Gore has announced the Health Canada approval of the Tigris vascular stent, a dual-component stent with a unique fluoropolymer/nitinol design. The device, which gained CE mark approval in 2011, is a third generation, self-expanding stent. The device was designed explicitly to improve anatomical conformability with the natural movement of the knee when treating peripheral artery disease (PAD).
The newly-approved Tigris stent uses a dual component structure, made from a single-wire nitinol stent with flexible and biocompatible fluoropolymer interconnections. The stent has been designed to weather biomechanical forces (extension, compression, flexion, and torsion) without fractures, even in the most complex anatomies, namely in the superficial femoral artery (SFA) and popliteal arteries. In the US clinical study that supported US Food and Drug Administration (FDA) approval of the stent, the Tigris was found to have zero fractures at 12 months, while the control arm devices experienced a 27% fracture rate at the same time point.
The new device builds on the company’s long history and experience with stenting, which spans more than two decades. The Tigris stent also features Gore’s CBAS heparin surface, the proven, lasting heparin bonding technology designed to resist thrombus formation, a problem common in both bare metal and drug-eluting stents. End-point covalent bonding keeps heparin anchored to the stent surface, while the bioactive site remains free to interact with the blood to help prevent clotting.
“At Gore, we pride ourselves in continuous evaluation of how our technologies can benefit patients. To design an uncovered stent that navigates and conforms to the complex anatomy of the artery, we leveraged our long history with endovascular devices to develop the Tigris vascular stent. The addition of this device to our peripheral interventional portfolio enables physicians to treat more diverse cases with Gore’s best in class products,” said Ray Swinney, business unit leader for the Gore Peripheral Interventional Business Unit.
The evolution of peripheral stenting over the past decade has allowed for broader adoption of endovascular therapy for treating PAD. When physicians began placing stents in the SFA, they were limited by first-generation stent designs that had longitudinal metal connections which led to arterial stiffening, high fracture rates and poorer clinical outcomes. Improvements in second-generation devices introduced helical interconnections to improve flexibility; however, their success in high flexion vessels, like the distal SFA and proximal popliteal artery, was still limited. The introduction of third-generation stents, including the Tigris stent, allow for better adherence in some of the more intricate vessels in the body, a Gore press release says.