WO2014163503A1 - A moisture sensing module and a napkin - Google Patents

A moisture sensing module and a napkin Download PDF

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Publication number
WO2014163503A1
WO2014163503A1 PCT/NL2014/050214 NL2014050214W WO2014163503A1 WO 2014163503 A1 WO2014163503 A1 WO 2014163503A1 NL 2014050214 W NL2014050214 W NL 2014050214W WO 2014163503 A1 WO2014163503 A1 WO 2014163503A1
Authority
WO
WIPO (PCT)
Prior art keywords
moisture
layer
dielectric layer
sensing module
module according
Prior art date
Application number
PCT/NL2014/050214
Other languages
French (fr)
Inventor
Irene Martine VAN DE BELD
Benno Groosman
Original Assignee
Fred Bergman Healthcare Pty Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fred Bergman Healthcare Pty Ltd filed Critical Fred Bergman Healthcare Pty Ltd
Publication of WO2014163503A1 publication Critical patent/WO2014163503A1/en

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Classifications

    • 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 invention relates to a moisture sensing module for monitoring an amount of moisture, comprising a tag layer including an electrical passive resonance circuit.
  • the sensing module can e.g. be attached to a moisture absorbing section of a napkin.
  • the moisture sensing module disclosed in WO '096 has proven that a significant improvement can be reached, in a reduction of unnecessary napkin replacements as well as in a reduction of leaking napkins, it appears that a further efficiency improvement could be reached if both the dry state and the wet state of the sensor are determined more reliably.
  • the design of the sensor disclosed in WO '096 is such that no differentiation is possible between a wet state of the sensor and a situation wherein no sensor at all is detected, e.g. when the reading device is not close enough to the moisture sensitive sensor. Differentiation between theses two situations can be relevant in practice to avoid unnecessary napkin
  • the moisture detecting module also comprises a dielectric layer covering the tag layer, and an absorption layer on top of the dielectric layer for receiving the amount of moisture to be monitored.
  • variable capacitive element By providing an absorption layer- dielectric layer-tag layer structure, a variable capacitive element is connected to the resonance circuit.
  • the actual capacitive value of the variable capacitive element is directly related to a degree of moisture in the absorption layer. Then, the amplitude variation in the resonance signal due to moisture in the module is only moderate so that a resonance signal can be read both in the dry state and in the wet state of the module.
  • the electrical properties of the resonance circuit components in the tag layer are not modified by the presence of any moisture in the module. Due to the variable capacitance of the structure, also the resonance frequency of the entire electrical system including the resonance circuit and the variable capacitive element varies, thus enabling that a reader can distinguish between the dry state and the wet state.
  • the dry state, the wet state and the situation wherein no module is detected can reliably be distinguished by an external reading device, so that a further improvement in efficiency can be obtained.
  • Fig. 1 shows a schematic cross sectional side view of a first embodiment of a moisture detecting module according to the invention attached to a napkin;
  • Fig. 3 shows a schematic cross sectional side view of a second embodiment of a moisture detecting module according to the invention attached to a napkin;
  • the tag layer 2, the dielectric layer 3 and the absorption layer 4 form a sandwich structure. Further, the top surface 8 and the bottom surface 9 of the tag layer 2 are shielded against moisture particles, so that the electrical properties of the passive electrical resonance circuit
  • the dielectric layer 3 forms a barrier shielding the tag layer 2 against moisture articles. Further, the dielectric layer 3 serves as an electric isolator forming a dielectric element of a capacitor, as described in more detail below. Alternatively, however, a separate barrier layer is applied, e.g. as an intermediate layer between the tag layer 2 and the dielectric layer 3.
  • the module 1 comprises an additional dielectric layer 10 arranged below the tag layer 2 such that the tag layer 2 is sandwiched between the dielectric layer 3 and the additional dielectric layer 10.
  • the additional dielectric layer 10 forms a barrier shielding the tag layer 2
  • the additional dielectric layer 10 further serves as an electric isolator forming a dielectric element of a capacitor, as described below. It is noted that a separate barrier layer can be applied, e.g. as an intermediate layer between the tag layer 2 and the additional dielectric layer 10.
  • the electrical properties of the dielectric layers 3, 10 are designed such that the electrical influence of any moisture in the absorbing layer 4 is dominant compared with the electrical influence of moisture in the moisture absorbing section 7 of the napkin 6.
  • the capacitance formed by the structure including the absorption layer 4, the dielectric layer 3 and the tag layer 2 is significantly larger than the capacitance formed via the additional dielectric layer 10, e.g. by selecting material such that the electrical permittivity of the dielectric layer 3 is larger than the electrical permittivity of the additional dielectric layer 10 and/or by choosing the thickness of the dielectric layer 3
  • the bottom surface of the module 1 is arranged for attachment to the skin facing surface 11 of a napkin 6 including a moisture absorbing section 7. Therefore, the bottom surface of the module 1 is provided with an adhesive layer 5 attaching the module 1 to the skin facing surface moisture absorbing section 7 of the napkin 6.
  • FIG. 2 shows an electrical equivalent of the moisture detecting module 1 of Fig. 1.
  • the resonance circuit R includes an inductance L and a resonance capacitance C re s, thus forming a resonance LC-loop.
  • the resonance circuit R includes thin film technology components. More preferably, the resonance circuit R is integrally formed using thin film technology.
  • the resonance circuit R is tuned to a specific RF resonance frequency, e.g. circa 8.2 MHz.
  • the sensor can also be set to another RF resonance frequency, e.g. 8.0 MHz.
  • the resonance frequency can be tuned to other frequencies as well.
  • the resonance circuit R can be implemented as a so-called EAS tag type.
  • combination with the absorption layer 4 represents a parasitic circuit PC including a variable electric capacitance C va r.
  • the passive resonance circuit interacts with an electromagnetic interrogation field so as to transmit local moisture information in a non- contacting way to an external reading device.
  • the reading device generates an interrogating electromagnetic field, e.g. a signal having fixed RF frequency of e.g. circa 8.2 MHz, or a signal having a sweeping frequency ranging between circa 7.7 MHz and circa 8.7 MHz, or between circa 7.45 MHz and circa 8.55 MHz.
  • an interrogating electromagnetic field e.g. a signal having fixed RF frequency of e.g. circa 8.2 MHz, or a signal having a sweeping frequency ranging between circa 7.7 MHz and circa 8.7 MHz, or between circa 7.45 MHz and circa 8.55 MHz.
  • the resonance circuit R having a resonance characteristic
  • the circuit acts as a RF transmission element, also called RF tag, transmitting an electromagnetic response signal that is received by the reading device, thereby obtaining a wireless RF moisture detecting system for monitoring a moisture state of the sensor.
  • Figure 3 shows a schematic cross sectional side view of a second embodiment of a moisture detecting module 1 according to the invention.
  • Figure 4 shows a diagram of the resonance frequency of a moisture detecting module as a function of moisture.
  • the diagram D indicates the actual resonance frequency Res [MHz] as a function of moisture [%] in the absorption layer 4 of the module 1.
  • the resonance frequency Res has a maximum at circa 8.2 MHz.
  • the variable capacitance C va r increases, thus lowering the resonance frequency Res.
  • the permittivity of the dielectric layer 3 and the thickness of said layer 3 are chosen such that, on the one hand, variation in the resonance frequency is easily detectable by a reading device, while, on the other hand, the resonance frequency is still in a range that is detectable by the reading device, e.g. higher than circa 7.65 MHz.
  • the moisture sensing module can not only be used in combination with a napkin, but also with other nursing articles wherein a moisture state has to be monitored, e.g. a banding or dressing.
  • the moisture sensing module can also be used in industrial processes, e.g. for monitoring a sealing, such as a seam or joint of pipe segments, or seals between moisture impermeable plates.
  • the moisture sensing module can be used in water impermeable plates, underground pipes, sewer draines, pipelines, etc.
  • the moisture sensing module is mounted at a side of a structure that is shielded against ground water, thus measuring the effectiveness of the sealing can be tested.
  • a moisture sensing module is installed at the inner side of watertight pipes to monitore the water permeability of the pipes.
  • a moisture sensing module can be located at the side of a water impermeable plate that should be dry.
  • an identification can be added to the moisture sensing module rendering a so-called RF-ID tag, enabling identification of the module upon reading it.
  • the components of the moisture sensing module are stable, so that the module is durable, meaning that its function is reliable during a relatively long period, e.g. more than circa a year or more than circa 10 years.

Landscapes

  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Absorbent Articles And Supports Therefor (AREA)

Abstract

The invention relates to a moisture sensing module for monitoring an amount of moisture. The module comprises a tag layer including a passive electrical resonance circuit, a dielectric layer covering the tag layer, and an absorption layer on top of the dielectric layer for receiving the amount of moisture to be monitored. Preferably, the tag layer, the dielectric layer and the absorption form a sandwiched structure.

