CN110200763A - A kind of medical suspension bed weighing system and method - Google Patents

Abstract

The invention discloses a weighing system and method for a medical suspension bed. The system is composed of a bed base unit, a tension and pressure sensor support unit, a silicon sand support unit, a silicon sand storage bin, a main control module and a communication module. The tension and pressure sensor bracket unit adopts six high-precision tension and pressure sensors, which are placed on the same horizontal plane and evenly distributed on the bearing points of the suspended bed to collect weighing data in real time. Weighing data should be processed by spline wavelet analysis to eliminate the noise and output weighing data that can assist clinic. According to clinical needs, within the set time range, record and store the patient's weight gain and loss, and give corresponding sound and light alarms. Nurses perform rehydration or adjust rehydration speed according to the recommendations of the built-in expert system. Thanks to the high-precision weighing system and the built-in expert system, it can assist nursing staff to replenish fluids in time, effectively prevent patients from excessive fluid loss and shock, and reduce the work intensity of nursing staff.

Description

A weighing system and method for a medical suspension bed

technical field

The invention belongs to the technical category of medical suspended beds. In particular, it refers to a medical suspended bed that uses six tension and pressure sensors, applies spline wavelet theory to filter out noise, and uses an expert system to process weight signals to assist patients in rehydration.

Background technique

Infection is an important topic in burn surgery. The wound surface of burn patients provides a good medium for bacterial growth, and suitable temperature and humidity are more conducive to the massive reproduction of bacteria on the wound surface. The use of medical suspended bed can effectively reduce the wound infection rate and accelerate wound repair. Medical suspended bed includes control system, cooling system, high temperature heating and disinfection system, weighing system, and includes high-efficiency air inlet filter, heating dryer, high-pressure fan, microporous breathable diffusion plate (PE material), silica sand, special filter Single suspension fluid system. Using the principle of fluid mechanics, the pre-treated clean compressed air is sprayed upwards evenly through the breathable diffusion plate with a large number of micropores (diameter 4-25μm) at the bottom of the bed, passing through and holding up the air in the upper bed. A large amount of fine silica sand (diameter 70-140μm, total mass of silica sand ≈600Kg) forms a state similar to water "boiling" on its surface, and a large number of "sand bubbles" keep rolling upwards to generate buoyancy. The surface of the silica sand is covered with a special filter sheet with a mesh diameter of 35 μm to prevent the silica sand from passing through, and the patient lies on it for treatment. The buoyancy formed by the fluidization of silica sand in the suspended bed can reduce the pressure on the surface area of the patient bed unit and the wound surface; the dry and hot air can be poured onto the wound surface through the filter sheet, drying and inactivating the microbial cells on the filter sheet, and at the same time accelerating the wound surface of the patient. Dry scabs; the patient's exudate is absorbed by the silica sand and coagulates into agglomerates, sinking to the screen at the bottom of the bed, preventing further contact between bacteria and the patient's body surface, and providing good conditions for the healing of burn wounds.

Medical suspended beds are basically divided into two categories: one is sand fluid suspended bed; the other is multi-directional pneumatic suspended bed. Compared with the two, the core components of the former need to consume a large amount of raw materials, the processing technology is complicated, and the technical difficulty is low; the latter does not need to use solid particles, and the processing technology is relatively simple, but the technical threshold is high. Major manufacturers led by the United States have developed multi-directional pneumatic Suspended bed belongs to this kind of products. According to my country's national conditions, the sand fluid suspended bed with low technical difficulty is more suitable for promotion and application in my country and middle-level countries. Imported products include the Clinitron II fluid suspension therapy device produced by HILLROM in the United States, the air jet suspension bed produced by KCL in the United States, and the Redactron suspension burn treatment bed from the Netherlands; domestic medical suspension beds produced by Ningbo Denghuang Medical Equipment Co., Ltd. have a relatively high market share , using sand fluid.

