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The Mark III Phased Array Shoulder Coil is a receive-only phased array RF coil, used for obtaining diagnostic images of the shoulder and adjacent regions in Magnetic Resonance Imaging systems. The indications for use are the same as for standard MR Imaging. The Mark III Phased Array Coil is designed for use with the Signa EXCITE 3T MRI scanner manufactured by GE Medical Systems, Inc.

The Mark III Phased Array Coil consists of three volume RF coil elements in a phased array design. The coil elements and associated circuitry are enclosed to prevent any exposure to the patient or environment. The coil electronics are enclosed in both the rigid housing and the vinyl coated PVC foam. The coil is positioned on the patient's shoulder during imaging.

The provided text describes a Special 510(k) Premarket Notification for the Mark III Phased Array Shoulder Coil. This type of submission typically focuses on demonstrating substantial equivalence to a predicate device, rather than providing extensive de novo clinical or performance study data with defined acceptance criteria in the same way a new, high-risk device might. The document submitted for K042009 is a Traditional 510(k), which is typically for new devices. However, the internal title indicates 'Special 510(k)', which refers to an easier route for devices that are modifications to one's own legally marketed devices.

Therefore, the information you've requested regarding acceptance criteria, study details, sample sizes, expert qualifications, and ground truth establishment is not present in the provided document. The 510(k) submission primarily relies on comparisons to legally marketed predicate devices to establish safety and effectiveness.

Here's an analysis of what is available and what is explicitly missing:

1. Table of Acceptance Criteria and Reported Device Performance

Missing Information: Specific quantitative performance metrics (e.g., signal-to-noise ratio, image resolution, specific absorption rate (SAR) limits) that the device must meet, and corresponding test results to prove these metrics are met. The document states "power deposition during imaging is limited by SAR algorithm", but doesn't specify the accepted SAR limits or the measured SAR of the device.

2. Sample Size Used for the Test Set and Data Provenance

Missing Information: The document does not describe a "test set" in the context of clinical or performance data generation. The submission relies on a comparison to predicate devices, not independent testing on a new dataset.

3. Number of Experts Used to Establish Ground Truth for the Test Set and Qualifications

Missing Information: Not applicable. No test set requiring expert ground truth is described.

4. Adjudication Method for the Test Set

Missing Information: Not applicable. No test set requiring adjudication is described.

5. If a Multi-Reader Multi-Case (MRMC) Comparative Effectiveness Study Was Done

Missing Information: No MRMC study is described. The submission focuses on technical equivalence rather than clinical comparative effectiveness.

6. If a Standalone Performance Study Was Done (Algorithm Only Without Human-in-the-Loop Performance)

Missing Information: Not applicable. This device is a passive RF coil, not an algorithmic device requiring standalone performance testing in that sense. The 'performance' is implied by its design similarity to predicate devices.

7. The Type of Ground Truth Used

Missing Information: Not applicable. No new ground truth needed to be established for this submission, as it relies on the established safety and effectiveness of predicate devices.

8. The Sample Size for the Training Set

Missing Information: Not applicable. This device is a hardware component, not an AI/ML algorithm that requires a training set.

9. How the Ground Truth for the Training Set Was Established

Missing Information: Not applicable. No training set is described.

Summary of the Study/Evidence Provided:

The "study" presented in this 510(k) notification is primarily a direct comparison of the Mark III Phased Array Shoulder Coil to legally marketed predicate devices. The manufacturer, USA Instruments, Inc., established substantial equivalence by demonstrating that their new coil has:

• Similar Intended Use: Shoulder imaging applications.
• Similar Indications for Use: Identical to routine MRI imaging.
• Similar Design Principles: Receive-only phased array design, decoupling methods (switching diode decoupling), and methods for preventing RF burns (does not transmit RF power, coil elements isolated and enclosed in non-conductive housing).
• Similar Materials: Coil enclosure materials (Vinyl coated PVC foam, Flame retardant Polyurethane Plastic, PVC Plastic).

Predicate Devices Used for Comparison:

• Mark 9000 Shoulder Coil manufactured by USA Instruments Inc. (K010946)
• Phased Array Shoulder Coil manufactured by Medical Advances Inc. (K945778)
• Magna 5000 Phased Array CTL Spine Coil manufactured by USA Instruments, Inc. (K994345) (for enclosure materials)
• Excalibur 9000 TotalSENSE™ Quad Array-Head Coil manufactured by USA Instruments, Inc. (K022582) (for prevention of RF burns)

The safety and effectiveness argument is built upon the premise that because the Mark III Phased Array Shoulder Coil shares fundamental design characteristics, intended use, and indications for use with other legally marketed devices, it can be considered equally safe and effective. The FDA's letter concurs with this determination of substantial equivalence.

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