WO2015102085A1 - Dispositif de détermination de moment de changement d'article absorbant et procédé de détermination de moment de changement d'article absorbant - Google Patents

Dispositif de détermination de moment de changement d'article absorbant et procédé de détermination de moment de changement d'article absorbant Download PDF

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Publication number
WO2015102085A1
WO2015102085A1 PCT/JP2014/084269 JP2014084269W WO2015102085A1 WO 2015102085 A1 WO2015102085 A1 WO 2015102085A1 JP 2014084269 W JP2014084269 W JP 2014084269W WO 2015102085 A1 WO2015102085 A1 WO 2015102085A1
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WIPO (PCT)
Prior art keywords
absorbent article
impedance
excretion
timing determination
urine
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PCT/JP2014/084269
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English (en)
Japanese (ja)
Inventor
有里 今村
和田　一郎
利彦 上西
謙一 飛岡
厚生 中村
賢治 今
Original Assignee
ユニ・チャーム株式会社
大日本印刷株式会社
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Publication of WO2015102085A1 publication Critical patent/WO2015102085A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/42—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators with wetness indicator or alarm
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/42—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators with wetness indicator or alarm
    • A61F2013/424—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators with wetness indicator or alarm having an electronic device

Definitions

  • the present invention relates to an absorbent article replacement timing determination apparatus and an absorbent article replacement timing determination method.
  • disposable diapers have been used as absorbent articles that absorb excrement such as urine.
  • disposable diapers with an excretion detection function are also provided in the market by detecting and notifying the excretion of urine and the like.
  • Patent Document 1 discloses an absorbent article provided with a plurality of conductive contact terminals provided at predetermined intervals in the longitudinal direction of the absorber.
  • the impedance between the terminals changes, and the absorbent is wetted by analyzing the impedance obtained from the associated measurement unit and analysis unit. It is possible to grasp information such as range.
  • Patent Document 2 discloses an absorbent article having a moisture sensor provided with a pair of electrodes made of a water-soluble carbon ink. In such a moisture sensor, the electrode is normally electrically insulated, but when it is electrically connected by urination to be in a conductive state, conduction can be detected via the connector and a warning can be issued.
  • Patent Document 1 Although it is possible to detect information about the range where urine is excreted, it is not possible to detect the amount of absorption of urine by the absorber. Moreover, in the invention of Patent Document 2, although it is possible to detect that urine is excreted itself, it was not possible to detect the amount of absorption of urine by the absorber. Therefore, even if urine or the like is excreted, it can not be determined whether or not the absorber has exceeded the absorbable amount, and by continuing to use the absorber exceeding the absorption amount without replacing it. There was a risk that urine would overflow from the absorber and leak out.
  • the present invention has been made in view of the problems as described above, and an object thereof is to grasp an appropriate replacement timing in an absorbent article receiving excrement.
  • the main inventions for achieving the above object are an absorbent core provided in an absorbent article and absorbing excrement, a pair of conductive members provided in the absorbent article and having conductivity, and the conductive member Detecting the presence or absence of excretion on the basis of a detection unit that detects the magnitude of the impedance between the two, and the change pattern according to the passage of time of the impedance detected by the detection unit; And a control unit that determines the timing of replacing the absorbent article by comparing the magnitude of the impedance with a predetermined threshold value.
  • FIG. 1A is a schematic plan view of the diaper 101
  • FIG. 1B is a cross-sectional view taken along line XX in FIG. 1A.
  • It is a schematic plan view of the state which developed the urine absorption pad 1 as an absorptive article concerning this embodiment on a plane.
  • 3A is a cross-sectional view taken along the line AA in FIG. 2
  • FIG. 3B is a cross-sectional view taken along the line BB in FIG. 2
  • FIG. 3C is a cross-sectional view taken along the line CC in FIG.
  • It is the schematic plan view which looked at the urine absorption pad 1 from the non-skin side. It is a figure explaining the composition of the excretion detector 70, the control part 80, and the display apparatus 90.
  • FIG. 6A is a schematic view of an example of the conductive member 71p that constitutes the excrement detection sensor 71, and is an enlarged view of a portion VII in FIG.
  • FIG. 6B is a cross-sectional view taken along a line DD in FIG. 6A.
  • 7A to 7C are diagrams for explaining a method of detecting excrement by the excrement detection sensor 71.
  • FIG. It is a figure showing the flow of judgment operation by control part 80. It is a figure explaining the algorithm which determines based on the time change of an impedance value.
  • FIG. 10A is an enlarged view of the area of the determination period D1 of FIG.
  • FIG. 10B is an enlarged view of a region of the determination period D3 of FIG.
  • An absorbent core provided in an absorbent article the absorbent core for absorbing excrement, a pair of conductive members provided in the absorbent article, having conductivity, and a detection unit for detecting the magnitude of impedance between the conductive members And the presence or absence of excretion is detected based on the change pattern according to the time passage of the impedance detected by the detection unit, and the magnitude of the impedance after a predetermined period has elapsed since the detection of the excretion is compared with a predetermined threshold
  • An absorbent article replacement timing determination device comprising: a control unit that determines a timing at which the absorbent article is replaced.
  • the pair of conductive members are provided along the longitudinal direction of the absorbent core so as to have a predetermined interval in the width direction intersecting the longitudinal direction. Is desirable.
