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Peripheral Arterial DiseaseTORUS2NCT04130737

The PQ Bypass Pivotal IDE Intra-arterial Stent Graft Study

A study testing TORUS Stent Graft System in people with Peripheral Arterial Disease, run by Endologix at 32 sites in United States.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
Search all trials

Trial summary

The primary objective of the TORUS 2 IDE Clinical Study is to evaluate the safety and effectiveness of the TORUS Stent Graft System in the treatment of obstructive atherosclerotic lesions of the native SFA or the superficial femoral and/or proximal popliteal arteries. Read more about this study

Who is it for?
Ages 18 to 90 years
Conditions the study is for
Peripheral Arterial Disease
What is being tested?
TORUS Stent Graft System
Type of treatment
Medical device
Could I receive a placebo?
No, everyone receives an active treatment
How many people
188 participants
Where
32 sitesUnited States
Study dates
13 Aug 2018to 14 Feb 2025
Phase
Interventional
Are there results?
Yes, posted in the registrySummary in the doctors' view

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 90 years
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Patient is male or female, with age > 18 and ≤ 90 years at date of enrollment.
  • Patient provides written informed consent before any study-specific investigations or procedures.
  • Patient is willing to undergo all follow-up assessments according to the specified schedule over 36 months.
  • Patient is a suitable candidate for angiography and endovascular intervention and, if required, is eligible for standard surgical repair.
  • Patient has symptomatic peripheral arterial disease (PAD) of the lower extremities requiring intervention to relieve de novo obstruction or occlusion or restenosis of the native femoropopliteal artery.
  • Patient has PAD classified as Rutherford classification 2, 3 or 4.
Show all 14Show fewer
  • Patient has documented PAD by either (i) a resting ankle-brachial index (ABI) of ≤ 0.90 (or ≤ 0.75 after exercise of the target limb). Resting toe brachial index (TBI) is performed only if unable to reliably assess ABI. TBI must be <0.70; or (ii) Normal ABI with angiographic, ultrasound, MRA, or CT evidence of ≥ 60% diameter stenosis.
  • Patient has single or multiple stenotic, restenotic or occlusive lesions within the native femoropopliteal artery ("target lesions") that can be crossed with a guidewire and fully dilated.
  • Single target lesion must be covered by a single stent. Tandem target lesions are considered a single continuous lesion if the gap between lesions is ≤ 5 cm and > 30% diameter stenosis between the lesion(s).
  • Target lesion(s) eligible for treatment under the protocol are at least least 3 cm above the bottom of the femur.
  • Target lesion(s) reference vessel diameter is between 5.0 mm and 6.7 mm by operator's visual estimate.
  • Target lesion measures ≥ 80 mm to ≤ 180 mm in overall length, with ≥ 60% diameter stenosis by operator's visual estimate. Tandem target lesions are considered a single continuous lesion if the gap between lesions is ≤ 5 cm and > 30% diameter stenosis between the lesion(s).
  • Patient has a patent popliteal artery (no stenosis ≥ 50%) distal to the treated segment.
  • Patient has at least one patent infrapopliteal vessel (< 50% stenosis) with run-off to the ankle.

Who cannot join

  • Patient is unable or is unwilling to comply with the procedural requirements of the study protocol or will have difficulty in complying with the requirements for attending follow-up visits.
  • Patient has a comorbidity that in the investigator's opinion would limit life expectancy to less than 24 months.
  • Patient has any planned major surgical procedure (including any amputation of the target limb) within 30 days after the index procedure for this study.
  • Patient has a target vessel that has been treated with any type of surgical procedure prior to enrollment.
  • Patient has a target vessel that has been treated with bypass surgery.
  • Patient has PAD classified as Rutherford classification 0, 1, 5 or 6.
Show all 23Show fewer
  • Patient has known or suspected active systemic infection at the time of enrollment.
  • Patient has a known coagulopathy or has bleeding diatheses, thrombocytopenia with platelet count less than 100,000/microliter or INR (international normalized ratio) >1.8.
  • Patient has a stroke diagnosis within three months prior to enrollment.
  • Patient has a history of unstable angina or myocardial infarction within 60 days prior to enrollment.
  • Patient has a contraindication to antiplatelet, anticoagulant or thrombolytic therapies.
  • Patient has known allergy to contrast agents or medications used to perform endovascular intervention that cannot be adequately pre-medicated.
  • Patient has known allergy to titanium, nickel or tantalum (does not include mild contact dermatitis due to nickel allergy).
  • Patient has received thrombolysis within 72 hours prior to the index procedure.
  • Patient has acute or chronic renal disease (e.g., as measured by a serum creatinine of > 2.5 mg/dL or > 220 μmol/L or GFR < 30 ml/min), or on peritoneal or hemodialysis.
  • Patient requiring coronary intervention within seven days prior to enrollment.
  • Patient is pregnant or breast-feeding.
  • Patient is participating in another research study involving an investigational product (pharmaceutical, biologic or medical device).
  • Patient has other medical, social or psychological problems that, in the opinion of the investigator, preclude them from receiving this treatment, and the procedures and evaluations pre- and post-treatment.
  • Patient has significant disease or obstruction (≥ 50%) of the inflow tract that has not been successfully treated at the time of the index procedure (success measured as ≤ 30% residual stenosis, without complication).
  • Patient has no patent (≥ 50% stenosis) outflow vessel providing run-off to the ankle.
  • There is a lack of full expansion in the predilatation balloon.
  • Evidence of aneurysm or acute thrombus in target vessel.

Trial locations and contacts

32 sites in 1 country.

32 sites in 1 country

United States32 sites
  • Rocky Mountain Regional VAMC

    Aurora, Colorado, 80045

  • McLaren Bay Region

    Bay City, Michigan, 48708

  • Bay Area Vein & Vascular Institute

    Burlingame, California, 94010

  • Novant Health

    Charlotte, North Carolina, 28204

  • The Lindner Center for Research & Education

    Cincinnati, Ohio, 45219

  • The Vascular Experts

    Darien, Connecticut, 06820

  • AMITA Health

    Elk Grove, Illinois, 60007

  • Michigan Vascular Center

    Flint, Michigan, 48507

  • Stern Cardiovascular Foundation

    Germantown, Tennessee, 38138

  • Bellin Hospital

    Green Bay, Wisconsin, 54301

  • Prisma Health

    Greenville, South Carolina, 29615

  • MedStar Health Research Insitute

    Hyattsville, Maryland, 20782

  • First Coast Cardiovascular Institute

    Jacksonville, Florida, 32256

  • Arkansas Heart

    Little Rock, Arkansas, 72211

  • Texas Tech

    Lubbock, Texas, 79430

  • North Dallas Research Associates

    McKinney, Texas, 75069

  • Southwest CVA

    Mesa, Arizona, 85206

  • Vascular Heart & Lung Associates

    Mesa, Arizona, 85206

  • Palm Vascular Centers

    Miami Beach, Florida, 33140

  • Columbia University Medical Center

    New York, New York, 10032

  • Sentara Vascular Specialists

    Norfolk, Virginia, 23507

  • Naadi

    Oklahoma City, Oklahoma, 73116

  • Coastal Vascular & Interventional

    Pensacola, Florida, 32504

  • Phoenix Cardiovascular Research Group

    Phoenix, Arizona, 85018

  • The Miriam Hospital

    Providence, Rhode Island, 02906

  • NC Heart & Vascular Research

    Raleigh, North Carolina, 27607

  • Eastlake Cardiovascular

    Roseville, Michigan, 48066

  • UCSF

    San Francisco, California, 94143

  • North Central Heart

    Sioux Falls, South Dakota, 57108

  • Northern Mississippi Medical Center

    Tupelo, Mississippi, 38801

  • Florida Cardiology

    Winter Park, Florida, 32792

  • Yuma Cardiology Associates

    Yuma, Arizona, 85349

Other trials in United States

About this study

Official title: The PQ Bypass Pivotal IDE Intra-arterial Stent Graft Study for Occlusive and Re-stenotic Fem-pop Revascularization - 2 Trial: TORUS 2

The primary objective of the TORUS 2 IDE Clinical Study is to evaluate the safety and effectiveness of the TORUS Stent Graft System in the treatment of obstructive atherosclerotic lesions of the native SFA or the superficial femoral and/or proximal popliteal arteries.

Read the detailed description

Peripheral Arterial Disease, specifically in the superficial femoral arteries (SFA) and proximal popliteal arteries, are treated by a range of alternative practices and procedures for the patient population identified in the indications for use statement. Non-invasive approaches include exercise and drug therapy.

Minimally-invasive approaches include endovascular intervention using percutaneous transluminal angioplasty using a plain or drug-coated balloon, stents (bare metal, drug-eluting and covered) and various modalities of atherectomy.

SFA Stent Graft Systems have a clinical history that demonstrates that this device type is well understood, and the benefits and risks are well-characterized, i.e. mature technology.

Endologix believes that the clinical performance of the TORUS stent would be comparable to marketed SFA Stent Graft System. The TORUS 2 IDE Clinical Study will confirm this and is designed to demonstrate the safety and effectiveness of the TORUS Stent Graft System in patients with SFA and/or proximal popliteal artery disease

Being tested
TORUS Stent Graft System
Keywords
Peripheral Artery Disease, Superficial Femoral Artery, Popliteal Artery, Stent Graft
Medical subject headings
Peripheral Arterial Disease

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • TORUS Stent Graft SystemDevice

    Also called TORUS Stent Graft, PQ Bypass™ Stent Graft System

    The TORUS Stent Graft is an intravascular prosthesis intended to improve blood flow in the area in which it is implanted and the TORUS Stent Graft Delivery System is a standard pin-and-pull delivery system used to implant the SG in the desired area. Use of the TORUS Stent Graft allows for improving blood flow in the peripheral vasculature.

Study groups in NCT04130737
Study groupRoleWhat they receive
TORUS Stent Graft SystemExperimentalThe TORUS Stent Graft System (SGS) is comprised of a Stent Graft (SG) and a Stent Graft Delivery System (SGDS).
Receives: Device: TORUS Stent Graft System

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Freedom From a Major Adverse Event (MAE)

    An MAE is defined as all-cause death, target limb major amputation and clinically-driven target lesion revascularization (CD-TLR)

    Measured: 30 days

  2. Primary Patency

    Primary patency is defined as the absence of clinically-driven target lesion revascularization (CD-TLR) and absence of recurrent target lesion diameter stenosis >50% by duplex ultrasound with a peak systolic velocity ratio of >2.5.

    Measured: 12 months

Secondary outcomes (12)
  1. Technical Success

    Technical success is defined as the ability to cross and dilate the lesion to achieve residual stenosis of ≤30%

    Measured: At the time of the index procedure

  2. Procedural Success

    Procedural Success is defined as technical success with out any MAEs.

    Measured: Within 24 hours of the procedure

  3. Major Adverse Event (MAE) Rate

    Composite rate of all-cause death, target limb major amputation and clinically-driven target lesion revascularization (CD-TLR).

    Measured: 12 months

  4. Major Amputation on Target Limb

    Major Amputation on Target Limb were adjudicated by the Clinical Event Committee (CEC), and rates were tabulated through 30 days, 6 months, 12 months, 24 months, and 36 months

    Measured: Through 36 months

  5. Patency Rate

    Absence of CD-TLR and absence of recurrent target lesion diameter stenosis >50% by duplex ultrasound with a peak systolic velocity ratio of >2.5.

    Measured: Through 12 months

  6. Clinically Driven Target Lesion Revascularization

    Clinically Driven Target Lesion Revascularization were adjudicated by the Clinical Event Committee (CEC), and rates were tabulated through 30 days, 6 months, 12 months, 24 months, and 36 months

    Measured: Through 36 months

  7. Walking Improvement Questionnaire (WIQ) Assessment

    Walking Impairment Questionnaire (WIQ) - The WIQ is a patient-reported outcome measure that assesses self-reported walking ability in individuals with peripheral arterial disease (PAD). It evaluates perceived difficulty performing walking tasks related to walking distance, walking speed, and stair climbing, which reflect functional limitations caused by PAD.

    Scale Structure and Scoring:

    The WIQ consists of three subscales:

    Walking Distance Walking Speed Stair Climbing

    Each subscale is scored from 0 to 100, where higher scores indicate better walking function.

    The Composite PAD Score (PADSCORE) is calculated by averaging the three subscale scores, resulting in a total composite score ranging from 0 to 100.

    Scale Ranges and Interpretation:

    WIQ Subscale Scores: 0 (worst function) to 100 (best function) WIQ Composite PAD Score: 0 (worst walking impairment) to 100 (no walking impairment)

    Direction of Outcome:

    For all WIQ scores, higher values represent a better outcome

    Measured: Change from baseline to 12-Month follow-up (Collected at 1M,6M, and 12M)

  8. Quality of Life Assessment by the EQ5D VAS

    EuroQol Visual Analog Scale (EQ-5D-VAS) - The EQ-5D-VAS is a patient-reported outcome measure that assesses overall self-rated health-related quality of life. Participants rate their current health status using a visual analog scale anchored by the best and worst imaginable health states.

    Scale Structure and Scoring:

    Participants mark their perceived health status on a vertical visual analog scale.

    Scale Range and Interpretation:

    EQ-5D-VAS Score Range: 0 to 100

    0: Worst imaginable health state (minimum) 100: Best imaginable health state (maximum)

    Direction of Outcome:

    Higher EQ-5D-VAS scores represent a better outcome, reflecting better perceived health-related quality of life. Lower scores indicate worse perceived health status.

    Unit of Measure:

    EQ-5D-VAS (scores on a scale)

    Measured: Change from baseline to 12-Month follow-up (Collected at 1M, 6M, and 12M)

  9. Stent Fracture Rate

    Stent fracture rate using VIVA definitions

    Measured: 12 months

  10. Change in Ankle-Brachial Index

    Change in Ankle-Brachial Index (ABI) in study subjects from baseline to each study interval through follow-up.

    Scale Structure and Scoring:

    Change in ABI was calculated as the difference between post-baseline ABI and baseline ABI for each participant for the target limb.

    ABI is a unitless ratio and does not have a fixed theoretical minimum or maximum value. Therefore, interpretation is based on clinically established thresholds rather than absolute scale limits:

    ABI ≤ 0.90: Consistent with peripheral arterial disease ABI 0.91-1.29: Generally considered normal arterial perfusion ABI ≥ 1.30: Suggestive of non-compressible arteries (e.g., arterial calcification)

    Change in ABI:

    Positive change (increase): Improvement in lower-extremity perfusion Negative change (decrease): Worsening arterial perfusion

    Direction of Outcome:

    For Change in ABI, higher (more positive) values represent a better outcome

    Measured: Change from Baseline through 36 months

  11. Change in Toe Pressures

    Change in Toe-Brachial Index (TBI) in study subjects from baseline to each study interval through follow-up for the target limb. If ABI could not be assessed the TBI was assessed.

    Scale Structure and Scoring:

    TBI is calculated as:

    TBI = Toe systolic blood pressure ÷ Brachial systolic blood pressure

    Change in TBI was calculated as the difference between post-baseline TBI and baseline TBI for each participant.

    Scale Range and Clinical Interpretation:

    TBI is a unitless ratio and does not have a fixed theoretical minimum or maximum value. Interpretation is therefore based on clinically established thresholds rather than absolute scale limits:

    TBI < 0.70: Consistent with peripheral arterial disease TBI ≥ 0.70: Generally considered normal digital perfusion

    For Change in TBI:

    A positive change (increase) indicates improvement in distal (digital) perfusion A negative change (decrease) indicates worsening arterial perfusion

    Measured: Change from Baseline through 36 months

  12. Change in Rutherford Clinical Classification

    Clinical success: improvement in ≥ 1 Rutherford class

    Measured: From procedure through 36 months

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted17 Oct 2019
  2. Study start13 Aug 2018
  3. Primary completion6 Jan 2023
  4. Study completion14 Feb 2025

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase N/A
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrolment
188 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT04130737
Sponsor's protocol ID
CLN 227
Acronym
TORUS2
Status last verified
Apr 2026
First submitted
10 Oct 2019
Last updated
10 Jul 2026
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
Yes
Individual data sharing
No

Questions about this trial

What is this clinical trial studying?

A study testing TORUS Stent Graft System in people with Peripheral Arterial Disease, run by Endologix at 32 sites in United States.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 14 inclusion and 23 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 10 Jul 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 32 sites in United States. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

Yes. Results are posted in the registry (first posted 10 Jul 2026). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Freedom From a Major Adverse Event (MAE) (time frame: 30 days). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 10 Jul 2026.

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