CN113933352A

CN113933352A - Stool and urine detection device and sanitary product

Info

Publication number: CN113933352A
Application number: CN202111094080.8A
Authority: CN
Inventors: 孙滕谌; 康涛; 庄玮; 王凯
Original assignee: Beijing Tashanzhong Corell Contact Laboratory Technology Co ltd
Current assignee: Beijing Tashan Technology Co ltd
Priority date: 2021-09-17
Filing date: 2021-09-17
Publication date: 2022-01-14
Anticipated expiration: 2041-09-17
Also published as: CN113933352B

Abstract

A stool and urine detection device and hygiene products, wherein the stool and urine detection device, including stool and urine detection sensor and controlling device linking, the stool and urine detection sensor includes two detection electrodes set up relatively and locates at the two-layer insulating layer above and below the electrode; 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; the control device is connected with two detection electrodes of the excrement and urine detection sensor, and judges the saturation condition of excrement and/or urine and/or sanitary products according to the resistance change and capacitance change between the two detection electrodes so as to output alarm information. The detection device is placed on a diaper or a urine pad, when the sanitary product is wetted by urine or the urine is wetted to be close to a saturated state or when excrement exists, the sanitary product can be timely reminded, and nursing personnel or parents can replace the sanitary product after receiving the prompt.

Description

Stool and urine detection device and sanitary product

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 urine pad and the like which are massively used in daily life and a shit and urine detection device required by the products.

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.

For the urine pad, especially when used in hospitals, the urine pad needs to detect whether urine and urine exist or not for replacement in most cases, and in some cases, the urine pad can tolerate smaller urine volume and is key to quantitative monitoring.

The urine pad is good, the urine pad is not wet, the urine pad and the urine pad are very popular products, the price is not expensive, in order to save nursing time and effectively detect the urination and defecation conditions, a detection device which can be matched with the products in terms of manufacturing cost is urgently needed, the urination and defecation conditions are also accurately detected, and better health data such as night sweat, turnover and the like can be monitored at the same time.

The least unit of the capacitance sensor is two electrodes, which has the basic condition of low cost, and the development of textile industry and material industry, the electrode can be made by using the material with good comfort, such as conductive cloth, conductive wire, etc., but when the urine pad or the diaper is used on the human body, because the human body is a large capacitance formed by most liquid components, the sensor formed by two electrodes suitable for the urine pad or the diaper has a capacitance value of about several hundred PF, the detection of the capacitance value is required to use a digital capacitance conversion circuit and a professional chip thereof developed in the last ten years, the capacitance digital conversion circuit (CDC) of the existing mature technology, such as ADI7142 and ADI7147, adopts a delta-sigma modulation mode to directly convert the capacitance value to be measured into a digital value by charging and discharging the capacitance value to be measured for many times and comparing the reference capacitance (see US Patent Number:5,134,401), the measurement sensitivity of the capacitor can be improved to 1ff level, the requirement on the measurement sensitivity of the capacitor is easily met, and particularly, the design of the chips is provided with a plurality of channels, so that the circuit design is simple and convenient.

In addition, the resistance between electrodes can be influenced by the excretion and urine discharged by human body, the two parameters can be reflected on the capacitance and the resistance along with the discharging process and the absorbing process, the detection of the two parameters has the characteristics respectively, the two parameters are organically integrated, and the technical problem which is not solved at present is that the accurate monitoring result is obtained by using the simplest circuit structure and the lowest manufacturing cost.

Given the background of these prior art techniques, it is necessary to design a suitable detection sensor configuration to accomplish the objectives of the present invention.

The company also conducts a large number of searches of prior art patents to the industry, finds that the following relatively close patent technologies can not meet the requirements of products with low manufacturing cost and high detection accuracy more or less, and does not consider the influence on human bodies when the technology is applied to the working occasions of diapers, urine pads, even bedding and the like in structure too much:

the electrochemical capacitor-based liquid detection device, method and diaper disclosed in application No. 201110433861.5, wherein an electrochemical method is adopted, and an electrolyte is formed by a metal electrode and urine to form an electrolytic capacitor, so that the capacitance is improved to a uf level or more, 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, application No. 202010410663.6, discloses an absorbent article and a method for detecting and distinguishing between urination and defecation, which provides a method for distinguishing between urination and defecation by using an absorbent layer with different absorption capacities for different flowing liquids and by using an electrolytic capacitor to detect the change rule of the capacitance of the absorbent layer, but the structure of the absorbent layer is too complicated and the electrolyte generated by the electrolytic capacitor releases harmful substances and gases.

