CN100493632C - Weighing balancing system for blood purification - Google Patents
Weighing balancing system for blood purification Download PDFInfo
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- CN100493632C CN100493632C CNB2006100950654A CN200610095065A CN100493632C CN 100493632 C CN100493632 C CN 100493632C CN B2006100950654 A CNB2006100950654 A CN B2006100950654A CN 200610095065 A CN200610095065 A CN 200610095065A CN 100493632 C CN100493632 C CN 100493632C
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- 239000008280 blood Substances 0.000 title claims abstract description 21
- 210000004369 blood Anatomy 0.000 title claims abstract description 21
- 238000000746 purification Methods 0.000 title claims abstract description 11
- 238000005303 weighing Methods 0.000 title claims description 24
- 239000007788 liquid Substances 0.000 claims abstract description 223
- 239000002699 waste material Substances 0.000 claims abstract description 95
- 238000006073 displacement reaction Methods 0.000 claims description 151
- 238000006243 chemical reaction Methods 0.000 claims description 18
- 239000012530 fluid Substances 0.000 claims description 13
- 238000002360 preparation method Methods 0.000 claims description 6
- 230000018044 dehydration Effects 0.000 claims description 4
- 238000006297 dehydration reaction Methods 0.000 claims description 4
- 101100156949 Arabidopsis thaliana XRN4 gene Proteins 0.000 claims description 3
- 101100215777 Schizosaccharomyces pombe (strain 972 / ATCC 24843) ain1 gene Proteins 0.000 claims description 3
- 238000005304 joining Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 abstract description 4
- 238000009825 accumulation Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 230000004907 flux Effects 0.000 abstract 3
- 238000000108 ultra-filtration Methods 0.000 description 11
- 230000001276 controlling effect Effects 0.000 description 8
- 230000001186 cumulative effect Effects 0.000 description 6
- 239000000385 dialysis solution Substances 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 244000144992 flock Species 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000002560 therapeutic procedure Methods 0.000 description 3
- 230000007306 turnover Effects 0.000 description 3
- 230000017531 blood circulation Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 210000001124 body fluid Anatomy 0.000 description 1
- 239000010839 body fluid Substances 0.000 description 1
- 230000004087 circulation Effects 0.000 description 1
- 238000000502 dialysis Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 229920000554 ionomer Polymers 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000001225 therapeutic effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to a weight balancer used in blood purification, wherein it comprises balance control circuit 4 with output connected to waste pump 5 and exchange liquid pump 6. The input of circuit 4 is connected to the sampling circuit 3 connected to the waste liquid weighting sensor WS1 and exchange liquid weighting sensor WS2. The invention can check the flux, check error, and eliminate its effect on system balance; it uses total flux to calculate, to avoid accumulation error and realize dynamic balance control on liquid flux.
Description
Technical field
Ultrafiltration control system when the present invention relates to the dialysis of a kind of human body, the weighing balancing system for blood purification of displacement liquid and waste liquid flow when relating in particular to a kind of dynamic control blood of human body purification treatment.
Background technology
In blood cleaning equipment, patient's blood flows out the extracorporeal circulation that constitutes via pipeline in the body to be got back in the body, in this blood circulation, mainly comprises bloody path, liquid road and three parts of monitoring system.Outside the intravital blood lead body of patient, enter extracorporeal circuit such as dialyser or filter, pass back into human body, constitute the bloody path system; In the liquid-way system, the dialysis solution of standard ionomer concentration enters processes such as dialyser and dialyzer membrane offside blood samples of patients generation disperse, convection current, ultrafiltration, and removes redundant moisture in patient's body with suitable speed.Monitoring system is monitored each parts of blood cleaning equipment, parameter, index etc., by calculating and the relevant execution unit work of control, reaches therapeutic purposes.
