New Reusable Mask Design With Superior Filtration and Fit

Not Applicable

Completed

• Conditions: Covid19; Tuberculosis; Respiratory Viral Infection
• Interventions: Device: N95 mask; Device: Nordell single E-100 layer mask; Device: Nordell double E-100 layer mask

• Registration Number: NCT04826809
• Lead Sponsor: Mayo Clinic

Brief Summary

This study will test the filtration, air leak, and breathability of a newly designed fully washable mask developed by Dr. Nordell with the Mayo Clinic. This mask is theorized to be a superior alternative to other respirators currently used when one-time-use N95 masks are unavailable.

Detailed Description

The purpose of this study is to determine potential effectiveness of a new, reusable mask against SARS-CoV-2 and other microbes. This requires filtering down to at least 0.3 microns, as the SARS-CoV-2 virus is on average 0.25-0.5 microns in diameter.

Dr. Nordell has developed a machine-washable mask which shows potential to be significantly more effective than other masks on the market. It uses a fabric that is machine washable, without need for a filter or replaceable component. This fabric, Evolon-100 or E-100, is a microfilament fabric produced by a private company outside of the USA (and is therefore not yet FDA approved as of December 2020).

Unofficial data shows this mask passes the "N95 fit test" before and after multiple washes on the majority of individuals tested, and the material used in Dr. Nordell's design filters 93-96% of 0.3 micron particles. For reference, the N95 mask used in the hospital (whenever concern for potential exposure to COVID-19 or similar contagion exists) filters 95% of 0.3 micron particles when factoring in air leak, assessed with the "fit test." Voluntary survey of users also shows it is more comfortable than other masks, including the N95. This mask is also reported to be breathable even after prolonged use.

This mask design addresses every factor in respirator design. The design intentionally uses pleats to increase the effective mask surface area while decreasing the seal perimeter, resulting in increased air flow, lower pressure drop, and increased filtration efficiency. The investigators propose that it has a higher filtration ability than other washable fabrics tested, filtering at least 93% of 0.3 micron particles, even up to 96%. It also helps prevent air leak, a large factor limiting efficacy of most non-standard masks. It is easy to don and doff, and it is very easy to clean and disinfect. This material can be washed multiple times in a standard washing machine without reducing its effectiveness. And finally, it is very affordable, with materials for one mask costing less than $1.50. All materials used beyond this specific fabric are easily purchased on the internet or in a fabric store.

Upon completion of this research, the investigators hope to demonstrate that this mask is a superior alternative in multiple settings, including hospitals in developing countries with little or no N95 mask access, non-hospital settings such as businesses and schools, as well as for the general population, especially those with high risk for COVID-related complications.

Study Timeline

• Study First Submitted: 2021-03-18
• Study First Submitted QC: 2021-03-30
• Study First Posted: 2021-04-01
• Study Start: 2021-04-09
• Primary Completion: 2022-10-27
• Study Completion: 2022-10-27
• Status Verified: 2023-06
• Results First Submitted: 2023-06-15
• Results First Submitted QC: 2023-06-15
• Last Update Submitted: 2023-06-15
• Results First Posted: 2023-07-07
• Last Update Posted: 2023-07-07

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 41

Inclusion Criteria

• Current employee of Mayo Clinic Health System-Mankato
• Passed N95 fit test within the past year
• No medical history of: high blood pressure, current or recent pneumonia or upper respiratory infection, and no uncontrolled chronic asthma
• Ideally with wide representation of genders, race, age, BMI, occupation/role in hospital.
• Willing and able to provde verbal consent.

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Exclusion Criteria

• History of uncontrolled asthma, pneumonia, or hypertension.

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
Health care workers	Nordell single E-100 layer mask	Health care workers will complete a fit test while wearing the Nordell Single E-100 layer + (cotton layer) mask, Nordell Double E-100 layer mask and an N95 mask
Health care workers	Nordell double E-100 layer mask	Health care workers will complete a fit test while wearing the Nordell Single E-100 layer + (cotton layer) mask, Nordell Double E-100 layer mask and an N95 mask
Health care workers	N95 mask	Health care workers will complete a fit test while wearing the Nordell Single E-100 layer + (cotton layer) mask, Nordell Double E-100 layer mask and an N95 mask

Primary Outcome Measures

Name	Time	Method
Comfort Level of Nordell Double E-100 Layer Mask	Baseline	Measured by a self-reported questionnaire that rates the comfort level of the Nordell Double E-100 layer mask on a scale from 0 to 5 (0 is the most uncomfortable mask ever worn, 5 is the best, most comfortable mask)
Comparison of Fit Tests	Baseline	Number of participants to pass the respirator fit testing using Bitrix solution. If participants do not smell or taste the solution while wearing the respirator it is considered passed.
Ability to Breathe With Nordell Double E-100 Layer Mask	Baseline	Measured by a self-reported questionnaire that rates ability to breathe comfortably while wearing the Nordell Double E-100 Layer Mask, from 0 (not able to breathe at all) to 5 (just as easy to breathe as not wearing any mask)

Trial Locations

Locations (1)

Mayo Clinic Health System in Mankato; 🇺🇸 Mankato, Minnesota, United States