Application No. 201710058948.6 discloses a stool and urine detection sensor, diaper and monitoring system, it utilizes misreport through-hole and isolation layer divide into excrement detection area and urine detection area with the sensor, utilizes the human structure to distinguish the excrement and urine detection area promptly to take isolation measure in case the wrong report of stool and urine, nevertheless hardly grasp the position when leading to specifically using because of reasons such as human action or size difference.

Application number 201810006992.7 discloses an intelligent diaper with multiple sensing points and a diaper saturation monitoring function and a monitoring method, which utilize a method of measuring resistance by multiple pairs of electrodes to judge whether the diaper is saturated or not according to the resistance value and the change condition in 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 a warning nursing materials that can distinguish stool and urine, electrode are placed on the permeable formation of nursing pad or down, and the electrode contains the electrically conductive face and is not stained with the insulating face of water, and electrically conductive face contact permeable formation is not stained with the insulating face contact layer that absorbs water, be equipped with excrement discernment hole on the nursing pad to make the electrode through excrement discernment hole, electrode electrically conductive face and permeable formation contact can pass through the permeable formation short circuit to two electrodes, unable discernment stool and urine, and there is the problem that the inaccurate coverage area of counterpoint is little in the excrement discernment hole.

Application number is 200920114721.X discloses a take warning urine articles for use and wet alarm of urine, and this patent utilizes the principle of resistance measurement to realize humidity sensing to judge whether there is the wet emergence of urine 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, does not use the depth of a groove in a gap, so that the risk of false alarm caused by the fact that a human body directly contacts two electrodes cannot be avoided. The patent can not solve the problems of distinguishing the excrement and urine and judging the urine saturation.

Although the patent discloses a solution using a detection resistor, the infant urination reminder disclosed in application No. 201310420257.8 cannot distinguish between urination and defecation and judge the degree of 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 urine and feces detection device and a sanitary product, which are suitable for the cost of products such as urine pads and diapers, and can detect the condition of urine and feces, even the urine saturation, and suitable for sanitary products such as urine pads and diapers, and can be used for monitoring urine and feces such as quilts and trousers, and can detect the health status such as night sweat and turning over.

The invention discloses a defecation detection device, which comprises a defecation detection sensor and a control device connected with the defecation detection sensor, and 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; 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 two detection electrodes to a capacitance input port of the control chip and an excitation port of the control chip; the detection of the resistance change is that the analog switch respectively accesses two detection electrodes to VCC and an AD detection port of the control chip, an excitation end of the control chip comprises a capacitance excitation signal circuit, and the capacitance excitation signal circuit generates a high-frequency square wave excitation signal; the control device judges the saturation condition of excrement and/or urine absorption according to the resistance change and the capacitance change between the two detection electrodes, and outputs alarm information.

The product of the invention can be applied to the existing products such as urine absorbent pads, urine pads, beds, mattresses and the like, is a sensor used for distinguishing shit and urine and judging the saturation condition of urine, tests the resistance and capacitance change between electrodes under the condition that the shit or urine appears in the gap by arranging two detection electrodes with induction gaps, and a control device distinguishes the shit and urine and judges the saturation condition of urine according to the resistance and capacitance change and finally outputs alarm information which is actually a logic instruction of whether to replace the products such as the wet diaper and the like, and comprises various acousto-optic and electric modes, and also comprises various output modes of the prior art such as wireless, Bluetooth and the like.

In order to prevent the detection electrode from contacting with the human body under the conditions of extrusion and the like, the upper surface and the lower surface of the detection electrode are respectively provided with an insulating layer, so that the sensors with the structure can influence the urine absorption efficiency of the diaper, and in order to reduce the adverse effect as much as possible, the front part and the rear part of the diaper, a urine pad, a bed, a mattress and other products can be respectively provided with a urination and defecation detection sensor corresponding to the position of the human body for urination and defecation, the general area of each urination and defecation detection sensor is 100 and 200 square millimeters, and the two urination and defecation detection sensors can be connected in series or in parallel to a control device; for diaper wet products suitable for adults, the covering space of the sensor can be suitably enlarged, for which purpose a linear sensor winding arrangement is possible, i.e. the sensing gap forms a continuous bending groove between the upper and lower insulating layers.

Furthermore, the width of the induction gap is 2-5mm, and the depth is 0.5-3 mm; 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 0.3-1 mm.

Further, the width of the sensing gap at the sensing electrode is larger than the width at the upper and lower insulating layers.

Further, the induction gap extends to the upper insulating layer and does not extend to the lower insulating layer, and the lower insulating layer can support the detection electrode so as to keep the stability of the induction gap structure, so that excrement or urine can enter the induction gap.

Further, the sensing gap extends from the lower insulating layer to the upper insulating layer, and in order to prevent the sensing gap from being pressed to cause the electrodes not to accurately detect stool or urine entering the gap, an insulating support may be intermittently provided in at least one of the two sensing electrodes, the sensing gap, and the upper and lower insulating layers. 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 the very small electrode used beside the large capacitance of the human body more accurately, the urination and defecation 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 detection electrode and the lower surface of the insulating layer below the detection 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.

And a skin-friendly layer covers the upper surface of the upper insulating layer or the upper surface of the upper insulating layer is of a skin-friendly structure. At this time, the sensing gap needs to extend to the skin-friendly layer.

Further, control circuit controlling means includes power, MCU control chip, is used for switching over the analog switch group that detects resistance capacitance change, when detecting capacitance change analog switch inserts two detection electrode respectively control chip's capacitance input port with control chip's excitation port, and detection resistance change is analog switch inserts two detection electrode respectively VCC with control chip's AD detection port. The MCU control chip is a mature digital capacitance conversion circuit chip, for example: ADI7142 and ADI7147 chips are commercially available as mentioned in the background section.

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

Calculating the area of the resistance change curve when S is S_{Saturation of}When the sanitary product is in a saturated state; when any one time Si is more than or equal to S_StoolWhen 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 is₂≥t_{Saturation of}When the sanitary product is in a saturated state; when t is₁+t₂Is 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, t₁Is 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 value₂When t is₁The 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.

The sanitary article comprises a dry layer, a middle absorption layer and a leakage-proof layer, wherein the dry layer is provided with the excrement detection sensor defined by any technical scheme, and the leakage-proof layer is externally provided with a control device defined by any technical scheme.

In the technical scheme of the sanitary product, the excrement and urine detection sensors are respectively arranged at the positions, corresponding to the excrement and urine of the human body, of the front part and the rear part of the dry layer.

In the technical scheme of the sanitary product, further, the middle absorption layer comprises a water absorption layer and/or a polymer water-locking layer.

Compared with the prior art, the excrement and urine detection device and the sanitary product provided by the invention have the advantages that: by arranging the excrement and urine detection device on the sanitary product, a nursing person or a parent does not need to pay attention to whether the infant or the patient urinates or defecates constantly, the sanitary product can remind timely when the sanitary product is wet by urine to a certain saturated state or has excrement, and the nursing person or the parent can replace the sanitary product after receiving the prompt; the labor amount is saved, the waste of products such as diapers and the like which are not fully used is avoided, the inconvenience brought to a user is avoided, and the replacement information is accurately given; the control circuit can accurately measure 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 a specified 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.

Drawings

In order to more clearly illustrate the embodiments or prior art solutions of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other equivalent solutions can be obtained from the drawings without creative efforts.

FIG. 1 is a schematic representation of the hierarchy reflected by the sensor of the present invention when placed on a product such as a diaper;

FIG. 2 is a schematic view of a sensor of the present invention being circuitously disposed on a hygienic article;

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

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 for a sanitary product when a human body is turned over;

FIG. 16 is an example diagram of a product circuitous placement sensor on a hygienic article 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 defecation process;

FIG. 19 is a schematic view of a sensor in a circuitous arrangement incorporated on a paper diaper.

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 is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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 urination and defecation detection device comprises an urination and defecation detection sensor 200 and a control device 400 connected with the urination and defecation detection sensor 200, wherein the urination and defecation detection sensor 200 is electrically connected with the external control device 400 through a lead 300; the urination and defecation detection sensor 200 comprises two adjacent detection electrodes 203 and 213 and two layers of insulating layers 202 and 204 positioned above and below the detection electrodes 203 and 213, and each detection electrode is positioned between the two layers of 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 skin-friendly layer (reference numeral 201); the two detection electrodes are adjacently attached or pressed on the permeable layer 123, the permeable layer plays a role in supporting the two sensor electrodes, and urine can easily pass through the permeable layer and enter the sanitary product; the back of the permeable layer 123 corresponding to the position of the detection electrode is coated with a back adhesive 124, and in order to ensure that the back adhesive is small and can be absorbed by a sanitary product, the interval of the back adhesive 124 is more than or equal to the interval 207 formed by two sensing electrodes; the urination and defecation detecting sensor 200 can be adhered to any sanitary product through a back adhesive 124; 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 a urine and excrement detection device which can be applied to the existing products such as urine pads, urine cushions, beds, mattresses and the like and is used for distinguishing the urine and excrement and judging the saturation condition of the urine, the two

detection electrodes

203 and 213 with induction gaps are arranged, the resistance and capacitance change between the

electrodes

203 and 213 under the condition that the excrement or the urine appears in the induction gap d (marked by a reference numeral 207) is tested, the control circuit 400 distinguishes the excrement and the urine and judges the saturation condition of the sanitary product according to the resistance and the capacitance change, and finally alarm information is output, wherein the alarm information is actually a logic instruction of whether to replace the products such as the urine pads and the like, and comprises various acousto-optic and electric modes, and also comprises various output modes of the prior art such as wireless mode, Bluetooth mode and the like.

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 upper and lower surfaces of the detection electrodes are respectively provided with an insulating layer 202, 204, so that the urine and feces detection sensors with the structure can affect the urine absorption efficiency of the sanitary product, in order to reduce the adverse effect as much as possible, the urine and feces detection sensors 200 can be respectively arranged at the front part and the rear part of the products such as the urine pad, the bed, the mattress and the like corresponding to the position of the human body where the urine and feces are generated, the general area of each urine and feces detection sensor is 200 square millimeters, and the two urine and feces detection sensors can be connected in series (as shown in fig. 4) or in parallel (as shown in fig. 5) to the control device 400; for products such as diapers suitable for adults, the coverage space of the sensor may be suitably enlarged, and for this purpose, a linear sensor may be arranged in a winding manner (as shown in fig. 2 and 19), i.e. the sensing gap forms a continuous bending groove 211 between the surface skin-friendly layer and the absorbent layer.

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

detection electrodes

203, 213 and the upper and lower insulating layers thereof is 2-5mm, and the depth h1 (210) is 0.5-3mm, namely the groove of the two sensors extending from the lower insulating layer 204 to the surface skin-friendly layer (201). The detection electrode is conductive cloth or a conductive wire, the width D (219) is 1-5mm, and the thickness h (209) is 0.3-1 mm.

Further, the width of the sensing gap d (207) at the detecting electrode is larger than the width d1 (208) at the upper and lower air-permeable insulating layers, because there is a fear that the detecting electrode is pressed by a user turning over or the like to contact with the human body, and the detecting electrode is retracted a little to prevent this, which is certainly the same as the width formed by the upper and lower layers of the groove 211.

Refer to fig. 1, 2; further, in order to prevent the sensing gap 207 (groove 211) from being pressed to cause the electrodes not to accurately detect the stool or urine entering the gap, at least one intermittent insulating support 110 may be disposed in both of the sensing electrodes, the sensing gap 207 (groove 211), and the upper and lower insulating layers. 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-out process.

Refer to fig. 6, 7, 8, 10; further, in order to measure the capacitance of a very small electrode used near the large capacitance of the human body with high accuracy, the urination and defecation detecting sensor further includes upper and lower shield layers 206, and the upper and lower shields 206 are respectively disposed on the upper surface of the insulating layer 202 above the detecting

electrodes

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

electrodes

203, 213. The upper and lower shield layers 206 are either actively shielded (as shown in fig. 8) or grounded (as shown in fig. 7).

