Delivery process uterine contraction pressure monitoring device based on flexible sensor

Abstract

The invention discloses a delivery process uterine contraction pressure monitoring device based on a flexible sensor, which comprises a waist supporting soft cushion, an elastic staylace and an external display terminal with data receiving and displaying functions, adjustable connecting pieces which are matched with each other are arranged between the two ends of the elastic staylace and the connecting band, a flexible cloth layer is connected between the two elastic staylaces, a flexible sensor array is arranged on the inner side of the flexible cloth layer, and the flexible sensor array can cover the uterus body and the cervix uteri area and is distributed in a gradient mode along the uterine contraction propagation path. And a signal processing module is embedded in the elastic staylace. Uterine contraction pressure changes of different positions of the abdomen of a puerpera can be sensed more comprehensively through the flexible sensor array, the attaching layer of the flexible sensing patch is tightly attached to the abdomen of the puerpera, even if the body position of the puerpera changes, the stable attaching state can be kept, measurement errors are reduced, and compared with traditional external monitoring equipment, the measurement precision is remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of medical monitoring, and in particular to a flexible sensor-based uterine contraction pressure monitoring device during childbirth. Background Art

[0002] Before labor begins, the uterus will begin to contract regularly, and these contractions will gradually increase over time. At first, the contractions may be weak, short-lived, and spaced out, but as labor approaches, they will become stronger, more regular, and more persistent. When the contractions reach the above range and the regular contractions continue for a period of time, the mother's cervix will gradually shorten and dilate, which is an important signal that the body is preparing for labor.

[0003] During childbirth, accurate monitoring of uterine contraction pressure is crucial for assessing the progress of labor and ensuring the safety of mother and baby. At present, the commonly used methods for monitoring uterine contraction pressure in clinical practice are mainly external monitoring and internal monitoring.

[0004] Among them, the internal monitoring method is to insert a pressure catheter into the uterine cavity through the cervix to directly measure the intrauterine pressure. However, this method is an invasive operation, which increases the risk of maternal infection and also causes certain pain to the parturient. Therefore, its application is subject to certain restrictions and is generally only used when necessary.

[0005] The external monitoring method indirectly measures uterine contraction pressure by placing a pressure sensor on the abdomen of the parturient. The advantages of this method are that it is non-invasive, simple to operate, and easy for parturients to accept. However, the sensors and fixed parts of the external monitoring equipment are usually relatively hard. Wearing them for a long time will cause obvious pressure and discomfort to the abdomen of the parturient, limit the freedom of movement of the parturient during delivery, and are not conducive to the parturient maintaining a good mental and physical state, which may affect the progress of labor. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a uterine contraction pressure monitoring device during delivery based on a flexible sensor.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] The present invention provides a uterine contraction pressure monitoring device during childbirth based on a flexible sensor, comprising a waist support cushion, an elastic abdominal belt and an external display terminal with data receiving and display functions, wherein connecting belts are extended outwardly from both sides of the waist support cushion, and mutually matching and adjustable connecting pieces are arranged between the two ends of the elastic abdominal belt and the connecting belts, a flexible fabric layer is connected between the two elastic abdominal belts, a flexible sensor array is arranged on the inner side of the flexible fabric layer, the flexible sensor array can cover the uterine body and cervical area, and is distributed in a gradient along the uterine contraction propagation path, a signal processing module is embedded in the elastic abdominal belt, the signal processing module comprises a signal amplification circuit, a filtering circuit and an analog-to-digital conversion unit, and is connected to the flexible sensor array, a wireless data transmission module is arranged on the outside of the elastic abdominal belt, and the external display terminal exchanges information with the signal processing module through the wireless data transmission module, and a battery module for powering the flexible sensor array, the signal processing module and the wireless data transmission module is also arranged on the outside of the elastic abdominal belt, and the power supply module has two modes of power supply: power line power supply and lithium battery power supply.

