Polyurethane dressing and method for making same
AssigneeHydrofera, LLC
InventorThomas J. Drury
Life of this patent
Estimating the term…
Abstract
The present invention is directed toward a wound dressing comprising a foam body made of polyurethane material treated with a plurality of colored biocidal dyes with at least one of the dyes being gram positive and at least one of the dyes being gram negative to dye the body a distinct color. The body has at least one planar surface and ranges from about 1 mm to about 10 mm in thickness and has an outer film cover and border with a hydrogel adhesive secured to the body. The foam body changes color when placed in contact with an infected wound site.
Claims20
A wound dressing comprising a body made of sterilized polyurethane foam material treated with a plurality of colored biocidal dyes having non-oxidant gram-positive and gram-negative characteristics to bind the dyes to binding sites in the polyurethane, said dyes imparting in the wound dressing body a distinct color, said body ranging from about 1 mm to about 10 mm in thickness and having an repositional adhesive cover and border secured to said body, said body when placed in contact with an infected wound site changing color.
A sterilized wound dressing comprising a body section made of polyurethane foam material treated to open binding sites to a plurality of colored biocidal dyes with at least one of said dyes being gram positive and at least one of the said dyes being gram negative bonded to said polyurethane foam material, said dyes coloring the body section a distinct color, said body section ranging from about 1 mm to about 10 mm in thickness and a plastic film cover and border with a hydrogel adhesive secured to said cover and border providing means to reposition said wound dressing on a patient, said body section when placed in contact with an infected wound site changing color indicating an infection.
A method of constructing a color change wound dressing comprising the steps of:
- a). washing a polyurethane foam sheet to eliminate wetting agents;
- b). prepping the foam sheet with an alcohol solution;
- c). applying a plurality of colored biocidal dyes to the prepped foam sheet, for a suitable period of time to bind said dyes to the polyurethane foam at a concentration ranging from at least 0.00025 grams per gram to not more than 0.0005 grams per gram of dye for every gram of foam;
- d). washing the dyed polyurethane foam sheet to remove unbound dye;
- e). adding wetting agents to the polyurethane foam sheet;
- and
- f). removing excess liquid from the foam sheet and drying the polyurethane dyed foam.
A method of constructing a color changing wound dressing comprising the steps of:
- a). washing a formed polyurethane foam sheet to eliminate foaming agents;
- b). prepping the foam sheet with an alcohol solution for at least 5 minutes;
- c). applying a plurality of colored biocidal dyes to the prepped foam sheet, for a suitable period of time to bind said dyes to the polyurethane foam at a concentration ranging from at least about 0.00015 g/g to about 0.00035 g/g;
- d). washing the dyed polyurethane foam sheet a plurality of times until the wash water is clear;
- and
- e). removing excess liquid from the foam sheet using a mechanical spin and drying the polyurethane dyed foam sheet;
- f). cutting the foam sheet into sized sections;
- and
- g). applying an adhesive covering to each sized section.
Dependencies are inferred from the claim text.