CA2132380A1 - Measuring device for removable sensors - Google Patents
Measuring device for removable sensorsInfo
- Publication number
- CA2132380A1 CA2132380A1 CA002132380A CA2132380A CA2132380A1 CA 2132380 A1 CA2132380 A1 CA 2132380A1 CA 002132380 A CA002132380 A CA 002132380A CA 2132380 A CA2132380 A CA 2132380A CA 2132380 A1 CA2132380 A1 CA 2132380A1
- Authority
- CA
- Canada
- Prior art keywords
- measuring device
- contact
- removable sensor
- value
- electric current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/001—Enzyme electrodes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/483—Physical analysis of biological material
- G01N33/487—Physical analysis of biological material of liquid biological material
- G01N33/48785—Electrical and electronic details of measuring devices for physical analysis of liquid biological material not specific to a particular test method, e.g. user interface or power supply
Abstract
ABSTRACT
The present invention concerns a measuring device, notably for measuring the level of glucose in blood, intended to be used with a removable sensor comprising at least one active zone. In particular, the invention concerns the electrical connection between the measuring device and the removable sensor. Each electrical contact surface of the removable sensor is connected to two electrical contact organs to enable the condition of the electrical contacts between these electrical contact organs and the corresponding contact surfaces to be checked before a measurement is carried out.
The present invention concerns a measuring device, notably for measuring the level of glucose in blood, intended to be used with a removable sensor comprising at least one active zone. In particular, the invention concerns the electrical connection between the measuring device and the removable sensor. Each electrical contact surface of the removable sensor is connected to two electrical contact organs to enable the condition of the electrical contacts between these electrical contact organs and the corresponding contact surfaces to be checked before a measurement is carried out.
Description
~--` 2132380 Case 1109 MEASURING DEVICE FOR REMOVABLE SENSORS
The present invention concerns a measuring device intended to be used with a removable sensor. For example, such a measuring device is used to carry out measurement of the electrochemical type, in particular to measure the glucose level in blood. The electrochemical functioning of such a measurement is described for example in patent application WO 92/14 836.
More particularly, the present invention concerns the electrical connection between such a measuring device and a removable sensor used with this measuring device.
Figure 1 shows a schematical general view of a measuring device, designated by the general reference 2, and a removable sensor designated by the reference 4.
Removable sensor 4 comprises an active zone 6 and two contact surfaces 8 and 10 electrically connected to active zone 6 via two conductors which are not shown.
Figure 2 shows a schematical view of a conventional electrical connection between a measuring device (partially shown) and a removable sensor of the type shown in figure 1.
The electrical connection is realised by two metallic strips connected respectively to the two contact surfaces 8 and 10, the latter being electrically connected in series to active zone 6 of removable sensor 4.
In order to enable removable sensor 4 to be introduced into the measuring device or to be withdrawn from the latter, the electrical connection is ensured only by pressure from metallic strips 12 and 14 on ithe respective contact surfaces 8 and 10, these strips 12 and 14 ~
exhibiting a certain elasticity. ~ -The electrical connection arrangement described above is not very reliable. Indeed, it can easily happen that one of the metallic strips becomes distorted following the ~. . , ~.~ ,..
''. . ~
~132380 repeated introduction of removable sensors or that the pressure exercised by the metallic strip is insufficient to establish a proper electrical connection. Further, removable sensor 4 may be defective and the contact surfaces may have, for example, an abnormal electrical resistance.
The different problems cited above are especially disastrous for measurements of a medical nature.
A purpose of the present invention is to overcome the lack of security of the electrical connection between a measuring device and a removable sensor intended to be used with this measuring device.
The present invention therefore concerns a measuring device intended to be used with a removable sensor having at least two electrical contact surfaces, this measuring device comprising measuring means and connection means comprising at least two first contact means. These two first contact means are used respectively to establish an electrical connection between the two contact surfaces of said removable sensor and the measuring means. This measuring device is characterised in that said connection means also comprises two second contact means, the two second contact means being used respectively to connect electrically the two contact surfaces of said removable sensor to testing means enabling said electrical connection between each of the two first contact surfaces and said measuring means to be tested.
The doubling of contact means according to the invention between the measuring device and the removable sensor with which it is used enables, according to different embodiments, at least one electric circuit to be established, not including the active zone of the removable sensor and enables one to test whether the electrical connection bet~een the first contact means and the respective contact surfaces of said removable sensor is correctly established, to the extend that the electrical connection between the second contact means and 3 2l3238o the respective electrical contact surfaces of said removable sensor is also correctly established.
It is therefore possible, before carrying out a measurement by the intermediary of the measuring device and the removable sensor with which it is used, to ensure that the establishment of an electrical connection between each of the first or second contact means intervening in the measurement and the removable sensor is correctly established.
According to another characteristic of the invention, it is also possible to test whether the sensor used for measuring is defective.
Other advantages and characteristics of the invention will become clear with the help of the following description made with reference to the attached drawings, given purely by way of a non-limitative example, in which :
- figure 1, already described, shows in perspective a general view of a measuring device and a removable sensor with which it is used;
- figure 2, already described, is a partial view of a measuring device of the prior art schematically showing the electrical connection between the measuring device and a removable sensor with which it is used;
- figure 3 shows in perspective a schematical view of a measuring device according to the invention used with a removable sensor;
- figure 4 shows a schematical view of a first embodiment of the electric circuit of the measuring device according to the invention.
- figure 5 shows a schematical view of a second embodiment of the electric circuit of the measuring device according to the invention.
In figure 3, the measuring device according to the invention, designated by the general reference 20, is used with a removable sensor 4 comprising at least an active zone 6 and two electrical contact surfaces 8 and 10. These 42l32380 electrical contact surfaces 8 and 10 are electrically insulated from each other and are electrically connected to active zone 6 by means of two respective conductors (not shown) integrated into removable sensor 4.
Measuring device 20 includes connection means 22 formed by four electrical contacts 24, 25, 26 and 27, consisting respectively of four metallic strips or wires.
These four metallic strips 24 to 27, used as electrical contact means between measuring device 20 and removable sensor 4, are bent and exhibit a certain elasticity enabling them to rest on electrical contact surfaces 8 and 10 of removable sensor 4, that is to say, to exercise a certain contact pressure on said electrical contact surfaces 8 and 10.
Thus, each of two electrical contact surfaces 8 and 10 is used with two electrical contacts 24 and 26, 25 and 27, independent of each other. This doubling of electrical contacts by electrical contact surface enables the electrical connection between removable sensor 4 and measuring device 20 to be tested by means of an electric or electronic circuit arranged in said measuring device.
Two embodiments of this electric circuit of measuring device 20 according to the invention will be described below.
In figure 4 a first embodiment of the electric circuit of a measuring device according to the invention is shown.
Figure 4 shows a schematical diagram of two electrical contact surfaces 8 and 10 of a removable sensor and the four electrical contacts 24, 25, 26 and 27 of a measuring device according to the invention which are used with them.
It should be noted here that the removable sensor is a multiple zone sensor comprising a plurality of active zones 6a, 6b, 6c, electrically connected in parallel to two electrical contact surfaces 8 and 10, there being any number of these actives zones. The electric circuit of the measuring device according to the invention comprises measuring means 30 and testing means comprising a testing electronic unit 32 and testing resistor 34. It will be noted that measuring means 30 and testing electronic unit 32 may be formed by one and the same electronic unit.
Electrical contacts 24 and 27 used respectively with contact surfaces 8 and 10 are connected to measuring means 30. On the other hand, electrical contacts 25 and 26 used respectively with electrical contact surfaces 8 and 10 are connected to testing resistor 34. In this embodiment, the value of the electrical resistance of active zones 6a, 6b and 6c, when these active zones are not in contact with a substance which is electrically conductive in conjunction with one of said active zones, is very high, more particularly almost infinite.
In order to be able to test whether the electrical connections between electrical contact 24 and contact surface 8 and between electrical contact 27 and contact surface 10 are correctly established, electrical contacts 24 and 27 are capable of being electrically connected to a voltage source (not shown) which is part of measuring means 30 and/or testing electronic unit 32. It is envisaged that testing resistor 34 has a value enabling an electric test current IC to be established when electrical contacts 24 and 27 are connected to said voltage supply.
Testing resistor 34 has, for example, a value of the order of several tens of KQ~ in particular 30 KQ.
It is advantageous for the voltage source used to establish an electric test current IC to be a constant voltage supply. Thus, knowing the value of testing resistor 34, it is possible to determine the minimal value of an electric test current IC required to flow through testing resistor 34 when the electrical connection between four electrical contacts 24, 25, 26 and 27 and two electrical contact surfaces 8 and 10 is correctly established.
21,~2380 In order to test whether said minimal value is achieve during a testing phase, namely a phase in which active zones 6a, 6b and 6c are not in contact with any substance which is electrically conductive in conjunction with one of the active zones, testing means 32 comprises means for comparing (not shown) the value of electric test current IC to a first reference value approximately equal to said minimal value.
In an alternative of this first embodiment, test current IC may be stored, the value of this test current IC being taken into consideration by measuring means 30 at the time of measuring a substance to be analysed by means of at least one of active zones 6a, 6b and 6c of the removable sensor used with the measuring device according to this first embodiment of the invention.
It will also be noted that the resistance of testing resistor 34, electrically connected in parallel with active zones 6a, 6b and 6c to measuring means 30, is to be taken into consideration in the arrangement of measuring means 30. For the sensitivity of the measuring device arranged according to this first embodiment to be high, it is preferable that the electrical resistance of each of active zones 6a, 6b and 6c, when placed in contact with a substance to be analysed, has a value less than the value of testing resistor 34, for example, ten times smaller.
In another alternative of this first embodiment, said means for comparing also enables the value of test current IC to be compared to a second reference value. The removable sensor used with the measuring device according to this alternative, is considered to be defective when the value of test current IC is greater than this second reference value. This comparison notably enables a defect in one of active zones 6a, 6b or 6c or a short-circuit intervening in t.he removable sensor to be detected.
Thus, during a testing phase prior to a measurement, the measuring device used with a removable sensor is judged to be in a correct operating condition when the ~ . .
. ~:
~ ~ ,.
value of test current IC is included between the first reference value and the second reference value. To this end, the testing means of the measuring device according to the invention is arranged to indicate that this measuring device used with a removable sensor introduced into the latter is not functioning when the value of the test current is less than said first reference value or greater than said second reference value.
Referring to figure 5, a second embodiment of the electric circuit of a measuring device according to the invention will be described below.
In figure 5 two electrical contact surfaces 8 and 10 of a removable sensor and active zone 6 of this removable sensor are also shown.
Each of two electrical contact surfaces 8 and 10 is also used with two electrical contacts 24 and 26, 25 and 27 belonging to the measuring device. This measuring device also comprises measuring means 40 and testing means comprising a testing electronic unit 42 and two switches 44 and 46. Each of two switches 44 and 46 may be actuated independently of each other by testing electronic unit 42.
The two switches 44 and 46 are electrically connected to measuring means 40, each of these two switches 44 and 46 being capable of switching between a first terminal 48, 49 and a second terminal 50, 51.
The two terminals 48 and 50 of switch 44 are connected respectively to electrical contacts 24 and 25, which are respectively used with the two electrical contact surfaces 8 and 10 of the removable sensor.
Similarly, the two terminals 49 and 51 of switch 46 are respectively connected to the two electrical contacts 26 and 27, which are respectively used with the two electrical contact surfaces 8 and 10. Measuring means 40 and/or testing electronic unit 42 comprise a voltage source (not shown) capable of being connected in series to the two switches 44 and 46.
This second embodiment of the invention enables the electrical connection of electrical contacts 24 and 26 used with contact surface 8 and the electrical connection of electrical contacts 25 and 27 used with electrical contact surface 10 to be checked separately.
