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US 5,727,546 AGranted
Powder inhaler with breath flow regulation valve
AssigneeFisons Limited
InventorsAlastair Robert Clarke, Clive Sleath, Michael Trevor Shepherd
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AssigneeFisons Limited
InventorsAlastair Robert Clarke, Clive Sleath, Michael Trevor Shepherd
Estimating the term…
There is provided a device for the administration of an inhalation medicament, including a body defining a through-going air pathway having a longitudinal axis, an air inlet, an air outlet forming a mouthpiece, means for dispensing medicament into the pathway and air flow regulating means, characterised in that the air flow regulating means includes a movable obstructing means adapted to reduce the cross-sectional area of the pathway at a location between the air inlet and the means for dispensing medicament, and biassing means, whereby the obstructing means is biassed into a first resting position in which the cross-sectional area of the pathway is minimum and is adapted to move against the bias of the biassing means to a second position in which the cross-section area of the pathway is maximum in response to a pressure fall at the moiuthpiece caused by inhalation and is adapted to move further to a third position in which the cross-sectional area of the pathway is less than maximum in response to a greater pressure fall at the mouthpiece caused by inhalation.
A device for the administration of an inhalation medicament, including a body defining a through-going air pathway having a longitudinal axis, an air inlet, an air outlet forming a mouthpiece, means for dispensing medicament into the pathway and air flow regulating means which includes a movable obstructing means adapted to reduce the cross-sectional area of the pathway at a location between the air inlet and the means for dispensing medicament, and biassing means, the obstructing means being biassed into a first resting position in which the cross-sectional area of the pathway is maximum and being adapted to move against the bias of the biassing means to a second position in which the cross-sectional area of the pathway is less than maximum in response to a pressure fall at the mouthpiece caused by inhalation, wherein the air flow regulating means further includes second movable obstructing means adapted to reduce the cross-sectional area of the pathway at a location between the air inlet and the means for dispensing medicament, and second biassing means, the second obstructing means being biassed into a first resting position in which the cross-sectional area of the pathway is minimum and being adapted to move against the bias of the biassing means to a second position in which the cross-sectional area of the pathway is more than minimum in response to a pressure fall at the mouthpiece caused by inhalation.
A device for the administration of an inhalation medicament, including a body defining a through-going air pathway having a longitudinal axis, an air inlet, an air outlet forming a mouthpiece, means for dispensing medicament into the pathway and air flow regulating means, wherein the air flow regulating means includes a moveable obstructing means adapted to reduce the cross-sectional area of the pathway at a location between the air inlet and the means for dispensing medicament, and biassing means, the obstructing means being biassed into a first resting position in which the cross-sectional area of the pathway is minimum and being adapted to move against the bias of the biassing means to a second position in which the cross-sectional area of the pathway is maximum in response to a pressure fall at the mouthpiece caused by inhalation and being adapted to move further to a third position in which the cross-sectional area of the pathway is less than maximum in response to a greater pressure fall at the mouthpiece caused by inhalation.
A device according to claim therefor 15 in which the obstructing means is of substantially circular section along an axis perpendicular to the longitudinal axis of the pathway.
A device according to claim therefor 15 in which the cross-sectional area of the pathway when the obstructing means is in the first position, is substantially zero.
Dependencies are inferred from the claim text.