Cleared Traditional

K905691 - QDR-1000 AND WITH X-RAY BONE DENSITOMETER (FDA 510(k) Clearance)

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

K905691 · Hologic, Inc. · Radiology device
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May 1991
Decision
147d
Days
Class 2
Risk

K905691 is an FDA 510(k) clearance for the QDR-1000 AND WITH X-RAY BONE DENSITOMETER. Classified as Densitometer, Bone (product code KGI), Class II - Special Controls.

Submitted by Hologic, Inc. (Waltham, US). The FDA issued a Cleared decision on May 15, 1991 after a review of 147 days - within the typical 510(k) review window.

This device falls under the Radiology FDA review panel, regulated under 21 CFR 892.1170 - the FDA radiology and imaging software oversight 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. Standard predicate reliance. This clearance follows a standard predicate-based equivalence path within the Radiology review framework, consistent with the majority of Class II 510(k) submissions.

View all Hologic, Inc. devices

Submission Details

510(k) Number K905691 FDA.gov
FDA Decision Cleared Substantially Equivalent - Traditional 510(k) (SESE)
Date Received December 19, 1990
Decision Date May 15, 1991
Days to Decision 147 days
Submission Type Traditional
Review Panel Radiology (RA)
Summary -
Third-party Review No - reviewed directly by FDA
Regulatory Context
Review time vs. panel average
40d slower than avg
Panel avg: 107d · This submission: 147d
Pathway characteristics
Predicate-based equivalence. No clinical trials required.

Device Classification

Product Code KGI Densitometer, Bone
Device Class Class 2 - Special Controls
CFR Regulation 21 CFR 892.1170
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 Radiology devices follow this clearance model.

Regulatory Peers - KGI Densitometer, Bone

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