Hydrogen peroxide disinfecting system for contact lenses
US4880601A · kind A · utility
14Cited by
4References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1985 |
| Grant date | Nov 14, 1989 |
| Priority date | — |
| Expiry date | Sep 27, 2005 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61L12/124
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A system and method for disinfecting contact lenses with a stabilized hydrogen peroxide solution and a separate neutralizing solution are described. Sodium stannate (a.k.a. sodium tin oxide) is utilized to stabilize the hydrogen peroxide, and sodium thiosulfate is utilized to neutralize the hydrogen peroxide. In addition to sodium thiosulfate, the neutralizing solution also contains a complexing agent capable of sequestering tin, such as EDTA or EGTA. The system and method provide improvements over prior hydrogen peroxide disinfection systems with respect to stability, predictability and rate of reaction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.