WO2009068713A1

WO2009068713A1 - Bandage which can be used as a temporary cover for treating wounds

Info

Publication number: WO2009068713A1
Application number: PCT/ES2008/000742
Authority: WO
Inventors: Mariano Segundo Jimenez; Alberto Luis Moguilliansky; Jorge Eduardo Brignone; Héctor Damián SANCHEZ
Original assignee: Mariano Segundo Jimenez; Alberto Luis Moguilliansky; Jorge Eduardo Brignone; Sanchez Hector Damian
Priority date: 2007-11-27
Filing date: 2008-11-27
Publication date: 2009-06-04
Also published as: AR063987A1

Abstract

The invention relates to a bandage (1) which can be used as a temporary cover for treating wounds, characterised in that it includes: a layer (4) which is in contact with the affected area, consisting of a fabric comprising modified polyester fibres in the cross-section thereof and an open-work weave fabric; a set of inner layers, including at least three stacked layers (5, 5', 5') made from a low-fibre-density geotextile or non-woven fabric formed by polyester fibres and cellulose fibres; and an outer layer (9) made from a polyester microfibre twill fabric. The invention also relates to a method for producing a bandage (1) which can be used as a temporary cover for treating wounds in accordance with any of claims 1 to 3, characterised in that it comprises the following steps: (a) placing a layer (4) of polyester fabric on a planar surface; (b) stacking the inner layers (5, 5', 5') which are made from a low-fibre-density geotextile or non-woven fabric formed by polyester fibres and cellulose fibres; (c) vertically cutting or perforating all of the layers formed in step (b); (d) positioning the outer layer (9) which is made from a polyester microfibre twill fabric; and (e) cutting all of the layers obtained in (d) in order to produce individual bandages.

Description

APPOSITION USED AS A TEMPORARY COVERAGE FOR WOUND TREATMENT

DESCRIPTIVE MEMORY Field of the Invention

The present invention relates to the field of medicinal products used for the treatment of wounds. Preferably, it refers to the field of dressings, more preferably those dressings made with smart fabrics to be used as temporary coverings in the treatment of skin wounds. Background of the Invention

Various types of dressings are known in the art that have been developed as cutaneous wound coverings, from simple gauze and cotton dressings, through those with cotton and cellulose, to those containing hydrocolloids to favor cell migration. In general, known dressings are limited to absorbing and retaining liquids providing protection of the external environment, without taking into account other characteristics designed to control numerous variables to be taken into account in tissue repair processes.

Cutaneous wounds benefit in general with local occlusive treatments, especially extended surface lesions such as burns, ulcers of varied etiology and traumatic wounds in general.

In this type of wounds, the currently used resources include cotton gauze alone or impregnated with solid petroleum jelly to be used as the first coverage of a wound that previously received a suitable toilet and, in some cases, a local antibiotic. To this must be added as a second cover a dressing of gauze or cellulose and cotton, or several layers of sterile gauze in order to retain secretions, and finally the fastening of all the preceding with several turns of cotton bandages and adhesive fabric that confer to the patient the appearance of a bandaged "mummy".

The disadvantages of this type of skin coverings and bandages are multiple since they tend to immobilize the parts compromised by the high volume of material used, they lack an adequate interface in contact with

The surface injured by which the wounds tend to dry out or macerate, and are unable to fluidly exchange exudates and waste substances.

Given the need to have a dressing that allows a good mobility of the patient, understand a dynamic interface in contact with the wound allowing a favorable exchange of exudates and waste substances, and ensure excellent protection of the affected area from the bacteriological point of view and adequate ventilation to allow an effective restoration of the tissues, the present invention comes to solve the problems set forth by the known and described dressings in the state of the art by providing patients with a better recovery of their injuries, and quality of life, during the time the process takes. Therefore, in the present invention a temporary coverage is proposed for the treatment of wounds that unexpectedly comes to solve the problems of the state of the art. Preferably, dressings made with smart fabrics are proposed to be used as temporary coverage in the treatment of skin wounds. Summary of the invention

The present invention relates to a new type of dressing usable in the treatment of skin wounds with an unexpected result, which comprises the elaboration of a device for which "intelligent" fabrics are used capable of responding adequately to a greater number of variables involved in the processes of tissue repair, and on whose proper attention depends the course of the processes, the repair time and the quality of the same, as well as the tenor of the foreseeable sequels. Brief Description of the Figures

Figure 1 shows a detail of a preferred embodiment of the dressing of the present invention, showing the different superimposed layers that constitute it.