[0009] As a preferred technical solution of the present invention, the flexible sensor array is composed of a plurality of flexible sensor patches, and the flexible sensor patches include a stretchable substrate, a flexible pressure sensor and a bonding layer arranged in sequence from top to bottom;

[0010] The stretchable substrate is a polydimethylsiloxane film with a thickness of 0.3 mm, an elongation at break of ≥500%, a tensile modulus of 1-2 MPa, and satisfies the following formula:

[0011]

[0012] In formula 1, E is the elastic modulus, ε is the strain, and β is the strain rate sensitivity coefficient;

[0013] The flexible pressure sensor is made of piezoresistive flexible material, and its piezoresistive characteristics satisfy the following formula:

[0014] ΔR = k·σ (Formula 2);

[0015] In formula 2, ΔR is the resistance change, σ is the pressure, and k is the piezoresistance coefficient of the material.

[0016] As a preferred technical solution of the present invention, the surfaces of the stretchable substrate and the flexible fabric layer are both provided with micropores, and the micropores are aligned to form a through-type air permeable channel;

[0017] The surface of the flexible fabric layer is covered with a nano-silver antibacterial coating;

[0018] The bonding layer is made of thermosensitive hydrogel and has a micro-column array on its surface with a contact angle of ≤30°.

[0019] As a preferred technical solution of the present invention, an electric heating layer is provided in the middle of the lumbar support cushion, and the electric heating layer is made of a graphene electric heating film.

[0020] As a preferred technical solution of the present invention, the inner side of the elastic abdominal band and the connecting belt cooperate with each other and the adjustable connecting parts are a buckle belt and a row of buckles, the buckle belt is sewn on the inner side of the elastic abdominal band, the row of buckles is sewn on the outer side of the connecting belt, and the row of buckles has multiple rows, and the tightness can be adjusted by adjusting the buckle belt to connect with the rows of buckles at different positions;

[0021] Both ends of the elastic abdominal band are provided with Velcro tapes for bonding with each other.

[0022] As a preferred technical solution of the present invention, the external display terminal is built with a data analysis module and an alarm module. After receiving the data, the data analysis module performs real-time analysis on the uterine contraction pressure data, calculates parameters such as the frequency, intensity, and duration of the uterine contraction, and determines whether the uterine contraction is normal according to a preset threshold value;

[0023] The data analysis module adopts a machine learning algorithm to establish a uterine contraction prediction model by learning and training a large amount of historical uterine contraction data, which can predict the development trend of uterine contraction in advance;

[0024] When the uterine contraction parameters exceed the normal range, the alarm module sends out an alarm signal to remind medical staff to deal with it in time.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1: The present invention can more comprehensively sense the changes in uterine contraction pressure at different positions of the parturient's abdomen through the flexible sensor array. The bonding layer of the flexible sensor patch fits tightly to the parturient's abdomen, and can maintain a stable bonding state even if the parturient's body position changes, thereby reducing measurement errors. Compared with traditional external monitoring equipment, the measurement accuracy is significantly improved.

[0027] 2: The flexible sensing patch of the present invention is designed with flexible materials as a whole. It is thin and soft, and will not cause obvious pressure on the abdomen of the parturient. It can bend naturally with the ups and downs of the abdomen of the parturient, which greatly improves the comfort of wearing, helps to relieve the tension of the parturient, and promotes the smooth progress of the delivery process.

[0028] 3: The lumbar support cushion of the present invention can support the waist of the mother when she is lying down and apply heat to relieve waist pain. At the same time, the elastic abdominal belt part can also be separated from it, so that it can be used when getting out of bed to walk or doing prenatal exercises, and the usage scenarios are more comprehensive. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 It is a schematic diagram of the internal structure of the elastic abdominal belt and the flexible fabric layer of the present invention;

[0032] Figure 3 is a schematic diagram of the structure of the flexible sensing patch of the present invention;

[0033] Figure 4 is a schematic diagram of signal transmission of the present invention;

[0034] Figure 5 This is a schematic diagram of the state of a lying-down woman in the embodiment;

[0035] In the figure: 1. Lumbar support pad; 2. Elastic abdominal belt; 3. External display terminal; 4. Flexible fabric layer; 5. Flexible sensor array; 6. Signal processing module; 7. Wireless data transmission module; 11. Connecting belt; 12. Electric heating layer; 51. Stretchable base; 52. Flexible pressure sensor; 53. Laminating layer. DETAILED DESCRIPTION

