WO2016174369A1

WO2016174369A1 - Knitted textile structure with differentiated areas

Info

Publication number: WO2016174369A1
Application number: PCT/FR2016/051014
Authority: WO
Inventors: Nadège BOUCARD; Eric Mignot; Charlotte DONGE; Jacques Tankere
Original assignee: Mdb Texinov; Deltaval
Priority date: 2015-04-30
Filing date: 2016-04-29
Publication date: 2016-11-03
Also published as: EP3289130A1; FR3035666B1; FR3035666A1

Abstract

A knitted textile structure with differentiated areas and use of same. Said knitted textile structure is obtained in a single step using warp knitting technology on a Raschel or hook warp knitting machine. The textile comprises a central area (101) delimited by a peripheral area (102), said areas having different densities and/or different mechanical characteristics.

Description

TRICOTE TEXTILE STRUCTURE WITH DIFFERENTIATED ZONES

FIELD OF THE INVENTION The present invention relates to a knitted textile structure having differentiated zones, more particularly in terms of the dimensions of the openings that it comprises, in terms of density, or even in terms of physicochemical characteristics. It is particularly applicable in the medical field, and more in the field of producing dressings intended to cover a wound or scar. It is also applicable in implants or in areas of mechanical stress or composites of parts in three dimensions. PRIOR STATE OF THE ART

Healing involves a number of phenomena leading to closure of a wound, and more particularly to restore the continuity of skin development.

For this purpose, it is known to use dressings intended to protect and / or facilitate the healing of open wounds. In the particular case of exudative wounds, such as pressure ulcers, burns, etc., the textile constituting the dressing must be peel-and-open, the size of the pores or openings, defined by the calculation of the percentage of opening area by relative to the total area, being controlled to facilitate the transport of exudates out of the wound, often towards an absorbent layer. The size of the pores is adapted to the healing phase, the larger pores being used at the beginning of healing. Then, as and when the healing progresses, the pore size decreases, in order to respect the fleshy bud constituting an essential element of said healing.

The surface of the textile in contact with the wound must be smooth and non-adherent, in order to avoid tearing of the healing zone at the time of the change of dressing. It is known that the dressings made of complex composites, such as for example described in the document WO 2006/044882, are capable of comprising an absorbent layer and / or a compressive layer, associated with an adhesive support intended to maintain the dressing on the surface. skin, but also to provide a wound protection function against the external environment.

The various layers constituting such a complex are difficult to bond to one another, due to the fact that the textile surface in contact with the wound is most often functionalized by an anti-adherent agent (see for example US 2013 / 150763), or coated with an oil emulsion in order to preserve the entirety of the reconstructed biological tissues at the time of the dressing change, in particular during the budding phase, that is to say, cell proliferation and producing extracellular matrices, i.e., during the most critical phase of healing.

Moreover, it results from the implementation of the dressings of the prior art a number of difficulties, among which may be mentioned:

a weakness of the mechanical properties at the periphery of the textile structure, insufficient to withstand handling, and insusceptible to withstand the pulling force of the dressing, likely to induce a tear at the time of change of dressing,

a weakening of the adhesive zone when using son or non-stick coating, making the process of manufacturing the dressing more complex and more expensive.

In the field of textile implants, more particularly used in pathologies such as urinary incontinence, parietal reinforcement (herniation, hernia), cardiovascular implants, ligamentous implants, etc., it is known to use the technology known as discarded mesh, because of the possibility that it offers to obtain peelable products, besides adapting the porosity of the textile according to the level of colonization desired for the area to be treated.

In fact, various processes and textile weaves have been described in order to obtain effective porosities (see, for example, FR 2 984 370), said porosities being identical at all points of the textile structure. It has also been described in the same application self-fixation systems of the implant, or even association with bioactive or adhesive layers in order to activate or on the contrary to deactivate cell colonization (see for example EP 2 556 845).

Whatever the purpose of these implants, the mechanical reinforcement of the latter is never discussed in terms of armor variations.

SUMMARY OF THE INVENTION

One of the objectives of the invention is to provide a knitted textile structure, obtained by the mesh technology discarded on a warp, Rachel or hook, obtained in a single step, fundamentally aimed at defining differentiated areas. This knitted textile structure comprises a central zone delimited by a peripheral zone, said zones having different densities and / or different mechanical characteristics.

In other words, the invention consists in producing, in a single step, by the jersey knitting technology, in particular on a warp, Rachel or crochet, a knitted textile structure defining different zones intended to perform functions according to the invention. themselves different.

According to an advantageous characteristic of the invention, the respectively central and peripheral zones also have different conformational possibilities, that is to say are likely to adopt a non-planar shape. Typically, the central zone is likely to adopt a curved shape, even though the peripheral zone is flat. This differentiation is obtained on the knitting machine by acting on the absorbed son length, that is to say supercharging the armor implemented, thereby generating a surplus of textile structure that can then be deformed.

This differentiation of the characteristics of the zones, respectively central and peripheral, can also result in a variation of the dimensions of the openings or pores. Thus, and in an application more particularly intended for dressings, the central zone defines apertures larger than those of the peripheral zone or zones, and typically between 50 micrometers and 5 millimeters, even though the peripheral zone has openings of dimensions typically between 25 micrometers and 3 millimeters. In this case, the cicatrization phenomenon, and in particular the exudates out of so-called exudative wounds, is favored.

In other applications, including in the field of dressings, this variation in dimensions can be reversed, that is to say that the peripheral zone can define larger openings than those defined by the central zone.

This central zone can adopt any shape, including square, rectangle, oval, or other.

According to the invention, the central zone may be made of anti-adhesion material, and for example silicone-wrapped PET (polyethylene terephthalate); but it can also be made of absorbable materials, including bioresrobables, such as PLA (poly lactic acid), PLG (polyglycolic acid), PCL (polycaprolactone), chitosan.

The peripheral zone is advantageously made of a material chosen from the group comprising: polyamide, polyether terephthalate (PET), polyethylene, polypropylene, PEEK (polyetheretherketone), mineral fibers (glass, basalt), but also of materials bioabsorbable of the type previously mentioned in relation to the central zone.

In the more particular case of the application of the invention to dressings, the peripheral zone receives on one of its faces an adhesive film, preferentially by laminating or thermo-bonding, intended to ensure the joining of the dressing on the surface. skin of a patient.

In the context of the invention, it is also conceivable to produce the textile structure in the form of a sheet, defining a plurality of elementary structures, that is to say structures comprising a central zone associated with a peripheral zone. Such a sheet resulting from the knitting machine, is then cut according to the needs. In the particular case of the application of the invention to implants, the central zone consists mainly of non-absorbable materials in order to ensure the permanent and constant effect over time, and thus to provide the desired reinforcement function, while that the peripheral area is, for its part, made mainly of absorbable materials, in particular to facilitate the grip and pause.

According to the invention, the density is greater in the peripheral zone than in the central zone, in order to ensure the mechanical properties of the structure. The textile structure of the invention is capable of having an elongation extension capacity, in particular along the two directions of the plane in which it fits, typically between 5 and 170%.

This variation of elongation capacity can result from the armor implemented. Such a variation in elongation capacity may be advantageous for composite applications, thus allowing the structure to be adapted to complex shapes.

The textile structure of the invention may also further comprise a layer made of a woven, knitted or non-woven material, or even a film. This layer is secured to the structure directly on the knitting machine, in this case a Rachel trade. Thus, in the context of the application of the structure of the invention to dressings, it becomes possible to integrate during the production of said structure, an absorbent layer, for example of the foam type, capable of containing the exudates, this , and again, in one step.

SHORT EXPOSE FIGURES

The way in which the invention can be realized and the advantages which result therefrom, will emerge more clearly from the following exemplary embodiments, given as an indication and not by way of limitation, in support of the appended figures, in which:

Figure 1 is a schematic representation of the knitted textile structure according to the invention implementing an elementary cell.

FIG. 2 is a diagrammatic representation of a sheet coming from a knitting machine, incorporating a plurality of these elementary cells. Figure 3 is a schematic representation illustrating the various son and armor implemented according to a first embodiment of the invention.

Figure 4 is a view similar to Figure 3 of a second embodiment of the invention.

DETAILED DESCRIPTION OF THE INVENTION

As can be seen in FIG. 1, and according to an essential characteristic of the invention, the knitted textile structure of the invention basically comprises two zones, a central zone (101) delimited by a peripheral zone (102).

According to the invention, these two zones have different densities. This variation in densities can result from a variation in the dimensions of the openings or pores of the respective zones.

Thus, the central zone, as can be seen in Figures 1 and 2, has openings larger than the peripheral zone Corollary it also has a lower density than the peripheral zone.

In fact, the dimensions of the openings of the central zone may be between 50 micrometers and 5 millimeters, even though those of the openings of the peripheral zone may be between 25 micrometers and 3 millimeters.

This knitted textile structure is obtained in a single step, using the so-called mesh technology thrown on a loom chain, Rachel or hook.

In fact, and by way of example, there is implemented a five-bar loom fed son, three serving essentially to obtain the peripheral zone, and the two others serving essentially to obtain the central zone.

When creating the peripheral zones, the five bars can operate according to the following design:

a first bar is a barbell,

a second bar feeds a capstan wire to ensure the mechanical properties, and a third bar provides a total frame, necessary for the cohesion of the whole.

Corollary, two bars do not mesh, so that two technical solutions can be considered:

the first is to hide the son intended to constitute the central zone, either by an introduction in capstan, or by an armor allowing to introduce straight threads, that is to say oriented production direction, without they stand out on the surface of the textile, such as for example in string armor,

the second consists in allowing the wires in question to leave the structure, that is to say leaving them free at the exit of the knitting members, these threads being found in the peripheral zone in floating form, and are then cut after completion of the structure. The realization of the central zone is then carried out as follows by way of example: two of the bars mesh and the armor is adapted to the geometry of the pores, in particular according to the desired shape and dimensions, such as for example by setting implement a net armor. The other three bars provide an armor so as to hide these son in the structure, either by capstan introduction, or by an armor that allows to introduce the straight son without they emerge from the surface of the textile, such as for example chain type. According to the invention, the shape and the size of the openings, in particular of the central zone, are played according to:

the nature of the wires used;

the mono- or multi-filament nature of the threads;

the profession's tonnage;

- the density of the meshes;

selected armor

the number of knitting bars in the loom;

It is conceivable when the large number of parameters thus allowing to vary this shape and these dimensions. FIG. 2 shows a textile ply (200) derived from a knitting machine operating according to the jet knit technology, of the chain, Rachel or hook type, and defining a plurality of elementary ones each integrating a central zone. (201) and a peripheral area (202). Such a sheet may then be cut, precisely to obtain said elementary structures.

FIG. 3 is thus an exemplary embodiment of the invention with bindings offering a method of construction typically adapted to the dressing function. In the production direction, therefore, lengths respectively identified by A and B are distinguished, which can be different and adapted to the types of wounds to be treated, and generally to the desired size of the central zone.

In parallel, and in the cross direction, there are defined areas of widths, respectively C and D.

Thus, intersecting areas A and C define the central areas of the structure of the invention. In the first exemplary embodiment illustrated in FIG. 3, the zone D, therefore limitingly constitutive of a part of the peripheral zones, consists of wires (301) working in a chain with wires (302), which work in sectional frame, so as to obtain a structured zone, fairly solid, that is to say, fairly mechanically resistant. Typically, these son are made of polyester, whose mechanical strength is known, and moreover, biocompatible and therefore likely to be implemented for medical applications.

Within zone C, specific threads (304, 305), such as silicone-coated polyethylene terephthalate (PET) are used, said yarns working in "cellular" weave or armor or in atlas, that is, that is to say armor to mesh diagonally evolving on different columns or needles of the knitting machine to create effects of "days", this on two or more rows to create the days or openings, and so for create a certain relief of this part at the same time to conceal the other son (301, 302) compared to the background binding, necessary for the cohesion of the structure. These particular wires will reappear in zones B to get closer to the configuration of zones D. In addition, wires (303, which remain in capstan, therefore very discrete in zone A, will work in sectional weft in zone B to reinforce the mechanical cohesion of the textile structure.The particular wires (304, 305) made in Silicone-wrapped PETs are in turn concealed in the cape-shaped zone B (thus substantially straight), that is to say in a substantially straight structure so as to be hidden and without surface contact. embodiment of Figure 4, it is also possible to provide the appropriate release son son (404, 405) of Part B. In this case, as for the manufacture of lace on loom knit, it is possible to cut these son in a complementary step called shaving or typing.The other son of the structure, respectively (401), (402) and (403) performing the same functions as the son respectively (301), (302) and (303) of Figure 3.

The whole of the interest of the present invention is conceived which makes it possible to carry out, in addition, these steps, a knitted textile structure having distinct zones, with distinct functions, which are particularly suitable both for application to dressings and to implants.

Claims

A knitted textile structure obtained by the single-step chain-mail knitting technology, Rachel or crochet, comprising a central zone (101, 201) delimited by a peripheral zone (102, 202), said zones having different densities and / or different mechanical characteristics.

2. Knitted textile structure according to claim 1, characterized in that the respectively central and peripheral zones also have different conformations, that is to say are likely to adopt a non-planar shape.

3. knitted textile structure according to claim 2, characterized in that the central zone adopts a curved shape as a result of the knitting operation by adjusting the length of son absorbed.

4. Knitted textile structure according to one of claims 1 to 3, characterized in that the difference in densities of the respectively central and peripheral zones results from a variation in the dimensions of the openings or pores that said zones define.

5. Knitted textile structure according to claim 4, characterized in that the dimensions of the openings of the central zone are between 50 micrometers and 5 millimeters, and in that those of the peripheral zone are between 25 micrometers and 3 millimeters.

Knitted textile structure according to one of claims 4 and 5, characterized in that the openings of the central zone are of square, rectangular or oval shape.

Knitted fabric structure according to one of claims 1 to 6, characterized in that the central zone is made of material with anti-adhesion properties, and in particular PET (polyethylene terephthalate) silicone sheathed.

Knitted textile structure according to one of claims 1 to 6, characterized in that the central zone is made of a resorbable material, selected from the group comprising PLA (poly lactic acid), PLG (polyglycolic acid), PCL (polycaprolactone), chitosan.

Knitted textile structure according to one of Claims 1 to 8, characterized in that the peripheral zone is made of a material chosen from the group comprising: polyamide, polyether terephthalate (PET), polyethylene, polypropylene, PEEK (polyetheretherketone), mineral fibers (glass, basalt), but also bioabsorbable materials of the type previously mentioned in relation to the central zone.

Knitted textile structure according to one of claims 1 to 9, characterized in that the peripheral zone receives on one of its faces an adhesive film.

Knitted textile structure according to one of Claims 1 to 6, characterized in that the central zone consists mainly of non-resorbable materials, and in that the peripheral zone is predominantly made of absorbable materials.

12. Knitted textile structure according to one of claims 1 to 11, characterized in that it has an extension capacity yes elongation, typically between 5 and 170%.

13. Knitted textile structure according to one of claims 1 to 12 characterized in that it further comprises a layer made of a woven material, knitted or nonwoven, or a film, associated with the structure directly on the craft knitting, and especially on a Rachel loom.

14. Use of the knitted fabric structure according to one of claims 1 to 10 and 12, 13 for producing a dressing.

15. Use of the knitted fabric structure according to one of claims 1 to 6, 1 1 and 12 for producing an implant.