AND FLUID DELIVERY SYSTEM TECHNICAL FIELD OF THE INVENTION

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[001] The present subject matter described herein, in general, relates to healing of wounds and wound-treatment therapies, and more particularly, to a dressing for wound healing configured for equal distribution of negative pressure and fluid delivery at wound site to enhance wider range of bio mechanism favourable for wound healing.

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BACKGROUND OF THE INVENTION

[002] Wound healing is a natural biological process which occurs in four phases starting with haemostasis followed by inflammatory phase and proliferative phase. It then ¾ finishes with remodelling phase. Common chronic types of wounds are venous leg ulcers, ischemic wounds, diabetic foot ulcers, and pressure wounds and acute wounds are traumatic wounds, post-surgical wounds and burns.

[003] A wound is classified as a non-healing wound if it does not heal in an , orderly and timely manner. These wounds usually do not close without interventions, and are sometimes resistant to healing interventions. Many local and systemic factors may interfere in one or more of phases of healing process and make wounds difficult to heal. Some common features shared by each of these wounds i ncl ude prolonged inflammation, excessive discharge, persistent infections, and formation of drug- resistant microbial bio i¾ films. These non-healing wounds can be exhausting for the affected individual and place a massive financial burden on healthcare systems.

[004] Wounds affect approximately 1% of the population worldwide. In the

United States, chronic wounds affect around 6.5 million patients. A conservative estimate t¾a of the staggering cost of caring for these wounds exceeds $50 billion per year. The prevalence of chronic wounds in India is reported to be 4.5/1000 population and acute wounds to be 10.5/1000 population. Complications to non- heali ng wounds are vast including poor quality of life, severe pain, septicaemia, prolonged hospitalization, and in most cases amputations.

¾ [005] The care of these wounds has become its own specialty, with providers often usi ng advanced therapies, i ncluding but not limited to growth factors, extracellular matrices, bioengineered skin, oxygen therapy, and negative pressure wound therapy (NPWT). Negative pressure wound therapy has been found useful in treating exudating wounds. But there are limitations of this technology which restricts its use in various 3a clinical conditions. It requires frequent change of dressing in case of contaminated wounds because negative pressure wound therapy does not control microbial growth per se. However, few literature and prior art propose use of NPWT systems with Fluid therapies like use of Antibiotics, Sali ne water, Oxygenation to take care of microbial growth at the wound site.

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[006] For various kinds of wound care systems reference is made to

US20130204210, US20100121287, US20150320917 and US20160166781, which discloses few embodiments on the combinations of negative pressure fluid therapy and fluid delivery. However, there are gaps at various aspects of the functional architecture , and design such as poor uniform distribution of negative pressure and poor uniform fluid delivery, not being a solo integrated wound care device, lack of smart control logic to use combination of therapies in an optimized way.

[007] The dual action wound healing device is described in US8088113B2 i¾ where a portable, self-contained device is used for the topical application of oxygen and the removal of wound exudates to promote the healing of skin wounds. However, the working principle of the device cannot provide oxygen and negative pressure simultaneously. Also, there is no provision for the user to set specific negative pressure and duty cycle. [008] Reference is also made to US 20100106117 A1 which describes about a wound treatment apparatus which comprises of a vacuum therapy along with a wound dressing member that only allows for irrigation. The wound dressing member claims that the presence of open spaces in the design allows for a generally uniformly distributed ¾ vacuum therapy to draw exudates from the wound. However, the system works only with liquid mainly for the purpose of irrigation. It is unable to deliver other fluids such as oxygen. The application procedure for the bandage also requires multiple steps

[009] Reference is made to US 9050210, which describes a system for applyinga reduced pressure along with a porous pad along with a drape positionable over the porous pad to seal. The system focuses on the intricacies of the porous pad and the possi ble arrangement of it However, the system is not suited for delivery of any fluids including oxygen. As such, the system is unable to carry out dual therapy with negative pressure and fl uid delivery.

