# US 11,992,841 B2 · Test apparatus, injection method, and microchannel device

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,992,841 B2
- Document ID: US11992841B2
- Status: Granted
- Kind: B2
- Application number: 17/466,430
- Filed: 2021-09-03
- Published: 2022-03-10
- Granted: 2024-05-28
- Earliest claimed: 2020-09-07
- Assignees: Shimadzu Corporation
- Applicants: Shimadzu Corporation
- Inventors: Ippei Takeuchi
- Web page: https://patentgrep.com/patent/US11992841B2

## CPC

- B01L 3/502723: {characterised by venting arrangements}
- B01L 3/502746: {characterised by the means for controlling flow resistance, e.g. flow controllers, baffles or throttle valves}
- B01L 3/502707: {characterised by the manufacture of the container or its components}
- B01L 3/502715: {characterised by interfacing components, e.g. fluidic, electrical, optical or mechanical interfaces}
- B01L 2200/0621: Control of the sequence of chambers filled or emptied
- B01L 2200/0689: Sealing
- B01L 2200/142: Preventing evaporation
- B01L 2200/16: Reagents, handling or storing thereof
- B01L 2300/04: Closures and closing means
- B01L 2300/069: Absorbents; Gels to retain a fluid
- B01L 2300/0816: Cards, e.g. flat sample carriers usually with flow in two horizontal directions
- B01L 2300/0864: comprising only one inlet and multiple receiving wells, e.g. for separation, splitting
- B01L 2300/0883: Serpentine channels
- B01L 2400/0487: fluid pressure, pneumatics
- B01L: CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE

## Abstract

A test apparatus for a test using a test solution containing a sample with the use of a microchannel device is provided. The test apparatus includes a pressure application unit that is connected to a first opening and applies an air pressure to inject the test solution into a microchannel, an opening and closing unit that switches between opening and closing of a second opening, and a controller that controls the pressure application unit and the opening and closing unit. The controller controls the opening and closing unit to close the second opening, controls the pressure application unit to inject the test solution into the microchannel, controls the opening and closing unit to open the second opening after the test solution is injected into the microchannel, and controls the pressure application unit to apply an air pressure to collect in a collection portion, the test solution in a branch channel.

## Claims

### Claim 1

A test apparatus for testing a test solution containing a sample, the test apparatus comprising:
a microchannel device, the microchannel device including:
a first opening for receiving a test solution;
one or more branch channels wherein each branch channel of the one or more branch channels communicates with the first opening;
a plurality of microchannels wherein each microchannel of the plurality of microchannels has a first end and a second end, wherein the first end communicates with at least one of the one or more branch channels;
an agent in one or more of the plurality of microchannels;
a collection portion for collecting at least a portion of the test solution, the collection portion disposed at an end of each of the branch channels;
a second opening disposed in the collection portion;
a third opening disposed at each second end of the plurality of microchannels;
the test apparatus further comprising:
a pipet nozzle;
a pump configured to inject the test solution through the first opening into the microchannels by applying an air pressure via the pipet nozzle such that the test solution can react with the agent;
an opening and closing mechanism for opening and closing the second opening;
a controller programmed to control the pump, the pipet nozzle, and the opening and closing mechanism, wherein the controller controls the opening and closing mechanism such that the second opening closes with the third opening opened and wherein the controller controls the pump and the pipet nozzle such that the pump and the pipet nozzle injects the test solution into the microchannels, then controls the opening and closing mechanism such that the second opening opens after the test solution is injected into the microchannels and then controls the pump such that the pump applies an air pressure to collect the test solution from each branch channel of the one or more branch channels into the collection portion.

### Claim 2 (depends on 1)

The test apparatus according to claim 1, wherein
the opening and closing mechanism includes a mechanism for closing the second opening with an elastic member.

### Claim 3 (depends on 1)

The test apparatus according to claim 1, further comprising:
a pipet chip connected to the pipet nozzle for sucking or discharging the test solution; and
a movement mechanism configured to change a position of the pipet chip and a position of the microchannel device relative to each other such that the movement mechanism connects the pipet chip to the first opening to discharge the test solution to the first opening as the test solution is injected into at least one of the plurality microchannels.

### Claim 4 (depends on 1)

The test apparatus according to claim 1, further comprising:
an applicator configured to apply a sealing material that suppresses a volatilization of the test solution to at least to the first opening and the third opening of each of the microchannels.

### Claim 5 (depends on 4)

The test apparatus according to claim 4, wherein the sealing material is a silicone oil.

### Claim 6

A test apparatus for testing a test solution containing a sample, the test apparatus comprising:
a microchannel device, the microchannel device including:
a first opening for receiving a test solution;
one or more branch channels wherein each branch channel of the one or more branch channels communicates with the first opening;
a plurality of microchannels wherein each microchannel of the plurality of microchannels has a first end and a second end, wherein the first end communicates with at least one of the one or more branch channels;
a collection portion for collecting at least a portion of the test solution, the collection portion disposed at an end of each of the branch channels of the one or more branch channels;
a second opening disposed in the collection portion;
a third opening disposed at each second end of the plurality of microchannels;
the test apparatus further comprising:
a pipet nozzle;
a pump configured to inject the test solution through the first opening into the microchannels by applying an air pressure via the pipet nozzle;
an opening and closing mechanism for opening and closing the second opening;
a controller programmed to control the pump, the pipet nozzle, and the opening and closing mechanism, wherein the controller controls the opening and closing mechanism such that the second opening closes with the third opening opened and wherein the controller controls the pump and the pipet nozzle such that the pump and the pipet nozzle injects the test solution into the microchannels, then controls the opening and closing mechanism such that the second opening opens after the test solution is injected into the microchannels and then controls the pump such that the pump applies an air pressure to collect the test solution from each branch channel of the one or more branch channels into the collection portion.