Randomized multicenter clinical trial consisting of two arms; one arm treated with PTA plus the MicroStent® System and one arm treated with PTA alone. Purpose to evaluate the safety and effectiveness of using the MicroStent® Peripheral Vascular Stent System, hereafter referred to as the MicroStent® System, for the treatment of infrapopliteal lesions in subjects with peripheral arterial disease.



Eligible Ages
Over 21 Years
Eligible Genders
Accepts Healthy Volunteers

Inclusion Criteria

  1. Subject is a male or a non-pregnant female adult between the age of 21 and 90 years old. 2. Subject has documented clinical evidence of critical limb ischemia (CLI) in the target limb prior to the index procedure, with a Rutherford Classification score of 4-5. 3. The subject, or subject's designated legal representative, has been informed of the nature of the study and is willing to provide written informed consent. 4. Subject is willing to comply with all required follow-up visits. 5. Subject life expectancy is ≥1 year per the Principal Investigator. Angiographic Inclusion Criteria 6. Target vessel reconstitutes at or above the ankle with inline flow to at least one patent (<50% stenosis) inframalleolar outflow vessel. 7. Subject has a lesion, with ≥ 70% stenosis and ≤ 12.0 cm in length located at or distal to the tibial-peroneal trunk and above the tibiotalar joint; including the anterior tibial, posterior tibial or peroneal arteries. 8. Target lesion has a reference vessel diameter of 2.5 - 4.5 mm 9. The target lesion is able to be crossed with a guidewire to facilitate treatment with the randomized device. General

Exclusion Criteria

  1. Subject had a prior or has a planned index limb amputation above the ankle. 2. Subject has a wound/ulcer on the forefoot with a surface area >4cm² or osteomyelitis involving the calcaneus bone. 3. Subject is pregnant, plans to become pregnant, or is nursing. 4. Subject has clinical conditions that severely inhibit X-ray or duplex ultrasound visualization (e.g. body habitus). 5. Subject has a history of hypercoagulation/clotting disorders or acute thrombosis. 6. Subject has allergy to iodinated contrast media that cannot be adequately managed with medication. 7. Subject is in acute renal failure. 8. Subject has an active systemic infection. 9. Subject is participating in another research study involving an investigational device, biologic, or drug that has not completed the primary endpoint at the time of randomization/enrollment. 10. Subject has other comorbidities that - in the opinion of the investigator - preclude them from receiving study treatment and/or from completing the required study follow-up assessments. 11. Subject presents with acute limb ischemia or acute thrombosis of the target limb. 12. Subject has experienced myocardial infarction, thrombolysis, or angina less than 30 days prior to the index procedure. 13. Subject had a stroke within 3 months of index procedure. Angiographic exclusion criteria 14. Failure to successfully treat clinically significant inflow lesions in the ipsilateral iliac, femoral, or popliteal arteries. Successful treatment is defined as obtaining ≤30% residual stenosis with no major procedural complications (e.g embolism). 15. Failure to successfully treat significant non-target infra-popliteal lesions. Successful treatment is defined as obtaining ≤30% residual stenosis with no major procedural complications (e.g. embolism). 16. Target lesion is within a previously placed stent.

Study Design

Study Type
Intervention Model
Parallel Assignment
Primary Purpose
None (Open Label)

Arm Groups

ArmDescriptionAssigned Intervention
MicroStent and Standard PTA
Implant of the MicroStent peripheral vascular stent system for treatment of arterial lesions below the knee.
  • Device: MicroStent and Standard PTA
    Self-expanding stent and standard PTA balloon
Active Comparator
Standard PTA
  • Device: MicroStent and Standard PTA
    Self-expanding stent and standard PTA balloon
  • Device: Standard PTA
    Standard PTA balloon

Recruiting Locations

University of Maryland - Baltimore
Baltimore, Maryland 21201
Shannon Hawkins

More Details

Micro Medical Solution, Inc.

Study Contact

Kate Mandall


Study information shown on this site is derived from ClinicalTrials.gov (a public registry operated by the National Institutes of Health). The listing of studies provided is not certain to be all studies for which you might be eligible. Furthermore, study eligibility requirements can be difficult to understand and may change over time, so it is wise to speak with your medical care provider and individual research study teams when making decisions related to participation.