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The Cassi Rotational Core Biopsy Device is indicated for use in obtaining biopsies from soft tissues such as liver, kidney, prostate, spleen, lymph nodes, and various soft tissue tumors. It is not intended for use in bone.

The Cassi Device is also indicated to provide breast tissue sampling of breast abnormalities. It is designed to provide breast tissue for histological examination with partial or complete removal of the imaged abnormality. The extent of a histological abnormality cannot be reliably determined from its mammographic appearance. Therefore, the extent of removal of the imaged evidence of an abnormality does not predict the extent of removal of a histological abnormality (e.g. malignancy). When the sampled abnormality is not histologically benign, it is essential that the tissue margins be examined for completeness of removal using standard surgical procedures.

The proposed CASSI II Rotational Core Biopsy System consists of the following primary components: a fully integrated CASSI biopsy handle, a valve block, battery, cryogen, a Cassi biopsy needle (CASSI biopsy needle comprised of a sticking needle and cutting cannula/piston assembly), and a sample collection tray. The sticking needle is operated by CASSI biopsy handle and uses cold temperatures at its tip to engage the tissue to be sampled. The cutting cannula is coaxially mounted around the sticking needle and is used to core the tissue specimen. The cutting cannula is available in two sizes (10 and 12 gauge).

The proposed CASSI biopsy handle are minor design evolution of the predicate CASSI II biopsy handle. The proposed CASSI II biopsy needle unit assembly remains unchanged from the predicate CASSI II biopsy needle unit assembly.

The proposed CASSI II system uses one control unit handle and allows for multiple, single patient use, biopsy needle units to operate with the handle, in the very same manner as the predicate CASSI II device. The principles of operation for the proposed CASSI™ II Rotational Core Biopsy System and the predicate CASSI II system remain unchanged.

The provided text is a 510(k) summary for the CASSI™ II Rotational Core Biopsy System, which focuses on changes to manufacturing and minor design evolutions rather than a study demonstrating clinical performance against acceptance criteria. Therefore, I cannot extract information related to clinical studies from this document.

However, based on the information provided, I can infer the following about the device's technical specifications and aspects addressed in the submission:

1. A table of acceptance criteria and the reported device performance:

Since this submission is for manufacturing and minor design changes, it does not present a table of clinical acceptance criteria and device performance in that context. The "performance" discussed relates to maintaining equivalence to the predicate device.

2. Sample size used for the test set and the data provenance (e.g., country of origin of the data, retrospective or prospective):

Not applicable to this 510(k) submission. This document describes manufacturing and minor design changes, not a clinical test set.

3. Number of experts used to establish the ground truth for the test set and the qualifications of those experts (e.g., radiologist with 10 years of experience):

Not applicable to this 510(k) submission. No clinical test set requiring expert ground truth establishment is described.

4. Adjudication method (e.g., 2+1, 3+1, none) for the test set:

Not applicable to this 510(k) submission. No clinical test set is described.

5. If a multi reader multi case (MRMC) comparative effectiveness study was done, If so, what was the effect size of how much human readers improve with AI vs without AI assistance:

Not applicable to this 510(k) submission. This device is a biopsy system, not an AI-assisted diagnostic tool.

6. If a standalone (i.e. algorithm only without human-in-the-loop performance) was done:

Not applicable to this 510(k) submission. This device is a biopsy system, not an algorithm.

7. The type of ground truth used (expert consensus, pathology, outcomes data, etc.):

Not applicable to this 510(k) submission. The document focuses on demonstrating that design and manufacturing changes do not alter fundamental performance or safety, rather than evaluating clinical accuracy against a ground truth.

8. The sample size for the training set:

Not applicable to this 510(k) submission. This device is not an AI/machine learning system.

9. How the ground truth for the training set was established:

Not applicable to this 510(k) submission. This device is not an AI/machine learning system.

In summary, this 510(k) submission (K161234) for the CASSI™ II Rotational Core Biopsy System focuses on demonstrating substantial equivalence to a previously cleared predicate device (K123606) following changes in contract manufacturers, sterilizer, and minor design evolutions to the biopsy handle, rather than presenting a clinical study and acceptance criteria for its diagnostic performance. The document confirms that the device's intended use and principles of operation remain unchanged and that the modifications do not raise new questions of safety or efficacy.

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