CN203324219U - Biosensor - Google Patents
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- CN203324219U CN203324219U CN2013201483043U CN201320148304U CN203324219U CN 203324219 U CN203324219 U CN 203324219U CN 2013201483043 U CN2013201483043 U CN 2013201483043U CN 201320148304 U CN201320148304 U CN 201320148304U CN 203324219 U CN203324219 U CN 203324219U
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Abstract
The utility model provides a biosensor. The biosensor comprises an insulating bottom plate, an electrode system, a reaction reagent and an insulating layer, wherein the insulating layer covers part of the electrode system, a closed region without the insulating layer but defined by the insulating layer is formed in the position of the reaction reagent and is provided with a closed boundary without a sharp corner, and the reaction reagent covers the closed region and does not exceed the closed boundary. The biosensor also comprises auxiliary diffusion electrodes. By virtue of the closed boundary without the sharp corner and the auxiliary diffusion electrodes, an edge effect of the reagent is alleviated, the reagent can be uniformly distributed in the corresponding regions of the electrodes, the dose of the reaction reagent is effectively controlled, and the product cost is reduced.
Description
Technical field
The utility model relates to the biology sensor for detection of physical signs content.
Background technology
In recent years, from utilizing at first clinical labororatory's pattern detection to only need realizing fast detecting at one's side in doctor's office or patient, great variety has occurred in the medical health care detection field.With the disposable biological sensor of electrode system, be often used in the middle of fast detecting.Diabetic's the daily glucose detection of take is example, the patient only need utilize disposable biological sensor to be detected at home now, just can obtain tested patient glucose level at that time, help the patient understand in time the health of self and adjust accordingly the dietary structure of oneself, or allow the doctor according to the data of daily monitoring, dosage be adjusted to hospital.Therefore in the daily monitoring of disease, the accuracy of this kind disposable biology sensor seems particularly important.
This class can be for the detection of various materials with the biology sensor of electrode system, and according to the difference of analyte, the reaction reagent added on electrode system is also different.For example measure the biology sensor of Glucose in Blood by Cyclic, at first be that the reaction reagents such as glucose oxidase are added on working electrode, when blood sample drops is added in working electrode, due to the enzyme reaction agent dissolves in blood, glucose in blood will with working electrode on oxidase react, electron accepter reduces thereupon.After enzyme reaction finishes, by the electron accepter electrochemical oxidation of reduction, obtain the content of glucose in sample by calculating the oxidation current value.
The basic structure of this class biology sensor comprises: an insulating base; Have electrode system on this insulating base, this electrode system at least comprises working electrode and to electrode; Contain and produce according to measured matter content in sample the reaction reagent that can survey signal and cover at least one working electrode; A detection sample channel formed by separation layer, this sample channel is positioned at working electrode and on electrode, and while detecting sample through this conversation, the reaction reagent interior with passage reacts and produces the signal that can be detected.Instrument, according to this signal, draws testing result.
In passage, the amount of the reaction reagent of participation and detection example reaction has a great impact the testing result tool.Therefore, how accurately the amount of the reaction reagent of control and participate in reaction is a large technical barrier of this area.The area that the amount that participates in the reaction reagent of reaction equals sample channel is multiplied by the thickness of reaction reagent layer, therefore, accurately controlling the size of the sample channel between the different product of same batch of production and control reaction reagent thickness homogeneity is mainly to need the problem solved.
The precision that accurately size of Quality control passage can be by improving mould and select suitable material to solve, but the homogeneity of controlling reaction reagent thickness is a relatively scabrous technical matters.
As shown in Fig. 1 of U.S. Pat 7655119, add an insulcrete 16 with rectangle diffusion of reagents control zone 18 on electrode, it is partly the active region of electrode that described rectangle diffusion of reagents control zone exposes the electrode that need to add reaction reagent, reaction reagent drip in this control zone 18 and and electrode contact, and the part of other non-participation reactions of electrode is due to the covering that cover plate 16 is arranged, and do not have above reagent is added on, reaction reagent just is limited at the needed position of working electrode like this.When we find to add reaction reagent by this way, often there will be added reaction reagent can not cover the phenomenon of whole rectangular region fully, for example reagent can not arrive four drift angle ends in rectangle diffusion control district.This also just means the product of same batch of production, and the area that its reaction reagent covers is unequal.In the situation that the reaction reagent volume dripped is equal, will there be deviation in the thickness of the reaction reagent of the product of same batch of production, and therefore, the reaction reagent amount that participates in reaction also can be unequal.So utilizing these products to be detected resulting testing result will be inaccurate.While adopting these class methods to add reaction reagent on electrode, even more serious bad phenomenon occurs sometimes, reaction reagent not only can not cover completely whole rectangular region, the dual-side of rectangle diffusion of reagents control zone that even had part reagent to overflow.
While with biology sensor, sample being tested, usually only need very little sample size, for example only need the amount of liquid of 0.5 microlitre to 1 microlitre.Biology sensor also is made into very little structure, and the reaction reagent covered on electrode is just less.In the research that improves test accuracy, people do not notice that reaction reagent spread condition on the electrode of small size so presents diversity, and these diversity are on the impact of test result.People often make a search to improve the detection accuracy of biology sensor from the structure of electrode, material selection, test methodology and the tester of electrode.And we notice when adopting rectangle diffusion of reagents control zone to control the distribution of reaction reagent on electrode, the area of rectangle control zone is very tiny, reagent can be because surface tension effects forms a semisphere droplet-like in the groove of rectangle control zone, cause the reagent on electrode in uneven thickness, forming the edge of thin result, particularly coating area around thick middle has inhomogeneous or reaction reagent to concentrate on the phenomenon in the centre in electrode activity zone.And the existence of semisphere droplet-like edge surface tension force has stoped further diffusion towards periphery of reagent, thereby occur between reagent edge and four drift angles reserving reagent blank district phenomenon, four drift angle places can not be filled up by reaction reagent.It is full that the biology sensor of producing by this way there will be the electrode activity zone on the sensor had evenly to be covered by reaction reagent, and the drift angle in some electrode activities zone does not have the became uneven one of reaction reagent or covering.Some position of electrode does not have reaction reagent can cause sample segment not participate in reaction, and the variation that the reaction reagent became uneven covered on electrode makes reaction rate occur does not for a moment meet predefined mode, and these all can cause the inaccurate of testing result.