  • the conductive members are easily conducted by wetting the conductive members provided at predetermined intervals in the width direction with the excrement.
  • the impedance value largely changes, it is possible to accurately detect the presence or absence of excretion.
  • the pair of conductive members have higher conductivity at both longitudinal ends than the longitudinal central portion.
  • the range of the wet spreading in the longitudinal direction of the absorbent article changes according to the amount of urine or feces excreted, so the change in impedance value according to the amount of excretion By paying attention to the pattern, it becomes possible to grasp more accurate replacement timing.
  • the control unit calculates a moving average value that is an average value of the magnitudes of the impedances in a certain period, and the movement after a predetermined period has elapsed since excretion is detected. It is desirable to determine that it is timing to replace the absorbent article when the average value is smaller than the predetermined threshold.
  • the control unit calculates an average of the moving average value within a predetermined determination period after a predetermined period has elapsed since the excretion is detected, and the predetermined determination period It is desirable to determine that it is the timing to replace the absorbent article when the average of the moving average value in the area is smaller than the predetermined threshold value.
  • the control unit compares the moving average value after a predetermined period has elapsed since the detection of excretion, and the plurality of threshold values having different sizes, respectively. It is desirable to determine when to replace the absorbent article.
  • the control unit calculates a root mean square slope representing a ratio of a change in magnitude of the impedance to a time change in a certain period, and the calculated root mean square slope is It is desirable to detect that the excretion has been performed when it becomes smaller than a predetermined threshold.
  • the absorbent article replacement timing determination apparatus since the rapid change of the impedance value can be quantified as a slope, it is possible to accurately specify the timing at which the excretion was triggered by such a rapid change. It is possible to accurately determine the replacement timing. It is preferable that the absorbent article replacement timing determination apparatus further includes a display device that displays a timing at which the absorbent article is replaced based on a result of the determination by the control unit.
  • an absorbent article replacement timing determination apparatus it is possible to visually provide information on the replacement timing of the absorbent article to the user. In addition, by displaying a warning, a warning regarding the replacement timing of the absorbent article can be issued.
  • the absorbent article according to the present embodiment is a urine absorption pad 1.
  • the urine absorption pad 1 is attached to a disposable diaper 101 and used.
  • FIG. 1A is a schematic plan view of the diaper 101
  • FIG. 1B is a cross-sectional view taken along line XX in FIG. 1A.
  • the same diaper 101 has a liquid-pervious material covering an absorbent core 111 formed of a liquid absorbent material such as pulp fibers, and the absorbent core 111 from the skin side in the thickness direction.
  • a top sheet 121 and a liquid impermeable back sheet 131 covering the core 111 from the non-skin side are included.
  • the unfolded shape of the diaper 101 has a substantially hourglass shape having a longitudinal direction and a width direction.
  • the central portion in the longitudinal direction has a shape that is narrowed in the width direction.
  • the constricted portion is applied as the crotch to the crotch of the wearer, and the ventral side in the longitudinal direction rather than the crotch is applied to the lower abdomen of the wearer as the front body, and is longer than the crotch.
  • the back portion is applied to the buttocks of the wearer as a back body, whereby the lower body of the wearer is worn.
  • the direction orthogonal to a longitudinal direction and the width direction be the width direction of the diaper 101.
  • the urine absorption pad 1 is placed on and attached to the skin side surface of the top sheet 121 of the diaper 101. Then, when the wearer wears the diaper 101 as it is, the urine absorbing pad 1 is attached to the lower body of the wearer integrally with the diaper 101.
  • the non-skin side of the urine absorption pad 1 is provided with the adhesive material for anti-slip portion made of a hot melt adhesive or the male material of the surface fastener, etc. May be fixed so as not to move relative to each other.
  • FIG. 2 is a schematic plan view of the state which expand
  • 3A is a cross-sectional view taken along the line AA in FIG. 2
  • FIG. 3B is a cross-sectional view taken along the line BB in FIG. 2
  • FIG. 3C is a cross-sectional view taken along the line CC in FIG.
  • the urine absorption pad 1 has a longitudinal direction and a width direction as three directions orthogonal to each other. Moreover, it has the width direction which is a direction orthogonal to a longitudinal direction and the width direction like the diaper 101.
  • the planar shape defined by the longitudinal direction and the width direction of the urine absorption pad 1 is substantially sandglass-shaped as an example of a vertically long shape. That is, the substantially central position in the longitudinal direction has a shape that is narrowed in the width direction.
  • the excretion detection sensor 71 mentioned later is also shown by FIG.
  • the side in contact with the human body in the thickness direction is also referred to as the “skin side”, and the side in contact with the undergarment is also referred to as the “non-skin side”.
  • the longitudinal direction is also referred to as “longitudinal direction”
  • the width direction is also referred to as “horizontal direction”.
  • the front side in the longitudinal direction of the urine absorption pad 1 faces the ventral side of the human body, and the rear side faces the dorsal side of the human body.
  • the dimension of the longitudinal direction of the urine absorption pad 1 is longer than the dimension of the width direction
  • the dimension of the width direction is longer than the dimension of the thickness direction.
  • the urine absorption pad 1 has the main-body part 1s attached to the diaper 101 at the time of use.
  • the main body 1s includes an absorbent core 11 formed of a liquid-absorbent material that absorbs excrement such as urine and feces, and a liquid-permeable surface sheet 21 covering the absorbent core 11 from the skin side in the thickness direction. And a liquid impermeable back sheet 31 covering the core 11 from the non-skin side.
