Wetness radio-frequency sensor for diapers / diaper pants, diapers / diaper pants, and mounting method

Abstract

A wetness radio-frequency sensor (01) for diapers / diaper pants, diapers / diaper pants, and a mounting method. The wetness radio-frequency sensor (01) for diapers / diaper pants comprises a radio-frequency tag body layer, fine sodium chloride particles (1) located at a resonant cavity position of a radio-frequency tag, a tag water-absorbent layer (3), and a moisture-proof protective film (14). After the moisture-proof protective film (14) is peeled off, the wetness radio-frequency sensor (01) for diapers / diaper pants is located inside a diaper / diaper pant (022), and the tag water-absorbent layer (3) of the wetness radio-frequency sensor (01) for diapers / diaper pants faces the inner side of a diaper / diaper pant body. The mounting method comprises the steps: peeling off a moisture-proof protective film (14), inserting one end of a wetness radio-frequency sensor (01) for diapers / diaper pants into a front-end hole (33) of a puncture needle, inserting the puncture needle (31) into the inner side of the front end of a diaper / diaper pant body, advancing the puncture needle (31), pressing the rear end of the wetness radio-frequency sensor (01) for diapers / diaper pants and continuing advancing, withdrawing the puncture needle (31), etc. A diaper / diaper pant provided with the wetness radio-frequency sensor (01) for diapers / diaper pants has a wetness reminder function, high safety and low cost.

Description

A diaper / pants moisture radio frequency sensor, diapers / pants and installation method Technical Field

[0001] This invention relates to the field of radio frequency sensor technology, specifically to a wetness radio frequency sensor for diapers / pants and its application. Background Technology

[0002] Disposable diapers are widely used among bedridden elderly people and infants. If wet diapers are not changed promptly, they can cause bedsores in the elderly or infants. Currently, disposable diapers are checked by the person in charge, but there are inevitably times when checks are not timely.

[0003] Therefore, there is an urgent need for a moisture sensor for diapers or disposable diapers that can notify medical staff or family members to change diapers or disposable diapers in a timely manner. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention provides a radio frequency sensor for the moisture content of diapers / pants and its application.

[0005] The technical solution of this invention is as follows:

[0006] This invention provides a diaper / pants moisture radio frequency sensor, comprising an RFID tag body layer, sodium chloride salt fine particles, a tag absorbent layer, and a moisture-proof protective film. The tag absorbent layer is absorbent paper with a thickness of 0.1 mm to 0.3 mm, and the moisture-proof protective film is a PP protective film with a thickness of 15 micrometers to 25 micrometers.

[0007] The RFID tag body layer includes a PET base film, an RF resonant cavity, an UHF antenna, an RF chip, and a pressure-sensitive adhesive layer. The RF resonant cavity is located on the surface of the PET base film. The UHF antenna and the RF chip are connected to the RF resonant cavity to form an RF resonant cavity assembly. The pressure-sensitive adhesive layer connects the PET base film and the tag absorbent layer.

[0008] The present invention also provides a diaper / pants, including a diaper / pants body, wherein a diaper / pants moisture-proof radio frequency sensor after removing the moisture-proof protective film is located inside the diaper / pants, and the absorbent layer of the label of the diaper / pants moisture-proof radio frequency sensor faces the inside of the diaper / pants body.

[0009] The present invention also provides a method for installing the above-mentioned diaper / pants moisture radio frequency sensor, comprising the following steps:

[0010] S1. Remove the moisture-proof protective film from the surface of the diaper / pants moisture RF sensor;

[0011] S2. Insert one end of the diaper / pants moisture radio frequency sensor into the puncture needle tip hole;

[0012] S3. Insert the puncture needle into the inner front end of the diaper / pants body, and after confirming that the absorbent layer of the label in the diaper / pants water-wet radio frequency sensor faces the inner side of the diaper / pants body, push the puncture needle forward so that the diaper / pants water-wet radio frequency sensor moves forward and extends into the diaper / pants body simultaneously.

[0013] S4. Press and hold the tail end of the diaper / pants moisture radio frequency sensor, and continue to push the puncture needle forward until the front end of the diaper / pants moisture radio frequency sensor leaves the front hole of the puncture needle.

[0014] S5. Remove the puncture needle, leaving the diaper / pant moisture radio frequency sensor inside the diaper / pant.

[0015] After installation and wearing, the diaper / pants moisture RF sensor is paired with the RFID alarm located under the bed. When the diaper / pants moisture RF sensor gets wet, it will not be able to receive a signal from the RFID alarm, and the RFID alarm will send an alarm message to the sound and light display.

[0016] According to the above-described solution, the beneficial effects of this invention are that it enables diapers / pants to have a wetness reminder function, allowing for timely diaper / pants changes. The diaper / pants wetness radio frequency sensor of this invention is embedded within the diaper / pants, avoiding direct contact with the human body, thus improving the wearing comfort of the diapers / pants. Furthermore, this invention uses radio frequency technology instead of electrical signals, ensuring human safety, and providing faster signal acquisition and more sensitive response.

[0017] The diaper / pants moisture radio frequency sensor of the present invention can be installed more quickly and can be implemented without changing the existing structure of diapers / pants. It is low in cost and easy to promote and apply. Attached Figure Description

[0018] Figure 1a is a schematic diagram of the structure of the diaper / pants wet radio frequency sensor with aluminum foil etched ultra-high frequency antenna in this invention.

[0019] Figure 1b is a top view of the diaper / pants wetness radio frequency sensor with aluminum foil etched ultra-high frequency antenna in this invention;

[0020] Figure 1c is a schematic diagram of the aluminum foil etching of the UHF antenna radio frequency tag in this invention;

[0021] Figure 2a is a schematic diagram of the structure of the copper wire ultra-high frequency antenna for the diaper / pants wet radio frequency sensor in this invention.

[0022] Figure 2b is a schematic diagram of the copper wire ultra-high frequency antenna radio frequency tag in this invention;

[0023] Figure 2c is a schematic diagram of the dual-loop radio frequency resonant cavity in this invention;

[0024] Figure 3 is a schematic diagram of the insertion of the puncture needle tip hole into the diaper / pants moisture radio frequency sensor in this invention;

[0025] Figure 4 is a schematic diagram of the puncture method for installing the diaper / pants moisture radio frequency sensor in this invention;

[0026] Figure 5 is a schematic diagram of the application status of the diaper / pants moisture radio frequency sensor in this invention.

[0027] In the figure, the labels for each item are as follows:

[0028] 01. Diaper / pants moisture radio frequency sensor; 021. Diaper / pants inner layer waterproof membrane; 022. Diaper / pants interior; 023. Diaper / pants outer layer waterproof membrane; 03. Bedding; 04. Radio frequency identification alarm;

[0029] 1. Fine sodium chloride particles; 2. Pressure-sensitive adhesive layer; 3. Label absorbent layer;

[0030] 11. Aluminum foil etched antenna PET base film; 12. Aluminum foil etched ultra-high frequency antenna; 13. RF chip; 14. Moisture-proof protective film;

[0031] 21. Copper wire antenna PET base film; 22. Copper wire UHF antenna; 23. Dual-loop RF resonant cavity; 231. Inner ring aluminum foil; 232. Outer ring aluminum foil; 233. Chip coupling point; 234. Antenna coupling point;

[0032] 31. Puncture needle; 32. Puncture needle tip; 33. Puncture needle front hole. Detailed Implementation

[0033] The present invention will now be further described with reference to the accompanying drawings and embodiments:

[0034] As shown in Figures 1a to 2b, the present invention provides a diaper / pants wetness radio frequency sensor, which uses an ultra-high frequency radio frequency signal as the transmission signal to promptly remind people to change the diaper / pants when they become wet.

[0035] The diaper / pants moisture radio frequency sensor includes an RFID tag body layer, sodium chloride fine particles 1, a tag absorbent layer 3, and a moisture-proof protective film 14. The RFID tag body layer provides basic radio frequency functions, the sodium chloride fine particles 1 are used to control the radio frequency signal according to the moisture level, the tag absorbent layer 3 is used for water absorption, and the moisture-proof protective film 14 can prevent the sodium chloride fine particles 2 from getting damp.

[0036] 1. Radio Frequency Tag Body Layer

[0037] The RFID tag body layer is used to transmit and receive radio frequency signals. Its overall shape is long and narrow, which makes the RFID tag small in size and increases the transmission distance of radio frequency signals while ensuring signal sensitivity.

[0038] The RFID tag body includes a PET base film, an ultra-high frequency antenna, an RFID resonant cavity, an RFID chip 13, and a pressure-sensitive adhesive layer 2. The RFID resonant cavity is located on the surface of the PET base film. The ultra-high frequency antenna and the RFID chip 12 are both connected to the RFID resonant cavity to form an RFID resonant cavity assembly. The pressure-sensitive adhesive layer 2 is used to connect the PET base film and the tag absorbent layer 3.

[0039] In this invention, the UHF channel is located between 860MHz and 960MHz, and the UHF antenna can be an aluminum foil etched UHF antenna or a copper wire UHF antenna.

[0040] (1) Aluminum foil etched ultra-high frequency antenna

[0041] As shown in Figures 1a to 1c, both the radio frequency resonant cavity and the aluminum foil-etched ultra-high frequency antenna 12 are formed by etching the aluminum foil of the PET substrate. Specifically, the surface of the PET substrate 11 for the aluminum foil-etched antenna is provided with an aluminum foil layer, which is etched to form the radio frequency resonant cavity and the aluminum foil-etched ultra-high frequency antenna 12. As shown in Figure 1c, the radio frequency resonant cavity is a ring circuit with an opening. The radio frequency chip 13 is connected to the chip coupling position of the ring circuit. One side of the ring circuit opposite to the radio frequency chip 13 extends to the left and right to form antenna wings (i.e., the aluminum foil-etched ultra-high frequency antenna 12) to enhance the radio frequency signal strength.

[0042] In this configuration, the pressure-sensitive adhesive layer 2 is located on the surface of the RF chip 12, connected to the aluminum foil etched antenna PET substrate 11, and serves to surround the RF chip 13 and the aluminum foil etched ultra-high frequency antenna 12 between the pressure-sensitive adhesive layer 2 and the aluminum foil etched antenna PET substrate 11. Fine sodium chloride particles 1 are located between the pressure-sensitive adhesive layer 2 and the RF resonant cavity (aluminum foil etched ultra-high frequency antenna 12), allowing the pressure-sensitive adhesive layer 2 to connect to the aluminum foil etched antenna PET substrate 11 while simultaneously encapsulating the fine sodium chloride particles 1.

[0043] (2) Copper wire UHF antenna

[0044] As shown in Figures 2a to 2c, the copper wire UHF antenna 22 is formed by bending copper wire, and the copper wire is connected to the antenna coupling position 234 of the dual-loop RF resonant cavity 23 to realize the function of antenna data transmission. Specifically, the dual-loop RF resonant cavity 12 and the copper wire UHF antenna 22 are bonded to the pressure-sensitive adhesive layer 2, and the sodium chloride fine particles 1 are located at the position of the dual-loop RF resonant cavity 12.

[0045] In this method, the pressure-sensitive adhesive layer 2 is located below the dual-loop RF resonant cavity 23 and the copper wire UHF antenna 22, which can simultaneously adhere the dual-loop RF resonant cavity 23, the copper wire UHF antenna 22, and the sodium chloride fine particles 1 to their surfaces, thus fixing the three together. Another pressure-sensitive adhesive layer is also provided above the dual-loop RF resonant cavity 23, the copper wire UHF antenna 22, and the sodium chloride fine particles 1. The label absorbent layer 3 is located on the surfaces of the dual-loop RF resonant cavity 23, the copper wire UHF antenna 22, and the sodium chloride fine particles 1, connecting them and simultaneously bonding the label absorbent layer.

[0046] Preferably, the copper wire diameter is 0.05 mm to 0.08 mm, and the resistance per meter of copper wire is less than 7.5 ohms. The shape of the copper wire UHF antenna 22 can be linear, sinusoidal, square, triangular, trapezoidal, serrated, or mixed. A mixed waveform refers to a shape formed by connecting any two or more of the above shapes, such as a segment of linear, a segment of sinusoidal, and so on.

[0047] In this embodiment, the dual-ring RF resonant cavity 23 includes an inner ring aluminum foil 231 and an outer ring aluminum foil 232 formed by etching aluminum foil. The openings of the inner ring aluminum foil 231 and the outer ring aluminum foil 232 are located at one point to form a chip coupling position 233 for connection with the RF chip 13. The outer ring aluminum foil 232 on the side opposite to the mounting position of the RF chip 13 is provided with an antenna coupling position 234, which allows it to couple with the copper wire UHF antenna 22. Meanwhile, the package pins of the RF chip 13 include two package balance pins and two package pins, and the two package balance pins are connected by a jumper wire. One package balance pin is connected to one end of the inner ring aluminum foil 231, the other package balance pin is connected to one end of the outer ring aluminum foil 232, one package pin is connected to the other end of the inner ring aluminum foil 231, and the other package pin is connected to the other end of the outer ring aluminum foil 232. The RF chip 13 is fixed to the endpoint of the dual-ring RF resonant cavity 23 by conductive resin. The inner ring aluminum foil and the outer ring aluminum foil are connected in series by a short circuit between the package balance pins. The two package pins of the RF chip 13 and the inductors connected in series with the inner ring aluminum foil and the outer ring aluminum foil form the dual-ring RF resonant cavity assembly.

[0048] 2. Fine particles of sodium chloride salt

[0049] The sodium chloride fine particles 1 are disposed within the body layer of the RFID tag and located in the resonant cavity of the RFID tag, so that changes in the state of the sodium chloride fine particles 1 can directly affect the RF performance of the RF resonant cavity. In addition, the sodium chloride fine particles 1 are low in cost and will not cause harm to the human body.

[0050] 3. Label absorbent layer

[0051] The label absorbent layer 3 is located on the surface of the RFID tag body layer. It is connected to the pressure-sensitive adhesive layer 2 of the RFID tag body layer for fixation and also covers the sodium chloride fine particles 1. The sodium chloride fine particles 1 are in direct contact with the label absorbent layer 3, thereby causing the sodium chloride fine particles 1 to change state according to the moisture content of the label absorbent layer 3.

[0052] The label absorbent layer 3 of the present invention uses absorbent paper with a thickness of 0.1 mm to 0.3 mm.

[0053] 4. Moisture-proof protective film

[0054] A moisture-proof protective film 14 is located on the surface of the label absorbent layer 3. When using the diaper / pants moisture RF sensor, the moisture-proof protective film 14 needs to be removed. The moisture-proof protective film 14 is a PP protective film with a thickness of 15 microns to 25 microns. It covers the surface of the label absorbent layer 3 to prevent fine sodium chloride particles from getting damp in humid weather.

[0055] As shown in Figure 3, the present invention also provides a diaper / pants using a diaper / pants moisture radio frequency sensor, including a diaper / pants body, the inner side of the diaper / pants body being an inner layer water-permeable membrane 021, and the outer side being an outer layer waterproof membrane 022.

[0056] After removing the moisture-proof protective film, the diaper / pants moisture RF sensor is located inside the diaper / pants (022), and the label absorbent layer of the diaper / pants moisture RF sensor faces the inside of the diaper / pants body, which allows the label absorbent layer to detect moisture as quickly as possible for RF response.

[0057] After removing the moisture-proof protective film, the diaper / pants moisture-sensing radio frequency sensor is inserted into the diaper / pants body through a puncture needle 31. The puncture needle 31 has a puncture needle tip 32 at its front end and a puncture needle front hole 33 at its rear side. During installation, the diaper / pants moisture-sensing radio frequency sensor 01 is first passed through the puncture needle front hole 33, and then the puncture needle 31 is used to drive the diaper / pants moisture-sensing radio frequency sensor 01 into the diaper / pants interior 022.

[0058] As shown in Figures 3 and 4, the present invention also provides a method for installing a radio frequency sensor for the moisture content of diapers / pants, comprising the following steps:

[0059] 1. Remove the moisture-proof protective film from the surface of the diaper / pants moisture RF sensor 01.

[0060] 2. Using the tip 32 of the puncture needle, insert one end of the diaper / pants moisture radio frequency sensor 01 into the puncture needle tip hole.

[0061] 3. Insert the puncture needle 31 into the inner front side of the diaper / pants body (on the side of the inner layer absorbent membrane 021 of the diaper / pants), and after confirming that the absorbent layer of the label in the diaper / pants moisture radio frequency sensor 01 is facing the inner side of the diaper / pants body, push the puncture needle 31 forward (the pushing distance is approximately 80 mm according to the length of the diaper / pants moisture radio frequency sensor 01), so that the diaper / pants moisture radio frequency sensor 01 moves forward synchronously and extends into the diaper / pants body.

[0062] 4. Press and hold the tail end of the diaper / pants moisture radio frequency sensor 01 (right side in Figure 3), and continue to advance the puncture needle 31 forward (the advance distance is approximately 20 mm to 30 mm depending on the length of the diaper / pants moisture radio frequency sensor 01 extending into the puncture needle front end hole 33), until the front end of the diaper / pants moisture radio frequency sensor 01 leaves the puncture needle front end hole 33.

[0063] 5. Remove the puncture needle 31, leaving the diaper / pants moisture radio frequency sensor 01 inside the diaper / pants.

[0064] After being installed and worn on the human body, the diaper / pants wetness radio frequency sensor is paired with the radio frequency identification alarm 04 located under the bed 03. When the diaper / pants wetness radio frequency sensor 01 becomes wet, it can no longer receive a signal from the radio frequency identification alarm 04. The radio frequency identification alarm 04 sends an alarm message to the sound and light display, and the sound and light display in the hall or duty room will sound an alarm to remind others to change the diaper / pants.

[0065] After installing the diaper / pants moisture RF sensor, the sensor can be calibrated. The specific steps are as follows:

[0066] 1. Place the diaper / pants in the middle of the bed 03, so that it corresponds to the position of the body when lying flat or on its side.

[0067] 2. Turn on the power of the RFID alarm 04. The green light of the RFID alarm 04 will light up, indicating that it is working normally and can read the radio frequency signal of the diaper / pants moisture radio frequency sensor 01, which indicates that the diaper / pants is not wet.

[0068] 3. Cover the diaper / pants moisture RFID sensor 01 with both hands to significantly reduce its RFID tag sensitivity, or hold the diaper / pants and raise it more than 40 cm high to make it difficult for the RFID alarm 04 to read its RFID signal. This indicates that the RFID tag is malfunctioning and that the diaper / pants is wet. At this time, because the RFID alarm 04 cannot read the RFID signal of the diaper / pants moisture RFID sensor 01, it will trigger an alarm signal.

[0069] If the alarm signal is triggered, it indicates that the diaper / pants moisture RF sensor 01 is working properly.

[0070] The working principle of the diaper / pants moisture radio frequency sensor in this invention is as follows:

[0071] 1) The dielectric constant of the radio frequency resonant cavity in the diaper / pants moisture RF sensor determines the reading sensitivity of the RFID tag. When sodium chloride salts are in a solid state, their dielectric constant is small. When they are located in the radio frequency resonant cavity, the solid sodium chloride salts have little impact on the reading sensitivity of the RFID tag, and the RFID tag can work normally. However, when sodium chloride salts come into contact with water, they change from solid to liquid, exhibiting conductive properties and a significant increase in dielectric constant. When they are located in the radio frequency resonant cavity, the liquid sodium chloride salts cause a significant decrease in the reading sensitivity of the RFID tag, rendering it ineffective for radio frequency operation.

[0072] 2) Due to the failure of the radio frequency tag function of the diaper / pants moisture radio frequency sensor, the radio frequency reader (i.e., the radio frequency identification alarm located under the bed) cannot read the radio frequency signal, and its output changes from low level to high level, triggering an alarm signal; at the same time, it can also be linked with the sound and light display in the hall or duty room to make it sound and light alarm, reminding people to change the diaper / pants.

[0073] During normal use: When a child, elderly person, or paralyzed patient wears a diaper / pants, if the diaper / pants gets wet, the moisture enters the radio frequency resonant cavity through the absorbent layer of the tag. The fine particles of sodium chloride dissolve, causing a significant increase in the dielectric constant of the sodium chloride solution. This significantly reduces the sensitivity of the RFID tag, causing it to malfunction, resulting in no RFID signal or the RFID alarm 04 being unable to recognize the signal, thus triggering a high-level alarm signal.

[0074] The diaper / pants moisture radio frequency sensor in this invention, i.e., the functional features of the diaper / pants, includes:

[0075] (1) The diaper / pants moisture radio frequency sensor is located inside the diaper / pants body and does not come into direct contact with people, which is comfortable.

