Cleared Traditional

K954492 - MERCURY MEDICAL EXPIRATORY RESISTANCE EXERCISER, RESISTEX (FDA 510(k) Clearance)

Class II Anesthesiology device cleared through predicate-based substantial equivalence - typically does not require clinical trials.

K954492 · Mercury Medical · Anesthesiology device
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Oct 1996
Decision
390d
Days
Class 2
Risk

K954492 is an FDA 510(k) clearance for the MERCURY MEDICAL EXPIRATORY RESISTANCE EXERCISER, RESISTEX. Classified as Spirometer, Therapeutic (incentive) (product code BWF), Class II - Special Controls.

Submitted by Mercury Medical (Clearwater, US). The FDA issued a Cleared decision on October 21, 1996 after a review of 390 days - an unusually long review period, suggesting complex equivalence evaluation.

This device falls under the Anesthesiology FDA review panel, regulated under 21 CFR 868.5690 - the FDA anesthesiology and respiratory device framework. The Traditional 510(k) pathway establishes clearance through substantial equivalence to a legally marketed predicate device, without requiring clinical trial data.

Device pattern: Standard predicate-based submission. Elevated predicate reliance profile. This clearance follows a standard predicate-based equivalence path within the Anesthesiology review framework, consistent with the majority of Class II 510(k) submissions.

View all Mercury Medical devices

Submission Details

510(k) Number K954492 FDA.gov
FDA Decision Cleared Substantially Equivalent - Traditional 510(k) (SESE)
Date Received September 27, 1995
Decision Date October 21, 1996
Days to Decision 390 days
Submission Type Traditional
Review Panel Anesthesiology (AN)
Summary Summary PDF
Third-party Review No - reviewed directly by FDA
Regulatory Context
Review time vs. panel average
251d slower than avg
Panel avg: 139d · This submission: 390d
Pathway characteristics
Predicate-based equivalence. No clinical trials required.

Device Classification

Product Code BWF Spirometer, Therapeutic (incentive)
Device Class Class 2 - Special Controls
CFR Regulation 21 CFR 868.5690
What this classification means

Class II devices require demonstration of substantial equivalence to a legally marketed predicate device. This pathway does not require clinical trials - it relies on engineering equivalence and performance data. Most Anesthesiology devices follow this clearance model.

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