[0036] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0037] Example 1

[0038] like Figure 1-5As shown, the present invention provides a uterine contraction pressure monitoring device during delivery based on a flexible sensor, comprising a waist support cushion 1, an elastic abdominal belt 2 and an external display terminal 3 with data receiving and display functions, both sides of the waist support cushion 1 are extended outward with connecting belts 11, and mutually matching and adjustable connecting parts are arranged between the two ends of the elastic abdominal belt 2 and the connecting belt 11, a flexible fabric layer 4 is connected between the two elastic abdominal belts 2, and a flexible sensor array 5 is arranged on the inner side of the flexible fabric layer 4, the flexible sensor array 5 can cover the uterine body and cervical area, and is distributed in a gradient along the uterine contraction propagation path, and a signal processing module 6 is embedded in the elastic abdominal belt 2, and the signal processing module 6 includes a signal amplification circuit, The filter circuit and the analog-to-digital conversion unit, the amplifier circuit is used to amplify the weak electrical signal output by the flexible sensor array 5, the filter circuit adopts a Butterworth low-pass filter to filter out high-frequency noise, the analog-to-digital conversion unit converts the analog signal into a digital signal and is connected to the flexible sensor array 5, the outside of the elastic abdominal band 2 is provided with a wireless data transmission module 7, including a Bluetooth module or a WiFi module, the external display terminal 3 exchanges information with the signal processing module 6 through the wireless data transmission module 7, and the outside of the elastic abdominal band 2 is also provided with a battery module for powering the flexible sensor array 5, the signal processing module 6 and the wireless data transmission module 7, and the power supply module has two modes of power supply: power line power supply and lithium battery power supply.

[0039] Further, the flexible sensor array 5 is composed of a plurality of flexible sensing patches, and the flexible sensing patches include a stretchable substrate 51, a flexible pressure sensor 52 and a bonding layer 53 arranged in sequence from top to bottom;

[0040] The stretchable substrate 51 is a polydimethylsiloxane film, which has high elasticity and tear strength, a thickness of 0.3 mm, an elongation at break of ≥500%, a tensile modulus of 1-2 MPa, and satisfies the following formula:

[0041]

[0042] In formula 1, E is the elastic modulus, ε is the strain, and β is the strain rate sensitivity coefficient;

[0043] The flexible pressure sensor 52 is made of piezoresistive flexible material, and its piezoresistive characteristic satisfies the following formula:

[0044] ΔR = k·σ (Formula 2);

[0045] In formula 2, ΔR is the resistance change, σ is the pressure, and k is the piezoresistance coefficient of the material. Here, the piezoresistance coefficient k is 15.

[0046] Furthermore, micropores are provided on the surfaces of the stretchable substrate 51 and the flexible fabric layer 4, and the micropores are aligned to form a through-type ventilation channel, which can reduce skin humidity and avoid the generation of damp heat;

[0047] The surface of the flexible fabric layer 4 is covered with a nano-silver antibacterial coating, which can inhibit pathogenic microorganisms such as Staphylococcus aureus and reduce the risks of redness, swelling, infection, etc.;

[0048] The fitting layer 53 is made of thermosensitive hydrogel and has a micro-column array on its surface with a contact angle of ≤30°, ensuring a low impedance connection with the skin.

[0049] Furthermore, an electric heating layer 12 is provided in the middle of the lumbar support cushion 1, and the electric heating layer 12 is made of a graphene electric heating film; the lumbar support cushion 1 is made of high-density memory foam.

[0050] Furthermore, the inner side of the elastic corset 2 and the connecting belt 11 are matched and adjustable connecting parts, which are a buckle belt and a row of buckles. The buckle belt is sewn on the inner side of the elastic corset 2, and the row of buckles is sewn on the outer side of the connecting belt 11. The row of buckles has multiple rows, and the tightness can be adjusted by adjusting the buckle belt to connect with the row of buckles at different positions.

[0051] Both ends of the elastic abdominal band 2 are provided with Velcro for bonding with each other.

