Direct Flow to begin U.S. trials at prominent hospitals

SANTA ROSA -- Direct Flow Medical, Inc. has started the first patient enrollment study in the U.S.  for its Aortic Heart Valve System that treats aortic regurgitation, which could significantly lessen the need for open-heart surgery on certain patients.

The Santa Rosa-based developer of transcatheter heart valves, founded in 2004, has developed an aortic valve with a "metal-free frame and flexible, low-profile delivery system," which differs from traditional aortic heart valve replacement that often requires highly invasive open-heart surgery.

The trial will follow 30 patients at six medical centers throughout the country:  UC, Davis Medical Center, Columbia University Medical Center in New York, Henry Ford Hospital in Detroit, the Cleveland Clinic, Washington University Hospital in St. Louis and Northwestern University Hospital in Chicago.

Boston Scientific and Edwards LifeSciences are working on similar aortic valves. So far, Edwards Lifesciences has undertaken the U.S.  Pivotal Trial and its valve is commercially available in the U.S. Boston Scientific has not yet reach the U.S. clinical trial stage,  a key step before obtaining Food and Drug Administration approval, according to Dr. Charles Davidson, a consultant for Direct Flow and clinical chief of cardiology at Northwestern.

Direct Flow has received $75 million in venture capital.

Dr. Davidson likened the advancement in aortic valves to that of heart stents, which were widely hailed when they first rolled out but evolved quickly to become drug-eluting stents that better addressed certain clinical issues. Likewise with aortic valves, Direct Flow's device helps correct some issues associated with current commercial valves and patients with aortic stenosis, he said.

"The first-generation devices were revolutionary in treating patients with severe aortic stenosis," Dr. Davidson said. "Those were really kind of groundbreaking and set the stage for a whole new treatment of patients. It's a disease not well treated with medicine. But there were certain limitations with those devices. One of them was there was significant leaking around the valve, called aortic regurgitation. And that leaking has led to an increase in death after the procedure."

Aortic stenosis is a congenital condition where the opening of the aortic valve is narrowed, which decreases blood flow from the heart to the rest of the body.

Another issue with current available valves, Dr. Davidson said, is that once implanted, they're nearly impossible to retrieve or replace.

"You basically had to leave it in the patient," Dr. Davidson said. "The next generation valves and Direct Flow really address those issues. It virtually eliminated aortic regurgitation," and related vascular and bleeding complications.


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