Cardiovascular Systems, Inc. Completes Enrollment of ECLIPSE Clinical Trial

Largest randomized coronary atherectomy trial ever conducted

Cardiovascular Systems, Inc. (CSI) (NASDAQ:CSII), a medical device company developing and commercializing innovative interventional treatment systems for patients with peripheral and coronary artery disease, announced today the company completed the enrollment of its 2,000 patient ECLIPSE coronary trial.

ECLIPSE is a prospective, multi-center, randomized clinical trial of approximately 2,000 subjects with severely calcified coronary lesions in the United States. Half of the participants received orbital atherectomy prior to drug-eluting stent implantation, while the other half received conventional angioplasty, including specialty balloons, followed by DES implantation. The trial is powered to demonstrate differences in the primary endpoints of post-procedural in-stent minimal cross-sectional area (assessed by Optical Coherence Tomography (OCT) imaging in a subset of approximately 400 patients), as well as in the clinical outcome of target vessel failure at one year. ECLIPSE will also evaluate key health economic outcomes.

Results from ECLIPSE are expected to be shared in the fall of 2024.

Jeffrey W. Chambers, M.D., CSI's Chief Medical Officer, said, "ECLIPSE is important because it tests two treatment strategies for managing one of the most difficult challenges for interventional cardiologists. We believe the data from this study will be beneficial in defining an optimal treatment plan for patients with severely calcified coronary arteries."

About Coronary Artery Disease (CAD)

CAD is a life-threatening condition and a leading cause of death in men and women globally. CAD occurs when a fatty material called plaque builds up on the walls of arteries that supply blood to the heart. The plaque buildup causes the arteries to harden and narrow (atherosclerosis), reducing blood flow. The risk of CAD increases if a person has one or more of the following: high blood pressure, abnormal cholesterol levels, diabetes, or family history of early heart disease. According to the Centers for Disease Control and Prevention, 18 million people in the United States have CAD, the most common form of heart disease. Heart disease claims more than 650,000 lives in the United States each year. According to estimates, arterial calcium is present in 38 percent of patients undergoing a PCI. Significant calcium contributes to poor stent delivery, expansion and wall apposition leading to poor outcomes and higher treatment costs in coronary interventions when traditional therapies are used, including a significantly higher occurrence of death and major adverse cardiac events (MACE).

About Cardiovascular Systems, Inc.

Cardiovascular Systems, Inc., based in St. Paul, Minn., is a medical device company focused on developing and commercializing innovative solutions for treating vascular and coronary disease. The company's orbital atherectomy system treats calcified and fibrotic plaque in arterial vessels throughout the leg and heart and addresses many of the limitations associated with existing surgical, catheter and pharmacological treatment alternatives. For more information, visit www.csi360.com and follow us on LinkedIn and Twitter.

Safe Harbor

Certain statements in this news release are forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 and are provided under the protection of the safe harbor for forward-looking statements provided by that Act. For example, statements in this press release regarding the ECLIPSE clinical trial, including expected outcomes and the timing of sharing of the results, are forward-looking statements. These statements involve risks and uncertainties that could cause results to differ materially from those projected, including, but not limited to, actual clinical study results, the timing of compilation and reporting of results, and other factors detailed from time to time in CSI's SEC reports, including its most recent annual report on Form 10-K and subsequent quarterly reports on Form 10-Q. CSI encourages you to consider all of these risks, uncertainties and other factors carefully in evaluating the forward-looking statements contained in this release. As a result of these matters, changes in facts, assumptions not being realized or other circumstances, CSI's actual results may differ materially from the expected results discussed in the forward-looking statements contained in this release. The forward-looking statements made in this release are made only as of the date of this release, and CSI undertakes no obligation to update them to reflect subsequent events or circumstances.

Product Disclosure:

Coronary Product

Indications: The Diamondback 360^® Coronary Orbital Atherectomy System (OAS) is a percutaneous orbital atherectomy system indicated to facilitate stent delivery in patients with coronary artery disease (CAD) who are acceptable candidates for PTCA or stenting due to de novo, severely calcified coronary artery lesions.

Contraindications: The OAS is contraindicated when the ViperWire^® guide wire cannot pass across the coronary lesion, or the target lesion is within a bypass graft or stent. The OAS is contraindicated when the patient is not an appropriate candidate for bypass surgery, angioplasty, or atherectomy therapy, or has angiographic evidence of thrombus, or has only one open vessel, or has angiographic evidence of significant dissection at the treatment site and for women who are pregnant or children.

Warnings/Precautions: Performing treatment in excessively tortuous vessels or bifurcations may result in vessel damage; The OAS was only evaluated in severely calcified lesions, A temporary pacing lead may be necessary when treating lesions in the right coronary and circumflex arteries; On-site surgical back-up should be included as a clinical consideration; Use in patients with an ejection fraction (EF) of less than 25% has not been evaluated.

See the instructions for use for detailed information regarding the procedure, indications, contraindications, warnings, precautions, and potential adverse events. For further information call CSI at 1-877-274-0901 and/or consult CSI's website at www.csi360.com.

Caution: Federal law (USA) restricts these devices to sale by or on the order of a physician.

The Diamondback 360^® Coronary OAS is FDA PMA approved and CE Marked.

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