초록 ▼

A device is disclosed for supplying and delivering an useful agent. The device comprises (1) a housing defining an internal space, (2) a flexible container in the housing and having a passageway for connecting the container with the exterior of the device, (3) a useful agent in the container, and (4

A device is disclosed for supplying and delivering an useful agent. The device comprises (1) a housing defining an internal space, (2) a flexible container in the housing and having a passageway for connecting the container with the exterior of the device, (3) a useful agent in the container, and (4) a gas generating means located between the housing and the container. In operation, when the device is in a fluid environment, fluid is admitted into the device and contacts the means, causing it to produce a gas that exerts pressure against the container. The pressure urges the container to decrease its dimensions and correspondingly deliver agent through the passageway from the device. Also, article of manufactures are enclosed, which articles consists of a gas generating means between two different polymeric films, and a gas generating means housed in a polymeric matrix.

대표청구항 ▼

A device for delivering a useful agent to an environment of use, comprising: (a) a useful agent; (b) a housing comprising a shape-retaining wall formed of a semipermeable polymer that defines an internal space and has an opening that connects the space with the exterior of the device; (c) a containe

A device for delivering a useful agent to an environment of use, comprising: (a) a useful agent; (b) a housing comprising a shape-retaining wall formed of a semipermeable polymer that defines an internal space and has an opening that connects the space with the exterior of the device; (c) a container in the housing, said container comprising a flexible wall surrounding a reservoir for storing the agent, and a passageway that passes through the opening for delivering the agent from the container to the exterior of the device; and, (d) means for generating a gas in the device interposed between the housing and the container, said means generating gas in response to fluid admitted into the device, which gas exerts pressure on the container causing it to decrease in volume and correspondingly delivers agent through the passageway from the device in a unit time.