When switches 44 and 46 are connected respectively to terminals 48 and 49, it is possible to test whether an electric test current flows between electrical contacts 24 and 26 when the two switches 44 and 46 are connected in series to said voltage source. Similarly, when the two switches 44 and 46 are connected respectively to terminals 50 and 51, it is possible to test whether the electrical connection between electrical contacts 25 and 27 and electrical contact surface 10 is correctly established.
Thus, it is possible to test independently the state of the electrical connections of each of the two electrical contact surfaces 8 and 10. Further, this second embodiment of the invention enables the electrical connection between the removable sensor and the measuring device to be tested without the resistance of active zone 6 to the passage of an electric current or the state of active zone 6 having an effect on the test carried out.
Also, testing electronic unit 42 comprises means for comparing enabling the value of an electric test current flowing either between electrical contacts 24 and 26, or between electrical contacts 25 and 27 to be compared to a first reference value corresponding to a minimal current below which the electrical connection is considered to be incorrectly established.
This second embodiment also enables the state of active zone 6 to be tested by switching switch 44 onto terminal 48 and switch 46 onto terminal 51 or by switching switch 44 onto terminal 50 and switch 46 onto terminal 49.
It is thus possible to test that the resistance of active zone 6 of the removable sensor to the flow of an electric current, when active zone 6 is not in contact with any substance which is electrically conductive in conjunction ,, ~, ;, with this active zone, is not less than a determined value.
To achieve the latter test, comparing means of ~ -testing electronic unit 42 enables the value of an electric test current capable of flowing through active zone 6 to be compared to a second reference value. When the latter electric control current has a value less than this second reference value, the removable sensor is considered to be defective. This defectiveness may arise for example from the active zone itself or from a short-circuit between the two conductors 54 and 56 electrically connecting active zone 6 to contact surfaces 8 and 10.
Finally, it will be noted that the second embodiment of the invention is also suitable for multiple zone removable sensors, just as the first embodiment described in figure 4 is suitable for single-zone removable sensors.
.
The present invention concerns a measuring device intended to be used with a removable sensor. For example, such a measuring device is used to carry out measurement of the electrochemical type, in particular to measure the glucose level in blood. The electrochemical functioning of such a measurement is described for example in patent application WO 92/14 836.
More particularly, the present invention concerns the electrical connection between such a measuring device and a removable sensor used with this measuring device.
Figure 1 shows a schematical general view of a measuring device, designated by the general reference 2, and a removable sensor designated by the reference 4.
Removable sensor 4 comprises an active zone 6 and two contact surfaces 8 and 10 electrically connected to active zone 6 via two conductors which are not shown.
Figure 2 shows a schematical view of a conventional electrical connection between a measuring device (partially shown) and a removable sensor of the type shown in figure 1.
The electrical connection is realised by two metallic strips connected respectively to the two contact surfaces 8 and 10, the latter being electrically connected in series to active zone 6 of removable sensor 4.
In order to enable removable sensor 4 to be introduced into the measuring device or to be withdrawn from the latter, the electrical connection is ensured only by pressure from metallic strips 12 and 14 on ithe respective contact surfaces 8 and 10, these strips 12 and 14 ~
exhibiting a certain elasticity. ~ -The electrical connection arrangement described above is not very reliable. Indeed, it can easily happen that one of the metallic strips becomes distorted following the ~. . , ~.~ ,..
''. . ~
~132380 repeated introduction of removable sensors or that the pressure exercised by the metallic strip is insufficient to establish a proper electrical connection. Further, removable sensor 4 may be defective and the contact surfaces may have, for example, an abnormal electrical resistance.
The different problems cited above are especially disastrous for measurements of a medical nature.
A purpose of the present invention is to overcome the lack of security of the electrical connection between a measuring device and a removable sensor intended to be used with this measuring device.
The present invention therefore concerns a measuring device intended to be used with a removable sensor having at least two electrical contact surfaces, this measuring device comprising measuring means and connection means comprising at least two first contact means. These two first contact means are used respectively to establish an electrical connection between the two contact surfaces of said removable sensor and the measuring means. This measuring device is characterised in that said connection means also comprises two second contact means, the two second contact means being used respectively to connect electrically the two contact surfaces of said removable sensor to testing means enabling said electrical connection between each of the two first contact surfaces and said measuring means to be tested.
