The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 24, 1992
Filed:
Apr. 12, 1990
Ricoh Kyosan, Inc., Tokyo, JP;
Abstract
A wound dressing is provided herein for systemic administration of a physiologically- or biologically-active agent by controlled release of the agent into such wound. The wound dressing includes a substrate in the form of a fabric or cloth, at least a portion of which is cellulosic, which has been chemically modified to convert hydroxyl groups in the cellulosic portion to ionic-adsorbing sites. An ionic form of a physiologically- or biologically-active agent, namely an antibacterial agent, an antifungal agent, an analgesic agent, a tissue healant agent, a local anesthetic agent, an antibleeding agent, an enzyme or a vasoconstrictor is adsorbed in that substrate. Ionic bonds hold that agent temporarily to the substrate for controlled release therefrom in proportion to the amount of exudate in contact with the substrate. The ionic bonds are formed by adsorbing that agent on that substrate at room temperature. The ionic bonds disassociate upon contact with body exudate from wounds to which the wound dressing is applied by ion exchange with ions in the body exudate, thereby to release that agent in an amount in proportion to the amount of the exudate in contact with the substrate.