Patent Application
20090124876
The present invention relates to a needle integrated biosensor. More particularly, it relates to a needle integrated biosensor having such a constitution that a puncture needle for collection of blood by piercing the skin and a biosensor for collection and analysis of body fluids which are taken out to the outside the skin surface are integrated.
Up to now, there have been cases where a patient himself/herself suffering from diabetes mellitus collects his/her blood and measures the blood sugar level which is a glucose content in blood. In that case, the patient uses a blood collecting instrument called a lancet where a blood collecting needle is attached and detached to collect the blood by piercing his/her finger or arm and transfers the collected blood to a blood sugar level analyzer to measure the blood sugar level. According to such a measuring system, the patient must carry a set of measuring instrument comprising several items such as blood sugar level analyzer, lancet, blood collecting needle and analyzing element and conduct the measurement by assembling them upon necessity. Thus, a long period of training is needed for its operation and considerable time is required until a reliable measurement is able to be conducted by the patient himself/herself. In fact, measurement at the site other than fingers and forearms (such as abdominal wall and earlobe) is difficult for even skilful persons. In recent years, due to the needs for providing a minimally invasive sample having less pain, a biosensor by which measurement is possible where the amount of the sample is 1 μl or less has been developed and, in the case of such a very small amount, a work for a correct supply of a sample to a biosensor is very difficult. As a result, a error in the measurement is resulted and there are inconveniences that the patient who is a person to be measured must be punctured once again and that a biosensor must be also exchanged to make a fresh start for the measurement.
Patent Document 1: Japanese Patent Laid-Open No. Hei09-266898
Patent Document 2: Examined Japanese Patent Application Publication No. Hei08-020412
Under such circumstances, various needle integrated biosensors have been devised. Firstly, in a needle integrated biosensor mentioned in the Patent Document 3, each of a puncture needle and a biosensor is set at different positions in an inner area of a measuring apparatus of a pen type (like a two-colored ball point pen) equipped with a driving part for a puncture needle and, after the front end of the pen-shaped measuring apparatus is applied to the skin of a person to be tested and pierced, a biosensor is exposed at the front end to collect the blood whereupon measurement of blood sugar level is conducted. In this method however, troublesomeness that each of the needle and the biosensor must be set onto a measuring apparatus has not been solved.
In another needle integrated biosensor as mentioned in the Patent Document 4, a puncture needle is subjected to driving from outside and there is adopted an integrated structure where a puncture needle moves parallel along a longitudinal direction of a slender biosensor in a small piece. However, in such a type, since a puncture needle is exposed from a biosensor, a cover which protects the front end of the puncture needle is necessary and, further since the puncture needle moves in a path for collection and conveyance of the blood and in a reagent layer, there is a risk that the surface of the puncture needle is contaminated by a reagent before the puncture needle pierces the skin of the person to be tested. Moreover, in such a type, since the puncture needle is exposed from the biosensor, a cover for protecting the front end of the puncture needle is necessary and, further, there is no other way than to utilize a capillary phenomenon for sending the collected blood after piercing to the biosensor.
Still further, in the conventional needle integrated biosensor, the structure is complicated, amount of the collecting blood necessary as a sample liquid is too much and there is an affection by intake into unnecessary spaces.
An object of the present invention is to provide a needle integrated biosensor where, in a biosensor in which a biosensor equipped with at least two electrodes and a puncture needle for collection of body fluids by piercing the skin of a person to be tested are integrated, the puncture needle is able to be kept hygienic without a protective cover or the like for the puncture needle.
Another object of the present invention is to provide a needle integrated biosensor by which an efficient sending of the collected blood after piercing is able to be made possible.
The object of the present invention as such is able to be achieved by a needle integrated biosensor where, in a biosensor in which a biosensor equipped with at least two electrodes and a puncture needle for collection of body fluids by piercing the skin of a person to be tested are integrated, a soft material is attached to the front end of the puncture needle whereby the front end of the needle is protected.
Another object of the present invention is able to be achieved by a needle integrated biosensor where, in a biosensor having such a constitution that a biosensor equipped with electrode and spacer and a puncture needle for collection of body fluids by piercing the skin of a person to be tested aligned in the biosensor are integrated by means of a puncture needle support in a space between two electrically insulating substrates, a piercing and blood-collecting opening at the front end of the puncture needle is tightly closed by a puncturable soft material while, in the rear end of the puncture needle, space between two substrates and the puncture needle support is tightly closed by a shrinkable material and the inner area of the biosensor is kept in a negative pressure whereby blood is collected by suction and the components to be detected are measured when the puncture needle breaks through both of the soft material and the skin by being driven from outside.
Still another object of the present invention is able to be achieved by a needle integrated biosensor where, in a biosensor having such a constitution that a biosensor equipped with electrode and spacer and a puncture needle for collection of body fluids by piercing the skin of a person to be tested aligned in the biosensor are integrated by means of a puncture needle support in a space between two electrically insulating substrates, each of the above substrates is equipped with a cutting part by which separation of substrate part where no electrode is formed, a piercing and blood-collecting opening at the front end of the puncture needle is tightly closed by a puncturable soft material, cutting parts of the two substrates are covered by a shrinkable material equipped at the rear end of the puncture needle and tightly close the space between the two substrates and the puncture needle so that the inner area of the biosensor is tightly closed and, after the puncture needle breaks through both of the soft material and the skin at the same time by being driven from outside, a part of the substrates is separated at the above cutting part and the volume of the inner area of the biosensor is increased to make the inner area negative pressure whereby blood is collected by suction and the components to be detected are measured.
In a needle integrated biosensor in accordance with the present invention, a soft material is attached to the front end of the puncture needle so that the front end of the needle is protected whereby there is achieved an excellent effect that the puncture needle is able to be kept hygienic until actual use. Moreover, in the needle integrated biosensor having such a constitution, no material such as a protective cover for the puncture needle is necessary and, therefore, its operation is excellent and reduction of the manufacturing cost is also able to be achieved.
Further, in a needle integrated biosensor in accordance with the present invention, a suction means is used together with a capillary phenomenon in sending the collected blood into a biosensor and, therefore, the collected blood after piercing is able to be efficiently sent into the biosensor. Still further, since the puncture needle is included in the biosensor, no cover which protects its front end is necessary and that is appreciated in terms of safety as well. Furthermore, when the puncture needle is aligned in parallel to the long-axial direction of the electrode, contact of the puncture needle to reagent layer, etc. formed on the electrode is able to be prevented whereby it is now possible to avoid the inconvenience such as pollution of the puncture needle with the reagent, etc.
In addition, since a suction means in addition to the capillary phenomenon is used in sending the collected blood into the biosensor in accordance with the needle integrated biosensor of the present invention, the collected blood after piercing is able to be efficiently sent into the biosensor. Moreover, since the puncture needle is included in the biosensor, no cover for protecting its front end is necessary and that is appreciated in terms of safely as well.
Further, when the puncture needle is aligned in such a mode of being crossed at right angles to the long-axial direction of the electrode, there is achieved an excellent effect that an efficient measurement is possible without collection of blood which is in more than the necessary amount after piercing. Furthermore, in the case of a shape where are bilaterally asymmetric to the puncture needle which is the central line, a wrong insertion into the measuring apparatus in use is able to be prevented.
As to a substrate, an electrically insulating one is sufficient and, for example, plastic, biodegradable material, paper, etc. is used therefor and, preferably, polyethylene terephthalate is used therefor. In the substrate, a cutting part is formed at the area after a puncture needle from the electrode forming site. The cutting part is formed as an easily cuttable binding part such as at least one linear binding part between the substrates or, preferably, a linear binding part where the central area is constricted or is constituted as a groove in a depth which does not penetrate the substrate at least on one side of the substrate or, preferably, as a V-shaped groove. As to the linear binding part, that having a width of 0.2 to 2 mm or, preferably, 0.5 to 1 mm and a length of 0.2 to 2 mm or, preferably, 0.5 to 1 mm is used specifically. Such cutting parts are formed on the same position when two substrates are aligned oppositely.
The electrode is formed on a substrate by a screen printing method, a vapor deposition method, a sputtering method, a foil adhesion method, a galvanizing method, etc. and, as to a material therefor, carbon, silver, silver/silver chloride, platinum, gold, nickel, copper, palladium, titanium, iridium, lead, tin oxide and platinum black may be exemplified. As to the carbon hereinabove, carbon nanotube, carbon microcoil, carbon nanohone, fullerene, dendrimer or a derivative thereof may be used.
