Negative pressure wound therapy apparatus

A negative pressure wound therapy apparatus, comprising:

• a wound dressing comprising a first dressing portion and a second dressing portion overlying the first dressing portion,
• the first dressing portion comprising:
• a tissue contact layer configured to be positioned in contact with a wound and/or skin surrounding a wound, wherein the tissue contact layer comprises a first border portion at a perimeter of the tissue contact layer;
• a first dressing layer;
• and
• a first backing layer comprising a first aperture, wherein the first backing layer comprises a second border portion at a perimeter of the first backing layer, wherein the first dressing layer is positioned between the tissue contact layer and the first backing layer and the first border portion of the tissue contact layer is directly bonded to the second border portion of the first backing layer;
• and
• the second dressing portion comprising:
• an intermediate drape comprising a second aperture, wherein the intermediate drape comprises a third border portion at a perimeter of the intermediate drape;
• a second dressing layer, and
• a second backing layer comprising a fourth border portion at a perimeter of the second backing layer, wherein the second dressing layer is positioned between the intermediate drape and the second backing layer and the third border portion of the intermediate drape is directly bonded to the fourth border portion of the second backing layer;
• and
• wherein the second dressing portion is attached to the first dressing portion such that the first aperture and the second aperture are fluidly connected, and wherein the second border portion of the first backing layer is unattached and not bonded to the third border portion of the intermediate drape.

A method of treating a wound with a negative pressure wound therapy apparatus, comprising:

• positioning a wound dressing over the wound, the wound dressing comprising:
• a first portion and a second portion, the first portion comprising:
• a tissue contact layer configured to be positioned in contact with a wound and/or skin surrounding a wound, wherein the tissue contact layer comprises a first border portion at a perimeter of the tissue contact layer;
• a first dressing layer;
• and
• a first backing layer comprising a first aperture, wherein the first backing layer comprises a second border portion at a perimeter of the first backing layer, wherein the first dressing layer is positioned between the tissue contact layer and the first backing layer and the first border portion of the tissue contact layer is directly bonded to the second border portion of the first backing layer;
• and
• the second portion comprising:
• an intermediate drape comprising a second aperture, wherein the intermediate drape comprises a third border portion at a perimeter of the intermediate drape;
• a second dressing layer, and
• a second backing layer comprising a fourth border portion at a perimeter of the second backing layer, wherein the second dressing layer is positioned between the intermediate drape and the second backing layer and the third border portion of the intermediate drape is directly bonded to the fourth border portion of the second backing layer;
• wherein the second portion is attached to the first portion such that the first aperture and the second aperture are fluidly connected, and wherein the second border portion of the first backing layer is unattached and not bonded to the third border portion of the intermediate drape;
• and
• applying negative pressure through a third aperture in the second backing layer, wherein the first, second, and third apertures provide fluid communication between a source of negative pressure and the wound.