Figure 2 shows the ligament of a preferred embodiment of the fabric that forms the first layer of the dressing according to the present invention that is arranged in contact with the bed of wounds to heal.

Figure 3 shows the structure (sheave loom) spiked 2 x 2 in a preferred embodiment of an intelligent type fabric that forms the outer layer that allows the vapors to pass, but retaining moisture and exudate liquids during the processes of wound healing.

Figures 4 A, 4 B and 4 C show the evolution of a 38-year-old patient with a deep ulcer produced by electricity in the left gluteal region with exposure of subcutaneous cellular tissue during which treatment a preferred form of the bets according to Ia was applied present invention as coverage of the wound.

Figures 5 A, 5 B and 5 C show the evolution of a 48-year-old patient with type B (deep) burn by fire, located in the upper right limb, during whose treatment the occlusion was performed with a preferred embodiment of the dressings according to the present invention. Figures 6 A, 6 B and 6 C show the evolution of a 29-year-old patient with deep burns type B (third grade) in both buttocks by fire, - A - during which treatment a preferred form of the dressing according to the present invention was used. Figure 6 A shows the right gluteus and Figure 6 B shows the intense work of the dressing according to the invention in the absorption of secretions and scattered tissue. Figures 7 A, 7 B and 7 C show the evolution of a 65-year-old patient with venous ulcer in the left foot, external malleolus, and a picture of decompensated diabetes mellitus (4.5 g / l). During the treatment of the same, patches of a preferred embodiment of the dressing according to the present invention of 10 cm x 10 cm were placed. Figures 8 A, 8 B, 8 C and 8 D show a deep burn type B

(third degree) on the left foot by hot water in a disabled patient of 42 years and its evolution during treatment where a preferred form of dressing according to the present invention was used every 48 hours.

Figures 9 A, 9 B, 9 C and 9 D show the evolution of a 38-year-old patient who suffered deep burns type B (third degree) by fire on the right back, with a treatment using a preferred form of dressing according to the present invention.

Figures 10 A, 1O B and IO C show a shortening in the epithelialization times of the wound of an eleven-year-old patient with a third degree burn and its evolution at fifteen days by applying a preferred embodiment of the dressing according to The present invention.

Figures 11 A, 11 B, 11 C and 11 D show the evolution of a 20-year-old patient with chronic ulcer in the right thigh after severe burn, where the treatment included the application of a preferred way of carrying out the dressing according to Ia Present invention as coverage. Detailed Description of the Invention

For the purpose of clarifying the description of the invention, the terms "approximately", "of the order of", "about", and equivalents or the like, as used throughout this specification, mean that the numerical values affected are so close to the limit value that it is specifically mentioned and within a given range of values and between more and less 20% of said numerical value. This scope of indefinition that is established here is due to the errors of the determination or manufacturing methods used.

As used in the present description, the term "substantially" means that the form, circumstance, magnitude, measure or any other characteristic described but associated with it in syntactic form, resemble as much as desired to said form, circumstance, magnitude, measure or any other characteristic as it is known in a definite and unambiguous way. Specifically, with this term it is meant that what is described is equivalent to the effects of the invention or resembles the specific reference used to make the description in question, without necessarily becoming exactly the same.

The result of the study of several years on the problems related to the bandage of extensive or complex wounds, in the sense of being very exudative or with viscous and abundant secretion with the addition of bacterial proliferation, led to the realization of a new generation of apositos intended to offer a smart alternative in terms of achieving an adequate response.

The elements used on the basis of cotton present a series of problems in these situations, such as: adhesion to de-epithelized surfaces; inadequate absorption of secretions; imprints on the scar surface; Difficulty in its replacement and, above all, detachment of surfaces compromised with marked pain, which sometimes becomes very problematic their employment; need to resort to significant volumes of material per application; and inadequate exchange of secretions and detritus out of the injured area, although by saturation all the layers of cotton or cellulose used are wetted.

The problem also extends when semisynthetic or synthetic materials are used that also tend to generate inconveniences such as, for example, the lack of necessary properties to produce suitable microclimates on the injured beds in order to facilitate the numerous and complex steps of spontaneous tissue repair.

The dressing of the present invention made with materials several times more absorbent than cotton and with neutral characteristics for wounds, also allow non-adhesion to the surface thereof, thus facilitating their detachment and replacement, and subsequent healing.

The use of antimicrobial materials is a significant step forward that allows to limit bacterial reproduction even when the treating professional decides not to use a local antibiotic.

The construction of this dressing is carried out in a way that facilitates the absorption of exudates from the surface to be treated and the conduction of secretions to the upper layers that act as temporary reservoir thereof, achieving that the surfaces in epithelialization treatment have adequate humidity. .

The way to assemble it, together with the quality and differential behavior of its constituent elements, allows it to exhibit the following functionality:

1) It achieves to achieve the items pursued by the treatment of burns as extended surface wounds: a) protection of the wound; b) comfort; c) rapid rehabilitation; Y d) prevention of complications.

2) It controls the excessive evaporation of water preventing the drying of the surfaces and the eventual deepening of the lesion.

3) Mechanically protects the injured surface through its padding. 4) Provides a suitable microclimate for epithelialization, favoring cell migration.

5) Protects against external bacterial contamination by providing adequate microbial isolation.

6) It is removed from the wounds without the patient acknowledging pain, contributing substantially to the analgesia in the cure.

7) Protects the surface of neoepithelialization.

8) It effectively retains exudates and secretions.

9) Substantially increases patient comfort by avoiding adhesion and desiccation of exudates on it. 10) It offers the possibility of performing an easy, reliable and safe outpatient treatment, administered by the patient himself.

11) It slows the development of bacteria and fungi present due to their antimicrobial quality.

12) Allows its use as the only treatment in first and second degree burns.

13) Allows the use of a topical antibiotic of choice.

14) Simplify the task of covering a wound avoiding the bulky and undesirable overlap of different elements.

15) It is hypoallergenic. 16) It presents a neutral behavior on the natural evolution of the wounds, which allows it to be used as the first coverage in emergencies.

17) It does not leave imprints on the skin surface, improving the post-scar cosmetic appearance. 18) It is versatile because it allows its clinical use, if necessary, during the entire period of repair of a wound, requiring only periodic renewals of approximately 24 to approximately 48 hours. 19) It is aesthetic because if it is made in skin color it allows, as appropriate, certain social and labor action.

20) It allows to be easily fixed to the treated surfaces through an ad hoc self-adhesive tape, mounted on a device that favors a fast and efficient placement. 21) It allows to reduce treatment costs.

All these advantages over what is known in the art are effectively achieved with the use of the dressing of the present invention.

It is then an object of the present invention a dressing (1) usable as temporary coverage for the treatment of wounds comprising: a layer that contacts the affected area (4), which is a polyester fiber fabric with a harmonic openwork ligament ; a set of inner layers comprising at least three layers (5, 5, 5 ^" ) superimposed of a nonwoven or low density geotextile fiber composed of modified polyester fibers in its transverse section and cellulose fibers; and

an outer layer (9) of a spiked microfiber polyester fabric.

The layers (4, 5, 5 ^' , 5 ", 9) are superimposed on each other and are fixed by suction to make the dressings by cutting using ultrasound and laser heat simultaneously.

The fixation (2) between the layers is preferably established by the edges of the dressing, preventing the layers from moving laterally.

The manufacture of the dressing is carried out on a flat table, preferably a monolayer suction cutting table, arranging the layers that compose the dressing on each other in succession, making perforations and cuts with a laser cutting robot.

First the layer (4) of polyester fabric is placed on a flat surface, where preferably said flat surface corresponds to a monolayer cutting table, and where more preferably the fixed fabric is held in position by suction.

Next, the following layers (5, 5 ^' , 5 ") are rolled up until a first portion of the textile compound that will give rise to the dressing is completed, and the assembly is perforated or cut vertically with a laser cutting robot.