The electrode may be a two-electrode method formed by working electrode and counter electrode, a three-electrode method formed by working electrode, counter electrode and reference electrode or an electrode method formed by more electrode numbers. When a three-electrode method is adopted, a transfer speed of collected blood introduced into a conveying path is able to be measured in addition to an electrochemical measurement of the substance to be measured whereby a hematocrit value is able to be measured. It is also possible to constitute from two or more sets of electrode system. Those electrodes are formed together on a sheet of substrate or separately on two sheets of substrate.
Although those electrodes are formed together on a sheet of substrate or separately on two sheets of substrate, a facing structure where electrode is oppositely aligned on two substrates or, to be more specific, a facing structure where electrodes formed on the surfaces of two substrates sandwich a spacer comprising resist layer or adhesive layer is preferred from the viewpoint of making the sample volume small. As a result thereof, electrochemical reaction proceeds efficiently and volume of reaction layer can be effectively made small by shortening of distance between electrodes and of electrode area whereby it is possible to make the amount of the sample small.
A reagent layer (electrode reaction part) is able to be formed on a substrate where electrode is formed. The reagent layer is formed by a screen printing method or a dispenser method and fixation of the reagent layer onto the electrode surface or the substrate surface is able to be conducted by a covalent bond method or an adsorbing method accompanied by drying. With regard to a reagent aligned to the electrode reaction part of the biosensor, that which contains glucose oxidase which is an oxidizing enzyme and potassium ferricyanide as a mediator may be exemplified when constitution is done for the measurement of blood sugar level. When the reagent is dissolved in blood, an enzymatic reaction starts and, as a result, potassium ferricyanide coexisting in the reaction layer is reduced and potassium ferrocyanide which is an electron transmitter of a reduced type is accumulated. Its amount is proportional to the substrate concentration or, in other words, the concentration of glucose in blood. The electron transmitter of a reduced type which is accumulated for a predetermined period is oxidized by electrochemical reaction. An electron circuit in the main body of the measuring apparatus which will be mentioned later calculates and determines the glucose concentration (blood sugar level) from the positive electrode current measured at that time and displays it onto the display aligned on the surface of the main body.
Surfactant and lipid may also be applied around the opening for collection of blood and on the surface of electrode or reagent layer (electrode reaction part). As a result of application of the surfactant and the lipid, it is now possible to make the transfer of the sample smooth.
At that time, as a result of application of reagent layer, surfactant or lipid into the conveying path of the sample, there is a possibility that a puncture needle contained therein is contaminated. In order to prevent the pollution as such, it is preferred that such a reagent is not applied around the front end of a puncture needle.
In the biosensor where a reagent layer is equipped on the electrode where the above blood collection is satisfied, the collected blood reacts with the reagent when the collected blood sent from the opening for blood collection contacts to the reagent layer on the electrode. This reaction is monitored as electric changes in the electrode.
It is also possible that the electrode of the biosensor is provided by a resist layer and the resist layer is also able to be easily formed by a screen printing or the like. Like an adhesive, there is no particular limitation for the resist in that case provided that it does not react with or is not dissolved in the substrate and its examples are an ultraviolet-hardening vinyl-acrylic resin, urethane-acrylic resin and polyester-acrylic resin. Main object for the use of a resist is to make the electrode pattern clear and to clarify the stipulation of the above electrode area and other object is to insulate the sample-conveying path where no reagent layer is present. For that purpose, the resist layer may or may not form the same pattern as the adhesive layer. In the latter case, it is preferred that the resist layer is formed on an electrode substrate for the sake of insulation. Further, when the resist layer is formed thicker than the electrode in a sample-conveying path where the puncture needle of the needle integrated biosensor according to the present invention is received, contact of the puncture needle to the electrode is able to be suppressed. Such a resist layer is also able to be formed by a screen printing method and, for example, a resist layer formed by any of the above materials in the thickness of about 50 to 500 μm or, preferably, about 10 to 100 μm also acts as a spacer.
Two substrates are adhered by an adhesive such as that of an acrylic resin type to constitute a biosensor. Such an adhesive layer is also able to be formed by a screen printing method, is formed in a thickness of about 5 to 500 μm or, preferably, about 10 to 100 μm and, like a resist layer and acts as a spacer as well. It is also possible that the above reagent is contained in the adhesive layer. The adhesive layer may be in a pattern which is same as or is different from the resist layer.
