CN113876491B

CN113876491B - Sanitary product capable of distinguishing shit and urine

Info

Publication number: CN113876491B
Application number: CN202111092835.0A
Authority: CN
Inventors: 孙滕谌; 康涛; 庄玮; 王凯
Original assignee: Beijing Tashan Technology Co ltd
Current assignee: Beijing Tashan Technology Co ltd
Priority date: 2021-09-17
Filing date: 2021-09-17
Publication date: 2023-03-24
Anticipated expiration: 2041-09-17
Also published as: CN113876491A

Abstract

A sanitary product capable of distinguishing shit and urine comprises a surface wrapping layer, an absorption layer and a leakage-proof layer, wherein the absorption layer comprises a water absorption layer and a polymer water locking layer, a shit and urine detection sensor is arranged in the surface wrapping layer, and the detection sensor is electrically connected with an external control device; the sensor comprises two opposite detection electrodes and two insulating layers positioned above and below the electrodes, wherein each detection electrode is positioned between the two insulating layers; an induction area is commonly enclosed between the two detection electrodes and the upper and lower insulating layers, an induction gap is formed between the two detection electrodes, and the induction gap extends from the lower insulating layer to the surface wrapping layer; the control device is connected with the two detection electrodes of the sensor, and judges the excrement or urine saturation condition according to the resistance change and the capacitance change between the two detection electrodes to output alarm information. When the sanitary product is wet by urine and is close to a saturated state or has excrement, the sanitary product can be timely reminded, and a nursing staff or a parent can replace the sanitary product after receiving the prompt.

Description

Sanitary product capable of distinguishing shit and urine

Technical Field

The invention relates to the field of daily necessities, in particular to a sanitary product capable of distinguishing shit and urine, and specifically relates to products such as a diaper, a diaper and the like which are massively used in daily life.

Background

The products such as the present commercially available diaper and high-quality urine pad, because the high molecular material is added, more precisely the development of the high molecular material is applied to the products such as the diaper, the products such as the diaper have super-strong water absorption and water locking capability, can rapidly absorb a large amount of urine and lock the urine without influencing the comfort of users, and are widely applied to infants and patients at present. Because infants and patients have no self-care ability and most of the existing products can not detect and monitor whether the infants and the patients are wet by urine to be close to saturation or have excrement dissolved, nursing personnel or parents need to check whether the infants or the patients urinate to a certain degree at intervals to influence the skin of the infants or the patients or have excrement; if the urine bag is frequently replaced, the function of urine non-wetting in the prior art is not fully exerted, waste is caused, and inconvenience is brought to users; if the user needs to replace the urine or the excrement without being aware of delaying the replacement, the problem caused by the fact that the saturated urine or the excrement discharged by the user is attached to the skin for a long time is also caused, and skin diseases are easily caused; even if some products incorporate detection devices, various problems exist.

As disclosed in application No. 201110433861.5, the electrochemical method is adopted, and an electrolyte is formed by a metal electrode and urine, so that the electrolyte is changed into an electrolytic capacitor, the capacitance is improved to be higher than uf level, and the influence of the capacitance of a human body (below 300 pf) can be ignored. Meanwhile, the scheme of arranging the detection electrodes on different layers of the paper diaper is disclosed, and the distinction of excrement and urine is also mentioned, but no specific solution is given.

Another patent document, 202010410663.6, discloses an absorbent article and a method for detecting and distinguishing between urination and defecation, which utilizes an absorption layer having different absorption capacity for liquid with different fluidity and an electrolytic capacitor to detect the change rule of the capacitance of the absorption layer, but the structure of the absorption layer is complicated and the electrolyte generated by the electrolytic capacitor releases harmful substances and gases.

Application number 201710058948.6 discloses a defecation detection sensor, a diaper and a monitoring system, which utilize the misreport through holes and an isolation layer to divide the sensor into a defecation detection area and a urination detection area, namely, the defecation detection area is distinguished by utilizing a human body structure, isolation measures are taken to prevent the false alarm of defecation, but the position is difficult to master when the defecation detection sensor is used specifically due to reasons such as human body action or different body types.

Application number 201810006992.7 discloses an intelligent diaper with a diaper saturation monitoring function at multiple sensing points and a monitoring method, wherein a method of measuring resistance by multiple pairs of electrodes is utilized, and whether the diaper is saturated or not is judged according to the resistance value and the change condition within a period of time. The multi-point electrodes are arranged on the hollow substrate, so that the processing process and the structure are more complicated and the cost is higher due to the production process, the material cost and the like.

