# US 11,998,909 B2 · Method for continuously collecting fluorescence data of microfluidic chip

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- Number: US 11,998,909 B2
- Document ID: US11998909B2
- Status: Granted
- Kind: B2
- Application number: 16/949,345
- Filed: 2020-10-26
- Published: 2021-09-09
- Granted: 2024-06-04
- Earliest claimed: 2020-03-06
- Assignees: Capitalbio Technology (Chengdu) Co., Ltd.
- Applicants: Capitalbio Technology (Chengdu) Co., Ltd.
- Inventors: Yong Huang; Guanbin Zhang; Chicheng Song; Yong Tao; Ruoran Li; Hongcheng Zhou
- Web page: https://patentgrep.com/patent/US11998909B2

## CPC

- B01L 3/502715: {characterised by interfacing components, e.g. fluidic, electrical, optical or mechanical interfaces}
- G01N 21/6452: {Individual samples arranged in a regular 2D-array, e.g. multiwell plates}
- G01N 15/1484: {microstructural devices}
- G01N 2015/1402: {Data analysis by thresholding or gating operations performed on the acquired signals or stored data}
- G01N 2201/0415: Carrusel, sequential
- B01L: CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- 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)

## Abstract

A method for continuously collecting fluorescence data of a microfluidic chip is provided. In the method, an optical path system emits a light perpendicular to the microfluidic chip, such that a center of a light spot formed by the optical path system on the microfluidic chip is located on a circle formed by centers of all reaction cells. The microfluidic chip is rotated around a center of the circle formed by centers of all the reaction cells. Fluorescence signal values are collected by using the optical path system along a rotation direction of the microfluidic chip. The collected fluorescence signal values are processed to obtain effective fluorescence data of all the reaction cells.

## Claims

### Claim 1

A method for continuously collecting fluorescence data of a microfluidic chip, comprising:
emitting, by an optical path system, a light perpendicular to the microfluidic chip, wherein centers of all reaction cells forms a same circle, and a center of a light spot formed by the light on the microfluidic chip is always located on the circle formed by the centers of all reaction cells;
rotating the microfluidic chip around a center of the circle formed by the centers of all the reaction cells, and collecting fluorescence signal values along a rotation direction of the microfluidic chip by using the optical path system; and
processing the collected fluorescence signal values to obtain effective fluorescence data of all the reaction cells,
wherein the microfluidic chip is rotated by one revolution to collect fluorescence signal values of all the reaction cells for each time,
wherein the processing the collected fluorescence signal values to obtain effective fluorescence data of all the reaction cells comprises:
step (1), determining a maximum value A among fluorescence signal values of one of the reaction cell;
step (2), calculating B according to B=A*S, where S represents a preset coefficient, and 0<S<1:
step (3), counting the number N of fluorescence signal values greater than B among the fluorescence signal values of the reaction cell;
step (4), determining A as the effective fluorescence data of the reaction cell if N is greater than or equal to P, where P represents a preset threshold,
wherein the steps (1) to (4) are performed for each of the reaction cells to obtain effective fluorescence data of each of the reaction cells.

### Claim 2 (depends on 1)

The method for continuously collecting fluorescence data of a microfluidic chip according to claim 1, wherein the microfluidic chip is rotated in a clockwise direction or a counterclockwise direction.

### Claim 3 (depends on 2)

The method for continuously collecting fluorescence data of a microfluidic chip according to claim 2, wherein the microfluidic chip is driven by a motor to rotate.

### Claim 4 (depends on 1)

The method for continuously collecting fluorescence data of a microfluidic chip according to claim 1, further comprising:
repeating, if N is less than P, the steps (1) to (4) by using a sub-maximum value An among the fluorescence signal values of the reaction cell as A, until N is greater than or equal to P, and
determining the finally used sub-maximum value An as the effective fluorescence data of the reaction cell.

### Claim 5 (depends on 4)

The method for continuously collecting fluorescence data of a microfluidic chip according to claim 4, wherein the microfluidic chip is driven by a motor to rotate.

### Claim 6 (depends on 1)

The method for continuously collecting fluorescence data of a microfluidic chip according to claim 1, wherein the microfluidic chip is driven by a motor to rotate.

### Claim 7 (depends on 1)

The method for continuously collecting fluorescence data of a microfluidic chip according to claim 1, wherein the microfluidic chip is driven by a motor to rotate.

### Claim 8 (depends on 7)

The method for continuously collecting fluorescence data of a microfluidic chip according to claim 7, further comprising:
detecting, a rotation speed of the motor in real time while collecting the fluorescence signal values; and
triggering, an alarm if it is detected that the rotation speed of the motor is abnormal.

### Claim 9 (depends on 1)

The method for continuously collecting fluorescence data of a microfluidic chip according to claim 1, further comprising:
collecting, fluorescence signal values of the microfluidic chip continuously, and obtaining continuously effective fluorescence data based on the collected fluorescence signal values;
comparing, effective fluorescence data of a reaction cell obtained based on fluorescence signal values collected at a previous time and effective fluorescence data of the reaction cell obtained based on fluorescence signal values collected at a current time;
determining, if the effective fluorescence data at the current time is in a range of ±C % of the effective fluorescence data at the previous time, that the effective fluorescence data at the current time is normal; and
determining, if the effective fluorescence data at the current time is not in the range of ±C % of the effective fluorescence data at the previous time, that the effective fluorescence data at the current time is abnormal.

### Claim 10 (depends on 9)

The method for continuously collecting fluorescence data of a microfluidic chip according to claim 9, wherein the microfluidic chip is driven by a motor to rotate.

### Claim 11 (depends on 9)

The method for continuously collecting fluorescence data of a microfluidic chip according to claim 9, further comprising:
continuously collecting, if the effective fluorescence data at the current time t is abnormal, the fluorescence signal values of the microfluidic chip for another three consecutive times t+1, t+2, and t+3, and
determining, if effective fluorescence data of the reaction cell at the time t+2 is in a range of ±C % of effective fluorescence data of the reaction cell at the time t+1 and effective fluorescence data of the reaction cell at the time t+3 is in a range of ±C % of the effective fluorescence data of the reaction cell at the time t+2, that the effective fluorescence data of the reaction cell at the three times is normal.

### Claim 12 (depends on 11)

The method for continuously collecting fluorescence data of a microfluidic chip according to claim 11, further comprising:
trigging an alarm if the effective fluorescence data is determined to be abnormal for more than D times, where D represents a preset value.

### Claim 13 (depends on 11)

The method for continuously collecting fluorescence data of a microfluidic chip according to claim 11, wherein the microfluidic chip is driven by a motor to rotate.

### Claim 14 (depends on 9)

The method for continuously collecting fluorescence data of a microfluidic chip according to claim 9, further comprising:
trigging an alarm if the effective fluorescence data is determined to be abnormal for more than D times, where D represents a preset value.

### Claim 15 (depends on 14)

The method for continuously collecting fluorescence data of a microfluidic chip according to claim 14, wherein the microfluidic chip is driven by a motor to rotate.