# US 8,570,512 B2 · System, storage mediums, and methods for identifying particles in flow

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- Number: US 8,570,512 B2
- Document ID: US8570512B2
- Status: Granted
- Kind: B2
- Application number: 13/438,521
- Filed: 2012-04-03
- Published: 2012-12-13
- Granted: 2013-10-29
- Earliest claimed: 2007-09-17
- Assignees: Luminex Corporation
- Applicants: Adam Richard Schilffarth
- Inventors: Adam Richard Schilffarth
- Web page: https://patentgrep.com/patent/US8570512B2

## CPC

- G01N 15/1429: Signal processing
- G01N 15/0205: by optical means
- G01N 15/1012: {Calibrating particle analysers; References therefor}
- G01N 15/1425: {using an analyser being characterised by its control arrangement}
- G01N 15/1427: {with the synchronisation of components, a time gate for operation of components, or suppression of particle coincidences}
- G01N 15/1459: {the analysis being performed on a sample stream}
- G01N 15/1031: by measuring electrical or magnetic effects
- G01N 2015/025: {Methods for single or grouped particles}
- G01N 2015/1014: {Constitution of reference particles}
- G01N 2015/1438: {Using two lasers in succession}
- G01N 2015/1477: {Multiparameters}
- 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

Methods, storage mediums, and systems for correlating pulses generated from multiple interrogation regions in a flow cytometer to particular particles flowing through the flow cytometer are provided. Embodiments of the methods, storage mediums, and systems include configurations for calibrating a flow cytometer using a calibration particle having a unique signature to determine a time-of-flight for particles flowing through the flow cytometer. Based on the calculated time-of-flight and relative positions of interrogation regions corresponding to collectors of the flow cytometer, the methods, storage mediums, and systems may further include configurations for associating other signal pulses to particles of one or more different particle sets.

## Claims

### Claim 1

A flow cytometer, comprising:
a particle flow path;
an illumination system configured to direct light toward multiple and distinct interrogation points of the particle flow path;
a plurality of collectors respectively configured to gather light from an interrogation region comprising the interrogation point and further configured to generate signals representative of a degree of light gathered; and
an examination system comprising a processor and program instructions executable by the processor for:
receiving said signals;
comparing received signals of at least two collectors to predetermined signal ranges associated with a specific particle set;
identifying a particle of the specific particle set upon detecting signal pulses that respectively fit within the predetermined signal ranges;
calculating a time-of-flight of the particle using a time difference between signal pulses received from the at least two collectors;
pinpointing other signal pulses received from each of the collectors and generated at distinct points in time in accordance with the calculated time-of-flight and relative positions of respective interrogation points corresponding to the collectors; and
associating the other signal pulses to a particle of a different particle set.

### Claim 2 (depends on 1)

The flow cytometer of claim 1, wherein the examination system further comprises program instructions executable by the processor for determining characteristics of the particle of the different particle set based on the associated signal pulses.

### Claim 3 (depends on 1)

The flow cytometer of claim 1, wherein the examination system further comprises program instructions executable by the processor for verifying, upon identifying a particle of the specific particle set, a data signal received from another collector is within a preset signal range, wherein the signal pulse received from the other collector is at a point in time in accordance with the calculated time of flight and a position of an interrogation point corresponding to the other collector relative to positions of the interrogation points corresponding to the two collectors.

### Claim 4 (depends on 1)

The flow cytometer of claim 1, wherein distances between the multiple and distinct interrogation points are known, and wherein the examination system further comprises program instructions executable by the processor for determining a velocity of the particle.

### Claim 5 (depends on 1)

The flow cytometer of claim 1, wherein the multiple and distinct interrogation points are evenly spaced along the particle flow path.

### Claim 6 (depends on 1)

The flow cytometer of claim 1, wherein the multiple and distinct interrogation points are unevenly distributed along the particle flow path.

### Claim 7 (depends on 1)

The flow cytometer of claim 1, wherein the two interrogation points corresponding to the two collectors are consecutively arranged along the particle flow path.

### Claim 8 (depends on 1)

The flow cytometer of claim 1, wherein at least one interrogation point is interposed between the two interrogation points corresponding to the two collectors.