Reduced pressure therapy devices

• US 8,529,532 B2
• Filed: 09/26/2011
• Issued: 09/10/2013
• Est. Priority Date: 03/14/2007
• Status: Active Grant

• Current Assignee: Board of Trustees of the Leland Stanford Junior University (Stanford University)
• Original Assignee: Board of Trustees of the Leland Stanford Junior University (Stanford University)
• Inventors: Pinto, Moshe, Hu, Dean, Fong, Kenton
• Primary Examiner(s): Zalukaeva, Tatyana
• Assistant Examiner(s): Chapman, Ginger T
• Application Number:
  US13/245,746
• Publication Number:
  US 20120016325A1
• Time in Patent Office: 715 Days
• Field of Search: 604/319, 604/304, 604/307, 604/308, 604/313, 604/316, 604/543, 604/321, 604/326, 604/165.04, 604/209, 604/210, 604/211, 604/212, 604/214, 604/221, 604/223, 601/6, 138/30, 138/31
• US Class Current: 604/319
• CPC Class Codes: A61F 13/01029 made of multiple layers
• 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: A61F 13/069 Decubitus ulcer bandages
• CPC Class Codes: A61F 2013/00174 possibility of applying pressure
• CPC Class Codes: A61F 2013/00412 for use with needles, tubes or catheters
• CPC Class Codes: A61F 2013/00519 for treating burn
• CPC Class Codes: A61F 2013/00536 for draining or irrigating wounds
• CPC Class Codes: A61F 2013/0054 for deep wounds
• CPC Class Codes: A61M 1/772 operating alternately
• CPC Class Codes: A61M 1/815 the barrel serving as aspiration container, e.g. in a breast pump
• CPC Class Codes: A61M 1/85 with gas or fluid supply means, e.g. for supplying rinsing fluids or anticoagulants for negative pressure wound therapy A61M1/92, A61M1/94; combined with tracheal tubes A61M16/0463; dental instruments with combined rinsing and aspirating A61C17/0208
• CPC Class Codes: A61M 1/915 Constructional details of the pressure distribution manifold
• CPC Class Codes: A61M 1/92 with liquid supply means
• 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 1/98 Containers specifically adapted for negative pressure wound therapy
• CPC Class Codes: A61M 1/984 portable on the body

Abstract

Described generally herein are tissue therapy devices, which may comprise a sealant layer and a suction apparatus. The sealant layer functions so as to create a sealed enclosure between it and the surface of a patient by forming, preferably, an airtight seal around an area of tissue that requires negative pressure therapy. The tissue therapy device may comprise a suction apparatus. The suction apparatus is typically in fluid communication with the sealant layer and functions so as to reduce the amount of pressure present underneath the sealant layer. The reduced pressure is self-created by the suction apparatus. Together the sealant layer and the suction apparatus preferably create a closed reduced pressure therapy system. Preferably, the pressure under the sealant layer is reduced by expanding the volume of the enclosure space and thereby decreasing the density of the air molecules under the sealant layer.

Claims

1. A reduced pressure therapy system, comprising:

a wound dressing comprising a sealing film, an outlet port, and an adhesive region, wherein the dressing is configured to be affixed around an area of tissue to be treated and create a sealed enclosure;

a suction apparatus configured to self-create a reduced pressure of at least −

50 mm Hg, said suction apparatus comprising a chamber with rigid sides, a slidable sealing member configured to sealably slide along said rigid sides, and a mechanism attached to the slidable sealing member and rotatably engaged to the chamber, the mechanism configured to maintain a position of the slidable sealing member at a plurality of positions within the chamber;

a securing mechanism configured to secure said suction apparatus to a patient independent of the outlet port of the wound dressing.

2. The device of claim 1, further comprising an extension tube configured to attach to the outlet port of the wound dressing and to the suction apparatus.

3. The device of claim 1, further comprising a protective layer configured to be applied to the area of tissue before the application of the wound dressing.

4. The device of claim 1, further comprising a hydrocolloid configured to be applied to the area of tissue.

5. The device of claim 1, further comprising a contact layer configured to be applied to the area of tissue.

6. The device of claim 5, wherein the contact layer is a stacked mesh matrix.

7. The device of claim 1, wherein the chamber is a non-cylindrical chamber.

8. A reduced pressure therapy system,

comprising:

a suction apparatus configured to self-create a reduced pressure of at least −

50 mm Hg, said suction apparatus comprising a chamber with rigid sides, a slidable sealing member configured to sealably slide along said rigid sides, and a mechanism attached to the slidable sealing member and rotatbly engaged to the chamber, the mechanism configured to maintain positioning of the slidable sealing member at a plurality of positions along an entire length of the chamber;

a securing mechanism configured to secure said suction apparatus directly to a patient.

9. The device of claim 8, further comprising a wound dressing comprising a sealing film, an outlet port, and an adhesive region, wherein the dressing is configured to be affixed around an area of tissue to be treated and create a sealed enclosure.

10. The device of claim 9, further comprising an extension tube configured to attach to the outlet port of the wound dressing and to the suction apparatus.