# US 9,517,164 B2 · Wound dressing with advanced fluid handling

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- Number: US 9,517,164 B2
- Document ID: US9517164B2
- Status: Granted
- Kind: B2
- Application number: 12/894,584
- Filed: 2010-09-30
- Published: 2012-04-05
- Granted: 2016-12-13
- Earliest claimed: 2010-09-30
- Assignees: Covidien LP
- Applicants: Ronald F. Vitaris; Kevin M. Corley
- Inventors: Ronald F. Vitaris; Kevin M. Corley
- Web page: https://patentgrep.com/patent/US9517164B2

## CPC

- A61F 13/0203: with fluid retention members
- A61F 13/0276: {Apparatus or processes for manufacturing adhesive dressings or bandages}
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)

## Abstract

A wound dressing for managing wound fluids includes a porous contact layer for positioning adjacent a wound. An internal open window extends through the contact layer exposing a distal side of an absorbent member. The absorbent member is disposed in a superimposed relation to the window of the contact layer and is dimensioned to extend laterally beyond the window such that a portion of the absorbent member overlaps and is secured to the contact layer. A drape layer is disposed on a proximal side of the absorbent member, and is adhesively coated to fasten the drape layer to the absorbent member. A cover layer disposed over the drape layer defines an internal open window such that the open window is adjacent the absorbent member. A distal side of the cover layer is adhesively coated to secure the cover layer to the contact layer.

## Claims

### Claim 1

A wound dressing, which comprises:
a porous contact layer for positioning adjacent a wound, wherein material of the porous contact layer is porous for permitting transmission of wound fluids and moisture vapor there through, the porous contact layer defining a distal wound-facing surface and an opposed proximal surface, the porous contact layer defining a distal window extending there through;
an absorbent member disposed in superimposed relation to the distal window of the porous contact layer, the absorbent member dimensioned to extend laterally beyond the distal window such that a portion of the absorbent member overlaps and is secured to the proximal surface of the porous contact layer;
a drape layer disposed on a proximal side of the absorbent member, a distal side of the drape layer adhesively coated to fasten the drape layer to the absorbent member; and
a cover layer defining a proximal window, the cover layer disposed over the drape layer such that the proximal window is adjacent the absorbent member, a distal side of the cover layer adhesively coated to secure the cover layer to the porous contact layer.

### Claim 2 (depends on 1)

The wound dressing according to claim 1, wherein at least about 50% of the surface area of a distal side of the absorbent member is exposed to a distal side of the dressing through the distal window of the porous contact layer.

### Claim 3 (depends on 2)

The wound dressing according to claim 2, wherein at least about 85% of the surface area of the distal side of the absorbent member is exposed through the distal window of the porous contact layer.

### Claim 4 (depends on 3)

The wound dressing according to claim 3, wherein the absorbent member defines a generally rectangular shape, and wherein the distal window of the porous contact layer defines a generally circular shape.

### Claim 5 (depends on 4)

The wound dressing according to claim 4, wherein the absorbent member is constructed of an open-celled polyurethane foam.

### Claim 6 (depends on 3)

The wound dressing according to claim 3, wherein the absorbent member defines a generally rectangular shape, and wherein the distal window of the porous contact layer defines a generally oval shape.

### Claim 7 (depends on 1)

The wound dressing according to claim 1, wherein the porous contact layer includes a plurality of perforations exhibiting a diameter in a range of 200 to 1000 microns and spaced such that the porous contact layer exhibits a perforation density in a range of 50 to 300 perforations per square inch.

### Claim 8 (depends on 7)

The wound dressing according to claim 7, wherein the perforations exhibit a diameter of 500 microns, and wherein the perforation density of the porous contact layer is 85 microns per square inch.

### Claim 9 (depends on 7)

The wound dressing according to claim 7, wherein the porous contact layer is constructed as a composite including a thin film substrate component coated on a distal side with a pressure sensitive, wound-side adhesive component, and coated on a proximal side with a construction adhesive component, the plurality of perforations extending through each of the thin film substrate component, the pressure sensitive, wound-side adhesive component, and the construction adhesive component in substantial alignment.

### Claim 10 (depends on 1)

The wound dressing according to claim 1, wherein the porous contact layer includes a layer of a cross linked, acrylic-based construction adhesive on a proximal side thereof, the cross linked, acrylic-based construction adhesive adhering the absorbent member to the porous contact layer.

### Claim 11 (depends on 10)

The wound dressing according to claim 10, wherein the distal side of the drape layer is adhesively coated with a patterned coating of the cross linked, acrylic-based construction adhesive.

### Claim 12 (depends on 1)

The wound dressing according to claim 1, wherein at least 50% of the surface area of a distal side of the absorbent member is exposed to a distal side of the dressing through the distal window of the porous contact layer.

### Claim 13

A wound dressing, which comprises:
an absorbent member defining a distal wound-facing surface and an opposed proximal surface, the distal wound facing surface defining a surface area;
a porous contact layer defining a distal window extending therethrough, the porous contact layer including a thin film membrane having a pressure sensitive, wound-side adhesive on a distal side thereof and a continuous coating of a construction adhesive on a proximal side thereof, and wherein the proximal side of the porous contact layer is adhered to the distal wound facing surface of the absorbent member such that at least about 50 percent of the surface area of the distal side of the absorbent member is exposed to a distal side of the wound dressing through the distal window; and
a backing layer including a patterned coating of the construction adhesive on a distal side thereof, the backing layer adhered to the proximal side of the absorbent member by the patterned coating of the construction adhesive, the construction adhesive configured to permit separation of the backing layer from the absorbent member upon swelling of the absorbent member.

### Claim 14 (depends on 13)

The wound dressing according to claim 13, wherein the patterned coating of the construction adhesive is in a range of 0.4 to 0.6 grams of adhesive per 100 square inches of surface area of the backing layer.

### Claim 15 (depends on 14)

The wound dressing according to claim 14, wherein the backing layer is constructed as a composite including a drape layer adhered to the absorbent member by the patterned coating of the construction adhesive on a distal side thereof, and a cover layer defining a proximal window, the cover layer adhered to a proximal side of the drape layer by a coating of the construction adhesive.

### Claim 16 (depends on 14)

The wound dressing according to claim 14, wherein the cover layer is adhered to a proximal side of the drape layer by a patterned coating of the construction adhesive.

### Claim 17 (depends on 14)

The wound dressing according to claim 14, wherein the cover layer is adhered to a proximal side of the drape layer by a continuous coating of the construction adhesive.

### Claim 18 (depends on 14)

The wound dressing according to claim 14, wherein an outer edge of the cover layer is coincident with an outer edge of the porous contact layer and an outer edge of the drape layer is coincident with an outer edge of the absorbent member.

### Claim 19 (depends on 13)

The wound dressing according to claim 13, wherein the absorbent member is constrained between the backing layer and the porous contact layer such that upon swelling the absorbent member migrates primarily in a distal direction through the distal window of the porous contact layer.

### Claim 20 (depends on 13)

The wound dressing according to claim 13, wherein at least 50 percent of the surface area of the distal side of the absorbent member is exposed to a distal side of the wound dressing through the distal window.