| 摘要 |
A powder inhaler for administering powder by inhalation, comprising: a housing having a screw thread and a substantially circular sealing surface coaxial therewith, the sealing surface of the housing being separate from the screw thread of the housing; a mouthpiece attached to the housing; and a cap for covering at least the mouth piece, the cap having a screw thread for engaging the sealing surface of the housing, said sealing surfaces opposing each other radially and exerting radially directed sealing force against each other, wherein the sealing surfaces are shaped and dimensioned such that said radially directed sealing force therebetween is substantially constant for any relative rotational position where the sealing surfaces engage one another, wherein the housing comprises a body and a grip portion which is rotatable relative to the body and on rotation provides a dose of powder for inhalation, and the screw thread and the sealing surface on the housing are provided on the grip portion, and the sealing surface on the grip portion is disposed axially forward, in the direction of fitting the cap to the housing, of the screw thread on the grip portion. |