The cuts or perforations are of different types: perforations, circles, spirals, cross lines, or combinations thereof. This allows a fluid communication between the different layers that make up the dressing.

Once said first vertical drilling or cutting operation is finished, a layer (9) of a spiked microfiber polyester fabric is arranged before concluding the preparation of the dressings by separating cuts in individual units.

Preferably, this operation is done with an ultrasound cutting head by which the fibers are compacted by bending and separated simultaneously by cutting with a laser cutting robot. In this way, the layers of the dressing are completely linked by the edges forming a single unit.

The ultrasound compacts the fibers in the cutting area, ensuring a neat and efficient cutting by fusion of the fibers with laser. The laser instantly cuts the textile compound from the opposite side.

No laser cutting waste is generated. The cutting edges of the dressing are fixed by partial or total fusion of the textile fibers. Preferably, then, the dressings according to the present invention can be manufactured by a process comprising the steps of: a) arranging a layer (4) of polyester fabric on a flat surface; b) superimposing the inner layers (5, 5 ^' , 5 ^" ) of a nonwoven or low density geotextile fiber composed of polyester fibers and cellulose fibers; c) perforate or cut vertically to the set of layers formed in b);

d) disposing an outer layer (9) of a spiked microfiber polyester fabric; Y

e) cut the set of layers obtained in d) to obtain the individual dressings. Once the dressings are obtained, they are packed and sterilized. The sterilization can be done by ionizing radiation, for example gamma, alpha or accelerated electrons according to the source used, or by moist heat with water vapor. Preferably, the sterilization is carried out in an autoclave with hot steam under pressure.

Therefore, the manufacturing process described accessoryly includes the steps of: f) packing the dressings; and g) sterilize the dressing.

The first fabric that forms the layer that contacts the affected area (4), is the one that is in direct contact with the user's skin, and is 100% formed with a modified polyester continuous fiber yarn with prior twisting of a title of the order of 140/56 as raw material and which may comprise harmless antimicrobial compounds associated with the molecular structure of the fiber.

It is known that the transport of moisture or water between the polyester fibers twisted by capillarity is very fast. It therefore has the ability to transfer moisture from a liquid source, such as exudates from a wound, to the fibers of the next layer at high speed, almost instantaneously.

The fabric that forms the layer (4) one of whose sides (3) is put in contact with the affected area, is a fabric with intelligent ligament that is woven with two combs as shown in Figure 2, so that no It allows the accumulation of liquids on it since it has square openings whose diagonal is between approximately 0.5 mm and approximately 2.5 mm, oriented diagonally or rhomboidal openings, that is, quadrangular holes, which can have a diagonal greater than The other, where the size of the major diagonal is between approximately 2.0 mm and approximately 4.0 mm, and the size of the minor diagonal between 0.5 mm and 2.5 mm, which are linked by a tissue that in its transverse section presents an inverted pyramidal shape that allows the passage of liquids preventing the accumulation of microdroplets, thus maintaining the area of the patient's wound in dry treatment.

Each of the inner layers (5, 5 ^' , 5 ^" ) is a nonwoven or geotextile that comprises a very low density of fibers and since it is not woven it has the special feature of providing a large dispersion of liquids acting in all directions , transporting the liquids quickly to the next immediate layer, in this way the dispersion of liquid from the exudate of the patient's wound is achieved, thus taking advantage of the totality of the surface that the dressing presents to achieve a great dispersion capacity and accumulation.

«

This nonwoven of the third inner layer (5, 5 ^' , 5 ^" ) is composed of modified polyester fibers and cellulosic fibers, providing the dressing with the ability of an excellent dispersion of liquids horizontally, and absorbing and retaining them with a capacity of the order of 6 times its weight.

Preferably, the geotextile that forms these inner layers comprises from about 40% to about 20% of modified polyester and from about 60% to about 80% of cellulosic fiber. More preferably, the geotextile of the inner layers comprises from about 35% to about 25% of modified polyester and from about 65% to about 85% of cellulosic fiber.

More preferably, the geotextile that forms the inner layers comprises approximately 30% modified polyester and approximately 70% cellulosic fiber.

