Biosensor
AssigneePanasonic Corporation
InventorsHiroyuki Tokunaga, Shoji Miyazaki, Eriko Yamanishi
Life of this patent
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Abstract
In a biosensor that detects introduction of a sample liquid into a specimen supply path using a detecting electrode, a means of improving accuracy of detection is provided. The biosensor has: an electrode system including measuring electrode, counter electrode, and detecting electrode on first electrically insulating support; specimen supply path for introducing the sample liquid; and reagent layer used for quantifying a substrate contained in the sample liquid. The means is characterized in that detecting electrode is spaced from measuring electrode by a distance sufficient for the sample liquid to sufficiently cover measuring electrode before the sample liquid reaches detecting electrode.
Claims14
A biosensor for quantifying a substrate contained in a sample liquid comprising:
- a first insulating support;
- a second insulating support;
- an electrode system having at least a measuring electrode, a counter electrode including a first portion and a second portion, and a detecting electrode;
- a spacer configured to define a specimen supply path for introducing the sample liquid over the electrode system;
- wherein the electrode system is arranged from a tip of the specimen supply path to a downstream portion of the specimen supply path in a following order:
- the first portion of the counter electrode, the measuring electrode, the second portion of the counter electrode and the detecting electrode;
- wherein the second insulating support has an air hole which is formed over a downstream portion of the detecting electrode;
- and
- wherein, in a planer view, a tip of the detecting electrode positioned within the specimen supply path has a V-shape and is covered by the second insulating support, and the downstream portion of the detecting electrode is exposed to the air hole.
A biosensor for quantifying a substrate contained in a sample liquid comprising:
- a first insulating support;
- a second insulating support;
- a plurality of electrodes disposed between the first insulating support and the second insulating support, the plurality of electrodes including at least a measuring electrode, a counter electrode including a first portion and a second portion, and a detecting electrode;
- a spacer disposed between the second insulating support and the plurality of electrodes, the spacer configured to define a specimen supply path for introducing the sample liquid over the plurality of electrodes from an upstream portion of the specimen supply path to a downstream portion of the specimen supply path;
- wherein the plurality of electrodes are arranged from the upstream portion of the specimen supply path to the downstream portion of the specimen supply path in a following order:
- the first portion of the counter electrode, the measuring electrode, the second portion of the counter electrode and the detecting electrode;
- wherein the second insulating support includes an air hole arranged over a first portion of the detecting electrode;
- and
- wherein, in a planer view, a second portion of the detecting electrode has a V-shape and is covered by the second insulating support, the second portion of the detecting electrode being disposed further upstream along the specimen supply path than the first portion of the detecting electrode.
Dependencies are inferred from the claim text.