As shown in Figure 1: in the therapeutic process, the effect that the intravital blood of patient is drawn by the road by blood pump enters into dialyser, and draws from the other end and to be back to by the road in the body; And the dialysis solution of normal concentration enters from the dialyser side by the road, by realizing disperse, convection current, Ultrafiltration between film in the dialyser and the blood and getting rid of as waste liquid from another side of dialyser side; In order to satisfy the intravital body fluid balance of patient, the pressure and the flow of ultrafiltration control system control dialysis fluid circuit turnover liquid in this process, three's balance, i.e. waste liquid=displacement liquid+dehydrating amount between the dehydrating amount of guaranteeing to enter the waste liquid amount of the intravital displacement liquid measure of patient, eliminating and needing to get rid of in patient's body.Clinically because patient's individual variation, displacement liquid flow velocity in the therapeutic process, rate of water loss, displacement liquid total amount and dehydration total amount all are different, need monitor the variation of each amount constantly and realize the balance of above-mentioned three amounts by regulating the speed of displacement liquid and waste drains pump in the ultrafiltration control system.
Existing ultrafiltration control system mainly adopts following two kinds of methods to realize balance: a kind of is to adopt counter balance pocket or dual pump mode, realizes balance by means of displacement liquid and the isometric turnover of waste liquid; Because no flow monitoring and relevant feedback link if break down or the accumulation of error, will cause balance to be destroyed in the therapeutic process, even malpractice will take place.
Another kind of scheme is to adopt the effusion meter mode, this balance sysmte is provided with balance control circuit (4), this balance control circuit is provided with outfan, connect waste drains pump (5) in the waste liquid loop and the displacement liquid pump in the displacement liquid loop respectively, the input of described balance control circuit is connected with photoelectricity effusion meter or electromagnetic flowmeter respectively, and this is arranged in waste liquid balanced loop and the displacement liquid loop; Detect the flow of dialyser turnover dialysis solution by effusion meter, calculate the ultrafiltration rate, and with design ultrafiltration rate relatively, the re-adjustment dialysate pressure realizes that by the control transmembrane pressure control to the ultrafiltration rate is with final control ultrafiltration volume.It is same because the accumulation of flow detection error easily causes balance to be destroyed.
Traditional ultrafiltration control system can only detect current instantaneous value, and its shortcoming is can't overcome the influence of cumulative errors to system balancing to the detection of flow aggregate-value.
Summary of the invention
The purpose of this invention is to provide a kind of weighing balancing system for blood purification, can detect, detect cumulative errors, eliminate its influence system balancing to the flow aggregate-value.
For achieving the above object, weighing balancing system for blood purification of the present invention, comprise balance control circuit, this balance control circuit is provided with outfan, connect waste drains pump in the waste liquid loop and the displacement liquid pump in the displacement liquid loop respectively, its key is: the input of described balance control circuit is connected with sample circuit, and this sample circuit is provided with two road inputs, is connected with waste liquid weighing unit and displacement liquid weighing unit respectively;
Described waste liquid weighing unit is provided with waste liquid LOAD CELLS WS1, and this LOAD CELLS WS1 upper ends has the waste liquid pallet, is placed with waste fluid container in this waste liquid pallet, and described waste fluid container connects the flow export in described waste liquid loop;
Described displacement liquid weighing unit is provided with displacement liquid LOAD CELLS WS2, and this displacement liquid LOAD CELLS WS2 upper ends has the displacement liquid pallet, is placed with the displacement liquid container in this displacement liquid pallet, and described displacement liquid container connects the inflow entrance in described displacement liquid loop.
Waste liquid LOAD CELLS WS1 and displacement liquid LOAD CELLS WS2 measure the liquid gross mass in waste liquid pallet and the displacement liquid pallet respectively, generate analogue signal, sample circuit is translated into digital signal, and carry signal to balance control circuit, balance control circuit is judged, compare the difference of current total flow and mean flow rate and setting value, dynamically control the rotating speed of waste drains pump and displacement liquid pump, realize balance control waste liquid and displacement liquid flow.
Described sample circuit is A/D conversion chip IC1, and the first via positive input AIN1+ end of this A/D conversion chip IC1, the negative input of first via AIN1-end connect two outfans of described waste liquid LOAD CELLS WS1 respectively; The second tunnel positive input AIN2+ end of described A/D conversion chip IC1, the second tunnel negative input AIN2-end connect two outfans of described displacement liquid LOAD CELLS WS2 respectively;
The chip selection signal of described A/D conversion chip IC1-CS end, clock signal SCLK end, numeral input DIN end, numeral output DOUT end and preparation DRDY end are connected chip selection signal end, clock signal terminal, digital output end, digital input end and the preparation end of described balance control circuit respectively.