  • the absorbent core 11 is, for example, a mixture of liquid absorbent fibers and liquid absorbent particles as a mixture of two types of liquid absorbent materials in a predetermined composition ratio, as an example of a predetermined shape, to have an hourglass shape in plan view. It is molded. That is, the absorbent core 11 has a shape in which the substantially central position in the longitudinal direction is narrowed in the width direction. Then, this constricted portion is applied between the crotch of the wearer as the crotch portion 11m of the absorbent core 11, and the portion 11a on the front side in the longitudinal direction of the crotch portion 11m is the abdominal side portion 11a of the absorbent core 11. As it is applied to the lower abdomen of the wearer, the rear portion 11b in the longitudinal direction than the same crotch 11m is applied to the buttocks of the wearer as the back side 11b of the absorbent core 11.
  • pulp fibers are used as the liquid absorbent fibers, and a high absorbent polymer (so-called SAP) is used as the liquid absorbent particles, but the present invention is not limited thereto.
  • SAP high absorbent polymer
  • only one of the liquid absorbent fiber and the liquid absorbent granular material may be included as the liquid absorbent material, or in addition to or in place of either of the two types of liquid absorbent materials described above. And other kinds of liquid absorbent materials may be mixed.
  • the absorbent core 11 is covered with the tissue paper 11t as a liquid permeable sheet, but may not be covered. Furthermore, although not provided in this example, an appropriate non-woven fabric, tissue paper or the like may be inserted as a liquid-permeable second sheet between the absorbent core 11 and the surface sheet 21.
  • the surface sheet 21 receives urine and stool excreted from the human body, and sucks it in the thickness direction quickly to lead it to the absorbent core 11.
  • a substantially rectangular sheet larger than the planar shape of the absorbent core 11 Is used.
  • non-woven fabric such as air through non-woven fabric or spun-bonded non-woven fabric is used as a material of the surface sheet 21, and thermoplastic resin fiber such as polyethylene or polyethylene terephthalate is used as a component fiber of non-woven fabric.
  • a compressed portion E in which both the surface sheet 21 and the absorbent core 11 are squeezed together from the skin side in the thickness direction is formed on the skin side of the surface sheet 21, a compressed portion E in which both the surface sheet 21 and the absorbent core 11 are squeezed together from the skin side in the thickness direction is formed. And the absorbent core 11 are integrally joined.
  • the back sheet 31 is a leakproof sheet 31 that prevents urine leakage from the non-skin side of the main body 1 s of the urine absorption pad 1, and its planar shape is the absorbent core 11. It has a substantially hourglass shape larger than that. That is, the outer peripheral edge portion protrudes outward more than the absorbent core 11 over the entire circumference. Then, in a state where the absorbent core 11 is placed on the back surface sheet 31, the back surface sheet 31 is joined, for example, by heat welding or the like at each end in the longitudinal direction and each end in the width direction. The absorbent core 11 is held between the and the top sheet 21.
  • the state in which the absorbent core 11 is held between the back sheet 31 and the top sheet 21 corresponds to the body portion 1 s of the urine absorption pad 1 described above.
  • a material of the back sheet 31 for example, a film made of a thermoplastic resin such as polyethylene or polyethylene terephthalate is used.
  • the main body portion 1s of the urine absorption pad 1 is made to correspond to each end in the width direction of the absorbent core 11 for the purpose of preventing urine leakage to the end side in the width direction.
  • a pair of leak-proof wall parts 40 and 40 are provided.
  • the pair of leak preventing wall portions 40 and 40 are respectively formed by side sheets 41 and 41 made of an SMS non-woven fabric or the like subjected to water repellent treatment or the like.
  • Each side sheet 41, 41 is provided so as to cover each end of the top sheet 21 in the width direction from the skin side along the longitudinal direction. And it fixes to the surface sheet 21 by heat welding etc.
  • the portion 41f extending from the base end portion 41b to the approximate center in the width direction is a free end portion 41f, that is, the portion 41f basically serves as the leakproof wall portion 40.
  • a portion 41s extending from the base end portion 41b to the end in the width direction reaches the end edge in the width direction of the urine absorbing pad 1, and such a portion overlaps the top sheet 21 or the back sheet 31. At the same end edge, they are joined to the top sheet 21 or the back sheet 31 by heat welding or the like.
  • an elastic member 45 such as a rubber thread along the longitudinal direction is fixed to the free end portion 41 f in a stretched state by a hot melt adhesive. Therefore, when the urine absorbing pad 1 is curved in the longitudinal direction such that the top sheet 21 side is on the inner circumferential side, the elastic member 45 contracts in the longitudinal direction and the contraction force is applied to the free end portion 41f.
  • the free end portion 41 f is contracted in the longitudinal direction and stands up from the top sheet 21, whereby the free end portion 41 f functions as the leakage preventing wall portion 40.
  • the free end portion 41f and the base end portion 41b are folded back to form a double sheet of side sheets 41, and the elastic member 45 is interposed between the double sheets of the free end portion 41f. But it is not limited to this.
  • the front end portion 41fa and the rear end portion 41fb of the free end portion 41f are hot melt adhesive etc. in a state of being laid down on the surface sheet 21.