When the substrate having the above constitution in which a puncture needle is installed is folded along a connecting part, a biosensor as a folded molding product is able to be manufactured. As to the connecting part, that having a length of not shorter than the thickness of a spacer or, 0.5 to 4 mm and, preferably, 1.0 to 3.0 mm is placed preferably between the two substrates in at least two places. The connecting part as such in a length of about 0.5 to 0.9 mm is able to be formed as a perforation in a broken line on an insulating substrate using, for example, a cogwheel-shaped thin disk where its convex part is a blade while, in the case of a connecting part in a length of about 1 to 4 mm, the insulating substrate is punched with a mold to subject to a hinge molding. When the connecting part is in a length of about 1 to 4 mm, it is not necessary that the folded area is subjected to a thermal adhesion with pressure or fixed using a fixing device so as to prevent a backward bending. In the case of a biosensor which is a folded molding product as such, it is possible to manufacture a lot of biosensors at a time by such a means that a connecting part as a folding line is formed in a horizontal way to a direction of long axis of along substrate, then electrode, etc. are formed, folding along the connecting part is conducted and punching into a shape of a sensor is done. In a needle integrated biosensor which is manufactured by such a method, reproducibility is also very good and it has advantages which have not been achieved in the conventional layered method.
In a sample-conveying path of a biosensor, there is installed a puncture needle which is, for example, in parallel to the direction of long axis of electrode and pierces the skin of a person to be tested so as to collect the body fluid.
With regard to a puncture needle for collecting the body fluid from the skin of a person to be tested, since it is necessary to pass through the soft material and further pierce the body to be tested, it is desired to have strength durable the above and to be sharp and, furthermore, it is to be a fine puncture needle for suppressing the pain upon piercing. To be more specific, that made by Terumo Corporation and being 21 to 33 gauges is used. The puncture needle may be either hollow or rod-shaped so far as it is able to break through the skin of the person to be tested. Since the puncture needle is to be hygienically received in a biosensor until its actual use, a photocatalytic function effective for antibiotic and antiviral purpose may be applied to the surface of the front end of the needle. In that case, a membrane of titanium oxide or titanium dioxide is preferred.
In a biosensor, a puncture needle for piercing the skin of the person to be tested and to collect the body fluid is installed. Although the puncture needle may be in any alignment such as in parallel or at right angles to the electrode, it is placed in a state of crossing the electrode at the angles of 30 to 90° or, preferably, at right angles. When a puncture needle is placed in a state of being right angles to the electrode, amount of the collecting blood is able to be suppressed as compared with the case where the puncture needle is placed in parallel to the long axial direction of the electrode and, moreover, when the terminal for measurement is placed at the position which is apart from the orbit of the puncture needle, the shape of the needle integrated biosensor is bilaterally asymmetric along the puncture needle as a central line whereby a user is able to adopt it as a mark so that an error for right and left in inserting into a measuring apparatus is able to be avoided and the measuring apparatus is also able to be equipped with a mechanism for specifying the position of the measuring terminal of the needle integrated biosensor according to the present invention.
A soft material is attached to the front end or the puncture needle or, to be more specific, at least to the area contacting to the body to be tested. As a result, the front end of the needle is protected. Until a step where a puncture needle is subjected to a piercing drive and to breaking through the skin of the person to be tested, it is necessary that the soft material does not attach to the surface of the puncture needle and that pieces thereof, etc. are not mixed with the collected blood and, therefore, it is fixed on at least a part of a biosensor such as a substrate using an adhesive of an acrylate type.
Examples of such a soft material are gel-like material, elastic material and foamed material and, in the case of a foamed material, an example thereof is an artificial skin which is very similar to the skin to be pierced and, preferably, is able to be sterilized. As to a sterilizing method, there may be used sterilization with ethanol, sterilization by dry heating, autoclave, ultraviolet ray, gamma ray, etc. and, for example, agar which is one of the gel-like materials is sterilized by an autoclave, cooled and applied to the front end of a needle before gelling.
It is also possible to give an antibiotic action to the soft material. As to a material having an antibiotic action, metal such as copper and silver has been known and a soft material having an antibiotic action is prepared when small amount of such a metal is contained in a soft material.
During the manufacture of a biosensor of the present invention, it is constituted in such a manner that, under a condition of negative pressure than the outer air or, preferably, under a vacuum condition, a space between a support for a puncture needle and two substrates constituting the biosensor at the side of a piercing drive is constituted so as to give a tightly closed state by a shrinkable material such as natural rubber whereby the inner area of the sensor is tightly closed in a negative pressure state and, in the transfer of the collected blood to a sample-conveying path after piercing, a suction means is able to be used in addition to a capillary phenomenon. At that time, when a puncture needle is further pulled in the direction opposite to the piercing direction immediately after the piercing, the shrinkable material is extended and the collected blood is able to be sucked under the state where the inner negative pressure is further enhanced. As a result of adoption of the constitution as such, it is now possible to smoothly conduct the collection of the blood.
Further, an opening for collection of blood by piercing in the biosensor of the present invention is covered by a soft material such as silicone rubber, soft polyurethane, polyvinyl chloride and foamed styrene and, in the piercing driving side, its constitution is in such a manner that the space between s support for a puncture needle and two substrates constituting the biosensor is made tightly closed by a shrinkable material (shrinkable agent) such as natural rubber. During the manufacture of the biosensor as such, the inner area of the sensor is tightly closed under the condition of negative pressure than the outer air or, preferably, under a vacuum condition whereby the inner area of the sample-conveying path of the biosensor is made in negative pressure than the outer air pressure. As such, in the needle integrated biosensor according to the present invention, a suction means is used in addition to a capillary phenomenon for transfer of the collected blood to a sample-conveying path so that the collection of blood after piercing is conducted smoothly. At that time, when a puncture needle is further pulled in the direction opposite to the piercing direction immediately after the piercing, the shrinkable material is extended and the collected blood is able to be sucked under the state where the inner negative pressure is further enhanced.
Further, an opening for collection of blood by piercing in the biosensor of the present invention is covered by a soft material such as silicone rubber, soft polyurethane, polyvinyl chloride and foamed styrene and, in the piercing driving side, its constitution is in such a manner that the space between s support for a puncture needle and two substrates constituting the biosensor including a cutting part is made tightly closed by a shrinkable material such as natural rubber. As a result of the above constitution, inner area of the sensor is tightly closed and, with regard to transfer of the collected blood after piercing to a sample-conveying path, a suction means is able to be used in addition to a capillary phenomenon whereby it is now possible to collect the blood smoothly. Here, in the needle integrated biosensor according to the present invention, the terminal is able to be made outside of the orbit of the puncture needle as mentioned above and, therefore, a structure for keeping the air tightness of the inner area of the sample-conveying path including the puncture needle is able to be easily available. The soft material covering the opening for piercing and collecting the blood keeps the tightly closed state and also has an effect of improving the close adhesion of the skin of the person to be tested and the opening for piercing and collecting the blood.
It is desirable that the needle integrated biosensor according to the present invention is able to conduct a series of operations of piercing, blood collection and measurement by means of a measuring apparatus equipped with a piercing drive. In that case, with regard to a piercing drive for example, it is preferred to be equipped with a mechanism where the needle pierces the soft material of the biosensor and breaks through the skin of the person to be tested and a mechanism where it quickly returns to the original position immediately after piercing.
Further, when the needle integrated biosensor according to the present invention is equipped with a sucking mechanism, the piercing drive system in the measuring apparatus may be still improved so as to enhance the sucking force upon collection of the blood. Thus, the following constitution may be adopted that, when the puncture needle is further pulled in the direction which is opposite to the piercing direction using a mechanism in which the puncture needle is returned to the original position immediately after piercing, a shrinkable material is extended and the negative pressure in the inner area is made stronger.
In the needle integrated biosensor according to the present invention, it is desirable that the biosensor is set in a measuring apparatus equipped with a piercing drive whereby a series of operations of piercing, blood collection and measurement is carried out. In that case, it is desirable that the piercing drive, for example, is equipped with a mechanism where a needle pierces the soft material of the biosensor and breaks through the skin of the person to be tested and a mechanism where it quickly returns to the original position immediately after the piercing.
It is also possible that a piercing drive system in the measuring apparatus is further improved so as to enhance the sucking force by a needle integrated biosensor upon collection of the blood. Thus, it is also possible that, when the puncture needle is further pulled to the direction which is opposite to the piercing direction using a mechanism for returning the arrangement of puncture needle to the original position immediately after piercing, the shrinkable material is extended as mentioned above so that the negative pressure in the inner area is made stronger.
