Wound dressing for combined negative pressure and fluid delivery system

1. A wound dressing device for a combined negative pressure and fluid delivery healing technique, the wound dressing comprising:

a porous sheet ( 101 ) having a top planar surface ( 201 ), a thickness ( 202 ) across which intermediate hollow channels/drills ( 205 ) are present so as to equally distribute negative pressure and fluid flow on the top planar surface, and a bottom uneven surface ( 203 ) having a surface pattern ( 204 ) meant to lie on the surface of a wound, wherein the pattern ( 204 ) of the bottom uneven surface ( 203 ) is a wavy pattern and/or any other regular and/or irregular surface protrusion configured to create intermediate gaps between the wound surface and the bottom surface ( 203 ) of the porous sheet through which fluid can flow over the wound surface;

flexible sheets ( 102 ) having a planar flexible surface comprising a first sheet ( 103 ) and a second sheet ( 104 ) attached to each other at merge areas ( 304 ), the said second sheet ( 104 ) having downward hollow protruded channels ( 301 ), said flexible sheets ( 102 ) having multiple openings ( 305 ) for providing negative pressure or fluid during negative pressure wound therapy and fluid therapy;

such that said downward hollow protruded channels ( 301 ) of the second sheet ( 104 ) having sectional profiles ( 206 ) as that of the hollow channels/drills ( 205 ) of the porous sheet ( 101 ) such that a male-female connection is established between the said protruded channels ( 301 ) and the said hollow channels/drills ( 205 );

said openings ( 305 ) covered with a conduit ( 105 ) allowing the attachment of multichannel tubes ( 106 ) to the wound dressing from the source of negative pressure and source of fluid; and

a side adhesive tapes ( 107 ) meant for sealing the edges of the two flexible sheets ( 102 ) together with the underneath porous sheet ( 101 ) within the peripheral skin area of wound ( 703 ),

wherein the multiple openings ( 305 ) comprises

a first opening ( 306 ) for negative pressure supply adapted to create holes in the one of said merge areas ( 304 ) of said first sheet ( 103 ) and said second sheet ( 104 ) simultaneously isolating the negative pressure supply from the rest of the space ( 307 ) between the first sheet ( 103 ) and second sheet ( 104 ); and

a second opening ( 308 ) for fluid supply positioned on the first sheet ( 103 ) without creating a hole in the second sheet ( 104 ) thereby supplying fluids via second opening ( 308 ) between the first sheet ( 103 ) and second sheet ( 104 ) without affecting the negative pressure wound therapy; such that said fluid spreads over said second sheet and flows through the male-female connection established between the said protruded channels ( 301 ) and the said hollow channels/drills ( 205 ) to the wound site.

2. The wound dressing device as claimed in claim 1 , wherein said conduit ( 105 ) comprises multichannel conduits allowing the attachment of said multichannel tube ( 106 ), or said conduit ( 105 ) comprises separate single channel ( 603 ) conduits allowing the attachment of individual channels ( 604 ) of multichannel tubes ( 106 ).

3. The wound dressing device as claimed in claim 1 , further comprising a wound contact layer ( 108 ) having a hydrophobic or waxy material coating underneath the porous sheet ( 101 ), or the outer surfaces of the porous sheet ( 101 ) are coated with a hydrophobic or waxy material.

4. The wound dressing device as claimed in claim 1 , wherein the positions and alignment of the hollow channels/drill ( 205 ) and the surface patterns ( 204 ) of the bottom uneven surface ( 203 ) of the porous sheet ( 101 ) are physically and geometrically related.

5. The wound dressing device as claimed in claim 1 , wherein the flexible sheets ( 102 ) are transparent.

6. The wound dressing device as claimed in claim 1 , wherein the protruded channels ( 301 ) of the second sheet ( 104 ), defined by walls ( 303 ), are configured to carry fluid ( 302 ) to the wound ( 703 ) without interfering with the negative pressure wound therapy.

7. The wound dressing device as claimed in claim 1 , wherein the attachment of the first sheet ( 103 ) with the second sheer ( 104 ) at merge areas ( 304 ) is such that there is no gap between the two flexible sheets ( 102 ) in the merge area ( 304 ).

8. The wound dressing device as claimed in claim 1 , wherein the attachment of the first sheet ( 103 ) with the second sheet ( 104 ) is by means of adhesive, heat pressing, or another means of industrial bonding.

9. The wound dressing device as claimed in claim 1 , wherein the merged areas ( 304 ) between the two flexible sheets ( 102 ) are configured to allow the flow of fluid radially outward from a central location.

10. The wound dressing device as claimed in claim 1 , wherein either or both of the two flexible sheets ( 102 ) comprise an intermediate uneven surface pattern ( 401 ) to maintain a gap between the first sheet ( 103 ) and the second sheet ( 104 ), such that there is no hindrance to the fluid flow to all the areas within the two flexible sheets ( 102 ).

11. The wound dressing device as claimed in claim 1 , wherein the conduits ( 105 ) are structurally designed to keep isolation between the source of negative pressure and source of fluid at an interface ( 601 ) between conduits ( 105 ) and two flexible sheets ( 102 ) and at another interface ( 602 ) between conduit ( 105 ) and multichannel tubes ( 106 ).

12. The wound dressing device as claimed in claim 1 , wherein the components of the dressing except the side adhesive tapes ( 107 ) is in a merged configuration ( 701 ) wherein

the setup of the two flexible sheets ( 102 ) and the porous sheet ( 101 ) is provided in a merged setup ( 501 ) with factory defined markings ( 502 ) on their surface;

the multichannel tubes ( 106 ) are attached to the conduits ( 105 ), whereas the conduit ( 105 ) is fixed to the openings ( 305 ) of the two flexible sheets ( 102 ).

13. A method of dressing a wound comprising applying the wound dressing device as claimed in claim 12 , the method further comprising:

cutting down the wound dressing device based on the measured size and shape of the wound by a user wherein markings ( 502 ) on the second sheet ( 104 ) guide a user to match the porous sheet ( 101 ) and the two flexible sheets ( 102 ) to the size and shape of the wound ( 703 ), and

markings ( 502 ) on the first sheet ( 103 ) guide the user to cut the first sheet ( 103 ) slightly smaller in area than the second sheet ( 104 ).

14. A method of dressing a wound as claimed in claim 13 , the method further comprising: placing the resultant custom sized cut dressings on the wound ( 703 ); sealing all the edges of the dressing to the peripheral skin area surrounding the wound ( 703 ) by means of adhesive tapes ( 107 ) creating a vacuum seal for negative pressure wound therapy; and simultaneously sealing the edges ( 704 ) of the first sheet ( 103 ) and the second sheet ( 104 ) further ensuring the flow of fluid only through the protruded channels ( 301 ) of the second sheet ( 104 ) to the wound ( 703 ) without any other escape routes, by the user.

15. A method of dressing a wound as claimed in claim 14 , the method further comprising: connecting an end ( 705 ) of the multichannel tubes ( 106 ) to the negative pressure and the fluid source by the user.

16. A method of dressing a wound comprising applying the wound dressing device as claimed in claim 1 , the method further comprising:

placing by the user, the optional liquid and gas permeable wound contact layer ( 108 ) underneath the porous sheet ( 101 ), on top of the wound ( 703 ).

17. The wound dressing device of claim 1 , wherein

the first sheet ( 103 ) and second sheet ( 104 ) are attached to each other at merge areas ( 304 ); and the multiple openings ( 305 ) comprises:

a first opening ( 306 ) for negative pressure positioned on one of the merged areas ( 304 ) of the flexible sheets ( 102 ) such that by means of said first opening negative pressure can be applied directly to the porous sheet ( 101 ); and

a second opening ( 308 ) for fluid supply positioned on the first sheet ( 103 ) without creating a hole in the second sheet ( 104 ) for supply of fluids without affecting the negative pressure wound therapy.