Dynamic particle size control for aerosolized drug delivery

A - Human Necessities – 61 – M

Patent

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Details

A61M 15/00 (2006.01) A61J 7/04 (2006.01) A61M 11/04 (2006.01) A61M 16/00 (2006.01) A61M 16/10 (2006.01)

Patent

CA 2201129

This invention concerns devices, packaging and methodology for creating aerosols. Devices are hand held, self-contained units (40) which are automatically actuated at the same release point in a patient's inspiratory flow cycle. The release point is calculated by a microprocessor (26) which receives data from a flow sensor (31). The device is loaded with a cassette (46) of individual collapsible containers (1) of a pharmaceutically active drug. Actuation of the device forces the drug through a porous membrane (3) of the container (1) having pores in the range of about 0.25 microns to 6.0 microns. The membrane is flexible such that when the drug formulation is forced against and through the membrane, the membrane protrudes outward beyond the flow boundary layer of a flow path (29).

Dispositifs, emballages et techniques de création d'aérosols. Le dispositifs se composent d'unités compactes (40) que l'on tient dans la main et qui sont actionnées automatiquement au même point d'actionnement au cours d'un cycle inspiratoire chez un patient. Le point d'actionnement est calculé par un microprocesseur (26) qui reçoit les données d'un capteur d'écoulement (31). Le dispositif est chargé avec une cassette (46) composée de récipients individuels déformables (1) remplis d'un médicament pharmaceutiquement actif. L'actionnement du dispositif provoque le passage forcé du médicament à travers une membrane poreuse (3) du récipient (1), présentant des pores dont le diamètre varie entre 0,25 microns et 6,0 microns. Cette membrane est flexible, de sorte que lorsqu'elle est soumise à la pression du médicament qui la traverse, elle fait saillie vers l'avant au-delà de la couche limite d'écoulement d'une voie d'écoulement (29).

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