Surgery – Respiratory method or device – Means for mixing treating agent with respiratory gas
Patent
1998-05-08
2000-11-07
Weiss, John G.
Surgery
Respiratory method or device
Means for mixing treating agent with respiratory gas
12820323, A61M 1500, A61M 1600, B05D 714, B05D 8306
Patent
active
061421456
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a powder inhaler for administering powder by inhalation.
A number of powder inhalers are known which use different systems for introducing a dose of powder into an air stream. Typically, the powder is inhaled into the lungs of a patient in order to treat, for example, asthma.
EP-A-0237507 discloses one such powder inhaler. This inhaler comprises an inhalation channel and a mouthpiece which includes an air chamber and an outlet nozzle, through which a stream of air is drawn during inhalation by a user, and a dosing mechanism for providing a dose of powder to the inhalation channel. During inhalation, air is first drawn into and through the inhalation channel so as to pick up powder. The stream of air containing powder is then drawn through the air chamber and out of the outlet nozzle of the mouthpiece.
FIG. 1 illustrates such a powder inhaler. The inhaler comprises a mouthpiece 2 which includes an outlet nozzle 4, an inhaler body 6 and a rotatable grip portion 8 for operating a dosing mechanism for providing doses of powder for inhalation. The inhaler body 6 is provided with an opening 10 which is filled with a window 12 through which an indicating wheel 42 is visible so as to provide an indication as to the usage of the inhaler.
FIG. 2 illustrates in exploded view component parts disposed within and to the inhaler body 6. The inhaler body 6 is capped with a divider 14 which is fixed thereto. For aesthetic reasons the inhaler body 6 is an opaque moulding. The divider 14 is a transparent moulding which has a depending tongue 15, a part of which forms the window 12.
Within the inhaler body 6 are housed the component parts of the dosing mechanism. These component parts include a dosing unit 16 which comprises a member 17 having a planar surface in which a plurality of dosing elements 18 are provided and a shaft 20 which extends axially from the centre of the member 17, an inhalation unit 22 which comprises an inhalation channel 24 and a storage unit 26 which comprises a storage chamber 28 for storing powder. The above-mentioned component parts of the dosing mechanism are assembled by passing the inhalation channel 24 through an opening 30 in the storage unit 26 and passing the shaft 20 through central openings 32, 34 in the inhalation unit 22 and the storage unit 26 respectively. When so assembled, the upper ends of the inhalation channel 24 and the storage chamber 28 pass respectively through first and second openings 36, 38 in the divider 14. In this way, the inhalation unit 22 and the storage unit 26 are fixed in position in relation to one another and the dosing unit 16 can be rotated relative thereto.
In this inhaler the storage unit 28 is open at the bottom such that in use powder is provided to the dosing unit 16 under the action of gravity and the inhalation unit 22 further comprises scrapers 40 which are resiliently biased against the surface of the member 17 in which the dosing elements 18 are provided. In this way, as the dosing unit 16 is rotated, the dosing elements 18 are filled with powder by the scrapers 40. Powder is prevented from passing through the dosing elements 18 by a plate (not illustrated) which is disposed beneath the dosing unit 16.
As illustrated in FIG. 2, the divider 14 further comprises a supporting member 41 for rotatably supporting an indicating wheel 42. The indicating wheel 42 includes a plurality of teeth 44 disposed around the periphery thereof which engage with a spiral groove or protrusion 46 on the end face of the shaft 20. The supporting member 41 is configured to align the indicating wheel 42 such that a part of the periphery thereof is disposed adjacent the inner surface of the window 12. In use, as the dosing unit 16 is rotated, the spiral groove or protrusion 46 engages with one or more of the teeth 44 on the indicating wheel 42 so as to rotate the same. In this way, by providing a coloured marking on the periphery of the indicating wheel 42, it is possible to provide the user with a visible indication at the window 12 as to the usa
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International Search Report, PCT/SE 98/00460, Jul. 30, 1998.
Dagsland Allan
Malmqvist-Granlund Karin
Virtanen Risto
Astra Aktiebolag
Weiss John G.
Weiss Joseph F.
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