# US 5,252,293 A · Analytical slide with porous filter membrane

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- Number: US 5,252,293 A
- Document ID: US5252293A
- Status: Granted
- Kind: A
- Application number: 07/297,767
- Filed: 1989-01-17
- Granted: 1993-10-12
- Earliest claimed: 1989-01-17
- Inventors: Vladimir Drbal; Calvin Chow; Rick Smethers; Debra A. Ross; Gregory Kirk; Briggs, Jonathan; Lev Leytes; Suresh N. Mehta
- Web page: https://patentgrep.com/patent/US5252293A

## CPC

- G01N 35/00009: {provided with a sample supporting tape, e.g. with absorbent zones}
- G01N 33/5302: {Apparatus specially adapted for immunological test procedures}
- G01N 33/54366: {Apparatus specially adapted for solid-phase testing}
- G01N 35/00029: {provided with flat sample substrates, e.g. slides (G01N35/028 takes precedence)}
- G01N 2035/00138: {Slides}
- G01N 2035/00485: {combined with sample carriers}
- Y10S 435/97: Test strip or test slide
- Y10T 436/11: Automated chemical analysis
- Y10T 436/112499: with sample on test slide
- Y10T 436/25: including sample preparation
- Y10T 436/25375: Liberation or purification of sample or separation of material from a sample [e.g., filtering, centrifuging, etc.]
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

This invention encompasses a slide reading assembly, and a slide with a porous filter membrane wherein the slide has a means for aligning the slide within a filter assembly to filter reagents on predetermined portions of the porous filter membrane and also to position the slide in a slide reading assembly so that detection will occur in those same predetermined locations.

## Claims

### Claim 1

A slide comprising a flat generally rectangular plastic sheet with a front and a rear end wherein the slide has a first and second means for aligning the slide both in a filter assembly and a slide reading assembly; wherein the first means for aligning the slide comprises a notch at the front end of the slide configured to fit a peg provided in a filter assembly and a peg provided in a reading assembly; the first means for aligning further comprises slits in the front end adjacent to the notch, the slits allowing resilient expansion of the notch; wherein the second means for aligning the slide is a portion at the front end which is narrower than the rear end; the rear end of the slide having an area for manually grasping the slide; the slide further defines an opening at the front end which is covered with a porous filter membrane having a hapten bound thereto; wherein the membrane has a pore size of about 0.25 .mu.m to about 12.0 .mu.m and a thickness of about 50 .mu.m to about 120 .mu.m; wherein the alignment means provide for deposition of analyte or analyte complex onto predetermined locationso the porous filter membrane in the filter assembly and for detection of analyte or analyte complex at these same predetermined locations in a slide reading assembly; wherein the membrane has a hapten binding potential sufficient to capture the hapten on the membrane at a flow rate of about 100 .mu.L/min. and sufficient to retain the hapten on the membrane at flow rates of about 6 mL/min.; and wherein the slide has a buffering capacity of 1-10 m mole per liter of compressed membrane volume.