The model of LOAD CELLS is L6D-C3D-35kg-0.4B, and its outfan is connected to two difference input channels of sample circuit, and sample circuit is one 16 A/D switching controller AD7705BN.AD7705BN is the high-resolution modulus conversion chip of U.S. AD company, the interface of itself and balance control circuit adopts spi bus, and balance control circuit sends the controlling of sampling order and receives the value of two A/D ALT-CH alternate channels to AD7705 by spi bus-CS, DOUT, DIN, DRDY.The weight of waste fluid container and displacement liquid container is converted into voltage signal by LOAD CELLS WS1 and WS2, and by giving balance control circuit after the AD7705BN A/D conversion.Balance control circuit is 8 8-digit microcontroller P89LPC925 of PHILIPS company, is connected to the spi bus signal pins control of sample circuit and reads the A/D conversion value of waste liquid and displacement liquid weight by the input/output end port on its chip; Also be connected outside parameter setting circuit with the SCL holding wire by SDA, receive pre-flock waste liquid total amount UF_total, pre-flock waste liquid time S0, in advance add displacement liquid total amount SUB_total, add displacement liquid time S0 ' in advance; After predetermined value and actual value were made comparisons, judged, its outfan sent different rotating speed order control waste drains pumps and displacement liquid pump respectively, realizes the total amount dynamic equilibrium of fluid flow.
Described balance control circuit is a microcontroller IC2, and its inside is provided with the displacement liquid apparatus for controlling pump, and this displacement liquid apparatus for controlling pump comprises:
Be used to start the mechanism of displacement liquid pump control;
Be used to read the mechanism of pre-adding displacement liquid total amount SUB_total;
Be used to read the mechanism of pre-adding displacement liquid time S0 ';
Be used to calculate the mechanism of pre-adding displacement liquid flow velocity V0 ';
After the SUB_total that reads sample circuit and external parameter are provided with the S0 ' that circuit presets, calculate V0 '=SUB_total/S0 ',
Be used to read the mechanism of current residual displacement liquid measure UF0;
Be used to calculate current with the mechanism that replaces liquid measure UF1;
After reading the UF0 of sample circuit, calculate UF1=SUB_total-UF0,
Be used to add up the mechanism of the joining day S ' that uses the displacement liquid measure;
Be used to calculate the mechanism of current displacement liquid flow velocity V1;
V1＝UF1/S’，
Be used to judge that described current displacement liquid flow velocity V1 is whether greater than the mechanism of described pre-adding displacement liquid flow velocity V0 ';
Described current displacement liquid flow velocity V1 then exports reduce-speed sign and gives described displacement liquid pump greater than described pre-adding displacement liquid flow velocity V0 ', and returns the described mechanism that is used to read current residual displacement liquid measure UF0;
Described current displacement liquid flow velocity V1 is not more than described pre-adding displacement liquid flow velocity V0 ', judges that then described current displacement liquid flow velocity V1 is whether less than the mechanism of described pre-adding displacement liquid flow velocity V0 ';
Described current displacement liquid flow velocity V1 then exports signal for faster and gives described displacement liquid pump less than described pre-adding displacement liquid flow velocity V0 ', and returns the described mechanism that is used to read current residual displacement liquid measure UF0;
Described current displacement liquid flow velocity V1 equals described pre-adding displacement liquid flow velocity V0 ', returns the described mechanism that is used to read current residual displacement liquid measure UF0.
