| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide alternative means of providing assessment visually by providing expensive counters for counting the number of operations of a valve to enable a user to assess the number of doses remaining to solve the conventional problem in which as sources of medicament having metered dose release valves conventionally are provided with aluminium containers of the medicament, the user cannot see the amount of medicament left.SOLUTION: A medicament source 1 has a container 2 and a crimped closure 3. The container is made of transparent or semi-transparent polymer and has an outer, perforate sleeve of aluminum, providing mechanical strength for pressure retention. The polymer is composed of three layers. The innermost layer is made of PTFE material to provide an inert layer with which the medicament and its propellant will not react or combine in any way. The middle layer is made of nylon material to provide a propellant tight layer, to contain the propellant, whose molecules may be able to pass through the PTFE layer. The outer layer is made of polypropylene to provide both water tightness and mechanical integrity of the container.</p> |
