The Gore TAG stent graft used for endovascular aortic aneurysm repair procedures.
Unique features of the Bolton Relay-Plus are a bare metal stent proximally and spiral support strut along the graft to be aligned with the greater curve of the aorta. The stent-graft is available in 25 cm in both straight and tapered configurations, the longest on the market. Stent-grafts with diameters of 28 mm or less can be placed with proximal landing zones as short as 15 mm.
Cook Medical TX2
The TX2 was approved by FDA in May 2008. The device is indicated for endovascular repair of aneurysms (fusiform and saccular) and penetrating ulcers in descending thoracic aorta. This stent graft does not require a separate sheath and is contained within a proprietary Flexor introducer sheath. The device is advanced to the proximal landing zone and the stent-graft is partially unsheathed. The partially-deployed stent-graft can be repositioned by advancing proximally but not distally due to the presence of proximal fixation barbs. Completion of the sheath retraction is performed once desired position is achieved. The trigger-wires slowly releases the proximal trifold configuration for complete deployment.
The Cook TX2 device consists of a modular design with proximal and distal components. The proximal component has no uncovered stent but does have proximal barbs for fixation. The distal component has distal bare springs.
Cook Medical Zenith Alpha
The Zeith Alpha was approved by FDA for commercial use in September 2015. The device is indicated for aneurysm and penetrating ulcer in the descending thoracic aorta. Deployment is performed in a similar fashion as the Cook TX2 but the proximal portion of the graft is released by turning a rotation handle rather than direct unsheathing. The design is also modular. The proximal component has an uncovered stent (15 mm long) at the proximal end as well as fixation barbs. The distal component also has fixation barbs on the proximal end and uncovered stent on the distal end. The unique feature of this device is the low-profile delivery system (16 to 20 Fr sheaths), the smallest on the market.
Gore TAG Conformable
The TAG Conformable was approved by FDA in September 2013. The device is indicated for treatment of aneurysm, penetrating ulcer, blunt aortic injury and dissection. This device does require a separate sheath and the proprietary Gore Dry-Seal sheath is recommended. Deployment is single-staged and is performed by pulling a deployment string. The stent graft is release from the middle of the stent graft, towards either end simultaneously. This stent-graft is the only ePTFE graft on the market and has uncovered stent protruding proximally for improved fixation.
The Valiant was approved in January 2014. The device is indicated for treatment of aneurysm, penetrating ulcer, blunt aortic injury and dissection.
This stent-graft does not require a separate sheath. Deployment is performed by retracting a graft cover. The partially-deployed stent-graft can be repositioned distally but not proximally. After the stent-graft is deployed, the Captivia tip capture mechanism releases the proximal uncovered stent. The device is modular. The proximal component has an uncovered stent proximally.
Distal components are available in two configurations — either with covered or uncovered stents at the distal end. A unique feature is the availability of both proximal and distal components in straight and tapered configurations.
A comparison chart highlighting key characteristics of each stent-graft has been created to help the physician choose the appropriate device based on indication and anatomy. View the TEVAR Stent Grafts Comparison Chart (www.dicardiology.com/content/tevar-stent-grafts). It will require a login to access the specifications, but it is free and only takes a moment to complete the form.
Editor's Note: Andrei Churyla, M.D., is an assistant professor of cardiac surgery, and S. Chris Malaisrie, M.D., is an associate professor of cardiac surgery, division of cardiac surgery at Northwestern University. Malaisrie also is an attending cardiac surgeon at Northwestern Medicine, Bluhm Cardiovascular institute, and is co-director of the Marfan Clinic, Bicuspid Aortic Valve Clinic and Thoracic Aortic Surgery Program.
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