SIS Medical announces publication of results of ISAR-CALC study for its high-pressure balloon catheter


SIS Medical has announced the publication of the ISAR-CALC—ComparIson of Strategies to PrepAre SeveRely CALCified Coronary Lesions—study in EuroIntervention, for its OPN-NC Super High Pressure PTCA Balloon for the treatment of calcified and highly calcified coronary stenosis.

The multicentre, randomised, open-label trial, involved 74 patients with severely calcified lesions enrolled in five clinics in Germany—Deutsches Herzzentrum,  Munich; Universitäts-Herzzentrum Freiburg-Bad Krozingen, Bad Krozingen; Herzzentrum Segeberger Kliniken, Bad Segeberg; Herzzentrum Leipzig at University of Leipzig, Leipzig—and one in Switzerland—Herzzentrum Luzerner Kantonsspital, Lucerne—and treated with different types of balloons.

The primary endpoint of the study was to compare the effects of the different types of balloons on stent expansion as assessed by optical coherence tomography (OCT), while the secondary endpoints included angiographic, strategic and procedural success. The results of the study show that in comparison to scoring balloons, the Super High Pressure Balloon achieved comparable and even improved stent expansion with more frequent strategic and procedural success, increased lumen diameter, reduced diameter stenosis and a significantly reduced need to use additional devices in order to complete the treatment.

Scoring balloons have a generally lower pressure resistance of 14‒18atm and a compliance which lies between semi-compliant and low-compliant balloons. When used, the wire-like metallic or polymer structure wrapped around the balloon is pressed into the calcified coronary wall with the aim of weakening calcium deposits. In the next step, the weakened calcium is broken up by using an additional non-compliant balloon. This increases both procedural costs and time, which also increases the risk for the patient. Based on the study results, the same effect can be achieved in a single step by applying the OPN-NC Super High Pressure Balloon with all the potential advantages as demonstrated by the study results.

The OPN-NC balloon features double balloon technology, providing a pressure resistance of over 30atm with a very low compliance, which allows it to break up calcium deposits without over-dilating the blood vessel. The study shows the latter as being one of the key advantages of the OPN-NC, as more lumen gain is achieved in the artery and minimal lumen diameter is increased significantly. This is an important factor in preventing future cardiac events. Another advantage lies in reduced stenosis diameter, which decreases the likelihood of re-interventions being necessary in the future, effectively improving patient quality of life.

“Compared to scoring balloons at lower pressures, the OPN-NC Super High Pressure Balloon shows improved efficacy and safety, which often constitutes a major issue in the treatment of  calcified lesions. During the ISAR-CALC study the test group for the OPN-NC Super High Pressure Balloon experienced no major adverse cardiac events at the 30-day mark. This confirms the safety profile of the OPN-NC balloon in daily practice”, says Heinz Joachim Büttner member of the Medical Advisory Board of SIS Medical AG, former Head of Interventional Cardiology at Universitäts-Herzzentrum Freiburg-Bad Krozingen, Bad Krozingen, Germany and founding member of the EuroCTO Club.

“The successful completion of the ISAR-CALC study is an important milestone in the short history of SIS Medical AG and the excellent results allow us to position our OPN-NC super high-pressure balloon as an effective alternative solution for indications in which scoring balloons are used today, or in all other cases of calcified or highly calcified lesions, in which an appropriate alternative interventional instrument is simply not available today. With this solid clinical data, we are well-prepared not only to compete with the scoring balloons of renowned manufacturers worldwide, but also to promote our Super High Pressure Balloon as an effective, safe and economically preferable solution”, says Sergej Kammerzell, CEO of SIS Medical AG.


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