# Spacer, Direct Patient Interface
> **Product code: NVO** · Class II — Moderate Risk (510(k) clearance required) · Anesthesiology · 21 CFR 868.5630
## Classification
- **FDA Product Code:** NVO
- **Device class:** Class II — Moderate Risk (510(k) clearance required)
- **Regulation:** 21 CFR 868.5630
- **Review panel:** AN
- **Medical specialty:** Anesthesiology
- **Submission type:** 1
- **GMP exempt:** N
- **Life sustaining:** N
- **Implant:** N
- **Third-party review:** N
## Definition

Spacers are devices that are used with nebulizers and metered dose inhalers that are comprised of a reservior into which an aerosol medication is dispensed.  A spacer uses an open mouthpiece.  Spacers are intended to minimize delivery of large aerosolized particles.

## Market data
- **Cleared 510(k) submissions:** 2
- **Registered establishments:** 3
## Source
- [FDA Device Classification](https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfpcd/classification.cfm?ID=NVO)
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