Reinforced adhesive backing sheet
View Patent ↗A backing sheet for use in a wound dressing, comprising a semipermeable continuous film laminated to an adhesive-coated apertured layer, wherein the apertured layer comprises a solid substrate coated with a medically acceptable adhesive. Also provided is a method of making a backing sheet for use in a wound dressing, said method comprising the steps of: forming an adhesive-coated apertured layer by coating a medically acceptable adhesive onto an apertured solid substrate, followed by laminating the adhesive-coated apertured layer to a semipermeable continuous film.
1. A wound dressing, comprising:
a backing sheet; and
a wound contacting sheet comprising at least one absorbent layer;
wherein the backing sheet comprises an apertured layer and a continuous film laminated to the apertured layer, the film being impermeable to wound exudates and to microorganisms and permeable to water vapor;
wherein the apertured layer comprises an apertured substrate coated with a medically acceptable adhesive; and
wherein the apertured layer is laminted between the wound contacting sheet and the continuous film.
2. A wound dressing according to claim 1 , wherein a basis weight of the adhesive is from 25 to 75 gsm.
3. A wound dressing according to claim 1 , wherein the continuous film has a thickness of from 20 micrometers to 75 micrometers.
4. A wound dressing according to claim 1 which is sterile, and packaged in a microorganism-impermeable container.
5. The wound dressing of claim 1 , wherein the apertured substrate further comprises a thermoplastic net.
6. The wound dressing of claim 1 , wherein a percent open area of the apertured layer is from 10% to 60%.
7. The wound dressing of claim 1 , wherein the apertured layer comprises apertures adapted to allow passage of gas.
8. A method of making a backing sheet, comprising:
forming an apertured layer by coating a medically acceptable adhesive onto an apertured substrate; and
laminating the apertured layer between a continuous film and a wound contacting sheet comprising at least one absorbent layer;
wherein the continuous film is permeable to water vapor, but impermeable to wound exudates and microorganisms.
9. The method of claim 8 wherein coating is carried out by spraying or dipping followed by passing between rollers to remove excess adhesive.
10. The method of claim 8 further comprising applying a removable cover sheet to the wound contacting sheet.
11. The method of claim 8 , wherein a basis weight of the adhesive is from 25 to 75 gsm.
12. The method of claim 8 , wherein the apertured substrate comprises a unitary thermoplastic net.
13. The method of claim 8 , wherein the continuous film has a thickness of from 20 micrometers to 75 micrometers.