Micro flow path device, testing method using micro flow path device, and testing apparatus using micro flow path device

Patent metadata

Field	Value
Publication number	US-12050231-B2
Application number	US-202017615893-A
Country	US
Kind code	B2
Filing date	May 25, 2020
Priority date	Jun 3, 2019
Publication date	Jul 30, 2024
Grant date	Jul 30, 2024

Abstract

A testing method using a micro flow path device configured for a test liquid containing a specimen to be brought into contact with a drug therein and for a test on an action of the drug on the specimen includes: preparing the micro flow path device including: a plurality of micro flow paths, first and second openings which are disposed at both ends of each of the plurality of micro flow paths and communicate with an outside, a storage unit which is provided in each of the plurality of micro flow paths and stores the drug, and a gas-permeable membrane covering the first opening; applying a fluid pressure higher than an external pressure to the test liquid through the second opening from a syringe pump connected to the second opening to pressure-feed the test liquid to the storage unit; and observing a target region set in the micro flow path.

First claim

The invention claimed is:

1. A testing method using a micro flow path device, the micro flow path device being configured for a test liquid containing a specimen to be brought into contact with a drug therein and for a test on an action of the drug on the specimen, the method comprising:
preparing a micro flow path device which includes:
a plurality of micro flow paths;
first openings respectively disposed at one end of each of the plurality of micro flow paths and which communicate with an outside, and a second opening disposed at opposite ends of each of the plurality of micro flow paths and which communicates with an outside;
storage units which store the drug and which are provided in the plurality of micro flow paths, respectively; and
a gas-permeable membrane which covers each first opening;

applying a fluid pressure higher than an external pressure to the test liquid through the second opening from a pressure source connected to the second opening to pressure-feed the test liquid to each storage unit; and
observing a target region set in each micro flow path,
wherein for each micro flow path of the plurality of micro flow paths, the second opening, the storage unit, the target region and the first opening are arranged in this order in a longitudinal direction of the micro flow path.

2. The testing method using the micro flow path device according to claim 1 , the method further comprising: holding a state for a predetermined period in which the fluid pressure to the test liquid is applied.

3. The testing method using the micro flow path device according to claim 2 , wherein the holding includes applying air pressure to the test liquid.

4. The testing method using the micro flow path device according to claim 1 , wherein
the test liquid is a bacterial liquid, and
the drug is an antibacterial drug.

5. A micro flow path device configured for a test liquid containing a specimen to be brought into contact with a drug therein and for a test on an action of the drug on the specimen, the device comprising:
a first micro flow path which has a first end and a second end and allows the test liquid to flow therethrough;
a storage unit in which the drug is stored and which is connected to the second end of the first micro flow path such that the test liquid is allowed to flow therethrough;
a second micro flow path which has a first end and a second end and allows the test liquid to flow therethrough, the storage unit being connected to the first end of the second micro flow path;
a first opening at the second end of the second micro flow path and which communicates with the storage unit via the second micro flow path;
a second opening at the first end of the first micro flow path and which communicates with the storage unit;
a target region set in the second micro flow path; and
a gas-permeable membrane which covers the first opening,
wherein the second opening, the storage unit, the target region and the first opening are arranged in this order in a longitudinal direction of the first and second micro flow paths.

6. The micro flow path device according to claim 5 ,
wherein the target region in the second micro flow path is imaged by a microscope.

7. The micro flow path device according to claim 6 , further comprising:
a first plate-shaped member; and
a second plate-shaped member which is stacked on the first plate-shaped member, wherein
the second micro flow path is formed at a boundary between the first plate-shaped member and the second plate-shaped member, and
a part of the first plate-shaped member and a part of the second plate-shaped member forming the second micro flow path are transparent.

8. The micro flow path device according to claim 6 , further comprising:
a plurality of the first micro flow paths;
a plurality of the storage units respectively connected to the plurality of first micro flow paths; and
a plurality of the second micro flow paths respectively connected to the plurality of storage units, wherein
the plurality of second micro flow paths are formed adjacent to each other.

9. The micro flow path device according to claim 5 ,
wherein a pump which applies air pressure to the test liquid is connected to the second opening of the first micro flow path.

10. The micro flow path device according to claim 6 ,
wherein a pump which applies air pressure to the test liquid is connected to the second opening of the first micro flow path.

11. The micro flow path device according to claim 5 , further comprising:
a first plate-shaped member;
a second plate-shaped member which is stacked on the first plate-shaped member, wherein
the second micro flow path is formed at a boundary between the first plate-shaped member and the second plate-shaped member, and
a part of the first plate-shaped member and a part of the second plate-shaped member forming the second micro flow path are transparent.

12. A testing apparatus using a micro flow path device, the micro flow path device configured for a test liquid containing a specimen to be brought into contact with a drug therein and for a test on an action of the drug on the specimen, the apparatus comprising:
the micro flow path device which includes
a first micro flow path which has a first end and a second end and allows the test liquid to flow therethrough,
a storage unit in which the drug is stored and which is connected to the second end of the first micro flow path such that the test liquid is allowed to flow therethrough,
a second micro flow path which has a first end and a second end and allows the test liquid to flow therethrough, the storage unit being connected to the first end of the second micro flow path,
a first opening at the second end of the second micro flow path and which communicates with the storage unit via the second micro flow path,
a gas-permeable membrane which covers the first opening,
a second opening which is formed at the first end of the first micro flow path and which communicates with the storage unit, and
a target region set in the second micro flow path;

a pump which is connected to the second opening of the first micro flow path and applies air pressure to the test liquid;
a table on which the micro flow path device is placed;
a drive mechanism which drives the table along a horizontal direction; and
a control unit which controls the drive mechanism, wherein
the control unit causes the drive mechanism to drive the table such that the target region in the second micro flow path is positioned in an imaging region of a microscope, and
the second opening, the storage unit, the target region and the first opening are arranged in this order in a longitudinal direction of the first and second micro flow paths.

13. The testing apparatus using the micro flow path device according to claim 12 , wherein
the micro flow path device includes a plurality of the second micro flow paths, and
the control unit causes the drive mechanism to drive the table such that the target region of each of the plurality of second micro flow paths is positioned in the imaging region of the microscope.

14. A testing apparatus using a micro flow path device, the micro flow path device configured for a test liquid containing a specimen to be brought into contact with a drug therein and for a test on an action of the drug on the specimen, the apparatus comprising:
the micro flow path device which includes
a first micro flow path which has a first end and a second end and allows the test liquid to flow therethrough,
a storage unit in which the drug is stored and which is connected to the second end such that the test l

Assignees

• Shimadzu Corp

Inventors

• Iwata Hiroshi
• Goto Hiroomi
• ZODA Shigehiko
• Ozeki Eiichi
• Nishimoto Takahiro
• Rotzetter Aline
• Yoneda Yasuko
• Takeuchi Ippei

Classifications

• G02B21/365

  Control or image processing arrangements for digital or video microscopes (G02B21/361, G02B21/362 take precedence) · CPC title

• B01L2400/0487

  fluid pressure, pneumatics · CPC title

• B01L2300/0864

  comprising only one inlet and multiple receiving wells, e.g. for separation, splitting · CPC title

• B01L2300/0816

  Cards, e.g. flat sample carriers usually with flow in two horizontal directions · CPC title

• B01L2200/0684

  Venting, avoiding backpressure, avoid gas bubbles · CPC title