It is desirable that, in the needle integrated biosensor according to the present invention, a series of operations of piercing, blood collection and measurement is able to be conducted by a measuring apparatus equipped with a piercing drive. In that case, it is desirable that the piercing drive, for example, is equipped with a mechanism where a needle passes through a soft material of a biosensor to break through the skin of a person to be tested and a mechanism where it quickly returns to the original position immediately after the piercing.
Further, in order to enhance the sucking force upon collection of the blood, the piercing drive system in the measuring apparatus is equipped with a mechanism where a cutting part is separated by further pulling of the puncture needle in a direction which is opposite to the piercing direction using a mechanism of returning the arrangement of the puncture needle to the original position immediately after the piercing whereby the shrinkable material covering the cutting part is extended and the inner area of the biosensor becomes negative pressure.
With regard to a measuring apparatus for a needle integrated biosensor, there is used an apparatus in which operability and durability for surely and repeatedly conducting the measurement using the needle integrated biosensor are ensured and which is able to be easily carried and there is also used a measuring apparatus having such a function that a state where the measurement is possible is resulted when a needle integrated biosensor is inserted into an introducing part on the lower area whereby the support for a puncture needle turns upside and the terminal of the biosensor is connected to a connector of the measuring apparatus, then preparation of the measurement is completed when a trigger is pulled so as to give a piercing drive to the inner part of the needle integrated biosensor, then piercing, blood collection and measurement are automatically done in this order by pushing the switch of the piercing initiation button and the measuring result is induced finally.
An example of the characteristics of the measuring apparatus will be mentioned in more detail. In this measuring apparatus, a driving part for a puncture needle and a measuring apparatus part are integrated and the driving part for a puncture needle is constituted from a trigger part, a piercing initiation button part and a driving part made of elastic substances such as spring. On the other hand, in the measuring apparatus part, its fundamental constitution comprises a sensor introducing part, a connector, a circuit for electrochemical measurement, a memory part, an operation panel, a measuring part which measures electric value of the biosensor at the electrode and a display part which displays the measured value at the measuring part and is further able to be installed with electric wave as a wireless means such as Blue Tooth (registered trade mark). Due to such a slide structure, a piercing drive is applied keeping the state where the needle integrated biosensor is surely held whereby the strength of the measuring apparatus as a whole is able to be enhanced. The measuring apparatus is also able to be equipped with a mechanism which is able to recognize the asymmetric structure where a puncture needle of a needle integrated biosensor is a central line at the projected part of the terminal for the measurement.
Further, with regard to a measuring apparatus for a needle integrated biosensor, there is used an apparatus in which operability and durability for surely and repeatedly conducting the measurement using the needle integrated biosensor are ensured and which is able to be easily carried and there is also used a measuring apparatus having such a function that a state where the measurement is possible is resulted when a needle integrated biosensor is inserted into an introducing part on the lower area whereby the support for puncture needle turns upside and the terminal of the biosensor is connected to a connector of the measuring apparatus, then preparation of the measurement is completed when a trigger is pulled so as to give a piercing drive to the inner part of the needle integrated biosensor, then piercing, blood collection and measurement are automatically done in this order by pushing the switch of the piercing initiation button and the measuring result is induced finally.
An example of the characteristics of the measuring apparatus will be mentioned in more detail. In this measuring apparatus, a driving part for a puncture needle and a measuring apparatus part are integrated and the driving part for a puncture needle is constituted from a trigger part, a piercing initiation button part and a driving part made of elastic substances such as spring. On the other hand, in the measuring apparatus part, its fundamental constitution comprises a sensor introducing part, a connector, a circuit for electrochemical measurement, a memory part, an operation panel, a measuring part which measures electric value of the biosensor at the electrode and a display part which displays the measured value at the measuring part and is further able to be installed with electric wave as a wireless means such as Blue Tooth (registered trade mark). Due to such a slide structure, a piercing drive is applied keeping the state where the needle integrated biosensor is surely held whereby the strength of the measuring apparatus as a whole is able to be enhanced.
Further, with regard to a measuring apparatus for a needle integrated biosensor, there is used an apparatus in which operability and durability for surely and repeatedly conducting the measurement using the needle integrated biosensor are ensured and which is able to be easily carried and there is also used a measuring apparatus having such a function that a state where the measurement is possible is resulted when a needle integrated biosensor is inserted into an introducing part on the lower area whereby the support for puncture needle turns upside and the terminal of the biosensor is connected to a connector of the measuring apparatus, then preparation of the measurement is completed when a trigger is pulled so as to give a piercing drive to the inner part of the needle integrated biosensor, then piercing, blood collection and measurement are automatically done in this order by pushing the switch of the piercing initiation button and the measuring result is induced finally.
An example of the characteristics of the measuring apparatus will be mentioned in more detail. In this measuring apparatus, a driving part for a puncture needle and a measuring apparatus part are integrated and the driving part for a puncture needle is constituted from a trigger part, a piercing initiation button part and a driving part made of elastic substances such as spring. On the other hand, in the measuring apparatus part, its fundamental constitution comprises a sensor introducing part, a connector, a circuit for electrochemical measurement, a memory part, an operation panel, a measuring part which measures electric value of the biosensor at the electrode and a display part which displays the measured value at the measuring part and is further able to be installed with electric wave as a wireless means such as Blue Tooth (registered trade mark). Due to such a slide structure, a piercing drive is applied keeping the state where the needle integrated biosensor is surely held whereby the strength of the measuring apparatus as a whole is able to be enhanced. The measuring apparatus is also able to be equipped with a mechanism which is able to recognize the bilaterally asymmetric structure where a puncture needle of a needle integrated biosensor is a central line at the projected part of the terminal for the measurement.
With regard to a piercing drive of the measuring apparatus, a mechanism where, after the upper part of the needle integrated biosensor is struck in the vertical direction, it quickly returns and it is further preferred that the drive has a mechanism where depth of piercing the skin of the persons to be tested is able to be adjusted.
The measuring apparatus is also able to be equipped with a voice guidance function and a voice recognizing function corresponding to the visual impairment caused by diabetes mellitus, a control function for measured data by incorporation of a radio clock, a communication function of measured data, etc. to medical organizations, etc., a charging function and others.
Although there is no particular limitation for the measuring method at the measuring part of the measuring apparatus, there may be used potential step chronoamperometry, coulombmetry, cyclic voltammetry, etc.
In view of the above, the needle integrated biosensor in accordance with the present invention is able to cope with a universal plan where the users are not restricted.
Now each of the needle integrated biosensors in the embodiments according to the present invention will be illustrated in detail by referring to drawings and the present invention is not limited to the following examples so far as they are within a gist of the present invention.
c) shows the state where an adhesive layer 5C is formed on a resist layer. Since an adhesive layer 5C is also formed between the substrates 1C and 1C, it plays a role of a spacer 2C the same as the resist layer 6C.
When a connecting part such as perforation is formed between the substrates 1C and 1C, a biosensor as a molding 18C is assembled. Firstly, unlike a manufacture method by layering, the biosensor assembled by such a folding system does not need layering of substrates whereby there is an advantage that the manufacturing steps can be simplified. Accordingly, it is a method which is suitable for the production of a sensor which is formed with high precision in a large scale in a high yield. The connecting part 21C for the substrates which is necessary for the folded structure also acts as a hook 22C for fixing the shrinkable material 16C to the substrate as shown in
d) shows the state where a sample-conveying path and a piercing drive part 8 are shut out from the outer air by a shrinkable material 16 which is to tightly close the space among the puncture needle support 17C, the substrate 1C and the soft material 15C to the place near the opening 12C for piercing and collecting the blood. The shrinkable material 16C also covers the cutting part. The soft material is also helpful for a close adhesion of the skin of the person to be tested with the opening 12C for piercing and collecting the blood.
Although the present invention is illustrated in detail by referring to specific embodiments hereinabove, it is apparent for persons skilled in the art that various changes and modifications thereof are able to be done without departing the spirit and the scope of the present invention.
The present application is on the basis of a Japanese patent application (Application No. 2005-185988) filed on Jun. 27, 2005, a Japanese patent application (Application No. 2005-201072) filed on Jul. 11, 2005 and a Japanese patent application (Application No. 2005-218685) filed on July 28, and their contents are incorporated herein as references.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2005-185988 | Jun 2005 | JP | national |
| 2005-201072 | Jul 2005 | JP | national |
| 2005-218685 | Jul 2005 | JP | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/JP2006/312818 | 6/27/2006 | WO | 00 | 12/27/2007 |
