Method and apparatus for the production of ionic cloths for use in ionic dressings
申请人:RICOH KYOSAN INC.
公开号:EP0395476A2
公开(公告)日:1990-10-31
Novel wound dressings and methods and systems for preparing them are provided herein. The wound dressing includes a substrate at least part of which is cellulosic and which has been chemically modified to have ionic-adsorbing sulfate sites thereon. A cationic form of a physiologically- or biologically-active agent is adsorbed therein. Upon contact with body exudate from wounds to which such wound dressing is applied, the physiologically- or biologically-active agent is released in a controlled manner by ion exchange with the ions in the exudate, in proportion to the amount of the exudate. This is due to the fact that the adsorption is by means of an ionic bond. The strength of such ionic bond is such that the controlled release is achieved. This controlled release thus reduces unnecessary exposure of unwounded skin surface to the physiologically-or biologically-active agent. Commercially-viable methods and systems are also provided for producing substrates for the production of such wound dressings. The method includes the steps of soaking the substrate by passing the substrate through a bath of an appropriate chemical reactant solution, and squeezing the excess solution from the soaked substrate to provide a wetted substrate. In the improved method, the following additional steps are carried out, namely, the wetted substrate is supported on a suitable backing member which substantially inhibits the escape of such solution from the environment of the wetted substrate, preferably by first cutting the wetted substrate to a selected length. The so-supported substrate is cured in a heating means to provide the derivatized substrate. The so-cured derivatized substrate is washed. Finally, the washed derivatized substrate is suitably dried.
本文提供了新型伤口敷料及其制备方法和系统。伤口敷料包括一种基质,其中至少有一部分是纤维素,并经过化学改性,使其具有离子吸附硫酸盐位点。其中吸附有生理或生物活性剂的阳离子形式。在与伤口渗出物接触时,生理活性剂或生物活性剂会通过与渗出物中的离子进行离子交换,以可控的方式释放出来,释放量与渗出物的量成比例。这是因为吸附是通过离子键进行的。这种离子键的强度可以实现控制释放。因此,这种控制释放可减少未受伤皮肤表面不必要地接触生理或生物活性剂。还提供了商业上可行的方法和系统,用于生产这种伤口敷料的基材。该方法包括以下步骤:通过适当的化学反应剂溶液槽浸泡基质,并从浸泡的基质中挤出多余的溶液,以提供润湿的基质。在改进的方法中,还进行了以下步骤,即把浸湿的基片支撑在适当的支撑件上,该支撑件基本上能抑制溶液从浸湿基片的环境中逸出,最好是先把浸湿的基片切割成选定的长度。如此支撑的基底在加热装置中固化,以提供衍生化基底。将固化后的衍生基底进行洗涤。最后,将洗净的衍生化基底适当干燥。