Biosensor
First Claim
1. A biosensor comprising:
- an insulating base plate, an electrode system that is provided on the base plate and has at least a working electrode and a counter electrode, a cover member that is combined with the base plate to define a sample solution supply pathway for leading a sample solution from a sample supply unit to the electrode system, wherein the sample supply unit is located on a side of the electrode system, a reaction reagent system including at least an oxidation-reduction enzyme and an electron mediator, and a filter in the sample solution supply pathway, the filter disposed between the electrode system and the sample supply unit, the biosensor having a space that encircles the surface of the filter in an area located between a first end of the filter close to the sample supply unit and a second end of the filter close to the electrode system, wherein said space has a width of 0.5 mm to 5.0 mm.
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Accused Products
Abstract
The present invention provides a biosensor that enables highly-accurate measurement of a sample solution including a solid component like hemocytes and has a little variation in response. The biosensor includes: an insulating base plate, an electrode system having at least a working electrode and a counter electrode provided on the base plate, a cover member that is combined with the base plate to define a sample solution supply pathway for leading a sample solution from a sample supply unit to the electrode system, a reaction reagent system including at least an oxidation-reduction enzyme and an electron mediator, and a filter disposed between the electrode system and the sample supply unit in the sample solution supply pathway. The biosensor has a space that encircles surface of the filter in an area from one end of the filter close to the sample supply unit to the other end of the filter close to the electrode system. This arrangement effectively prevents the solid component like hemocytes from flowing into the electrode system without being filtered out by the filter.
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Citations
17 Claims
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1. A biosensor comprising:
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an insulating base plate, an electrode system that is provided on the base plate and has at least a working electrode and a counter electrode, a cover member that is combined with the base plate to define a sample solution supply pathway for leading a sample solution from a sample supply unit to the electrode system, wherein the sample supply unit is located on a side of the electrode system, a reaction reagent system including at least an oxidation-reduction enzyme and an electron mediator, and a filter in the sample solution supply pathway, the filter disposed between the electrode system and the sample supply unit, the biosensor having a space that encircles the surface of the filter in an area located between a first end of the filter close to the sample supply unit and a second end of the filter close to the electrode system, wherein said space has a width of 0.5 mm to 5.0 mm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A biosensor comprising:
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an insulating base plate, an electrode system that is provided on the base plate and has at least a working electrode and a counter electrode, a cover member that is combined with the base plate to define a sample solution supply pathway for leading a sample solution from a sample supply unit to the electrode system, wherein the sample solution supply pathway is disposed in a direction of gravity from the sample supply unit provided on the cover member, a reaction reagent system including at least an oxidation-reduction enzyme and an electron mediator, and a filter in the sample solution supply pathway, the filter disposed between the electrode system and the sample supply unit, the biosensor having a space that encircles the surface of the filter in an area located between a first end of the filter close to the sample supply unit and a second end of the filter close to the electrode system, wherein the width of the space is not less that 100 μ
m and is smaller than the thickness of the filter.- View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification