CN107981984B - Intelligent diaper with multiple induction points and diaper saturation reminding function and monitoring method thereof - Google Patents

Abstract

The invention discloses an intelligent diaper with multiple induction points and a diaper saturation reminding function and a monitoring method thereof. The detection electrode is arranged on the hollowed-out substrate, each group of detection electrodes comprises a pair of induction electrodes, each pair of induction electrodes comprises two metal electrodes which are arranged on the upper surface and the lower surface of the substrate and are mutually conducted, and therefore the detection electrodes face the surface of the skin of the infant and face the diaper inwards respectively; when defecation occurs, the multiplexing unit collects the resistance value between the induction electrodes, judges whether the defecation occurs or not or the diaper is saturated according to the change of the resistance value within a period of time, and reminds the diaper to replace the urine, the hollowed-out substrate is adopted, so that the air permeability of the electrode plate is realized, the diaper can rapidly absorb the defecation, and the comfort level of a baby is improved; the defecation reminding device has the function of judging defecation, and can realize the reminding function aiming at the defecation or diaper saturation.

Description

Intelligent diaper with multiple induction points and diaper saturation reminding function and monitoring method thereof

Technical Field

The invention relates to an intelligent diaper, in particular to an intelligent diaper with multiple sensing points and a diaper saturation reminding function and a monitoring method thereof.

Background

Because the traditional diaper is frequently changed, the cleaning amount is large, the skin of a baby is easy to soak in urine stains and feces stains carelessly, the cleaning and airing conditions are not good, and bacteria are easy to breed. Disposable diapers are produced in the future and are becoming more and more popular with young parents. Many times, adults often forget to change diapers for babies due to negligence or other reasons, and these factors can harm the health of the babies. The intelligent paper diaper meets the market demand.

The existing intelligent diaper adopts a pair of sensing electrodes with a certain distance to be placed in a sensing area, whether defecation occurs or not is judged within a set threshold range by detecting the resistance value of the sensing electrodes, and the principle is similar to that of a raindrop sensor. The change of the resistance value of the induction electrode means the humidity change of the electrode environment, so another humidity detection mode is to directly adopt a humidity sensor and detect whether defecation exists or not by combining the humidity sensor with the temperature change. However, the existing method can only detect whether the defecation exists or not, and cannot analyze the defecation quantity; and has no ability to distinguish between urination and defecation, which may not be detected if the infant merely defecates; the humidity sensor is combined with the temperature sensor, so that false alarm or false alarm can be easily generated. Moreover, the induction electrode is arranged on the whole substrate, so that the air permeability is poor, and the skin of the baby is greatly damaged.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides an intelligent diaper with multiple sensing points and a diaper saturation reminding function and a monitoring method thereof.

The invention aims to provide an intelligent diaper with multiple sensing points and a diaper saturation reminding function.

The intelligent diaper with the multiple sensing points and the diaper saturation reminding function comprises: the device comprises a substrate, a plurality of groups of detection electrodes and a multiplexing unit; the surface of the substrate is distributed with a plurality of groups of detection electrodes from front to back to form a sensing structure, and each group of detection electrodes comprises two independent sensing electrodes; the substrate is discontinuous, and gaps are formed among the induction electrodes to form a hollow or strip-shaped structure; each induction electrode comprises two metal electrodes which are respectively arranged on the upper surface and the lower surface of the substrate, and the two metal electrodes of the same induction electrode are mutually conducted; the sensing structure is arranged on the surface, attached to the skin, of the diaper, a plurality of groups of detection electrodes are distributed from front to back along the central axis of the diaper, and two metal electrodes of each sensing electrode face the skin outwards and face the diaper inwards respectively; laying an insulating and water-permeable surface layer on the surface of the plurality of groups of detection electrodes facing the diaper and attached to the skin of the baby; each induction electrode is connected to the multiplexing unit through a lead respectively; the multiplexing unit is arranged at a position where the surface of the diaper faces the abdomen of the baby and does not influence the movement of the baby; every two induction electrodes of the multiplex unit selection detection electrode form a detection electrode pair, and each detection electrode pair is connected to a single channel of the multiplex unit; when defecation occurs, the resistance value between a pair of sensing electrodes in the pair of sensing electrodes is changed and is transmitted to the multiplexing unit through the lead; the multiplexing unit judges whether defecating is performed or not and whether the defecating is performed or not or the diaper is saturated or not according to the resistance value and the change condition within a period of time, and transmits the result to the external equipment.