The inside of described balance control circuit also is provided with the waste drains pump control device, and this waste drains pump control device comprises:
Be used to start the mechanism of waste drains pump control;
Be used to read the mechanism of preliminary dehydration total amount UF_total;
Be used to read the mechanism of preliminary dewatering time S0;
Be used to calculate the mechanism of preliminary dewatering speed V0;
After reading external parameter the UF_total and S0 that circuit presets is set, calculate V0=UF_total/S0;
Be used to read the current mechanism that leaches waste liquid amount UF;
Be used to read current with the mechanism that replaces liquid measure UF1;
Be used to calculate the mechanism of current dehydrating amount U;
Read the UF that sample circuit provides, and behind the UF1 that provides of displacement liquid apparatus for controlling pump, calculating U=UF-UF1;
Be used to add up the mechanism of current dewatering time S;
Be used to calculate the mechanism of current dewatering speed V;
V＝U/S；
Be used to judge that described current dewatering speed V is whether greater than the mechanism of described preliminary dewatering speed V0;
Described current dewatering speed V then exports reduce-speed sign and gives described waste drains pump, and return the described current mechanism that leaches waste liquid amount UF that is used to read greater than described preliminary dewatering speed V0;
Described current dewatering speed V is not more than described preliminary dewatering speed V0, judges that then described current dewatering speed V is whether less than the mechanism of described preliminary dewatering speed V0;
Described current dewatering speed V then exports signal for faster and gives described waste drains pump, and return the described current mechanism that leaches waste liquid amount UF that is used to read less than described preliminary dewatering speed V0;
Described current dewatering speed V equals described preliminary dewatering speed V0, returns the described current mechanism that leaches waste liquid amount UF that is used to read.
Utilize total, overcome cumulative errors, realized dynamic equilibrium control simultaneously fluid flow.
Remarkable result of the present invention is: can detect the flow aggregate-value, detect cumulative errors, eliminate its influence to system balancing, utilize total, overcome cumulative errors, realize the dynamic equilibrium control to fluid flow simultaneously.
Description of drawings
Accompanying drawing 1: the block diagram that is dialysis solution and blood of human body path in the blood cleaning equipment;
Accompanying drawing 2: Weighing balancing system control principle block diagram among the present invention;
Accompanying drawing 3: Weighing balancing system operation principle sketch map among the present invention;
Accompanying drawing 4: Weighing balancing system circuit theory diagrams among the present invention;
Accompanying drawing 5: displacement liquid pump control flow chart among the present invention;
Accompanying drawing 6: waste drains pump control flow chart among the present invention.
The specific embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Shown in accompanying drawing 2, accompanying drawing 3:
A kind of weighing balancing system for blood purification, form by balance control circuit 4, waste drains pump 5, displacement liquid pump 6, sample circuit 3, wherein: balance control circuit 4 is provided with outfan, connect waste drains pump 5 in the waste liquid loop and the displacement liquid pump 6 in the displacement liquid loop respectively, the input of described balance control circuit 4 is connected with sample circuit 3, this sample circuit 3 is provided with two road inputs, is connected with waste liquid weighing unit 1 and displacement liquid weighing unit 2 respectively; Described waste liquid weighing unit 1 is provided with waste liquid LOAD CELLS WS1, and this LOAD CELLS WS1 upper ends has waste liquid pallet 1a, is placed with waste fluid container 1b in this waste liquid pallet 1a, and described waste fluid container 1b connects the flow export in described waste liquid loop;
Described displacement liquid weighing unit 2 is provided with displacement liquid LOAD CELLS WS2, this displacement liquid LOAD CELLS WS2 upper ends has displacement liquid pallet 2a, be placed with displacement liquid container 2b in this displacement liquid pallet 2a, described displacement liquid container 2b connects the inflow entrance in described displacement liquid loop.
Waste liquid LOAD CELLS WS1 and displacement liquid LOAD CELLS WS2 measure the liquid gross mass in waste liquid pallet 1a and the displacement liquid pallet 2a respectively, generate analogue signal, sample circuit 3 is translated into digital signal, and carry signal to balance control circuit 4, balance control circuit 4 is judged, compare the difference of current total flow and mean flow rate and setting value, dynamically control the rotating speed of waste drains pump 5 and displacement liquid pump 6, realize balance control waste liquid and displacement liquid flow.
As shown in Figure 4: described sample circuit 3 is A/D conversion chip IC1, and the first via positive input AIN1+ end of this A/D conversion chip IC1, the negative input of first via AIN1-end connect two outfans of described waste liquid LOAD CELLS WS1 respectively; The second tunnel positive input AIN2+ end of described A/D conversion chip IC1, the second tunnel negative input AIN2-end connect two outfans of described displacement liquid LOAD CELLS WS2 respectively;
The chip selection signal of described A/D conversion chip IC1-CS end, clock signal SCLK end, numeral input DIN end, numeral output DOUT end and preparation DRDY end are connected chip selection signal end, clock signal terminal, digital output end, digital input end and the preparation end of described balance control circuit 4 respectively.
