Infection-resistant polyurethane foams, method for producing the same and use thereof in antiseptic wound dressing

Abstract

The present invention describes microbicidal hydrophilic polyurethane foams endowed with polyhexamethylenebiguanide (PHMB) and / or its hydrochloride and also a superabsorbent, wound contact materials obtainable therefrom and processes for producing the therapeutically endowed polyurethane foams and the wound contact materials obtainable therefrom.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a Divisional of U.S. application Ser. No., 11 / 722,284, filed Jun. 20, 2007, which is a 35 U.S.C. §371 National Stage Application of Interntational Application No. PCT / EP2005 / 013340, filed Dec. 13, 2005, and claims priority to DE 102004061406.7 filed Dec. 21, 2004. The entire contents of each application is incorporated herein by reference.BACKGROUND[0002]1. Field of Invention[0003]The present application relates to an infection-resistant polyurethane foam, in particular a hydrophilic polyurethane foam, in which the antiseptic polyhexamethylenebiguanide (PHMB) and / or its hydrochloride is present in the PU foam layer in microparticulate and / or homogeneously dissolved form as well as a superabsorbent, a process for its production and its use in wound contact materials.[0004]2. Description of Related Art[0005]There is a general commitment in medicine to use infection-resistant materials to achieve the best possible control...

AI Technical Summary

Benefits of technology

[0027]Proceeding from the prior art, it is accordingly an object of the present invention to produce a suitable microbicidal polymeric material for medical applications, in particular for the production of wound contact materials, which ensures an optimal and prolonged bioavailability of the antiseptic, is capable of taking up excess wound exudate in the process, permits air and moisture exchange and is simple and inexpensive to fabricate.

Problems solved by technology

Large or chronic wounds are particularly prone to become infected.

Release of the therapeutic ingredient from the micelles is limited to the micelles close to the surface.

Here, the covalent bonding to the supporting PU foam means that bioavailability is only limited.

The additional use of the biocidal metallic material makes the fabrication of the wound contact materials obtained therefrom inconvenient and costly.

Cellulose as a carrier material has the disadvantage of tending to stick to the wound, and this makes changing the dressing inconvenient and may impair the healing process.

The presence of PHMB in the adhesive layer, however, cannot preclude the possibility of the rest of the dressing material being colonized by bacteria.

Hydrogelic adhesive layers generally have but a very limited capacity for taking up wound exudate.

Since, frequently, a polymeric foam layer has to be additionally included for this purpose, fabrication of the wound dressing becomes inconvenient and costly.

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