Description

Title: A moisture sensing module and a napkin
The invention relates to a moisture sensing module for monitoring an amount of moisture, comprising a tag layer including an electrical passive resonance circuit.
Such a moisture sensing module is e.g. known from the
International patent publication WO 2011/005096, including a moisture sensitive sensor and a moisture non-permeable layer covering the sensor. The sensing module can e.g. be attached to a moisture absorbing section of a napkin.
The moisture sensitive sensor in WO '096 includes a passive electrical resonance circuit generating a resonance signal when the module is impinged by an external magnetic field. Then, the resonance signal is wirelessly read by a reading device. Electrical characteristics of the resonance circuit, such as the amplitude of the resonance signal, are highly influenced by the presence of any moisture in the sensor. Discrimination between a wet state and a dry state of the sensor is possible by checking whether resonance signal is received from the resonance circuit.
When moisture is detected in the napkin, the reading device may generate a warning signal so that a nursing or caring professional is made aware that the napkin of the person has to be replaced. Applying such moisture sensing modules enables a more efficient treatment of people that wear a napkin due to incontinence problems, e.g. elderly people, especially if said people can not actively indicate that a current napkin has to be replaced, either because they do not realize that the napkin is wet or are less able to warn a nurse.
Although the moisture sensing module disclosed in WO '096 has proven that a significant improvement can be reached, in a reduction of unnecessary napkin replacements as well as in a reduction of leaking napkins, it appears that a further efficiency improvement could be reached if both the dry state and the wet state of the sensor are determined more reliably. The design of the sensor disclosed in WO '096 is such that no differentiation is possible between a wet state of the sensor and a situation wherein no sensor at all is detected, e.g. when the reading device is not close enough to the moisture sensitive sensor. Differentiation between theses two situations can be relevant in practice to avoid unnecessary napkin
replacements.
It is an object of the invention to provide a moisture sensing module according to the preamble enabling differentiating between a dry state, a wet state and a state wherein no module is detected by a reading device. Thereto, the moisture detecting module also comprises a dielectric layer covering the tag layer, and an absorption layer on top of the dielectric layer for receiving the amount of moisture to be monitored.
By providing an absorption layer- dielectric layer-tag layer structure, a variable capacitive element is connected to the resonance circuit. The actual capacitive value of the variable capacitive element is directly related to a degree of moisture in the absorption layer. Then, the amplitude variation in the resonance signal due to moisture in the module is only moderate so that a resonance signal can be read both in the dry state and in the wet state of the module. The electrical properties of the resonance circuit components in the tag layer are not modified by the presence of any moisture in the module. Due to the variable capacitance of the structure, also the resonance frequency of the entire electrical system including the resonance circuit and the variable capacitive element varies, thus enabling that a reader can distinguish between the dry state and the wet state.
Further, no resonance signal is read when no module is detected.
Advantageously, the dry state, the wet state and the situation wherein no module is detected can reliably be distinguished by an external reading device, so that a further improvement in efficiency can be obtained.
The invention is also directed to a napkin comprising a moisture absorbing section and a moisture sensing module as above described. Advantageous embodiments according to the invention are described in the following claims.
By way of example only, embodiments of the present invention will now be described with reference to the accompanying figures in which
Fig. 1 shows a schematic cross sectional side view of a first embodiment of a moisture detecting module according to the invention attached to a napkin;
Fig. 2 shows an electrical equivalent of the moisture detecting module of Fig. 1;
Fig. 3 shows a schematic cross sectional side view of a second embodiment of a moisture detecting module according to the invention attached to a napkin; and
Fig. 4 shows a diagram of the resonance frequency of a moisture detecting module as a function of moisture.
It is noted that the figures show merely a preferred embodiment according to the invention. In the figures, the same reference numbers refer to equal or corresponding parts.
Figure 1 shows schematic cross sectional side view of a first embodiment of a moisture detecting module according to the invention. The module 1 is arranged for monitoring an amount of moisture, and comprises a tag layer 2 including a passive electrical resonance circuit, a dielectric layer 3 covering the tag layer 2, and an absorption layer 4 on top of the dielectric layer 3 for receiving the amount of moisture to be monitored.
The tag layer 2, the dielectric layer 3 and the absorption layer 4 form a sandwich structure. Further, the top surface 8 and the bottom surface 9 of the tag layer 2 are shielded against moisture particles, so that the electrical properties of the passive electrical resonance circuit
components on the tag layer 2 remain unaffected when moisture particles are received by the module 1. However, the electric behavior of the resonance circuit is influenced by the actual state of the absorption layer 4. In the shown embodiment, the dielectric layer 3 forms a barrier shielding the tag layer 2 against moisture articles. Further, the dielectric layer 3 serves as an electric isolator forming a dielectric element of a capacitor, as described in more detail below. Alternatively, however, a separate barrier layer is applied, e.g. as an intermediate layer between the tag layer 2 and the dielectric layer 3.
Further, the module 1 comprises an additional dielectric layer 10 arranged below the tag layer 2 such that the tag layer 2 is sandwiched between the dielectric layer 3 and the additional dielectric layer 10. The additional dielectric layer 10 forms a barrier shielding the tag layer 2
against moisture particles. Similar to the dielectric layer 3 covering the tag layer 2, the additional dielectric layer 10 further serves as an electric isolator forming a dielectric element of a capacitor, as described below. It is noted that a separate barrier layer can be applied, e.g. as an intermediate layer between the tag layer 2 and the additional dielectric layer 10. The electrical properties of the dielectric layers 3, 10 are designed such that the electrical influence of any moisture in the absorbing layer 4 is dominant compared with the electrical influence of moisture in the moisture absorbing section 7 of the napkin 6.
In particular, the capacitance formed by the structure including the absorption layer 4, the dielectric layer 3 and the tag layer 2 is significantly larger than the capacitance formed via the additional dielectric layer 10, e.g. by selecting material such that the electrical permittivity of the dielectric layer 3 is larger than the electrical permittivity of the additional dielectric layer 10 and/or by choosing the thickness of the dielectric layer 3
significantly smaller than the thickness of the additional dielectric layer 10. As an example, the dielectric layer 3 is made from a plastic and/or the additional dielectric layer 10 is made from a foam.
The bottom surface of the module 1 is arranged for attachment to the skin facing surface 11 of a napkin 6 including a moisture absorbing section 7. Therefore, the bottom surface of the module 1 is provided with an adhesive layer 5 attaching the module 1 to the skin facing surface moisture absorbing section 7 of the napkin 6.
Alternatively, the top surface of the module 1 is attached to the moisture absorbing section 7 of the napkin 6.
Figure 2 shows an electrical equivalent of the moisture detecting module 1 of Fig. 1. The resonance circuit R includes an inductance L and a resonance capacitance Cres, thus forming a resonance LC-loop. Preferably, the resonance circuit R includes thin film technology components. More preferably, the resonance circuit R is integrally formed using thin film technology. The resonance circuit R is tuned to a specific RF resonance frequency, e.g. circa 8.2 MHz. However, the sensor can also be set to another RF resonance frequency, e.g. 8.0 MHz. Apparently, the resonance frequency can be tuned to other frequencies as well. The resonance circuit R can be implemented as a so-called EAS tag type. The dielectric layer 3 in
combination with the absorption layer 4 represents a parasitic circuit PC including a variable electric capacitance Cvar.
During use of the moisture sensing module 1 according to the invention, the passive resonance circuit interacts with an electromagnetic interrogation field so as to transmit local moisture information in a non- contacting way to an external reading device.
The reading device generates an interrogating electromagnetic field, e.g. a signal having fixed RF frequency of e.g. circa 8.2 MHz, or a signal having a sweeping frequency ranging between circa 7.7 MHz and circa 8.7 MHz, or between circa 7.45 MHz and circa 8.55 MHz. When the resonance circuit R, having a resonance characteristic, is activated, the circuit acts as a RF transmission element, also called RF tag, transmitting an electromagnetic response signal that is received by the reading device, thereby obtaining a wireless RF moisture detecting system for monitoring a moisture state of the sensor. Figure 3 shows a schematic cross sectional side view of a second embodiment of a moisture detecting module 1 according to the invention.
Here, the electrical properties of the dielectric layers 3, 10 have been interchanged compared with the embodiment shown in Fig. 1, so that moisture in the moisture absorbing section 7 of the napkin is now dominant with respect to moisture in the absorbtion layer 4. The capacitance resulting via the dielectric layer 3, arranged between the tag layer 2 and the absorption layer 4, is now significantly smaller than the capacitance resulting via the additional dielectric layer 10, e.g. by selecting material such that the electrical permittivity of the dielectric layer 3 is smaller than the electrical permittivity of the additional dielectric layer 10 and/or by choosing the thickness of the dielectric layer 3 significantly larger than the thickness of the additional dielectric layer 10.
Again, the module 1 can be attached upside-down to the napkin 6 such that the additional dielectric layer 10 is facing away from the napkin 6. Optionally, the surface of the module 1 facing away from the napkin 6 can be provided with a comfort layer to enhance comfort of wearing a napkin with a moisture sensing module 1, and to counteract undesired physiological reactions on the skin, such as irritation reactions.
Figure 4 shows a diagram of the resonance frequency of a moisture detecting module as a function of moisture. The diagram D indicates the actual resonance frequency Res [MHz] as a function of moisture [%] in the absorption layer 4 of the module 1. When no moisture is present in the absorption layer 4, the resonance frequency Res has a maximum at circa 8.2 MHz. When moisture has been received in the absorption layer 4, the variable capacitance Cvar increases, thus lowering the resonance frequency Res. The permittivity of the dielectric layer 3 and the thickness of said layer 3 are chosen such that, on the one hand, variation in the resonance frequency is easily detectable by a reading device, while, on the other hand, the resonance frequency is still in a range that is detectable by the reading device, e.g. higher than circa 7.65 MHz. In this context it is noted that the mentioned resonance frequencies are not limiting as other frequencies can be applied as well. It is further noted that the permittivity and the thickness of the dielectric layer 3 are chosen such that the amplitude of the resonance signal is in a range that is detectable by the reader.
It is noted that the moisture sensing module can not only be used in combination with a napkin, but also with other nursing articles wherein a moisture state has to be monitored, e.g. a banding or dressing. In addition, the moisture sensing module can also be used in industrial processes, e.g. for monitoring a sealing, such as a seam or joint of pipe segments, or seals between moisture impermeable plates. Especially, the moisture sensing module can be used in water impermeable plates, underground pipes, sewer draines, pipelines, etc. Advantageously, the moisture sensing module is mounted at a side of a structure that is shielded against ground water, thus measuring the effectiveness of the sealing can be tested. As an example, a moisture sensing module is installed at the inner side of watertight pipes to monitore the water permeability of the pipes. Similarly, a moisture sensing module can be located at the side of a water impermeable plate that should be dry.
The invention is not restricted to the embodiments described herein. It will be understood that many variants are possible.
Optionally, also the additional dielectric layer can be provided with a covering moisture absorbing layer, thereby influencing the actual resonance frequency by a moisture content at both surfaces of the tag layer 2.
Further, an identification can be added to the moisture sensing module rendering a so-called RF-ID tag, enabling identification of the module upon reading it.
Instead of applying a passive resonance circuit, the moisture detecting module can also be provided with an active resonance circuit. Further, the module can be arranged with another transmission element type, such as an active strip antenna.
Further, if it is desired to switch off the resonance circuit externally, a local electromagnetic field may be applied having a relatively high field strength, thereby irreversibly damaging the circuit structure of the coil.
Preferably, the moisture sensing module is reversible, i.e. the resonance characteristics of the sensor are not influenced by an earlier state of the sensor. In particular, when a wet absorption layer becomes dry, the resonance signal is identical or similar to the situation before the absorption layer became wet.
Optionally, the components of the moisture sensing module are stable, so that the module is durable, meaning that its function is reliable during a relatively long period, e.g. more than circa a year or more than circa 10 years.
Other such variants will be apparent for the person skilled in the art and are considered to fall within the scope of the invention as defined in the following claims.

Claims

Claims
1. A moisture sensing module for monitoring an amount of moisture, comprising a tag layer including a passive electrical resonance circuit, a dielectric layer covering the tag layer, and an absorption layer on top of the dielectric layer for receiving the amount of moisture to be monitored.
2. A moisture sensing module according to claim 1, wherein the tag layer, the dielectric layer and the absorption layer form a sandwich structure.
3. A moisture sensing module according to claim 1 or 2, wherein the top surface and the bottom surface of the tag layer are shielded against moisture particles.
4. A moisture sensing module according to any of the preceding claims, further comprising an additional dielectric layer arranged below the tag layer such that the tag layer is sandwiched between the dielectric layer and the additional dielectric layer.
5. A moisture sensing module according to any of the preceding claims, wherein the dielectric layer and/or the additional dielectric layer form a barrier shielding the tag layer against moisture particles.
6. A moisture sensing module according to claim 4 or 5, wherein the capacitance resulting via the dielectric layer is significantly smaller than the capacitance resulting via the additional dielectric layer.
7. A moisture sensing module according to claim 4, 5 or 6, wherein the electrical permittivity of the dielectric layer is smaller than the electrical permittivity of the additional dielectric layer.
8. A moisture sensing module according to any of the preceding claims, wherein the dielectric layer is made from a plastic and/or wherein the additional dielectric layer is made from a foam.
9. A moisture sensing module according to any of the preceding claims, wherein a bottom surface or a top surface of the module is arranged for attachment to a moisture absorbing section of a napkin.
10. A moisture sensing module according to claim 9, wherein the bottom surface or the top surface, respectively, of the module is provided with an adhesive layer for attachment to the moisture absorbing section of the napkin surface.
11. A moisture sensing module according to claim 9 or 10, further comprising a comfort layer forming a top layer or a bottom layer, respectively, of the module.
12. A moisture sensing module according to any of the preceding claims, wherein the resonance circuit comprises a resonant LC-loop.
13. A moisture sensing module according to any of the preceding claims, wherein the resonance circuit includes thin film technology components.
14. A napkin, comprising a moisture absorbing section and a moisture sensing module according to any of the preceding claims 1-13.
PCT/NL2014/050214 2013-04-04 2014-04-04 A moisture sensing module and a napkin WO2014163503A1 (en)

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NL2010569 2013-04-04

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020030139A (en) * 2018-08-23 2020-02-27 株式会社東芝 Moisture detection sensor, moisture detection sensor device, and moisture detection sensor system
EP3653185A4 (en) * 2017-08-14 2020-08-19 Qui Inc. Excreta detection device for diaper and excreta detection reader

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US20040036484A1 (en) * 2002-08-23 2004-02-26 Seiichiro Tamai Liquid detection sensor, liquid detection apparatus and liquid detection system
US20100168702A1 (en) * 2008-12-31 2010-07-01 Ales Iii Thomas Michael Conductor-Less Detection System For An Absorbent Article
WO2010123425A1 (en) * 2009-04-23 2010-10-28 Sca Hygiene Products Ab Article and method for wetness detection
WO2011005096A1 (en) 2009-07-09 2011-01-13 Salusion Ip B.V. A moisture detecting module and a receiving unit
US20120109087A1 (en) * 2010-11-02 2012-05-03 Kimberly-Clark Worldwide, Inc. Body fluid discriminating sensor
US20120216607A1 (en) * 2009-10-07 2012-08-30 Pampett Ab Method and system for detecting moisture at an absorbent article
DE102011076219A1 (en) * 2011-05-20 2012-11-22 TU Chemnitz Arrangement for performing contactless detection of moisture in e.g. commercial diaper, has oscillating circuit directly stitched on or into incontinence material that is releasably arranged on or in support material
US20120310190A1 (en) * 2011-06-03 2012-12-06 Gary Dean Lavon Sensor Systems Comprising Anti-Choking Features

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Publication number Priority date Publication date Assignee Title
US5903222A (en) * 1997-04-03 1999-05-11 Zaggie, Inc. Wet garment detector
US20020145526A1 (en) * 2001-03-30 2002-10-10 Augmentech, Inc. Patient positioning monitoring apparatus and method of use thereof
US20040036484A1 (en) * 2002-08-23 2004-02-26 Seiichiro Tamai Liquid detection sensor, liquid detection apparatus and liquid detection system
US20100168702A1 (en) * 2008-12-31 2010-07-01 Ales Iii Thomas Michael Conductor-Less Detection System For An Absorbent Article
WO2010123425A1 (en) * 2009-04-23 2010-10-28 Sca Hygiene Products Ab Article and method for wetness detection
WO2011005096A1 (en) 2009-07-09 2011-01-13 Salusion Ip B.V. A moisture detecting module and a receiving unit
US20120216607A1 (en) * 2009-10-07 2012-08-30 Pampett Ab Method and system for detecting moisture at an absorbent article
US20120109087A1 (en) * 2010-11-02 2012-05-03 Kimberly-Clark Worldwide, Inc. Body fluid discriminating sensor
DE102011076219A1 (en) * 2011-05-20 2012-11-22 TU Chemnitz Arrangement for performing contactless detection of moisture in e.g. commercial diaper, has oscillating circuit directly stitched on or into incontinence material that is releasably arranged on or in support material
US20120310190A1 (en) * 2011-06-03 2012-12-06 Gary Dean Lavon Sensor Systems Comprising Anti-Choking Features

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3653185A4 (en) * 2017-08-14 2020-08-19 Qui Inc. Excreta detection device for diaper and excreta detection reader
JP2020030139A (en) * 2018-08-23 2020-02-27 株式会社東芝 Moisture detection sensor, moisture detection sensor device, and moisture detection sensor system

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