# US 7,407,815 B2 · Liquid crystal cassette > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,407,815 B2 - Document ID: US7407815B2 - Status: Granted - Kind: B2 - Application number: 11/535,739 - Filed: 2006-09-27 - Published: 2007-04-26 - Granted: 2008-08-05 - Earliest claimed: 2005-09-28 - Assignees: Kent State University; Northeastern Ohio Universities College of Medicine - Inventors: Christopher J. Woolverton; Gary D. Niehaus - Web page: https://patentgrep.com/patent/US7407815B2 ## CPC - G01N 21/77: by observing the effect on a chemical indicator - B01F 33/452: using independent floating stirring elements - B01F 35/712: {for feeding fluids} - B01F 35/71725: {using centrifugal forces} - B01L 3/502: {with fluid transport, e.g. in multi-compartment structures} - G01N 21/03: Cuvette constructions - G01N 33/5302: {Apparatus specially adapted for immunological test procedures} - B01F 33/30: Micromixers - B01L 3/5023: {with a sample being transported to, and subsequently stored in an absorbent for analysis} - B01L 2300/0681: Filter - B01L 2300/0803: Disc shape - B01L 2300/0864: comprising only one inlet and multiple receiving wells, e.g. for separation, splitting - B01L 2400/0409: centrifugal forces - G01N 2021/0325: {Cells for testing reactions, e.g. containing reagents} - G01N 2021/7783: {Transmission, loss} - Y10S 435/81: Packaged device or kit - Y10S 436/805: Optical property - 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) - B01F: MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING (mixing paints B44D3/06) - B01L: CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ## Abstract A functional cassette for the detection of ligands comprises a first inner housing, a second middle housing and a third outer housing and each housing is at least partially rotatable relative to an adjoining housing. The first inner housing contains a central well adapted for receiving a sample, and the central well is in selectable fluid communication with at least one mixing chambers. The mixing chambers contain a reagent for forming a complex with a ligand. The first inner housing additionally comprises at least one compartments for the storage of a liquid crystalline material, and the compartments are in selectable fluid communication with at least one mixing chambers. The third outer housing comprises at least one detection chambers for observing the light transmission properties of a liquid crystal material and the detection chambers are in selectable fluid communication with the mixing. ## Claims ### Claim 1 A functional cassette for the detection of ligands comprising: a first housing, a second housing and a third housing; wherein each housing is at least partially rotatable relative to an adjoining housing; wherein the first housing contains a sample well to receive a sample, and the sample well is in fluid communication with at least one mixing chamber located within the second housing when the first housing is in a first position relative to the second housing; wherein the at least one mixing chamber contains at least one receptor bindable to a specific type of ligand to form a receptor-ligand complex; at least one compartment for storing a liquid crystalline material, wherein the at least one compartment is in fluid communication with the at least one mixing chamber when the first housing is in a second position relative to the second housing; wherein the third housing comprises at least one detection chamber for observing a signal generated after formation of the receptor-ligand complex; and wherein the at least one detection chamber is in fluid communication with the at least one mixing chamber when the third housing is in a first position relative to the second housing. ### Claim 2 (depends on 1) The cassette of claim 1, wherein the ligand is a pathogenic agent or product of a pathogenic agent. ### Claim 3 (depends on 2) The cassette of claim 2, wherein the at least one receptor is an antibody. ### Claim 4 (depends on 3) The cassette of claim 3, wherein the ligand is bindable to a specific antibody. ### Claim 5 (depends on 1) The cassette of claim 1, wherein liquid crystalline material is selected from the group consisting of thermotropic and lyotropic liquid crystalline materials. ### Claim 6 (depends on 1) The cassette of claim 1, wherein the signal is generated by a change in light transmission properties of the liquid crystalline material. ### Claim 7 (depends on 1) The cassette of claim 1, wherein the signal is optically observable. ### Claim 8 (depends on 1) The cassette of claim 1 further comprising a control mixing chamber. ### Claim 9 (depends on 8) The cassette of claim 8, wherein the control mixing chamber is manipulated to prevent the transfer of the sample into the at least one control mixing chamber. ### Claim 10 (depends on 1) The cassette of claim 1, wherein the at least one mixing chamber includes a plurality of receptors bindable to a plurality of ligands, wherein the cassette detects a plurality of ligands. ### Claim 11 (depends on 1) The cassette of claim 1 further comprising at least one sample channel that connects the sample well with at least one mixing chambers. ### Claim 12 A method of detecting a ligand, the method comprising: providing a cassette, the cassette comprising: a first housing, a second housing and a third housing; wherein each housing is at least partially rotatable relative to an adjoining housing; wherein the first housing contains a sample well to receive a sample, and the sample well is in fluid communication with at least one mixing chamber located in the second housing when the first housing is in a first position relative to the second housing; wherein the at least one mixing chamber contains at least one receptor bindable to a ligand to form a receptor-ligand complex; at least one liquid crystalline storage compartment for the storage of a liquid crystalline material, depositing a sample to be tested into the sample well; performing a first centrifugation on the cassette with the first housing in a first position relative to the second housing to introduce at least a portion of the sample from the sample well to the mixing chamber; rotating the first housing to a second position relative to the second housing to permit fluid communication through at least one aperture of the second housing between the mixing chamber and at least one storage compartment of the liquid crystalline material; performing a second centrifugation on the cassette to introduce at least a portion of the liquid crystalline material from the storage compartment to the mixing chamber; rotating the third housing to a second position relative to the second housing; performing a third centrifugation on the cassette to introduce at least a portion of the contents of the mixing chamber to the detection chamber; placing the cassette into a detection device, wherein the detection device transmits light toward the liquid crystal material; and examining the light transmission properties of the liquid crystal material in the detection chambers, wherein the light transmission properties are indicative of the detection of a ligand. ### Claim 13 (depends on 12) The method of claim 12, wherein a portion of the sample moves from the sample well through at least one channel into the mixing chamber during the first centrifugation to promote the formation of the receptor-ligand complex. ### Claim 14 (depends on 12) The method of claim 12, wherein the liquid crystalline material moves from the liquid crystalline storage compartment into the mixing chamber during the second centrifugation to promote mixing with the at least one receptor. ### Claim 15 (depends on 12) The method of claim 12, wherein the ligand is a pathogenic agent or product of a pathogenic agent. ### Claim 16 (depends on 12) The method of claim 12, wherein the at least one receptor is an antibody. ### Claim 17 (depends on 12) The method of claim 12, wherein at least one liquid crystalline material is selected from the group consisting of thermotropic and lyotropic liquid crystalline materials. ### Claim 18 (depends on 12) The method of claim 12, wherein a signal is generated by a change in light transmission properties of the liquid crystalline material. ### Claim 19 (depends on 18) The method of claim 18, wherein the signal is optically observable. ### Claim 20 A method of detecting a plurality of ligands, the method comprising: providing a cassette, the cassette comprising: a first housing, a second housing having a plurality of mixing chambers, with each mixing chamber including at least one receptor bindable to a specific type of ligand, wherein a different type of receptor is provided in different ones of the mixing chambers; a third housing having a plurality of detection chambers, each detection chamber correlating to one of the plurality of mixing chambers, wherein each housing is at least partially rotatable relative to an adjoining housing; wherein the first housing contains a sample well to receive a sample, and the sample well is in fluid communication with at least one mixing chamber located within the second housing when the first housing is in a first position relative to the second housing; at least one liquid crystalline storage compartment for the storage of a liquid crystalline material, depositing a sample to be tested into the sample well; performing a first centrifugation on the cassette with the first housing in a first position relative to the second housing to introduce a portion of the sample from the sample well to the mixing chamber; rotating the first housing to a second position relative to the second housing to permit fluid communication through at least one aperture of the second housing between the mixing chamber and at least one storage compartment of the liquid crystalline material; performing a second centrifugation on the cassette to introduce the liquid crystalline material into the mixing chamber; rotating the third housing to a second position relative to the second housing; performing a third centrifugation on the cassette to move at least some material from the mixing chamber to the detection chamber; placing the cassette into a detection device, wherein the detection device transmits light toward the liquid crystal material; and examining the light transmission properties of the liquid crystal material in the detection chambers, wherein the light transmission properties are indicative of the detection of a ligand.