Device for dispensing a liquid particularly useful for delivering medicaments at a predetermined rate
US5062834A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 1989 |
| Grant date | Nov 5, 1991 |
| Priority date | — |
| Expiry date | Aug 15, 2009 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/14204
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A device for dispensing a liquid, particularly a medicament, at a predetermined rate, includes a container including a displaceable partition to define a first expansible-contractible chamber on one side for receiving the liquid to be dispensed, and a second expansible-contractible chamber on the opposite side for receiving an electrolytic cell. The electrolytic cell has electrodes and an electrolyte capable of generating, upon the energization of the electrodes, a gas under pressure to thereby displace the displaceable partition and to force the liquid out from the first chamber in accordance with the rate of energization of the electrodes. The displaceable partition includes a piston assembly having a pair of pistons spaced apart by a connecting stem, the container being formed with a vent opening in the space between the pistons to prevent accidental mixing of the gas with the liquid to be dispensed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.