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The Inter-Os Limb Lengthener is an implantable device for distraction osteogenesis techniques in the femur. The Inter-Os Limb Lengthener is used to treat conditions for limb length deficiencies involving the femur. The types of deformities that fall into this category are:

Traumatic deformities, growth deformities, deformities secondary to tumors and infections, and congenital deformities.

The Inter-Os Limb Lengthener is intended to be used in the upper leg bones of the appendicular skeleton. The Limb Lengthener is not intended to be used for the spine.

The Inter-Os Limb Lengthener is intended for single use and is not meant for repeat sterilization and implantation. The device is to be removed after consolidation of the bone is complete. It is to be used with other commercially-available accessory devices, such as bone screws for fixation to the bone surface. Bone cement is not to be used to fixate the device to the bone; however, commercially-available bone cement may be used on the undersurface of the device to level or stabilize it on a curved surface, or bone cement may also be used to fix the gear in position during the consolidation period.

The Inter-Os Limb Lengthener is an implantable device used to treat conditions where bone length is deficient. It is used for distraction osteogenesis techniques in the femur and is intended to be implanted by orthopedic surgeons. The device is removed after distraction is complete. It features two telescoping component bone plates that are distracted apart by a threaded drive shaft. Activation of the drive shaft is by means of a transcutaneous pin, which may be removed once the distraction phase is complete. The Activation Pin and the drive shaft are articulated using an internal gear.

All of the components of the Inter-Os Limb Lengthener are fabricated from stainless steel. The Inter-Os Limb Lengthener is intended to be sold non-sterile. It is a singleuse device. Sterilization instructions are included in the labeling.

The provided document does not contain information about acceptance criteria or a study proving the device meets acceptance criteria in the manner typically associated with AI/ML device performance studies (e.g., sensitivity, specificity, AUC). This document is a 510(k) summary for a medical device (Inter-Os Limb Lengthener) which focuses on demonstrating substantial equivalence to predicate devices, primarily through descriptive characteristics, intended use, principle of operation, and mechanical testing.

Here's a breakdown of the requested information based on the provided text, highlighting what is present and what is absent:

1. Table of Acceptance Criteria and Reported Device Performance

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

• Sample Size for Test Set: Not applicable/Not mentioned. The study is described as mechanical testing and literature review, not a clinical study with a patient "test set."
• Data Provenance: Not applicable/Not mentioned.

3. Number of Experts Used to Establish Ground Truth and Qualifications

• Not applicable. This device's performance demonstration does not involve establishing ground truth through expert review in the context of diagnostic accuracy.

4. Adjudication Method for the Test Set

• Not applicable. There is no clinical "test set" requiring adjudication.

5. Multi-Reader Multi-Case (MRMC) Comparative Effectiveness Study

• Was one done? No.
• Effect size of human readers with vs. without AI assistance: Not applicable, as this is not an AI/ML device.

6. Standalone (Algorithm Only) Performance Study

• Was one done? No. This device is not an algorithm, but a physical implantable medical device.

7. Type of Ground Truth Used

• Not applicable. The performance is assessed through mechanical tests against "standard testing guidelines for equivalent devices" and "literature review," implying a comparison to established benchmarks for physical device performance rather than clinical ground truth for diagnostic accuracy.

8. Sample Size for the Training Set

• Not applicable. This is a physical device, not an AI/ML algorithm requiring a training set.

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

• Not applicable.

Summary of the Study that Proves the Device Meets Acceptance Criteria:

The study proving the device meets acceptance criteria, as described in the 510(k) summary, is primarily based on:

1. Mechanical Testing: The document states, "Performance has been substantiated by mechanical tests in conformity to standard testing guidelines for equivalent devices." This indicates that the physical properties and functionality of the Inter-Os Limb Lengthener were evaluated in a laboratory setting to ensure they met established engineering and safety standards applicable to similar bone fixation devices.
2. Literature Review: The submission also mentions "literature review" as a basis for substantiating performance. This typically involves reviewing published scientific and clinical data related to the predicate devices and the principles of distraction osteogenesis to support the safety and effectiveness claims.
3. Substantial Equivalence Argument: The core of the 510(k) involves demonstrating that the Inter-Os Limb Lengthener is "substantially equivalent" to legally marketed predicate devices in terms of design, materials, function, and intended use. The conclusion explicitly states, "Based on the design, materials, function, intended use, the Inter-Os Limb Lengthener is substantially equivalent to the devices currently marketed... The Inter-Os Limb Lengthener raises no new safety or effectiveness issues."

In essence, the "acceptance criteria" for this device's 510(k) clearance were met by proving that its physical performance through mechanical testing aligns with standards for similar devices and that its characteristics are substantially equivalent to already cleared devices, thereby assuring its safety and effectiveness. This is distinct from the type of performance evaluation required for AI/ML-based diagnostic devices.

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