  • the front surface portion 21 fa and the rear end portion 41 fb are not erected and do not stand. Therefore, the contraction force of the elastic member 45 is selectively selectively applied only to the middle portion 41fm existing between the front end portion 41fa and the rear end portion 41fb of the free end portion 41f, and the middle portion 41fm is It shrinks and stands up as a leak-proof wall 40.
  • the urine absorption pad 1 of the present embodiment is provided with an excrement detection function for detecting urination and defecation.
  • an excrement detection function for detecting urination and defecation.
  • the urine absorption pad 1 can be replaced promptly.
  • it can be determined whether the excrement excreted in the urine absorption pad 1 is urine or feces.
  • the excrement detection function will be described.
  • the excrement detection function is realized by providing the excrement detection device 70 and the control unit 80 for the urine absorption pad 1. Also, a display device 90 is separately provided to notify the user of the detected status of excretion.
  • FIG. 5 is a diagram for explaining the configurations of the excrement detection device 70, the control unit 80, and the display device 90. Moreover, the schematic plan view of the urine absorption pad 1 which removes and shows the surface sheet 21 and the side sheet 41 is also shown by FIG.
  • the excrement detection device 70 includes an excrement detection sensor 71 provided in the urine absorption pad 1 and a detection unit 75 provided outside the urine absorption pad 1.
  • the excrement detection sensor 71 detects the urine and stool excreted in the urine absorption pad 1 as a predetermined signal.
  • the excrement detection sensor 71 is a pair of members disposed along the longitudinal direction between the skin side surface of the absorbent core 11 and the surface sheet 21. It has conductive members 71p and 71p.
  • the pair of conductive members 71p and 71p are arranged side by side in the width direction with a space between each other. For example, in the example of FIG.
  • the pair of conductive members 71p and 71p are arranged so as to be line symmetrical with respect to the center line CLW in the width direction, and the conductive members 71p and 71p are arranged before and after the longitudinal direction. It is arranged in a straight line along. Furthermore, the conductive member 71p is electrically connected to the detection unit 75 via a connector 74 (corresponding to a connection portion) at a portion on the front side in the longitudinal direction of the abdominal side portion 11a of the absorbent core 11.
  • FIG. 6A is a schematic view of an example of the conductive member 71p constituting the excrement detection sensor 71, and is an enlarged view of a portion VII in FIG.
  • FIG. 6B is a cross-sectional view taken along a line DD in FIG. 6A.
  • the conductive member 71p has a strip-shaped sheet member 72s, a conductive ink layer 72i, and a covering member 72c for insulation.
  • the strip-like sheet member 72s is a member that is long in the longitudinal direction and has flexibility and predetermined insulation (low conductivity), and is a base material of the conductive member 71p.
  • the entire length in the longitudinal direction of the strip sheet member 72s is, for example, equal to the entire length in the longitudinal direction of the urine absorbing pad 1, and the dimension in the width direction of the strip sheet member 72s is selected from the range of 4 mm to 12 mm. In the above, the width is 8 mm over the entire length, and the dimension in the thickness direction of the strip sheet member 72s is selected from the range of 10 ⁇ m to 50 ⁇ m, and in this example, it is 25 ⁇ m.
  • a conductive ink is continuously applied along the longitudinal direction over the entire length of the skin side surface of the strip-like sheet member 72s, whereby a conductive ink layer 72i is formed.
  • the layer 72i imparts conductivity of a predetermined conductivity (also referred to as electric conductivity, and a unit of (S / m)) over the entire length in the longitudinal direction of the conductive member 71p.
  • the dimension in the width direction of the conductive ink layer 72i is smaller than the dimension in the width direction of the strip-shaped sheet member 72s, and thereby, conductive portions are formed on both sides in the width direction of the skin side surface of the strip-shaped sheet member 72s. An area where no ink layer 72i is present is formed.
  • the dimension in the width direction of the conductive ink layer 72i is selected from the range of 3 mm to 8 mm, and in this example, it is 3 mm. Therefore, on both sides in the width direction, it is selected from the range of 1 to 3.5 mm. In this example, the above-mentioned nonexistent region is formed with a dimension of 2.5 mm in the width direction.
  • the basis weight (g / m 2 ) of the conductive ink layer 72i is selected, for example, from the range of 10 to 30 (g / m 2 ), and is 20 (g / m 2 ) in this example.
  • a covering member 72c for insulation is provided in a partial region of the skin side surface of the strip sheet member 72s so as to cover the skin side surface together with the above-mentioned conductive ink layer 72i from the thickness direction. That is, the insulating covering member 72c is provided so as to protrude in the width direction from both sides in the width direction of the conductive ink layer 72i in order to completely cover the conductive ink layer 72i in a partial region.
  • the conductivity of the covering member 72c is set to a conductivity significantly lower than that of the conductive ink layer 72i. Therefore, the portion of the conductive ink layer 72i is insulated in the area covered with the covering member 72c.
  • the conductive member 71p is covered with the insulating covering member 72c in the crotch 11m which is the region of the central portion in the longitudinal direction of the urine absorbing pad 1 among the conductive members 71p as shown by the hatched portion in FIG. It is insulated.
  • the conductive member 71p is a covering member 72c for insulation in the abdominal side portion 11a which is the region of the front end in the longitudinal direction of the urine absorbing pad 1 and the back side 11b which is the region of the rear end in the longitudinal direction. It is not exposed and is not insulated.
  • the regions for insulating the conductive members 71p and 71p may be set as follows. That is, in FIG. 5, the longitudinal length of the abdominal side 11a of the absorbent core 11 and the entire length in the longitudinal direction of the absorbent core 11 (ie, the total length of the abdominal side 11a, the crotch 11m and the dorsal side 11b) Ratio is set to an arbitrary value of 0.22 to 0.36. The ratio of the longitudinal length of the back side 11b of the absorbent core 11 to the entire length in the longitudinal direction of the absorbent core 11 may be set to an arbitrary value of 0.14 to 0.22. By setting in this manner, when urine is appropriately diffused in the absorbent core 11, it becomes easy to detect that the diffusion state has been reached.
  • a biaxially stretched film such as polypropylene, polyethylene, polyester, polyimide, polyamide imide, polycarbonate, polystyrene and the like can be used, and in this example, a polypropylene film is used.
  • a polypropylene film is used.
  • the conductivity of the strip sheet member 72s is preferably equal to or less than the conductivity of the insulating covering member 72c.
  • the conductive ink according to the conductive ink layer 72i is prepared by kneading a conductive powder, a fixing material (binder), a filler and the like.
  • the conductive powder include conductive metal powders such as silver, gold, copper, nickel and aluminum, and conductive non-metal powders such as carbon and graphite. In this example, conductive carbon and Graphite is used.
  • a fixing material polyvinyl chloride resin, polyacrylic resin, epoxy resin, polyester resin etc. can be illustrated, for example, In this example, polyester resin is used.
  • the filler is, for example, a viscosity adjusting agent for adjusting the viscosity at the time of application of the conductive ink, or a dispersing agent for enhancing the application property at the time of application, and is suitably isophorone or anone.
  • these electroconductive powder, a fixing material, and a filler are mix
  • the conductive ink layer 72i is formed on the strip sheet member 72s by, for example, screen printing, direct gravure printing, flexo printing, or the like.
  • a silicone type adhesive agent As a material of the covering member 72c for insulation, a silicone type adhesive agent, a hot-melt type
  • the detection unit 75 includes a power supply in which the positive electrode and the negative electrode are connected to the ends of the pair of conductive members 71p and 71p via the connector 74, and a tester (both not shown) for measuring the potential of the conductive member 71p.
  • a current is supplied between the pair of conductive members 71p, 71p, and the magnitude of the voltage of the conductive member 71p is measured at predetermined time intervals and output as an impedance.
  • a weak current is caused to flow by setting one side of the pair of conductive members 71p and 71p as a positive electrode and the other side as a negative electrode, and measuring the magnitude of the voltage relative to the supplied current value when the conductive members 71p and 71p conduct. By doing this, the impedance value can be obtained. Further, in the detection unit 75 of the present embodiment, it is possible to switch between the positive electrode side and the negative electrode side of the pair of conductive members 71p and 71p at predetermined time intervals. That is, at a certain time point t, it is possible to supply a negative current to one of the conductive members 71p (for convenience 71p1) and a positive current to the other conductive member 71p (for convenience 71p).
  • the control unit 80 determines the presence or absence of excretion from the change pattern of the impedance value detected by the detection unit 75 according to the passage of time, and determines whether the excrement is urine or feces, or the urine absorbing pad 1 It judges about the exchange timing of. Further, the control unit 80 controls an operation (e.g., a condition such as a detection interval of the impedance value or a magnitude of the supplied current) when detecting the impedance by the detection unit 75.
  • the control unit 80 includes a CPU (central processing unit) and a memory (storage device) (both not shown). Although FIG. 5 illustrates the control unit 80 and the detection unit 75 as different units, the control unit 80 and the detection unit 75 may be integrally configured. The specific determination operation by the control unit 80 will be described later.
  • the display device 90 is a device that displays information on excretion or issues a warning based on the result of the determination by the control unit 80.
  • the information on excretion in the present embodiment is mainly information on the replacement timing of the urine absorption pad 1 and information on whether the excrement is urine or stool.
  • three-color lamps of a blue lamp 91a, a yellow lamp 91b, and a red lamp 91c are provided. Each lamp emits light or blinks according to the determination result of the control unit 80 to transmit the determination result to the user as visual information.
  • a speaker (not shown) may be provided in the display device 90, and the determination result may be transmitted to the user by outputting a sound such as a warning sound.
  • FIG. 7A is a diagram showing the state of the urine absorption pad 1 when a small amount of urine is excreted in the urine absorption pad 1.
  • the pair of conductive members 71p, 71p of the waste detection sensor 71 are disposed apart in the width direction. And between the conductive members 71p and 71p, the absorbent core 11 (the urine absorption pad 1) having low conductivity is disposed. Therefore, when the absorbent core 11 is in a dry state, the conductive members 71p and 71p are nonconductive and current hardly flows, so a relatively large impedance is detected between the conductive members 71p and 71p.
  • the urine wets and spreads on the crotch 11m which is a region in the longitudinal middle portion of the urine absorption pad 1, and the space between the conductive members 71p and 71p
  • the absorbent core 11 becomes wet.
  • the conductive ink layer 72i of the conductive member 71p is covered with the insulating covering member 72c in the region of the crotch 11m, even if the absorbent core 11 is wet in that region, the conductive member 71p is , 71p is still non-conductive. Therefore, even when a small amount of urine is excreted, the detected impedance has a high value.
  • the blue lamp 91a may be turned on in the display device 90, and it may be displayed that the amount of excreted urine or the like is small, that it is slightly excreted.
  • FIG. 7B is a diagram showing the state of the urine absorbing pad 1 when medium-level (more than the amount shown in FIG. 7A) urine is excreted in the urine absorbing pad 1.
  • the urine spreads from the crotch 11m of the urine absorption pad 1 to the area of the ventral side 11a.
  • the conductive members 71p and 71p do not conduct, and current hardly flows.
  • the absorbent core 11 becomes wet in this area.
  • the yellow lamp 91b may be turned on in the display device 90 to indicate that urine or the like has been excreted.
  • the exchange timing of the urine absorption pad 1 can be determined by utilizing this phenomenon. Details of the determination will be described later.
  • FIG. 7C is a diagram showing the state of the urine absorbing pad 1 when a large amount (more than the amount shown in FIG. 7B) of urine is excreted in the urine absorbing pad 1.
  • urine spreads from the ventral side 11 a to the dorsal side 11 b of the urine absorption pad 1.
  • the absorbent core 11 is wetted in the region of the ventral side portion 11a and the back side portion 11b, and the conductive members 71p are electrically connected to each other.
  • the larger the conduction region the more easily the current flows, and the detected impedance value is further reduced. This makes it possible to detect that urine or the like has spread over a wide area.
  • the red lamp 91 c may be turned on in the display device 90 to indicate that there is a possibility that the excrement may leak to the outside of the urine absorption pad 1.
  • the red lamp 91 c may be turned on in the display device 90 to indicate that there is a possibility that the excrement may leak to the outside of the urine absorption pad 1.
  • FIG. 8 is a diagram showing the flow of the determination operation by the control unit 80.
  • FIG. 9 is a diagram for explaining an algorithm for making a determination based on the time change of the impedance value.
  • the excrement detection sensor 71 detects the impedance between the pair of conductive members 71p disposed in the urine absorption pad 1 (S101).
  • the detection of the impedance is performed at predetermined time intervals. For example, in the case of FIG. 9, the impedance value is detected every one second (s).
  • the state of the time change of the detected impedance is shown as data A of FIG.
  • the measurement is started when the time is 8:45, and the impedance value is detected while fluctuating in the range of about 4.5 to 4.75 between 8:57.
  • the variation of the impedance value of about 0.25 is due to the influence of an error due to noise or the like, and does not affect the determination result.
  • the impedance value is represented by an absolute value.
  • the control unit 80 calculates the moving average value Z of the measured impedance values (S102).
  • the moving average value Z is a value obtained by taking an average (sample average value) of impedance values that fluctuate in a time range (a target period) of a predetermined length. For example, in the case of calculating a moving average value for n seconds at a certain time t, (n + 1) impedance values y (t ⁇ n) to be detected during a target period of n seconds from (t ⁇ n) to t It is represented by the following formula (1) using y (t).
  • the impedance value y as a moving average value Z in a predetermined period, the influence of noise and the like can be reduced. For example, if the impedance value drops sharply due to the influence of noise at a certain moment during the measurement of the impedance value, it may be misjudged as the replacement timing based on the impedance value at that moment, There is a possibility that information different from the state of may be displayed. However, by treating the impedance value as a moving average value in a certain focused period, it becomes possible to remove the influence of instantaneous fluctuations and errors, and more accurate data can be obtained. It is desirable that the target period for calculating the moving average value be approximately 1 to 600 seconds in order to efficiently remove noise.
  • the impedance value is detected at a relatively long interval, with a measurement interval of 1 second. Therefore, even if the impedance value changes significantly during the 1 second, noise can be obtained by taking the target period as long as possible. And so on.
  • the state of the change of the moving average value Z of the impedance is shown as data B.
  • the moving average value Z is calculated from 181 impedance values, where the target period is 180 seconds.
  • the root mean square slope m is calculated from the impedance value y (S103).
  • the root mean square slope m represents the rate of change of the impedance value with respect to time change during a certain period (period of interest), and is calculated by the following equation (2).
  • y avg represents the average value of impedance values in the target period
  • t represents time
  • t avg represents the average time of the target period.
  • the state of the change of the mean square slope m of the impedance is shown as data C.
  • the magnitude of the mean square slope m makes it possible to visually recognize the magnitude of the change in the impedance value during a certain period (period of interest). For example, if the mean square slope m is a negative value, it indicates that the impedance value drops with time, and the larger the absolute value of the mean square slope m at that time, the larger the rate of drop of the impedance value. .
  • the target period is 180 seconds.
  • the control unit 80 compares the value of the root mean square slope m with the predetermined threshold Se (referred to as the excretion threshold) (S104 in FIG. 8), and the value of the root mean square slope m is smaller than the excretion threshold Se. When it becomes (S104 is Yes), it determines with excretion having been performed in the urine absorption pad 1 (S105).
  • the excretion threshold referred to as the excretion threshold
  • the replacement determination of the urine absorption pad 1 is performed after elapse of a predetermined time Ti from the time when the excretion is detected (S106).
  • the moving average value Z of the impedance sharply decreases at time t1, and then reverses and rises at time t2. This is because when urine or stool is excreted in the urine absorption pad 1, immediately after the excision is performed, as shown in FIG. 7B or FIG. 7C, the conductive members 71p and 71p are wetted. If the absorbent core 11 maintains sufficient water absorbability, the excreted urine is absorbed with the passage of time, so that the conductive members 71p and 71p gradually become dry and it is difficult to conduct electricity again.
