| 摘要 |
A metering valve 1 is provided for a pressurised container 14 containing a pharmaceutical formulation. The valve has a stem 2 with a central flange 11 and a hollow open end 19 with a side port 20. The stem slides in a body 3 having larger and smaller diameter portions, and being closed off by a seal 4 against which the flange 11 rests in an inoperative position. A second seal is located around the stem on the opposite side of the flange and trapped by a spring 6 which urges the stem into its inoperative position. When the stem is depressed, the inner seal 5 forms a sliding seal with the smaller diameter portion of the body to define a metering chamber (13) filled with the pharmaceutical. Continued depression opens the side hole 20 to allow the contents of the metering chamber to be dispensed, wherein at least one of the sealing gasket 8 or the inner seal 5 is formed as a co-moulding with at least a part of the valve body 3 or the valve stem, respectively. Also disclosed is a dispensing apparatus containing a dosage counter. |