Application number 201510596695.9 discloses an alarm nursing article capable of distinguishing shit, and the electrode is placed on or under the permeable formation of nursing pad, and the electrode contains the conducting surface and is not stained with the insulating face of water, and the conducting surface contact permeable formation is not stained with the insulating face contact absorbent material layer of water, be equipped with excrement discernment hole on the nursing pad to make the electrode pass through excrement discernment hole, the electrode conducting surface can pass through the permeable formation short circuit to two electrodes with the permeable formation contact, unable discernment shit, and excrement discernment hole exists the problem that the inaccurate area of coverage of counterpointing is little.

Application number is 200920114721.X discloses a urine articles for use and urine wet alarm are prevented in area warning, and this patent utilizes the principle of resistance-measuring to realize humidity sensing to judge whether there is the urine wet emergence to report to the police, this application is with two spaced electrodes, and measure the resistance between two electrodes, the electrode can circuitous arrange or the straight line is arranged. However, the patent does not adopt an upper insulating layer and a gap, and does not utilize the depth of a groove, so that the risk of false alarm caused by direct contact of a human body with two electrodes cannot be avoided.

Although the patent discloses a solution using a detection resistor, the infant urination reminder disclosed in application No. 201310420257.8 cannot achieve the problems of distinguishing between urination and defecation and judging the urine saturation.

Disclosure of Invention

The technical problem to be solved by the present invention is to overcome the above-mentioned deficiencies of the prior art, and to provide a sanitary product which can not only distinguish between urination and defecation, but also further detect the urine saturation, because the products such as diaper and urine pad are not expensive, and are disposable, there is a relatively strict requirement on the cost of the added detection device, and it is necessary to consider the structure, cost and other angles, and in addition, it is necessary to consider the possible influence of the electrode applying the high frequency signal test capacitor on the human body and to avoid the structure.

The sanitary product capable of distinguishing the excrement and the urine comprises a surface wrapping layer, an absorption layer and a leakage-proof layer, wherein the absorption layer comprises a water absorption layer and a high-molecular water locking layer, an excrement and urine detection sensor is arranged in the surface wrapping layer, and the excrement and urine detection sensor is electrically connected with an external control device; the excrement and urine detection sensor comprises two detection electrodes which are oppositely arranged and two insulating layers which are positioned above and below the electrodes, and each detection electrode is positioned between the two insulating layers; an induction area is commonly enclosed between the two detection electrodes and the upper and lower insulating layers, an induction gap is formed between the two detection electrodes, and the induction gap extends from the lower insulating layer to the surface wrapping layer; the control device is connected with the two detection electrodes of the urination and defecation detection sensor, and the control device judges the saturation condition of excrement and/or urine and/or the absorption liquid of the sanitary product according to the resistance change and the capacitance change between the two detection electrodes and outputs alarm information.

The product of the invention is that a sensor is additionally arranged in the existing products of diaper, etc., and is connected to a control device outside the diaper; the diaper product comprises a surface wrapping layer, an absorption layer and a leakage-proof layer, wherein the absorption layer comprises a water absorption layer and a polymer water locking layer from the aspect of internal and external structures; in terms of the three-dimensional structure, the diaper product also has a side leakage prevention enclosure; through setting up two electrodes that have the response clearance, appear defecating or the condition of urine in the test clearance between the electrode resistance and the electric capacity change, controlling means distinguishes according to this and defecates urine and judges the saturation condition that sanitary product absorbs liquid, and alarm information is output at last, and alarm information is actually whether change the wet logic instruction of urine, including various reputation electric mode, also including wireless, various output modes of prior art such as bluetooth.

In order to prevent the contact of the electrode and a human body under the conditions of extrusion and the like, the upper surface and the lower surface of the electrode are respectively provided with an insulating layer, so that the absorption efficiency of the diaper on urine is influenced by the sensor in the structure, in order to reduce the adverse effect as much as possible, the front part and the rear part of the sanitary product such as the diaper and the like corresponding to the position of the human body where excrement and urine are generated are respectively provided with an excrement and urine detection sensor, the general area of each excrement and urine detection sensor is 100-200 square millimeters, and the two excrement and urine detection sensors can be connected in series or in parallel to a control device; for the diaper product suitable for adults, the covering space of the sensor can be properly enlarged, and therefore, the linear sensor can be arranged in a winding manner, namely the sensing gap forms a continuous bending groove between the surface wrapping layer and the absorption layer.

Furthermore, the width of the induction gap is 2-5mm, and the depth is 0.5-3mm. The detection electrode is conductive cloth or a conductive wire, the width of the detection electrode is 1-5mm, and the thickness of the detection electrode is 0.3-1mm.

Further, the width of the sensing gap at the position of the detection electrode is larger than the width of the upper and lower insulating layers, so that the situation can be prevented because a user turns over and presses the electrode to be in contact with a human body, and the detection electrode is retracted a bit, and the width of the upper and lower layers of the groove can be the same.

Further, in order to prevent the sensing gap from being squeezed to cause that the electrode cannot accurately detect excrement or urine entering the sensing gap, the sensing gap may be intermittently provided with insulating supports, or one or more of the upper and lower insulating layers and the surface wrapping layer may be made into intermittent insulating supports. The reason for the intermittent arrangement is to not only keep the stability of the structure of the sensing gap, but also enable the excrement or urine to enter the sensing gap. Can be made by embroidery or hollow-out process.

Further, in order to measure the capacitance of a very small electrode used beside the large capacitance of the human body more accurately, the urination and defecation detecting sensor further comprises an upper shielding layer and a lower shielding layer, wherein the upper shielding layer and the lower shielding layer are respectively arranged on the upper surface of the insulating layer above the detecting electrode and the lower surface of the insulating layer below the detecting electrode. And an active shield is arranged between the upper shield layer and the lower shield layer or the upper shield layer and the lower shield layer are both grounded.

Further, the control device comprises a power supply, an MCU control chip and an analog switch group for switching and detecting the change of the resistance and the capacitance; when the capacitance change is detected, the analog switch respectively connects the two detection electrodes to the capacitance input port of the control chip and the excitation port of the control chip; and detecting the resistance change by respectively connecting two detection electrodes into VCC and AD detection ports of the control chip by the analog switch. The ports of the control chip may be configured by internal configuration as capacitive input, excitation signal or AD detection ports.

Further, the absorption rate of urine or whether the urine is feces can be judged by calculating the fall time and the rise time of the resistance data; similarly, the urine and excrement conditions can be distinguished by calculating the projection area of the descending and ascending time and judging the urine absorption saturation of the high polymer material in the diaper.

Furthermore, the change of the resistance of the electrode along with the time is measured, and then the integral formula is adopted

Calculating the area of the resistance change curve when S = S _{Saturation of} When the sanitary product is in a saturated state; when any one time Si is more than or equal to S _Stool When the sanitary product is in the defecation state; or calculating the rising time and the falling time of the resistance change curve to distinguish between urine and stool when t is ₂ ≥t _{Saturation of} When the sanitary product is in a saturated state; when t is ₁ +t ₂ Is more than or equal to 1 time t _{Saturation of} When the sanitary product is in the defecation state; where Si is the integral area between the resistance value curve after the threshold value is calculated from the beginning and the threshold value line of the initial calculation, t ₁ Is the timing time t between the resistance value being lower than the initial calculation threshold value and the resistance value rising to the end calculation threshold value ₂ When t is ₁ The timing time from the time when the timing is finished to the time when the resistance value rises to be more than or equal to the time when the timing is finished is determined, the initial calculation threshold value is a set value with the resistance value being less than the maximum value, and the end calculation threshold value is a set value with the resistance value being more than the lowest value; initial calculation threshold, end calculation threshold, S _{Saturation of} 、S _Stool 、t _{Saturation of} Is a configurable threshold derived from experimental data.

Furthermore, because the capacitance between two detection electrodes belongs to the state of PF quantity pole, in order to accurately detect the capacitance change, a very mature digital capacitance conversion circuit is introduced in the patent. The two urination and defecation detection electrodes are respectively connected to an excitation signal end and a capacitor access end of the digital capacitance conversion circuit, the technology is mature, and the adopted digital capacitance conversion circuit chips are CY8C4000 series and the like.

The control device is integrated on the flexible circuit board, the flexible circuit board is coated in the silica gel sleeve, and the silica gel sleeve is adhered on the sanitary product or is arranged in a small pocket on the sanitary product or is lapped on the sanitary product through a hasp.

The control device is connected with the sensor through a snap fastener or is in press connection or insertion connection with the sensor.

In this scheme, integrated control device's flexible circuit board detachable installs on sanitary product to adopt detachable connected mode with the sensor, and a plurality of sensors are general with this flexible circuit board, can dismantle integrated control device's flexible circuit board when changing sanitary product like this, only need with sanitary product and sensor change can, saved use cost.

In the scheme, the excrement and urine detection device is arranged on the sanitary product, so that a nursing person or a parent does not need to pay attention to whether the infant or the patient urinates or not at any time, the sanitary product can be timely reminded when the sanitary product is wetted by urine and is close to a saturated state or has excrement, and the nursing person or the parent can replace the sanitary product after receiving the prompt; the nursing labor amount is saved, the waste of insufficient use caused by urine retention is avoided, the inconvenience brought to a user is avoided, and the replacement information is accurately given; the control device can accurately detect the urine saturation state and whether excrement appears according to the resistance change and the capacitance change between the two detection electrodes in the sensor within the set time, and gives a prompt.

Furthermore, because the condition of capacitance change can be detected, the night sweat and sleep condition of the user can be monitored, and the function of health monitoring is very easy to be added. Moreover, the electrode sensor has very simple structure and low manufacturing cost, has limited influence on the whole manufacturing cost of the diaper or the urine pad, can improve the performance by a great level, and has remarkable social and economic benefits.

Drawings

In order to illustrate the embodiments of the invention or the technical solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the invention, and other similar technical equivalents can be obtained from the drawings without inventive work for a person skilled in the art.

FIG. 1 is a schematic of the hierarchy of the present invention;

FIG. 2 is a schematic view of a sensor of the present invention arranged circuitously over a hygiene product;

FIG. 3 is a schematic view of the present invention with one sensor disposed in each of the front and rear of the hygienic product;

FIG. 4 is a schematic view of a sensor serial connection of the present invention;

FIG. 5 is a schematic diagram of a parallel connection of sensors of the present invention;

FIG. 6 is a schematic view of the present invention with additional shielding layers on top and bottom;

FIG. 7 is a schematic illustration of the shield to ground of the present invention;

FIG. 8 is a schematic illustration of the shield layer of the present invention being an active shield;

FIG. 9 is a functional block diagram of an analog switch of the present invention;

FIG. 10 is a schematic block diagram of the circuit of the present invention;

FIG. 11 is an equivalent circuit for measuring resistance according to the present invention;

FIG. 12 is an equivalent circuit of the present invention when measuring capacitance;

FIG. 13 is a graph showing the resistance change during one urination according to the present invention;

FIG. 14 is a graph of resistance change and integration over multiple urination;

FIG. 15 is a graph of capacitance values when a person turns over while the hygiene product is in use;

FIG. 16 is an example diagram of a product circuitous arrangement of sensors on a hygiene product of the present invention;

FIG. 17 is a graph of the integral of the resistance change during a defecation process;

FIG. 18 is a graph showing a resistance change in a single defecation process.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It should be apparent that the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

See fig. 1, 3, 4, 5; the sanitary product capable of distinguishing the excrement and urine comprises a surface wrapping layer 201, an absorption layer and a leakage-proof layer 105, wherein the absorption layer comprises a water absorption layer 104 and a polymer water locking layer 103, an excrement and urine detection sensor 200 is arranged in the surface wrapping layer 201, and the excrement and urine detection sensor 200 is electrically connected with an external control device 400 through a lead 300; the urination and defecation detection sensor 200 comprises two opposite detection electrodes 203 and 213 and two insulating layers 202 and 204 positioned above and below the detection electrodes 203 and 213, and each detection electrode is positioned between the two insulating layers; a sensing area is commonly enclosed between the two detection electrodes 203 and 213 and the upper and lower insulating layers 202 and 204, and a sensing gap d (reference numeral 207) is formed between the two detection electrodes 203 and 213, and the sensing gap d (reference numeral 207) extends from the lower insulating layer 204 to the surface wrapping layer (reference numeral 201); the control device 400 is connected with the two detection electrodes 203, 213 of the urination and defecation detection sensor 200, and the control circuit 400 judges the state of the excrement and/or urine and/or the saturation of the sanitary product according to the resistance change and the capacitance change between the two detection electrodes 203, 213 and outputs alarm information.