Generally, the medical suspension bed is equipped with a weighing device, including four load cells, which are installed under the four corners of the bracket to collect the weight of the bracket, the tank and the patient. The weight signal is converted by A/D and sent to the CPU for processing and display. , the patient's weight can be measured. Based on the theory of ergonomics and applying the data of "Ergonomic Diagrams", when the human body is lying in bed, only the signals of the four weighing sensors on the head and feet are sampled. Need to add 2 load cells here. In view of the various disturbance factors of the general medical suspended bed, the weighing data has a large error. Nurses dare not use weighing data with large errors when rehydrating burn patients. However, the patient's weight changes need to be replenished in time, so the nursing staff must pay close attention to it for a long time. Burn patients lie on the continuous high-heat airflow and dry filter sheets for a long time, and the water in the body is evaporated in large quantities, and the normal physiological toilet will further aggravate the water loss. In mass burn incidents, the number of medical staff is insufficient, and a large amount of debridement work is likely to cause untimely rehydration; the patient's water and electrolyte imbalance will lead to hypertonic dehydration of the patient, which is life-threatening. Therefore, it is particularly necessary for patients who need to be accurately rehydrated to milliliters to lie on a dynamic suspension bed, display accurate weight changes and timely rehydration alarms.

There are various disturbances in the weighing of the suspended bed, which can be roughly divided into: (1) Loss and volatilization of body fluids in burn patients cause body weight changes. This change process is extremely slow and is characterized by a low frequency signal. There are various electronic components such as sensors and A/D conversion circuits in the dynamic weighing hardware platform, which generate high-frequency signals. Useful low-frequency signals and interfering high-frequency signals are mixed, making it difficult to obtain accurate weighing signals. In order to meet the clinical needs, it is necessary to eliminate the high-frequency noise in the weighing signal. Signal denoising processing is actually a signal filtering process. Wavelet analysis is superior to Fourier analysis, and it has good localization properties in both time domain and frequency domain. The principle is that {V _j } _j∈z is a multiresolution analysis of L ² (R), and W _j is the orthogonal complement space of V _j in V _j+1 . Let _Pj and _Qj be the orthogonal projections of L2 ⁽ R) onto _Vj and _Wj , respectively. Suppose the signal f(t)∈L ² (R), the signal containing noise measured by the instrument is P _j f∈V _j , then there is

The process of decomposing the signal with wavelet transform is the process of gradually separating various frequency components in the signal into different frequency bands from high to low. For B-spline scaling functions As far as the wavelet function ψ is concerned, its frequency bands are approximately [-π, π] and [-2π, -π]U[π, 2π] respectively, therefore, the frequency range of Q _j f is approximately [-2 ^j+1 π, -2 ^j π]U[2 ^j π,2 ^j+1 π]. If the frequency to filter the noise is located in the Q _j f frequency band orientation, it is only necessary to set Q _j f to zero during the signal reconstruction process. According to needs, Q _j f can be further decomposed by wavelet packet decomposition. (2) Interference caused by deformation of load-bearing bracket, patient floating and sand body flow. Generally, the total weight of the medical suspension bed, silica sand and the patient is heavy, about 1 ton, and the length is 2.25m. Especially, the patient’s buttocks and the middle of the bed bear a lot of pressure. Only four corners have fulcrums, and the middle of the bracket is easily deformed. , concave; the patient will also produce a certain range of movement with the fluidized sand; the overall level of the bed, the direction of the airflow, and the patient's center of gravity all have certain disturbances. Various disturbances lead to large errors in the existing weighing system.

The total burn area is greater than 30% of the body surface area or the third-degree burn area is greater than 10% of the body surface area. Or the total area is less than 31%, but one of the following conditions: severe general condition or shock; compound injury or combined injury (such as severe trauma, chemical poisoning, etc.); moderate or severe inhalation injury. More than 5% of the head and face burns of infants and young children. Clinically diagnosed as severe burns. Three measures to reduce the probability of medical accidents in patients with severe burns: Based on the existing structure of the suspended bed, add two high-precision tension and pressure sensors on the patient's buttocks to collect raw data in real time. Using the spline wavelet analysis method, the noise of the original data is eliminated, and the weighing signal that meets the clinical requirements and the error is within the allowable range is output. According to clinical needs, the clinical auxiliary unit can judge the patient's weight gain and loss within the set time range, give corresponding sound and light alarms, and the built-in expert system can judge the fluid replacement or adjust the fluid replacement speed. The representative intellectual property achievements of the weighing system and method of the medical suspension bed are summarized as follows:

·Invention patent "high-precision weighing device for medical suspension bed" (CN201120215066.4), which proposes a high-precision weighing device for medical suspension bed that reduces weighing errors. Four weighing sensors are installed between the bracket and the weighing platform The space is used to bear the weight of the weighing platform, the tank body and the patient, and the measured signal is sent to the CPU for separate processing, and the analog quantity is digitized respectively, so that the patient's weight can be measured.

·Invention patent "double constant laminar flow medical suspension bed" (CN201410598290.4), which proposes a double constant laminar flow medical suspension bed, which can provide a closed chamber with constant temperature and humidity environment and a constant temperature and humidity environment from bottom to top , to ensure that the back and front of the patient are suitable for the humidity and temperature of the treatment environment, and it is an independent recuperation space with mobile functions. Equipped with sterilizing components to ensure that patients are treated in a clean environment.

The above-mentioned beneficial exploration has certain reference value, but the exploration results are still limited. Therefore, it is necessary to conduct in-depth research on the weighing system and usability of the medical suspended bed based on the existing research results.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art and provide a weighing system and method for a medical suspended bed.

The system consists of bed base unit, tension and pressure sensor bracket unit, silicon sand support system, silicon sand storage bin, main control module and communication module; tension and pressure sensor bracket unit includes 2 tension and pressure sensors in each group, 6 tension and pressure sensors in three groups The original weight data collection point of the pressure sensor; the silica sand storage warehouse is equipped with a filter sheet that isolates the silica sand from direct contact with the patient, and the filter sheet is fixed by means of a silicone bead;

The tension and pressure sensor bracket unit consists of 6 tension and pressure sensors, model YP-L1/200Kg, and a bracket for fixing the sensors, one of which is fixed at the fulcrum of the bracket on the right side of the head of the bed, and one tension and pressure sensor is fixed in the bed At the fulcrum of the right bracket, a tension and pressure sensor is fixed at the fulcrum of the right bracket at the end of the bed, a tension and pressure sensor is fixed at the fulcrum of the left bracket at the end of the bed, a tension and pressure sensor is fixed at the fulcrum of the left bracket in the bed, A tension-compression sensor is fixed at the fulcrum of the left bracket of the head of the bed, and the 6 tension-compression sensors are at the same level;

The suspended bed follows the existing mainstream suspended bed structure, adding two tension and pressure sensors in the middle of the bed body. Obtain the data lost due to the deformation in the middle of the bracket, and obtain more comprehensive and accurate weighing data.

The analog signal processing of the tension and pressure sensor uses the 24-bit A/D converter HX711 chip as the core, the power supply is connected to pin 1 and pin 16 of HX711; the base of transistor Q1 is connected to pin 2 of HX711, and the emitter of Q1 is connected to one end of capacitor C1 , the other end of C1 is connected to the ground; the collector of Q1, pin 1 of the pull-pressure sensor, one end of R1, and one end of C2 are connected to pin 3 of HX711; the other end of R1 and one end of R2 are connected to pin 4 of HX711; the other end of R2, The other end of C2 and one end of C3 are connected to pin 5 of HX711 and grounded; the other end of C3 is connected to pin 6 of HX711; one end of C4 and one end of R3 are connected to pin 7 of HX711, and the other end of R3 is connected to pin 3 of the tension and pressure sensor; R4 One end of C4 and the other end of C4 are connected to pin 8 of HX711, and the other end of R4 is connected to pin 4 of the tension and pressure sensor; terminal DI201 is connected to pin 12 of HX711, and connected to the main control unit ATmega128 pin 60; terminal DO201 is connected to pin 11 of HX711 , Correspondingly access the main control unit ATmega128 pin 36. For the convenience of description, the other sensors are DI202, DI203, DI204, DI205, DI206 at the input end of the main control unit; DO202, DO203, DO204, DO205, DO206 at the output end, also adopt 24-bit A/D converter HX711 chip, peripheral circuit Similar.

Described main control module is core with ATmega128 chip, and ATmega128 pin 60,59,58,57,56,55 are connected with terminal DI ₂₀₁ , DI ₂₀₂ , DI ₂₀₃ , DI ₂₀₄ , DI ₂₀₅ , DI ₂₀₆ respectively; ATmega128 pin 36 , 37, 38, 39, 40, 41 are respectively connected with terminals DO ₂₀₁ , DO ₂₀₂ , DO ₂₀₃ , DO ₂₀₄ , DO ₂₀₅ , DO ₂₀₆ ; the main control module is connected with the monitoring center through the communication module.

The tension and pressure sensor transmits the original weight data into the MCU, and adopts the suspended bed weighing analysis method based on spline wavelet denoising, including the following steps:

(1) collecting the weighing signal of the suspended bed;

(2) Store the weighing signal of the suspended bed;

(3) extract the suspended bed weighing data after denoising processing of the weighing data collected;

(4) Extract the weighing signal of the suspended bed at t minutes and t+15 minutes, and send the difference to the MCU for processing.