The upper surface of the upper insulating layer is covered with a skin-friendly layer number 201 or the upper surface is in a skin-friendly structure. The skin-friendly layer or the skin-friendly structure can be made of water-absorbing soft fabrics such as non-woven fabrics and the like because of being in direct contact with a human body, can be adhered, sewed and pressed on the upper surface of the upper insulating layer, or the upper insulating layer can also be made of a skin-friendly and hydrophobic material directly.

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 is detected to be changed, the analog switch 411 in the analog switch group 410 is turned on 2, the analog switch 412 in the analog switch group 410 is turned on 4, the two detection electrodes 203 and 213 are respectively connected to the capacitance input port of the MCU control chip 420 and the excitation port of the control chip, the excitation port can output a high-frequency square wave excitation signal, the equivalent circuit refers to fig. 12, at this time, the ports of the MCU control chip 420 are respectively configured as the excitation signal and the 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 1, analog switch 412 switches on 3 inserts two detection electrodes into VCC respectively with MCU control chip 420's AD detection port, its equivalent circuit refers to FIG. 11, MCU control chip 420 port sets up to AD detection port this moment, be equivalent to variable resistance 501 equivalent variable resistance one end ground connection between detection electrode 203, 213, one end switches on the power VCC through sampling resistor 502 and forms bleeder circuit, can obtain the voltage change of 502, 501 common terminal 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 a urine and urine, 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 to descend and cross the start calculation threshold value line 602 to a start of a resistance data curve to ascend and cross the end calculation threshold value line 603, t2 is a time from a time t1 to a time when the resistance data curve ascends and crosses the start calculation threshold value line 602, S1, S2, …, SN is a time when the resistance data curve descends and crosses the start calculation threshold value line 602, when the resistance data curve rises and passes through the area formed by cutting the initial calculation reference line 602 between the initial calculation threshold reference lines 602, the resistance value sampled in the actual use process is not necessarily exactly equal to the set threshold (initial calculation threshold, end calculation threshold), so that the "passing" is adopted during description, that is, the timing is started when the timing starting point of t1 is the resistance value less than or equal to the initial calculation threshold, and the timing is stopped when the resistance value is greater than or equal to the end calculation threshold; 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 t1 falls quickly, the retention time is short, and when t2 rises quickly, the urine is obtained, and when t1 falls quickly and t2 rises slowly, the urine or the polymeric absorbent layer in the diaper can be considered to be saturated, and prompt information can be sent to prompt the replacement of the diaper at the moment.

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

Calculating the area of the resistance change curve when S is S_{Saturation of}When the sanitary product is in a saturated state; when any one time Si is more than or equal to S_StoolWhen 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 is₂≥t_{Saturation of}When the sanitary product is in a saturated state; when t is₁+t₂Is 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, t₁Is 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 value₂When t is₁The 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 valveValue, end calculation threshold, S_{Saturation of}、S_Stool、t_{Saturation of}Is a configurable threshold derived from experimental data. The urine absorption saturation of the polymer material in the diaper can also be judged by calculating the sum of the projected areas S1, S2, … and 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 parts marked by oblique line shading from S1, S2 to SN. 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_StoolThe stool can be judged by shading the part. Also when t is₁+t₂Is more than or equal to 1 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 420, and an analog switch set 410, wherein the analog switch set may also be included in the MCU module. The

detection electrodes

203 and 213 are respectively connected into the analog switch group 410 of the control 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 the MCU control chip 420 through the analog switch 410, the active shielding can be formed through the setting of the MCU control chip 420, or the grounding treatment is carried out, the

detection electrodes

203 and 213 are wrapped inside by the electrode 206, so that the influence of the human body and urine in the 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 affected, so that the capacitance data is greatly reduced, and the resistance at the same time is not affected by the human body turning, so that the number of times of unconscious turning of the human body during sleeping can be determined, and a basis is provided for determining the sleeping quality of the human body.

