CN201903525U - Biological sensing test instrument and biological sensing test system - Google Patents

Abstract

The utility model discloses a biological sensing test instrument and a biological sensing test system. The biological sensing test instrument comprises a first operation amplifier, a second operation amplifier, a first reference voltage source, a second reference voltage source, a detecting device, a first port, a second port, a third port and a fourth port, wherein a first input of the first operation amplifier is connected with the first reference voltage source, a second input is connected with the second port, an output of the first operation amplifier is connected with the first port and the detecting device, a first input of the second operation amplifier is connected with the second reference voltage source, a second input is connected with the fourth port, and an output of the second operation amplifier is connected with the third port. The device provided by the utility model can effectively improve the biological sensing measuring accuracy.

Description

A kind of bio-sensing tester and bio-sensing test macro

Technical field

The utility model relates to the bio-sensing field tests, specifically, relates to a kind of bio-sensing tester and bio-sensing test macro.

Background technology

At present, the bio-sensor system that is used for the test signal relevant with biological fluid content of analyte (such as blood-sugar content) comprises the bio-sensing test-strips and uses the test macro of this test-strips.Fig. 1 is a typical bio-sensing test-strips; This bio-sensing test-strips is by thebiological reagent 18 onsubstrate 12, substrate one end, form with theconductive region 14,16 ofbiological reagent 18 conductings.It is poor to apply a constant potential betweentest electrode 14a, 16a, so that the electric signal that the reaction of the measured matter in detection ofbiological reagent 18 and the biological sample is produced.

The shortcoming of the bio-sensing test-strips of this structure is: even constant by the current potential that applies between the sub-14b of electrode tips, the 16b, because all there is dead resistance in any conductive material, throughconductive channel 14c, 16c and the actual potential difference (PD) that puts betweentest electrode 14a, the 16a is not the potential difference (PD) that is applied; And because that the dead resistance of bio-sensing test-strips can not be accomplished is in full accord, so the actual potential difference (PD) that puts betweentest electrode 14a, the 16a can not be accomplished constant.

The utility model content

The main technical problems to be solved in the utility model is, a kind of bio-sensing tester and bio-sensing test macro are provided, and can effectively improve the bio-sensing measuring accuracy.

For solving the problems of the technologies described above, the utility model has adopted following technical scheme:

A kind of bio-sensing tester comprises:

First operational amplifier, second operational amplifier, first reference voltage source, second reference voltage source, detection means, and first port, second port, the 3rd port, the 4th port; First input of described first operational amplifier connects described first reference voltage source, and second input connects described second port, and the output of described first operational amplifier connects described first port, and connects described detection means; First input of described second operational amplifier connects described second reference voltage source, and second input connects described the 4th port, and the output of described second operational amplifier connects described the 3rd port.

In a kind of embodiment of described bio-sensing tester, described bio-sensing tester also comprises resistance, and described resistance is connected between the output and described first port of described first operational amplifier.

In a kind of embodiment of described bio-sensing tester, when the resistance of described resistance is biological sensing testing and more than 10 times of dead resistance of the bio-sensing test-strips that is used of described bio-sensing tester.

In a kind of embodiment of described bio-sensing tester, described first reference voltage source and second reference voltage source are digital to analog converter.

In a kind of embodiment of described bio-sensing tester, described detection means is an analog to digital converter.

In a kind of embodiment of described bio-sensing tester, also comprise microprocessor, have first control output end that links to each other with described first reference voltage source and second control output end that links to each other with described second reference voltage source, set in order to the output potential of controlling described first reference voltage source and described second reference voltage source; Described microprocessor also has the input end that links to each other with described detection means; Described first reference voltage source and second reference voltage source are the digital to analog converter of described microprocessor internal, and described detection means is the analog to digital converter of described microprocessor internal.

The utility model also provides a kind of bio-sensing test macro, comprise the bio-sensing test-strips and cooperate with described bio-sensing test-strips and the bio-sensing tester that carries out the bio-sensing test that described bio-sensing test-strips comprises first test electrode, first conductive channel that is communicated with first test electrode, second conductive channel, second test electrode, the 3rd conductive channel that is communicated with second test electrode, the 4th conductive channel; Described bio-sensing tester comprises first operational amplifier, second operational amplifier, first reference voltage source, second reference voltage source, detection means, and first port, second port, the 3rd port, the 4th port; First input of described first operational amplifier connects described first reference voltage source, and second input connects described second port, and the output of described first operational amplifier connects described first port, and connects described detection means; First input of described second operational amplifier connects described second reference voltage source, and second input connects described the 4th port, and the output of described second operational amplifier connects described the 3rd port; During use, first port and the coupling of described first conductive channel, second port and the coupling of described second conductive channel, the 3rd port and the coupling of described the 3rd conductive channel, the 4th port and the coupling of described the 4th conductive channel.

In a kind of embodiment of described bio-sensing test macro, described bio-sensing tester also comprises resistance, and described resistance is connected between the output and described first port of described first operational amplifier.

In a kind of embodiment of described bio-sensing test macro, the resistance of described resistance is more than 10 times of dead resistance of described bio-sensing test-strips.

In a kind of embodiment of described bio-sensing test macro, described first reference voltage source and second reference voltage source are digital to analog converter; Described detection means is an analog to digital converter.

When carrying out the bio-sensing test, biological reagent and biological analyte reaction generate little electric current, but because operational amplifier has very large input impedance, and little electric current can only flow to or flow out the output of first operational amplifier, promptly flow on first conductive channel; There is not electric current to flow and connect on second conductive channel of first operational amplifier second input, that is to say, current potential unanimity on second conductive channel, first test electrode is identical with the current potential of second input of first operational amplifier, the current potential of first test electrode can be set accurately by digital to analog converter D/A334, guarantee that the actual voltage difference that is applied on the bio-sensing test-strips is required voltage difference, make the current potential that the test electrode of bio-sensing test-strips obtains setting, guaranteed the precision of bio-sensing test.

Further, by resistance in series between first conductive channel of the output of first operational amplifier and bio-sensing test-strips, because resistance in series is far longer than dead resistance usually, for example, in described a kind of embodiment, resistance in series is set to be at least more than 10 times of dead resistance, thereby the pressure drop that forms on the dead resistance will significantly reduce, pressure drop will mainly focus on resistance in series, like this during the electric signal of the output detection of biological sensing by first operational amplifier, the influence to electrical signal detection of dead resistance will reduce greatly, thereby reduce the influence of dead resistance to measuring accuracy, further improve the bio-sensing measuring accuracy.

Description of drawings

Fig. 1 is a kind of typical bio-sensing test-strips;

Fig. 2 is the employed bio-sensing test-strips of the utility model embodiment;

Fig. 3 is the bio-sensing tester of a kind of embodiment of the utility model;

Fig. 4 is the bio-sensing tester of the another kind of embodiment of the utility model.

Embodiment

In conjunction with the accompanying drawings the utility model is described in further detail below by embodiment.

The utility model relates to a kind of bio-sensing tester and bio-sensing test macro.Described bio-sensing tester and bio-sensing test macro are used for test and biological fluid content of analyte---such as the relevant signal of blood-sugar content, also can be used for measuring and disturbing---such as the signal of hematocrit in the blood sugar and temperature correlation, so that analyze the content of analyte signal.This bio-sensing tester and bio-sensing test macro that the utility model embodiment is proposed, (it is poor to be generally constant potential with required potential difference (PD) for energy, but it is poor to be not limited to constant potential) be applied to the test electrode of reaction zone, and compensate the dead resistance of bio-sensing test-strips conductive channel simultaneously, thereby reduce of the influence of the dead resistance of bio-sensing test-strips as much as possible measuring accuracy.

Referring to Fig. 2, employed bio-sensing test-strips comprises among the utility model embodiment:substrate 12 generally can be the thick film of 350uM, as PET or PVC etc.; Working electrode 226,214 reaches electrode 216,224, can be made by technologies such as printing or plating; Wherein, label 226 is as the general designation oflabel 226a, 226b, 226c; Label 214 is as the general designation oflabel 214a, 214b, 214c; Label 216 is as the general designation oflabel 216a, 216b, 216c; Label 224 is as the general designation oflabel 224a, 224b, 224c.The implication of label a, b, c is as follows:

Test electrode a---the electrode part in the reaction zone: 226a, 214a, 216a, 224a;

Contact terminal b---the part that is connected with the bio-sensing tester: 226b, 214b, 216b, 224b;

Bus c---connect the part of test electrode and contact terminal: 226c, 214c, 216c, 224c;

The bca of above-mentioned each electrode or acb constitute each conductive channel of bio-sensing test-strips, wherein, 226b, 226c, 226a constitute first conductive channel, 214b, 214c, 214a constitute second conductive channel, 216b, 216c, 216a constitute the 3rd conductive channel, and 224b, 224c, 224a constitute the 4th conductive channel.Thefirst test electrode 226a, 214a are communicated with first conductive channel, second conductive channel; Thesecond test electrode 216a, 224a are communicated with the 3rd conductive channel, the 4th conductive channel.

Biological reagent 18 is attached totest electrode 216a, the 214a of bio-sensing test-strips one end by printing or spraying, technologies such as some liquid etc.When adding a potential difference (PD) fortest electrode 216a, 214a,biological reagent 18 reacts with the biological analyte of required mensuration content, can measure the content of described biological analyte reaction.

The bio-sensing test-strips has a reaction zone 20.Reaction zone 20 comprisestest electrode 214a, 216a, and test electrode directly contacts with the sample of the biological analyte of required mensuration content.In whole electro-chemical test system, the bio-sensing test-strips is inserted in the tester that uses this test-strips,test electrode 214a, 216a in thereaction zone 20 and Fig. 3 or bio-sensing tester shown in Figure 4 are connected, the bio-sensing tester provides a potential difference (PD) fortest electrode 214a, 216a, and (it is poor to be generally constant potential, but it is poor to be not limited to constant potential), and measure the reaction of electrochemical sensor to this potential difference (PD).This reaction and content of analyte are proportional.

The bio-sensing test-strips has contact region 22.Contact region 22 comprisescontact terminal 226b, 214b, 216b,224b.Contact region 22 usually but may not be certain, be positioned at away from the end on the bio-sensing test-strips ofreaction zone 20.

The bio-sensing tester connects the bio-sensing test-strips bycontact terminal 226b, 214b, 216b, 224b.Bus 226c, 214c, 216c, 224c connectcontact terminal 226b, 214b, 216b, 224b andtest electrode 226a, 214a, 216a, 224a respectively.

Fig. 3 is the circuit diagram of the bio-sensing tester of embodiment one,test electrode 214a, the 216a that the test circuit of bio-sensing tester is comprised for thereaction zone 20 of bio-sensing test-strips applies required potential difference (PD), and (it is poor to be generally constant potential, but it is poor to be not limited to constant potential), and compensate the dead resistance of the conductive channel of bio-sensing test-strips simultaneously, thereby reduce the influence of dead resistance as much as possible measuring accuracy.

When the bio-sensing test-strips is inserted the bio-sensing tester, first port of bio-sensing tester is connected to thecontact terminal 226b of bio-sensing test-strips, second port is connected to thecontact terminal 214b of bio-sensing test-strips, the 3rd port is connected to thecontact terminal 216b of bio-sensing test-strips, and the 4th port is connected to thecontact terminal 224b of bio-sensing test-strips.

Secondoperational amplifier 320 of the test circuit of bio-sensing tester is formed voltage follower with electrode 216,224.First input of secondoperational amplifier 320 connects second reference voltage source (in the example of Fig. 3, be digital to analog converter D/A336), second input connects the 4th port that is used to connect bio-sensing test-strips contact terminal 224b, and output connects the 3rd port that is used to connect bio-sensing test-strips contact terminal 216b.Second reference voltage source, i.e. D/A336 output required voltage is supplied with described voltage follower, thus thetest electrode 216a that follows path that is positioned at voltage follower keeps exporting same voltage with D/A522.

First input of firstoperational amplifier 310 of the test circuit of bio-sensing tester connects first reference voltage source (in the example of Fig. 3, be digital to analog converter D/A334), second input of firstoperational amplifier 310 connects second port that is used to connect bio-sensing test-strips contact terminal 214b, and the output of firstoperational amplifier 310 connects first port that is used to connect bio-sensing test-strips contact terminal 226b.In the inside of tester circuit, the output of firstoperational amplifier 310 is also connected to a detection means (in the example of Fig. 3, promptly modulus converter A/D 332).D/A334 output required voltage is supplied with first input of firstoperational amplifier 310, and the current potential of second input of firstoperational amplifier 310 equates with the current potential of its first input.The biological reagent ofreaction zone 20 and biological analyte reaction, generate little electric current, but because operational amplifier has very large input impedance, little electric current can only flow to or flow out the output of firstoperational amplifier 310, promptly flows on first conductive channel that 226b, 226c, 226a constitute; There is not electric current to flow and connect on 214a, the 214c of firstoperational amplifier 310 second input, second conductive channel that 214b constitutes, that is to say, current potential unanimity on 214a, 214c, the 214b conductive channel, promptlytest electrode 214a is identical with the current potential of second input of first operational amplifier 310.Test electrode 226a is identical with the current potential of first input of firstoperational amplifier 310, is the current potential that digital to analog converter D/A 334 is exported, and the current potential oftest electrode 214a is the current potential ofelectrode 226a, can set by digital to analog converter D/A334.

Therefore can pass through digital to analog converter D/A334,336 betweentest electrode 214a, the 216a and set required potential difference (PD).The setting of potential difference (PD), test result are come out mainly by microprocessor processes, microprocessor has first control output end that links to each other with first reference voltage source (digital to analog converter D/A334) and second control output end that links to each other with second reference voltage source (digital to analog converter D/A336), sets in order to the output potential of controlling first reference voltage source and second reference voltage source; Microprocessor also has the input end that links to each other with detection means (modulus converter A/D 332); Digital to analog converter D/A334,336, digital to analog converter D/A336 etc. all can be arranged on the inside of microprocessor, promptly first reference voltage source and second reference voltage source are the digital to analog converter of microprocessor internal, and detection means is the analog to digital converter of microprocessor internal.

There are dead resistance inconductive channel 226b, 226c, 226a, and because technological reason, this dead resistance of bio-sensing test-strips can not be accomplished unanimity.Referring to Fig. 4, can be between the output of first operational amplifier of bio-sensing tester and first port resistance inseries 440, and make the dead resistance of the resistance of this resistance inseries 440 much larger than (for example more than 10 times)conductive channel 226b, 226c, 226a, be the pressure drop that onresistance 440, produces of little electric current much larger than the pressure drop that on dead resistance, produces, thereby can control the measuring error that dead resistance is brought.

Above content be in conjunction with concrete embodiment to further describing that the utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.

Claims (10)

1. a bio-sensing tester is characterized in that, comprising:

First operational amplifier, second operational amplifier, first reference voltage source, second reference voltage source, detection means, and first port, second port, the 3rd port, the 4th port; First input of described first operational amplifier connects described first reference voltage source, and second input connects described second port, and the output of described first operational amplifier connects described first port, and connects described detection means; First input of described second operational amplifier connects described second reference voltage source, and second input connects described the 4th port, and the output of described second operational amplifier connects described the 3rd port.

2. bio-sensing tester as claimed in claim 1 is characterized in that, described bio-sensing tester also comprises resistance, and described resistance is connected between the output and described first port of described first operational amplifier.

3. bio-sensing tester as claimed in claim 2 is characterized in that, when the resistance of described resistance is biological sensing testing and more than 10 times of dead resistance of the bio-sensing test-strips that is used of described bio-sensing tester.

4. bio-sensing tester as claimed in claim 1 is characterized in that, described first reference voltage source and second reference voltage source are digital to analog converter.

5. bio-sensing tester as claimed in claim 1 is characterized in that, described detection means is an analog to digital converter.

6. as the arbitrary described bio-sensing tester of claim 1-5, it is characterized in that, also comprise microprocessor, have first control output end that links to each other with described first reference voltage source and second control output end that links to each other with described second reference voltage source, set in order to the output potential of controlling described first reference voltage source and described second reference voltage source; Described microprocessor also has the input end that links to each other with described detection means, and described first reference voltage source and second reference voltage source are the digital to analog converter of described microprocessor internal, and described detection means is the analog to digital converter of described microprocessor internal.

7. bio-sensing test macro, it is characterized in that, comprise the bio-sensing test-strips and cooperate with described bio-sensing test-strips and the bio-sensing tester that carries out the bio-sensing test that described bio-sensing test-strips comprises first test electrode, first conductive channel that is communicated with first test electrode, second conductive channel, second test electrode, the 3rd conductive channel that is communicated with second test electrode, the 4th conductive channel; Described bio-sensing tester comprises first operational amplifier, second operational amplifier, first reference voltage source, second reference voltage source, detection means, and first port, second port, the 3rd port, the 4th port; First input of described first operational amplifier connects described first reference voltage source, and second input connects described second port, and the output of described first operational amplifier connects described first port, and connects described detection means; First input of described second operational amplifier connects described second reference voltage source, and second input connects described the 4th port, and the output of described second operational amplifier connects described the 3rd port; During use, first port and the coupling of described first conductive channel, second port and the coupling of described second conductive channel, the 3rd port and the coupling of described the 3rd conductive channel, the 4th port and the coupling of described the 4th conductive channel.

8. bio-sensing test macro as claimed in claim 7 is characterized in that, described bio-sensing tester also comprises resistance, and described resistance is connected between the output and described first port of described first operational amplifier.

9. bio-sensing test macro as claimed in claim 8 is characterized in that, the resistance of described resistance is more than 10 times of dead resistance of described bio-sensing test-strips.

10. as the arbitrary described bio-sensing test macro of claim 7-9, it is characterized in that described first reference voltage source and second reference voltage source are digital to analog converter; Described detection means is an analog to digital converter.

Images