The multiplexing unit includes: a switching circuit, a signal processing circuit, an A/D converter, a processor and a communication circuit; each induction electrode is connected to the switching circuit of the multiplexing unit through a lead respectively; the processor selects two sensing electrodes in each group of sensing electrodes to form a sensing electrode pair, and controls the switching circuit to connect the two sensing electrodes in the same group to an independent channel of the signal processing circuit of the multiplexing unit; or the processor selects one induction electrode from each two adjacent groups of detection electrodes to form a detection electrode pair, and controls the switching circuit to connect the two corresponding induction electrodes in the two adjacent groups of detection electrodes to an independent channel of the signal processing circuit of the multiplexing unit; when defecation occurs, the resistance value between two sensing electrodes in the detection electrode pair is changed, the signal processing circuit adopts a preprocessing circuit formed by an analog operational amplifier, the input signal and the output signal of the preprocessing circuit are in a function relation of proportion, logarithm or exponent, and the output signal of the preprocessing circuit is transmitted to an A/D converter; the A/D converter converts the analog signal into a digital signal and transmits the digital signal to the processor; the processor obtains a resistance value through calculation according to the digital signal value of the A/D converter, judges whether defecating exists or not according to the resistance value, and judges whether defecating exists or the diaper is saturated or not according to the change condition of the resistance value within a period of time; the processor is connected to a communication circuit, which delivers the results to an external device.

Each induction electrode comprises two mutually conducted metal electrodes which respectively face the skin outwards and the diaper inwards, the metal electrode facing the skin can judge whether the diaper is saturated or not and whether the diaper is defecated or urinated or not, and the metal electrode facing the diaper inwards can judge whether the diaper is saturated or not. The two metal electrodes are conducted with each other by punching the two metal electrodes and the substrate between the two metal electrodes and filling the two metal electrodes with a conductive material, so that the two metal electrodes are conducted with each other; or the two metal electrodes are electrically connected, so that the two metal electrodes are mutually conducted.

The multiplexing unit is in a small, exquisite and light shape, the switching circuit, the signal processing circuit, the A/D converter, the processor and the communication circuit are integrated on a high-density circuit board, and a shell is sleeved outside the circuit board.

The external equipment is a mobile phone or a repeater; the multiplexing unit is connected with the mobile phone or the repeater in a Bluetooth mode, or the multiplexing unit is connected with the repeater through wireless connection technologies such as Zigbee, 6LowPAN or Lora, and the mobile phone or the repeater is accessed to the Internet through wireless fidelity (WIFI) or a mobile network; or the multiplexing unit directly accesses the Internet in a narrow-band Internet of things NB-IoT mode based on WIFI and honeycomb. Through the network, the guardian remotely inquires various related information of the baby to know the real-time condition of the baby.

The position of the multiplexing unit does not influence the comfort of the baby as much as possible, the multiplexing unit is arranged on the diaper facing the baby belly, and the multiplexing unit is clamped between the diaper and the baby belly after the diaper is worn.

The insulating water-permeable surface layer is made of cotton material.

The sensing structure is externally arranged on the surface of the diaper or is internally arranged in the diaper; in the peripheral mode, the sensing structure is arranged on the surface of the diaper, which is attached to the skin, and the surface of the detection electrode is paved with an insulating and water-permeable surface layer; in the built-in mode, a sensing structure is arranged in a flow guide layer of the diaper, and insulating water-permeable surface layers are arranged on the surfaces of a plurality of groups of sensing electrodes on the flow guide layer.

The size of the substrate hollow is 0.1-40 mm; the multiple groups of detection electrodes are prepared on the substrate in a photoetching, compression joint, printing or corrosion mode.

The multiple groups of detection electrodes can be designed in different arrangement modes according to different babies of men and women. The density of the detection electrode at the front position is designed to be higher for the boy baby, so that a small amount of urination can be more sensitively monitored, the density of the detection electrode at the middle part and the rear part is designed to be lower, materials are saved under the condition that the situation that the male baby does not miss reports is ensured, and the cost and the design difficulty are reduced. By the same token, the detection electrodes at two ends are designed for the treasure for women to have low density, and the detection electrodes at the middle position are designed to have high density.

In addition, the density of the detection electrode is directly related to the lower limit of urine volume for triggering alarm. Denser electrodes may have better sensitivity but may cause problems with excessive wiring; sparser electrodes may reduce the number of wires, but may miss reports when urine volume is too low. Therefore, the electrodes are arranged in a non-uniform distribution mode, so that the defecation detection sensitivity is high while the number of connecting wires is small.

The invention further aims to provide a monitoring method of the intelligent diaper with the diaper saturation reminding function at multiple sensing points.

The invention discloses a monitoring method of an intelligent diaper with multiple sensing points and a diaper saturation reminding function, which comprises the following steps:

1) a plurality of groups of detection electrodes are distributed on the surface of the substrate from front to back to form a sensing structure, each group of detection electrodes comprises two independent induction electrodes, the substrate is discontinuous, and a gap is formed between every two induction electrodes to form a hollow or strip-shaped structure; each induction electrode comprises two metal electrodes which are respectively arranged on the upper surface and the lower surface of the substrate, and the two metal electrodes of the same induction electrode are mutually conducted; the sensing structure is arranged on the surface of the diaper, which is attached to the skin, a plurality of groups of detection electrodes are distributed from front to back along the central axis of the diaper, two metal electrodes of each sensing electrode respectively face the skin outwards and face the diaper inwards, an insulating water-permeable surface layer is tiled on the surface of the plurality of groups of detection electrodes, which faces the diaper and is attached to the skin of the baby, and each sensing electrode is connected to the multiplexing unit through a lead;

2) the multiplexing unit is arranged at a position where the surface of the diaper faces the abdomen of the baby and does not influence the movement of the baby;

3) the multiplexing unit selects every two induction electrodes to form a detection electrode pair, and each detection electrode pair is respectively connected to an independent channel of the multiplexing unit;

4) when defecation occurs, the resistance value between a pair of sensing electrodes in the pair of sensing electrodes is changed and is transmitted to the multiplexing unit through the lead;

5) the multiplexing unit obtains a resistance value through calculation, judges whether the excrement is discharged or not, judges whether the excrement is discharged or whether the diaper is saturated or not according to the change condition of the resistance value within a period of time, and transmits the result to external equipment; if the diaper is judged to be defecated or saturated, a diaper change prompt is sent.

In step 3), the processor selects two sensing electrodes in each group of sensing electrodes to form a sensing electrode pair, and controls the switching circuit to connect the two sensing electrodes in the same group to an independent channel of the signal processing circuit of the multiplexing unit; or the processor selects one sensing electrode from each two adjacent groups of sensing electrodes to form a sensing electrode pair, and controls the switching circuit to connect the two sensing electrodes corresponding to the two adjacent groups of sensing electrodes to an independent channel of the signal processing circuit of the multiplexing unit.

In step 5), the resistance value between two induction electrodes in the detection electrode pair is changed, the signal processing circuit adopts a preprocessing circuit formed by an analog operational amplifier, the input signal and the output signal of the preprocessing circuit are in a function relation of proportion, logarithm or exponent, and the output signal of the preprocessing circuit is transmitted to the A/D converter; the A/D converter converts the analog signal into a digital signal and transmits the digital signal to the processor; the processor obtains a resistance value through calculation according to the digital signal value of the A/D converter, judges whether the patient defecates and whether the patient defecates or urinates, and judges whether the patient defecates or whether the diaper is saturated according to the change condition of the resistance value within a period of time; the processor is connected to a communication circuit, which delivers the results to an external device.

In step 5), the processor judges whether the diaper is defecated or not, and the method specifically comprises the following steps:

a) the processor continuously records resistance value data between two induction electrodes of one detection electrode pair within a period of time, wherein the period of time is 1 s-10 min;

b) finding out the maximum value, the minimum value, the average value and the root mean square value of the resistance value data in the period of time as reference data;

c) selecting a time window for defecation judgment, and finding out the maximum value and the minimum value of resistance value data in the time window, wherein the time window is 1-10 seconds;

d) calculating a slope according to the maximum value and the minimum value in the time window, thereby obtaining the change rate of the resistance value;

e) judging whether defecation occurs or not according to the change rate of the resistance value, if the change rate exceeds a defecation threshold value, judging that the defecation occurs, and if the change rate does not exceed the defecation threshold value, judging that the defecation does not occur;

f) and judging whether the excrement or the diaper is saturated or not according to the retention time of the resistance value at the excrement threshold, if the retention time exceeds the retention threshold, judging that the excrement or the diaper is saturated, and if not, judging that the urine is urine.

Wherein, in the step e), the defecation threshold value is 10-30% of the total measuring range of the A/D converter.

In step f), the threshold value is maintained for 30s to 30 min.

The invention adopts the structure that the front surface and the back surface of the detection electrode are respectively provided with the metal electrodes which respectively face the skin outwards and face the diaper inwards, thereby not only detecting whether defecation occurs, but also further monitoring whether the diaper is saturated. When the feces or the diaper is saturated and the resistance values between the sensing electrodes of the sensing electrode pair are both within the retention time of the defecation threshold, although the feces or the diaper is not distinguished, the diaper replacement needs to be reminded in both cases, so that the comfort of the infant is improved.

The invention has the advantages that:

the invention adopts the technical scheme that a plurality of groups of detection electrodes are arranged on a hollowed-out substrate, each group of detection electrodes comprises a pair of induction electrodes, each pair of induction electrodes comprises two metal electrodes which are arranged on the upper surface and the lower surface of the substrate and are mutually conducted, and thus the detection electrodes respectively face the surface of the skin of a baby outwards and face the diaper inwards; when defecation occurs, the multiplexing unit collects the resistance value between the induction electrodes, judges whether the defecation occurs or not or the diaper is saturated or not according to the change of the resistance value within a period of time, and reminds to replace the diaper; the invention adopts the hollowed-out substrate, realizes the air permeability of the electrode slice, is beneficial to the rapid absorption of the diaper on the excrement and urine, and is also beneficial to improving the comfort level of the infant; the multifunctional bed pan has the function of judging defecation, and can realize the function of reminding replacement aiming at the defecation or diaper saturation.

Drawings

FIG. 1 is a block diagram of an intelligent diaper with multiple sensing points and a diaper saturation reminding function according to the invention;

FIGS. 2(a) - (c) are schematic diagrams of various embodiments of multiple sets of detection electrodes of the intelligent diaper with multiple sensing points and diaper saturation reminding function according to the invention;

fig. 3 is a flowchart of a monitoring method of an intelligent diaper with a diaper saturation reminding function at multiple sensing points according to the invention.

Detailed Description

The invention will be further elucidated by means of specific embodiments in the following with reference to the drawing.

Example one

In this embodiment, the set of detecting electrodes includes two sensing electrodes independent of each other.

As shown in fig. 1, the intelligent diaper with multiple sensing points and diaper saturation reminding function of the embodiment includes: the device comprises a substrate, a plurality of groups of detection electrodes and a multiplexing unit; the surface of the substrate is distributed with a plurality of groups of detection electrodes from front to back to form a sensing structure, and each group of detection electrodes comprises two independent sensing electrodes; the substrate is discontinuous, and gaps are formed among the induction electrodes to form a hollow or strip-shaped structure; each induction electrode comprises two metal electrodes which are respectively arranged on the upper surface and the lower surface of the substrate, and the two metal electrodes of the same induction electrode are mutually conducted; the sensing structure is arranged on the surface, attached to the skin, of the diaper, a plurality of groups of detection electrodes are distributed from front to back along the central axis of the diaper, and two metal electrodes of each sensing electrode face the skin outwards and face the diaper inwards respectively; laying an insulating and water-permeable surface layer on the surface of the plurality of groups of detection electrodes facing the diaper and attached to the skin of the baby; each induction electrode is connected to the multiplexing unit through a lead respectively; the multiplexing unit is arranged at the position where the surface of the diaper faces the abdomen of the baby and does not influence the movement of the baby.

The multiplexing unit includes: switching circuit, signal processing circuit, A/D converter, treater and communication circuit.

The multiplexing unit is small and light, and has a size of 40 × 25 × 5mm in this embodiment.

As shown in fig. 2(a), three sets of detection electrodes are provided, each set of detection electrodes includes two independent and relatively parallel strip-shaped sensing electrodes, forming a detection electrode pair. Alternatively, as shown in fig. 2(b), 8 sets of sensing electrodes are provided, each set of sensing electrodes comprising two separate sensing electrodes of complementary shape. Alternatively, as shown in fig. 2(c), in the present embodiment, 2 sets of detection electrodes are provided, and each set of detection electrodes includes two independent sensing electrodes that are interlaced with each other.

The monitoring method of the intelligent diaper with the multiple sensing points and the diaper saturation reminding function in the embodiment is shown in fig. 3 and comprises the following steps:

1) a plurality of groups of detection electrodes are distributed on the surface of the substrate from front to back to form a sensing structure, each group of detection electrodes comprises two independent induction electrodes, the substrate is discontinuous, and a gap is formed between every two induction electrodes to form a hollow or strip-shaped structure; each induction electrode comprises two metal electrodes which are respectively arranged on the upper surface and the lower surface of the substrate, and the two metal electrodes of the same induction electrode are mutually conducted; the sensing structure is arranged on the surface of the diaper, which is attached to the skin, a plurality of groups of detection electrodes are distributed from front to back along the central axis of the diaper, two metal electrodes of each sensing electrode respectively face the skin outwards and face the diaper inwards, an insulating water-permeable surface layer is tiled on the surface of the plurality of groups of detection electrodes, which faces the diaper and is attached to the skin of the baby, and each sensing electrode is connected to the multiplexing unit through a lead;

2) the multiplexing unit is arranged at a position where the surface of the diaper faces the abdomen of the baby and does not influence the movement of the baby;

3) the processor selects two sensing electrodes in each group of sensing electrodes to form a sensing electrode pair, and controls the switching circuit to connect the two sensing electrodes in the same group to an independent channel of the signal processing circuit of the multiplexing unit; or the processor selects one induction electrode from each two adjacent groups of detection electrodes to form a detection electrode pair, and controls the switching circuit to connect the two corresponding induction electrodes in the two adjacent groups of detection electrodes to an independent channel of the signal processing circuit of the multiplexing unit;

4) when defecation occurs, the resistance value between a pair of sensing electrodes in the pair of sensing electrodes is changed and is transmitted to the multiplexing unit through the lead;

5) the multiplexing unit judges whether defecating is performed or not by calculating the resistance value and judges whether defecating is performed or whether the diaper is saturated or not, and the method comprises the following steps of:

a) the processor continuously records the resistance value data between two induction electrodes of one defecation detection electrode pair within a period of time, wherein the period of time is 1 s-10 min;

b) finding out the maximum value, the minimum value, the average value and the root mean square value of the resistance value data in the period of time as reference data;

c) selecting a time window for defecation judgment, and finding out the maximum value and the minimum value of resistance value data in the time window, wherein the time window is 1-10 seconds;

d) calculating a slope according to the maximum value and the minimum value in the time window, thereby obtaining the change rate of the resistance value;

e) and judging whether to defecate or not according to the change rate of the resistance value, if the change rate exceeds a defecating threshold value, judging that the defecating is performed, and if the change rate does not exceed the defecating threshold value, judging that the defecating is not performed.

f) And judging that the excrement or the diaper is saturated if the holding time exceeds the holding threshold value according to the holding time of the resistance value at the excrement threshold value, and judging that the diaper is urine if the holding time does not exceed the holding threshold value.

Finally, it is noted that the disclosed embodiments are intended to aid in further understanding of the invention, but those skilled in the art will appreciate that: various substitutions and modifications are possible without departing from the spirit and scope of the invention and the appended claims. Therefore, the invention should not be limited to the embodiments disclosed, but the scope of the invention is defined by the appended claims.

Claims (10)

1. An intelligent diaper with a diaper saturation reminding function at multiple sensing points, which is characterized by comprising: the device comprises a substrate, a plurality of groups of detection electrodes and a multiplexing unit; the surface of the substrate is distributed with a plurality of groups of detection electrodes from front to back to form a sensing structure, and each group of detection electrodes comprises two independent sensing electrodes; the multiple groups of detection electrodes are arranged in a non-uniform distribution mode; the substrate is discontinuous, and gaps are formed among the induction electrodes to form a hollow or strip-shaped structure; each induction electrode comprises two metal electrodes which are respectively arranged on the upper surface and the lower surface of the substrate, and the two metal electrodes of the same induction electrode are mutually conducted; the sensing structure is arranged on the surface, attached to the skin, of the diaper, a plurality of groups of detection electrodes are distributed from front to back along the central axis of the diaper, two metal electrodes of each sensing electrode face the skin outwards and face the diaper inwards respectively, the metal electrodes facing the skin can judge whether the diaper is saturated or not and whether the diaper is defecated or urinated or not, and the metal electrodes facing the diaper inwards can judge whether the diaper is saturated or not; laying an insulating and water-permeable surface layer on the surface of the plurality of groups of detection electrodes facing the diaper and attached to the skin of the baby; each induction electrode is connected to the multiplexing unit through a lead respectively;

the multiplexing unit is arranged at a position where the surface of the diaper faces the abdomen of the baby and does not influence the movement of the baby; the multiplexing unit includes: a switching circuit, a signal processing circuit, an A/D converter, a processor and a communication circuit; each induction electrode is respectively connected to the switching circuit of the multiplexing unit through a lead; every two induction electrodes of the multiplex unit selection detection electrode form a detection electrode pair, and each detection electrode pair is connected to an independent channel of the multiplex unit; when defecation occurs, the resistance value between a pair of sensing electrodes in the pair of sensing electrodes is changed and is transmitted to the multiplexing unit through the lead; the multiplexing unit adopts a preprocessing circuit formed by an analog operational amplifier through a resistance value and a change condition in a period of time, an input signal and an output signal of the preprocessing circuit are in a function relation of proportion, logarithm or exponential, and an output signal of the preprocessing circuit is transmitted to the A/D converter; the A/D converter converts the analog signal into a digital signal and transmits the digital signal to the processor; the processor obtains a resistance value through calculation according to the digital signal value of the A/D converter, judges whether defecating exists or not according to the resistance value, judges whether defecating exists or the diaper is saturated or not according to the change condition of the resistance value within a period of time, and transmits the result to external equipment.

2. The intelligent diaper of claim 1, wherein the processor selects two sensing electrodes in each group of sensing electrodes to form a sensing electrode pair, the processor controlling the switching circuit to connect the two sensing electrodes in the same group to an independent channel of the signal processing circuit of the multiplexing unit; or the processor selects one sensing electrode from each two adjacent groups of sensing electrodes to form a sensing electrode pair, and controls the switching circuit to connect the two sensing electrodes corresponding to the two adjacent groups of sensing electrodes to an independent channel of the signal processing circuit of the multiplexing unit.

3. The intelligent diaper according to claim 1, wherein the two metal electrodes are conducted with each other by opening the two metal electrodes and the substrate therebetween and filling the conductive material, so that the two metal electrodes are conducted with each other; or the two metal electrodes are electrically connected, so that the two metal electrodes are mutually conducted.

4. The intelligent diaper of claim 1, wherein the external device is a cell phone or a repeater; the multiplexing unit is connected with the mobile phone or the repeater in a Bluetooth mode, or the multiplexing unit is connected with the repeater through a wireless connection technology, and the mobile phone or the repeater is accessed to the Internet through wireless fidelity (WIFI) or a mobile network; or the multiplexing unit directly accesses the Internet in a narrow-band Internet of things NB-IoT mode based on WIFI and honeycomb.

5. The intelligent diaper of claim 1, wherein the sensing structure is disposed externally to the surface of the diaper or internally within the diaper; in the peripheral mode, the sensing structure is arranged on the surface of the diaper, which is attached to the skin, and the surface of the detection electrode is paved with an insulating and water-permeable surface layer; in the built-in mode, a sensing structure is arranged in a flow guide layer of the diaper, and insulating water-permeable surface layers are arranged on the surfaces of a plurality of groups of sensing electrodes on the flow guide layer.

6. The intelligent diaper of claim 1, wherein the plurality of sets of detection electrodes are arranged differently for different babies: the density of the detection electrodes at the front part of the multi-group detection electrodes of the diaper for the boy baby is high, and the density of the detection electrodes at the middle part and the rear part of the multi-group detection electrodes is low; the detection electrodes at both ends of the plurality of groups of detection electrodes of the diaper for the female baby have low density, and the detection electrodes at the middle position have high density.