Referring to fig. 16 and 19, which are schematic views of sensors arranged on a diaper and a diaper in a circuitous arrangement respectively, the control device 400 is integrated on a flexible circuit board, and the flexible circuit board is wrapped in a silicone sleeve, or other flexible shell, the silicone sleeve is adhered to the sanitary product 100 or placed in a small pocket on the sanitary product 100 or lapped on the sanitary product 100 through a buckle, fig. 19 only shows the sensors, and a control module can be placed beside the diaper; in fig. 16 and 19, the wires connecting the control unit 400 and the sensor electrodes are not shown, and the snap-fit structure for connecting the sensor electrodes is 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 sanitary product comprises a dry layer, a middle absorption layer and a leakage-proof layer, wherein the middle absorption layer comprises a water absorption layer and/or a high-molecular water locking layer, the dry layer is provided with the excrement detection sensor defined by any technical scheme, and the leakage-proof layer is provided with the control device defined by any technical scheme.

In the technical solution of the above sanitary product, further, one urination and defecation detecting sensor is respectively disposed at the front part and the rear part of the dry layer corresponding to the position where the human body urinates and defecates, as shown in fig. 3, that is, one sensor 200 is respectively disposed at the front part and the rear part of the sanitary product, and is connected to the controller through a cable, and the controller and the connecting device are not shown in the figure.

Claims

1. The utility model provides a stool and urine detection device, includes stool and urine detection sensor and continuous controlling means, its 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; 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 two detection electrodes to a capacitance input port of the control chip and an excitation port of the control chip; the detection of the resistance change is that the analog switch respectively accesses two detection electrodes to VCC and an AD detection port of the control chip, an excitation end of the control chip comprises a capacitance excitation signal circuit, and the capacitance excitation signal circuit generates a high-frequency square wave excitation signal; the control device judges the saturation condition of excrement and/or urine absorption according to the resistance change and the capacitance change between the two detection electrodes, and outputs alarm information.

2. The urination and defecation detecting device according to claim 1, wherein: the induction gap forms a continuous bending groove between the upper and lower insulating layers.

3. The urination and defecation detecting device according to claim 1, wherein: the width of the sensing gap at the detection electrode is larger than the width of the sensing gap at the upper and lower insulating layers.

4. The urination and defecation detecting device according to claim 1, wherein: and a skin-friendly layer covers the upper surface of the upper insulating layer or the upper surface of the upper insulating layer is of a skin-friendly structure.

5. The urination and defecation detecting device according to claim 1, wherein: the induction gap extends from the lower insulating layer to the upper insulating layer, and at least one of the two detection electrodes, the induction gap and the upper and lower insulating layers is intermittently provided with an insulating support.

6. The urination and defecation detecting device according to claim 1, wherein: the width of the induction gap is 2-5mm, and the depth is 0.5-3 mm; 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 0.3-1 mm.

7. The urination and defecation detecting device according to claim 1, wherein: the urine and feces 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 detection electrode and the lower surface of the insulating layer below the detection electrode.

8. The urination and defecation detecting device 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. The urination and defecation detecting device according to claim 1, wherein: the sensing gap extends to an upper skin-friendly layer.

10. The urination and defecation detecting device according to claim 1, wherein: the control circuit 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 resistance is detected by the analog switch respectively accessing the two detection electrodes into VCC and an AD detection port of the control chip.

11. The urination and defecation detecting device according to claim 10, 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.

12. The urination and defecation detecting device according to claim 10, wherein: the pins of the MCU control chip are provided with devices which can be configured to detect the resistance and/or the capacitance simultaneously and/or in a time-sharing manner.

13. A faecal hygiene product according to claim 1, wherein: by measuring the change of electrode resistance with time and then 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_StoolWhen 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 is₂≥t_{Saturation of}When the sanitary product is in a saturated state; when t is₁+t₂Is 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, t₁Is 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 value₂When t is₁The 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.

14. The utility model provides a hygienic product, includes dry and comfortable layer, middle absorbed layer and leak protection layer, its characterized in that: the dry layer is provided with a urination and defecation detecting sensor of the detecting device defined in any one of claims 1 to 13, and the leakage-proof layer is provided with a control device of the detecting device defined in any one of claims 1 to 13.

15. The sanitary product of claim 14, wherein: the excrement and urine detection sensors are respectively arranged at the positions of the front part and the rear part of the dry layer, which correspond to the human body and generate excrement and urine.

16. The sanitary product of claim 14, wherein: the middle absorbing layer comprises a water absorbing layer and/or a polymer water locking layer.