# US 2014/0194836 A1 · Dressing assemblies for wound treatment using reduced pressure

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- Number: US 2014/0194836 A1
- Document ID: US20140194836A1
- Status: Published application
- Kind: A1
- Application number: 14/175,743
- Filed: 2014-02-07
- Published: 2014-07-10
- Earliest claimed: 2008-05-30
- Assignees: KCI Licensing, Inc.
- Applicants: KCI Licensing, Inc.
- Inventors: Richard Marvin Kazala, JR.; Justin Alexander Long; Eric Woodson Barta; Li Yao; Robert Peyton Wilkes
- Web page: https://patentgrep.com/patent/US20140194836A1

## CPC

- A61F 13/022: {having more than one layer with different fluid retention characteristics}
- A61F 13/00059: {provided with visual effects, e.g. printed or colored}
- A61F 13/01017: {synthetic, e.g. polymer based}
- A61F 13/01029: {made of multiple layers}
- A61F 13/01034: {characterised by a property}
- A61F 13/01038: {Flexibility, stretchability or elasticity}
- A61F 13/0209: {comprising superabsorbent material}
- A61F 13/0223: {characterized by parametric properties of the fluid retention layer, e.g. absorbency, wicking capacity, liquid distribution}
- A61F 13/0243: {characterised by the properties of the skin contacting layer, e.g. air-vapor permeability}
- A61F 13/0289: {manufacturing of adhesive dressings}
- A61F 13/05: specially adapted for use with sub-pressure or over-pressure therapy, wound drainage or wound irrigation, e.g. for use with negative-pressure wound therapy [NPWT]
- A61F 15/008: {Appliances for wound protecting, e.g. avoiding contact between wound and bandage (corn plasters A61F13/063)}
- A61H 1/008: {Apparatus for applying pressure or blows almost perpendicular to the body or limb axis, e.g. chiropractic devices for repositioning vertebrae, correcting deformation}
- A61L 15/60: Liquid-swellable gel-forming materials, e.g. super-absorbents
- A61M 1/71: {Suction drainage systems (containers therefor A61M1/60, A61M1/64; negative pressure wound therapy systems A61M1/90)}
- A61M 1/915: {Constructional details of the pressure distribution manifold}
- A61M 1/917: {specially adapted for covering whole body parts}
- A61F 13/00: Bandages or dressings (radioactive dressings {A61N5/1029}); Absorbent pads
- A61F 2013/00131: {elasticity distribution}
- A61F 2013/00136: {anisotropy}
- A61F 2013/00174: {possibility of applying pressure}
- A61F 2013/00182: {with transparent part}
- A61F 2013/00246: {in a special way pervious to air or vapours}
- A61F 2013/0028: {applying of mechanical pressure; passive massage}
- A61F 2013/00536: {for draining or irrigating wounds}
- A61F 2013/0054: {for deep wounds}
- A61F 2013/00748: {with hydrocolloids or superabsorbers}
- A61M 1/916: {specially adapted for deep wounds}
- A61M 2205/70: with testing or calibration facilities
- A61M 2207/00: Methods of manufacture, assembly or production
- A61M 2210/1007: Breast; mammary
- A61M 2210/1021: Abdominal cavity
- Y10T 29/49: Method of mechanical manufacture
- Y10T 29/49826: Assembling or joining
- 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)
- A61H: PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY (electrotherapy, magnetotherapy, radiation therapy or ultrasound therapy A61N)
- A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K)
- A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)}
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A dressing assembly for use with a reduced pressure treatment system, the dressing assembly develops a directed force under reduced pressure. The directed force may be a radial force or a closing force. The dressing assembly includes a shaped dressing bolster having a shaped extremity that is operable to evenly deliver the radial force and to distribute reduced pressure. Numerous shapes may be used for the shaped extremity. The dressing assembly may further include an over-drape to assist in creating a seal over the shaped dressing bolster and against a portion of a patient's epidermis.

## Claims

### Claim 1

A dressing assembly for use with a reduced pressure treatment system, the dressing assembly comprising:
a dressing bolster having a first surface, a second surface, and an oblique extremity; and
a comfort layer coupled to the second surface of the dressing bolster;
wherein the dressing bolster is configured to distribute a directed force when under a reduced pressure.

### Claim 2 (depends on 1)

The dressing assembly of claim 1, further comprising an over-drape disposed over the first surface of the dressing bolster.

### Claim 3 (depends on 1)

The dressing assembly of claim 1, further comprising:
an over-drape disposed over the first surface of the dressing bolster; and
wherein the over-drape comprises an anisotropic material.

### Claim 4 (depends on 1)

The dressing assembly of claim 1, wherein the dressing bolster further comprises a plurality of flexibility notches formed on the first surface.

### Claim 5 (depends on 1)

The dressing assembly of claim 1, wherein the dressing bolster comprises a trapezoidal cross-section in two orthogonal planes.

### Claim 6 (depends on 1)

The dressing assembly of claim 1, wherein the dressing bolster comprises an arcuate cross-section in two orthogonal planes.

### Claim 7 (depends on 1)

The dressing assembly of claim 1, wherein the dressing bolster comprises an elliptical cross-section in two orthogonal planes.

### Claim 8 (depends on 1)

The dressing assembly of claim 1, wherein the dressing bolster comprises an isotropic material.

### Claim 9 (depends on 1)

The dressing assembly of claim 1, wherein the dressing bolster comprises an anisotropic material.

### Claim 10 (depends on 1)

The dressing assembly of claim 1, wherein the dressing bolster comprises:
a first bolster layer formed from a hydrophilic foam; and
a second bolster layer formed from a hydrophobic foam;
wherein the first bolster layer and the second bolster layer are adjacently disposed.

### Claim 11 (depends on 1)

The dressing assembly of claim 1, wherein the dressing bolster comprises a reticulated foam having a density greater than 25.6 kg/m3.

### Claim 12 (depends on 1)

The dressing assembly of claim 1, wherein the dressing bolster comprises a reticulated foam having a density greater than 80.0 kg/m3.

### Claim 13 (depends on 1)

The dressing assembly of claim 1, wherein the dressing bolster comprises a reticulated foam having a density less than a density of epidermis tissue.

### Claim 14 (depends on 1)

The dressing assembly of claim 1, further comprising an inner layer having a first surface and a second, inward-facing surface and wherein the first surface of the inner layer is coupled, at least in part, to a portion of the first surface of the shaped dressing bolster.

### Claim 15 (depends on 1)

The dressing assembly of claim 1, further comprising:
an over-drape;
a plurality of flexibility notches formed on the first surface of the dressing bolster; and
wherein the oblique extremity makes an angle alpha (α) with a normal reference and wherein the angle alpha (α) is in a range between 25 degrees and 65 degrees (65°>α>25°).

### Claim 16

A dressing assembly for use with a reduced pressure treatment system, the dressing assembly comprising:
a dressing bolster comprising an oblique extremity, a first surface, and a second surface;
an over-drape disposed over the oblique extremity and the first surface, wherein the over-drape extends beyond the dressing bolster to form a drape extension; and
an adhesive perimeter strip coupled to the drape extension and operable to provide a seal between a patient and the over-drape.

### Claim 17 (depends on 16)

The dressing assembly of claim 16, further comprising an inner layer having a first surface and a second surface and wherein the first surface of the inner layer is coupled, at least in part, to a portion of the second surface of the dressing bolster.

### Claim 18 (depends on 16)

The dressing assembly of claim 16, wherein the dressing bolster comprises a medical bolster material and wherein the medical bolster material is an isotropic material.

### Claim 19 (depends on 16)

The dressing assembly of claim 16, wherein the dressing bolster comprises a medical bolster material and wherein the medical bolster material is an anisotropic material.

### Claim 20

A dressing assembly for use with a reduced pressure treatment system, the dressing assembly comprising:
a dressing bolster comprising a medical bolster material forming a first surface, a second surface, and an oblique extremity;
a drape configured to be disposed over the first surface of the dressing bolster; and
a drape sealing apparatus coupled to the drape for sealing the drape to an epidermis;
wherein the medical bolster material has a density greater than 20 kg/m3; and
wherein the dressing bolster has a characteristic of evenly distributing a directed force under a reduced pressure.

### Claim 21 (depends on 20)

The dressing assembly of claim 20, wherein the medical bolster material is a manifold material.

### Claim 22 (depends on 20)

The dressing assembly of claim 20, wherein the drape comprises an anisotropic material.

### Claim 23 (depends on 20)

The dressing assembly of claim 20, wherein the oblique extremity is chamfered.

### Claim 24 (depends on 20)

The dressing assembly of claim 20, wherein the oblique extremity is arcuate.

### Claim 25 (depends on 20)

The dressing assembly of claim 20, wherein the oblique extremity forms an angle with a normal reference that is greater than five degrees.

### Claim 26

A method of manufacturing a shaped dressing bolster for use with a reduced pressure treatment system, the method comprising:
providing a medical bolster material; and
forming a shaped dressing bolster having a first surface, a second surface, and an oblique extremity, wherein the shaped dressing bolster is formed from the medical bolster material;
wherein the shaped dressing bolster is operable to distribute reduced pressure and to evenly distribute a radial, compressive force.

### Claim 27 (depends on 26)

The method of manufacturing a shaped dressing bolster of claim 26, further comprising coupling a comfort layer to the second surface of the shaped dressing bolster.

### Claim 28 (depends on 26)

The method of manufacturing a shaped dressing bolster of claim 26, further comprising coupling an over-drape to the first surface of the shaped dressing bolster.

### Claim 29 (depends on 26)

The method of manufacturing a shaped dressing bolster of claim 26, wherein forming a shaped dressing bolster comprises forming a trapezoidal cross-section in two orthogonal planes.

### Claim 30 (depends on 26)

The method of manufacturing a shaped dressing bolster of claim 26, wherein forming a shaped dressing bolster comprises forming a cross-section with an arcuate portion in two orthogonal planes.

### Claim 31 (depends on 26)

The method of manufacturing a shaped dressing bolster of claim 26, wherein forming a shaped dressing bolster comprises:
providing a block of reticulated foam having a density greater than 20 kg/m3;
cutting the reticulated foam to a desired height;
laminating a comfort layer to the reticulated foam; and
cutting the reticulated foam with a die to form the shaped dressing bolster.