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[0010] Reference is also made to US 9114237, which provides systems and methods for delivery of fluid to wound therapy dressing wherein, a pressure source provides negative pressure to a wound dressing and a positive pressure to an actuator that expels f I ui d from a f I ui d reservoi r.

[0011] Further, Reference is also made to US 7534240 B1, which relates to a method and apparatus for the introduction to a wound under negative pressure therapy for a wound healing agent which generally comprises a foam pad for insertion into a wound site and a wound drape for seal i ng end osure of the foam pad at the wound site.

[0012] Reference is made to WO2014140578 that relates to the treatment of wound with negative pressure, but in particular it relates to wound closure. It makes use of a wound filing and is particularly useful for large wounds. However, it does not relate to the isolation of negative pressure and positive pressure (fluid) at the wound site. [0013] Further, there are already some existing wound treating systems available in the art. This is ACTI V .A.C Negative Pressure Wound Therapy (NPWT) System which is a portable system designed for ambulatory patients. Designed to help patients resume their activities of dai ly living while still receiving the benefits of V.A.C. ÷ Therapy.

[0014] There is PICO by Smith & Nephew, global product which is a unique way of treating patients who would benefit from the application of NPWT. PICO is a revolutionary single use, canister free system, can save money compared to advance wound dressings by extending the interval between changes.

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[0015] Further, there is also FDA cleared extriCA R E÷ 2400 N PWT System which works to remove wound exudates, infectious material, and tissue debris from the wound bed and bring blood to the wound, which promotes faster healing. There is also Invia Liberty (of Medela, USA) which is a reusable NPWT system that can be used to treat a variety of wound types. It offers clinical flexibility with a range of pressure settings and therapy modes, while promoting patient mobility due to pump s compact size and lightweight design.

[0016] The Avance÷ Solo is a small and lightweight NPWT pump that , maximizes patient freedom and mobility. Avance Solo al lows for quick and easy discharge of patients from hospital while also reducing the challenges of logistics and administration for the caregiver. The VTG 3000, iVAC is portable system with a weight of about 600gms. The system delivers continuous, variable and intermittent therapy with safety parameters for leakage, blockage, canister full, system tilt and inactive conditions.

[0017] The Smart NPWT (of Medical Development & E ngineering, Pune) is a wound care modality used in modern healing process It is a treatment using sub- atmospheric pressure to increase blood flow remove bacteria and increase growth of granulation tissue in the wound. [0018] WOU NDEX (of The Wedelia Surgical, Bangalore, India) is a C E certified

NPWT U nit with unique features l ike impact pressure mode, GSM module, intermittent pressure mode, leakage caution systern light caution and nurse call system which can be used on various kind of wounds.

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[0019] Most of the times, negative pressure wound therapy and fluid delivery therapies are used as separate treatment modes. Although there are prior arts available which disclose use of Negative pressure and oxygen together yet those systems are not efficient in lot of aspects. One of the limitations with existing prior arts is isolating

3a negative pressure and positive pressure (fluid) at the wound site so that both the therapies can be provided at the wound site independently as well as simultaneously without i nterferi ng with each other. Y et another disadvantage with existi ng dual therapy dressi ngs is difficulty in optimizing even distribution of negative pressure and oxygen at the wound site. Again, no such dual therapy dressi ng exists which can be used for treating a wide

¾ range of wounds that may i ncl ude but not I i mited to i nfected wounds, exudati ng wounds, non-exudating wounds and the like. Another important factors to take care of is that existing dressings are made in various size and shape to accommodate various types of wounds which add to manufacturing and production cost Further, most of the prior arts available for dual therapy dressing need several systematic procedural steps for , appl ication at wound site. This needs training for the clinician which is another problem from ease of use perspective.

[0020] Therefore, there is a dire need to provide an effective wound dressing to enhance wider range of bio mechanism favorable for would healing and which does not i¾ suffer the disadvantages associated with a conventional wound healing techniques and wound N PWT system

SU M MA RY O F T H E INV E NT IO N

[0021] The fol lowing disclosure presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. This summary is †3a not an extensive overview of the present invention. It is not intended to identify the key/critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some concept of the invention in a simplified form as a prel ude to a more detailed description of the invention presented later.