  • the moving average value Z of impedance is compared with a predetermined threshold value Sr (referred to as the replacement threshold value) (S107), and the value of the moving average value Z becomes smaller than the replacement threshold value Sr.
  • S107 a predetermined threshold value
  • Sr referred to as the replacement threshold value
  • the size of the average value of the moving average value Z is compared with the exchange threshold value Sr. Then, since the average value of the moving average value Z indicates a value larger than the replacement threshold value Sr, it is determined that it is not necessary to replace the urine absorption pad 1.
  • the magnitude of the moving average value Z in the determination period D2 is smaller than the magnitude of the moving average value Z in the determination period D1. This indicates that the absorption capacity of the absorbent core 11 is reduced due to the absorption of two excrement.
  • the size of the average value of the moving average value Z is compared with the exchange threshold value Sr.
  • the moving average value Z of the impedance shows a value smaller than the replacement threshold Sr in the entire determination period D3, it is determined that the urine absorption pad 1 needs to be replaced, and the user is notified of that A warning is issued to notify you.
  • FIG. 9 it can be seen that the absorption capacity of water by the absorbent core 11 has reached the limit by three excretions.
  • a warning of replacement timing may be given at one time.
  • the average value of the moving average value Z during the determination period is compared with the exchange threshold Sr, but the comparison method is not limited to this.
  • the minimum value of the moving average value Z during the determination period may be compared with the exchange threshold value Sr.
  • the replacement threshold value Sr in the determination period D2 the replacement timing is determined in the second stage of the excretion.
  • the determination of the replacement timing is performed by one type of replacement threshold Sr, but the determination may be performed by a plurality of replacement thresholds.
  • two types of exchange thresholds Sr1 and Sr2 having different sizes are provided (Sr1 ⁇ Sr2).
  • the moving average value Z and the two types of exchange thresholds Sr1 and Sr2 are respectively displayed to display a warning in stages. For example, if it is determined that Sr1 ⁇ moving average value Z ⁇ Sr2 as a result of comparison, replacement of the urine absorbing pad 1 is unnecessary, but it is displayed that the replacement timing is near. At this time, as shown in FIG.
  • the control unit 80 compares the mean square slope m with a predetermined threshold value Sf (set as a stool determination threshold value), and if the mean square slope m is larger than the stool determination threshold Sf (Yes in S109) It is determined that it is "urine” (S110). On the other hand, if the root mean square slope m is equal to or less than the stool determination threshold Sf (No in S109), it is determined that the excrement is "stool."
  • the determination in S109 may be performed in the same determination period as in S107 (D1 to D3 in FIG. 9), or may be determined separately.
  • the judgment principle of whether the excrement is "urine” or “feces” is as follows. First, when “urine” is excreted in the urine absorption pad 1, absorption of urine by the absorbent core 11 changes the state between the conductive members 71 p and 71 p from the wet state to the dry state. The impedance value tends to rise according to the time change in. For example, after the excretion is confirmed at time te1 in FIG. 9, the impedance value rises after time t2, so the root mean square slope m is a positive value. That is, when the excrement is "urine", the mean square slope m during the determination period is highly likely to show a positive value.
  • the impedance value gradually drops after time t7, so the root mean square slope m is a negative value. That is, when the excrement is "feces", the probability that the root mean square slope m during the determination period shows a positive value is low. Therefore, if the stool determination threshold Sf is set to a predetermined value close to zero, whether the excrement is "urine" or not by focusing on the magnitude relationship between the root mean square slope m and the stool determination threshold Sf Can be determined.
  • the control unit 80 compares the root mean square slope m with the stool determination threshold Sf based on such a property.
  • the stool determination threshold value Sf is set to 0.0001 (1 / s).
  • FIG. 10A is an enlarged view of the area of the determination period D1 of FIG.
  • FIG. 10B is an enlarged view of the area of the determination period D3 of FIG.
  • the root mean square slope m shows a value larger than the stool determination threshold Sf. Therefore, it is determined that the first excretion is urine.
  • the mean square slope m shows a value smaller than the stool determination threshold Sf.
  • the third excretion is determined to be stool.
  • the average value of the mean square slope m during the determination period may be compared with the stool determination threshold Sf, or the maximum value or the minimum value of the mean square slope m during the determination period
  • the stool determination threshold Sf may be compared. If it is determined that the excrement is "feces", a warning for replacing the urine absorption pad 1 is issued by turning on the red lamp 91c of the display device 90 or the like as in the step S108. You should keep it in mind.
  • each processing such as impedance value detection is ended, and when the determination operation is not ended (S112: No), the process returns to S101 and continues each processing. .
  • the urine absorption pad 1 is replaced at time t8, and the impedance value is returned to the initial value (about 4.7).
  • the urine absorption pad 1 was illustrated as an absorptive article, it is not restricted to this at all. That is, the excrement detection device 70 described above may be provided for the disposable diaper.
  • the pair of conductive members 71p and 71p are interposed between the surface sheet 21 and the absorbent core 11 as the excrement detection sensor 71, but the arrangement position of the conductive members 71p is Not exclusively.
  • it may be interposed between the absorbent core 11 and the back sheet 31, or may be interposed at a position other than these.
  • the conductive member 71p has the strip-like sheet member 72s and the conductive ink layer 72i formed on the skin side surface, and the conductive ink layer 72i is covered with the insulating covering member 72c.
  • a coated electric wire formed by covering the outer periphery of a metal wire with a suitable insulating covering member such as a vinyl-coated copper wire may be used as the conductive member 71p.
  • the coated electric wire is disposed along the longitudinal direction, the rear end of the coated electric wire is located on the back side 11b of the absorbent core 11, and the coating on the rear end is peeled off The line is exposed.
  • the conductive members 71p are arranged in a straight line along the longitudinal direction, but it is not limited thereto. That is, as long as the conductive member 71p is disposed along the longitudinal direction, the position in the width direction may be slightly changed according to the position in the longitudinal direction. For example, it may be disposed to extend in the longitudinal direction with a slight corrugation. That is, in the broad sense, the meaning of the description “the conductive member 71p is provided along the longitudinal direction” means that “the direction in which the conductive member 71p extends is within an angle range of less than 45 degrees with respect to the longitudinal direction.
  • the direction in which the conductive member 71p extends is within the range of an angle less than 30 degrees with respect to the longitudinal direction
  • the conductive member The direction in which the 71p extends is within the range of an angle of less than 10 degrees with respect to the longitudinal direction.
  • the display device 90 is connected to the control unit 80 by wire, and displays warnings and the like, but the present invention is not limited thereto.
  • information such as a warning to be displayed on the display unit 90 may be transmitted to a portable terminal such as a smartphone or a user's home computer by wireless communication, and the information may be confirmed by the terminal. In this way, it is possible to freely obtain information even when away from home or at home.
  • a memory device of small size for example, a USB flash memory or the like
  • a USB flash memory or the like may be used to provide extensibility.
  • 1 urine collection pad (absorbent article), 1s body part, 11 absorbent core, 11a ventral side, 11m crotch, 11b dorsal side, 11t tissue paper, 21 front sheet, 31 back sheet, 40 leakproof wall, 41 side sheet, 41b base end, 41f free end, 41fa front end, 41fb rear end, 41fm middle part, 41s part, 45 elastic members, 70 waste detection device, 71 waste detection sensor, 71p conductive member, 72s band-shaped sheet member, 72i conductive ink layer, 72c insulating covering member, 74 connector (connection), 75 detectors, 80 controls, 90 displays, 91a blue lamp, 91b yellow lamp, 91c red lamp, E-pressing unit, CLW central line,

Abstract

La présente invention comprend : un noyau absorbant qui est disposé dans un article absorbant et absorbe des excrétions; une paire d'éléments conducteurs, qui est disposée dans l'article absorbant et a une conductivité; une partie de détection qui détecte la dimension d'impédance entre les éléments conducteurs; et une partie de commande qui détecte la présence ou l'absence d'excrétion, sur la base d'un modèle de changement au fil du temps de l'impédance détectée par la partie de détection, et détermine un moment de changement d'article absorbant en comparant la dimension d'impédance après écoulement d'une durée prescrite une fois que des excrétions sont détectées comme ayant atteint un seuil prescrit.
PCT/JP2014/084269 2014-01-06 2014-12-25 Dispositif de détermination de moment de changement d'article absorbant et procédé de détermination de moment de changement d'article absorbant WO2015102085A1 (fr)

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CN113876491A (zh) * 2021-09-17 2022-01-04 北京他山中科瑞尔联触实验室科技有限公司 一种可区分大小便的卫生产品
WO2022002362A1 (fr) * 2020-06-30 2022-01-06 Essity Hygiene And Health Aktiebolag Procédé d'évaluation d'un degré de saturation d'un article sanitaire absorbant
WO2022002361A1 (fr) * 2020-06-30 2022-01-06 Essity Hygiene And Health Aktiebolag Procédé permettant de faire la distinction entre des types d'excrétion dans un article d'hygiène absorbant
CN113933352A (zh) * 2021-09-17 2022-01-14 北京他山中科瑞尔联触实验室科技有限公司 大小便检测装置及卫生产品
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US11452644B2 (en) 2011-06-03 2022-09-27 The Procter & Gamble Company Absorbent articles comprising sensors
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US10492148B2 (en) 2013-08-08 2019-11-26 The Procter & Gamble Company Sensor systems for absorbent articles comprising sensor gates
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US10285871B2 (en) 2016-03-03 2019-05-14 The Procter & Gamble Company Absorbent article with sensor
US11464680B2 (en) 2016-03-03 2022-10-11 The Procter & Gamble Company Absorbent article with sensor
US10285872B2 (en) 2016-03-03 2019-05-14 The Procter & Gamble Company Absorbent article with sensor
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US11013640B2 (en) 2018-05-04 2021-05-25 The Procter & Gamble Company Sensor devices and systems for monitoring the basic needs of an infant
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WO2022002362A1 (fr) * 2020-06-30 2022-01-06 Essity Hygiene And Health Aktiebolag Procédé d'évaluation d'un degré de saturation d'un article sanitaire absorbant
WO2022002361A1 (fr) * 2020-06-30 2022-01-06 Essity Hygiene And Health Aktiebolag Procédé permettant de faire la distinction entre des types d'excrétion dans un article d'hygiène absorbant
CN113876491A (zh) * 2021-09-17 2022-01-04 北京他山中科瑞尔联触实验室科技有限公司 一种可区分大小便的卫生产品
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