The model of LOAD CELLS is L6D-C3D-35kg-0.4B, and its sampling outfan is connected to two difference input channels of sample circuit 3, and sample circuit 3 is one 16 A/D switching controller AD7705BN.AD7705BN is the high-resolution modulus conversion chip of U.S. AD company, the interface of itself and balance control circuit 4 adopts spi bus, and balance control circuit 4 sends the controlling of sampling order and receives the value of two A/D ALT-CH alternate channels to AD7705 by spi bus-CS, DOUT, DIN, DRDY.The weight of waste fluid container and displacement liquid container is converted into voltage signal by LOAD CELLS WS1 and WS2, and by giving balance control circuit 4 after the AD7705BN A/D conversion.Balance control circuit 4 is 8 8-digit microcontroller P89LPC925 of PHILIPS company, and the value of the voltage signal of WS1 and WS2 last reflection waste liquid and displacement liquid weight through the A/D conversion controlled and read to the spi bus signal pins that is connected to sample circuit 3 by the input/output end port on its chip; Also be connected to outside parameter setting circuit by SDA and SCL holding wire, receive pre-flock waste liquid total amount UF_total, pre-flock waste liquid time S0, in advance add displacement liquid total amount SUB_total, add displacement liquid time S0 ' in advance; After predetermined value and actual value were made comparisons, judged, the outfan on the control circuit 4 sent different rotating speed control command control waste drains pump 5 and displacement liquid pump 6 respectively, realizes the total amount dynamic equilibrium of fluid flow.
The rotating speed control command is by two control modules, realizes that respectively this control module is a prior art to the rotating speed control of waste drains pump 5 and displacement liquid pump 6.
As shown in Figure 5: described balance control circuit 4 is microcontroller IC2, and its inside is provided with the displacement liquid apparatus for controlling pump, and this displacement liquid apparatus for controlling pump comprises:
Be used to start the mechanism of displacement liquid pump control;
Be used to read the mechanism of pre-adding displacement liquid total amount SUB_total;
Be used to read the mechanism of pre-adding displacement liquid time S0 ';
Be used to calculate the mechanism of pre-adding displacement liquid flow velocity V0 ';
After the SUB_total that reads sample circuit 3 and external parameter are provided with the S0 ' that circuit 1 presets, calculate V0 '=SUB_total/S0 ',
Be used to read the mechanism of current residual displacement liquid measure UF0;
Be used to calculate current with the mechanism that replaces liquid measure UF1;
Behind the UF0 that reads sample circuit 3, calculate UF1=SUB_total-UF0,
Be used to add up the mechanism of the joining day S ' that uses the displacement liquid measure;
Be used to calculate the mechanism of current displacement liquid flow velocity V1;
V1＝UF1/S’，
Be used to judge that described current displacement liquid flow velocity V1 is whether greater than the mechanism of described pre-adding displacement liquid flow velocity V0 ';
Described current displacement liquid flow velocity V1 then exports reduce-speed sign and gives described displacement liquid pump 6 greater than described pre-adding displacement liquid flow velocity V0 ', and returns the described mechanism that is used to read current residual displacement liquid measure UF0;
Described current displacement liquid flow velocity V1 is not more than described pre-adding displacement liquid flow velocity V0 ', judges that then described current displacement liquid flow velocity V1 is whether less than the mechanism of described pre-adding displacement liquid flow velocity V0 ';
Described current displacement liquid flow velocity V1 then exports signal for faster and gives described displacement liquid pump 6 less than described pre-adding displacement liquid flow velocity V0 ', and returns the described mechanism that is used to read current residual displacement liquid measure UF0;
Described current displacement liquid flow velocity V1 equals described pre-adding displacement liquid flow velocity V0 ', returns the described mechanism that is used to read current residual displacement liquid measure UF0.
As shown in Figure 6: the inside of described balance control circuit 4 also is provided with the waste drains pump control device, and this waste drains pump control device comprises:
Be used to start the mechanism of waste drains pump control;
Be used to read the mechanism of preliminary dehydration total amount UF_total;
Be used to read the mechanism of preliminary dewatering time S0;
Be used to calculate the mechanism of preliminary dewatering speed V0;
After reading external parameter the UF_total and S0 that circuit presets is set, calculate V0=UF_total/S0;
Be used to read the current mechanism that leaches waste liquid amount UF;
Be used to read current with the mechanism that replaces liquid measure UF1;
Be used to calculate the mechanism of current dehydrating amount U;
Read the UF that sample circuit provides, and behind the UF1 that provides of displacement liquid apparatus for controlling pump, calculating U=UF-UF1;
Be used to add up the mechanism of current dewatering time S;
Be used to calculate the mechanism of current dewatering speed V;
V＝U/S；
Be used to judge that described current dewatering speed V is whether greater than the mechanism of described preliminary dewatering speed V0;
Described current dewatering speed V then exports reduce-speed sign and gives described waste drains pump 5, and return the described current mechanism that leaches waste liquid amount UF that is used to read greater than described preliminary dewatering speed V0;
Described current dewatering speed V is not more than described preliminary dewatering speed V0, judges that then described current dewatering speed V is whether less than the mechanism of described preliminary dewatering speed V0;
Described current dewatering speed V then exports signal for faster and gives described waste drains pump 5, and return the described current mechanism that leaches waste liquid amount UF that is used to read less than described preliminary dewatering speed V0;
Described current dewatering speed V equals described preliminary dewatering speed V0, returns the described current mechanism that leaches waste liquid amount UF that is used to read.
Utilize total, overcome cumulative errors, realized dynamic equilibrium control simultaneously fluid flow.
Its operation principle is as follows:
The present invention is installed in the liquid-way system of blood cleaning equipment, waste liquid LOAD CELLS WS1 and displacement liquid LOAD CELLS WS2 measure the liquid gross mass in waste liquid pallet 1a and the displacement liquid pallet 2a respectively, generate analogue signal, sample circuit 3 is translated into digital signal, and carry signal to balance control circuit 4, balance control circuit 4 is judged, compare the difference of current total flow and mean flow rate and setting value, dynamically the rotating speed of control waste drains pump 5 and displacement liquid pump 6 is realized the balance control to dehydrating amount and displacement liquid flow.
Claims (3)
1, a kind of weighing balancing system for blood purification, comprise balance control circuit (4), this balance control circuit (4) is provided with outfan, connect waste drains pump (5) in the waste liquid loop and the displacement liquid pump (6) in the displacement liquid loop respectively, it is characterized in that: the input of described balance control circuit (4) is connected with sample circuit (3), this sample circuit (3) is provided with two road inputs, is connected with waste liquid weighing unit (1) and displacement liquid weighing unit (2) respectively;
Described waste liquid weighing unit (1) is provided with waste liquid LOAD CELLS WS1, this LOAD CELLS WS1 upper ends has waste liquid pallet (1a), be placed with waste fluid container (1b) in this waste liquid pallet (1a), described waste fluid container (1b) connects the flow export in described waste liquid loop;
Described displacement liquid weighing unit (2) is provided with displacement liquid LOAD CELLS WS2, this displacement liquid LOAD CELLS WS2 upper ends has displacement liquid pallet (2a), be placed with displacement liquid container (2b) in this displacement liquid pallet (2a), described displacement liquid container (2b) connects the inflow entrance in described displacement liquid loop;
The inside of described balance control circuit (4) also is provided with the displacement liquid apparatus for controlling pump, and this displacement liquid apparatus for controlling pump comprises:
Be used to start the mechanism of displacement liquid pump control;
Be used to read the mechanism of pre-adding displacement liquid total amount SUB_total;
Be used to read the mechanism of pre-adding displacement liquid time S0 ';
Be used to calculate the mechanism of pre-adding displacement liquid flow velocity V0 ';
Be used to read the mechanism of current residual displacement liquid measure UF0;
Be used to calculate current with the mechanism that replaces liquid measure UF1;
Be used to add up the mechanism of the joining day S ' that uses the displacement liquid measure;
Be used to calculate the mechanism of current displacement liquid flow velocity V1;
Be used to judge that described current displacement liquid flow velocity V1 is whether greater than the mechanism of described pre-adding displacement liquid flow velocity V0 ';
Described current displacement liquid flow velocity V1 then exports reduce-speed sign and gives described displacement liquid pump (6) greater than described pre-adding displacement liquid flow velocity V0 ', and returns the described mechanism that is used to read current residual displacement liquid measure UF0;
Described current displacement liquid flow velocity V1 is not more than described pre-adding displacement liquid flow velocity V0 ', judges that then described current displacement liquid flow velocity V1 is whether less than the mechanism of described pre-adding displacement liquid flow velocity V0 ';
Described current displacement liquid flow velocity V1 then exports signal for faster and gives described displacement liquid pump (6) less than described pre-adding displacement liquid flow velocity V0 ', and returns the described mechanism that is used to read current residual displacement liquid measure UF0;
Described current displacement liquid flow velocity V1 equals described pre-adding displacement liquid flow velocity V0 ', returns the described mechanism that is used to read current residual displacement liquid measure UF0.
