Apparatus for aspirating, irrigating and cleansing wounds

• US 10,278,869 B2
• Filed: 07/11/2017
• Issued: 05/07/2019
• Est. Priority Date: 10/28/2002
• Status: Expired due to Term

• Current Assignee: Smith & Nephew PLC
• Original Assignee: Smith & Nephew PLC
• Inventors: Blott, Patrick Lewis, Greener, Bryan, Hartwell, Edward Yerbury, Walker, Tina Michelle, Nicolini, Derek, Lee-Webb, Julian
• Primary Examiner(s): Kidwell, Michele M
• Application Number:
  US15/647,111
• Publication Number:
  US 20170367894A1
• Time in Patent Office: 665 Days
• Field of Search: 604 19, 604289-290, 604304-308, 604543, 604317, 604327, 604319-323
• CPC Class Codes: A61F 13/00063 comprising medicaments or additives, e.g. odor control, PH control, debriding, antimicrobic drug delivery dressings A61K9/70; chemical aspect of the additives A61L15/00
• 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 13/512 characterised by its apertures, e.g. perforations
• CPC Class Codes: A61F 2013/00174 possibility of applying pressure
• CPC Class Codes: A61F 2013/00221 biodegradable, non-irritating
• CPC Class Codes: A61F 2013/00536 for draining or irrigating wounds
• CPC Class Codes: A61F 2013/0054 for deep wounds
• CPC Class Codes: A61F 2013/00927 with biological activity, e.g. enzymes for debriding wounds or others, collagen or growth factors
• CPC Class Codes: A61M 1/74 Suction control underwater drainage A61M1/61
• CPC Class Codes: A61M 1/77 Suction-irrigation systems aspiration tips supplying fluids A61M1/85; specific for negative pressure wound therapy A61M1/92; combined with tracheal tubes A61M16/0463
• 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 1/916 specially adapted for deep wounds
• CPC Class Codes: A61M 1/92 with liquid supply means
• CPC Class Codes: A61M 1/96 Suction control thereof
• 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
• CPC Class Codes: A61M 3/0208 before use
• CPC Class Codes: A61M 3/0212 after use
• CPC Class Codes: A61M 3/0216 Pressure
• CPC Class Codes: A61M 3/022 Volume; Flow rate
• CPC Class Codes: A61M 3/0229 : Devices operating in a closed circuit, i.e. recycling the irrigating fluid

Abstract

An apparatus for cleansing wounds in which irrigant fluid from a reservoir connected to a conformable wound dressing and wound exudate from the dressing are recirculated by a device for moving fluid through a flow path which passes through the dressing and a means for fluid cleansing and back to the dressing. The cleansing means (which may be a single-phase, e.g. microfiltration, system or a two-phase, e.g. dialytic system) removes materials deleterious to wound healing, and the cleansed fluid, still containing materials that are beneficial in promoting wound healing, is returned to the wound bed. The dressing and a method of treatment using the apparatus.

Claims

1. A wound treatment apparatus, comprising:

a wound dressing configured to be placed over a wound, the wound dressing comprising;

a backing layer comprising a switchable material that increases in moisture vapor permeability when in contact with liquid; and

a filler under the backing layer, the filler being integrally provided with the backing layer;

a source of negative pressure configured to apply negative pressure to the wound dressing; and

a fluid offtake conduit configured to provide fluid communication between the source of negative pressure and the wound dressing;

wherein the switchable material increases in moisture vapor permeability and allows evaporation of moisture vapor when negative pressure is applied under the backing layer to draw wound exudate into the wound dressing and into contact with the switchable material.

2. The apparatus of claim 1, further comprising a membrane layer on a wound-facing side of the filler, the membrane layer configured to contact the wound.

3. The apparatus of claim 2, wherein the membrane layer comprises a plurality of apertures.

4. The apparatus of claim 1, wherein the filler comprises foam.

5. The apparatus of claim 4, wherein the foam is attached to the backing layer.

6. The apparatus of claim 1, wherein the filler comprises a conformable body comprising a polymer film, sheet or membrane that at least partly surrounds a solid integer.

7. The apparatus of claim 1, wherein the filler comprises a hydrophilic material.

8. The apparatus of claim 1, wherein the filler comprises a cellulosic gel.

9. A wound treatment apparatus comprising:

a wound dressing configured to be placed over a wound, the wound dressing comprising;

a backing layer comprising a switchable material that increases in moisture vapor permeability when in contact with liquid;

a filler under the backing layer, the filler being integrally provided with the backing layer; and

a sheet under the filler, wherein a periphery of the sheet extends beyond and surrounds the filler; and

a source of negative pressure configured to apply negative pressure to the wound dressing;

wherein the switchable material increases in moisture vapor permeability and allows evaporation of moisture vapor when negative pressure is applied under the backing layer to draw wound exudate into the wound dressing and into contact with the switchable material.

10. The apparatus of claim 9, wherein the filler comprises foam.

11. The apparatus of claim 10, wherein the foam is attached to the backing layer.

12. The apparatus of claim 9, wherein the filler comprises a conformable body comprising a polymer film, sheet or membrane that at least partly surrounds a solid integer.

13. The apparatus of claim 9, wherein the filler comprises a hydrophilic material.

14. The apparatus of claim 9, wherein the filler comprises a cellulosic gel.