# US 11,109,814 B2 · Physiological parameter system

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

- Number: US 11,109,814 B2
- Document ID: US11109814B2
- Status: Granted
- Kind: B2
- Application number: 16/159,278
- Filed: 2018-10-12
- Published: 2019-09-05
- Granted: 2021-09-07
- Earliest claimed: 2004-03-08
- Assignees: Masimo Corporation
- Applicants: Masimo Corporation
- Inventors: Ammar Al-Ali; John Graybeal; Massi Joe E. Kiani; Michael Petterson
- Web page: https://patentgrep.com/patent/US11109814B2

## CPC

- A61B 5/7275: {Determining trends in physiological measurement data; Predicting development of a medical condition based on physiological measurements, e.g. determining a risk factor}
- A61B 5/14551: {for measuring blood gases}
- A61B 5/7221: {Determining signal validity, reliability or quality (preventing, reducing or removing noise induced by motion artefacts A61B5/7207; noise originating from a therapeutic or surgical apparatus A61B5/7217)}
- A61B 5/746: {Alarms related to a physiological condition, e.g. details of setting alarm thresholds or avoiding false alarms}
- A61B 5/0836: {Measuring rate of CO2 production}
- A61B 2560/0276: Determining malfunction
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

A physiological parameter system has one or more parameter inputs responsive to one or more physiological sensors. The physiological parameter system may also have quality indicators relating to confidence in the parameter inputs. A processor is adapted to combine the parameter inputs, quality indicators and predetermined limits for the parameters inputs and quality indicators so as to generate alarm outputs or control outputs or both.

## Claims

### Claim 1

A patient monitor comprising one or more hardware processors configured to:
receive at least one pulse oximetry parameter responsive to irradiation of a tissue site with an optical sensor;
receive a secondary parameter responsive to measurement from a second sensor, wherein the secondary parameter is different from the pulse oximetry parameter received by the optical sensor;
generate a variable threshold for the pulse oximetry parameter based on the trend property of the secondary parameter;
compare the pulse oximetry parameter with the variable threshold corresponding to physiological condition of a patient; and
generate a diagnosis decision based on the comparison of the pulse oximetry parameter with the variable threshold.

### Claim 2 (depends on 1)

The patient monitor of claim 1, wherein the secondary parameter is ETCO2.

### Claim 3 (depends on 1)

The patient monitor of claim 1, wherein the secondary parameter is respiration rate.

### Claim 4 (depends on 1)

The patient monitor of claim 1, wherein the one or more hardware processors are further configured to control a medical device based on the generated diagnosis.

### Claim 5

A patient monitoring method comprising:
receiving at least one pulse oximetry parameter responsive to irradiation of a tissue site with an optical sensor;
receiving a secondary parameter responsive to measurement from a second sensor, wherein the secondary parameter is different from the pulse oximetry parameter received by the optical sensor;
generating a variable threshold for the pulse oximetry parameter based on a trend property of the secondary parameter;
comparing the pulse oximetry parameter with the variable threshold corresponding to physiological condition of a patient; and
generating a diagnosis decision based on the comparison of the first pulse oximetry parameter and variable threshold.

### Claim 6 (depends on 5)

The patient monitoring method of claim 5, wherein the secondary parameter is ETCO2.

### Claim 7 (depends on 5)

The patient monitoring method of claim 5, wherein the secondary parameter is respiration rate.

### Claim 8 (depends on 5)

The patient monitoring method of claim 5, wherein the one or more hardware processors are further configured to control a medical device based on the generated diagnosis.