CN103675246A - Process control system of blood gas analyzer based on one master and multiple slaves - Google Patents

Abstract

The invention discloses a process control system of a blood gas analyzer based on one master and multiple slaves. The process control system comprises a main board and a sample injecting needle control board, a turnplate control board, a suction pump control board, a printing control board, a keyboard control board and a signal conditioning and converting board which are connected with the main board, wherein the signal conditioning and converting board is connected with an output end of a signal acquiring electrode on a sample tank; the signal conditioning and converting board receives an output signal of the signal acquiring electrode, processes and converts the signals, and sends the signal to the main board; and the main board calculates a PO2 (oxygen partial pressure) value according to the received signal. According to specific subtasks in the system, microcontrollers with different performance are selected as the slaves to manage individual components, and a high-performance microcontroller is selected as a master to manage the multiple slaves so as to form the one-master and multi-slave system, thereby playing the performance of the microcontrollers, improving the performance and the flexibility of the blood gas analyzer and reducing the cost.

Description

A kind of based on much more main from blood gas analyzer process control system

Technical field

The invention belongs to electronic measurement and control field, particularly a kind of based on much more main from blood gas analyzer process control system.

Background technology

Blood gas analyzer is the medical supply for blood testing, can not only detect the content of gas and the variations of blood pH and index of correlation such as oxygen in patient blood, carbon dioxide, the content that can also reflect fast potassium in blood, sodium, calcium, for detecting favourable guarantee be provided fast and accurately in Rescuing Critical Patients.

Development along with computer technology, computer technology is widely used in blood gas analysis field, make modern blood gas analyzer have super data processing, maintenance, storage and expert diagnosis function, blood gas analyzer is just towards portable, non-maintaining, easy-operating future development.

At present, generally adopt the microcomputer such as PC104 design blood gas analyzer, such instrument can make full use of the performance of computing machine, but exist, malfunction, cost are high, the defect of poor reliability; Also there are the microcontrollers such as 89C51, the MSP430 of employing to design, owing to adopting the one-of-a-kind system of single microcontroller, although can greatly reduce costs, improve the dirigibility of operation, the defect that exists system performance to reduce.

Summary of the invention

The technical matters existing in order to solve above-mentioned background technology, the present invention be intended to propose a kind of based on main many from blood gas analyzer process control system, thereby solve the problem that existing blood gas analyzer performance, dirigibility and cost can not be taken into account.

In order to realize above-mentioned technical purpose, technical scheme of the present invention is:

A kind of based on much more main from blood gas analyzer process control system, the sample introduction needle control panel that comprises mainboard and be attached thereto respectively, rotating disk control panel, suction pump control panel, printing control panel, Keyboard Control plate and signal condition and change-over panel, described signal condition and change-over panel are connected with the output terminal of electrode signal acquisition on sales kit (SK), signal condition and change-over panel receive the output signal of electrode signal acquisition, and give mainboard after this signal is processed and changed, mainboard goes out PO according to the calculated signals receiving ₂value.

Wherein, above-mentioned sample introduction needle control panel, rotating disk control panel and suction pump control panel pass through I ²c interface is connected with mainboard, prints control panel and is connected with mainboard by SPI interface, and Keyboard Control plate is connected with mainboard by I/O mouth with change-over panel with signal condition, and an I/O mouth of Keyboard Control plate is connected with the external interrupt input pin of mainboard.

Wherein, above-mentioned signal condition and change-over panel also comprise 4 tunnel enlargement factors and are respectively 1,2,4,8 amplifying circuit and a multi-channel a/d converter, the input end of described No. 4 amplifying circuits connects sales kit (SK) output signal, the output terminal of No. 4 amplifying circuits is four input ends of connecting multi-channel A/D converter respectively, and four output terminals of corresponding multi-channel a/d converter connect mainboard; Mainboard calculates respectively the PO of four passages ₂the slope of value, then calculates average gradient, then calculates PO according to average gradient ₂value.

Wherein, Keyboard Control plate is given mainboard by key assignments after keyboard obtains effective button, and mainboard adopts the special interruption processing method processing capacity key of revising return address, realizes the transfer of sophisticated functions key, the switching of completion status.

Wherein, mainboard adopts C8051F360 microcontroller, and sample pin control panel, rotating disk control panel, suction pump control panel and printing control panel adopt respectively 4 C8051F912 microcontrollers, Keyboard Control plate to adopt C8051F012 microcontroller.

The beneficial effect that adopts technique scheme to bring is:

(1) master that the present invention adopts is many from structure, and a complicated task is divided into several relatively simple subtask parallel processings, has improved dirigibility and the real-time of system;

(2) the present invention adopts a plurality of amplifiers to PO ₂the millivolt signal of electrode output amplifies, and selects as the case may be different amounts to calculate its value, has improved measuring accuracy;

(3) the present invention adopts the special interruption processing method of revising return address, realizes the transfer of sophisticated functions key, and the switching of completion status has improved fault-tolerance and dirigibility that system operates.

Accompanying drawing explanation

Fig. 1 is structured flowchart of the present invention.

Fig. 2 is state transition graph of the present invention.

Fig. 3 is keyboard interrupt processing flow chart of the present invention.

Embodiment

Below with reference to accompanying drawing, technical scheme of the present invention is elaborated.

Structured flowchart of the present invention as shown in Figure 1, the sample introduction needle control panel that comprises mainboard and be attached thereto respectively, rotating disk control panel, suction pump control panel, printing control panel, Keyboard Control plate and signal condition and change-over panel, described signal condition and change-over panel are connected with the output terminal of electrode signal acquisition on sales kit (SK), signal condition and change-over panel receive the output signal of electrode signal acquisition, and give mainboard after this signal is processed and changed, mainboard goes out PO according to the calculated signals receiving ₂value.

In the present embodiment, relatively single, simple because printing is controlled, sample introduction needle is controlled, rotating disk is controlled, these 4 functions of modules are controlled in suction pump, therefore select respectively the C8051F912 microcontroller of a slice high-performance, low price; The I/O line that Keyboard Control need to be used is more, selects the C8051F012 microcontroller that internal resource is relatively many to complete keyboard detection.Mainboard completes most work, needs jumbo program storage and data-carrier store, selects the high performance C8051F360 microcontroller of a slice to bear, and consists of main many from system these 6 microcontrollers.C8051F912 microcontroller in sample introduction needle control panel, rotating disk control panel, suction pump control panel carries out communication with the C8051F360 microcontroller of I2C serial mode and mainboard, realizes data transmission; In Keyboard Control plate, C8051F012 microcontroller is with the C8051F360 microcontroller transmission key assignments of parallel mode and mainboard, and C8051F012 wherein I/O line is connected to the external interrupt input pin of C8051F360, and C8051F360 processes keyboard with interrupt mode; C8051F912 microcontroller in printing control panel carries out communication with the C8051F360 microcontroller of SPI serial mode and mainboard, realizes data transmission, and the concrete C8051F912 microcontroller of controlling by printing in control panel of printing completes.Sampling output electrode output millivolt signal on sales kit (SK), this signal is given mainboard after the signal amplification in signal condition and change-over panel, A/D conversion.

The present invention adopts multichannel method when calculating oxygen level value.When collection signal, employing 4 tunnel enlargement factors are respectively 1,2,4,8 amplifying circuit, adopt the relatively large passage of enlargement factor, to improve the acquisition precision of signal for little sampled signal.Calculate the PO of each passage ₂the slope of value, then calculates

Average gradient, then collect signal value according to average gradient with while measuring, apply different formula and calculate PO ₂value.Concrete computing method are as follows:

1) point calibration gathers millivolt value a ₃₁, a ₃₂, a ₃₄, a ₃₈

By the millivolt value mv collecting ₃, mv ₄, mv ₅, mv ₆directly be assigned to some corrected values,

a ₃₁=mv ₃；

a ₃₂=mv ₄；

a ₃₄=mv ₅；

a ₃₈ ⁼mv ₆；

Wherein, a ₃₁: some timing PO ₂millivolt value when G=1;

A ₃₂: some timing PO ₂millivolt value when G=2;

A ₃₄: some timing PO ₂millivolt value when G=4;

A ₃₈: some timing PO ₂millivolt value when G=8;

G: the enlargement factor of operational amplifier.

2) two point calibrations gather millivolt value ba ₃₁, b ₃₂, b ₃₄, b ₃₈

By the millivolt value mv collecting ₃, mv ₄, mv ₅, mv ₆, consider the factors such as temperature, by following formula, count two point calibration millivolt values:

$b_{31}={\mathrm{mv}}_3-\frac{142.6-{\mathrm{<figure-callout\; id="2"\; label="PO"\; filenames="131211213304.png"\; state="\{\{state\}\}">PO</figure-callout>}}_2\mathrm{II}}{M_{31}}$

$b_{32}={\mathrm{mv}}_4-\frac{142.6-{\mathrm{<figure-callout\; id="2"\; label="PO"\; filenames="131211213304.png"\; state="\{\{state\}\}">PO</figure-callout>}}_2\mathrm{II}}{M_{32}}$

$b_{34}={\mathrm{mv}}_5-\frac{142.6-{\mathrm{<figure-callout\; id="2"\; label="PO"\; filenames="131211213304.png"\; state="\{\{state\}\}">PO</figure-callout>}}_2\mathrm{II}}{M_{34}}$

$b_{38}={\mathrm{mv}}_6-\frac{142.6-{\mathrm{<figure-callout\; id="2"\; label="PO"\; filenames="131211213304.png"\; state="\{\{state\}\}">PO</figure-callout>}}_2\mathrm{II}}{M_{38}}$

Wherein, b ₃₁: PO during two point calibrations ₂millivolt value when G=1;

B ₃₂: PO during two point calibrations ₂millivolt value when G=2;

B ₃₄: PO during two point calibrations ₂millivolt value when G=4;

B ₃₈: PO during two point calibrations ₂millivolt value when G=8;

M ₃₁: PO ₂slope when G=1, initial value is made as 60;

M ₃₂: PO ₂slope when G=2, initial value is made as 60;

M ₃₄: PO ₂slope when G=4, initial value is made as 60;

M ₃₈: PO ₂slope when G=8, initial value is made as 60;

PO ₂iI:PO ₂the oxygen content of two point calibration titers, initial value is made as 0.

3) measure

According to a point calibration and two point calibration values, calculate the slope of each passage:

$M_{31}=\frac{{\mathrm{PO}}_{2}I-{\mathrm{<figure-callout\; id="2"\; label="PO"\; filenames="131211213304.png"\; state="\{\{state\}\}">PO</figure-callout>}}_2\mathrm{II}}{a_{31}-b_{31}}$

$M_{32}=\frac{{\mathrm{PO}}_{2}I-{\mathrm{<figure-callout\; id="2"\; label="PO"\; filenames="131211213304.png"\; state="\{\{state\}\}">PO</figure-callout>}}_2\mathrm{II}}{a_{32}-b_{32}}$

$M_{34}=\frac{{\mathrm{PO}}_{2}I-{\mathrm{<figure-callout\; id="2"\; label="PO"\; filenames="131211213304.png"\; state="\{\{state\}\}">PO</figure-callout>}}_2\mathrm{II}}{a_{34}-b_{34}}$

$M_{38}=\frac{{\mathrm{PO}}_{2}I-{\mathrm{<figure-callout\; id="2"\; label="PO"\; filenames="131211213304.png"\; state="\{\{state\}\}">PO</figure-callout>}}_2\mathrm{II}}{a_{38}-b_{38}}$

Calculate average gradient

${\stackrel{\&OverBar;}{M}}_3=(M_{31}+M_{31}+M_{31}+M_{31})/4$

According to average gradient

and mv ₅, mv ₆the scope of value, calculates PO ₂

If ${\stackrel{\&OverBar;}{M}}_3<0.2$ $\begin{array}{cc}{\mathrm{mv}}_6<4000& {\mathrm{<figure-callout\; id="2"\; label="PO"\; filenames="131211213304.png"\; state="\{\{state\}\}">PO</figure-callout>}}_2=({\mathrm{mv}}_6-b_{38}){\stackrel{\&OverBar;}{M}}_3+{\mathrm{<figure-callout\; id="2"\; label="PO"\; filenames="131211213304.png"\; state="\{\{state\}\}">PO</figure-callout>}}_{2\mathrm{II}}\end{array}$

$\begin{array}{cc}{\mathrm{mv}}_6<4000& {\mathrm{<figure-callout\; id="2"\; label="PO"\; filenames="131211213304.png"\; state="\{\{state\}\}">PO</figure-callout>}}_2=({\mathrm{mv}}_4-b_{32}){\stackrel{\&OverBar;}{M}}_3+{\mathrm{<figure-callout\; id="2"\; label="PO"\; filenames="131211213304.png"\; state="\{\{state\}\}">PO</figure-callout>}}_{2\mathrm{II}}\end{array}$

If ${\stackrel{\&OverBar;}{M}}_3\&GreaterEqual;0.2$ $\begin{array}{cc}{\mathrm{mv}}_5<4000& {\mathrm{<figure-callout\; id="2"\; label="PO"\; filenames="131211213304.png"\; state="\{\{state\}\}">PO</figure-callout>}}_2=({\mathrm{mv}}_5-b_{34}){\stackrel{\&OverBar;}{M}}_3+{\mathrm{<figure-callout\; id="2"\; label="PO"\; filenames="131211213304.png"\; state="\{\{state\}\}">PO</figure-callout>}}_{2\mathrm{II}}\end{array}$

$\begin{array}{cc}{\mathrm{mv}}_5<4000& {\mathrm{<figure-callout\; id="2"\; label="PO"\; filenames="131211213304.png"\; state="\{\{state\}\}">PO</figure-callout>}}_2=({\mathrm{mv}}_3-b_{31}){\stackrel{\&OverBar;}{M}}_3+{\mathrm{<figure-callout\; id="2"\; label="PO"\; filenames="131211213304.png"\; state="\{\{state\}\}">PO</figure-callout>}}_{2\mathrm{II}}\end{array}$

Wherein, PO ₂i: PO ₂the oxygen content of some calibration standard liquid, initial value is made as 20.

State transition graph of the present invention as shown in Figure 2, system of the present invention mainly contains preparation, ready a, point calibration, two point calibrations and measures 5 states and forms, and the function that wherein a point calibration and two point calibrations are carried out is very complicated.Instrument enters readiness after start, enters two point calibration states by button or after 2 hours, after two point calibration states finish, enters ready state.Under ready state, just can measure.

Because the fluidic component of instrument is more, execution time is grown (as two point calibration states need a few minutes to dozens of minutes), if Design of Monitor adopts conventional keyboard scan--the monitor mode of execute key function, when carrying out these function keys, can not interrupt, even maloperation, also must wait this function key to be finished, this is that user institute is unacceptable.The present invention adopts special interrupt method when design watchdog routine, has realized the transfer of program in interruption; Can revise easily order.

Figure 3 shows that keyboard interrupt processing flow chart of the present invention, this has no progeny main plate response keyboard interrupt outward, first keep the scene intact, then read I/O mouth and obtain key assignments, then judge whether it is special function keys, numerical key and non-special function keys in this way, because this two generic key is simple, just in interrupt service routine, process, then interrupt returning; Special function keys in this way, restoring scene, ejects interrupt return address and abandons from stack top, then by the entry address pop down of special function keys handling procedure, then interrupts returning; Special function keys handling procedure completes in master routine.

Above embodiment only, for explanation technological thought of the present invention, can not limit protection scope of the present invention with this, every technological thought proposing according to the present invention, and any change of doing on technical scheme basis, within all falling into protection scope of the present invention.

Claims (5)

1. One kind based on much more main from blood gas analyzer process control system, it is characterized in that: the sample introduction needle control panel that comprises mainboard and be attached thereto respectively, rotating disk control panel, suction pump control panel, printing control panel, Keyboard Control plate and signal condition and change-over panel, described signal condition and change-over panel are connected with the output terminal of electrode signal acquisition on sales kit (SK), signal condition and change-over panel receive the output signal of electrode signal acquisition, and give mainboard after this signal is processed and changed, mainboard goes out PO according to the calculated signals receiving ₂value.
2. According to described in claim 1 a kind of based on much more main from blood gas analyzer process control system, it is characterized in that: described sample introduction needle control panel, rotating disk control panel and suction pump control panel pass through I ²c interface is connected with mainboard, prints control panel and is connected with mainboard by SPI interface, and Keyboard Control plate is connected with mainboard by I/O mouth with change-over panel with signal condition, and an I/O mouth of Keyboard Control plate is connected with the external interrupt input pin of mainboard.
3. According to described in claim 1 a kind of based on much more main from blood gas analyzer process control system, it is characterized in that: described signal condition and change-over panel also comprise 4 tunnel enlargement factors and be respectively 1,2,4,8 amplifying circuit and a multi-channel a/d converter, the input end of described No. 4 amplifying circuits connects sales kit (SK) output signal, the output terminal of No. 4 amplifying circuits is four input ends of connecting multi-channel A/D converter respectively, and four output terminals of corresponding multi-channel a/d converter connect mainboard; Mainboard calculates respectively the PO of four passages ₂the slope of value, then calculates average gradient, according to average gradient, calculates PO ₂value.
4. According to described in claim 1 a kind of based on much more main from blood gas analyzer process control system, it is characterized in that: Keyboard Control plate is given mainboard by key assignments after keyboard obtains effective button, mainboard adopts the interruption processing method processing capacity key of revising return address, the transfer of practical function key, the switching of completion status.
5. According to described in claim 1 a kind of based on much more main from blood gas analyzer process control system, it is characterized in that: described mainboard adopts C8051F360 microcontroller, sample pin control panel, rotating disk control panel, suction pump control panel and printing control panel adopt respectively 4 C8051F912 microcontrollers, Keyboard Control plate to adopt C8051F012 microcontroller.

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