EP3976867A1

EP3976867A1 - Device comprising at least one elastic textile part equipped with an inductive elongation sensor wire, use of such a device and method for measuring the variation in the inductance of a magnetic coil created by said inductive elongation sensor wire

Info

Publication number: EP3976867A1
Application number: EP20729088.3A
Authority: EP
Inventors: Clotilde SOUCHE; Olivier NEYTON; Dominique ARNOUX; Laurent BOSSY
Original assignee: Thuasne SA
Current assignee: Thuasne SA
Priority date: 2019-06-03
Filing date: 2020-06-03
Publication date: 2022-04-06
Also published as: FR3096692A1; FR3096692B1; WO2020245220A1

Abstract

The present invention relates to a device comprising at least one textile part that is elastic in at least one first direction, the textile part comprising an inductive elongation sensor wire (120) comprising an elastic core wire (125) and an electrically conductive covering wire (130) forming turns (135) around said elastic core wire (125), and the electrically conductive covering wire (130) comprises a filament or a plurality of filaments, each of the or said filaments comprises an electrically conductive core covered with an electrically nonconductive sheath. The present invention also relates to the use of such a device for measuring the variation in the inductance of the magnetic coil created by said inductive elongation sensor wire (120) when the elastic textile part is extended in the first direction, and to an associated measurement method.

Description

Device comprising at least one elastic textile piece equipped with an inductive elongation sensor wire, use of such a device and method of measuring the variation in the inductance of a magnetic coil created by said inductive elongation sensor wire .

Technical area

The present invention relates to devices, in particular medical and / or sports, comprising at least one elastic textile part in at least a first direction, said textile part comprising at least one inductive elongation sensor wire.

The present invention also relates to the use of such a device and to a measurement method implementing said device.

Prior art

Medical articles with elastic zones, such as lumbar support belts, or orthoses, or compression stockings, must be correctly placed on the part of the body to be treated so that the patient can observe

correctly its treatment.

There is thus a need to assess the behavior, in particular elastic and / or deformation, of a medical device comprising an elastic textile part when worn in order to improve the performance of the medical device, and its compliance by the patient. .

Electrically conductive wires can be used in a textile part to capture and transmit information collected on the wearer.

However, the implementation of an electrically conductive thread in a textile part presents many constraints since, by definition, a conductive thread not being elastic, stiffens the textile part, modifies its appearance and its feel, and can create allergic reactions if it comes in contact with the skin.

The implementation of a conductive thread in an elastic textile part further complicates its implementation, since the conductive thread must not be broken or its electrical conductivity properties degraded during the elongation of the textile part.

FR 2.869.047 B1 relates to a woven textile piece comprising an electrically conductive and elastic composite yarn used as a deformation sensor. The composite yarn comprises an elastic core of low count, 44 dtex, covered by wrapping with a conductive yarn having a polyamide core covered with silver, having a count of the order of 33 to 44 dtex. This composite yarn can only be used in woven textile pieces and is not suitable for knitted textile pieces for which the deformation of the loops would disturb the measurement of the variation in conductivity. electric. The variation in the electrical conductivity measured in the tissue during its deformation would make it possible to evaluate a certain degree of elongation. The deformities studied are respiratory movements or uterine contractions. The turns are contiguous in order to conduct electricity from one turn to another, their variable spacing causing a variation in conductivity, the turns however remaining in contact with each other in order to conduct electricity from one turn to the other in a stretched state or at rest. In addition, the crossing of the conductive threads, arranged both as a warp and as a weft in the fabric, risks causing short circuits.

CA 2,493,145 relates to an electrical and elastic conductive wire comprising an elastic core wire and at least one electrically conductive wire wound around the elastic core wire. The number of turns of the conducting wire and of the binding wire, around the elastic core wire must be sufficient, of the order of 3200-3600 turns / m, so that the electricity is conducted by contact from one turn to the next. the other and that the electrical conductivity does not decrease under the effect of an over-elongation of the conducting wire. The number of turns per meter of the conductive yarn and of the binding yarn are very large, which limits the elastic properties of the elastic core yarn. These conductive threads are used for the manufacture of heating textiles and not for measuring the elongation of the latter.

WO 2006/034291 A2 relates to a sensor for monitoring respiratory plethysmography by inductance. This type of sensor comprises an elastic fabric encircling the thorax of the wearer, and a conductor sewn in a zig-zag way flat on the surface of the fabric. The conductor does not form turns around a core wire, in particular elastic, but portions encircling the thorax of the wearer. The circumference of these portions varies according to the elongation of the textile as a function of the respiratory movements.

There is therefore a need for a device, in particular medical and / or for the practice of a sport, comprising an elastic textile piece, said device is configured to allow the evaluation of the elastic behavior of the textile piece, and therefore its behavior in the body. wear, without altering the essential elastic properties sought for the textile piece.

There is also a search for a device, medical and / or for practicing sport, which does not include, when worn, and in particular when at rest, zones which conduct electricity and which may come into contact with the wearer's skin.

Purpose and summary of the invention

The present invention aims to provide a device comprising a textile part comprising at least one inductive elongation sensor yarn in order to evaluate the elongation of the textile part, in particular in the direction of insertion of said sensor yarn into the textile part, by measurement of the variation of the inductance (pHenry) of the coil created by this sensor wire. The present invention also aims to provide a device for exchanging signals and / or transferring electrical energy through said inductive elongation sensor wire.

The present invention relates to a device, in particular medical and / or for practicing a sport, comprising at least one elastic textile part in at least a first direction, the textile part advantageously comprising at least one inductive elongation sensor wire. , said inductive elongation sensor yarn comprising an elastic core yarn and an electrically conductive cover yarn forming turns around said elastic core yarn, the electrically conductive cover yarn comprising one or more filaments, each of said filament (s) comprises an electrically conductive core covered with a non-electrically conductive sheath.

Advantageously, the electrically conductive covering wire thus forms a coil capable of generating a magnetic field under the effect of a current (A) passing through the electrically conductive covering wire. The inductance of the coil varies, in particular increases, as the elastic core wire lengthens and the turns move apart from each other.

Given that the inductance (and not the electrical conductivity) is measured for the evaluation of elasticity, it is not necessary (which is moreover not possible due in particular to the electrically insulating sheath and of the non-contiguous arrangement of the turns) that the turns conduct electricity by contact from one turn to another, which makes it possible in particular to limit the number of turns or turns / m and thus preserve the elastic properties and the feel of the elastic textile piece.

Furthermore, it is not desired that the conductive covering yarn releases heat so that the number of turns, and therefore the linear quantity of conductive covering yarn in the textile piece is important so that the heat released is significant.

The non-electrically conductive (or electrically insulating) sheath allows

advantageously to avoid short-circuits during a possible contact of the turns with one another, and to avoid contact with the skin of the conductive part (which is compulsory in the case of a medical device).

In addition, said sheath makes it possible to improve the resistance to washing and to abrasion of the conductive core.

The inductance values are measured in micro Henry (pH). The medical device may comprise one or more elastic textile pieces according to the invention, assembled for example by sewing or welding, in particular chosen from elastic knitted textile pieces and / or elastic woven textile pieces.

The medical device can also comprise one or more textile parts, elastic or not, assembled with one or more elastic textile parts according to the invention (i.e. each comprising at least inductive elongation sensor wire).

Any textile piece in the present text, elastic or not, has a longitudinal direction, in particular corresponding to the direction of the columns of stitches when the textile piece is a knitted piece, or to the warp direction when the textile piece is a woven piece; and a transverse direction, in particular corresponding to the direction of the rows of stitches (also designated weft in the technical field) when the textile piece is a knitted piece, or to the weft direction when the textile piece is a woven piece.

Preferably, the longitudinal direction is substantially perpendicular to the transverse direction. Said first direction may be said longitudinal direction, or the transverse direction, or a secant direction in the longitudinal and transverse direction.

Preferably, said at least one inductive elongation sensor wire is arranged in the elastic textile piece in the first direction.

Said textile piece can also be elastic in a second direction, different from the first direction. The second direction can then be said longitudinal direction, or the transverse direction, or a secant direction in the longitudinal and transverse direction. A second inductive elongation sensor wire (identical to or different from the first sensor wire) may be arranged in said second direction.

In some embodiments, an inductive elongation sensing wire may extend in both the longitudinal direction and the transverse direction. For example, when the inductive elongation sensor wire extends diagonally (then corresponding to said first direction) of the elastic textile part (in a cutting direction, not at right angles, the longitudinal direction and the transverse direction), for example in the form of weft yarns over several columns of stitches on a knitted piece of fabric with chain stitches.

By elastic textile part in at least a first (and / or second) direction (s) is understood, any elastic textile part capable of elongating at least 100%, more preferably at least 200%, in particular at more than 400%, in particular not more than 300%, in said at least a first (and / or second) direction (s), under the effect of a given force (less than the breaking force), with a recovery of its initial form, returned to rest and stabilized, to plus or minus 5%. These values can be determined, for example, using the NF EN ISO 2062 standard of January 2010. Advantageously, the inductive elongation sensor wire is elastic.

Preferably, the inductive elongation sensor wire has an elongation at break greater than or equal to 100%, preferably greater than or equal to 150%, in particular less than or equal to 350%, more particularly less than or equal to 250%. These values can be determined, for example, using the NF EN ISO 2062 standard of January 2010.

Preferably, the electrically conductive core is in an electrically conductive metal or an alloy of electrically conductive metals.

Preferably, the electrically conductive metal or the alloy of electrically conductive metals is chosen from: copper, silver, steel or a mixture of the latter.

Preferably, the sheath is in a mixture of one or more electrically non-conductive polymer (s), preferably chosen from: polyurethane, polyamide, polyester (polyethylene terephthalate), polyethylene , polypropylene, silicone, or a mixture of these.

Preferably, the sheath is an electrically insulating varnish.

Said at least one inductive elongation sensor wire makes it possible, via the measurement of the variation in inductance during the deformation of the elastic textile part, to measure variations in angles (in particular between the taut position of a joint, for example that of the knee at 180 ° for an extended leg, and the bent position of this joint, for example that of the knee of 90 ° when the leg is bent), to assess compliance (worn state or unworn state) , to measure the level of tightening of the medical device on the part of the body to be treated, to measure the tension of a device, to measure the pressure exerted on the part of the body to be treated by the device.

In one embodiment, said at least one elastic textile piece exerts a compressive effect.

The device, in particular medical and / or for the practice of a sport, according to the invention can thus be a stocking, a tights or a compression sock, a lumbar support belt, a support and / or support orthosis. a joint (eg knee, elbow, wrist, ankle or shoulder), or a compression band. In one embodiment, the elastic textile piece comprises at least one localized measurement zone of the inductance (pH) comprising at least one inductive elongation sensor wire extending between points A and B, in particular in said at least a first direction, said measuring zone being adjacent to at least one region of the elastic textile piece not comprising an inductive elongation sensor wire, preferably being disposed between regions of the elastic textile piece not comprising a sensor wire d inductive elongation. In particular, the surface of the measurement zone represents less than 50%, more

particularly less than 30%, even more particularly less than 20% of the total surface of the elastic textile part.

Preferably, the conductive parts of the inductive elongation sensor wire at points A and B are in electrical connection with the electrically conductive areas of an electronic card or the pins of a measuring device. Preferably, the electronic card is secured to the textile part, for example by gluing, sewing or by being placed in a pocket, one of the walls of the pocket being formed by the elastic textile part comprising the points A and B.

The electronic card can also be placed in a plastic box secured directly or indirectly to the textile part.

In one embodiment, the elastic textile piece can comprise several localized measurement zones.

In the present text, the term “elastic thread” is understood to mean (for example: the elastic core thread and / or the thread A and / or the thread B, and / or the thread C defined below, and / or any wire generally different from the inductive elongation sensor wire considered as a whole), a wire having an elongation at break greater than or equal to 50%, preferably greater than or equal to 100%, and more preferably greater than or equal to 2000 %, preferably greater than or equal to 300% (in particular less than or equal to 600%).

In the present text, the term non-elastic yarn, for example yarn A and / or yarn B, and / or yarn C defined below, is understood to mean a yarn having an elongation at break less than or equal to 50 %

These values of elongation at break can be determined for example using standard NF EN ISO 2062 of January 2010. The titers (dtex) indicated in this text can be measured using standard NF EN ISO 2060 of June 1995.

The term “loaded mesh” is understood to mean the arrangement of a thread on a loop without this thread itself forming a loop.

In the present text, the term yarn denotes a yarn spun from fibers, a yarn

multifilament, a wrapped yarn, a monofilament yarn, or a combination of these, in particular which can undergo a knitting or weaving step.

Preferably, said elastic yarn (s), in particular the elastic core yarn of the inductive elongation sensor yarn, is / are one or more elastic monofilament yarn (s), and / or, one or more elastic multifilament yarn (s).

The said elastic monofilament yarn (s), and / or the yarn (s)

elastic multifilament (s), is / are preferably elastane, that is to say based on polyurethane, for example such as those marketed under the brand Dorlastan®, or Lycra®. The monofilament elastic thread (s) and / or

multifilament (s) can / can also be made of latex, that is to say based on natural or synthetic gum, such as for example elastodiene, or in any other equivalent material known from the state of the art. In one embodiment, the elastic yarn (s) a / each have a count greater than or equal to 250 dtex, in particular greater than or equal to 300 dtex, and less than or equal to 2000 dtex. This or these elastic thread (s)

may / may each comprise one or more covering yarn (s), such as the covering yarn C according to the invention, twisted or wrapped.

The electrically conductive cover yarn can be arranged around the elastic core yarn by wrapping or twisting.

The elastic textile piece according to the invention also comprises at least one thread A, and optionally at least one thread B. Preferably, the thread (s) A and / or B are not conductive (s) of the 'electricity.

In one embodiment, the elastic textile piece is knitted and comprises at least one thread A, elastic or inelastic, and optionally one thread B, elastic or inelastic, each forming stitches (loaded and / or looped), in this so called "mesh thread", and / or is / are woven (s).

In the present text, the thread, at least partly screened, is understood to mean a thread extending in a substantially rectilinear manner in the weft direction in the screened section without forming any stitches.

In another embodiment, the elastic textile piece is woven, and comprises at least a first thread A, elastic or inelastic, and a thread B, elastic or inelastic, the thread A is arranged in a warp (warp thread) , and the thread B is arranged in the weft (weft thread). Wire A can be the same or different from wire B.

In general, the yarn (s) A and B (in particular non-elastic) and / or the covering yarn (s) C defined below, is / are in one or more selected materials ( s) from natural materials (animal, plant, mineral), artificial materials (cellulose-based, etc.), and synthetic materials (organic polymers, inorganic polymers), or their mixture.

Preferably, the yarn (s) A and B (in particular non-elastic) and / or the covering yarn (s) C defined below, is / are in one or more selected materials (s). ) in the group comprising: polyamide 6, polyamide 6-6, polyamide 12, polyamide 4-6, polypropylene, polyethylene, polyester such as polyethylene terephthalate, cotton, viscose, silk, wool, polyacrylic, and a mixture of these. Preferably, the count of yarn A and / or the count of yarn B, and / or the count of yarn C, optionally elastic (s), is / are between 8 dtex and 700 dtex, more preferably 8 dtex and 350 dtex, in particular between 44 dtex and 350 dtex, for example less than or equal to 250 dtex. In one embodiment, the titer (dtex) of yarn A and / or the titer of yarn B is / are less than or equal / equal, in particular at least 1.5 times, to the titer (dtex) of the elastic core wire of the inductive elongation sensor wire.

Advantageously, the inductive elongation sensor yarn can be used on a loom, on a circular knitting loom or on a rectilinear knitting loom.

The inductive elongation sensor yarn can also be attached to the elastic textile piece by sewing or embroidery, although this is not preferred.

The knitted textile piece may be a warp-stitch (or chain-stitch) or pluck-stitch knit, preferably a pluck-stitch knitting.

Advantageously, a single inductive elongation sensor wire is sufficient to measure a deformation unlike resistive wires in the state of the art requiring the arrangement of several conductive wires in the same direction which must be in contact with each other to measure. a variation in electrical resistance.

In addition, since fewer inductive wires according to the present invention are needed to measure deformation (compared to resistive wires), this limits the number of electrical connections to be made to collect information, and thus improves the comfort and feel of the device. medical device.

In one embodiment, the turns in the electrically conductive cover wire form a single layer of turns.

In fact, in the state of the art, when the variation in electrical conductivity is sought, for a high number of turns / m, the turns may overlap and thus form two superimposed layers of turns.

The number of turns per meter made by a given wire (electrically conductive covering wire and / or covering wire C) on the elastic core is measured when the elastic core is at rest, ie in an unstretched state .

In one embodiment, the ratio corresponding to the ratio of the length of the conductive covering wire necessary to manufacture 100 cm of inductive elongation sensor wire to 100 cm of inductive elongation sensor wire is greater than or equal to 1.50 and less than or equal to 4.0; preferably greater than or equal to 2.0 and less than or equal to 3.5; in particular greater than or equal to 2.3 and less than or equal to 3.2. Said length of the electrically conductive cover wire is obtained over 100 cm of inductive elongation sensor wire by untwisting the electrically conductive cover wire so that it has a substantially rectilinear direction.

In a variant, the turns are not contiguous, the space e between two adjacent turns is greater than 0 mm when the textile part is at rest, in particular greater than or equal to 1 mm, more particularly less than or equal to 10 mm, in particular less than or equal to 5 mm.

The turns are not contiguous, that is to say that they are not in contact with each other whether it is when the medical device is at rest (ie in an undeformed or elongated state) or worn ( ie in a deformed and / or elongated state).

This characteristic is easily measured, by manually removing a possible outer covering thread, such as the covering thread C, either visually or using a microscope comprising a graduation. The measurement can be carried out on an average of five samples of 3 cm to 10 cm in length of inductive elongation sensor yarns recovered from one or more elastic textile part (s).

The turns are therefore spaced from one another, each space allowing the elastic core wire to appear between two adjacent turns.

Advantageously, the electrical resistance (in particular measured between the entry and exit points of the inductive elongation sensor wire in the elastic textile part), and therefore correlatively the electrical conductivity (ohms), remain substantially unchanged (i.e. constant (s )) when the medical device is at rest (ie not worn) or worn (that is to say under the normal conditions of use recommended in its instructions corresponding to a lying state).

In particular, the elastic textile piece has a variation in the electrical resistivity (ohms) measured in said at least one first direction (in particular between an entry point and an exit point of the inductive elongation sensor wire), between a position at rest, and a stretched position, equal to 0 or less than or equal to 1 ohm, in particular less than or equal to 0.5 ohms, in particular less than or equal to 0.05 ohm.

The variation of the electrical resistivity (in absolute value) is equal to the measurement of the electrical resistivity measured at rest at a point A of the elastic textile part in said at least one first direction, minus the measurement of the electrical resistivity measured in the stretched position in said first direction at a point B of the elastic textile piece. The stretched position preferably corresponds to an elongation in said first direction greater than or equal to 0% and less than or equal to 150%, in particular greater than or equal to 5% and less than or equal to 100%. Said textile piece comprises at at least one inductive elongation sensor wire extending between points A and B (A being different from B), in particular in said at least one first direction.

This arrangement also makes it possible to preserve the elastic properties of the inductive elongation sensor wire as much as possible and to reduce the quantity of “rigid” conductive covering wire for the benefit of touch and comfort.

In an alternative embodiment, the number of turns or turns per meter of the electrically conductive covering wire around the elastic core wire is greater than or equal to 150 turns / m and less than or equal to 2500 turns / m, preferably greater than or equal to 500 revolutions / m and less than or equal to 2000 revolutions / m, in particular between 650 revolutions / m and 1660 revolutions / m (limits included).

The inventors have found that this interval makes it possible to reliably measure the variation of the inductance and makes it possible to retain a core yarn sufficiently elastic to impart elastic properties to the textile part, and possibly a compressive effect.

In one variant, the inductive elongation sensor wire comprises at least one covering wire C, in particular non-elastic.

Said covering yarn (s) C may / may be arranged around the elastic core yarn, in particular around the turns formed by the electrically conductive covering yarn, preferably by wrapping (c ' that is, by single or double wrapping) or twisting.

The said covering yarn (s) C is / are preferably one or more yarn (s)

multifilament (s).

Said covering yarn (s) C have a count (dtex) lower, preferably at least three times lower, preferably at least five times lower than the count (dtex) of the elastic core yarn.

Preferably, the cover wire (s) C is / are not conductive (s) of electricity. In one embodiment, the number of turns or turns per meter of the covering thread (s) C around the elastic core thread, in particular previously covered with the electrically conductive covering thread, is greater than or equal to 150 revolutions / m and less than or equal to 2,500 revolutions / m, preferably greater than or equal to 500 revolutions / m and less than or equal to 2000 revolutions / m, in particular between 650 revolutions / m and 1,660 revolutions / m (limits included). In a variant, the cover wire C is placed around the assembly formed by the electrically conductive cover wire and the elastic core wire, so as to form an outer cover. This cover yarn helps protect the electrically conductive cover yarn from abrasion and during washing.

In a variant, the medical device comprises a woven textile piece, and the inductive elongation sensor wire is a warp wire.

In a variant, the medical device comprises a knitted textile piece, and the inductive elongation sensor yarn is woven and / or forms loaded stitches.

In the two preceding variants, the most straight possible path is sought so that the path of the inductive elongation sensor yarn in the textile part interferes as little as possible with its elongation.

In one variant, the inductive elongation sensor wire is placed in the textile part so that:

- In the case of a knitted textile piece, two adjacent rows of stitches in the weft direction, each comprising an inductive elongation sensor yarn, are spaced apart by at least one row of stitches in the weft direction; or

- In the case of a woven textile piece, two warp yarns each comprising an inductive elongation sensor yarn, either adjacent or spaced apart by at least one warp yarn

intermediate without inductive elongation sensor wire.

Preferably, the inductive chain elongation sensing thread count is greater than or equal to 1 in 25.4 mm (one inch), preferably greater than or equal to 10 for 25.4 mm, and less than or equal to 100 for 25.4 mm.

Preferably, the inductive elongation sensor yarn is arranged in the weft direction in the knitted textile piece, every one row of stitches on two rows of stitches every one row of stitches on ten rows of stitches, preferably every row of stitches. one row of stitches on two rows of stitches every one row of stitches on five rows of stitches.

In a variant, the conductive core of the electrically conductive covering wire has an electrical resistivity greater than or equal to 4 ohms / m.

Preferably, the electrical resistivity is less than or equal to 25 ohms / m, less than or equal to 10 ohms / m.

In one variant, the count of the electrically conductive covering wire is greater than or equal to 80 dtex, and less than or equal to 2000 dtex, preferably less than or equal to 500 dtex, in particular greater than or equal to 150 dtex.

In a variant, the diameter of each of the filament (s) of the electrically conductive covering wire has a substantially circular cross section whose diameter is greater than or equal to 25 μm, preferably greater than or equal to 50 μm, and less than or equal to 500 μm, preferably less than or equal to 100 μm, in particular of the order of 63 μm.

The electrically conductive covering yarn may comprise several filaments, for example between 2 and 10 filaments, in particular between 2 and 5 filaments.

In a variant, the bare elastic core yarn of the inductive elongation sensor yarn has a count greater than or equal to 250 dtex, preferably greater than or equal to 300 dtex, and less than or equal to 2000 dtex.

In one variant, the covering yarn C has a count greater than or equal to 5 dtex, and less than or equal to 700 dtex, preferably less than or equal to 250 dtex, in particular less than or equal to 100 dtex.

In one variant, the count of the inductive elongation sensor wire is greater than or equal to 150 dtex, preferably greater than or equal to 500 dtex, and less than or equal to 4000 dtex, preferably less than or equal to 3000 dtex, in particular greater or equal to 700 dtex and less than or equal to 2500 dtex.

Alternatively, the electrically conductive covering yarn is wrapped or twisted around the elastic core yarn in a first given direction, chosen from the S and Z directions, and the covering yarn C is wrapped or twisted around the electrically conductive covering thread in a second given direction, chosen from among the S and Z directions, the first direction of wrapping or twisting being opposite to the second direction of wrapping or twisting.,

The present invention relates, according to a second aspect, to the use of a device, according to any one of the variant embodiments with reference to a first aspect of the invention, for measuring the variation of the inductance (pHenry ) of the magnetic coil created by said inductive elongation sensor wire between two points A and B of the elastic textile piece in at least a first direction, between which extends said inductive elongation sensor wire, obtained during the elongation of the elastic textile piece in the first direction.

The present invention relates, according to a third aspect, to a method for measuring the variation of the inductance (pHenry) of a magnetic coil created by an inductive elongation sensor wire, comprising the following steps:

- (i) providing a device according to any one of the variant embodiments with reference to a first aspect of the invention;

- (ii) measuring the initial inductance value 10 (pHenry) of the elastic textile piece at rest in the first direction between two points A and B between which said at least one inductive elongation sensor wire extends;

- (iii) measure the inductance II value (pHenry) of the elastic textile part in a first state stretched between the two points A and B, in particular under an elongation of 20 mm, in the first direction;

- (iv) optionally measure the inductance value In of the elastic textile piece in an nth state stretched between the two points A and B, in particular under an elongation of 20 mm, in the first direction, n being a positive integer different from zero, the nth stretched state being different from the nth-1 stretched state;

- (v) recovering the variation in inductance (pHenry) by the difference between 10 (pHenry) and II (pHenry), which is preferably other than zero.

The inductance values can be measured using an LCR meter, in particular of type E4980A, in particular according to the following parameters: a sinusoid of frequency of 100 kHz and 1 volt of amplitude, the elongation sensor wire inductive is connected to the device using a pair of Kelvin clamps, device reference: 16089B from Keysight

Technologies. A first clamp is in electrical connection with the conductive part of the inductive elongation sensor wire at point A, and a second clamp is in electrical connection with the conductive part of the inductive elongation sensor wire at point B.

The variants, definitions, embodiments according to the first, second and third aspects can be combined independently with each other.

Description of figures

The present invention will be better understood on reading the exemplary embodiments cited without limitation, and illustrated by the following figures in which:

[Fig. 1] FIG. 1 is a schematic representation of a first example of a device, in particular a medical device, comprising a textile part according to the present invention which is a compression sock;

[Fig. 2] FIG. 2 schematically represents, viewed from its front face, a second example of a device, in particular a medical device, comprising several textile parts according to the invention, which is a lumbar support belt;

[Fig. 3] FIG. 3 diagrammatically represents, seen from its rear face, the second example of a device, in particular a medical device, shown in FIG. 2;

[Fig 4] FIG. 4 represents a first example of a stitch diagram of a knitted textile piece according to the invention;

[Fig 5] FIG. 5 shows a second example of a stitch diagram of a knitted textile piece according to the invention;

[Fig 6] FIG. 6 represents a third example of a stitch diagram of a textile piece knitted according to the invention; [Fig 7] FIG. 7 shows a fourth example of a stitch diagram of a knitted textile piece according to the invention;

[Fig 8] FIG. 8 schematically represents a first example of a weaving weave of a woven piece according to the invention;

[Fig 9] FIG. 9 schematically represents an example of an inductive elongation sensor wire according to the invention;

[Fig 10] Figure 10 shows schematically in cross section the electrically conductive cover wire of the inductive elongation sensor wire shown in Figure 9.

Detailed description of the invention

FIG. 1 represents a first example of a medical device 1, in particular a compression sock comprising an elastic textile piece knitted with a compressive effect 5 in at least a first direction, here in the transverse direction T. The sock 1 comprises a sensor yarn d 'inductive elongation 10 arranged in a circular manner between points A1 and B1 in the measuring zone zl, The measuring zone zl is arranged between regions 7 and 8 of the textile part 5 not comprising an inductive elongation sensor wire 10 The region z1 is here placed in the upper part of the sock 5 but could be placed in the intermediate part according to the zone z2 or else in the lower part according to the zone z3 or else in these three zones at the same time. The arrangement of the sensor wire 10 depends on the zone in which it is desired to evaluate the elastic behavior of the elastic part.

In this specific example, which can be generalized to any device comprising a tubular elastic textile part, the measurement zone zl comprises several turns in the sensor wire 10. It has been observed that the greater the number of turns, the greater the measured inductance. Student. Thus, for a number of turns of between 2 turns and 10 turns, the inductance measured between points A1 and B1 varies between 1 mH and 14 pH when the sock 5 is worn. The measured inductance also increases when the turns get closer, for example it is of the order of 3.3 pH when worn for 5 mm of spacing between two turns of sensor wire, while it is 4 pH for 1 mm spacing between two turns of sensor wire.

FIGS. 2 and 3 represent a second example of a medical device 20, in particular a lumbar support belt, comprising several elastic textile parts, in particular flat. The device 20 comprises a first side assembly 22 comprising the elastic woven textile pieces 24 and 26; a second side assembly 28 comprising the elastic woven textile pieces 30 and 32. The woven pieces 24 and 26 respectively comprise a longitudinal direction corresponding to the warp direction C1 and Cil; and a transverse direction corresponding to the weft direction Tl and Tll. Woven pieces 30 and 32

respectively comprise a longitudinal direction corresponding to the chain direction C2 and C22; and a transverse direction corresponding to the weft direction T2 and T22. The first elastic direction of each of the parts 24, 26, 30, 32 corresponds to their longitudinal direction or chain C1, Cil, C2, C22. The device 20 also comprises a first central assembly 34 comprising the woven textile pieces 36 and 38 which are elastic in their warp directions C3, C33, substantially perpendicular to their transverse directions T3, T33. The belt 20 comprises sections of inductive elongation sensor yarn, arranged in the textile piece 24 in the direction Cl between the points A2 and B2, in the textile piece 30 between the points A3 and B3 in the direction C2, in the piece textile 32 between the points A4 and B4 in the direction C22, in the textile piece 36 in the direction C33 between the points A5 and B5, and finally in the textile piece 26 between the points A6 and B6 in the Cil direction. All of these sections of inductive elongation sensor yarn 21 represent localized measurement zones adjacent to regions of these textile parts not including any inductive elongation sensor yarn 21.

FIGS. 4 to 7 represent different stitch diagrams which can be used, in combination or independently of one another, for the knitted textile piece 5 or any other knitted textile piece, in particular with a compressive effect, according to the invention.

Figures 4 and 5 show stitch diagrams which are implemented on a double needle bed flat knitting machine.

By definition, a stitch pattern is the smallest knitted repeat pattern of a knitted piece.

The stitch diagram 40 of FIG. 4 comprises a thread A of stitch 42, elastic or not, knitted in 1 * 2 rib; then an inductive elongation sensor wire 44 screened, and a wire B of mesh 46, elastic or not, identical or different to the wire A of mesh 42. The wire B of mesh 46 forms ribbed stitches in rib 1 * 2. The sensor thread 44 is inserted between the needles of the front and rear needle beds, in this specific example every one row of stitches over three rows of stitches. Two rows of meshes in the weft direction 45, adjacent i.e. as close as possible, each comprising an inductive elongation sensor wire 44, are spaced in the mesh diagram 40 by two rows of meshes in the weft direction 43 and 47.

The stitch diagram 50 of FIG. 5 comprises a thread A of stitch 52, elastic or not, knitted in 1 * 1 rib; then an inductive elongation sensor wire 44 screened, ie inserted between the Needles for the front and back needle beds in this specific example every one row of stitches over two rows of stitches.

Figures 6 and 7 show stitch patterns which are implemented on a single cylinder circular knitting machine.

The stitch diagram 60 of FIG. 6 comprises a thread A of stitch 62, elastic or not, knitted in stockinette stitch on every other needle; then an inductive elongation sensor yarn 64 forming stitches loaded every other needle, in synchronization with the purl stitches of yarn A 62. The yarn 64 forms stitches loaded every every other row of stitches.

The stitch diagram 70 of FIG. 7 comprises a thread A of stitch 72, elastic or not, knitted in reverse stockinette on all the needles; then a first inductive elongation sensor yarn 74 forming stitches loaded every other needle, then a stitch thread B 76, elastic or not, identical to or different from yarn A 72, knitted in purl stockinette stitch on all needles, and finally a second inductive elongation sensor wire 78, identical to or different from the first sensor wire 74, forming stitches loaded every other needle. In this stitch pattern 70, an inductive elongation sensor wire 74, 78 is present every second row of stitches. Two adjacent rows of weft-directional stitches ie as close as possible, each comprising an inductive elongation sensor yarn 74 and 78 respectively, are spaced on the stitch diagram 70 by one weft-directional rows of stitches comprising the yarn A 72 or wire B 78.

FIG. 8 represents an example of a weave weave 80 for the production of an elastic woven textile piece 85 which can be used for the textile pieces 24, 26, 30, 32, 36, 38.

The textile piece 85 comprises a warp direction C4 and a weft direction T4. The piece 85 is a double-sided warp fabric comprising a central layer 87 having a plurality of binder warp yarns 88 and a plurality of elastic warp yarns formed from an inductive elongation sensor yarn 89. The textile piece 85 comprises a outer layer 101 comprising binding warp yarns 104 and 106 woven with weft yarns 108 and 110, and the warp yarns 88 and 89 of the core layer 87 as well as the warp yarns 112 and 114 of the inner layer 116 The elongation sensor wire 89 is disposed in the central layer 87 and does not come into direct contact with the skin. The warp threads 88, 104, 106, 112 and 114 may be identical or different, and are of the type of the thread A according to the invention. The weft threads 108 and 110 can be identical or different, and are of the type of thread B according to the invention. The warp yarns 88, 104, 106, 112 and 114 preferably have a count (dtex) of the same order, for example have a count of the order of 312 dtex, are multifilament yarns, and in the same material, of preferably polyamide (6-6).

The weft threads 108 and 110 are each preferably a monofilament thread, in particular made of polyamide (6-6) or of polyester (polyethylene terephthalate), in particular having a diameter greater than or equal to 0.10 mm.

