Cardiovascular Systems enrols first patient in Japan for KAIZEN clinical study

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Diamondback 360

Cardiovascular Systems Inc (CSI) recently announced initiation of the KAIZEN clinical study of its Diamondback 360 peripheral orbital atherectomy system (OAS) for the treatment of calcified plaque in patients with peripheral arterial disease (PAD). The study is intended to support regulatory approval in Japan.

The first KAIZEN patient was enrolled by Tatsuya Nakama at Tokyo Bay Urayasu Ichikawa Medical Center (Urayasu, Japan).

Nakama said: “I felt that the Diamondback 360 peripheral OAS offered both effective treatment and ease of use. I was able to observe significant vessel compliance change, which permitted satisfactory balloon expansion at low pressure. Additionally, I felt that minimal distal embolism compared to other devices throughout the procedure was greatly comforting. I look forward to further evaluation of the device, but believe it will be seen as a highly welcomed tool in the battle against calcified vessels.”

CSI notes that the Diamondback 360 peripheral OAS is a minimally invasive, single-use, catheter-based device that is designed to differentiate between hard, diseased plaque and healthy, compliant arterial tissue. The OAS orbiting crown reduces and modifies calcified plaque while preserving the healthy vessel wall in order to restore blood flow, the company claims.

KAIZEN is a prospective, single-arm, multicentre study led by Hiroyoshi Yokoi (Fukuoka Sanno Hospital, Fukuoka, Japan). The study is designed to evaluate the safety and efficacy of CSI’s Diamondback 360 peripheral OAS in the treatment of de novo symptomatic calcified occlusive atherosclerotic lesions in the superficial femoral artery and/or popliteal artery. According to CSI, OAS has demonstrated safety and efficacy in the US population and this study is designed to confirm this in Japan. The study is expected to enrol up to 100 subjects at up to 12 study sites.

Yokoi said: “Severely calcified peripheral vessels continue to be a significant challenge for both patient and caregiver, and the need for new treatment devices is greater than ever. I believe the Diamondback 360 peripheral OAS has great potential for this underserved patient population, and I look forward to evaluating it in Japan. In addition, the high use of imaging by practitioners in Japan will provide greater insight into lesion morphology, and I am confident that this will also help us optimise treatment and safety using OAS.”

Scott R Ward, CSI’s chairman, president and chief executive officer, said: “We look forward to completing KAIZEN and working with the investigators and regulators so that we may offer peripheral OAS therapy to physicians in Japan.”


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