Carboxymethylated cellulosic wound dressing
View Patent ↗Wound dressings in the form of a body-shaped component are composed of body-shaped cellulosic fabric which has been carboxymethylated at the woundcontacting surface. The body-shaped component composed of a fabric comprising a cellulosic material is subjected to a carboxymethylation process to carboxymethylate the cellulosic material at the wound-contacting surface.
1. A method of manufacturing a wound dressing in the form of a body-shaped component, wherein the wound dressing is composed of carboxymethylated cellulosic fabric and has been obtained by a method comprising the steps of forming a body-shaped component comprising a cellulosic material and subjecting said body-shaped component to a carboxymethylation process to carboxymethylate the cellulosic material at the surface which in use of the dressing contacts a wound, the carboxymethylated body-shaped component having a three dimensional shape as opposed to being flat, its shape being such that when placed on a body part it is able to remain there of its own accord and does not fall off without the aid of an adhesive layer.
2. The method according to claim 1 , wherein the fabric comprising a cellulosic material is a woven, non-woven or knitted fabric composed of fibres of a natural cellulosic substance or of a man-made cellulosic substance or of a mixture of such substances.
3. The method according to claim 2 , wherein the fabric comprising a cellulosic material is composed of cotton or of lyocell or a mixture thereof.
4. The method according to claim 1 , wherein the carboxymethylation process comprises the steps of treating the fabric, either sequentially or simultaneously, with sodium hydroxide and monochloroacetic acid or a salt thereof in the presence of industrial methylated spirits and subjecting the resulting material to a washing step with industrial methylated spirits.
5. the method according to claim 1 , wherein the body-shaped component is in the form of a garment or part thereof.
6. The method according to claim 1 , wherein the cellulosic material includes fibres and the carboxymethylation process is carried out to provide a degree of carboxymethylation such that, upon absorption of moisture, the fibres at the surface of the body-shaped component which in use of the wound dressing contact a wound form a gel but the fabric retains sufficient fibrous character so that the body-shaped component retains its integrity during application to, use on and removal from the wound.
7. The method according to claim 1 , wherein the carboxymethylation process is carried out to carboxymethylate the cellulosic material not only at the surface which in use of the dressing contacts a wound but also to carboxymethylate the cellulosic material remote from that surface.
8. The method according to claim 1 , wherein the body-shaped component is composed of a single piece of fabric.
9. The method according to claim 1 , wherein the body-shaped component is composed of at least two pieces of fabric sewn together with a yarn composed of a material that is not degraded by the carboxymethylation process.
10. The method according to claim 1 , wherein the fabric comprising a cellulosic material also contains non-cellulosic fibre.
11. The method according to claim 10 , wherein the fabric includes a non-cellulosic yam with elastic properties.
12. The method according to claim 1 , wherein it includes the step of providing the dressing with a removable connector.
13. The method according to claim 12 , wherein the removable connector is a pull thread.