Method and apparatus for in vivo determination of the concentration in a body fluid of metabolically significant substances
First Claim
1. A method for in vivo determination of a body fluid'"'"'s concentration of at least one metabolically significant substance, the method comprising the steps of:
- (a) temporarily inserting a needle for a short duration of time, the needle being stored and having a sensor, into the tissue of a person whose body fluid shall be analyzed;
(b) recording an output signal from the sensor;
(c) withdrawing the needle and(d) calculating the concentration of the metabolically significant substance by extrapolation of the recorded output signal.
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Abstract
A method for in vivo determination of the concentration in a body fluid of metabolically significant substance comprises storing of a needle with a sensor in a liquid-filled ampoule, brief insertion of the needle into a patient, recording of the output signal from the sensor, withdrawal of the needle, and calculation of the concentration looked for on the basis of the recorded signals. The method is preformed using an apparatus comprising a needle (5) with a sensor (6), an ampoule (1) containing a solution (2) and closed by two membranes (3, 4). The needle (5) is stored with its sensor (6) in the solution. The apparatus further comprises a mechanical unit for driving the needle (5) to protrude from the ampoule for a set moment, and an electronic unit storing the output signal from the sensor (6) and performing calculations on the basis of the stored signal values. The needle with its sensor (6) and the ampoule with the solution (2) are independent disposable parts mounted in a durable part containing the mechanical and electronic parts.
572 Citations
12 Claims
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1. A method for in vivo determination of a body fluid'"'"'s concentration of at least one metabolically significant substance, the method comprising the steps of:
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(a) temporarily inserting a needle for a short duration of time, the needle being stored and having a sensor, into the tissue of a person whose body fluid shall be analyzed; (b) recording an output signal from the sensor; (c) withdrawing the needle and (d) calculating the concentration of the metabolically significant substance by extrapolation of the recorded output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification