Cleared Traditional

K921309 - MODEL 508 PATIENT MONITOR

K921309 is an FDA 510(k) clearance for MODEL 508 PATIENT MONITOR, manufactured by Criticare Systems, Inc.. The device is a Class 2 Anesthesiology device with product code BTY cleared through the Traditional 510(k) pathway after a 647-day FDA review.

K921309 · Criticare Systems, Inc. · Anesthesiology device
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Dec 1993
Decision
647d
Days
Class 2
Risk

K921309 is an FDA 510(k) clearance for the MODEL 508 PATIENT MONITOR. Classified as Calculator, Predicted Values, Pulmonary Function (product code BTY), Class II - Special Controls.

Submitted by Criticare Systems, Inc. (Milwaukee, US). The FDA issued a Cleared decision on December 17, 1993 after a review of 647 days - an unusually long review period, suggesting complex equivalence evaluation.

This device falls under the Anesthesiology FDA review panel, regulated under 21 CFR 868.1890 - 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: High-complexity regulatory submission. Elevated predicate reliance profile. The extended review timeline suggests the FDA required additional documentation before confirming substantial equivalence - a pattern common in complex or first-of-kind Anesthesiology submissions.

View all Criticare Systems, Inc. devices

FDA 510(k) Submission Details - K921309

510(k) Number K921309 FDA.gov
FDA Decision Cleared Substantially Equivalent - Traditional 510(k) (SESE)
Date Received March 10, 1992
Decision Date December 17, 1993
Days to Decision 647 days
Submission Type Traditional
Review Panel Anesthesiology (AN)
Summary Statement
Third-party Review No - reviewed directly by FDA
Combination Product No
PCCP Authorized No
Regulatory Context
Review time vs. panel average
507d slower than avg
Panel avg: 140d · This submission: 647d
Pathway characteristics
Predicate-based equivalence. No clinical trials required.

BTY Device Classification - Class 2, Special Controls

Product Code BTY Calculator, Predicted Values, Pulmonary Function
Device Class Class 2 - Special Controls
CFR Regulation 21 CFR 868.1890
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.

Regulatory Peers - BTY Calculator, Predicted Values, Pulmonary Function

All 17
Devices cleared under the same product code (BTY) and FDA review panel - the closest regulatory comparables to K921309.
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K864836 · Timeter Instrument Corp. · Mar 1987
SPIROMETRY MODULE
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PFT SCREENER (SYSTEM 1100)
K812792 · Medical Graphics Corp. · Nov 1981