The product of the invention is that a urine and excrement detection sensor 200 is additionally arranged in the existing diaper product 100 and is connected with a control circuit 400 outside the diaper 100; the diaper product 100 comprises a surface wrapping layer 201, an absorption layer and a leakage-proof layer 105, wherein the absorption layer comprises a water absorption layer 104 and a macromolecule water-locking layer 103 from the aspects of internal and external structures; in terms of the three-dimensional structure, the diaper product also has a side leakage prevention enclosure; through setting up two

detection electrode

203, 213 that have the response clearance, resistance and the electric capacity change between

electrode

203, 213 under the condition that appears defecating or urine in test response clearance d (reference numeral 207), control circuit 400 distinguishes defecating and urine and judges the saturation condition of sanitary product according to this, outputs alarm information at last, and alarm information is actually whether change the wet logic instruction of urine, including various reputation electric mode, also including wireless, various output modes of prior art such as bluetooth.

Refer to fig. 1, 2, 3, 4, 5; in order to prevent the contact between the

detection electrodes

203, 213 and the human body under the squeezing condition, the invention must respectively arrange a layer of insulating

layer

202, 204 on the upper and lower surfaces of the detection electrode, so that the urine and feces detection sensor has an influence on the urine absorption efficiency of the urine pad, in order to reduce the adverse effect as much as possible, a urine and feces detection sensor 200 can be respectively arranged at the front part and the rear part of the urine pad corresponding to the position where the human body generates urine and feces, the area of each urine and feces detection sensor is 100-200 square millimeters, a plurality of urine and feces detection sensors can be connected to the control device 400 in series (as shown in fig. 4) or in parallel (as shown in fig. 5); for a diaper product suitable for adults, the sensor coverage may be suitably enlarged, for which purpose a linear sensor may be placed in a meandering manner (as shown in fig. 2), i.e. the sensing gap forms a continuous bending groove 211 between the surface coating and the absorbent layer.

Further, with reference to fig. 1; the width d (207) of the sensing gap formed by the

detection electrodes

203 and 213 and the upper and lower insulating layers thereof is 2-5mm, and the depth h1 (210) is 0.5-3mm. The detection electrode is conductive cloth or a conductive wire, the width D (219) is 1-5mm, and the thickness h (209) is 0.3-1mm.

Further, the width of the sensing gap d (207) at the position of the detection electrode is larger than the width d1 (208) at the position of the upper and lower insulating layers, because the user is worried that the detection electrode is pressed to contact with the human body when turning over, the detection electrode is retracted a little to prevent the situation, and the width of the upper and lower layers of the groove 211 can be the same.

Referring to fig. 2, in order to prevent the sensing gap 207 (groove 211) from being pressed to prevent the electrode from accurately detecting stool or urine entering the sensing gap, the sensing gap 207 (groove 211) may be intermittently provided with the insulating supports 110, or one or more of the upper and lower air-permeable insulating layers and the surface-wrapping layer may be formed as intermittent insulating supports 110 by pressing. The reason for the intermittent arrangement is to both keep the structure of the sensing gap 207 (groove 211) stable and allow excrement or urine to enter the sensing gap 207 (groove 211). Can be made by embroidery or hollow process.

Refer to fig. 6, 7, 8, 10; further, in order to accurately measure the very small electrode capacitance near the large capacitance of the human body, the urination and defecation detecting sensor further comprises upper and lower shielding layers 206, wherein the upper and lower shielding layers 206 are respectively arranged on the upper surface of the insulating layer 202 above the detecting

electrodes

203 and 213 and on the lower surface of the insulating layer 204 below the detecting

electrodes

203 and 213. The upper and lower shielding layers 206 are disposed as an active shield (as shown in fig. 8) or both are grounded (as shown in fig. 7).

Refer to fig. 9, 10; further, the control device comprises a power supply 430, an MCU control chip 420, and an analog switch group 410 for switching and detecting the change of resistance and capacitance; when the capacitance change is detected, the analog switch 411 in the analog switch group 410 is connected with the port 2, the analog switch 412 in the analog switch group 410 is connected with the port 4, the two detection electrodes 203 and 213 are respectively connected with the capacitance input port of the MCU control chip 420 and the excitation port of the control chip, the equivalent circuit refers to fig. 12, at this time, the ports of the MCU control chip 420 are respectively configured as an excitation signal and a capacitance input terminal, and the change of the capacitance 503 formed between the two detection electrodes 203 and 213 can be detected; the detection resistance change is that analog switch 411 switches on port 1, analog switch 412 switches on port 3, insert two detection electrodes VCC respectively with the AD detection port of MCU control chip 420, its equivalent circuit refers to FIG. 11, MCU control chip port sets up to AD detection port this moment, be equivalent to variable resistance 501 between detection electrode 203, 213, equivalent variable resistance one end ground connection, one end switches on the power VCC through sampling resistor 502 and forms bleeder circuit, can obtain 502, the voltage change of 501 common port through AD sampling acquisition voltage, can obtain the resistance change of variable resistance 501 through the calculation. The ports of the MCU control chip 420 may be configured as capacitive input, excitation signal, or AD detection ports through internal configuration.