2, weighing balancing system for blood purification according to claim 1, it is characterized in that: described sample circuit (3) is A/D conversion chip IC1, and the first via positive input AIN1+ end of this A/D conversion chip IC1, the negative input of first via AIN1-end connect two outfans of described waste liquid LOAD CELLS WS1 respectively; The second tunnel positive input AIN2+ end of described A/D conversion chip IC1, the second tunnel negative input AIN2-end connect two outfans of described displacement liquid LOAD CELLS WS2 respectively;
The chip selection signal of described A/D conversion chip IC1-CS end, clock signal SCLK end, numeral input DIN end, numeral output DOUT end and preparation DRDY end are connected chip selection signal end, clock signal terminal, digital output end, digital input end and the preparation end of described balance control circuit (4) respectively.
3, weighing balancing system for blood purification according to claim 1 is characterized in that:
Described balance control circuit (4) is a microcontroller IC2, and its inside is provided with the waste drains pump control device, and this waste drains pump control device comprises:
Be used to start the mechanism of waste drains pump control;
Be used to read the mechanism of preliminary dehydration total amount UF_total;
Be used to read the mechanism of preliminary dewatering time S0;
Be used to calculate the mechanism of preliminary dewatering speed V0;
Be used to read the current mechanism that leaches waste liquid amount UF;
Be used to read current with the mechanism that replaces liquid measure UF1;
Be used to calculate the mechanism of current dehydrating amount U;
Be used to add up the mechanism of current dewatering time S;
Be used to calculate the mechanism of current dewatering speed V;
Be used to judge that described current dewatering speed V is whether greater than the mechanism of described preliminary dewatering speed V0;
Described current dewatering speed V then exports reduce-speed sign and gives described waste drains pump (5), and return the described current mechanism that leaches waste liquid amount UF that is used to read greater than described preliminary dewatering speed V0;
Described current dewatering speed V is not more than described preliminary dewatering speed V0, judges that then described current dewatering speed V is whether less than the mechanism of described preliminary dewatering speed V0;
Described current dewatering speed V then exports signal for faster and gives described waste drains pump (5), and return the described current mechanism that leaches waste liquid amount UF that is used to read less than described preliminary dewatering speed V0;
Described current dewatering speed V equals described preliminary dewatering speed V0, returns the described current mechanism that leaches waste liquid amount UF that is used to read.
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| CNB2006100950654A CN100493632C (en) | 2006-08-25 | 2006-08-25 | Weighing balancing system for blood purification |
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| CNB2006100950654A CN100493632C (en) | 2006-08-25 | 2006-08-25 | Weighing balancing system for blood purification |
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| CN2009100024895A Division CN101502682B (en) | 2006-08-25 | 2006-08-25 | Mass balance system for purifying blood |
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| CN100493632C true CN100493632C (en) | 2009-06-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101502682B (en) * | 2006-08-25 | 2010-09-01 | 重庆山外山科技有限公司 | Mass balance system for purifying blood |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101269246B (en) * | 2008-05-05 | 2011-10-12 | 重庆山外山科技有限公司 | Continuous blood cleaning equipment with replacement liquid purifier |
| PL2644215T3 (en) * | 2012-03-28 | 2015-04-30 | Gambro Lundia Ab | Apparatus for extracorporeal treatment of blood |
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Also Published As
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| CN1994482A (en) | 2007-07-11 |
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