 Authors conclude, Compared to TTS clip, X-Tack is superior for effecting large mucosal defect closure, including durable sealing of full-thickness perforation. AUSTIN, TX ACCESSWIRE April 21, 2021 Apollo Endosurgery, Inc. Apollo Nasdaq:APEN, a global leader in minimally invasive medical devices for gastrointestinal and bariatric procedures, announced the publication of supporting pre-clinical results for the X-TackTM Endoscopic HeliX Tacking System. 