[0076] (2) The diaper / pants moisture radio frequency sensor does not require power supply, has no wires, and no current flows through it, making it safe.

[0077] (3) The RFID sensor for diaper / pants moisture content is easier and faster to install on the diaper / pants body.

[0078] (4) The diaper / pants moisture radio frequency sensor has a fast response speed and can output an alarm signal within three minutes of being wet.

[0079] (5) The diaper / pants moisture radio frequency sensor is small in size, inexpensive, and easy to widely promote and apply.

[0080] (6) The existing diaper / pants structure can be changed without directly installing the diaper / pants moisture radio frequency sensor.

Claims

1. A radio frequency sensor for the moisture content of diapers / pants, characterized in that, include: The RFID tag body layer is used to transmit and receive radio frequency signals; Fine sodium chloride particles are disposed within the body layer of the RFID tag and located in the resonant cavity of the RFID tag; The tag absorbent layer is located on the surface of the RFID tag body layer. And a moisture-proof protective film, which is located on the surface of the label's absorbent layer.

2. The diaper / pants moisture radio frequency sensor according to claim 1, characterized in that, The RFID tag body layer includes a PET base film, an RFID resonant cavity, an UHF antenna, an RFID chip, and a pressure-sensitive adhesive layer. The RFID resonant cavity is located on the surface of the PET base film. The UHF antenna and the RFID chip are both connected to the RFID resonant cavity to form an RFID resonant cavity assembly. The pressure-sensitive adhesive layer is used to connect the PET base film and the tag absorbent layer.

3. The diaper / pants moisture radio frequency sensor according to claim 2, characterized in that, The surface of the PET base film is provided with an aluminum foil layer, which is etched to form the ultra-high frequency antenna and the radio frequency resonant cavity.

4. The diaper / pants moisture radio frequency sensor according to claim 2, characterized in that, The ultra-high frequency antenna is formed by bending copper wire, and the copper wire is pasted on the inner side of the pressure-sensitive adhesive layer and coupled to the antenna coupling position of the radio frequency resonant cavity.

5. The diaper / pants moisture radio frequency sensor according to claim 1, characterized in that, The label's absorbent layer is absorbent paper, and the thickness of the absorbent paper is 0.1 mm to 0.3 mm.

6. The diaper / pants moisture radio frequency sensor according to claim 1, characterized in that, The thickness of the moisture-proof protective film is 15 micrometers to 25 micrometers.

7. A diaper / pants using the diaper / pants moisture radio frequency sensor according to any one of claims 1-6, characterized in that, The diaper / pants body includes a moisture-proof radio frequency sensor located inside the diaper / pants after the moisture-proof protective film is removed, with the absorbent layer of the label of the moisture-proof radio frequency sensor facing the inside of the diaper / pants body.

8. The diaper / pants according to claim 7, characterized in that, After the moisture-proof protective film is removed, the diaper / pants moisture radio frequency sensor is inserted into the interior of the diaper / pants body through a puncture needle.

9. A method for installing a radio frequency sensor for diaper / pants moisture as described in any one of claims 1-6, characterized in that, Includes the following steps: S1. Remove the moisture-proof protective film from the surface of the diaper / pants moisture RF sensor; S2. Insert one end of the diaper / pants moisture radio frequency sensor into the puncture needle tip hole; S3. Insert a puncture needle into the inner front end of the diaper / pants body, and after confirming that the absorbent layer of the label in the diaper / pants water-wet radio frequency sensor faces the inner side of the diaper / pants body, push the puncture needle forward so that the diaper / pants water-wet radio frequency sensor moves forward synchronously and extends into the diaper / pants body. S4. Press and hold the tail end of the diaper / pants moisture radio frequency sensor, and continue to push the puncture needle forward until the front end of the diaper / pants moisture radio frequency sensor leaves the front hole of the puncture needle. S5. Remove the puncture needle so that the diaper / pants moisture radio frequency sensor remains inside the diaper / pants body.

10. The method for installing the diaper / pants moisture radio frequency sensor according to claim 9, characterized in that, After being installed and worn on the human body, the diaper / pants moisture radio frequency sensor is paired with an RFID alarm located under the bed. When the diaper / pants moisture radio frequency sensor gets wet, it can no longer enable the RFID alarm to receive signals, and the RFID alarm sends alarm information to the audio-visual display.

Images