[0052] Furthermore, the external display terminal 3 has a built-in data analysis module and an alarm module. After receiving the data, the data analysis module performs real-time analysis on the uterine contraction pressure data, calculates parameters such as the frequency, intensity, and duration of the uterine contraction, and determines whether the uterine contraction is normal based on a preset threshold value;

[0053] The data analysis module uses a machine learning algorithm to establish a uterine contraction prediction model by learning and training a large amount of historical uterine contraction data. It can predict the development trend of uterine contractions in advance. The machine learning algorithm is based on LSTM, and the network structure of LSTM is:

[0054] The number of neurons in the input layer is 5, which are: pressure, temperature, humidity, time, and body position;

[0055] The number of neurons in the hidden layer is 10;

[0056] The number of neurons in the output layer is 1, which is the predicted value of contraction intensity;

[0057] The number of training rounds is 1000, and the learning rate is 0.001;

[0058] The dataset includes 1,000 sets of clinical data, including 700 sets of normal uterine contractions and 300 sets of abnormal uterine contractions;

[0059] When the uterine contraction parameters exceed the normal range, the alarm module sends an alarm signal to remind medical staff to deal with it in time.

[0060] Specifically, when the mother lies down, refer to Figure 5First, lay the lumbar support cushion 1 flat, and the parturient lies on it so that the lumbar support cushion 1 can support the lower back. Then, the medical staff cleans the parturient's abdominal skin with a mild detergent to remove grease and dirt, and then wipes it dry with a clean towel.

[0061] Take out part of the flexible fabric layer 4, which is a blended fabric of polyamide fiber and spandex. The flexible sensor array 5 is distributed in a gradient along the path of contraction transmission. Tear off the protective film on the surface of the laminating layer 53, and apply it to the uterine body area, with a spacing of 3-4 cm between each other. The specific arrangement is: 3-4 transversely arranged at the bottom corner of the uterus, 2 transversely arranged at both ends of the uterine body, and 2 transversely arranged at both ends of the cervix. After the laminating is completed, the elastic abdominal belt 2 at both ends is connected to the connecting belt 11 of the waist support cushion 1, and the position of the buckle on the row of buckles is adjusted to adjust the tightness, so that the elastic abdominal belt 2 can remain stable without causing excessive pressure. Start the electric heating layer 12 to heat the waist of the parturient, and adjust the temperature to 32-35°C to provide comfortable support for the parturient and relieve waist pain.

[0062] When the parturient needs to get out of bed and walk around, or do prenatal exercises, the elastic abdominal belt 2 is separated from the waist support cushion 1. The monitoring part is worn on the body through the Velcro at both ends of the elastic abdominal belt 2, which is powered by a lithium battery to meet the different usage needs of the parturient.

[0063] During the detection process, the flexible pressure sensor 52 collects the pressure data of the parturient during uterine contraction in real time, and transmits it from the uterine fundus to the cervix based on the uterine contraction propagation path. After data collection, the data is transmitted to the signal processing module 6, which amplifies, filters, and performs analog-to-digital conversion on the collected signal, and then sends the processed data to the external display terminal 3 through the wireless data transmission module 7.

[0064] After receiving the data, the built-in data analysis module of the external display terminal 3 immediately performs real-time analysis on the uterine contraction pressure data. The LSTM network algorithm is used to calculate the frequency, intensity, duration and other parameters of the uterine contraction, and whether the uterine contraction is normal is determined according to the preset threshold. At the same time, the uterine contraction prediction model previously established by learning and training a large amount of historical uterine contraction data is used to predict the development trend of uterine contraction in advance. For example, if the data analysis module detects that the frequency of uterine contractions suddenly accelerates, the intensity increases significantly, and the duration is prolonged, exceeding the preset normal range, it will be judged as an abnormal uterine contraction. The various parameters and prediction results of uterine contractions will be displayed in real time on the screen of the external display terminal, and presented to medical staff in the form of intuitive charts and numbers.

[0065] When the alarm module detects that the uterine contraction parameters are beyond the normal range, it will immediately send out an audible and visual alarm signal to remind medical staff to deal with it in time. After receiving the alarm signal, the medical staff will quickly check the detailed data on the external display terminal, evaluate the condition of the parturient, and take appropriate measures according to the specific situation, such as adjusting the position of the parturient, giving appropriate drug intervention, etc.