[0022] A n obj ect of the present i nventi on i s to provi de wound dressi ng for wound ¾ healing configured for equal distribution of negative pressure and fluid delivery at wound site to enhance wider range of bio mechanism favourable for wound healing.

[0023] Another object of the present invention is to provide a wound dressing which promotes wound healing by a multi -therapeutic action which comprise of means of 3a removing exudates, reducing inflammation, enhancing perfusion and controlling microbial growth.

[0024] Y et another object of the present invention is to provide a wound dressing with a unique arrangement of dressing components that can ensure one step procedure for ¾ wound site application and equal distribution of negative pressure and fluid delivery at the wound site covering the whole area.

[0025] Another object of the present invention is to provide a wound dressing with a provision for controlled delivery of negative pressure and fluid delivery , independently as well as simultaneously to the wound site without interfering with each other.

[0026] Y et another obj ect of the present i nventi on i s to provi de a wound dressi ng that can be configured easily to accommodate wound of any size and shape.

[0027] Sti 11 another obj ect of the present i nventi on i ncl udes a si mpl e desi gn of the wound dressing that can easily be manufactured thus making it cost effective and affordable.

†3a [0028] The wound care dressing is configured to provide therapeutic action by enhancing wider range of bio mechanism favorable for wound heali ng. The dressing comprises: at least one porous sheet; at least two flexible sheets having a first sheet and a second sheet attached to each other; a multi-channel conduit or a plurality of si ngle channel conduits; at least one multi-channel tubes; side adhesive tapes and an optional wound contact layer. The principle, design and mechanism of this dressing can be ¾ adapted for any kind of wound at various anatomical sites of human body that may include but not limited to post-surgical wounds of amputated limbs, abdominal wounds, wounds at neck and other bony areas and the I i ke.

[0029] B ri ef ly, vari ous aspects of the subj ect matter descri bed herei n are di rected

3a towards a wound heali ng and more particularly to wound healing dressing configured to enhance wi der range of bi o mechanism favourabl e for wound heal i ng.

[0030] Other aspects, advantages, and salient features of the invention will become apparent to those ski 11 ed i n the art from the f ol I owi ng detai I ed descri pti on, whi ch, ¾ taken i n conj uncti on with the annexed drawi ngs, di scl oses exempl ary embodi ments of the invention.

BRIE F DE SC RI PTION O F T H E AC CO M PA NY ING DRAWINGS , [0031] The above and other aspects, features, and advantages of certain exemplary embodiments of the present invention will be more apparent from the following description taken in conjunction with the accompanying drawings in which:

[0032] Fig. 1 (a) and 1(b) show the various components of the basic wound i¾ dressi ng i n accordance with an embodi ment of the present i nventi on.

[0033] Fig. 2(a) illustrates a porous sheet in accordance with one embodiment of the present invention.

[0034] Fig. 2(b) ill ustrates secti onal prof i I e of hoi I ow channel s/dri 11 s of the porous

†3a sheet i n accordance wi th one embodi ment of the present i nventi on. [0035] Fig. 2 (c) illustrates various possible arrangements of hollow channels withi n the porous sheet i n accordance with one embodi ment of the present i nventi on.

[0036] Fig. 3(a), Fig. 3(b)and Fig. 3(c) illustrate assembly of the various components of the basic wound dressing in accordance with an embodiment of the ¾ present invention.

[0037] Fig. 3(d), 3(e) and 3(f) illustrates an embodiment of opening channels of the dressing for negative pressure and fluid delivery.

[0038] Fig. 4(a) and Fig. 4(b) illustrate the application of the dressing as well as isolation between negative pressure and fl uid source within the dressing, in accordance 3a wi th one embodi ment of the i nventi on.

[0039] Fig. 5 (a), Fig. 5(b), Fig. 5(c) and Fig. 5(d) illustrate various embodiments to make the application of dressing a one- step procedure.

[0040] Fig. 6(a), Fig. 6(b), Fig. 6(c), Fig. 6 (d) illustrated various embodiments of the multichannel conduit and multichannel tubings.

¾ [0041] Fig. 7(a), Fig. 7(b), 7(c) illustrates the mechanism for applying the dressing to fit wound of any shape, in accordance with one embodiment of the present invention.

[0042] Fig. 8 illustrates application of wound contact layer at the wound site, in accordance with one embodi ment of the present i nventi on.

, [0043] Fig. 9 illustrates an embodiment of the present invention for amputed wound site

[0044] Fig. 10 illustrates an embodiment of the present invention for perinatal wounds i¾ [0045] Persons skilled in the art will appreciate that elements in the figures are illustrated for simplicity and clarity and may have not been drawn to scale. For example, the dimensions of some of the elements in the figure may be exaggerated relative to other elements to help to improve understanding of various exemplary embodiments of the present disclosure. T hroughout the drawings, it should be noted that li ke reference

†3a numbers are used to depi ct the same or si mi I ar el ements, features, and structures. DE TAIL E D DE SC RIPTIO N O F T H E PR E SE NT INV E NT IO N

[0046] The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary embodi ments of the ¾ invention. It i ncludes various specific details to assist in that understanding but these are to be regarded as merely exemplary.

[0047] Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herei n can be made without 3a departing from the scope of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.

[0048] In one embodiment, a multi-action wound dressing is provided for wound healing by a mu I ti -therapeutic action. In the present invention fluid is defined as any ¾ matter that flows and which includes both gaseous and liquid state matters. This may include but not limited to water, saline water, oil, oxygen, ai r, liquid, medicine and the like.

[0049] The wound dressing will be adapted for multiple underlying mechanisms , of wound healing process. In the system all the components may be integrated to provide various therapeutic actions that may include but not limited to, exudates removal, reducing inflammation, enhancing cell proliferation and control ling microbial growth. The various processes associated with the wound healing such as controlled delivery of negative pressure and fluid delivery may be occurring simultaneously or independently at i¾ the wound site without interfering each other. The arrangements of components in a manner can make it simple one step procedure for wound site application. The design arrangement of the wound dressing is in a manner to ensure equal distribution of negative pressure and fluid delivery at wound site across the whole area. The unique arrangement of components of wound dressing make the wound dressing system better designed and †3a flexible enough to be used for wounds of different size and shapes. [0050] In one embodiment, as shown in Fig. 1(a) and 1(b), the basic overview of an embodi ment of the dressing comprises: a porous sheet (101); two flexible sheets (102) having a first sheet (103) and a second sheet (104) attached to each other; multichannel conduits (105) or a plurality of single channel conduits; multichannel tubes (106), side ¾ adhesive tapes (107) and an optional wound contact layer (108)

[0051] In one embodiment, as shown in Fig. 2(a), wherein the porous sheet (101) may include a top planar surface (201), thickness (202) across which intermediate hollow channels /dri lls (205) are present so as to equally distribute negative pressure and fluid 3a flow on the surface and a bottom uneven surface (203). The bottom uneven surface (203) lies on the surface of the wound and may have surface patterns (204). The pattern (204) may be wavy patterns and/or any other regular and/or irregular surface protrusion that allow intermediate gaps between wound surface and the bottom surface (203) of the porous sheet through which fluid can flow over the wound surface.

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[0052] In one embodiment the porous sheet (101) also include an intermediate hollow channels /drills (205) across the thickness (202) of the porous sheet (101) that creates an opening at the top planar surface (201) and the bottom uneven surface (203) of the porous sheet (101). The sectional profile (206) of hollow channels/drills (205) as , shown in fig 2(b) can be of any geometrical shape that may include but not limited to circular, triangular or some random irregular shape.

[0053] In one embodiment there may be various physical and geometrical relationships between the positions and al ignment of the hollow channels/drill (205) and i¾ the surface patterns (204) of the bottom uneven surface (203) of the porous sheet (101 ) as shown in Fig. 2c.

[0054] In one embodiment, the two flexible sheets (102) comprise of a first sheet

(103) and a second sheet (104) as shown in Fig. 1a and Fig. 1 b. The two flexible sheets †3a (102) can be transparent as shown in Fig. 3a. In the embodiment the second sheet (104) may have a planar flexible surface having downward hollow protruded channels (301) that has sectional profiles (206) as that of hollow channels/drills (205) of the porous sheet (101). T he protruded channels (301) are distributed on the second sheet (104) in such a way that those can fit the hollow channels/drills (205) of the porous sheet (101) as male- female connection as shown in Fig. 3b. In such a configuration the protruded channels ¾ (301) of the second sheet (104) carry fluid (302) to the wound site without interfering with the negative pressure wound therapy. T he walls (303) of the protruded channels (301) act as barrier for liquid and gas.

[0055] In one embodiment the first sheet (103) may include a planar flexi ble

3a surface attached to the second sheet ( 104) at a merged area (304) i n such a way that there is no gap between the two flexible sheets (102) in that particular area as shown in Fig. 3c. In another embodiment as shown in Fig. 3d there can be two or more of such areas where the first sheet (103) and second sheet (104) are attached in si milar way. The process for attaching the two flexible sheets (102) in such fixed size merged area (304) can be use of ¾ adhesive, heat pressi ng, or any other means of Industrial bondi ng.

[0056] In one embodiment, the two flexible sheets (102) may further include openings (305) for providing negative pressure or fluid during therapies like negative pressure wound therapy and fluid therapy respectively. In one embodiment as shown in , Fig. 3(c), 3(d) and 3(e), a first opening (306) for negative pressure may be positioned on the merged area(s) (304) of the two flexible sheets (102) so that via the first opening negative pressure can be applied directly to the porous sheet (101) level. This first opening at the merged areas (304) create holes in both first sheet (103) and second sheet (104) simultaneously and isolates the negative pressure supply from rest of the space i¾ (307) between the first sheet (103) and second sheet (104). Another second opening (308) for fluid supply is (are) positioned on the first sheet (103) without creating hole in the second sheet (104). The fluids can be supplied via second opening (308) between the first sheet (103) and second sheet (104) without affecti ng the negative pressure wound therapy. [0057] In an alternate embodiment referring to Fig. 3 (f), the merged areas (304) between the two flexible sheets (102) can be configured in a particular way thereby allowing the flow of fluid radially outward from the central location. This kind of configuration allows the clinician to cut the dressing to any shape yet achievi ng uniform ¾ distri buti on of f I ui d across the dressi ng.

[0058] In one embodiment during clinical setting as shown in Fig. 3(e), side adhesive tapes (107) may be used to seal the edges of the two flexible sheets (102) together with the underneath porous sheet (101) withi n the peripheral skin area of the 3a wound site.

[0059] In an embodiment as shown in Fig. 4(a), the area of the first sheet (103) may be kept slightly smaller than that of the second sheet (104) so that during sealing with the side adhesive tapes (107), the edges of first sheet (103) will get sealed with the ¾ second sheet (104) while sealing the two flexible sheets (102) with the skin surface. Due to this arrangement the supplied fluid through the second opening (308) remain within the two flexible sheets (102) and eventually flow through the protruded channels (301) of the second sheet (104). In a similar configuration as shown in Fig. 3e the supplied fluid will reach the wound site via the protruded channels (301 ).

[0060] In another embodiment, as shown in Fig. 4(b), either or both of the two flexible sheets (102) can further have an intermediate uneven surface patterns (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).

[0061] In one embodiment, in order to make this configuration easy, in a basic setup the two flexible sheets (102) and the porous sheet (101) may be provided in a merged setup (501) as shown in Fig. 5(a). The two flexible sheets (102) may include factory defined markings (502) on their surfaces as shown in Fig. 5a and Fig. 5b to guide †3a the clinical practitioner to cut the two flexible sheets (102) along with the underneath porous sheet (101) at equal size as the wound area and at a right configuration. Further, as shown in Fig 5c the same dressing can be cut down to apply on wound (503) of any size and shape. The markings (502) on the second sheet (104) may allow the clinical practitioner to cut the porous sheet (101) along with the second sheet (104). While the markings (502) on the fi rst sheet (103) guide the clinical practitioner to cut the first sheet ¾ (103) in a smaller area than the second sheet (104), thus ensuring an airtight sealing between the first sheet (103) and second sheet (104) while sealing the two flexible sheets (102) together with the skin surface. In an alternative embodiment, as shown in Fig. 5d, the two flexible sheets (102) may composed of materials that can be easily teared along with the foam, by the hands of the cli nician.

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[0062] In one embodiment, as shown i n Fig. 6(a), the openings (305) which include first opening (306) and second opening (308) may be covered with a multichannel conduit (105) that can allow attachment of multichannel tubes (106) to the dressing from the source of negative pressure and source of fluid. As shown in Fig. 6(b) , the

¾ multichannel conduits (105) may be structurally designed to keep isolation between the source of negative pressure and source of fluid at an interface one (601) between multichannel conduits (105) and two flexible sheets (102) as well as at an interface (602) between multichannel conduit (105) and multichannel tubes(106) .Variations of multichannel conduits (105) and multichannel tubes (106) are further shown in Fig. 6 (b) , and 6(c) respectively.

[0063] In an alternate embodiment referring to Fig. 6(d), the openings (305) that includes first opening (306) and second opening (308) may be covered with a separate single channel conduits (603), which allows attachment of individual channels (604) of i¾ the multichannel tubes (106) to the dressing from the source of negative pressure and fluid. This provides a simpler approach without the need of designing a sophisticated multichannel conduit (105) as shown in Fig. 6(a).

[0064] In one embodiment, in a factory setti ng in which the dressing comes in a t¾a configuration where most of the components of the dressing except the side adhesive tapes (107) may come in a merged configuration (701) as shown in Fig. 7(a). The multichannel tubes (106) may be attached to the conduits (105), whereas the conduit (105) may be fixed to the openings (305) of the two flexible sheets (102). T he porous sheet (101) underneath may be merged with the two flexible sheets (102) in such a way that the protruded channels (301 ) are distri buted on the second sheet (104) so as to fit the ¾ hollow channels/drills (205) of the porous sheet (101) as a male-female connection.

[0065] In one embodiment a standard wound care cli nical case scenario is shown

Fig. 7(b), the clinician may first check the size and shape of the wound. Then the wound dressing in the merged configuration as shown in fig 7 (a) may be cut down to match the wound site (703). The markings (502) on the second sheet (104) guide the clinician to

3a match the porous sheet (101), along with the two flexible sheets (102) to the size and shape of the wound (703). The markings (502) on the first sheet (103) guide the clinician to cut the first sheet (103) slightly smaller in area than the second sheet (104). Further, as shown in Fig. 7(c) the clinician places the resultant custom sized dressing on the wound site (703) and uses the adhesive tapes (107) to seal all the edges of the dressing to the

¾ peripheral skin area surrounding the wound site (703) to create a vacuum seal for the negative pressure wound therapy. Simultaneously, sealing occurs between the edges (704) of the first sheet (103) and the second sheet (104) during this process further ensuring the flow of fluid only through the protruded channels (301) of the second sheet (104) to the wound site (703) without any other possible escape routes. T he clinician then connects , the other end (705) of the multichannel tubes (106) to the negative pressure and the fluid source.

[0066] In one embodiment referring to Fig. 8, an optional liquid and gas permeable wound contact layer (108) can be used underneath the porous sheet (101), on i¾ top of the wound site (703), to prevent pain during dressing removal at the end of negative pressure wound therapy. The wound contact layer (108) may include special hydro phobic or waxy material coating such as paraffin, to prevent firm adherence of the porous sheet (101) to the wound site due to prolonged negative pressure wound therapy. In an alternative embodiment similar results can be achieved by using such special

†3a hydrophobic or waxy material such as paraffin, to coat the outer surfaces of the porous sheet (101) without the need of usi ng the wound contact layer (108) [0067] The principle, design and the mechanism of the wound dressing system can be adapted for any kind of wounds at various anatomical site of human body that may include but not limited to post-surgical wounds of amputated limbs, abdominal wounds, wounds at neck and other bony areas. Figs. 9 and 10 which illustrates two embodiments ¾ of dressi ng for such ki nd of wounds.

[0068] Some of the noteworthy features of the present invention are mentioned below:

1. The invention comprises a wound dressing that can be used for any kind of 3a wound that may include but not limited to infected wound, exudating wound, non-exudating wound and the like. The dressing can be used for therapeutic combination of negative pressure and fluid delivery that makes the solution usable for treatment of more than one type of wound by taki ng care of various underlying mechanisms which contribute to wound healing process. The multi ¾ therapeutic action can comprise of means of removing exudate, reducing inflammation, enhancing perfusion and controlling microbial growth.

2. It is a simple yet unique approach to isolate negative pressure and positive pressure (fluid) at the wound site, so that negative pressure and positive pressure (fluid) can be provided at the wound site independently as well as simultaneously without interfering each other. This can be done by i ntroduci ng the concept of havi ng a merged area and unmerged area between the two flexible sheets as well as concept of hollow protrusions in the second sheet that fits the porous sheet above the wound site which are liquid and gas impermeable.

3. The dressing is engineered at the structural level to optimize even distribution of Negative pressure and fluid. This is done by following means:

a) Channels for both the therapies evenly distributed over the dressing sheets. b) Structural modification to conventional porous sheet to get even distribution of both the therapies.

c) Structural entities between the two sheets allow uniform distribution of fluid within the two flexible sheets to ensure further even distribution

¾ of fluid at the wound site through fluid carryi ng channels.

4. The present invention provides a single dressing that can be configured to accommodate wound of any size and shape. This can be achieved by uniform distribution of channels for both the therapies over the dressing, centrally

3a placed conduit markings on the surface of the dressing make the dressing applicable to wound of any size and shape.

5. The present invention reduces complexities of delivering the two therapies by using a si mplified design. Structural design and arrangement of various

¾ components of the dressing make it compact enough which can be packed and distributed as factory configuration along with side tapes. So whole process of dressing application can be reduced to one step procedure. The simple design of the dressing can be easily manufactured with conventional techniques thus savi ng cost to make it affordable.

[0069] Some of the non- limiting advantages of the present i nvention over the prior art are mentioned below:

1. The existing N PWT dressings are not used for long duration on infected wounds. The wound dressing system of the present invention use fluid delivery i¾ which provides antimicrobial property to the dressing and can be used for longer duration even for i nfected wounds.

2. In current practice, the dressing for NPWT therapy is a multi-step time consumi ng process. The dressing of the present invention is comparatively a simpler which requires less number of application steps thereby making it easy to

†3a use and savi ng ti me effort of the health care provi der. 3. The wound dressing of the present invention is better designed than existing dressings and allows for equal distribution of pressure and fluid thus resulti ng i n uniform heal i ng of the wound i n I esser ti me.

4. The dressing of the present invention can be used for various kinds of wounds.

5. The simple design and flexibility of the dressing can be easily manufactured with conventional techniques thus saving cost to make it affordable and is usable for wounds of any shape and size.

6. A single dressi ng that can be configured easily to accommodate wound of any shape and size, which is achieved by uniform distribution of channels for both the therapies over the dressing, centrally placed conduits, markings on the surface that can accommodate wound of any shape and size.

7. The dressing can be arranged in a compact form which can be packed and distri buted as factory configuration along with side tapes.

8. The whole process of dressing application can be reduced to a one step procedure

[0070] Although a wound dressing for negative pressure wound treatment have been described in language specific to structural features and/or methods, it is to be understood that the embodiments disclosed in the above section are not necessarily limited to the specific features or methods or devices described herein. Rather, the specific features are disclosed as examples of implementations of the wound dressing.