The doubling of contact means according to the invention between the measuring device and the removable sensor with which it is used enables, according to different embodiments, at least one electric circuit to be established, not including the active zone of the removable sensor and enables one to test whether the electrical connection bet~een the first contact means and the respective contact surfaces of said removable sensor is correctly established, to the extend that the electrical connection between the second contact means and 3 2l3238o the respective electrical contact surfaces of said removable sensor is also correctly established.
It is therefore possible, before carrying out a measurement by the intermediary of the measuring device and the removable sensor with which it is used, to ensure that the establishment of an electrical connection between each of the first or second contact means intervening in the measurement and the removable sensor is correctly established.
According to another characteristic of the invention, it is also possible to test whether the sensor used for measuring is defective.
Other advantages and characteristics of the invention will become clear with the help of the following description made with reference to the attached drawings, given purely by way of a non-limitative example, in which :
- figure 1, already described, shows in perspective a general view of a measuring device and a removable sensor with which it is used;
- figure 2, already described, is a partial view of a measuring device of the prior art schematically showing the electrical connection between the measuring device and a removable sensor with which it is used;
- figure 3 shows in perspective a schematical view of a measuring device according to the invention used with a removable sensor;
- figure 4 shows a schematical view of a first embodiment of the electric circuit of the measuring device according to the invention.
- figure 5 shows a schematical view of a second embodiment of the electric circuit of the measuring device according to the invention.
In figure 3, the measuring device according to the invention, designated by the general reference 20, is used with a removable sensor 4 comprising at least an active zone 6 and two electrical contact surfaces 8 and 10. These 42l32380 electrical contact surfaces 8 and 10 are electrically insulated from each other and are electrically connected to active zone 6 by means of two respective conductors (not shown) integrated into removable sensor 4.
Measuring device 20 includes connection means 22 formed by four electrical contacts 24, 25, 26 and 27, consisting respectively of four metallic strips or wires.
These four metallic strips 24 to 27, used as electrical contact means between measuring device 20 and removable sensor 4, are bent and exhibit a certain elasticity enabling them to rest on electrical contact surfaces 8 and 10 of removable sensor 4, that is to say, to exercise a certain contact pressure on said electrical contact surfaces 8 and 10.
Thus, each of two electrical contact surfaces 8 and 10 is used with two electrical contacts 24 and 26, 25 and 27, independent of each other. This doubling of electrical contacts by electrical contact surface enables the electrical connection between removable sensor 4 and measuring device 20 to be tested by means of an electric or electronic circuit arranged in said measuring device.
Two embodiments of this electric circuit of measuring device 20 according to the invention will be described below.
In figure 4 a first embodiment of the electric circuit of a measuring device according to the invention is shown.
Figure 4 shows a schematical diagram of two electrical contact surfaces 8 and 10 of a removable sensor and the four electrical contacts 24, 25, 26 and 27 of a measuring device according to the invention which are used with them.
It should be noted here that the removable sensor is a multiple zone sensor comprising a plurality of active zones 6a, 6b, 6c, electrically connected in parallel to two electrical contact surfaces 8 and 10, there being any number of these actives zones. The electric circuit of the measuring device according to the invention comprises measuring means 30 and testing means comprising a testing electronic unit 32 and testing resistor 34. It will be noted that measuring means 30 and testing electronic unit 32 may be formed by one and the same electronic unit.
Electrical contacts 24 and 27 used respectively with contact surfaces 8 and 10 are connected to measuring means 30. On the other hand, electrical contacts 25 and 26 used respectively with electrical contact surfaces 8 and 10 are connected to testing resistor 34. In this embodiment, the value of the electrical resistance of active zones 6a, 6b and 6c, when these active zones are not in contact with a substance which is electrically conductive in conjunction with one of said active zones, is very high, more particularly almost infinite.
In order to be able to test whether the electrical connections between electrical contact 24 and contact surface 8 and between electrical contact 27 and contact surface 10 are correctly established, electrical contacts 24 and 27 are capable of being electrically connected to a voltage source (not shown) which is part of measuring means 30 and/or testing electronic unit 32. It is envisaged that testing resistor 34 has a value enabling an electric test current IC to be established when electrical contacts 24 and 27 are connected to said voltage supply.
Testing resistor 34 has, for example, a value of the order of several tens of KQ~ in particular 30 KQ.
It is advantageous for the voltage source used to establish an electric test current IC to be a constant voltage supply. Thus, knowing the value of testing resistor 34, it is possible to determine the minimal value of an electric test current IC required to flow through testing resistor 34 when the electrical connection between four electrical contacts 24, 25, 26 and 27 and two electrical contact surfaces 8 and 10 is correctly established.
21,~2380 In order to test whether said minimal value is achieve during a testing phase, namely a phase in which active zones 6a, 6b and 6c are not in contact with any substance which is electrically conductive in conjunction with one of the active zones, testing means 32 comprises means for comparing (not shown) the value of electric test current IC to a first reference value approximately equal to said minimal value.
In an alternative of this first embodiment, test current IC may be stored, the value of this test current IC being taken into consideration by measuring means 30 at the time of measuring a substance to be analysed by means of at least one of active zones 6a, 6b and 6c of the removable sensor used with the measuring device according to this first embodiment of the invention.
It will also be noted that the resistance of testing resistor 34, electrically connected in parallel with active zones 6a, 6b and 6c to measuring means 30, is to be taken into consideration in the arrangement of measuring means 30. For the sensitivity of the measuring device arranged according to this first embodiment to be high, it is preferable that the electrical resistance of each of active zones 6a, 6b and 6c, when placed in contact with a substance to be analysed, has a value less than the value of testing resistor 34, for example, ten times smaller.
In another alternative of this first embodiment, said means for comparing also enables the value of test current IC to be compared to a second reference value. The removable sensor used with the measuring device according to this alternative, is considered to be defective when the value of test current IC is greater than this second reference value. This comparison notably enables a defect in one of active zones 6a, 6b or 6c or a short-circuit intervening in t.he removable sensor to be detected.
Thus, during a testing phase prior to a measurement, the measuring device used with a removable sensor is judged to be in a correct operating condition when the ~ . .
. ~:
~ ~ ,.
value of test current IC is included between the first reference value and the second reference value. To this end, the testing means of the measuring device according to the invention is arranged to indicate that this measuring device used with a removable sensor introduced into the latter is not functioning when the value of the test current is less than said first reference value or greater than said second reference value.
Referring to figure 5, a second embodiment of the electric circuit of a measuring device according to the invention will be described below.
In figure 5 two electrical contact surfaces 8 and 10 of a removable sensor and active zone 6 of this removable sensor are also shown.
Each of two electrical contact surfaces 8 and 10 is also used with two electrical contacts 24 and 26, 25 and 27 belonging to the measuring device. This measuring device also comprises measuring means 40 and testing means comprising a testing electronic unit 42 and two switches 44 and 46. Each of two switches 44 and 46 may be actuated independently of each other by testing electronic unit 42.
The two switches 44 and 46 are electrically connected to measuring means 40, each of these two switches 44 and 46 being capable of switching between a first terminal 48, 49 and a second terminal 50, 51.
The two terminals 48 and 50 of switch 44 are connected respectively to electrical contacts 24 and 25, which are respectively used with the two electrical contact surfaces 8 and 10 of the removable sensor.
Similarly, the two terminals 49 and 51 of switch 46 are respectively connected to the two electrical contacts 26 and 27, which are respectively used with the two electrical contact surfaces 8 and 10. Measuring means 40 and/or testing electronic unit 42 comprise a voltage source (not shown) capable of being connected in series to the two switches 44 and 46.
This second embodiment of the invention enables the electrical connection of electrical contacts 24 and 26 used with contact surface 8 and the electrical connection of electrical contacts 25 and 27 used with electrical contact surface 10 to be checked separately.
When switches 44 and 46 are connected respectively to terminals 48 and 49, it is possible to test whether an electric test current flows between electrical contacts 24 and 26 when the two switches 44 and 46 are connected in series to said voltage source. Similarly, when the two switches 44 and 46 are connected respectively to terminals 50 and 51, it is possible to test whether the electrical connection between electrical contacts 25 and 27 and electrical contact surface 10 is correctly established.
Thus, it is possible to test independently the state of the electrical connections of each of the two electrical contact surfaces 8 and 10. Further, this second embodiment of the invention enables the electrical connection between the removable sensor and the measuring device to be tested without the resistance of active zone 6 to the passage of an electric current or the state of active zone 6 having an effect on the test carried out.
Also, testing electronic unit 42 comprises means for comparing enabling the value of an electric test current flowing either between electrical contacts 24 and 26, or between electrical contacts 25 and 27 to be compared to a first reference value corresponding to a minimal current below which the electrical connection is considered to be incorrectly established.
This second embodiment also enables the state of active zone 6 to be tested by switching switch 44 onto terminal 48 and switch 46 onto terminal 51 or by switching switch 44 onto terminal 50 and switch 46 onto terminal 49.
It is thus possible to test that the resistance of active zone 6 of the removable sensor to the flow of an electric current, when active zone 6 is not in contact with any substance which is electrically conductive in conjunction ,, ~, ;, with this active zone, is not less than a determined value.
To achieve the latter test, comparing means of ~ -testing electronic unit 42 enables the value of an electric test current capable of flowing through active zone 6 to be compared to a second reference value. When the latter electric control current has a value less than this second reference value, the removable sensor is considered to be defective. This defectiveness may arise for example from the active zone itself or from a short-circuit between the two conductors 54 and 56 electrically connecting active zone 6 to contact surfaces 8 and 10.
Finally, it will be noted that the second embodiment of the invention is also suitable for multiple zone removable sensors, just as the first embodiment described in figure 4 is suitable for single-zone removable sensors.
.
Claims (6)
1. Measuring device intended to be used with a removable sensor, having at least two electrical contact surfaces, and comprising measuring means and connecting means comprising at least two first contact means, these two first contact means being used respectively to establish an electrical connection between said two contact surfaces of said removable sensor and said measuring means, said connecting means also comprising at least two second contact means, these two second contact means being used respectively to connect electrically said two contact surfaces of said removable sensor to testing means enabling said electrical connection between each of said first contact surfaces and said measuring means to be tested.
2. Measuring device according to claim 1 wherein said measuring means comprises a voltage source intended to be electrically connected in series to said two first contact means and enabling an electric current capable of flowing between these two first contact means to be measured, said testing means comprising an electrical testing resistor electrically connected in series with said two second contact means and comparing means enabling the value of said electric current to be compared to a first reference value, said testing means being arranged to indicate that said measuring device used with said removable sensor is not functioning when said value of said electric current is less than said first reference value.
3. Measuring device according to claim 2 wherein said removable sensor comprises at least one active zone intended to be placed in contact with a substance to be analysed and electrically connected in series with the two contact surfaces, this active zone having a high resistance to the flow of an electric current between the two contact surfaces when this active zone is not in contact with any substance which is electrically conductive in conjunction with said active zone, said comparing means enabling the value of said electric current to be compared to a second reference value, said testing means being arranged to indicate that said measuring device used with said removable sensor is not functioning when said value of said electric current is greater than said second reference value.
4. Measuring device according to claim 1 wherein said testing means comprises a first switch capable of switching between a first terminal and a second terminal and a second switch capable of switching between a third terminal and a fourth terminal, said first and third terminals being connected respectively to said two first contact means, said second and fourth terminals being connected respectively to said two second contact means, said measuring means comprising a voltage supply intended to be electrically connected in series to said first and second switches and enabling an electric current capable of flowing between these first and second switches to be measured, said testing means enabling said first and second switches to be activated independently and comprising comparing means enabling the value of said electric current to be compared to a first reference value, this testing means being arranged to indicate that said measuring device used with said removable sensor is not functioning when said value of said electric current is less than said first reference value.
5. Measuring device according to claim 4 wherein said removable sensor comprises at least one active zone intended to be placed in contact with a substance to be analysed and electrically connected in series to said two contact surfaces, said active zone having a high resistance to the flow of an electric current between the two contact surfaces when this active zone is not in contact with any substance which is electrically conductive in conjunction with this active zone, said comparing means enabling the value of said electric current to be compared to a second reference value, said testing means being arranged to indicate that said measuring device used with said removable sensor is not functioning when said value of said electric current is greater than said second reference value.
6. Measuring device according to claim 1 wherein this measuring device and said removable sensor with which it is used are arranged to measure glucose levels in blood.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9311318A FR2710413B1 (en) | 1993-09-21 | 1993-09-21 | Measuring device for removable sensors. |
| FR9311318 | 1993-09-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2132380A1 true CA2132380A1 (en) | 1995-03-22 |
Family
ID=9451150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002132380A Abandoned CA2132380A1 (en) | 1993-09-21 | 1994-09-19 | Measuring device for removable sensors |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US5502396A (en) |
| EP (1) | EP0645626B1 (en) |
| JP (1) | JP3647904B2 (en) |
| AU (1) | AU679768B2 (en) |
| CA (1) | CA2132380A1 (en) |
| DE (1) | DE69424612T2 (en) |
| DK (1) | DK0645626T3 (en) |
| ES (1) | ES2148260T3 (en) |
| FR (1) | FR2710413B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| DE69025134T2 (en) * | 1989-11-24 | 1996-08-14 | Matsushita Electric Ind Co Ltd | Method of manufacturing a biosensor |
| DE4123348A1 (en) * | 1991-07-15 | 1993-01-21 | Boehringer Mannheim Gmbh | ELECTROCHEMICAL ANALYSIS SYSTEM |
| AU2508292A (en) * | 1991-08-27 | 1993-03-16 | Porton Diagnostics, Inc. | Analyzer circuitry for analyzing samples on ion sensitive electrodes |
| FR2701117B1 (en) * | 1993-02-04 | 1995-03-10 | Asulab Sa | Electrochemical measurement system with multizone sensor, and its application to glucose measurement. |
| US5366609A (en) * | 1993-06-08 | 1994-11-22 | Boehringer Mannheim Corporation | Biosensing meter with pluggable memory key |
-
1993
- 1993-09-21 FR FR9311318A patent/FR2710413B1/en not_active Expired - Lifetime
-
1994
- 1994-09-05 JP JP21097894A patent/JP3647904B2/en not_active Expired - Fee Related
- 1994-09-14 DK DK94114427T patent/DK0645626T3/en active
- 1994-09-14 DE DE69424612T patent/DE69424612T2/en not_active Expired - Lifetime
- 1994-09-14 ES ES94114427T patent/ES2148260T3/en not_active Expired - Lifetime
- 1994-09-14 EP EP94114427A patent/EP0645626B1/en not_active Expired - Lifetime
- 1994-09-19 AU AU73033/94A patent/AU679768B2/en not_active Ceased
- 1994-09-19 CA CA002132380A patent/CA2132380A1/en not_active Abandoned
- 1994-09-21 US US08/309,778 patent/US5502396A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014083858A1 (en) * | 2012-11-28 | 2014-06-05 | パナソニック株式会社 | Biological information measuring device, bio sensor system, and error detection method for biological information measuring device |
Also Published As
| Publication number | Publication date |
|---|---|
| AU7303394A (en) | 1995-04-06 |
| US5502396A (en) | 1996-03-26 |
| EP0645626B1 (en) | 2000-05-24 |
| DK0645626T3 (en) | 2000-10-09 |
| FR2710413A1 (en) | 1995-03-31 |
| AU679768B2 (en) | 1997-07-10 |
| JPH07167812A (en) | 1995-07-04 |
| EP0645626A1 (en) | 1995-03-29 |
| FR2710413B1 (en) | 1995-11-03 |
| DE69424612D1 (en) | 2000-06-29 |
| JP3647904B2 (en) | 2005-05-18 |
| DE69424612T2 (en) | 2001-01-25 |
| ES2148260T3 (en) | 2000-10-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |