FLEX Vessel Prep Prior to Angioplasty in Native Arteriovenous Fistulae (AVF)

NCT ID: NCT05034939

Last Updated: 2025-07-03

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: NA
• Total Enrollment: 75 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2021-09-02
• Study Completion Date: 2022-12-01

Brief Summary

A prospective, multi-center, randomized observational post-market study evaluating the FLEX Vessel Prep device plus percutaneous angioplasty (PTA) vs PTA alone for the treatment of obstructive lesions in the native arteriovenous dialysis fistulae.

Detailed Description

This is a prospective randomized (1:1) post-market observational study evaluating the FLEX Vessel Prep System followed with PTA vs PTA alone for the treatment of de novo or non-stented restenotic obstructive lesions up to 100 mm in length located in the arteriovenous dialysis fistulae in an upper extremity.

The objective is to evaluate and compare the serious adverse event rate at 30 days and primary patency at 6 months when using FLEX Vessel Prep System prior to PTA vs. PTA alone for treatment of obstructive lesion of native arteriovenous fistulae in the upper extremity.

Enrollment will continue until complete data sets are collected for up to 75 subjects from up to 7 sites in the US.

Conditions

Arteriovenous Fistula Stenosis

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: TREATMENT
• Blinding Strategy: NONE

Study Groups

FLEX Vessel Prep System followed with PTA (TEST arm)

FLEX Vessel Prep System is used to create circumferential, continuous micro-incisions along the length of the stenosis by performing a retrograde pullback through the lesion. Following FLEX, standard balloon angioplasty is performed with an uncoated PTA balloon sized to meet the reference vessel diameter, according to its corresponding instructions for use. Once advanced to the lesion, the balloon should be inflated according to the site's standard of care.

Group Type: ACTIVE_COMPARATOR

FLEX Vessel Prep System

Intervention Type: DEVICE

The FLEX Vessel Prep System™ is an over-the-wire sheathed catheter with a three-strut treatment element near the distal tip. As the device is pulled back in a retrograde fashion through the target lesion, the Treatment Element "flexes" providing continuous engagement along the lesion to create controlled depth micro-incisions.

PTA only (CONTROL arm)

Standard Balloon angioplasty is performed with an uncoated PTA balloon sized to meet the reference vessel diameter, according to its corresponding instructions for use. Once advanced to the lesion, the balloon should be inflated according to the site's standard of care.

Group Type: ACTIVE_COMPARATOR

Angioplasty

Intervention Type: DEVICE

The brand and type of PTA balloon(s) used will be at the discretion of the treating physician and used according to its Instructions for Use (IFU). PTA balloons consist of an over-the-wire catheter with a balloon fixed at the distal tip. Within the lesion the balloon is inflated to a pressure that allows full effacement.

Interventions

FLEX Vessel Prep System

The FLEX Vessel Prep System™ is an over-the-wire sheathed catheter with a three-strut treatment element near the distal tip. As the device is pulled back in a retrograde fashion through the target lesion, the Treatment Element "flexes" providing continuous engagement along the lesion to create controlled depth micro-incisions.

Intervention Type: DEVICE

Angioplasty

The brand and type of PTA balloon(s) used will be at the discretion of the treating physician and used according to its Instructions for Use (IFU). PTA balloons consist of an over-the-wire catheter with a balloon fixed at the distal tip. Within the lesion the balloon is inflated to a pressure that allows full effacement.

Intervention Type: DEVICE

Eligibility Criteria

Inclusion Criteria

1. Patient is ≥21 years of age.

2. Patient has a life expectancy of ≥12 months.

3. Patient has a native AV fistula created ≥ 60 days prior to the index procedure.

4. The target AV fistula has undergone successful dialysis for at least 8 of 12 sessions during a four-week period.

5. Patient has a de novo and/or non-stented restenotic lesion located between approximately 2 cm proximal to the arteriovenous anastomosis and axillosubclavian junction with ≥50% stenosis.

6. Patient has a target lesion (which may include a tandem lesion) that is ≤ 100 mm in length (by visual estimate).

Note: Tandem lesions may be enrolled provided they meet all of the following criteria:

• Separated by a gap of ≤ 30mm (3 cm).
• Total combined lesion length, including 30 mm gap, ≤ 100 mm.
• Able to be treated as a single lesion.

7. Patient has a target vessel diameter of 4.0 - 12.0 mm (by visual estimate)

8. Patient underwent successful crossing of the target lesion with the guidewire.

9. Patient provides written informed consent prior to enrollment in the study.

10. Patient is willing to comply with all follow-up evaluations at specified times.

Exclusion Criteria

1. Patient is pregnant or breastfeeding.

2. Patient is receiving immunosuppressive therapy.

3. Patient has undergone prior intervention of access site within 30 days of index procedure.

4. Patient with anticipated conversion to peritoneal dialysis.

5. Patient has an infected AV access or systemic infection.

6. Patient has planned surgical revision of access site.

7. Patient with secondary non-target lesion requiring treatment within 30 days post index procedure.

8. Patient with hemodynamically significant central venous stenoses that cannot be successfully treated prior to treatment of the target lesion.

9. Patient with target AVF or access circuit which previously had thrombectomy within last 30 days.

10. Patients judged to have a lesion that prevents complete inflation of an angioplasty balloon or proper placement of the delivery system.

11. Patient with target lesion located central to the axillosubclavian junction.

12. Patient has significant arterial inflow lesion requiring treatment more than 2 cm upstream from the anastomosis in the AV access.

13. Patient has presence of pseudoaneurysm or aneurysm requiring surgical revision at the target lesion site.

14. Patient with known contraindication, including allergic reaction, or sensitivity to contrast material that cannot be adequately pre-treated.

15. Patient who cannot receive recommended antiplatelet and/or anticoagulant therapy.

16. Patient with clinically significant Steal Syndrome requiring treatment.

17. Patient is enrolled in another investigational drug, device, or biologic study and has not completed the primary endpoint or was previously enrolled in this study.

18. Patient has a co-morbid condition that, in the judgment of the Investigator, may cause him/her to be non-compliant with the protocol or confound the data interpretation.

19. Patient has AV fistula created via endovascular technique.

• Minimum Eligible Age: 21 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

VentureMed Group Inc.

INDUSTRY

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Locations

AKDHC Medical Research Services

Phoenix, Arizona, United States

Open Access Vascular Access

Miami, Florida, United States

Minneapolis Vascular Surgery Center

New Brighton, Minnesota, United States

Metrolina Nephrology Associates

Charlotte, North Carolina, United States

North Carolina Nephrology

Raleigh, North Carolina, United States

Dialysis Access Institute

Orangeburg, South Carolina, United States

Dallas Nephrology Associates

Dallas, Texas, United States

Countries

United States

Provided Documents

Document Type: Study Protocol and Statistical Analysis Plan

View Document

Other Identifiers

VMG-2021-001

Identifier Type: -

Identifier Source: org_study_id