Refer to fig. 13, 14, 17, 18; in the figure, R represents a resistance change value, t is a time change, Y1 is a resistance reference value in a normal case, 601 is a resistance basic value reference line drawn in parallel with t with Y1 as a starting point, Y2 is a start calculation threshold value, 602 is a start calculation threshold value line drawn in parallel with t with Y2 as a starting point, Y3 is an end calculation threshold value, 603 is an end calculation threshold value line drawn in parallel with t with Y3 as a starting point, Y4 is a maximum value of a change of an electrode affected by urine and feces, 604 is a maximum value reference line drawn in parallel with t with Y4 as a starting point, t1 is a time from a start of a resistance data curve descending and passing through the start calculation threshold value line 602 to a start of a resistance data curve ascending and passing through the end calculation threshold value line 603, t2 is the time from the end of timing t1 to the rise of the resistance data curve and the crossing of the initial calculation threshold line 602, S1, S2, \ 8230, SN is the area formed by the cutting of the initial calculation reference line 602 between the fall of the resistance data curve and the crossing of the initial calculation threshold line 602 and the rise of the resistance data curve and the crossing of the initial calculation threshold reference line 602, because the resistance value sampled in the actual use process is not necessarily exactly equal to the set threshold value (initial calculation threshold value, ending calculation threshold value), the crossing is adopted when describing, namely, the timing starting point of timing t1 is the starting point when the resistance value is less than or equal to the initial calculation threshold value, and the timing is stopped when the resistance value is greater than or equal to the ending calculation threshold value; whether the absorption rate of urine or whether the urine is feces can be judged by comparing the falling time t1 and the rising time t2 of the resistance data curve, when the t1 falls quickly, the retention time is short, and when the t2 rises quickly, the urine is obtained, and when the t1 falls quickly and the t2 rises slowly, the urine can be regarded as that a macromolecule absorption layer in the feces or the urine pad is saturated, and at the moment, prompt information can be sent to prompt the replacement of the urine pad.

That is, referring to fig. 14 and 17, the change in the electrode resistance with time is measured, and then the integral formula is used

Calculating the area of the resistance change curve when S = S _{Saturation of} When the sanitary product is in a saturated state; when any one time Si is more than or equal to S _{Excrement (human excrement)} When the sanitary product is in the defecation state; or calculating the rising time and the falling time of the resistance change curve to distinguish between urine and stool when t is ₂ ≥t _{Saturation of} When the sanitary product is in a saturated state; when t is ₁ +t ₂ Is more than or equal to 1 time t _{Saturation of} When the sanitary product is in the defecation state; where Si is the integral area between the resistance value curve after the threshold value is calculated from the beginning and the threshold value line of the initial calculation, t ₁ Is the timing time t between the resistance value being lower than the initial calculation threshold value and the resistance value rising to the end calculation threshold value ₂ When t is ₁ When the timing is finished and the resistance value rises to be more than or equal to the timing time between the end of the timing and the calculation threshold value, the initial calculation threshold value is a set value with the resistance value smaller than the maximum value, and the end of the calculation threshold value is a set value with the resistance value larger than the lowest value of the resistance value; initial calculation threshold, end calculation threshold, S _{Saturation of} 、S _{Excrement (human excrement)} 、t _{Saturation of} Is a configurable threshold derived from experimental data. The urine absorption saturation of the high molecular material in the diaper can also be judged by calculating the projection areas S1, S2, \8230;, and the sum of SN. The resistance capacitance measurement is measured using the equivalent circuit of fig. 11 or fig. 12. The measurement results are shown in FIG. 14, in which the integral effect of each urination and absorption is shown by the portions S1, S2 and SN marked by oblique line shading. Wherein, the initial calculation threshold value and the final calculation threshold value are empirical values and can be determined according to the data fluctuation range. FIG. 18 is an area integral graph and a graph of stool state, respectively, as shown in FIG. 17, in which it can be seen that when stool occurs, since the curve cannot pass through the initial calculation threshold line 602 again for a long time, when the portion Si marked by the oblique line of the integral area is larger than S _Stool Shiyin (a Chinese character)The stool can be judged by the shadow part. Also when t is ₁ +t ₂ Is more than or equal to one time t _{Saturation of} The stool can be judged immediately.

