ANALYTE MEASUREMENT METER OR SYSTEM INCORPORATING AN IMPROVED MEASUREMENT CIRCUIT
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Accused Products
Abstract
Many aspects of the invention will be apparent from the following paragraphs and detailed description some of which are as follows. In one example, the invention includes a circuit for measuring an analyte or indicator in a body fluid sample including a reference voltage circuit, at least one measurement line, a result line, a buffering circuit between the voltage reference circuit and the measurement line wherein the buffering circuit comprises at least one operational amplifier the output of which is connected to the result line. The circuit may be a glucose concentration measurement circuit delivering the glucose concentration in a body fluid such as for example blood, plasma, interstitial fluid, urine. The circuit may further form part of a meter or system for measuring glucose concentration in a body fluid.
24 Citations
21 Claims
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1-3. -3. (canceled)
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4. A circuit for analyte measurement in a biological fluid sample, the circuit comprising:
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a test strip connector having a measurement line configured to be connected to a working electrode of a test strip and a reference line configured to be connected to a reference electrode of the test strip to a ground; and an operational amplifier provided with a line voltage from a voltage reference circuit to provide a reference voltage to the working electrode of a test strip without loading the voltage reference circuit, and the output of the operational amplifier is configured to compensate for any current drawn by an electrochemical cell formed by the working electrode and reference electrode. - View Dependent Claims (7)
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5. A circuit for analyte measurement in a biological fluid sample, the circuit comprising:
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a test strip connector having a measurement line configured to be connected to a working electrode of a test strip and a reference line configured to be connected to a reference electrode of the test strip to a ground; and an operational amplifier having a first input connected to a voltage reference circuit and a second input connected to both the working electrode and to an output of the operational amplifier via a feedback resistor. - View Dependent Claims (6, 8, 9, 10, 12)
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11. A circuit for analyte measurement in a biological fluid sample, the circuit comprising:
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a test strip connector having a measurement line configured to be connected to a working electrode of a test strip and a reference line configured to be connected to a reference electrode of the test strip to a ground; and an operational amplifier having first and second inputs and an output, the first input provided with a line voltage and the second input connected to the working electrode to the measurement line, a feedback resistor, and the output so that the output provides a voltage indicative of a current drawn by an electrochemical cell formed by the working electrode and the reference electrode.
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13. A system to determine analyte concentration in a biological fluid sample, the system comprising:
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a test strip connector having a measurement line configured to be connected to a working electrode of a test strip and a reference line configured to be connected to a reference electrode of the test strip, the reference line also being connected to a ground; a voltage reference circuit that provides a line voltage; a buffer circuit connected to the reference circuit to provide a reference voltage substantially equal to the line voltage to the measurement line without loading the voltage reference circuit, the buffer circuit having an output connected to the measurement line via a feedback resistor; and a processing circuit connected to the output of the buffer circuit so as to provide a voltage indicative of the current drawn from an electrochemical cell when such cell is formed by the working electrode and reference electrode of the test strip in the presence of a fluid sample. - View Dependent Claims (14, 15, 16, 17)
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18. A method of measuring analyte concentration in a biological fluid sample, the method comprising:
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providing a test strip having a working electrode and a reference electrode; connecting the reference electrode to a ground; depositing a fluid sample across the electrodes; supplying a reference voltage substantially equal to a line voltage of an electrical power source to the working electrode in which the reference voltage is independent of a load on the electrical power source; and measuring a change in current between the working electrode and the reference electrode generated by the reference voltage, the change in current being indicative of an analyte concentration in the biological fluid sample. - View Dependent Claims (19, 20, 21)
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Specification