XO SCORE® and XO CROSS® are FDA Cleared



With off-the-shelf PTA balloons


A market-first, ultra-low-profile, metal alloy scoring sheath designed to convert off-the-shelf PTA balloon catheters into scoring
and infusion systems.
Ultra-low-profile one-piece metal alloy micro and support catheters that deliver class-leading performance and specs.



Increasingly complex interventions and advanced PAD disease states in require novel technologies and tools to improve the quality of care for patients. The XO Score and XO Cross platforms have been designed and optimized for dilatation and access of tough calcified lesions in the peripheral vasculature.


A high rate of arteriovenous fistulas and grafts fail due to excessive intimal hyperplasia-related stenoses. Dialysis interventions often require extreme high-pressure angioplasty to salvage access sites and restore flow. XO Score was designed to effectively dilatate tough, fibrous lesions encountered during fistula and graft maintenance.


Posted on August 18, 2020

Feature Article: Transit Scientific's XO Cross Microcatheters see first use

Posted on August 17, 2020

Press Release: Transit Scientific

Announces first XO Cross cases

Posted on August 17, 2020

XO Cross Microcatheter: First Procedures Performed

Posted on August 17, 2020

Transit Scientific's XO Cross 14 Microcath First Clinical Use

Posted on August 17, 2020

First Cases Performed with XO Cross Catheter Platform

Posted on August 17, 2020

First Worldwide Cases Performed with XO Cross 14 Microcath

Posted on August 17, 2020

First Worldwide Clinical Use of the XO Cross 14 Microcatheter

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The XO Score™ Sheath Platform is FDA 510(k) cleared to be used in conjunction with a PTA balloon to facilitate dilation and apposition of the scoring surface to the stenotic material in the iliac, femoral, ilio-femoral, popliteal, infra-popliteal, and renal arteries; and for treatment of obstructive lesions of native or synthetic arteriovenous dialysis fistulae. Not for use in the coronary or neuro-vasculature. The XO Cross™ Catheter Platform is also FDA 510(k) cleared to be used to guide and support a guidewire during access of the peripheral vasculature, allow for wire exchanges and provide a conduit for the delivery of saline solutions or diagnostic contrast agents.