FIGS. 9 and 10 represent an example of an inductive elongation sensor wire 120 according to the invention comprising an elastic core wire 125 and a monofilament electrically conductive covering wire 130 forming turns 135 around said elastic core wire. 125. The electrically conductive cover wire 130 comprises an electrically conductive core 140 covered with a non-electrically conductive sheath 145. Preferably, the number of turns 135 or turns per meter of the conductive cover wire electricity 130 around the elastic core wire 125 is between 650 turns / m and 1660 turns / m (terminals included). The inductive elongation sensor wire 120 preferably also comprises a C 133 cover wire wrapped in a direction opposite to that imparted to the electrically conductive cover wire 130 in order to balance the inductive elongation sensor wire 120, and that 'it does not spin. The covering yarn This is in particular arranged around the assembly formed of the electrically conductive covering yarn 130 and of the elastic core yarn 125, so as to form an outer covering thus protecting the conductive covering yarn. electricity mechanically and during washing. The turns 135 formed by the electrically conductive covering wire 130 are not contiguous so that two turns 135 are spaced by a space e greater than 0 mm, in particular greater than or equal to 1 mm and less than or equal to 20 mm, more particularly less than or equal to 5 mm.

The monofilament electrically conductive covering thread 130 has a titer greater than or equal to 80 dtex, and less than or equal to 350 dtex. The electrically conductive cover wire 130 has a substantially circular cross section whose diameter d is greater than or equal to 25 µm, and less than or equal to 100 µm. In general, the diameter P of the conductive core 140 of the conductive covering wire 130 is greater than or equal to 70% of the diameter d (p> 70% * d), preferably greater than or equal to 80% of the diameter d, in particular greater than or equal to 90% of the diameter d. The bare elastic core thread 125 has a titer greater than or equal to 250 dtex and less than or equal to 2000 dtex. The covering thread C 133 has a count greater than or equal to 5 dtex, and less than or equal to 250 dtex. Finally, the count of the inductive elongation sensor wire 120 is greater than or equal to 150 dtex, and less than or equal to 4000 dtex. The cover wire C 133 forms turns in a direction opposite to the turns 135 formed by the conductive cover wire 130, which turns are shown over part of the length of the wire 120 for reasons of clarity, while they extend over the entire length of the latter.

In a specific embodiment, the inductive elongation sensor wire 120 has a count of the order of 2080 dtex, a bare elastic core wire 125 of elastane having a count of 1250 dtex, a conductive covering wire of the monofilament electricity 130 whose titer is 280 dtex, the conductive core 140 is made of copper and the electrically insulating sheath 145 is in a polyamide polymer (6-6). The diameter of the electrically conductive cover wire 130 is on the order of 63 µm. The number of turns / m, and therefore the number of turns per meter, in the electrically conductive covering wire 130 around the elastic core wire 125 is 1000 turns / m and the number of turns / m of the wire cover C 133 (in polyamide 78 dtex at 2 ends) is 870 turns / m in an S or Z direction opposite to that used for the electrically conductive cover wire 130. The elongation at break of the wire of bare core 125 is of the order of 440-450%. The elongation at break of the core wire 125 covered by the turns 135 in the electrically conductive cover wire 130 without the cover wire C 133, and the elongation of the inductive elongation sensor wire 120 are of the order by 190%.

In another specific embodiment, the inductive elongation sensor wire 120 has a count of the order of 1460 dtex, a bare elastic core wire 125 of elastane having a count of 1250 dtex, a conductive covering wire of electricity 130 whose titer is 280 dtex, the conductive core 140 is made of copper and the electrically insulating sheath 145 is in at least one polymer such as polyamide (6-6) or polyurethane. The diameter of the electrically conductive cover wire 130 is on the order of 63 µm. The number of turns / m, and therefore the number of turns 135 per meter, in the electrically conductive covering wire 130 around the elastic core wire 125 is 1660 turns / m and the number of turns / m of the cover yarn C 133 (in polyamide of 78 dtex at 2 ends) is 1400 turns / m in an S or Z direction opposite to that used for the electrically conductive covering yarn 130. The elongation at break of the yarn bare core 125 is less than or equal to 550%. The elongation at break of the core wire 125 covered by the turns 135 in the electrically conductive cover wire 130 (without cover wire C), and the elongation of the inductive elongation sensor wire 120 are around 190%. The inductance of this inductive elongation sensor wire 120 was measured using an LCR meter and a pair of Kelvin clamps (each clamp is electrically connected to points A and B in the inductive elongation sensor wire) , themselves connected to the device. The device is in particular that defined above in the description. [Table 1]

Table 1 above represents the inductance measurements in the upward and downward direction of elongation for the inductive elongation sensor wire 120 exemplified above of 1460 dtex, for a length of this inductive elongation sensor wire at rest 19 cm. The variation of inductance in absolute values between the 19 cm rest position and the stretched 20.8 cm position is 34.4 nH in the upward direction.

The measurement of the inductance advantageously makes it possible to quantify in a reliable manner, and this significantly, low elongations. These measurements were carried out directly on the inductive elongation sensor wire but could be carried out directly on the textile part between two points of the sensor wire in the elastic textile part.

Furthermore, the inductive elongation sensor wires exemplified in detail in the two preceding paragraphs can be implemented for the inductive elongation sensor wires 10, 21, 44, 64, 74, 78 or even 89 described above.

The zone (s) of a textile piece which is elastic in at least one direction and which does not include inductive elongation sensor wire (s) can have the same mesh or weaving pattern as that of the or zone (s) comprising at least one inductive elongation sensor wire of said textile piece, or a mesh or weaving pattern chosen from those described in the present text, in which said at least one inductive elongation sensor wire is then replaced by at least one elastic thread as described in this text.

Claims

1. Method for measuring the variation of the inductance (pHenry) of a coil

magnetic created by an inductive elongation sensor wire

(10,21,44,64,74,78,89,120), comprising the following steps:

- (i) provide a device (1,20) comprising at least one elastic textile piece

(5,24,26,30,32,36,38,85) in at least a first direction, the textile part

(5,24,26,30,32,36,38,85) includes at least one inductive elongation sensor wire

(10.21.44.64.74.78.89.120), said inductive elongation sensor wire

(10.21.44.64.74.78.89.120) comprising an elastic core wire (125) and an electrically conductive covering wire (130) forming turns (135) around said elastic core wire (125), and the Electrically conductive blanket yarn (130) comprises one or more filaments, each of said filament (s) comprising an electrically conductive core (140) covered with an electrically non-conductive sheath (145);

- (ii) measure the initial inductance value 10 (pHenry) of the elastic textile part

(5,24,26,30,32,36,38,85) at rest in the first direction between two points A and B between which extends said at least one inductive elongation sensor wire

(10.21.44.64.74.78.89.120);

- (iii) measure the inductance value II (pHenry) of the elastic textile part

(10.21.44.64.74.78.89.120) in a first state stretched between the two points A and B, in particular under an elongation of 20 mm, in the first direction;

- (iv) possibly measure the inductance value In of the elastic textile part

(10,21,44,64,74,78,89,120) in an nth state stretched between the two points A and B, in particular under an elongation of 20 mm, in the first direction, n being a positive integer different from zero, the nth stretched state being different from the nth-1 stretched state;

2. Method according to claim 1, characterized in that the turns (135) are not contiguous, the space e between two adjacent turns (135) being greater than 0 mm when the textile piece (5,24,26,30 , 32,36,38,85) is at rest.

3. Method according to either of claims 1 and 2, characterized in that said at least one elastic textile piece comprises at least one localized measurement zone of the inductance (mH) comprising said at least one sensor wire. of inductive elongation extending between said points A and B, said measurement zone being adjacent to at least one region of said elastic textile piece not comprising said inductive elongation sensor wire, in particular the surface of said measurement zone represents less than 50% of the total surface of said elastic textile piece.

4. Method according to any one of claims 1 to 3, characterized in that the number of turns (135) or turns per meter of the electrically conductive covering wire (130) around the elastic core wire (125) is greater than or equal to 150 revolutions / m and less than or equal to 2500 revolutions / m, in particular between 650 revolutions / m and 1660 revolutions / m.

5. Method according to any one of claims 1 to 4, characterized in that the inductive elongation sensor wire (10,21,44,64,74,78,89,120) comprises at least one cover wire C (133 ), especially inelastic.

6. Method according to claim 5, characterized in that the cover wire C (133) is arranged around the assembly formed of the electrically conductive cover wire (130) and the elastic core wire (125). , so as to form an outer cover.

7. Method according to any one of claims 1 to 6, characterized in that said at least one elastic textile piece is a woven textile piece (24, 26, 30, 32,

36, 38, 85), and the inductive elongation sensor wire is a warp wire (89,120).

8. Method according to any one of claims 1 to 6, characterized in that said at least one elastic textile piece is a knitted textile piece (5) and the inductive elongation sensor yarn is woven (44) and / or forms stitches loaded (64,74,78).

9. Method according to any one of claims 1 to 8, characterized in that the inductive elongation sensor wire (10,21,44,64,74,78,89,120) is disposed in said at least one elastic textile piece (5,24,26,30,32,36,38,85) so that:

- when the elastic textile piece is a knitted textile piece (5), two adjacent rows of stitches in the weft direction, each comprising an inductive elongation sensor yarn (44), are spaced apart by at least one row of stitches in the weft direction (43,57) not comprising an inductive elongation sensor wire (88,104,106,112,114); or

- When the elastic textile piece is a woven textile piece (89), two warp threads each comprising an inductive elongation sensor thread (89), either adjacent to or spaced apart by at least one intermediate warp thread not comprising no inductive elongation sensor wire (88,104,106,112,114).

10. Method according to any one of claims 1 to 9, characterized in that the count of the electrically conductive covering yarn (130) is greater than or equal to 80 dtex, and less than or equal to 2000 dtex.

11. Method according to any one of claims 1 to 10, characterized in that the diameter of each of the filament (s) of the electrically conductive covering wire (130) has a substantially circular cross section whose diameter. is greater than or equal to 25 μm, and less than or equal to 500 μm.

12. Method according to any one of claims 1 to 11, characterized in that the bare elastic core wire (125) of the inductive elongation sensor wire (120) has a titer greater than or equal to 250 dtex and less or equal to 2000 dtex.

13. The method of claim 5, characterized in that the cover yarn C (133) has a count greater than or equal to 5 dtex, and less than or equal to 700 dtex.

14. Method according to any one of claims 1 to 13, characterized in that the titer of the inductive elongation sensor wire (10,21,44,64,74,78,89,120) is greater than or equal to 150 dtex, and less than or equal to 4000 dtex.

15. The method of claim 5, characterized in that the cover wire

electrically conductive (130) is wrapped or twisted around the elastic core yarn (125) in a first given direction, selected from the S and Z directions, and the cover yarn C (133) is wrapped around the yarn electrically conductive blanket (130) in a second given direction, chosen from among the S and Z directions, the first direction of wrapping or twisting being opposite to the second direction of wrapping or twisting.

16. Use of a device (1,20) comprising at least one elastic textile piece

(5,24,26,30,32,36,38,85) in at least a first direction, the textile part

(5,24,26,30,32,36,38,85) includes at least one inductive elongation sensor wire

(10.21.44.64.74.78.89.120), said inductive elongation sensor wire

(10.21.44.64.74.78.89.120) comprising an elastic core wire (125) and an electrically conductive covering wire (130) forming turns (135) around said elastic core wire (125), and the Electrically conductive blanket yarn (130) comprises one or more filaments, each of said filament (s) comprising an electrically conductive core (140) covered with an electrically non-conductive sheath (145), to measuring the variation of the inductance (pHenry) of the magnetic coil created by said inductive elongation sensor wire

(10,21,44,64,74,78,89,120) between two points A and B of the elastic textile piece

(5,24,26,30,32,36,38,85) in at least a first direction, between which extends said inductive elongation sensor wire (10,21,44,64,74,78,89,120 ), obtained during the elongation of the elastic textile piece (5,24,26,30,32,36,38,85) in the first direction.