As an accessory, this geotextile that forms the internal layers of the dressing of the present invention can be formed by the following fibers: Modal, which is a modified rayon; Tencel or Lyocell, which is a modified cellulose; Coolmax, which is a physically modified polyester; PP / PE or PES white, which is polypropylene and polyester; Rhovil, which is viscose; Tactel, which is a nylon mixed with cellulose; and Viloft, which is a very absorbent viscose by transfer of moisture.

The outer layer (9) of a spiked microfiber polyester yarn fabric is a barrier between the moisture and the liquids accumulated in the fourth inner layer (5 ^" ) described above, and the external medium.

This layer (9) is formed by a microfiber polyester yarn fabric that is produced on a sheave loom with a 2 x 2 spike ligament, as shown in Figure 3.

This layer provides an effective insulating barrier that prevents, on the one hand, the draining and passage of liquids from the exudate of the wound to the outside and, on the other, it facilitates the aeration and ventilation of the wound avoiding the entry of undesirable microorganisms towards the wound.

Preferably, this fabric that forms the outer layer of the dressing according to the present invention can undergo a physical and / or chemical process, such as a tefloning process that accentuates its properties.

Antimicrobial compounds that provide a biological control action of microbes, either by eliminating them, bactericidal action, or by interfering with their multiplication, bacteriostatic action, are known in the art and are incorporated into the fibers during their manufacture.

Said antimicrobial compounds, without their statement being considered limiting the scope of this invention, may be: biguanides, phenolic compounds and their derivatives, isothiazolones, metals and their salts such as zinc salts, ammonium compounds, alcohols, and mixtures thereof.

Some antibacterial agents are incorporated into Zeolites, inorganic compounds of the sodium aluminosilicate type that can be natural or synthetic, and in this case they are combined with metals such as silver, zinc, copper, or mixtures thereof.

Another antimicrobial agent used is Triclosan, generic name of 5- chloro-2- (2,4-dichlorophenoxy) phenol, a phenolic derivative widely used in numerous hygiene products such as soaps, deodorants, skin creams and toothpastes.

Yet another agent that provides excellent antibacterial effects is chitin, a natural compound that is obtained from crabs and shrimp shells.

Three ways of incorporating the bacterial control agent into the fibers are known in the art, namely: grafting antimicrobial compounds within the structure of the textile fiber, application thereof during the textile finishing process and the introduction of antibacterial agents directly inside the textile fibers during the extrusion process.

The manufacturing process of the fiber to be used will depend on the antimicrobial agent and the material that composes the fiber, and the performance of the final product will depend on the type of fiber used, proportions with other accompanying fibers, presence or absence of other ingredients, conditions of use , such as humidity conditions, repeated washing, etc.

Without your statement being considered limiting the scope of this invention, some fibers with antimicrobial compounds that are on the market and which can be used in this invention are: between polyester fibers, polyester fiber with Bactekiller incorporated from Kanebo Gohsen Ltd. (Osaka, Japan), Diolen from Akso Nobel NV (Netherlands), and Lufnen Va from Teijin Chemicals Ltd. (Tokyo , Japan); among the acrylic fibers, Courtek M of Courtaulds Textile pie (London, England), Biokryl and Biokryl Plus of Acordis BV (Arnhem, Holland), and Deogree and Cashmilon of Asahi Kasei Corp. (Tokyo, Japan); and among the polypropylene fibers, Meraklon SR-AB of Montedison SpA (Milan, Italy) and Vegon ABM of Faserwerk Bottrop GMBH (Germany).

EXAMPLES OF EMBODIMENT The dressings according to the present invention have been satisfactorily applied in the treatment of different types of lesions such as: deep intermediate burns and deep burns, where the dressings had to remove liquefied necrotic tissue and secretions; vascular (venous) ulcers where the fragile scar advance must be protected; Pressure ulcers in diabetic foot, and traumatic infected wounds where delayed closure forces prolonged exposure of open beds.

In all these cases, the technique used consists mainly of: first performing a complete hygiene (toilette) of the wound; place an appropriate antibiotic of choice; and occlude the bed with one or more dressings according to the present invention, which is left in place for 24 hours, 48 hours and up to 72 hours.