Furthermore, because the capacitance between the two electrodes belongs to the state of PF number poles, in order to accurately detect the capacitance change, a mature digital capacitance conversion circuit is introduced in the patent to form a CY8C4000 series chip. Referring to fig. 10, the control device 400 includes a power module 430, an alarm circuit 440, an MCU control chip 420, and an analog switch set 410, wherein the analog switch set may also be included in the MCU control chip 420. The

detection electrodes

203 and 213 are respectively connected into an analog switch group 410 of the controller 400, the MCU label 420 is selectively connected through the analog switch group, a capacitor Cx and a resistor Rx are formed between the

electrodes

203 and 213, meanwhile, the electrode 206 is connected into a pin of an MCU control chip 420 through the analog switch 410, the active shielding or grounding treatment can be formed through the setting of the MCU control chip 420, and the

detection electrodes

203 and 213 are wrapped inside by the electrode 206, so that the influence of the human body and urine in an absorption layer on the

detection electrodes

203 and 213 is minimized. When urine or feces enters the sensing gap formed by the

detection electrodes

203 and 213, the capacitance and the resistance are affected, and the MCU control chip 420 judges the data before combination and outputs a result through an alarm circuit.

Referring to the capacitance change curve of fig. 15, it can be seen that when a human body rolls, the capacitance is greatly influenced, so that the capacitance data is greatly reduced, and the resistance at the same time is not influenced by the human body turning, so that the unconscious turning times of the human body in sleeping can be judged, and a basis is provided for judging the sleeping quality of the human body.

Referring to fig. 16, the control device 400 is integrated on a flexible circuit board, and the flexible circuit board is covered in a silicone sleeve, or other flexible casing, the silicone sleeve is adhered to the sanitary product 100, or is placed in a small pocket on the sanitary product 100, or is lapped on the sanitary product 100 through a snap, the electric wire connecting the control device 400 and the sensor electrode is not shown in the figure, and a snap connection structure connecting the control device 400 to the sensor electrode is also not shown.

The control device 400 is connected to the urination and defecation detecting sensor 200 by a snap fastener or the control device 400 is connected to the urination and defecation detecting sensor 200 by press fit or insertion.

In this scheme, integrated control device 400's flexible circuit board detachable installs on sanitary products to adopt detachable connected mode with excrement and urine detection sensor 200, and a plurality of excrement and urine detection sensor 200 are general with this flexible circuit board, can dismantle the flexible circuit board that integrates with control device 400 like this when changing sanitary products 100, only need with sanitary products 100 with excrement and urine detection sensor 200 change can, saved use cost.

All the schemes are designed by alarm information for giving replacement when excrement appears, but actually, the alarm threshold value can be modified by completely detecting the quantity, the drying state and the tolerance of the excrement through a capacitance resistance change curve, just like the saturation of the tolerant urine.

The excrement and urine detection device is arranged on the sanitary product, so that a nursing person or a parent does not need to pay attention to whether the infant or the patient urinates or not constantly, the sanitary product can be reminded in time when the sanitary product is wetted by urine to be close to a saturated state or has excrement, and the nursing person or the parent can replace the sanitary product after receiving the prompt; the nursing labor amount is saved, the waste of insufficient use caused by urine retention is avoided, the inconvenience brought to a user is avoided, and the replacement information is accurately given; the control device can accurately detect the urine saturation state and whether excrement appears according to the resistance change and the capacitance change between the two detection electrodes in the sensor within the specified time, and prompt. Because the condition of capacitance change can be detected, the night sweat and sleep condition of a user can be monitored, and the function of health monitoring is very easy to add. And the electrode sensor has very simple structure and low manufacturing cost, has limited influence on the whole manufacturing cost of the diaper or the urine pad, can improve the performance by a great level, can conveniently and randomly connect the design of the sensor by adopting a control device, also reduces the use cost of users, and has remarkable social and economic benefits.

Claims

1. A sanitary product capable of distinguishing shit and urine comprises a surface wrapping layer, an absorption layer and a leakage-proof layer, wherein the absorption layer comprises a water absorption layer and a polymer water locking layer, a shit and urine detection sensor is arranged in the surface wrapping layer, and the shit and urine detection sensor is electrically connected with an external control device; the method is characterized in that: the excrement and urine detection sensor comprises two detection electrodes which are oppositely arranged and two insulating layers which are positioned above and below the electrodes, and each detection electrode is positioned between the two insulating layers; an induction area is commonly enclosed between the two detection electrodes and the upper and lower insulating layers, and an induction gap is formed between the two detection electrodes, extends from the lower insulating layer to the surface wrapping layer and upwards penetrates through the surface wrapping layer, so that an air gap is formed in the induction gap; the control device is connected with the two detection electrodes of the urination and defecation detection sensor, and the control device judges the saturation condition of excrement and/or urine and/or the absorption liquid of the sanitary product according to the resistance change and the capacitance change between the two detection electrodes so as to output alarm information;

by measuring the change of the electrode resistance with time and according to an integral formula

Calculating the area of the resistance change curve when S is larger than or equal to S _{Saturation of} When the sanitary product is in a saturated state; when any one time Si is more than or equal to S _Stool When the sanitary product is in the defecation state; or calculating the rising time and the falling time of the resistance change curve to distinguish between urine and stool when t is ₂ ≥t _{Saturation of} When the sanitary product is in a saturated state; when t is ₁ +t ₂ Is more than or equal to 1 time t _{Saturation of} When the sanitary product is in the defecation state; where Si is the integral area between the resistance value curve after the threshold value is calculated from the beginning and the threshold value line of the initial calculation, t ₁ Is the timing time t between the resistance value being lower than the initial calculation threshold value and the resistance value rising from the lowest value to the end calculation threshold value ₂ When t is ₁ The timing time from the time when the timing is finished to the time when the resistance value rises to be more than or equal to the end calculation threshold value, the initial calculation threshold value is a set value with the resistance value being less than the maximum value, and the endThe beam calculation threshold value is a set value larger than the lowest value of the resistance value; initial calculation threshold, end calculation threshold, S _{Saturation of} 、S _Stool 、t _{Saturation of} Is a configurable threshold derived from experimental data; s1, S2, \ 8230, SN is the area formed by cutting the initial calculation threshold line between the descending resistance change curve and the initial calculation threshold line, and the ascending resistance change curve passes through the initial calculation threshold line.

2. A faecal hygiene product according to claim 1, wherein: the induction gap forms a continuous bending groove between the surface wrapping layer and the absorption layer.

3. A faecal hygiene product according to claim 1, wherein: the excrement and urine detection sensors are respectively arranged at the front part and the rear part of the sanitary product corresponding to the positions where the human body produces excrement and urine.

4. A faecal hygiene product according to claim 1, wherein: the width of the sensing gap at the sensing electrode is greater than the width of the sensing gap at the upper and lower insulating layers.

5. A faecal hygiene product according to claim 1, wherein: and the induction gap is intermittently provided with an insulating support, or one or more of the upper insulating layer, the lower insulating layer and the surface wrapping layer are made into an intermittent insulating support.

6. A faecal hygiene product according to claim 1, wherein: the width of the induction gap is 2-5mm, and the depth is 0.5-3mm; the detection electrode is conductive cloth or a conductive wire, the width of the detection electrode is 1-5mm, and the thickness of the detection electrode is 0.3-1mm.

7. A faecal hygiene product according to claim 1, wherein: the excrement and urine detection sensor further comprises an upper shielding layer and a lower shielding layer, wherein the upper shielding layer and the lower shielding layer are respectively arranged on the upper surface of the upper insulating layer above the detection electrode and on the lower surface of the lower insulating layer below the detection electrode.

8. A faecal hygiene product according to claim 7, wherein: and an active shield is arranged between the upper shield layer and the lower shield layer or the upper shield layer and the lower shield layer are both grounded.

9. A faecal hygiene product according to claim 1, wherein: the control device comprises a power supply, an MCU control chip and an analog switch group for switching and detecting the change of resistance and capacitance, wherein when the change of capacitance is detected, the analog switch respectively accesses two detection electrodes into a capacitance input port of the control chip and an excitation port of the control chip, and the change of the detection resistance is that the analog switch respectively accesses the two detection electrodes into VCC and an AD detection port of the control chip.

10. A faecal hygiene product according to claim 9, wherein: the port of the MCU control chip can be internally configured into a capacitance input port, an excitation signal port or an AD detection port.

11. A faecal hygiene product according to claim 1, wherein: the excrement and urine detection sensors in the surface wrapping layer are at least two and are connected with the control device in parallel or in series.