Described step (3) comprises the following steps:

(3-1) Carry out wavelet decomposition to the original suspended bed weighing signal with the number of layers as 4 layers to obtain wavelet high frequency layer and wavelet low frequency layer;

(3-2) In the second wavelet low-frequency layer, the general threshold is used to filter the original suspended bed weighing signal:

For the signal point S to be processed, select the domain range of k steps;

Create k patterns with point S as the reference point, calculate the arithmetic mean value of the absolute value of the data within the range of each pattern, select the maximum average value as the characteristic value of point S, and replace the original point S with the characteristic value of point S amplitude;

Compare the eigenvalue of point S after replacement with the general threshold, when the eigenvalue of point S is greater than the general threshold, all the signal points retain the original amplitude; when the eigenvalue of point S is less than or equal to the general threshold, zero the signal point ;

k is a natural number, and the maximum value of k is half of the signal pulse width;

The formula for calculating the general threshold σ is:

σ is the noise standard deviation, n is the length of the signal;

The arithmetic mean calculation formula is:

(3-3) Clear the wavelet high-frequency layer to zero, and filter out high-frequency noise and 50hz power frequency noise;

(3-4) Reconstruct to obtain the extracted original suspended bed weighing signal, which is used as the input signal of the original suspended bed weighing signal in the next step.

The application method of the weighing data of the medical suspended bed weighing system to assist clinical infusion is characterized in that it comprises the following steps:

1) Turn on the power supply of the suspended bed, check the operation records of the expert system of the suspended bed, the weighing system will display the weight of the unsuspended state in real time, including the weight of the upper bed body and granular material, turn on the fan system, and the weighing system will display the weight of the suspended state in real time, In this state, after the weighing system is cleared, the patient is placed on the suspension bed, and the weighing system displays the weight of the patient, part of the infusion tube and the gauze bound. Let this time point be t ₀ and the weight be G ₀ ; t ₀ +Δt (the general clinical setting of Δt is 15 minutes), and the weight increases to G ₀ +ΔG (the clinical general setting of ΔG is 500 grams);

2) The weighing system reads G ₀ , and sets Δt and ΔG values;

3) Judge whether ΔG is positive or negative;

3-1) Judging that ΔG is positive;

3-1-1) Increase infusion, yes, the green light is on, return to 3); no, enter 3-1-2;

3-1-2) Increase nasal feeding, yes, the green light is on, return to 3); no, enter 3-1-3;

3-1-3) eat, yes, the green light is on, return to 3); no, enter 3-1-4;

3-1-4) water in, yes, the green light is on, return to 3);

3-2) When it is judged that ΔG is negative;

3-2-1) The wound evaporates, yes, alarm, red light is on, enter 4); no, return to 3);

Wound oozing blood, yes, alarm, red light on, enter 4); no, return to 3);

Wound exudate, yes, alarm, red light on, enter 4); no, return to 3);

Vomiting, yes, alarm, red light on, enter 4); no, return 3);

Stool, yes, alarm, red light on, enter 4); no, return to 3);

Urinate, yes, alarm, red light on, enter 4); no, return to 3);

Sweating, yes, alarm, red light on, enter 4); no, return to 3);

Tracheal evaporation, yes, alarm, red light on, enter 4); no, return to 3);

VSD drainage, yes, alarm, red light on, enter 4); no, return to 3);

Dialysis, yes, alarm, red light on, enter 4); no, return 3);

4) Confirmed by the medical staff, the alarm is valid, and the fluid is replenished; return to 3).

Compared with the background technology, the present invention has the beneficial effects of:

This system adds two high-precision tension and pressure sensors on the patient's buttocks, that is, in the middle of the bed body, to avoid losing the signal of the middle buttocks, which occupy the main weight of the human body. The original sampling weight data is processed by the spline wavelet analysis method to further eliminate the noise and interference, and output the weighing signal that meets the clinical requirements and the error is within the allowable range. According to the clinical needs, the expert system can judge the patient's weight gain and loss within the set time range, and give corresponding sound and light alarms. According to the built-in process, the medical staff judges the rehydration or adjusts the rehydration speed. Thanks to the high-precision weighing system and the suspended bed expert system, it can effectively assist medical staff to replenish fluids in a timely manner, prevent patients from dying of shock due to excessive fluid loss, reduce the work intensity and pressure of medical staff, and eliminate the hidden danger of medical accidents.