[0066] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A uterine contraction pressure monitoring device during childbirth based on a flexible sensor, comprising a waist support cushion (1), an elastic abdominal belt (2) and an external display terminal (3) with data receiving and display functions, wherein both sides of the waist support cushion (1) are extended outward with connecting belts (11), and mutually matching and adjustable connecting parts are arranged between the inner side of the elastic abdominal belt (2) and the connecting belt (11), characterized in that: A flexible fabric layer (4) is connected between the two elastic abdominal belts (2), and a flexible sensor array (5) is arranged on the inner side of the flexible fabric layer (4). The flexible sensor array (5) can cover the uterine body and cervical area and is distributed in a gradient along the uterine contraction transmission path. A signal processing module (6) is embedded in the elastic abdominal belt (2). The signal processing module (6) includes a signal amplification circuit, a filtering circuit and an analog-to-digital conversion unit, and is connected to the flexible sensor array (5). A wireless data transmission module (7) is arranged on the outside of the elastic abdominal belt (2). The external display terminal (3) exchanges information with the signal processing module (6) through the wireless data transmission module (7). A battery module for powering the flexible sensor array (5), the signal processing module (6) and the wireless data transmission module (7) is also arranged on the outside of the elastic abdominal belt (2). The power supply module has two modes: power supply by a power line and power supply by a lithium battery.

2. A flexible sensor-based uterine contraction pressure monitoring device during childbirth according to claim 1, characterized in that: The flexible sensor array (5) is composed of a plurality of flexible sensing patches, wherein the flexible sensing patches include a stretchable substrate (51), a flexible pressure sensor (52) and a bonding layer (53) which are arranged in sequence from top to bottom; The stretchable substrate (51) is a polydimethylsiloxane film with a thickness of 0.3 mm, an elongation at break of ≥500%, a tensile modulus of 1-2 MPa, and satisfies the following formula: In formula 1, E is the elastic modulus, ε is the strain, and β is the strain rate sensitivity coefficient; The flexible pressure sensor (52) is made of a piezoresistive flexible material, and its piezoresistive characteristic satisfies the following formula: ΔR = k·σ (Formula 2); In formula 2, ΔR is the resistance change, σ is the pressure, and k is the piezoresistance coefficient of the material.

3. A flexible sensor-based uterine contraction pressure monitoring device during childbirth according to claim 2, characterized in that: The surfaces of the stretchable substrate (51) and the flexible fabric layer (4) are both provided with micropores, and the micropores are aligned to form a through-type air permeable channel; The surface of the flexible fabric layer (4) is covered with a nano-silver antibacterial coating; The conforming layer (53) is made of thermosensitive hydrogel and has a micro-column array on its surface, with a contact angle of ≤30°.

4. The flexible sensor-based uterine contraction pressure monitoring device during childbirth according to claim 1, characterized in that: An electric heating layer (12) is provided in the middle of the lumbar support cushion (1), and the electric heating layer (12) is made of a graphene electric heating film.

5. The flexible sensor-based uterine contraction pressure monitoring device during childbirth according to claim 1, characterized in that: The inner side of the elastic abdominal belt (2) and the connecting belt (11) are connected to each other and are adjustable by means of a buckle belt and a row of buckles. The buckle belt is sewn on the inner side of the elastic abdominal belt (2), and the row of buckles is sewn on the outer side of the connecting belt (11). The row of buckles has multiple rows, and the tightness can be adjusted by adjusting the buckle belt to connect with the rows of buckles at different positions. Both ends of the elastic abdominal band (2) are provided with Velcro for bonding with each other.

6. A flexible sensor-based uterine contraction pressure monitoring device during childbirth according to any one of claims 1 to 5, characterized in that: The external display terminal (3) is built with a data analysis module and an alarm module. After receiving the data, the data analysis module performs real-time analysis on the uterine contraction pressure data, calculates parameters such as the frequency, intensity, and duration of the uterine contraction, and determines whether the uterine contraction is normal based on a preset threshold value; The data analysis module adopts a machine learning algorithm to establish a uterine contraction prediction model by learning and training a large amount of historical uterine contraction data, which can predict the development trend of uterine contraction in advance; When the uterine contraction parameters exceed the normal range, the alarm module sends out an alarm signal to remind medical staff to deal with it in time.

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