Filter test strip

• US 9,194,777 B2
• Filed: 02/19/2013
• Issued: 11/24/2015
• Est. Priority Date: 04/19/2012
• Status: Active Grant

• Current Assignee: Bioptik Technology, Inc.
• Original Assignee: Bioptik Technology, Inc.
• Inventors: Lai, Chin-Shan, Yang, Chin-Chang, Wu, Kun-Lieh, Chang, Ya-Yuan
• Primary Examiner(s): WHITE, DENNIS MICHAEL
• Application Number:
  US13/770,704
• Publication Number:
  US 20130280800A1
• Time in Patent Office: 1,008 Days
• Field of Search: 422/52, 422/73, 422/82.01, 422/82.05, 422/82.08, 422/82.09, 422/82.11, 422/99, 422/102, 422/400, 422/401, 422/420, 422/421, 422/422, 422/423, 422/424, 422/425, 422/426, 422/427, 422/428, 422/429, 422/68.1, 422/82.06, 422/407, 422/501, 422/502, 422/503, 422/504, 436/164, 436/177, 436/43, 436/63
• US Class Current: 1/1
• CPC Class Codes: B01L 2300/0681 Filter
• CPC Class Codes: B01L 2300/0816 Cards, e.g. flat sample carriers usually with flow in two horizontal directions
• CPC Class Codes: B01L 2300/0825 Test strips
• CPC Class Codes: B01L 2300/0887 Laminated structure
• CPC Class Codes: G01N 1/34 Purifying; Cleaning processes or apparatus for extracting or separating nucleic acids from biological samples C12N15/1003
• CPC Class Codes: G01N 15/01 specially adapted for biological cells, e.g. blood cells investigating sedimentation of particle suspensions in blood G01N15/05
• CPC Class Codes: G01N 2001/4088 filtration
• CPC Class Codes: G01N 2458/00 Labels used in chemical analysis of biological material
• CPC Class Codes: G01N 27/42 Measuring deposition or liberation of materials from an electrolyte; Coulometry, i.e. measuring coulomb-equivalent of material in an electrolyte
• CPC Class Codes: G01N 27/423 Coulometry
• CPC Class Codes: G01N 33/525 Multi-layer analytical elements
• CPC Class Codes: G01N 33/558 using diffusion or migration of antigen or antibody immunochromatographic test strips G01N33/54387

Abstract

A filter test strip to filter and test a specimen in liquid includes a test element and a specimen filter assembly which is located on the test element and includes a filter cotton holding layer, a filter cotton layer and a cotton bonding layer. The filter cotton holding layer has a filter channel to allow the specimen in liquid to pass through. The filter cotton layer fills the filter channel. A gap is formed between the filter cotton holding layer and filter cotton layer. The cotton bonding layer is located below the filter cotton holding layer and bonded to the test element via an adhesive which masks the gap. Hence the specimen in liquid can be prevented from seeping out through the gap with passing through the filter cotton layer. Therefore, the specimen in liquid can fully be filtered by the filter cotton layer to enhance test accuracy.

Claims

1. A filter test strip to filter and test a specimen in liquid, comprising:

a test element; and

a specimen filter assembly which is located on the test element and includes at least one filter cotton holding layer, at least one filter cotton layer and at least one cotton bonding layer;

the filter cotton holding layer including a plurality of inner side walls to define a filter channel to allow the specimen in liquid to pass through, the filter cotton layer filling within the corresponding filter channel, the plurality of inner side walls and the filter cotton layer being spaced by a gap, the cotton bonding layer being located below the filter cotton holding layer, the filter cotton holding layer including a surface which faces the cotton bonding layer and bonds to the cotton bonding layer via an adhesive to make the whole surface of the filter cotton holding contact the contact bonding layer, the adhesive fully covering a circumference of the filter channel and masking the gap between the plurality of inner side walls and the filter cotton layer.

2. The filter test strip of claim 1 further including a cotton press layer and an upper lid that sequentially cover the specimen filter assembly and mask the filter channel, the cotton press layer including a passage to receive the specimen in liquid from outside and communicate with the filter channel.

3. The filter test strip of claim 2, wherein the passage transversely runs through the cotton press layer to form an air outlet and a specimen inlet.

4. The filter test strip of claim 3 further including a passage layer located between the cotton press layer and the upper lid, the passage layer including an ancillary passage formed at an area greater than that of the passage and corresponding to the passage.

5. The filter test strip of claim 4, wherein the ancillary passage transversely runs through the passage layer to form an ancillary air outlet and an ancillary specimen inlet.

6. The filter test strip of claim 1, wherein the test element includes a substrate and an electrode formed on the substrate to contact the filter channel.

7. The filter test strip of claim 2, wherein the passage includes a specimen inlet, the filter cotton holding layer including an output channel communicating with the outside and the filter channel.

8. The filter test strip of claim 7 further including a passage layer located between the cotton press layer and the upper lid, the passage layer including an ancillary passage formed at an area greater than that of the passage and corresponding to the passage.

9. The filter test strip of claim 8, wherein the ancillary passage including an ancillary specimen inlet.