Gas pressure driven infusion system by hydrogel electrolysis
US5354264A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 17, 1993 |
| Grant date | Oct 11, 1994 |
| Priority date | — |
| Expiry date | Feb 17, 2013 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/14204
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A drug delivery device is described which utilizes gas pressure from free oxygen and hydrogen derived from the electrolysis of water at the electrodes in negatively charged polymeric hydrogels by electro-osmosis. The gas pressure forces the infusion of the drugs through appropriate means into the body. The rate of electrolysis which produces the oxygen and hydrogen is controlled by an electric current. Therefore the rate of drug delivery can be predetermined and precisely controlled. The current is activated and controlled by an electronic timer or a biomedical control system. The negatively charged hydrogel polymers have mechanical strength and rigidity and allow water to flow through the polymer network toward the cathode ensuring a continuous water supply to the electrodes inside the hydrogel system by electro-osmosis. The hydrogels may be recharged (reswollen) with water or simply replaced. Because the containment of water within the hydrogel structure is not position dependent, gravity plays no part in the gel location within the gas generation unit as in prior art units. Therefore, the contact between the electrodes and water for purposes of electrolysis is position independe…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.