Wound dressing
Patent 4997425 Issued on March 5, 1991. Estimated Expiration Date: 
March 29, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 29, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2140026 2533004 2610625 3113568 3648692 3800792 3867520 Medical dressing Multilayer membrane useful as synthetic skin Synthetic membrane for wound-dressings InventorsAssigneeApplicationNo. 501980 filed on 03/29/1990US Classes:604/304, Bandage, pad, or shield placed on body for sustained treatment thereof602/43, Wound contact surface604/369, Foam or cellular structure material604/378Containing layers having differing absorption characteristics (e.g., flow control, wicking, etc.)ExaminersPrimary: Rosenbaum, C. FredAssistant: Rose, Sharon Attorney, Agent or FirmInternational ClassesA61F 013/00A61L 015/00 Foreign Application Priority Data1986-10-31 JPAbstractA wound dressing having a porous layer with a good affinity to tissue of organisms comprising (a) a first layer to be placed on the wound surface having pores of 20 to 500 μm in diameter, and 1 to 10 mm thick, and (b) a second layer remote from the wound surface having pores not more than 20 μm in diameter, and 0.5 to 5 μm thick. The first layer can be provided with an antimicrobial of not more than 50% by weight, and the second layer can contain an antimicrobial of 10 to 80% by weight.Other References
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