• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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    • 专利摘要:
    The present invention relates to a compressible layer (300), such as a mattress or a seat cushion, comprising: - at least one measuring electrode (106); and - at least one guard electrode (108) disposed facing said measuring electrode (106), said measurement electrodes (106) and guard (108) being set to an identical or substantially identical alternating potential (VG), said guard, at a given frequency, said working, different from a ground potential (M), and - at least one measuring module (114) of a signal relating to the capacitance (Ceo), called electrode- object formed between said measuring electrode (106) and a person (302) on said layer. It also relates to a bed or seat incorporating or equipped with such a capacitive layer in the form of a mattress or a cushion.
    公开号:FR3062207A1
    申请号:FR1750516
    申请日:2017-01-23
    公开日:2018-07-27
    发明作者:Didier Roziere
    申请人:Fogale Nanotech SA；
    IPC主号:
    专利说明:

    Holders): FOGALE NANOTECH SA.
    O Extension request (s):
    ® Agent (s): PONTET ALLANO & ASSOCIES.
    (54) COMPRESSIBLE LAYER WITH CAPACITIVE SENSORS.
    FR 3,062,207 - A1 (57) The present invention relates to a compressible layer (300), such as a mattress or a seat cushion, comprising:
    - at least one measuring electrode (106); and
    - at least one guard electrode (108) disposed opposite said measurement electrode (106), said measurement (106) and guard electrodes (108) being set to an identical or substantially identical alternating potential (Vq), called guard, at a given frequency, called the working frequency, different from a ground potential (M), and
    - At least one measurement module (114) of a signal relating to the capacitance (C eo ), called object-electrode, formed between said measurement electrode (106) and a person (302) being on said layer.
    It also relates to a bed or a seat incorporating, or equipped with, such a capacitive layer in the form of a mattress or a cushion.

    - 1 "Compressible layer with capacitive sensors"
    Technical area
    The present invention relates to a compressible layer, in particular a compressible capacitive layer which is in the form of a mattress intended to receive a person in the lying position or in the form of a seat cushion intended to receive a person in the sitting position, equipped with capacitive sensors.
    The field of the invention is, without limitation, that of instrumented compressible layers, such as mattresses or cushions, for furniture equipment such as beds, seats, etc.
    State of the art
    There are currently mattresses or cushions integrating various functions.
    Among these functions we find, for example, the possibility of adapting to the morphology of a person lying on the mattress.
    Another function consists in modifying the hardness of the mattress by modifying, for example the pressure of a fluid, such as air, being in the mattress. In this case, the mattress has a waterproof envelope and the user, or the manufacturer, changes the fluid pressure according to the desired comfort.
    However, there is currently no mattress or cushion making it possible to detect the position of a person lying on said mattress or cushion dynamically. However, such dynamic detection can be very useful, for example to carry out physiological monitoring of the person, or to adjust at least one characteristic of the mattress with a view, for example, to avoid the formation of bedsores or to avoid falling. of the person.
    An object of the present invention is to remedy the aforementioned drawbacks.
    Another object of the present invention is to provide a compressible layer, such as a mattress or a cushion, making it possible to dynamically detect a person lying in particular on said layer.
    Yet another object of the present invention is to provide a compressible layer, such as a mattress or a cushion, making it possible to more precisely detect a person lying on said layer.
    It is also another object of the present invention to provide a compressible layer, such as a mattress or a cushion, making it possible to carry out a monitoring of a person lying on said layer.
    Statement of the invention
    At least one of these aims is achieved with a compressible layer, in particular in the form of a mattress for receiving a person in a lying position or a seat cushion for receiving a person in a sitting position, and comprising:
    - at least one electrode, called a measurement electrode, which is located, in use, facing said person; and
    at least one electrode, called the guard electrode, placed opposite the said measurement electrode, the said measurement and guard electrodes being set to an identical or substantially identical alternating potential, called the guard, at at least one given frequency, called the work, different from a mass potential, and
    - At least one module for measuring a signal relating to the capacity, called the object-electrode, formed between said measurement electrode and said person.
    Thus, the layer according to the invention makes it possible to carry out, dynamically, a capacitive detection of a person lying on said layer, and in particular a person lying on said layer in the case of a mattress, or a seated person. on said layer in the case of an armchair, such as a wheelchair for example.
    By using this position, it is then possible to carry out a monitoring, in particular in time, of the person being on said layer. It is for example possible to carry out a monitoring of at least one parameter
    - 3 physiological relating to the person, to detect a risk of falling of the person, etc.
    In the present application, two alternative potentials are identical at a given frequency when they each comprise an alternative component identical to this frequency. Thus, at least one of the two potentials identical to said frequency may further comprise a DC component, and / or an AC component of frequency different from said given frequency.
    Similarly, two alternative potentials are different at the working frequency when they do not have an identical alternative component to this working frequency.
    According to one embodiment, the at least one measurement electrode can be located on the side of, or on, a face or a wall of the layer according to the invention, located, in use, on the side of the person.
    The measurement electrode can then deform under the weight of said person.
    According to another embodiment, the at least one measurement electrode can be located on the side of, or on, a face or a wall of the layer according to the invention, located, in use, on the side opposite the person.
    The measurement electrode may for example be on a rigid plane, such as for example a support of the layer, which constitutes a reference plane for the measurements carried out with the measurement electrode.
    Preferably, the layer according to the invention may comprise several measurement electrodes distributed in the plane of the layer, over all or part of said layer
    In this case, a guard electrode may be common to at least two, in particular all of the measurement electrodes, said common guard electrode forming in particular a common guard plane.
    - 4 Alternatively, or in addition, the layer according to the invention may comprise at least one individual guard electrode associated with at least one, in particular each, measurement electrode.
    Furthermore, the layer according to the invention may comprise, or be associated with, a calculation module arranged to calculate the electrode-object capacity for each measurement electrode, as a function of the signal measured.
    The calculation of the electrode-object capacity can be carried out as a function of the measured signal, or as a function of a digitized version of said measured signal, or of another digital or analog signal deduced from said measured signal, for example by filtering said measured signal at the working frequency.
    The layer according to the invention can also comprise, or be associated with, at least one calculation module configured to determine a distance between the person and each measurement electrode as a function of the measured signal, or of the electrode-object capacity.
    This calculation module can, for example, be the module for calculating the electrode-object capacity, or another calculation module.
    The at least one calculation module can determine said distance by calculation or by comparison with a previously established reference table, of the measured signal, possibly previously digitized and / or processed, or of the electrode-object capacity.
    The at least one calculation module can determine said distance directly as a function of the measured signal, possibly previously digitized and / or processed, or of the electrode-object capacity, using a relation previously informed.
    Advantageously, the layer according to the invention can comprise a dielectric. Such a dielectric can in particular comprise:
    - a dielectric fluid, which can be gaseous, such as air, or liquid, such as oil;
    - a dielectric polymer, such as a silicone-based polymer; or
    - a dielectric foam, such as a polyester foam.
    The layer can be transparent. For this purpose, it can be produced, for example, in transparent flexible plastic or in PolyDiMethylSiloxane (or PDMS) comprising a dielectric, itself transparent.
    According to one embodiment, the layer according to the invention can comprise, or can be formed by, a single cell.
    This single cell can be delimited by a sealed envelope, in particular when the layer comprises a dielectric fluid.
    This single cell can be delimited by an electrically non-conductive envelope.
    This single cell can be delimited by a transparent envelope.
    Preferably, the compressibility of the single cell can be adjustable. In this case, the layer according to the invention can also comprise means for adjusting said compressibility, as a function of the signal measured for at least one, in particular each, measurement electrode.
    Such an adjustment can be made to satisfy a choice of comfort.
    Such an adjustment can be made to adjust the distance between the body of a person lying on said layer and a predetermined surface, such as a hard surface on which said layer is placed, in order for example to avoid contact between said body and said hard surface to avoid the appearance of bedsores which may be caused by such contact, and / or optimize the comfort of the person.
    In particular, in the case where the single cell comprises a dielectric fluid, the adjustment of the compressibility of the single cell may comprise an adjustment of the pressure of said fluid in said single cell. In this case, the means for adjusting the compressibility may comprise a means for adjusting the pressure of said fluid in said single cell, such as a pump for example.
    According to another embodiment, the layer according to the invention can comprise, or is formed by, several cells, in particular adjacent, and in particular individually compressible.
    In this embodiment, the layer according to the invention can comprise:
    - for at least one cell, at least one measuring electrode individual to said cell; and or
    - a measurement electrode common to several adjacent cells, in particular to all cells.
    According to the invention, the compressibility of at least one cell can be adjustable:
    - individually and independently of the other cells; or
    - in common for:
    all the cells of said layer, or a group comprising at least two cells.
    In this case, the layer may further comprise means for adjusting said compressibility, as a function of the signal measured for at least one, in particular each, measurement electrode.
    The layer according to the invention can in particular comprise a means of adjustment:
    - individual for at least one, in particular each, cell; or
    - common to:
    all the cells of said layer, or a group comprising at least two cells
    In particular, in the case where one, respectively each, cell comprises a dielectric fluid, the adjustment of the compressibility of said cell may comprise an adjustment of the pressure of the dielectric fluid being in said cell.
    In this case, the means for adjusting the compressibility of the cell may comprise a means for adjusting the pressure of said fluid in said cell, such as a pump for example.
    - 7 According to a first embodiment, the compressibility of all the cells or of a group of cells can be adjusted in a common manner as a function of the signal measured for at least one, in particular each, cell.
    In this case, the adjustment means can be a means for adjusting the pressure of said fluid in all the cells or in the group of cells, in common, such as a pump for example.
    The cells can be communicating with each other. In this case, the layer according to the invention may comprise a single valve, or opening, for injecting / removing dielectric fluid into / from all the cells in order to adjust, in a common manner, the compressibility of all the cells or of all the cells. of the group.
    The cells can be non-communicating with each other. In this case, each cell may include a valve, or opening, for injecting / removing dielectric fluid into / from said cell, to adjust the compressibility of said cell.
    Alternatively, the compressibility of at least one, in particular of each, cell can be adjusted individually, independently of the other cells.
    In this case, the means for adjusting the compressibility of a cell may comprise means for adjusting the pressure of the dielectric fluid in said cell, individually, such as a pump dedicated to said cell for example.
    In this case, each cell may include a valve, or opening, for injecting / removing dielectric fluid into / from said cell, individually and independently of the other cells.
    According to a particularly advantageous characteristic, the layer according to the invention can comprise, or be associated with, an analysis means or module arranged so as to perform as a function of the signals measured for several, in particular all, measurement electrodes , a map of the body of a person lying, or sitting, on said layer.
    In particular, it is possible to determine at least one point, or zone, of local pressure (e) as a function of the signals measured for several, in particular all, measurement electrodes.
    - 8 According to another advantageous characteristic, the layer according to the invention may comprise, or be associated with, an analysis means or module arranged so as to perform as a function of the signals measured for several, in particular all, the electrodes of measure at least one of the following:
    - a measurement of the position of the person's body on said layer;
    - monitoring the movement, over time, of the person's body on said layer;
    - Detection of a risk of falling or of falling of the body of the person from said layer.
    Without limitation, such monitoring can be used to:
    - monitor sleep,
    - trigger a fall alert, for example when the person gets too close to an edge of the detection layer; and or
    - trigger a health alert, for example when no movement is detected for a predetermined period.
    in particular, by monitoring over time the signals measured for at least one, in particular several, measurement electrodes.
    According to another advantageous characteristic, the layer according to the invention may comprise, or be associated with, an analysis means or module arranged so as to perform as a function of the signals measured for several, in particular all, the measurement electrodes, monitoring of at least one physiological parameter of the person's body. This monitoring can be carried out by monitoring over time the signals measured for at least one, in particular several, measurement electrodes.
    Such monitoring may consist of monitoring of a breathing frequency, heartbeat, etc. as a function of a variation in distance measured by several measuring electrodes.
    The measurement of physiological parameter can make it possible to detect an abnormal situation of the person and trigger for example an alarm and / or a mechanical action for example a vibration at the level of the mattress
    - 9 or the cushion, or any support in direct or indirect contact with the person to make him react (vibration of the head for awakening, cardiac massage ....)
    According to another advantageous characteristic, the layer according to the invention can also comprise, or be associated with, an analysis means or module arranged so as to carry out as a function of the signals measured for several, in particular all, the electrodes of measurement, detection of a liquid substance, for example to detect incontinence. Indeed, the capacitive measurement electrodes are sensitive to the presence of liquid on the detection layer. Consequently, the signals measured for the measurement electrodes make it possible to detect the presence of liquid on the detection layer.
    The detection can exploit an evolution of the surface detected by the sensors by taking into account for example the zone (at the level of the basin for urine, at the level of the head for vomiting ...) of this evolution and its temporal aspect. .
    In a particularly advantageous version, the layer according to the invention can also comprise at least one electrode, called the polarization electrode:
    - arranged opposite the face of said layer being, in use, on the side of said person, and
    - setting to ground potential so as to polarize, by capacitive effect, a person on the side of said face.
    Thus, when the coupling between the person to be detected and the ground potential is degraded, or cut, this polarization electrode makes it possible to bring the person back to the ground potential or to bring it closer, so as to preserve the sensitivity and the performance. detection, with measuring electrodes.
    The layer may include an individual bias electrode for at least one, in particular, each measurement electrode.
    The layer may comprise a polarization electrode common to several, in particular to all the measurement electrodes, in particular forming a plane of polarization.
    - 10 At least one polarization electrode can be placed under, or at the same level as, the guard electrode (s).
    At least one polarization electrode can be perforated so that a guard electrode is arranged in the perforated part of said polarization electrode.
    At least one polarization electrode can be inserted between two adjacent guard electrodes, at the same level as said guard electrodes.
    The layer according to the invention can comprise a number of polarization electrodes identical, or different, from the number of measurement electrodes.
    According to embodiments, the device according to the invention can comprise at least one polarization electrode disposed at the same level as the measurement electrode (s).
    According to embodiments, the device according to the invention can comprise switching means making it possible to connect the measurement electrodes either to the input of the measurement module (active electrode), or to the guard potential.
    Thus, a measurement module can be used to sequentially interrogate a plurality of measurement electrodes.
    According to embodiments, the device according to the invention can comprise switching means making it possible moreover to switch measurement electrodes into polarization electrodes.
    In this case, the device according to the invention may comprise switching means making it possible to connect the measurement electrodes respectively, either to the input of the measurement module (active electrode), either to the guard, or to ground.
    In particular, it is possible to create measurement, guard and polarization electrode areas. These areas can be moved by switching each measuring electrode.
    In particular, it is more advisable to separate the polarization electrodes from the active measurement electrode (s) with guard electrodes in order to minimize the coupling between the polarization and measurement electrodes.
    - It The detection layer according to the invention can be integrated into a support or furniture equipment such as a table, a seat, an armchair, or a stretcher.
    Alternatively, the detection layer may be independent of the support, or of the movable equipment, and attached to said support or of the movable equipment, in particular detachably.
    In no way limiting, the layer according to the invention can be in the form:
    -a mattress, for example a mattress fitted to a bed, a table, a stretcher, etc. ; or
    -a cushion, for example a cushion to equip a seat, a chair, an armchair, a wheelchair, etc.
    According to yet another aspect of the invention, equipment is provided provided with a detection layer according to the invention.
    Such equipment can be furniture to receive a person in a seated position, such as a seat, or an armchair, in particular a wheelchair.
    Such equipment can be furniture for accommodating a person in a lying position, such as a bed, an operating table, a medical imaging table or even a stretcher.
    Description of the figures and embodiments
    Other advantages and characteristics will appear on examining the detailed description of nonlimiting examples, and the appended drawings in which:
    - FIGURE 1 is a schematic representation of the electrical principle of a first non-limiting example of a capacitive detection device which can be implemented in a layer according to;
    - FIGURE 2 is a schematic representation of the electrical principle of a second non-limiting example of a capacitive detection device which can be implemented in a layer according to;
    - FIGURE 3 a schematic representation of a first non-limiting embodiment of a layer according to the invention;
    - FIGURE 4 a schematic representation of a second non-limiting embodiment of a layer according to the invention; and
    - FIGURES 5-6 are configurations of electrodes which can be used in a layer according to the invention.
    It is understood that the embodiments which will be described below are in no way limiting. It is possible in particular to imagine variants of the invention comprising only a selection of characteristics described hereinafter isolated from the other characteristics described, if this selection of characteristics is sufficient to confer a technical advantage or to differentiate the invention from the prior art. This selection comprises at least one characteristic, preferably functional, without structural details, or with only part of the structural details if this part only is sufficient to confer a technical advantage or to differentiate the invention from the state of the prior art.
    In particular, all the variants and all the embodiments described can be combined with one another if nothing is technically opposed to this combination.
    In the figures, the elements common to several figures keep the same reference.
    FIGURE 1 is a schematic representation of the electrical principle of a first non-limiting example of a capacitive detection device which can be implemented in a layer according to the invention.
    The device 100, shown in FIGURE 1, makes it possible to detect the approach and the contact of an object 102 with respect to a detection surface 104. In the case of the present application, such an object 102 is a part or the whole body of a person, as described below with reference to FIGURES 3 and 4.
    - 13 The device 100 comprises at least one electrode 106, called the measurement electrode, disposed facing the detection surface 104, and therefore the object 102 approaching said surface 104, and an electrode 108, called the guard electrode, disposed facing the measuring electrode 106, below and at a distance from the measuring electrode 106.
    The device 100 further comprises a charge amplifier formed by an operational amplifier (AO) 110, the output of which is looped to its negative input by an impedance 112, which can be a capacitor or a capacitor associated with a resistor. In the example shown, the impedance 112 is formed by a capacitor C.
    A module 114, digital or analog, connected to the output of the AO 110, measures an electrical voltage, noted V s , on the output of the AO 110, at a predetermined working frequency.
    The device 100 further comprises an electrical source E, called the guard, supplying an alternating potential, called the guard, denoted V g , different from an electrical mass, denoted M, at the working frequency.
    In the example shown in FIGURE 1:
    the measurement electrode 106 is connected to the negative input of the AO 110, and
    - the guard electrode 108 is connected to the positive input of the AO; and
    - the electrical source E is connected to the positive input of the AO 110.
    In this configuration, the measurement electrode 106 and the guard electrode 108 are at the same alternating potential (or substantially at the same potential) Vg, supplied by the source E.
    Thus, the guard electrode 108 protects the measurement electrode 106 from parasitic capacitive couplings with the environment and prevents the appearance of leakage capacitors.
    In addition, the detection electronics and in particular the AO 110 are preferably supplied by a supply referenced to the guard potential V g , in order to avoid leakage capacitances at the electronics level.
    Alternatively, of course, the detection electronics and in particular the AO 110 can be supplied by a supply referenced to ground potential.
    The voltage V s , measured by the measurement module 114, is proportional to the capacitance C eo , called the electrode-object, formed between the electrode
    - 14 of measurement 106 and object 102. In particular, the voltage V s measured verifies the following relationship:
    K = E c -f (1)
    Thus, it is possible to deduce the capacitance C eo from the signal V s measured.
    In addition, the capacitance C eo is a direct function of the distance separating the object 102 from the measurement electrode 106, and therefore of the insertion of the object 102 into the detection surface 104. Consequently, it is possible to deduce the distance between the object 102 and the measurement electrode 106 as a function of the value of the capacitance C eo , and more generally as a function of the signal V s .
    For a plurality of measurement electrodes 106, it is thus possible to obtain a three-dimensional representation of the shape of the object and of its distance relative to each of these measurement electrodes 106.
    The measurement module 114 can calculate the capacitance C eo as a function of the signal that it measures, or of a digitized version of said signal.
    In addition, the device 100 comprises a switch 116 enabling the measurement electrode 106 to be connected:
    or at the negative input of the AO: in this case, the measurement electrode 106 is said to be “active” and makes it possible to measure a signal relating to the capacitance C eo ;
    -or to the guard potential V g , present for example at the positive input of the AO: in this case, the measurement electrode 106 is connected to the same guard potential V g as the guard electrode 108 and becomes a guard electrode.
    Thus, it is possible to sequentially interrogate a plurality of measurement electrodes.
    FIGURE 2 is a schematic representation of the electrical principle of a second non-limiting example of a capacitive detection device which can be implemented in a layer according to the invention.
    - The device 200, shown in FIGURE 2, includes all the elements of the device 100 in FIGURE 1.
    The device 200 comprises, in addition to the device 100, another electrode 202, called the bias electrode. The polarization electrode 202 is connected to the electrical ground M and makes it possible to polarize the object 102 with the ground potential M, so as to preserve the sensitivity and the detection performance of the device 100, when the coupling between the object 102 and the ground potential M is degraded or cut. Such a situation can occur when the object 102 is only in contact with the detection surface 104, or when the object 102 has no direct or indirect contact with the ground, other than through the detection surface 104. A such a situation occurs when a person is lying / sitting on the detection surface, without any contact with the ground, or the earth or the mass.
    In the example shown, the polarization electrode 202 is perforated and the guard electrode 108 is arranged in the perforated part of the polarization electrode 202, without contact with said polarization electrode 202. Thus, the electrode polarization 202 and the guard electrode 108 are arranged at the same level.
    The polarization electrode 202 is larger than the guard electrode 108, itself preferably larger than the measurement electrode 106.
    According to an alternative embodiment, the polarization electrode 202 can be placed under the guard electrode 108, which is in this case perforated to allow capacitive coupling between the polarization electrode and the object.