7. A monitoring method of an intelligent diaper with a diaper saturation reminding function at multiple sensing points according to any one of claims 1-6, characterized in that the monitoring method comprises the following steps:

1) a plurality of groups of detection electrodes are distributed on the surface of the substrate from front to back to form a sensing structure, each group of detection electrodes comprises two independent induction electrodes, the substrate is discontinuous, and a gap is formed between every two induction electrodes to form a hollow or strip-shaped structure; each induction electrode comprises two metal electrodes which are respectively arranged on the upper surface and the lower surface of the substrate, and the two metal electrodes of the same induction electrode are mutually conducted; the sensing structure is arranged on the surface of the diaper, which is attached to the skin, a plurality of groups of detection electrodes are distributed from front to back along the central axis of the diaper, two metal electrodes of each sensing electrode respectively face the skin outwards and face the diaper inwards, an insulating water-permeable surface layer is tiled on the surface of the plurality of groups of detection electrodes, which faces the diaper and is attached to the skin of the baby, and each sensing electrode is connected to the multiplexing unit through a lead;

2) the multiplexing unit is arranged at a position where the surface of the diaper faces the abdomen of the baby and does not influence the movement of the baby;

3) the multiplexing unit selects every two induction electrodes to form a detection electrode pair, and each detection electrode pair is respectively connected to an independent channel of the multiplexing unit;

4) when defecation occurs, the resistance value between a pair of sensing electrodes in the pair of sensing electrodes is changed and is transmitted to the multiplexing unit through the lead;

5) the multiplexing unit obtains a resistance value through calculation, judges whether the excrement is discharged or not, judges whether the excrement is discharged or whether the diaper is saturated or not according to the change condition of the resistance value within a period of time, and transmits the result to external equipment; if the diaper is judged to be defecated or saturated, a diaper change prompt is sent.

8. The monitoring method according to claim 7, wherein in step 3), the processor selects two sensing electrodes in each group of sensing electrodes to form a sensing electrode pair, and the processor controls the switching circuit to connect the two sensing electrodes in the same group to an independent channel of the signal processing circuit of the multiplexing unit; or the processor selects one sensing electrode from each two adjacent groups of sensing electrodes to form a sensing electrode pair, and controls the switching circuit to connect the two sensing electrodes corresponding to the two adjacent groups of sensing electrodes to an independent channel of the signal processing circuit of the multiplexing unit.

9. The monitoring method according to claim 7, wherein in step 5), the resistance value between two sensing electrodes in the sensing electrode pair is changed, the signal processing circuit adopts a preprocessing circuit composed of an analog operational amplifier, the input signal and the output signal of the preprocessing circuit are in a proportional, logarithmic or exponential functional relationship, and the output signal of the preprocessing circuit is transmitted to the A/D converter; the A/D converter converts the analog signal into a digital signal and transmits the digital signal to the processor; the processor obtains a resistance value through calculation according to the digital signal value of the A/D converter, judges whether the patient defecates and whether the patient defecates or urinates, and judges whether the patient defecates or whether the diaper is saturated according to the change condition of the resistance value within a period of time; the processor is connected to a communication circuit, which delivers the results to an external device.

10. The method of monitoring as claimed in claim 7, wherein in step 5), the processor determines whether to defecate and whether to either defecate or if the diaper is saturated, including the steps of:

a) the processor continuously records resistance value data between two induction electrodes of one defecation detection electrode pair within a period of time, wherein the period of time is 1 s-10 min;

b) finding out the maximum value, the minimum value, the average value and the root mean square value of the resistance value data in the period of time as reference data;

c) selecting a time window for defecation judgment, and finding out the maximum value and the minimum value of resistance value data in the time window;

d) calculating a slope according to the maximum value and the minimum value in the time window, thereby obtaining the change rate of the resistance value;

e) judging whether defecation occurs or not according to the change rate of the resistance value, if the change rate exceeds a defecation threshold value, judging that the defecation occurs, and if the change rate does not exceed the defecation threshold value, judging that the defecation does not occur;

f) and judging whether the excrement or the diaper is saturated or not according to the retention time of the resistance value at the excrement threshold, if the retention time exceeds the retention threshold, judging that the excrement or the diaper is saturated, and if not, judging that the urine is urine.

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