Biosensor
First Claim
1. A biosensor being provided with a suction cavity which sucks a certain amount of sample by means of capillary phenomenon, said biosensor comprising:
- a flow channel to connect said suction cavity and an analytical cavity furnished with a reagent, anda wall portion formed by projecting at least any one of an upper surface, a lower surface, and side walls of said flow channel, said wall portion provided on a part of said flow channel to form a narrowed section, said narrowed section is provided with a gap formed by narrowing a flow passage area due to said wall portion provided on said part of the flow channel,said sample is held back by the wall portion of said narrowed section so that said sample is retained in said suction cavity when the sample is sucked into said suction cavity, and allows the sample accumulated in said suction cavity to circulate into said analytical cavity through said gap, when a centrifugal force is applied from the outside, andsaid analytical cavity is not provided with an air vent, said analytical cavity vents air displaced by the sample from said suction cavity by way of the gap in the flow channel which communicates with an outlet for venting air provided in said suction cavity,wherein said narrowed section comprises;
a first portion where a flow channel area is gradually decreased on the suction cavity side, anda second portion where the flow channel area stays narrow for a predetermined distance between said suction cavity side and said flow channel side, and wherein,said narrow area increases in the rear of said second portion, from said flow channel area having been narrowed to an original area of said flow channel.
3 Assignments
0 Petitions
Accused Products
Abstract
The present invention is directed to a biosensor being provided with a suction cavity which sucks a certain amount of sample by means of capillary phenomenon, the biosensor including a flow channel to connect the suction cavity and an analytical cavity furnished with a reagent, wherein, the flow channel has a narrowed section provided with a gap formed by narrowing a flow passage area. The narrowed section has a function to retain the sample in the suction cavity when the sample is sucked therein, and a function to circulate the sample retained in the suction cavity into the analytical cavity through the gap, when a centrifugal force is applied from the outside. The two functions held by the narrowed section enables a simple collection of blood sample, and further enables a simple transfer of the blood sample to the analytical area by applying the centrifugal force to the blood sample, as well as facilitating a component extraction.
10 Citations
19 Claims
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1. A biosensor being provided with a suction cavity which sucks a certain amount of sample by means of capillary phenomenon, said biosensor comprising:
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a flow channel to connect said suction cavity and an analytical cavity furnished with a reagent, and a wall portion formed by projecting at least any one of an upper surface, a lower surface, and side walls of said flow channel, said wall portion provided on a part of said flow channel to form a narrowed section, said narrowed section is provided with a gap formed by narrowing a flow passage area due to said wall portion provided on said part of the flow channel, said sample is held back by the wall portion of said narrowed section so that said sample is retained in said suction cavity when the sample is sucked into said suction cavity, and allows the sample accumulated in said suction cavity to circulate into said analytical cavity through said gap, when a centrifugal force is applied from the outside, and said analytical cavity is not provided with an air vent, said analytical cavity vents air displaced by the sample from said suction cavity by way of the gap in the flow channel which communicates with an outlet for venting air provided in said suction cavity, wherein said narrowed section comprises; a first portion where a flow channel area is gradually decreased on the suction cavity side, and a second portion where the flow channel area stays narrow for a predetermined distance between said suction cavity side and said flow channel side, and wherein, said narrow area increases in the rear of said second portion, from said flow channel area having been narrowed to an original area of said flow channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification