Transit Scientific is a development stage medical device company applying innovative design and technology (27 patents pending) to address unmet needs in the cardiovascular and vascular space. XO Score™ – Scoring Sheath A market-first scoring sheath that converts off-the-shelf* regular angioplasty balloons into scoring, cutting, and infusion vessel prep devices. XO Cross™ – Micro and Support Catheters Ultra low-profile one-piece metal alloy micro and support catheters that deliver class leading performance, specs, and cost-effectiveness XO Score™ and XO Cross™ are both FDA and CE Mark cleared for peripheral use..