The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 14, 2002
Filed:
Feb. 18, 1998
Petri Horppu, Göteborg, SE;
Jörgen Friis, Tommerup, DK;
Astra Aktiebolag, Sodertalje, SE;
Abstract
A drug delivery device for delivery of a drug which comprises a mixture of a first substance and a second substance, the device including a first chamber ( ) for housing the first substance, a second chamber ( ) for housing the second substance and a membrane ( ) which on application of a predetermined condition thereto is movable from a first disposition in which it partitions the first and second chambers to prevent mixture of the first and second substances to a second disposition in which it enables the first and second substances to be mixed. In one aspect, the membrane ( ) contains a barrier material comprising polychlorotrifluoroethylene or a copolymer thereof, polyvinylidene chloride or a copolymer thereof or a silicon oxide. In another aspect, the first chamber ( ) is formed from a polyethylene based polymer.