Description of drawings

Fig. 1 is a front view and a top view of a medical suspended bed;

Fig. 2 is the A/D conversion circuit diagram of the high-precision tension and pressure sensor;

Fig. 3 is a main control unit circuit diagram;

Fig. 4 is the signal diagram without spline wavelet denoising;

Fig. 5 is the signal diagram through spline wavelet denoising;

Fig. 6 is a weighing signal flow chart;

Fig. 7 is a flow chart of the working mode of the suspended bed expert system.

In the figure, the bed base unit 100, tension and pressure sensor bracket unit 200, full sand support system 300, sand storage bin 400, silicone layer 500; main control module 600 and communication module 700, the first tension and pressure sensor 201 and its fulcrum 21 , the second tension and pressure sensor 202 and its fulcrum 22, the third tension and pressure sensor 203 and its fulcrum 23, the fourth tension and pressure sensor 204 and its fulcrum 24, the fifth tension and pressure sensor 205 and its fulcrum 25, the first 6 tension and pressure sensors 206 and their fulcrums 26; the first tension and pressure sensor is input to the signal terminal DI ₂₀₁ of the main control unit, the second tension and pressure sensor is input to the signal terminal DI ₂₀₂ of the main control unit, and the third tension and pressure sensor is input to the main control unit Signal terminal DI ₂₀₃ , the fourth tension and pressure sensor input main control unit signal terminal DI ₂₀₄ , the fifth tension and pressure sensor input main control single signal terminal DI ₂₀₅ , the sixth tension and pressure sensor input main control unit signal terminal DI ₂₀₆ ; The signal terminal of the main control unit to the first tension and pressure sensor is DO ₂₀₁ , the signal terminal of the main control unit to the second tension and pressure sensor is DO ₂₀₂ , and the signal terminal of the main control unit to the third tension and pressure sensor is DO ₂₀₃ , The main control unit outputs to the fourth tension and pressure sensor signal terminal DO ₂₀₄ , the main control unit outputs to the fifth tension and pressure sensor signal terminal DO ₂₀₅ , and the main control unit outputs to the sixth tension and pressure sensor signal terminal DO ₂₀₆ .

Detailed ways

As shown in Figure 1, the system is made up of bed base unit 100, tension and pressure sensor bracket unit 200, silicon sand support unit 300, silicon sand storage bin 400, main control module 600 and communication module 700; tension and pressure sensor bracket unit 200 includes each 2 tension and pressure sensors in one group, and 6 tension and pressure sensors in three groups for raw weight data collection points; the silica sand storage bin 400 is equipped with a filter sheet that isolates the silica sand from direct contact with the patient, and the filter sheet is fixed with the help of a silicone bead 500;

The tension and pressure sensor bracket unit 200 includes 6 tension and pressure sensors, model YP-L1/200Kg, and a bracket for fixing the sensors, wherein the tension and pressure sensor 201 is fixed at the fulcrum 21 of the bracket on the right side of the head of the bed, and the tension and pressure sensor 202 is fixed on the The fulcrum 22 of the right bracket in the bed, the tension and pressure sensor 203 is fixed at the fulcrum 23 of the right bracket at the end of the bed, the tension and pressure sensor 204 is fixed at the fulcrum 24 of the left bracket at the end of the bed, and the tension and pressure sensor 205 is fixed on the left side of the bed The fulcrum 25 places of support, tension and pressure sensor 206 are fixed on the fulcrum 26 places of bedside left side bracket, and tension and pressure sensor 201, tension and pressure sensor 202, tension and pressure sensor 203, tension and pressure sensor 204, tension and pressure sensor 205 and tension and pressure Sensors 206 are in the same horizontal plane;

The suspension bed follows the existing mainstream suspension bed structure, and adds a tension-pressure sensor 202 in the middle of the bed body and a tension-pressure sensor 205 in the middle of the bed body. With the addition of tension and pressure sensors in the middle of the bed body, the signal of the middle buttocks, which occupies the main weight of the human body, is obtained, and the weighing data is more comprehensive and accurate.

2. As shown in Figure 2, the analog signal processing of the tension and pressure sensor 201 is based on the 24-bit A/D converter HX711 chip, and the power supply is connected to pin 1 and pin 16 of HX711; the base of triode Q1 is connected to pin 2 of HX711 , The emitter of Q1 is connected to one end of capacitor C1, and the other end of C1 is connected to the ground; the collector of Q1, pin 1 of pull-pressure sensor 201, one end of R1, and one end of C2 are connected to pin 3 of HX711; the other end of R1 and one end of R2 Connect to pin 4 of HX711; the other end of R2, the other end of C2, and one end of C3 are connected to pin 5 of HX711 and grounded; the other end of C3 is connected to pin 6 of HX711; one end of C4 and one end of R3 are connected to pin 7 of HX711, and the other end of R3 One end is connected to pin 3 of tension and pressure sensor 201; one end of R4 and the other end of C4 are connected to pin 8 of HX711, and the other end of R4 is connected to pin 4 of tension and pressure sensor 201; terminal DI201 is connected to pin 12 of HX711, and connected to the main control The unit ATmega128 pin 60; the terminal DO201 is connected to the HX711 pin 11, which is correspondingly connected to the main control unit ATmega128 pin 36. For the convenience of description, the other sensors are DI202, DI203, DI204, DI205, DI206 at the input end of the main control unit; DO202, DO203, DO204, DO205, DO206 at the output end, also adopt 24-bit A/D converter HX711 chip, peripheral circuit It is similar to the tension and pressure sensor 201.

3. As shown in Figure 3, the main control _{module 600 uses} the _{ATmega128 chip} as the core. ₂₀₆ ; ATmega128 pins 36, 37, 38, 39, 40, 41 are respectively connected to terminals DO ₂₀₁ , DO ₂₀₂ , DO ₂₀₃ , DO ₂₀₄ , DO ₂₀₅ , DO ₂₀₆ ; the main control module 600 is connected to the monitoring center via the communication module 700 .

4. As shown in Figure 4 and Figure 5, the tension and pressure sensor transmits the original weight data to the MCU, and adopts the suspended bed weighing analysis method based on spline wavelet denoising, including the following steps:

(1) collecting the weighing signal of the suspended bed;

(2) Store the weighing signal of the suspended bed;

(3) extracting the suspended bed weighing signal after denoising the original suspended bed weighing signal;

(4) Extract the weighing signal of the suspended bed at t minutes and t+15 minutes, and send the difference to the MCU for processing.

Described step (3) comprises the following steps:

(3-1) Carry out wavelet decomposition to the original suspended bed weighing signal with the number of layers as 4 layers to obtain wavelet high frequency layer and wavelet low frequency layer;

(3-2) In the second wavelet low-frequency layer, the general threshold is used to filter the original suspended bed weighing signal:

For the signal point S to be processed, select the domain range of k steps;

Create k patterns with point S as the reference point, calculate the arithmetic mean value of the absolute value of the data within the range of each pattern, select the maximum average value as the characteristic value of point S, and replace the original point S with the characteristic value of point S amplitude;

Compare the eigenvalue of point S after replacement with the general threshold, when the eigenvalue of point S is greater than the general threshold, all the signal points retain the original amplitude; when the eigenvalue of point S is less than or equal to the general threshold, zero the signal point ;

k is a natural number, and the maximum value of k is half of the signal pulse width;

The formula for calculating the general threshold σ is:

σ is the noise standard deviation, n is the length of the signal;

The arithmetic mean calculation formula is:

(3-3) Clear the wavelet high-frequency layer to zero, and filter out high-frequency noise and 50hz power frequency noise;

(3-4) Reconstruct to obtain the extracted original suspended bed weighing signal, which is used as the input signal of the original suspended bed weighing signal in the next step.

5. As shown in Fig. 6 and Fig. 7, an application method of using the weighing data of the medical suspension bed weighing system to assist clinical infusion, comprising the following steps:

1) Turn on the power supply of the suspended bed, check the operation records of the expert system of the suspended bed, the weighing system will display the weight of the unsuspended state in real time, including the weight of the upper bed body and granular material, turn on the fan system, and the weighing system will display the weight of the suspended state in real time, In this state, after the weighing system is cleared, the patient is placed on the suspension bed, and the weighing system displays the weight of the patient, part of the infusion tube and the gauze bound. Let this time point be t ₀ and the weight be G ₀ ; t ₀ +Δt (the general clinical setting of Δt is 15 minutes), and the weight increases to G ₀ +ΔG (the clinical general setting of ΔG is 500 grams);

2) The weighing system reads G ₀ , and sets Δt and ΔG values;

3) Judge whether ΔG is positive or negative;

3-1) Judging that ΔG is positive;

3-1-1) Increase infusion, yes, the green light is on, return to 3); no, enter 3-1-2;

3-1-2) Increase nasal feeding, yes, the green light is on, return to 3); no, enter 3-1-3;

3-1-3) eat, yes, the green light is on, return to 3); no, enter 3-1-4;

3-1-4) water in, yes, the green light is on, return to 3);

3-2) When it is judged that ΔG is negative;

3-2-1) The wound evaporates, yes, alarm, red light is on, enter 4); no, return to 3);

Wound oozing blood, yes, alarm, red light on, enter 4); no, return to 3);

Wound exudate, yes, alarm, red light on, enter 4); no, return to 3);

Vomiting, yes, alarm, red light on, enter 4); no, return 3);

Stool, yes, alarm, red light on, enter 4); no, return to 3);

Urinate, yes, alarm, red light on, enter 4); no, return to 3);

Sweating, yes, alarm, red light on, enter 4); no, return to 3);

Tracheal evaporation, yes, alarm, red light on, enter 4); no, return to 3);

VSD drainage, yes, alarm, red light on, enter 4); no, return to 3);

Dialysis, yes, alarm, red light on, enter 4); no, return 3);

4) Confirmed by the medical staff, the alarm is valid, and the fluid is replenished; return to 3).

Claims (5)

1. a kind of medical suspension bed weighing system, which is characterized in that system is by bed base unit (100), tension-compression sensor branch Frame unit (200), silicon sand support unit (300), silicon sand storage warehouse (400), silica gel press strip (500), main control module (600) and logical Believe module (700) composition；Tension-compression sensor carrier unit (200) include every group of 2 tension-compression sensors, three groups totally 6 tension and compression pass The weight data collection point of sensor；Silicon sand storage warehouse (400) sets up isolation silicon sand and the filter list that directly contacts of patient, filter it is single by Silica gel press strip (500) is fixed；

Tension-compression sensor carrier unit (200) further includes 6 tension-compression sensors, model YP-L1/200Kg, and fixed sensor Bracket；6 tension-compression sensors make axial symmetry distribution using the length axis of bed as symmetry axis；Tension-compression sensor one (201) is drawn Pressure sensor two (202), tension-compression sensor three (203) are separately fixed at the fulcrum one (21) of bracket on the right side of the head of a bed, right side in bed At the fulcrum two (22) of bracket, the fulcrum three (23) of tailstock right side bracket, tension-compression sensor four (204), tension-compression sensor five (205), tension-compression sensor six (206) is similar, and 6 tension-compression sensors are located on same level mounting surface；Tension-compression sensor two (202) it is located among bed body with tension-compression sensor five (205).

2. the medical suspension bed weighing system of one kind according to claim 1, which is characterized in that the tension-compression sensor (201) using 24 A/D converter HX711 chips as core, power supply is connected analog signal processing with HX711 foot 1, foot 16；Three poles Pipe Q1 base stage is connected with HX711 foot 2, Q1 emitter and capacitor C₁One end is connected, C₁The other end be connected to the ground；Q₁Collector, drawing Pressure sensor (201) foot 1, R₁One end, C₂One end be connected with HX711 foot 3；R₁The other end, R₂One end and HX711 foot 4 It is connected；R₂The other end, C₂The other end, C₃One end be connected and be grounded with HX711 foot 5；C₃The other end and 6 phase of HX711 foot Even；C₄One end, R₃One end is connected with HX711 foot 7, R₃The other end be connected with tension-compression sensor (201) foot 3；R₄One end, C₄'s The other end is connected with HX711 foot 8, R₄The other end be connected with tension-compression sensor (201) foot 4；Terminal DI₂₀₁With 12 phase of HX711 foot Even, corresponding to access main control unit ATmega128 foot 60；Terminal DO₂₀₁It is connected with HX711 foot 11, accordingly accesses main control unit ATmega128 foot 36；Remaining sensor is DI in main control unit input terminal₂₀₂、DI₂₀₃、DI₂₀₄、DI₂₀₅、DI₂₀₆；Output end is DO₂₀₂、DO₂₀₃、DO₂₀₄、DO₂₀₅、DO₂₀₆, also use 24 A/D converter HX711 chips, peripheral circuit and tension-compression sensor (201) similar.

3. the medical suspension bed weighing system of one kind according to claim 2, which is characterized in that the main control module (600) using ATmega128 chip as core, ATmega128 foot 60,59,58,57,56,55 respectively with terminal DI₂₀₁、DI₂₀₂、 DI₂₀₃、DI₂₀₄、DI₂₀₅、DI₂₀₆It is connected；ATmega128 foot 36,37,38,39,40,41 respectively with terminal DO₂₀₁、DO₂₀₂、DO₂₀₃、 DO₂₀₄、DO₂₀₅、DO₂₀₆It is connected；Main control module (600) is connected through communication module (700) with monitoring center.

