Amphoteric N-substituted acrylamide hydrogel and method
US5525356A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 1991 |
| Grant date | Jun 11, 1996 |
| Priority date | — |
| Expiry date | Nov 14, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2666/04
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A polymeric, amphoteric hydrogel for use in medical devices and medical devices using the hydrogel. The hydrogel has a first polymer repeating unit having a acid group and a second polymer repeating unit having a base group such that the acid groups and base groups are present in the hydrogel in amounts effective to provide a hydrogel with a strong, amphoteric, nonmobile ionic structure. For example, the hydrogel can be a copolymer of 2-acrylamido-2-methylpropane sulfonic acid and methacrylamido-propyl-trimethylammonium hydroxide. The hydrogel can be an adhesive used to adhere medical devices to the skin of a patient. It can be particularly useful in drug delivery applications such as in iontophoresis devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.