The dressings according to the present invention that were used had a standard size of 10 cm x 10 cm. The results obtained were superior to the average using conventional bandages, allowing the healing processes to be significantly shortened. In the following cases the previously described dressings have been applied with the results detailed:

EXAMPLE 1 In Figures 4 A, 4 B and 4 C, a 38-year-old patient is shown with a deep ulcer produced by electricity in the left gluteal region with exposure of subcutaneous cellular tissue. The tissues were gradually stimulated through the successive toilets and application of dressings according to the present invention, which retained the exudates properly, allowing therapeutic progress until definitive closure, with minimal residual cosmetic sequelae and good skin condition.

EXAMPLE 2

In Figures 5 A, 5 B and 5 C, the evolution of a 48-year-old patient with type B (deep) burn by fire, located in the upper right limb, can be observed. A treatment was applied that included: performing a toilette of

The wound, progressive debridement of the deep scars of necrotic tissue, application of topical antibiotic and occlusion with a dressing according to the present invention. The previous procedure was repeated every 48 hours, achieving total elimination of the bedsores, improvement of the residual bed and epithelialization until all the compromised surface was covered and cured. The use of the dressings of the present invention was very important because they allowed separating the abundant secretion produced by this lesion from its surface, allowing the repair processes to be accelerated achieving better results in much less time. It was, in principle, a "surgical" case that could be solved by a traditional technique. Repair time was approximately 25 days.

EXAMPLE 3

In Figures 6 A, 6 B and 6 C a 29-year-old patient with deep burns type B (third degree) can be seen in both buttocks by fire. Figure 6 A shows the right gluteus. Type B bedsores of adhered necrotic tissue are appreciated. A local treatment with topical antibiotics and dressings was performed every 48 hours, achieving a rapid elimination of the sores with final healing in 21 days as seen in Figure 6 C. In Figure 6 B you can Observe the intense work of the dressing according to the present invention in the absorption of secretions and scattered tissue as part of a successful treatment.

EXAMPLE 4

In Figures 7 A, 7 B and 7 C, the evolution of a 65-year-old patient with venous ulcer in the left foot, on the external malleolus, which presents a picture of decompensated diabetes mellitus (4.5 g / l) can be observed. . The ulcer was increasing in size to cover a surface of 4 cm in diameter. A treatment was initiated that included carrying out a bed toilet, applying local antibiotics and placing patches of the dressing according to the present invention of 10 cm x 10 cm, where all the patches used had these measures. The ulcer was progressively closing until the definitive cure in approximately sixty days, when they usually remain open for years as the patient's evolution worsens. There is usually no adequate surgical treatment for them. EXAMPLE 5

In the series of Figures 8 A, 8 B, 8 C and 8 D a deep burn type B (third degree) can be observed in left foot by hot water in a disabled patient of 42 years. The series of photos shows a necrotic tissue and a very secreting bed due to excess bacterial contamination. The treatment with local antibiotics and dressings according to the present invention every 48 hours achieves a complete removal of devitalized tissues, advancement of the granulation and complete epithelialization at 40 days.

EXAMPLE 6

Figures 9 A, 9 B, 9 C and 9 D show the evolution of a 38-year-old patient who suffered deep burns type B (third degree) by fire on the right back. A treatment similar to those described for the previous cases with very good performance of the dressings of the present invention, achieving a cure in 27 days.

EXAMPLE 7

In Figures 1O A, 1O B and IO C a shortening in the epithelialization times of the wound can be observed in a 5-year-old patient with a third degree burn in the right hip. In fact, by improving the conditioning variables of the tissue repair process, namely: adequate humidity, bed cleaning and exudate absorption, the epithelialization time is favorably and decisively shortened, becoming a crucial contribution to healing. In the Figures the evolution of the healing can be followed in fifteen days, when in the current conventional treatments the healing does not occur in less than 45 days.

EXAMPLE 8

Figures 11 A, 11 B, 11 C and 11 D show the evolution of a 20-year-old patient with chronic ulcer in the right thigh after severe burn.

The patient was treated with local topical antibiotics and dressings according to the present invention, achieving a reactivation of the overall healing process and a complete closure of the wound in 30 days.