    According to an alternative embodiment, the bias electrode 202 can be inserted between two adjacent guard electrodes.
    According to another alternative embodiment, the polarization electrode 202 can be inserted between measurement electrodes 106, in the same plane as these measurement electrodes.
    FIGURE 3 is a schematic representation of a first non-limiting embodiment of a layer according to the invention.
    The layer 300 shown in FIGURE 3 is in the form of a mattress implementing the detection device 100 of FIGURE 1.
    - The mattress 300 is designed to receive a body 302 of a person on the side of a face 304, called the upper face, forming the detection surface, in a manner similar to the detection surface 104 of FIGURE 1.
    The mattress 300 is formed by a sealed envelope 306, swollen with air. It comprises a plurality of measurement electrodes 106i-106 n arranged in the thickness of the mat 300, at a distance from the upper wall 308, and opposite said top wall 308.
    The mattress 300 includes a single guard electrode 108 form a common care plan for all measuring electrodes 106i-106 n.
    The measurement electrodes 106i-106 n and the single guard electrode 108 are arranged integral with the lower wall 310, opposite the upper wall 308.
    The mattress 300 comprises, or is associated with, an analysis module 312. This analysis module 312 is connected to each measurement module 114i-114 n , associated with each measurement electrode, respectively 106i-106 n . The analysis module 312 receives from each measurement module 114,
    - the signal measured for the measurement electrode 106 ,, and / or
    the electrode-object capacity C eo , i determined for said measurement electrode, or else
    - The distance between each measurement electrode 106, and the part of the body 302 opposite the measurement electrode 106 ,.
    In addition, the mattress 300 comprises, or is associated with, a means 314 for adjusting the air pressure in the envelope 306 so as to adjust the compressibility of said mattress 300. Such a means 314 for adjusting the pressure air can be a pump connected to the casing 306 by a conduit, or a pump integrated into the mattress 300 and injecting / removing air from the air in / of the casing 306.
    By modifying the air pressure in the mattress 300 it is possible to adjust the distance between the body 302 and the measurement electrodes 106i-106 n to prevent the body 302 from coming into contact with a rigid support 316, on which the mattress 300 is arranged. This improves the comfort of the person, but also prevents the appearance of bedsores.
    - 17 The adjustment means 314 is connected to the analysis module 312. The latter sends instructions to the adjustment means 314 to modify the pressure in the casing 306 as a function:
    - signals measured by the measurement modules 114i-114 n ; and or
    - electrode-object capacitances C eo , i- C eo , N, and / or
    -the distance between the measuring electrodes 106i-106 n and the body 302.
    The analysis module 112 can also be configured to carry out at least one of the following operations:
    -determine a map of the body 302 lying on the mattress 300,
    - follow the movement of the body 302 over time,
    - detect a likely fall of body 302,
    -determine a physiological parameter, such as a respiration rate, a heart rate, etc.
    depending:
    - signals measured by the measurement modules 114i-114 n ; and or
    - electrode-object capacitances C eo , i-Ceo, N; and or
    -the distance between the measuring electrodes 106i-106 n and the body 302;
    and possibly their evolution over time.
    FIGURE 4 is a schematic representation of a second non-limiting embodiment of a layer according to the invention.
    The layer 400, shown in FIGURE 4, is in the form of a mattress comprising all the elements of the mattress 300 of FIGURE 3.
    The mattress 400 differs from the mattress 300 in that it comprises a plurality of cells, in particular N cells 402i_402 n , swollen with air. Each cell 402 is compressible individually and independently of the other cells.
    A measurement electrode 106, is associated with each cell 402 ,.
    - 18 The compressibility of the 402i-402 n cells can be adjusted in common by the pump 314.
    According to an alternative embodiment, (not shown) the compressibility of each cell 402, can be adjusted by an individual pump (not shown) associated with said cell 402,.
    According to an alternative embodiment, (not shown) the compressibility of a plurality of cells 402i-402 n constituting a group of cells can be adjusted by an individual pump (not shown) associated with said group of cells. In this case, the layer according to the invention may comprise a plurality of pumps which each control the pressure of a group of cells.
    In the examples described with reference to FIGURES 3 and 4, the mattresses 300 and 400 use the detection device of FIGURE 1. According to alternative embodiments, the mattresses 300 and 400 can use the detection device 200 of FIGURE 2.
    FIGURE 5 is a schematic representation of an electrode configuration that can be implemented in a layer according to the invention, and in particular in mattresses 300 and 400.
    Configuration 500, shown in FIGURE 5, includes a plurality of measurement electrodes 106i-106 n are used. For each measuring electrode 106i-106 n , the device comprises an individual guard electrode, respectively 108i-108 n , instead of a single guard electrode.
    Optionally, it is also possible to use:
    - a single polarization electrode, or
    -individual polarization electrodes.
    FIGURE 6 is a schematic representation of an electrode configuration that can be implemented in a layer according to the invention.
    - 19 Configuration 600, shown in FIGURE 6, includes a matrix of M rows and N columns of measurement electrodes 106,, j with 1 <i <M and l <j <N, distributed in the plane of the mattress 300 or 400. For each measurement electrode, respectively 106i, i-106 m , n, the device comprises: - an individual guard electrode, respectively 108i, i-108 m , n;
    and
    - optionally, an individual bias electrode, respectively 202i, i-202 m , n ·
    Each polarization electrode 202,, j is perforated and each guard electrode 108,, j is arranged in the perforated part of the polarization electrode 202,, j, at the same level as said polarization electrode 202,, j.
    According to an alternative configuration, the polarization electrodes 202i, i-202 m , n can be joined to form a single plane, called the polarization plane.
    According to yet another alternative, the polarization electrodes can be replaced by polarization lines, perpendicular to each other, and arranged between the guard electrodes 108,, j.
    According to yet another alternative, the polarization electrodes can be replaced by polarization lines, perpendicular to each other, and arranged between the measurement electrodes 106,, j.
    All the examples which have just been described relate to a mattress. Of course, the layer according to the invention can also be a cushion, in particular a cushion for a wheelchair.
    Of course, the invention is not limited to the examples which have just been described and numerous modifications can be made to these examples without departing from the scope of the invention.
    权利要求:
    Claims (17)
    [1" id="c-fr-0001]
    1. Compressible layer (300; 400), in particular in the form of a mattress for receiving a person (302) in a lying position or a seat cushion for receiving a person in a sitting position, and comprising:
    - At least one electrode (106), called a measurement electrode, which is located, in use, facing said person (302); and
    - at least one electrode (108), called the guard electrode, placed opposite said measurement electrode (106), said measurement (106) and guard electrodes (108) being set to an identical or substantially identical alternating potential (V G ), called guard, at at least one given frequency, called working, different from a ground potential (M), and
    - At least one measurement module (114) of a signal relating to the capacitance (C eo ), said object-electrode, formed between said measurement electrode (106) and said person (302).
    [2" id="c-fr-0002]
    2. Layer according to the preceding claim, characterized in that the at least one measuring electrode (106) is located on the side of, or on, a face or a wall (308) of said layer, located, in use, of the side of the person.
    [3" id="c-fr-0003]
    3. Layer (300; 400) according to claim 1, characterized in that the at least one measurement electrode (106) is located on the side of, or on, a face or a wall (310) of said layer (300 ; 400), located, in use, on the side opposite the person (302).
    [4" id="c-fr-0004]
    4. Layer (300; 400) according to any one of the preceding claims, characterized in that it comprises several measurement electrodes (106i106 n ) distributed in the plane of the layer (300; 400), on all or part of said layer (300; 400), a guard electrode (108) being common to at least two, in particular all, measurement electrodes (106i-106 n ), said common guard electrode (108) forming in particular a plane of joint custody.
    [5" id="c-fr-0005]
    5. Layer (300; 400) according to any one of the preceding claims, characterized in that it comprises several measurement electrodes (106i106 n ) distributed in the plane of the layer (300; 400), over all or part of said layer (300; 400), an individual guard electrode being associated with at least one, in particular each, measurement electrode (106i-106 n ).
    [6" id="c-fr-0006]
    6. Layer (300; 400) according to any one of the preceding claims, characterized in that it comprises a calculation means (114) arranged to calculate the electrode-object capacity (C eo ) for each measurement electrode (106 ), depending on the measured signal (V s ).
    [7" id="c-fr-0007]
    7. Layer (300; 400) according to any one of the preceding claims, characterized in that it comprises a dielectric, in particular:
    - a dielectric fluid;
    - a dielectric polymer, such as a silicone-based polymer; or
    - a dielectric foam, such as a polyester foam.
    [8" id="c-fr-0008]
    8. Layer (300) according to any one of the preceding claims, characterized in that it comprises, or is formed by, a single cell (306).
    [9" id="c-fr-0009]
    9. Layer (300) according to the preceding claim, characterized in that the compressibility of the single cell (306) is adjustable, said layer comprising (300) furthermore means for adjusting (314) said compressibility, depending of the measured signal (V s ) for at least one, in particular each, measurement electrode (106).
    [10" id="c-fr-0010]
    10. Layer (400) according to any one of claims 1 to 7, characterized in that it comprises, or is formed by, several cells (402i-402 n ), each cell (402,) being individually compressible, said layer (400) comprising:
    - for at least one cell (402,) at least one measuring electrode (106,) individual to said cell; and or
    - 22 - at least one measurement electrode common to several adjacent cells, and in particular to all the cells (402,).
    [11" id="c-fr-0011]
    11. Layer (400) according to the preceding claim, characterized in that the compressibility of at least one cell (402,) is adjustable:
    - individually and independently of the other cells (402,); or
    - in common for:
    - all of the cells of said layer (400), or
    - a group comprising at least two cells.
    [12" id="c-fr-0012]
    12. Layer (300; 400) according to any one of claims 8 to 11, characterized in that it comprises a means for adjusting (314) the compressibility of a cell (306; 402i-402 n ) by adjusting the pressure of a dielectric fluid present in said cell (306; 402i-402 n ).
    [13" id="c-fr-0013]
    13. Layer (300; 400) according to any one of the preceding claims, characterized in that it comprises an analysis module (312) arranged so as to carry out, as a function of the signals measured for several, in particular all the , measuring electrodes (106), at least one of the following operations:
    - a mapping of the body of the person (302) lying, or sitting, on said layer (300; 400);
    - a measurement of the position of the person's body (302) on said layer (300; 400);
    - monitoring the movement, over time, of the person's body (302) on said layer (300; 400);
    - Detecting a risk of falling or falling of the person's body (302) from said layer (300; 400);
    - monitoring of at least one physiological parameter of the person's body (302);
    - detection of a liquid substance.
    [14" id="c-fr-0014]
    14. Layer according to any one of the preceding claims, characterized in that it further comprises at least one electrode (202), known as of polarization:
    - arranged opposite the face of said layer being, in
    5 use, on the person's side, and
    - setting to ground potential (M) so as to polarize, by capacitive effect, a person on the side of said face.
    [15" id="c-fr-0015]
    15. Layer (300; 400) according to any one of the preceding claims,
    10 characterized in that it is in the form:
    - a mattress, or
    - a seat cushion.
    [16" id="c-fr-0016]
    16. Seat, in particular wheelchair, fitted with a layer according to any one of claims 1 to 14.
    [17" id="c-fr-0017]
    17. Bed fitted with a layer (300; 400) according to any one of claims 1 to 14.
    1/3
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    同族专利:
    公开号 | 公开日
    WO2018134082A1|2018-07-26|
    FR3062207B1|2019-03-22|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO1999044179A1|1998-02-27|1999-09-02|Hill-Rom, Inc.|Bed exit detection apparatus|
    EP2394623A1|2010-01-27|2011-12-14|Tokai Rubber Industries, Ltd.|Body position/body pressure control device|
    JP3167561U|2011-02-16|2011-04-28|亀岡電子株式会社|Body movement state monitoring sensor device|EP3769684A1|2019-07-23|2021-01-27|Winncare France|System and method for detecting incontinence in bedridden persons|
    EP3769676A1|2019-07-23|2021-01-27|Winncare France|System and method for detecting the presence of bedridden persons|
    CN111879455B|2020-07-24|2022-02-11|重庆火后草科技有限公司|Pressure sensor for bed|
    法律状态:
    2018-01-26| PLFP| Fee payment|Year of fee payment: 2 |
    2018-07-27| PLSC| Publication of the preliminary search report|Effective date: 20180727 |
    2020-01-28| PLFP| Fee payment|Year of fee payment: 4 |
    2021-01-28| PLFP| Fee payment|Year of fee payment: 5 |
    2022-01-28| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1750516|2017-01-23|
    FR1750516A|FR3062207B1|2017-01-23|2017-01-23|COMPRESSIBLE LAYER WITH CAPACITIVE SENSORS|FR1750516A| FR3062207B1|2017-01-23|2017-01-23|COMPRESSIBLE LAYER WITH CAPACITIVE SENSORS|
    PCT/EP2018/050445| WO2018134082A1|2017-01-23|2018-01-09|Compressible layer with capacitive sensors|
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