4. a kind of weighing method using medical suspension bed weighing system as described in claim 1, which is characterized in that described The weight data of acquisition is passed to MCU by tension-compression sensor, using the suspension bed weighing analytic approach denoised based on spline wavelets, including Following steps:

(1) suspension bed weighing-up wave is acquired；

(2) suspension bed weighing-up wave is stored；

(3) suspension bed weighing data is extracted after the weighing data denoising acquired；

(4) t minutes and t+15 minutes moment suspension bed weighing-up wave are extracted, difference send MCU to handle；

The step (3) the following steps are included:

(3-1) obtains small echo high frequency layer and wavelet low frequency to suspension bed weighing-up wave is acquired with the number of plies as 4 layers of progress wavelet decomposition Layer；

(3-2) filters out acquisition suspension bed weighing-up wave using generic threshold value in the 2nd layer of wavelet low frequency layer:

To signaling point S to be processed, the territory of k step-length is selected；

K mode processed is put on the basis of S point, calculates separately the arithmetic average of data absolute value in the territory of each mode Value selects maximum average value therein as S point feature value, with the acquisition amplitude of S point feature value substitution S point；

S point feature value after substitution is compared with generic threshold value, when S point feature value is greater than generic threshold value, signaling point is complete Portion retains acquisition amplitude；When S point feature value is less than or equal to generic threshold value, zero setting is carried out to signaling point；

Wherein, k is natural number, and the maximum value value of k is the half of signal pulsewidth；

The calculation formula of generic threshold value σ are as follows:

σ is noise criteria variance, and n is the length of signal；

Arithmetic mean of instantaneous value calculation formula are as follows:

(3-3) directly resets small echo high frequency layer, filters out to high-frequency noise and 50hz industrial frequency noise；

(3-4) reconstructs the original suspension bed weighing-up wave extracted, the input as next step original suspension bed weighing-up wave Signal.

5. a kind of method of the weighing data adjuvant clinical fluid infusion using medical suspension bed weighing system as described in claim 1, It is characterized by comprising the following steps:

1) suspension bed power supply is connected, the log of suspension bed expert system, the non-suspended state of weighing system real-time display are verified Weight, including upper bed body, particulate material weight open blower fan system, the weight of weighing system real-time display suspended state, the shape After weighing system is reset under state, patient is put on suspension bed, weighing system shows patient, infusion segment leather hose and tied up Gauze weight, if the time point is t₀, weight G₀；To t after Δ t₀+ Δ t, weight increase to G₀+ΔG；

2) weighing system reads G₀, set Δ t and Δ G value, Δ t=15 minutes, Δ G=500g；

3) judge that Δ G is positive and negative；

3-1) when Δ G is timing；

3-1-1) judge whether it is infusion to increase, if it is, 3) green light, returns；It is no, into 3-1-2；

Nasal feeding increase 3-1-2) is judged whether it is, if it is, 3) green light, returns；It is no, into 3-1-3；

Feed 3-1-3) is judged whether it is, if it is, 3) green light, returns；It is no, into 3-1-4；

3-1-4) judge whether it is into water, if it is, 3) green light, returns；

3-2) when Δ G is negative；

3-2-1) judge whether it is surface of a wound evaporation, if it is, alarm, red light is bright, into 4)；It is no, it returns 3)；

Judge whether it is blood oozing from the wound surface, be, alarms, red light is bright, into 4)；It is no, it returns 3)；

Judge whether it is wound exudate, be, alarms, red light is bright, into 4)；It is no, it returns 3)；

Judge whether it is vomiting, be, alarms, red light is bright, into 4)；It is no, it returns 3)；

Judge whether it is stool, be, alarms, red light is bright, into 4)；It is no, it returns 3)；

Judge whether it is urine, be, alarms, red light is bright, into 4)；It is no, it returns 3)；

Judge whether it is perspiration, be, alarms, red light is bright, into 4)；It is no, it returns 3)；

Judge whether it is autogenous cutting evaporation, be, alarms, red light is bright, into 4)；It is no, it returns 3)；

Judge whether it is VSD drainage, be, alarms, red light is bright, into 4)；It is no, it returns 3)；

Judge whether it is dialysis, be, alarms, red light is bright, into 4)；It is no, it returns 3)；4) medical staff confirms, alarm effectively, is mended Liquid；It returns 3).