Therapeutic method for treating acne or isolated pimples and adhesive patch therefor
US6455065B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 18, 1999 |
| Grant date | Sep 24, 2002 |
| Priority date | — |
| Expiry date | May 18, 2019 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61Q19/00
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The skin disorder acne, as well as one or more isolated pimples, are treated by applying to the skin, over the skin disorder, a flexible moisture-containing hydrophilic hydrogel patch that includes a backing support such as paper, cloth or plastic and a water-based hydrogel layer applied to the backing. The hydrogel layer comprises a hydrophilic natural or synthetic polymer dispersed in water to provide body and can be a tacky adhesive. The polymer can comprise any high molecular weight hydrophilic carbohydrate such as karaya, cornstarch, or kelp and/or a synthetic hydrophilic polymer such as polyacrylamide or polyacrylic acid. A humectant such as an alcohol containing two or more hydroxyl groups, i.e., a polyhydric alcohol, keeps the adhesive layer moist. A solute such as salt, protein, sugar or an alcohol is dissolved in the water in a quantity sufficient to raise the osmotic pressure enough to maintain the adhesive hydrogel layer in a hypertonic state with respect to the underlying skin tissue. The hydrogel adhesive which hydrates the upper layer of skin forms a hydrophilic bridge with the patient's skin that allows fluid to be drawn by osmotic pressure from the skin disorder th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.