Louis M Walker

US Patent:

62409182, Jun 5, 2001

Filed:

Feb 20, 1997

Appl. No.:

8/803363

Inventors:

Thomas J. Ambrosio - Somerville NJ
Warren A. Benson - Woodville WI
Kim C. Dao - Wayne NJ
David J. Kenyon - Morristown NJ
Walter J. Kreiseder - Barrington IL
Theodore J. Schonebaum - Menomonie WI
Allen J. Vogel - Long Grove IL
Louis B. Walker - Menomonie WI
Tsong-Toh Yang - Warren NJ

Assignee:

Schering Corporation - Kenilworth NJ

International Classification:

A61M 1500
A61M 1600
B05D 714
B65D 8306

US Classification:

12820315

Abstract:

A powder dispenser includes a reservoir body including a supply of powder and an inhalation conduit; a driving body for rotating the reservoir body and including upper recesses and two spring fingers in lower driving recesses thereof; a rotatable metering plate for carrying a metered amount of powder from the supply to the inhalation conduit, and having an underside with ribs; a gas permeable retainer welded to the ribs; a spring biasing the metering plate toward the reservoir body; a nozzle having spiked ribs welded in the upper recesses of the driving body and including a chimney with vertical flutes; an adapter non-rotatably mounted with respect to the metering plate and including two locking recesses for receiving the spring fingers for locking engagement and two helical cam tracks with a square cross-section; a closure cap covering the driving body and including priming ribs biasing the spring fingers out of the locking recesses and engaging with the locking recesses to rotate the driving body, and two cams riding within the cam tracks; a base non-rotatably connected with the metering plate; and a counter rotatably mounted on the base and including rotatable counter rings providing a visual count of the number of doses of powder to be dispensed, and a pawl assembly engaging with gear teeth of the counter rings for rotating the same, the pawl assembly including an outer wall, a pawl and a pawl spring integrally molded as a single piece.