Industrial Application of the Invention

The present invention is applicable in the field of the elaboration of elements related to the treatment of wounds, especially dressings, which are capable of responding adequately to a greater number of variables involved in tissue repair processes, as well as industries related to the manufacture of the components thereof, which will be greatly benefited by having a usable dressing as temporary coverage for the treatment of wounds that provides excellent protection of the wound, patient comfort, rapid rehabilitation and prevents complications, also providing an important economic benefit.

Final considerations

Various modifications and variations of the dressing described herein according to the present invention will be apparent to those skilled in the art without departing from the scope and spirit of the invention. Although the invention has been described in relation to a specific preferred embodiment and some variants, it should be understood that the invention as claimed should not be unduly limited to said specific embodiments. In fact, it is intended that the various modifications in the manner described for carrying out the invention that are obvious to those skilled in the corresponding art field, or related fields, be included within the scope of the following claims.

The claims form part of the description of the invention object of this patent application.

Claims

1. A dressing (1) usable as a temporary cover for the treatment of wounds characterized in that it comprises: a layer that contacts the affected area (4), which is a polyester fiber fabric modified in its transverse section and harmonic ligament tissue draft a set of inner layers comprising at least three layers (5, 5 ^' , 5 ^" ) superimposed of a nonwoven or low density geotextile fiber composed of polyester fibers and cellulose fibers; and an outer layer (9) of a spiked microfiber polyester fabric.

2. The dressing usable as a temporary cover for the treatment of wounds according to claim 1, characterized in that the set of inner layers has the power to absorb and retain fluids of approximately 8 times their weight.

3. The dressing usable as temporary coverage for the treatment of wounds according to claim 1, characterized in that the outer layer does not allow the passage of liquids but vapors.

4. The dressing usable as a temporary cover for the treatment of wounds according to claim 1, characterized in that it comprises at least one antomicrobial agent accessory.

5. The dressing usable as temporary coverage for the treatment of wounds according to claim 4, characterized in that the antimicrobial agent is selected from the group consisting of fusidic acid, iodopovidone or an antibiotic such as mupirocin or gentamicin.

6. The dressing usable as a temporary cover for the treatment of wounds according to claim 1, characterized in that it comprises at least one topical corticosteroid.

7. The dressing usable as temporary coverage for the treatment of wounds according to claim 6, characterized in that the topical corticosteroid is selected from the group consisting of: clobetasol, betamethasone, prednisolone, triamcinolone, and mixtures thereof.

A process for manufacturing a dressing (1) that can be used as a temporary cover for the treatment of wounds according to any one of claims 1 to 3, characterized in that it comprises the steps of: a) arranging a layer (4) of polyester fabric on a flat surface; b) superimposing the inner layers (5, 5 ', 5 ^" ) of a nonwoven or low density geotextile fiber composed of polyester fibers and cellulose fibers; c) perforate or cut vertically to the set of layers formed in b); d) dispose of the outer layer (9) of a spiked microfiber polyester fabric; and e) cut the set of layers obtained in d) to obtain the individual dressings.

9. The method according to claim 8, characterized in that said flat surface corresponds to a monolayer cutting table, wherein the layers are held in position fixed by suction.

10. The method according to claim 8 or 9, characterized in that the perforations or vertical cuts are performed with a laser cutting robot.

11. The method according to claim 10, characterized in that the perforations or cuts are selected from: perforations, circles, spirals, cross lines, and combinations thereof.

12. The method according to any one of claims 8 to 11, characterized in that step e) is done with an ultrasound cutting head compacting the fibers by bending and separating simultaneously by cutting with a laser cutting robot on the opposite side .

13. The method according to claim 12, characterized in that the layers of the dressing are linked by fusion of the fibers with laser at the edges forming a single unit.

14. The method according to any of claims 8 to 13, characterized in that it additionally comprises the steps of: f) packing the dressings; and g) sterilize the dressing.

15. The method according to claim 14, characterized in that the sterilization is done by ionizing radiation or by moist heat with water vapor.

16. The method according to claim 15, characterized in that the ionizing radiation is of the gamma type, alpha or accelerated electrons.

17. The method according to claim 15, characterized in that the sterilization is carried out in an autoclave with hot steam under pressure.