Dehydration amount real-time monitoring module and hemodialysis sickbed

Abstract

The utility model discloses a dehydration amount real-time monitoring module and a hemodialysis sickbed, the dehydration amount real-time monitoring module comprises a weighing sensor, a signal amplification module and a signal processing module, the signal amplification module adopts an HX711 chip, and the signal processing module comprises a microcontroller and a Bluetooth module; the weighing sensor is connected to an A + pin and an A-pin of the HX711 chip, an input signal is amplified by a differential amplifier arranged in the HX711 chip and converted by an A / D converter arranged in the HX711 chip and then is output to an I / O port of the microcontroller through a DOUT pin of the HX711 chip, and meanwhile, an SCK pin of the HX711 chip outputs a clock signal to the I / O port of the microcontroller so as to synchronously convert data; and the microcontroller is correspondingly connected with an RXD pin and a TDX pin of the Bluetooth module so as to realize a wireless communication function. The dehydration amount real-time monitoring module can measure the body weight change of the patient and monitor the dehydration state of the patient in real time according to dehydration parameters.

Description

Technical Field

[0001] The utility model belongs to the field of medical treatment and electronic circuit design technology, and in particular relates to a dehydration real-time monitoring module and a hemodialysis bed. Background Art

[0002] The amount of urine of hemodialysis patients decreases, and the increase of water in the body can cause high blood pressure, excessive heart function load and other hazards, so the dehydration function of the hemodialysis machine is needed. The drawn blood is dehydrated under negative pressure when passing through the dialyzer. During the dialysis process, as the dehydration treatment proceeds, the weight decreases accordingly. Excessive dehydration will cause the patient's blood to drop rapidly and cause discomfort, so the amount of dehydration needs to be accurately controlled. There are generally two ways to monitor the patient's dehydration: hemodialysis machine flow monitoring and weighing the patient before and after hemodialysis. It is difficult for critically ill patients to be weighed. The utility model provides a dehydration real-time monitoring module and a hemodialysis bed. Patients can monitor their weight and dehydration in real time while on dialysis, which brings convenience to critically ill patients who have difficulty weighing on the scale. At the same time, the monitored weight can be compared with the dehydration parameters of the hemodialysis machine, which directly and truly reflects the patient's weight and dehydration. Utility Model Content

[0003] In view of the above-mentioned defects, the utility model provides a dehydration real-time monitoring module and a hemodialysis bed, which can monitor the weight of the patient in the dialysis state in real time.

[0004] A hemodialysis bed for real-time monitoring of dehydration comprises a weighing sensor, a signal amplification module and a signal processing module, wherein the signal amplification module adopts an HX711 chip, and the signal processing module comprises a microcontroller and a Bluetooth module; the weighing sensor is connected to the A+ and A- pins of the HX711 chip, and the input signal is amplified by a differential amplifier built into the HX711 chip and converted by a built-in A / D converter, and then output by a DOUT pin of the HX711 chip to an I / O port of the microcontroller, and at the same time, an SCK pin of the HX711 chip outputs a clock signal to the I / O port of the microcontroller to synchronously convert data; the microcontroller is correspondingly connected to the RXD pin and TDX pin of the Bluetooth module to realize wireless communication function.

[0005] Preferably, the weighing sensor adopts a piezoresistive bridge sensor, and the four interfaces on the bridge correspond to the E+, E-, A-, and A+ pins of the HX711 chip.

[0006] Preferably, the microcontroller is a MSP430F149 minimum system.

[0007] Preferably, the Bluetooth module is an AT-09 Bluetooth 4.0 BLE module.

[0008] A hemodialysis bed comprises the above-mentioned real-time monitoring module for dehydration, and also comprises a bed board and bed legs, wherein the weighing sensor is mounted on the bed legs, and the signal amplification module and the signal processing module are mounted under the bed board.

[0009] Preferably, the number of weighing sensors is 4, corresponding to the 8 I / O ports of the microcontroller. The microcontroller collects the electrical signals of the 4 weighing sensors of the 4 bed legs and superimposes them to output the total weight.

[0010] Preferably, the signal processing module is also provided with a K1 button for clearing and a K2 button for starting dehydration.

[0011] Preferably, the signal processing module is also connected to a buzzer, and when the weight difference between the front and rear of the weighing sensor reaches a preset threshold, the buzzer is used to give a reminder.

[0012] The beneficial effects of the utility model are:

[0013] The utility model discloses a dehydration real-time monitoring module and a hemodialysis bed. The patient can monitor the weight and dehydration in real time under the dialysis state, which brings convenience to seriously ill patients who have difficulty in weighing themselves. At the same time, the monitored weight can be compared with the dehydration parameters of the hemodialysis machine, which can reflect the patient's weight and dehydration in the most direct and real way. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings required for use in the embodiments are briefly introduced below.

[0015] Figure 1 This is an overall schematic diagram of a hemodialysis bed for real-time monitoring of dehydration amount according to an embodiment of the utility model;

[0016] Figure 2 This is a pressure signal processing circuit diagram of an embodiment of the utility model.

[0017] Reference numerals:

[0018] 1: weighing sensor, 2: wire, 3: HX711 module, 4: signal receiving, processing and transmitting module, 5: bed board, 6: wheels, 7: bed legs. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] like Figure 1 As shown, a dehydration amount real-time monitoring module includes a weighing sensor, a signal amplification module and a signal processing module which are electrically connected in sequence. The weighing sensor converts the front and rear weight difference into a voltage difference and inputs it into the signal amplification module for amplification and digital conversion, and then reads and wirelessly transmits it based on the signal processing module.

[0021] Among them, the weighing sensor uses a bridge sensor; the signal amplification module uses the HX711 chip, which is a 24-bit A / D converter chip that integrates peripheral circuits required by other chips of the same type, including a voltage regulator, an on-chip clock oscillator, etc., and has the characteristics of high integration, fast response speed, and strong anti-interference. The microcontroller uses the MSP430F149 minimum system, which is a 16-bit single-chip microcomputer with a 12-bit analog-to-digital converter and high precision; the wireless transmission uses the AT-09 Bluetooth 4.0 BLE module, which has ultra-low energy consumption and can be directly connected to the single-chip microcomputer.

[0022] In this embodiment, the circuit part of the dehydration amount real-time monitoring module is as follows:

[0023] The weighing sensor adopts a bridge sensor. The four red, black, white and green wires from the four connectors are connected to one end of the E+, E-, A- and A+ ports of the PCB board respectively; the other end of E+ is connected to the 3-pin of the HX711 chip to provide analog voltage, the other end of E- is grounded, and the other ends of the A- and A+ ports are connected to the 7-pin and 8-pin of the HX711 chip, so that the HX711 chip can access the data of the weighing sensor through the 7-pin and 8-pin. When not loaded, the resistance between the two pins is R, and a basic voltage (VCC / 2) is used as the middle point of the bridge in the bridge sensor. The 11-pin (SCK) and 12-pin (DT) of the HX711 chip are connected to the I / O port of the minimum system, and the RXD port and TDX port of the minimum system are connected to the RXD port and TDX port of the AT-09 Bluetooth 4.0 BLE module.

[0024] Working mode of the dehydration real-time monitoring module:

[0025] When weight is applied to the load cell, the load cell generates an analog voltage on the output pin according to the size of the load. HX711 chip channel A reads the sensor output through the built-in programmable gain amplifier and input multiplexer. The gain amplifier adjusts the size of the input signal and passes this signal to the digital conversion interface circuit. The digital interface circuit converts the analog input signal into a 26-bit digital signal and outputs it through the DOUT pin; the SCK pin is used to synchronize the output data of the converter through the clock signal. The weight data is then read from the DOUT pin using the MSP430F149 minimum system.

[0026] The utility model also discloses a hemodialysis bed, which is equipped with the above-mentioned real-time monitoring module for dehydration, and also includes a bed board 5, wheels 6, and legs 7 of the hemodialysis bed. Four groups of weighing sensors 1 are respectively installed on the four legs 7 of the hemodialysis bed, and the wire 2, HX711 module 3, and signal processing module 4 are installed under the bed board 5. The weighing sensor 1 is connected to the E+, E-, A-, and A+ ports of the HX711 module 3 based on the wire 2. The digital signal after amplification, filtering, and A / D conversion is transmitted to the I / O port of the signal processing module 4 (MSP430F149 minimum system) through the DT and SCK ports. Figure 1 , Figure 2 As shown in the figure, four groups of pressure sensors and HX711 modules correspond to the eight I / O ports of the minimum system of MSP430F149, and the collected electrical signals are superimposed to calculate the total weight. The signal processing module is equipped with buttons for clearing and other settings before the patient goes to bed. Before the patient goes to bed, the personal belongings and patient treatment items are placed beside the bed, and the K1 button is pressed to clear. The weight after the patient goes to bed is the patient's dry weight. Because after the blood is drawn through the pipeline, there is about 100 ml of blood volume in the pipeline, and it is the load-bearing part of the hemodialysis machine. It will return to the patient's body when the blood is returned and the machine is removed in the later stage. When the venous return end is connected to the patient to start hemodialysis treatment, press K2, dehydration begins, and the dehydration amount is monitored. After pressing the K2 button, the microcontroller MSP430F149 will transmit the dehydration value obtained and calculated through the Bluetooth AT-09 Bluetooth 4.0 BLE module. At this time, the data can be viewed in real time through the Bluetooth serial port software on the mobile phone. The time interval for the weighing sensor to collect signals can be set, for example, sampling is performed once a minute, and the samples are sent through the Bluetooth module after processing. When the dehydration amount reaches 95% completion rate, a buzzer reminder can be issued to remind medical staff and patients that the dehydration amount is about to reach the target value.

[0027] 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 dehydration real-time monitoring module, characterized in that: It includes a weighing sensor, a signal amplification module and a signal processing module, wherein the signal amplification module adopts an HX711 chip, and the signal processing module includes a microcontroller and a Bluetooth module; The weighing sensor is connected to the A+ and A- pins of the HX711 chip. The input signal is amplified by the built-in differential amplifier of the HX711 chip and converted by the built-in A / D converter, and then output by the DOUT pin of the HX711 chip to the I / O port of the microcontroller. At the same time, the SCK pin of the HX711 chip outputs a clock signal to the I / O port of the microcontroller to synchronously convert data; the microcontroller is correspondingly connected to the RXD pin and TDX pin of the Bluetooth module to realize wireless communication function.

2. The dehydration amount real-time monitoring module according to claim 1, characterized in that: The weighing sensor uses a piezoresistive bridge sensor, and the four interfaces on the bridge correspond to the E+, E-, A-, and A+ pins of the HX711 chip.

3. The dehydration real-time monitoring module according to claim 1, characterized in that: The microcontroller is the MSP430F149 minimum system.

4. The dehydration real-time monitoring module according to claim 1, characterized in that: The Bluetooth module is AT-09 Bluetooth 4.0 BLE module.

5. A hemodialysis bed, characterized in that: The dehydration real-time monitoring module based on any one of claims 1 to 4 further comprises a bed board and bed legs, wherein the weighing sensor is installed on the bed legs, and the signal amplification module and the signal processing module are installed under the bed board.

6. The hemodialysis bed according to claim 5, characterized in that: The number of the weighing sensors is 4, corresponding to the 8 I / O ports of the microcontroller. The microcontroller collects the electrical signals of the 4 weighing sensors of the 4 bed legs and superimposes them to output the total weight.

7. The hemodialysis bed according to claim 5, characterized in that: The signal processing module is also provided with a K1 button for clearing and a K2 button for starting dehydration.

8. The hemodialysis bed according to claim 5, characterized in that: The signal processing module is also connected to a buzzer, and when the detected front and rear weight difference reaches a preset threshold, the buzzer alarms.

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