Device and method for wound therapy

• US 9,795,725 B2
• Filed: 09/29/2016
• Issued: 10/24/2017
• Est. Priority Date: 05/11/2006
• Status: Active Grant

• Current Assignee: Smith & Nephew Incorporated (Smith & Nephew PLC)
• Original Assignee: Kalypto Medical, Inc. (Smith & Nephew PLC)
• Inventors: Joshi, Ashok V., Gordon, John Howard, Bhavaraju, Sai, Dayton, Troy C., Heiser, Jeremy
• Primary Examiner(s): Zalukaeva, Tatyana
• Assistant Examiner(s): TREYGER, ILYA Y
• Application Number:
  US15/280,778
• Publication Number:
  US 20170095598A1
• Time in Patent Office: 390 Days
• CPC Class Codes: A61F 13/0206 with absorbent fibrous layers, e.g. woven or non-woven absorbent pads or island dressings
• CPC Class Codes: A61F 13/0213 the fluid retention member being a layer of hydrocolloid, gel forming material
• CPC Class Codes: A61F 13/0243 characterised by the properties of the skin contacting layer, e.g. air-vapor permeability
• CPC Class Codes: 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]
• CPC Class Codes: A61L 15/28 Polysaccharides or their derivatives A61L15/225 takes precedence
• CPC Class Codes: A61L 15/425 Porous materials, e.g. foams or sponges
• CPC Class Codes: A61L 15/58 Adhesives
• CPC Class Codes: A61L 15/60 Liquid-swellable gel-forming materials, e.g. super-absorbents
• CPC Class Codes: A61M 1/73 comprising sensors or indicators for physical values
• CPC Class Codes: A61M 1/74 Suction control underwater drainage A61M1/61
• CPC Class Codes: A61M 1/743 by changing the cross-section of the line, e.g. flow regulating valves A61M1/7413 takes precedence
• CPC Class Codes: A61M 1/78 Means for preventing overflow or contamination of the pumping systems combined with drainage containers A61M1/60
• CPC Class Codes: A61M 1/784 by filtering, sterilising or disinfecting the exhaust air, e.g. swellable filter valves
• CPC Class Codes: A61M 1/882 Draining devices provided with means for releasing antimicrobial or gelation agents in the drained fluid
• CPC Class Codes: A61M 1/90 Negative pressure wound therapy devices, i.e. devices for applying suction to a wound to promote healing, e.g. including a vacuum dressing
• CPC Class Codes: A61M 1/915 Constructional details of the pressure distribution manifold
• CPC Class Codes: A61M 1/962 having pumping means on the suction site, e.g. miniature pump on dressing or dressing capable of exerting suction
• CPC Class Codes: A61M 1/964 having venting means on or near the dressing
• CPC Class Codes: A61M 1/982 with means for detecting level of collected exudate
• CPC Class Codes: A61M 2205/13 with means for the detection of operative contact with patient, e.g. lip sensor
• CPC Class Codes: A61M 2205/15 : Detection of leaks
• CPC Class Codes: A61M 2205/7509 : for virus
• CPC Class Codes: A61M 2205/7518 : bacterial
• CPC Class Codes: A61M 27/00 : Drainage appliance for wounds or the like , i.e. wound drains, implanted drains negative pressure wound therapy devices A61M1/90; implements for holding wound open A61B17/02 ; middle ear drainage A61F11/202

Abstract

A wound therapy device is disclosed. The wound therapy device may include a housing for covering at least a portion of a wound and for sealing to a body surface of a patient. The housing may also include a liquid collector for retaining liquid therein and a vacuum connection for coupling to a vacuum source. The vacuum connection may be in gaseous communication with the liquid collector. The vacuum connection may be separated from the liquid collector by a liquid barrier.

Claims

1. A wound therapy device, comprising:

a liquid-retaining structure configured to absorb wound exudate from a wound site, the liquid-retaining structure comprising superabsorber material;

a porous foam structure positioned over the liquid-retaining structure;

a flexible wound cover positioned over the liquid-retaining structure and the porous foam structure;

a vacuum connection configured to connect the flexible wound cover with a vacuum source, wherein the vacuum connection is in gaseous communication with the liquid-retaining structure through the porous foam structure; and

a wound interface positioned beneath the liquid-retaining structure configured to contact the wound site;

wherein the liquid-retaining structure is configured to absorb wound exudate while simultaneously communicating negative pressure generated by the vacuum source to the wound site.

2. The wound therapy device of claim 1, wherein the porous foam structure is hydrophobic.

3. The wound therapy device of claim 1, wherein the liquid-retaining structure comprises a cellulose material.

4. The wound therapy device of claim 3, wherein the liquid-retaining structure comprises sodium carboxy methyl cellulose.

5. The wound therapy device of claim 1, wherein the liquid-retaining structure is configured to cause exudate to gel while continually providing vacuum passageways.

6. The wound therapy device of claim 1, further comprising a source of negative pressure.

7. The wound therapy device of claim 1, further comprising an adhesive configured to seal the wound therapy device to a body surface of a patient.

8. The wound therapy device of claim 1, further comprising a skin protection layer.

9. The wound therapy device of claim 1, further comprising a nylon layer between the liquid-retaining structure and the porous foam structure.

10. The wound therapy device of claim 1, wherein the wound interface and the liquid-retaining structure are separate layers of an integral body.

11. The wound therapy device of claim 1, further comprising a vacuum chamber filled with a porous material that allows communication of vacuum from the vacuum source.