Exhalation valve for a patient ventilator

A - Human Necessities – 61 – M

Patent

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Details

A61M 16/20 (2006.01) F16K 31/08 (2006.01) H01F 7/06 (2006.01)

Patent

CA 2284082

The exhalation valve (10) includes a valve housing (12) with a valve seat (20) having an annular shoulder (22), and a valve poppet (26) having a face (25) with a corresponding annular groove (24). A soft flexible diaphragm seal (28) disposed between the face (25) of the valve poppet (26) and the valve seat (20) provides a suspended soft seal (28), ensuring perpendicularity in the valve seal (28) for improved accuracy of valve (10) operation. An annular permanent magnet (60) and an annular magnetic ring (62) are disposed around and spaced apart from a magnetic body (36) to define an air gap (64) in which an electromagnetic coil (66) is disposed. The electromagnetic coil (66) is connected to a control mechanism (74) by a flexible circuit connector (73) that is sufficiently slack that provides minimal force transverse to the longitudinal axis of the valve (10). An assembly is provided for adjusting uniformity of the air gap (64) and of concentricity of magnetic body (36) and shaft (32) of the poppet (26), and the control mechanism (74) adjusts the current supplied to the electromagnetic coil (66), compensating for changes in the magnetic field strength of the valve (10) due to changes in temperature, velocity of the valve poppet (26), and patient airway pressure. A flexible diaphragm (44) is also connected between the valve poppet (26) and magnetic body (36) to prevent cross-contamination between the exhalation valve (10) and breathing gas.

Valve expiratoire (10) comportant un logement (12) muni d'un siège (20) présentant un épaulement (22) annulaire et un champignon (26) dont une face (25) comporte un sillon annulaire (24) correspondant à l'épaulement. Un diaphragme d'obturation (28) souple et flexible, disposé entre la face (25) du champignon (26) et le siège (20) de valve, forme une obturation (28) souple suspendue. Ce diaphragme permet d'assurer une obturation (28) perpendiculaire et donc un fonctionnement plus précis de la valve (10). Un aimant (60) permanent annulaire et un anneau (62) magnétique annulaire sont disposés autour d'un corps magnétique (36) et espacés de ce dernier de manière à former un entrefer (64) dans lequel est disposée une bobine électromagnétique (66). La bobine électromagnétique (66) est reliée à un mécanisme de commande (74) par un connecteur (73) à circuits flexibles qui est suffisamment lâche pour que la force transversale appliquée sur l'axe longitudinal de la valve (10) soit minimale. Un dispositif permet de régler l'uniformité de l'entrefer (64) et le centrage du corps magnétique (36) et de la tige (32) du champignon (26). En outre le mécanisme de commande (74) règle l'alimentation de la bobine électromagnétique (66) en courant, en compensant les modifications d'intensité du champ magnétique de la valve (10) dues aux changements de température, de vitesse du champignon (26) et de pression des voies respiratoires du patient. Un diaphragme (44) flexible relie en outre le champignon (26) et le corps magnétique (36) pour empêcher une intercontamination de la valve expiratoire (10) avec le gaz respiratoire.

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