And for example in Chinese 200480023924.8 patents, do not adopt insulcrete to hide the method for adding reagent, but directly reaction reagent is coated on electrode by the die slot dispense tip, create continuous reagent strip.Because the reagent area of coating is very large, even comprised the part that does not need to add reaction reagent.This can cause the waste of reagent, increases cost of products.On the other hand, due to the surface tension effects of insulativity base plate, make reagent diffusion thereon can be subject to certain resistance, this resistance has hindered the even diffusion of reaction reagent on electrode system, makes reaction reagent not arrive predefined position.
Because the biology sensor size of the concentration of glucose in blood for detection of the mankind is very little, testing mechanism is very complicated, and the blood sample amount adopted is usually between the 0.3-1.0 microlitre, therefore current technical merit can only obtain relatively accurate testing result.U.S. food and drug surveilance office (FDA) to the legal requirements of the biology sensor of the concentration of glucose in blood for detection of the mankind are: as long as the positive and negative deviation of 95% above testing result and standard glucose concentration is in 20%, it is qualified that product is considered to.As can be seen here, the technical difficulty that lifting detects concentration of glucose accuracy in human blood with biology sensor is very high.
Statisticss demonstrations in 2011 of IDF (IDF), global diabetic has increased to 3.66 hundred million people at present, estimates will reach nearly 600,000,000 people in 20 years.In China, the morbidity rate of diabetes was turned over nearly twice at nearly 10 years.In 2010, the Chinese Adult diabetes prevalence was 9.7%, and the diabetic has reached people more than 100,000,000 4 thousand.Because radix is huge, even the test accuracy rate only improves 1%, so, in the whole world, will reduce by the mistaken diagnosis of 3,600,000 person-times, the whole world will have 3,600,000 people therefrom to benefit, and this will bring sizable economic benefit and social benefit.
The medical expert reminds, the important component part that diabetes are Non Communicable Diseases (NCD), if rationally do not monitored and being treated, diabetic's long-term hyperglycemia state can cause the infringement of whole body multisystem, cause various acute and chronic complication, such as angiocardiopathy, diabetic nephropathy, the change of diabetes nerve venereal disease, DRP etc.Therefore, the accuracy of test is extremely important, and it can effectively guarantee that patient and doctor find change of illness state early, revises in time dosage and eating habit, prevents that the patient from, for a long time in hyperglycemia state, avoiding the generation of fearful complication.Whether reaction reagent correctly distributes and is one but to be ignored by people be to guarantee whole test result one of key factor accurately on electrode.
The utility model content
In order to overcome above-mentioned shortcoming, one of the purpose of this utility model is to provide a kind of have reaction reagent accurately location and the few biology sensor of consumption, this biology sensor, comprise the insulativity base plate and be positioned at the electrode system on the insulativity base plate, include reaction reagent and the insulation course that can react with the detection sample on electrode system, this insulation course cover part electrode system, but the position at the reaction reagent place forms a closed region that there is no insulation course, on the electrode part that reaction reagent is positioned at this closed region divides, the described closed region surrounded by insulation course has a closed boundary of not having a wedge angle, reaction reagent covers this closed region, and do not exceed this closed boundary.
As further improvement of the utility model, described closed boundary be shaped as relative oval or four rectangles that drift angle is circular arc of circle, ellipse, two.
As further improvement of the utility model, reaction reagent is filled full described closed region just, and the area of reaction reagent overlay area equates with the area of closed region.
As further improvement of the utility model, the thickness of described insulation course is the 1-50 micron.
As further improvement of the utility model, the thickness of described insulation course is the 3-30 micron.
As further improvement of the utility model, the material of described insulation course is hydrophobic material.
As further improvement of the utility model, the both sides of the electrode part covered by reaction reagent at electrode system also respectively comprise an auxiliary diffusion electrode, and described auxiliary diffusion electrode partly is arranged side by side with the electrode covered by reaction reagent.
Two of the purpose of this utility model is to provide a kind of method of manufacturing biology sensor, comprising:
1) form electrode system on the insulativity base plate;
2) form an insulation course on electrode system, this insulation course cover part electrode system, and form a ，Gai closed region, closed region that there is no an insulation course and there is a closed boundary of not having a wedge angle;
3) add reaction reagent to described closed region, make reaction reagent cover this closed region, but do not exceed the closed boundary of this closed region;
4) dry described reaction reagent.
As further improvement of the utility model, the closed boundary of described closed region be circular, oval or four drift angles to be circular arc square.
As further improvement of the utility model, the thickness of described insulation course is the 3-30 micron.
Three of the purpose of this utility model is to provide a kind of biology sensor, comprise the insulativity base plate and be positioned at the electrode system on the insulativity base plate, include the reaction reagent that can react with the detection sample on electrode system, it is characterized in that, described electrode system comprise for detection of functional electrode and for controlling the auxiliary diffusion electrode of reaction reagent diffusion, functional electrode is between auxiliary diffusion electrode.
As further improvement of the utility model, comprise at least two auxiliary diffusion electrodes.
As further improvement of the utility model, described at least two auxiliary diffusion electrodes lay respectively at the outside of functional electrode.
As further improvement of the utility model, the distance between auxiliary diffusion electrode and functional electrode, just in time make the front end that is added on the reaction reagent on functional electrode can touch this auxiliary diffusion electrode.
As further improvement of the utility model, functional electrode comprises working electrode, to electrode and reference electrode, and these functional electrodes and auxiliary electrode are arranged side by side, and roughly are parallel to each other.
As further improvement of the utility model, described auxiliary electrode is two, lays respectively at the outside of functional electrode.
As further improvement of the utility model, the insulation course that comprises the cover part electrode system, this insulation course forms a closed region that there is no insulation course in the position at reaction reagent place, on the electrode part that reaction reagent is positioned at this closed region divides, the described closed region surrounded by insulation course has a closed boundary of not having a wedge angle, reaction reagent covers this closed region, and does not exceed this closed boundary.
As further improvement of the utility model, described closed boundary be shaped as relative oval or four rectangles that drift angle is circular arc of circle, ellipse, two.
As further improvement of the utility model, the thickness of described insulation course is the 3-30 micron.
The beneficial effects of the utility model are: by a large amount of experiments, show, biology sensor described in the utility model is not had an application of sample pattern of diffusion of reagents control zone of wedge angle owing to adopting, effectively overcome the edge effect of reaction reagent, make reaction reagent can be distributed to equably the respective regions of electrode, thereby can control exactly the homogeneity of the reaction reagent thickness of the biology sensor that same batch produces, and then improve the accuracy of testing result.In the production run of biology sensor, the reaction reagent added is filled the full reaction reagent identical with its shape and is added district, has avoided reaction reagent to add the phenomenon that four, district drift angle is not filled up by reaction reagent.Manufacture method described in the utility model is simple on the other hand, without control the consumption of reaction reagent through complicated step.The electrode system of biology sensor of the present utility model has at least two auxiliary diffusion electrodes on the one hand again, should assist diffusion electrode can overcome the surface tension effects of insulativity base plate, make the reagent can smooth and easy even diffusion on electrode system, and arrive predefined position.And reaction reagent can not overflow predefined zone yet.
The accompanying drawing explanation
Fig. 1 is the utility model the first biology sensor;
Fig. 2 A-2E is the production stage of the biology sensor shown in Fig. 1;
Fig. 3 is the exploded view of the biology sensor shown in Fig. 1;
Fig. 4 is the electrode microphoto after the biology sensor dropwise reaction reagent shown in Fig. 1;
Fig. 5 is the utility model the second reaction reagent diffusion-controlled layer structural drawing;
Fig. 6 is the electrode microphoto utilized after the structure dropwise reaction reagent of Fig. 5;
Fig. 7 is the biology sensor exploded view with auxiliary diffusion electrode;
Fig. 8 is the electrode microphoto utilized after the structure dropwise reaction reagent of Fig. 7;
Fig. 9 is the third reaction reagent diffusion-controlled layer structural drawing;
Figure 10 is the electrode microphoto utilized after the structure dropwise reaction reagent of Fig. 9;
Figure 11 is the 4th kind of reaction reagent diffusion-controlled layer structural drawing;
Figure 12 is the electrode microphoto utilized after the structure dropwise reaction reagent of Figure 11;
Figure 13 is the exploded view of the biology sensor of prior art;
Figure 14 is the electrode microphoto utilized after the structure dropwise reaction reagent of Figure 13;
Figure 15 is the linear graph that utilizes biosensor assay glucose standard solution of the present utility model;
Figure 16 is the linear graph of the biosensor assay glucose standard solution of prior art.
Figure 17 is that biology sensor is combined the use constitutional diagram with the blood examination instrument.
Figure 18 is the schematic diagram of reaction reagent spread condition in prior art.
Figure 19 is the schematic diagram of reaction reagent spread condition in the utility model.
Embodiment
Below in conjunction with concrete accompanying drawing, the utility model is described in detail.These specific embodiments are only limited the enumerating under the utility model spirit, do not get rid of one of ordinary skill in the art prior art and the utility model in conjunction with and other specific embodiments of producing.
Alternatively say, biology sensor of the present utility model comprises insulativity base plate 1 and is positioned at the electrode system on the insulativity base plate, include reaction reagent and the insulation course 5 that can react with the detection sample on electrode system, these insulation course 5 cover part electrode systems, but forming one in the position at reaction reagent place does not have the 6(Ci closed region, closed region of insulation course to be equal to reaction reagent diffusion control district 6), on the electrode part that reaction reagent is positioned at this closed region 6 divides, the described closed region surrounded by insulation course has a closed boundary of not having a wedge angle, reaction reagent covers this closed region, and do not exceed this closed boundary.The shape of closed boundary can be circular, oval, two relative oval or rectangles that four drift angles are circular arc etc.At one, preferably in scheme, reaction reagent is filled full described closed region just, and the area of reaction reagent overlay area equates with the area of closed region.The thickness of insulation course is the 1-50 micron.The thickness of insulation course is that the 3-30 micron can be better.The material of insulation course is hydrophobic material.As further improvement of the utility model, the both sides of the electrode part covered by reaction reagent at electrode system also respectively comprise an auxiliary diffusion electrode, and described auxiliary diffusion electrode partly is arranged side by side with the electrode covered by reaction reagent.
Above scheme is commonly called parallel capillary application of sample technology.In another embodiment, also can take the scheme of vertical application of sample, that is, the upper cover with well sticks on key-course 5, and the well of upper cover just in time is positioned on the diffusion of reagents control zone and is identical or smaller with the aperture area of this control zone.Also when sample drop is added in well, samples vertical flows and the reagent in control zone contacts and reacts.
Reaction reagent diffusion control district 6 is the holes without wedge angle, and the reaction reagent of interpolation spreads and can arrive the All Ranges that this control zone is set in this control zone.The shape of diffusion of reagents control zone can be the hole with the circular arc limit, shapes such as circle, ellipse, Pear-Shaped.Can also be other shapes that wedge angle do not occur, four quadrilaterals that drift angle is circular arc in the diffusion control district for example.By a large amount of tests, we are surprised to find and utilize diffusion of reagents described in the utility model control zone, can form when reaction reagent is added on electrode and spread reagent layer even, consistency of thickness, and the reagent layer lid has been expired the whole active region of electrode.
Amount of reagent is according to actual needs determined the degree of depth and the size in reaction reagent diffusion control district 6.The degree of depth of diffusion of reagents control zone is the 1-50 micron in one embodiment, and preferably the degree of depth is the 3-30 micron, and the preferred degree of depth is the 5-20 micron.
When upper cover 8 covers described space, manufacture on layer 7, the groove of manufacturing layer 7 with space has formed a path 10 that adds sample.In order to make sample flow channel arriving on electrode system smoothly, upper cover 8 is also with the vent port 11 of application of sample path 10.
Fig. 2 is the method for manufacturing the utility model biology sensor embodiment illustrated in fig. 3.But manufacture method described in the utility model is not limited to step shown in Fig. 2.
As shown in Figure 2 A, provide an insulating base 1, and add electrode system on the insulativity base plate, the described electrode system of the present embodiment comprises working electrode 2, to electrode 3 and reference electrode 4.In another embodiment, electrode system comprises working electrode 2, to electrode 3 and reference electrode 4, also comprises auxiliary diffusion electrode 12 as shown in Figure 7.
Insulating base 1 can be selected but be not limited to following various material: the insulativity materials such as carbon, polystyrene, polycarbonate, Corvic and polyester.In an embodiment, base plate can be made with polyethylene terephthalate (PET).Described base plate thickness is the 3-10 mil, and for example the PET band of 5 mils (long measure, 1 mil equals mil, 0.0254 millimeter for mil, mil) can provide suitable support, and the PET tunica albuginea of 14 mils is applicable equally.Certainly, much different thickness also can play good effect in the utility model.Insulating base is that electrode and electrode cable provide support.
Alternatively say, the method for manufacture biology sensor of the present utility model, comprise the following steps:
1) form electrode system on the insulativity base plate;
2) form an insulation course on electrode system, this insulation course cover part electrode system, and form a ，Gai closed region, closed region that there is no an insulation course and there is a closed boundary of not having a wedge angle;
3) add reaction reagent to described closed region, make reaction reagent cover this closed region, but do not exceed the closed boundary of this closed region;
4) dry described reaction reagent.
Can adopt variety of way that electrode is placed on insulating base 1.These modes include but not limited to that serigraphy, ink jet printing, bonding agent are bonding, lithography and laser carved method etc.Silver or silver chloride, graphite, palladium, gold, platinum, iridium stainless steel and other suitable conductive materials can be as the materials of electrode.Electrode also can be formed by these combinations of materials, and is not single composition.For example, with the electrode of reaction reagent contact jaw, adopt graphite, the rear end of this electrode and detecting instrument contact jaw adopt ag material.
As shown in Fig. 2 B, when electrode system after dry forming, is placed on reaction reagent diffusion-controlled layer 5 on electrode system on insulating base 1, and the diffusion of reagents control zone 6 on this key-course just in time is positioned on the active region of electrode system.Reaction reagent 200 is added in diffusion of reagents control zone 6, and evenly diffusion on the electrode activity zone, and the actual reagent area covered on electrode is identical with preliminary election setting area.
Reaction reagent diffusion-controlled layer 5 is placed on electrode system by bonding, heat-sealing, ultra-sonic welded or the mode such as roll.Reaction reagent diffusion-controlled layer 5 is selected from hydrophobic material, for example is selected from the polystyrene of insulation, hydrophobic inks or the glue of insulation.Described glue can be double faced adhesive tape, single face glue or transfer adhesive etc.In one embodiment, reaction reagent diffusion-controlled layer 5 is a double faced adhesive tape material, and its one side can stick to key-course on the base plate with electrode system, and another side and upper cover 8 are bonding or bonding with space manufacture layer 7.
Whether contain one or more in reaction reagent exists for detection of analyte in fluid sample or the chemical composition of its content.For example, the reaction reagent of electrochemica biological sensor comprises oxidoreducing enzyme and electron acceptor, and the two is used for detecting sample and producing the reaction product that a kind of electronic detection system can be surveyed.In the embodiment that detects Glucose in Blood by Cyclic, reaction reagent contains glucose oxidase, chlorination six ammino rutheniums (III), BSA, CaSO4, TritonX-100 and PVP etc.The techniques such as spraying by serigraphy, liquid dropping, scraper for coating and nozzle slot are added on reaction reagent on electrode.
As shown in Figure 2 C, after the reaction reagent drying be added on electrode, layer 7 is manufactured in the space with fluted 9 and be placed on the base plate with electrode system and reaction reagent.At this end with reaction reagent layer, space is manufactured layer and is covered the electrode part do not contacted with sample, and reaction reagent layer is exposed in groove 9.Space is manufactured layer and is not covered the electrode with the relative other end with reaction reagent layer, makes this part exposed electrode to contact with the pin on detecting instrument 300, as shown in figure 17 connected mode.Space is manufactured layer and is placed on electrode system by bonding, heat-sealing, ultra-sonic welded or the mode such as roll.Its material is insulation hydrophobic material, for example material of bonding agent.When the polystyrene of layer employing insulation is manufactured in space, can be in the equal coated with adhesive in the two sides of this layer to stick to diffusion of reagents key-course 5 and upper cover 8.In one embodiment, for making sample, in groove, flow smoothly, can carry out hydrophilic treatment to groove 9, for example, to surperficial coating surface activating agent or the plasma treatment of groove, give the groove surfaces contacted with sample and there is water wettability.
As shown in Figure 2 D, upper cover 8 is placed on to space and manufactures on layer 7, make biology sensor.As shown in Figure 2 E, upper cover 8 makes groove 9 become the path 10 that sample enters biology sensor after covering and being with reeded space manufacture layer upper.Sample enters biology sensor from feeder connection, and utilizes the formed capillarity of groove to enter smoothly and contact with reaction reagent.Upper cover material can be the hydrophobic material of insulation or the material of other character.Upper cover 8 has vent port 11, and described vent port 11 is positioned at groove 9 tops and away from the sample channel inlet end.
Fig. 7 is another kind of biology sensor 100 described in the utility model, comprises insulativity base plate 1, on the insulativity base plate, includes electrode system.Described electrode system comprises working electrode 2, to functional electrodes such as electrode 3 or reference electrodes 4.Also comprise auxiliary diffusion electrode 12 on the insulativity base plate, this auxiliary diffusion electrode can assist to drip the reaction reagent diffusion equably rapidly on electrode on functional electrode.The both sides of adding the electrode system of reaction reagent at needs have auxiliary diffusion electrode.For example, functional electrode is between auxiliary diffusion electrode, and auxiliary diffusion electrode is positioned at the functional electrode outside.Distance between auxiliary diffusion electrode and functional electrode is moderate, and this distance makes the front end that drips the reaction reagent on functional electrode can touch this auxiliary diffusion electrode.
In preferential scheme, auxiliary diffusion electrode is made by porous material, for example carbon electrode.The utility model people of present patent application finds through research, the porous structure of electrode material can form capillary effect, make to arrive solution diffusion rapidly on this auxiliary electrode under capillarity of this electrode, the power that this diffusion on auxiliary diffusion electrode produces is greater than the surface tension effects of liquid, impels the rapid diffusion of solution on electrode to reach predefined scope.Therefore, oval in shape after the reaction reagent diffusion, the sub-elliptical shape, rectangle, when approximate rectangular or other the size aspect certain is greater than the shape of size of another aspect, the central point of the shape after distance reaction reagent diffusion position far away is (such as the double-pointed outside of transverse, rectangle is than the outside of minor face) when the diffusivity electrode is set, reagent can be faster than that direction that the diffusivity electrode is not set in the rate of propagation of this direction, therefore, be conducive to make reagent to arrive the profile border of shape in all directions simultaneously, thereby be conducive to improve the homogeneity of diffusion of reagents.For reaching this purpose, any position that can be relatively slow in diffusion of reagents speed arranges one or more auxiliary diffusion electrode that increases diffusion of reagents speed.In another preferred version, auxiliary diffusion electrode, according to the character that drips solution, is done hydrophilic treatment to auxiliary diffusion electrode in advance.
In embodiment as described in Figure 7, biology sensor also is included on electrode system and is coated with reaction reagent diffusion-controlled layer 5, comprises the reaction reagent diffusion control district 6 with opening on this key-course 5.The aperture area of diffusion of reagents control zone 6 is with need to be added on reagent area on electrode identical and just in time be positioned on the electrode activity zone.Have on reaction reagent diffusion-controlled layer 5 with the space of groove 9 and manufacture layer 7, upper cover 8 covers on described space manufacture layer 7 and with the groove 9 of space manufacture layer 7 and has formed a path 10 that adds sample.Upper cover 8 is also with vent port 11, and when sample flows in passage by capillary action, the gas that is positioned at the sample front end is discharged from passage by vent port 11, has guaranteed sample flowing smoothly in passage.
Reaction reagent diffusion control district 6 is the holes without wedge angle, and the reaction reagent of interpolation spreads and can arrive the All Ranges that this control zone is set in this control zone.The shape of diffusion of reagents control zone can be the hole with the circular arc limit, shapes such as circle, ellipse, Pear-Shaped.Can also be other shapes that wedge angle do not occur, four quadrilaterals that drift angle is circular arc in the diffusion control district for example.
Can adopt the biology sensor shown in the shop drawings of method shown in Fig. 27.In manufacture process, when this step of Fig. 2 A is added electrode system or afterwards or before, auxiliary diffusion electrode 12 is added on insulating base.Biology sensor shown in Fig. 7 also can be manufactured with additive method.
Alternatively say, biology sensor of the present utility model comprises insulativity base plate 1 and is positioned at the electrode system on the insulativity base plate, include the reaction reagent that can react with the detection sample on electrode system, described electrode system comprise for detection of functional electrode (2,3,4) and for controlling the auxiliary diffusion electrode (10,12) of reaction reagent diffusion, functional electrode is between auxiliary diffusion electrode.The utility model comprises at least two auxiliary diffusion electrodes.Described at least two auxiliary diffusion electrodes lay respectively at the outside of functional electrode.Distance between auxiliary diffusion electrode and functional electrode, just in time make the front end that is added on the reaction reagent on functional electrode can touch this auxiliary diffusion electrode.Functional electrode comprises working electrode, to electrode and reference electrode, these functional electrodes and auxiliary electrode are arranged side by side, and roughly are parallel to each other.Described auxiliary electrode is two, lays respectively at the outside of functional electrode.The insulation course that comprises the cover part electrode system, this insulation course forms a closed region that there is no insulation course in the position at reaction reagent place, on the electrode part that reaction reagent is positioned at this closed region divides, the described closed region surrounded by insulation course has a closed boundary of not having a wedge angle, reaction reagent covers this closed region, and does not exceed this closed boundary.Described closed boundary be shaped as relative oval or four rectangles that drift angle is circular arc of circle, ellipse, two.The thickness of described insulation course is the 3-30 micron.
Below explain again principle of work of the present utility model.
Please refer to Figure 18.Figure 18 is a kind of situation of reaction reagent diffusion in prior art.Wherein, label 200 is the reaction reagents after diffusion, label 6 is the closed regions (being referred to as again in this application reaction reagent diffusion control district) that surrounded by insulating material, label 7 is that layer is manufactured in space, label 9 is that layer 7 a formed groove are manufactured in space, and space is manufactured layer 7 and is used to form the sidewall of this groove 9 and insulating base 1 and upper cover 8 and jointly formed sample channel 10.Through research and experiment, we find, those are positioned at the reaction that reaction reagent outside path 10 (such as by space, being manufactured the part reagent that layer is covered) did not participate in and detected sample basically, only have those reaction reagents that are positioned at path 10 just to participate in and detect the reaction of sample, the amount of the reaction reagent in path 10 is the key factor that affects testing result.Therefore, the deviation that effectively reduces the amount of the reaction reagent in passage between the different product of same batch of production will be conducive to improve the accuracy of the testing result of these products.
In the prior art, because the closed region 6(formed by insulation course is referred to as again reaction reagent diffusion control district in this application) be square, rectangles etc. are with the shape of wedge angle, the different product of same batch of production is when adding reaction reagent, the shape difference opposite sex of reaction reagent after the interior diffusion in closed region 6 large (because reaction reagent is not easy to cover all wedge angle zones), the otherness of the area between different product after the reaction reagent diffusion is also larger, and the reaction reagent total amount of adding equates basically, therefore, there is larger difference in thickness between different product after the reaction reagent diffusion, thereby cause the amount of the reaction reagent in path 10 to have larger difference.That is,, between different product, the consistance of the amount of the reaction reagent in path 10 is poor.This will cause detecting identical sample with the different product of same batch of production, and the testing result deviation obtained is larger, thereby causes testing result inaccurate.
Please refer to Figure 19.In the utility model, because the closed region 6(formed by insulation course is referred to as again reaction reagent diffusion control district in this application) be circular, oval or other is not with the shape of wedge angle, when adding liquid reaction reagent, reaction reagent is more easily filled full whole closed region 6 than prior art, and is not easy to stay " dead angle " that some are not covered by reaction reagent.Therefore, the different product of same batch of production is when adding reaction reagent, the shape difference opposite sex of reaction reagent after the interior diffusion in closed region 6 less (basically consistent with the shape of closed region), the otherness also less (being substantially equal to the area of closed region) of the area between different product after the reaction reagent diffusion, and the reaction reagent total amount of adding equates basically, therefore, thickness between different product after the reaction reagent diffusion equates basically, thereby the amount of the reaction reagent in path 10 equates basically.That is,, between different product, the consistance of the amount of the reaction reagent in path 10 is better.This will make with the different product of same batch of production and detect identical sample, and the testing result deviation obtained is less, thereby improve the accuracy of testing result.
In the employing of the utility model increases the technical scheme of auxiliary electrode, research and experimental result show: be not easy to arrive (comprise and often can not arrive within the predetermined time and can not arrive once in a while) or will improve the diffusivity of reaction reagent in these zone than the technical scheme of zone (this zone should be covered by reaction reagent) the increase auxiliary electrode of other obvious more late arrival in zone when reaction reagent spreads, therefore this scheme is conducive to promote reaction reagent evenly to spread in closed region and covers whole closed region, but the border that does not exceed closed region, thereby reach the purpose that makes the even thickness after reaction reagent spreads.(include but not limited to instructions and claim) in present patent application, that reaction reagent is filled, filled is full, it is full just to fill, just fill, cover, just cover (or other similar terms) closed region 6 refers to that reaction reagent has covered the entire area of closed region 6 basically fully, but does not basically exceed or overflow again the border of this closed region 6.According to top analysis, this technical scheme has improved the accuracy of testing result.
Biology sensor as shown in Figure 3 comprises insulativity base plate 1, working electrode 2, to electrode 3 and reference electrode 4.Be coated with reaction reagent diffusion-controlled layer 5 on electrode system, comprise on this key-course 5 that has an oval-shaped reaction reagent diffusion control district 6, the reagent area of the aperture area of this diffusion of reagents control zone 6 and the required interpolation of electrode is identical and just in time be positioned on the electrode activity zone.The described biology sensor of the present embodiment also comprises that layer 7 is manufactured in space and with the upper cover 8 of vent port.
Method by a liquid in the biology sensor manufacture process is added reaction reagent on electrode to by oval-shaped diffusion of reagents control zone.After reaction reagent adds on electrode system, with digital Stereo microscope (microscope model MOTICAM 2306, Mike's Christian Dior Industry Group Co.,Ltd of manufacturer) distribution situation to reagent on electrode is taken pictures, the distribution situation figure with observing response reagent on electrode.As Fig. 4 shows, the reaction reagent diffusion be added on electrode is even, does not also have reagent to overflow the sideline 6-1 that the diffusion of reagents control zone limits.And reaction reagent 200 is paved with the whole reagent area of being set by sideline 6-1, and whole control zone has all shown the color of reaction reagent.Therefore the consistance that in the described biology sensor of the present embodiment, reaction reagent distributes on electrode is good.
The circular reaction reagent diffusion-controlled layer 5 of being shaped as of reaction reagent diffusion control district 6 as shown in Figure 5.Method by a liquid in the biology sensor manufacture process is added reaction reagent on electrode to by circular diffusion of reagents control zone.After reaction reagent adds on electrode system, with digital Stereo microscope (microscope model MOTICAM 2306, Mike's Christian Dior Industry Group Co.,Ltd of manufacturer) distribution situation to reagent on electrode is taken pictures, the distribution situation figure with observing response reagent on electrode.As Fig. 6 shows, the reaction reagent of interpolation at working electrode 2, to electrode 3 and reference electrode on evenly diffusion, do not have reagent to overflow the sideline 6-1 that the diffusion of reagents control zone limits yet.And reaction reagent 200 is paved with whole reagent area, whole control zone has all shown the color of reaction reagent.Therefore the consistance that in the described biology sensor of the present embodiment, reaction reagent distributes on electrode is good.
The electrode system of biology sensor as shown in Figure 7 comprises functional electrode 2,3,4 and auxiliary electrode 12.This biology sensor also comprises the reaction reagent diffusion-controlled layer 5 with oval 6.Method by a liquid in the biology sensor manufacture process is added reaction reagent on electrode to by oval-shaped diffusion of reagents control zone.After reaction reagent adds on electrode system, with digital Stereo microscope (microscope model MOTICAM 2306, Mike's Christian Dior Industry Group Co.,Ltd of manufacturer) distribution situation to reagent on electrode is taken pictures, the distribution situation figure with observing response reagent on electrode.As Fig. 8 shows, the reaction reagent of interpolation is evenly diffusion on electrode, does not also have reagent to overflow the sideline 6-1 that the diffusion of reagents control zone limits.And reaction reagent 200 is paved with whole reagent area, whole control zone has all shown the color of reaction reagent.Therefore the consistance that in the described biology sensor of the present embodiment, reaction reagent distributes on electrode is good.
The reaction reagent diffusion-controlled layer 5 with Double Circle 6 as shown in Figure 9.Double Circle diffusion of reagents key-course head to head can be used for manufacturing two biology sensors simultaneously.In manufacturing the process of biology sensor, placement two cover electrode systems head to head on insulating base, comprise working electrode 2, to electrode 3 and reference electrode 4, and comprise auxiliary diffusion electrode 12.As Fig. 9 comprises three auxiliary diffusion electrodes 12, two outermost end at the functional electrode of two covers (working electrode 2, to electrode 3 and reference electrode 4) wherein, another in the middle of the functional electrode of two covers as the auxiliary diffusion electrode shared.After being placed on this electrode system by the reaction reagent diffusion layer shown in Fig. 9, toward dropwise reaction reagent on electrode system.
Method by a liquid in the biology sensor manufacture process is added reaction reagent on electrode to by oval-shaped diffusion of reagents control zone.After reaction reagent adds on electrode system, with digital Stereo microscope (microscope model MOTICAM 2306, Mike's Christian Dior Industry Group Co.,Ltd of manufacturer) distribution situation to reagent on electrode is taken pictures, the distribution situation figure with observing response reagent on electrode.As Figure 10 shows, the reaction reagent diffusion of interpolation evenly, does not have reagent to overflow the sideline 6-1 that the diffusion of reagents control zone limits yet.And reaction reagent 200 is paved with whole reagent area, whole control zone has all shown the color of reaction reagent.Therefore the consistance that in the described biology sensor of the present embodiment, reaction reagent distributes on electrode is good.
The reaction reagent diffusion-controlled layer 5 of the drift angle double square diffusion of reagents control zone 6 that is arc as shown in figure 11.This double square diffusion of reagents key-course can be used for manufacturing two biology sensors simultaneously.In manufacturing the process of biology sensor, on insulating base placement two cover electrode systems head to head comprise working electrode 2, to electrode 3 and reference electrode 4.Also comprise auxiliary diffusion electrode 12.As Figure 11 comprises three auxiliary diffusion electrodes 12, two outermost end at the functional electrode of two covers wherein, the auxiliary diffusion electrode of another centre at the functional electrode of two covers for sharing.After being placed on this electrode system by the reaction reagent diffusion layer shown in Figure 11, toward dropwise reaction reagent on electrode system.
Add on electrode the diffusion of reagents control zone of the rectangle by having the circular arc drift angle by reaction reagent of the method by a liquid in the biology sensor manufacture process.After reaction reagent adds on electrode system, with digital Stereo microscope (microscope model MOTICAM 2306, Mike's Christian Dior Industry Group Co.,Ltd of manufacturer) distribution situation to reagent on electrode is taken pictures, the distribution situation figure with observing response reagent on electrode.As Figure 12 shows, the reaction reagent diffusion of interpolation evenly, does not have reagent to overflow yet.And reaction reagent is paved with whole reagent area, whole control zone has all shown the color of reaction reagent.Therefore the consistance that in the described biology sensor of the present embodiment, reaction reagent distributes on electrode is good.
To manufacture biology sensor according to the method for prior art as shown in figure 13.Add electrode system on insulativity base plate 1, will cover on electrode with the diffusion-controlled layer 5 of rectangle diffusion of reagents control zone 6, and rectangle diffusion of reagents control zone just in time is positioned at the active region of electrode, electrode need to add the zone of reaction reagent.Method by a liquid is added reaction reagent on electrode to by this slotted eye of diffusion of reagents control zone, then covers space and manufactures layer 7 and upper cover 8.
After reaction reagent adds on electrode system, with digital Stereo microscope (microscope model MOTICAM 2306, Mike's Christian Dior Industry Group Co.,Ltd of manufacturer) distribution situation to reagent on electrode is taken pictures, the distribution situation figure with observing response reagent on electrode.As Figure 14 shows, the reaction reagent of interpolation can not cover whole rectangle region, and 50 places, four tops in rectangle diffusion control district all do not have reagent to arrive, and have the reagent of interpolation to overflow in the rectangle region both sides, and this has just caused the reagent on electrode in uneven thickness.
The analysis of the accuracy that embodiment 7 biology sensors are measured glucose content in standard items
Configuration dextrose standard sample solution, and with the glucose content in this standard solution of biosensor assay in embodiment 3 and embodiment 6.
Table 1 and Figure 15 are the glucose contents utilized in the biosensor assay standard items of embodiment 3 described in the utility model.Its electrode system of biology sensor in embodiment 3 comprises auxiliary diffusion electrode, and comprises the reaction reagent diffusion-controlled layer with oval diffusion control district.Measurement result shows, the coefficient R of its mensuration
2Value has reached 0.9993.Table 2 and Figure 16 are the glucose contents utilized in the biosensor assay standard items of embodiment 6 in prior art.Biology sensor in embodiment 6 does not comprise auxiliary diffusion electrode, and reaction reagent diffusion control district is a rectangle that drift angle is right angle.Measurement result shows, the coefficient R of its mensuration
2Value is only 0.9941.
Table 1 utilizes the measurement result of glucose content in the biosensor assay standard items in embodiment 3
| Glucose configuration concentration (mg/dL) | 55.7 | 84.0 | 117.9 | 177.9 | 223.5 | 298.0 | 448.7 | 575.0 |
| Measurement result (mg/dL) | ||||||||
| | 57 | 82 | 116 | 177 | 223 | 298 | 449 | 565 |
| | 55 | 84 | 118 | 178 | 226 | 294 | 454 | 582 |
| | 55 | 81 | 120 | 177 | 223 | 293 | 441 | 582 |
| | 56 | 80 | 122 | 180 | 218 | 293 | 448 | 566 |
| | 56 | 82 | 119 | 175 | 222 | 295 | 439 | 577 |
| | 56 | 83 | 119 | 183 | 229 | 295 | 449 | 563 |
| | 57 | 82 | 122 | 179 | 224 | 303 | 458 | 566 |
| | 56 | 82 | 119 | 178 | 224 | 294 | 459 | 565 |
| | 57 | 84 | 121 | 175 | 223 | 309 | 455 | 581 |
| Test 10 | 57 | 84 | 120 | 174 | 226 | 296 | 449 | 585 |
| Mean value | 56.2 | 82.4 | 119.6 | 177.6 | 223.8 | 297.0 | 450.1 | 573.2 |
| SD | 0.8 | 1.3 | 1.8 | 2.7 | 2.9 | 5.2 | 6.6 | 8.9 |
| CV | 1.4% | 1.6% | 1.5% | 1.5% | 1.3% | 1.7% | 1.5% | 1.6% |
Table 2 utilizes the measurement result of glucose content in the biosensor assay standard items in embodiment 7
| Glucose configuration concentration (mg/dL) | 51.5 | 86.0 | 105.4 | 170.6 | 215.2 | 283.2 | 444.4 | 560.9 |
| Measure concentration (mg/dL) | ||||||||
| | 57 | 74 | 122 | 173 | 195 | 276 | 470 | 543 |
| | 57 | 73 | 112 | 188 | 204 | 272 | 472 | 540 |
| | 58 | 74 | 109 | 183 | 197 | 279 | 462 | 560 |
| | 57 | 77 | 121 | 183 | 196 | 302 | 435 | 537 |
| | 55 | 73 | 115 | 170 | 214 | 280 | 485 | 531 |
| | 54 | 75 | 122 | 180 | 215 | 279 | 440 | 577 |
| | 54 | 75 | 117 | 172 | 203 | 305 | 433 | 551 |
| | 54 | 76 | 111 | 184 | 203 | 294 | 436 | 576 |
| | 56 | 77 | 119 | 169 | 214 | 274 | 439 | 569 |
| Test 10 | 55 | 77 | 110 | 173 | 196 | 274 | 449 | 571 |
| Mean value | 55.7 | 75.1 | 115.8 | 177.5 | 203.7 | 283.5 | 452.1 | 555.5 |
| SD | 1.5 | 1.6 | 5.1 | 6.8 | 8.0 | 12.2 | 18.7 | 17.3 |
| CV | 2.7% | 2.1% | 4.4% | 3.8% | 3.9% | 4.3% | 4.1% | 3.1% |
From experimental result, can find out, adopted auxiliary diffusion electrode in embodiment 3, and comprise the biology sensor of the reaction reagent diffusion-controlled layer with oval diffusion control district, the coefficient of variation (CV) and the standard variance (SD) of the result that the coefficient of variation of its test result (CV) and standard variance (SD) are all measured than biology sensor of the prior art (do not adopt auxiliary diffusion electrode, and the diffusion of reagents control zone being designed for rectangle) are worth low.Therefore utilize glucose content in biosensor assay sample of the present utility model, the favorable reproducibility of its content measuring (, detect the sample of same batch with a plurality of biology sensors of same batch of production, otherness between resulting testing result is less than prior art), test result is more accurate.
Claims (7)
1. biology sensor, it is characterized in that, comprise the insulativity base plate and be positioned at the electrode system on the insulativity base plate, include reaction reagent and the insulation course that can react with the detection sample on electrode system, this insulation course cover part electrode system, but the position at the reaction reagent place forms a closed region that there is no insulation course, on the electrode part that reaction reagent is positioned at this closed region divides, the described closed region surrounded by insulation course has one and does not have angular closed boundary, reaction reagent covers this closed region, and does not exceed this closed boundary.
2. biology sensor according to claim 1, is characterized in that, described closed boundary be shaped as relative oval or four rectangles that drift angle is circular arc of circle, ellipse, two.
3. biology sensor according to claim 2, is characterized in that, reaction reagent is filled full described closed region just, and the area of reaction reagent overlay area equates with the area of closed region.
4. biology sensor according to claim 3, is characterized in that, the thickness of described insulation course is the 1-50 micron.
5. biology sensor according to claim 4, is characterized in that, the thickness of described insulation course is the 3-30 micron.
6. biology sensor according to claim 5, is characterized in that, the material of described insulation course is hydrophobic material.
7. biology sensor according to claim 1, it is characterized in that, the both sides of the electrode part covered by reaction reagent at electrode system also respectively comprise an auxiliary diffusion electrode, and described auxiliary diffusion electrode partly is arranged side by side with the electrode covered by reaction reagent.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103454321A (en) * | 2013-03-28 | 2013-12-18 | 利多(香港)有限公司 | Biosensor and manufacturing method thereof |
| CN113820375A (en) * | 2021-08-30 | 2021-12-21 | 杭州微策生物技术股份有限公司 | Electrochemical sensor for measuring selected characteristic substances in body fluid and preparation method |
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2013
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103454321A (en) * | 2013-03-28 | 2013-12-18 | 利多(香港)有限公司 | Biosensor and manufacturing method thereof |
| CN103454321B (en) * | 2013-03-28 | 2015-09-09 | 利多(香港)有限公司 | Biology sensor and manufacture method thereof |
| CN113820375A (en) * | 2021-08-30 | 2021-12-21 | 杭州微策生物技术股份有限公司 | Electrochemical sensor for measuring selected characteristic substances in body fluid and preparation method |
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