du système aux anomalies constatées, et transmettant à l'anesthésiste des alarmes sonores et visuelles.

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