초록 ▼

A device for the sustained release of active substance comprises a wall defining a cavity for the reception of active substance, the wall being of impermeable material and having one or more ports therethrough. Sections of hydrogel material are within the cavity, the hydrogel, in use, being swollen

A device for the sustained release of active substance comprises a wall defining a cavity for the reception of active substance, the wall being of impermeable material and having one or more ports therethrough. Sections of hydrogel material are within the cavity, the hydrogel, in use, being swollen to cover the ports in the cavity wall. Active ingredient is released from the container only through the hydrogel covering the ports. In this way sustained and controlled release of the active substance from the device is obtained.

대표청구항 ▼

A sustained release device for releasing active substance from a cavity, when such cavity contains the active substance, through a layer of hydrogel extending across at least one port in a wall made of water-impermeable material, which device comprises: a container having a wall formed from a water-

A sustained release device for releasing active substance from a cavity, when such cavity contains the active substance, through a layer of hydrogel extending across at least one port in a wall made of water-impermeable material, which device comprises: a container having a wall formed from a water-impermeable material, the wall having at least one port therethrough, and which wall defines the cavity for the reception of active substance; and within the container cavity, at least one body of hydrogel material, the hydrogel material, when in the dry state, being capable of being inserted into the container cavity and, when in the swollen condition, extending across the port or ports in the cavity wall and making sealing and pressing contact with the cavity wall adjacent the port or ports, said hydrogel material not being contiguous with the entire cavity wall.