After three years of clinical research, Royal Philips NV said its Tack (4-F) endovascular system has shown promising results for arterial dissection repair following balloon angioplasty in patients with critical limb ischemia and infrapopliteal arterial occlusive disease. The data was collected from a 36-month follow-up in the Tack Optimized Balloon Angioplasty (TOBA) II below-the-knee clinical trial.