Accuracy of Evie Ring Pulse Oximeter in Profound Hypoxia

Accuracy of the Evie Ring Pulse Oximeter in Profound Hypoxia

The goal of this study was to evaluate the accuracy of pulse oximeters over the range of 70-100% per ISO 80601-2-61:2019. Four devices were placed on each subject with two on each index finger at the base and two on each index finger at the fingertip. SpO2 measurements from these devices were compared to sampling of arterial blood during brief stable oxygen desaturation in healthy volunteers to evaluate the claimed range.

Study Overview

• Status: Completed
• Conditions: Hypoxia
• Intervention / Treatment: Device: Pulse oximeter

Detailed Description

The study is an open enrollment, single-center, single blinded design using the investigational ring compared to arterial blood gas measurements (SaO2) and to two commercially available hospital grade reference pulse oximeters (Massimo Radical-7 and Nellcor N-595). To be included in the study, subjects had to meet all the inclusion criteria and not meet any of the exclusion criteria and to sign the written consent. Demographic data were obtained.

The investigational (4/subject) and reference devices were placed. A radial arterial cannula was placed in either the left or right wrist of each subject for arterial blood sampling and blood pressure monitoring. Each subject had two control blood samples taken at the beginning of each experiment, while breathing room air. Hands with test devices and reference pulse oximeters were maintained motionless on arm boards throughout the test. Hypoxemia was then induced to different and stable levels of oxyhemoglobin saturation (between 70-100%) by having subjects breathe mixtures of nitrogen, air, and carbon dioxide. The mixture of gases was controlled by the study physician by adjusting gas flows according to breath-by-breath estimates of oxygen saturation calculated from end-tidal partial pressure of oxygen (PO2) and partial pressure of carbon dioxide (PCO2). Each plateau level of oxyhemoglobin saturation was maintained for at least 30 seconds or until readings were stable. Two arterial blood samples were then obtained, approximately 30 seconds apart. Each stable plateau was maintained for at least 60 seconds with SpO2 fluctuating by less than 2-3%. All investigational, control, and reference data were recorded.

• Study Type: Observational
• Enrollment (Actual): 11

Contacts and Locations

Study Locations

• United States
  • California
    • San Francisco, California, United States, 94133
      • Hypoxia Research Laboratory

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult
• Accepts Healthy Volunteers: Yes

• Sampling Method: Non-Probability Sample

Study Population

Healthy adult participants 18 to 49 years old, of which 2 or 15% of the subject pool is darkly pigmented.

Description

Inclusion Criteria:

Subject is in good general health with no evidence of any medical problems. Subject is fluent in both written and spoken English. Subject provided written informed consent and is willing to comply with the study procedures.

Subject is willing to have their skin color assessed.

Exclusion Criteria:

Subject is obese with a BMI over 30. Subject has a known history of heart disease, lung disease, kidney or liver disease.

Subject has asthma, sleep apnea, or uses a CPAP. Subject has diabetes. Subject has a clotting disorder, anemia, or in the opinion of the investigator, they would be unsuitable for participation.

Subject has any other serious system illness. Subject is a current smoker. Subject has any injury, deformity, or abnormality at the sensor sites that, in the opinion of the investigator, would interfere with the sensors working correctly.

Subject has a history of fainting or vasovagal response. Subject has a sensitivity to local anesthesia. Subject has Raynaud's disease. Subject has unacceptable collateral circulation based on an exam by the investigator.

Subject is pregnant, lactating, or trying to get pregnant. Subject is unable or unwilling to provide informed consent or is unable or unwilling to comply with the study procedures.

Subject has any other condition, which in the opinion of the investigator, would make them unsuitable for the study.

Study Plan

How is the study designed?

Number of groups / cohorts

1

Cohorts and Interventions

Group / Cohort	Intervention / Treatment
Healthy Adult Volunteers; Minimum of ten (10) subjects meeting the eligibility criteria.	Device: Pulse oximeter; Devices (4) were placed on the finger and the fingertip of both index fingers. Blood samples were taken at each stable level of oxygenation.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
RMSE compared to arterial blood SaO2	Root Mean Squared Error between Movano Ring SpO2 measurement and the arterial blood SaO2 calibrated using arterial blood gas.	2 days

Collaborators and Investigators

• Sponsor: Movano Health
• Collaborators: University of California, San Francisco
• Investigators: Principal Investigator: Philip Bickler, MD, PhD, University of California at San Francisco (UCSF)

Study record dates

Study Major Dates

• Study Start (Actual): January 9, 2024
• Primary Completion (Actual): January 10, 2024
• Study Completion (Actual): January 10, 2024

Study Registration Dates

• First Submitted: October 20, 2023
• First Submitted That Met QC Criteria: October 20, 2023
• First Posted (Actual): October 26, 2023

Study Record Updates

• Last Update Posted (Actual): March 13, 2024
• Last Update Submitted That Met QC Criteria: March 11, 2024
• Last Verified: March 1, 2024

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Signs and Symptoms, Respiratory; Hypoxia
• Other Study ID Numbers: MOVA05

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: Yes
• product manufactured in and exported from the U.S.: No