Development of a TAVI Device with a Reduced Crossing Profile

Information

  • Research Project
  • 8521873
  • ApplicationId
    8521873
  • Core Project Number
    R43HL118786
  • Full Project Number
    1R43HL118786-01
  • Serial Number
    118786
  • FOA Number
    PA-12-088
  • Sub Project Id
  • Project Start Date
    8/28/2013 - 11 years ago
  • Project End Date
    8/27/2014 - 10 years ago
  • Program Officer Name
    LEE, ALBERT
  • Budget Start Date
    8/28/2013 - 11 years ago
  • Budget End Date
    8/27/2014 - 10 years ago
  • Fiscal Year
    2013
  • Support Year
    01
  • Suffix
  • Award Notice Date
    8/28/2013 - 11 years ago

Development of a TAVI Device with a Reduced Crossing Profile

DESCRIPTION (provided by applicant): Transcatheter aortic valve implantation (TAVI) is a minimally invasive approach to valve replacement that has had a rapid and profound clinical impact. Less than ten years after the first human use of a TAVI device, nearly 20,000 patients annually receive these novel devices. Today, this clinical population is limited to older, sicker patients who cannot tolerate an open surgical procedure. While commercially available TAVI devices demonstrate excellent survival rates, the large size of these 'first generation' devices drives a high rate (20- 30%) of serious complications. Accordingly, the primary design objective for improved second generation devices is a reduction in device diameter. The majority of the crossing profile (diameter) comes from the cusps themselves, which are comprised of relatively thick pericardium derived from animal sources. Thus a reduction in cusp thickness would have a dramatic impact on patient outcomes (decreased stroke and access complications). Moreover, as complication rates are decreased, it is clear that TAVI use will broaden beyond the inoperable patient population to include younger, healthier patients who would benefit from a less invasive procedure. Expanded use of TAVI devices will also have a positive economic impact on the healthcare system, with decreased O.R. times, shorter hospital stays, and reduced complication rates. We have developed a technology called 'Tissue Engineering by Self-Assembly' (TESA), where robust, tissue constructs can be built from cell-synthesized sheets and/or threads, without any biomaterials or chemical fixation that can trigger degradation, calcification, or inflammation. The mechanical properties of TESA valve cusps can also be changed regionally, using folding, layering, or embedding strategies. The overarching goal of this SBIR Phase I proposal is to demonstrate the feasibility of using the TESA platform to build a functional TAVI valve with a delivery profile ~25% smaller than current commercial devices. In Specific Aim #1, we will quantify the mechanical properties (ultimate tensile strength, Young's modulus, bending stiffness and suture holding strength) of several different TESA configurations. This will include characterizing the properties of sheets of various thicknesses and sheets that are reinforced by different folding or embedding strategies. In total, we will test 17 different configurations including pericardium and native valve controls. We will then draw from this 'library' of mechanical properties to guide tissue design in both the suture zone (prioritizing suture holding strength) and the coaptation zone where the individual cusps come together (prioritizing strength then flexibility). In Specific Aim #2, we will build and test these novel TAVI devices for basic functionality and resistance to dynamic fatigue. If success criteria are not met (deploy without perforation, withstand 1k cycles in a hemodynamic tester and 5M cycles in an accelerated wear tester), we will revise the valve cusp design based on the observed failure mode and the data 'library' produced in Aim #1. If these functional milestones are met, animal testing will be pursued in a Phase II application.

IC Name
NATIONAL HEART, LUNG, AND BLOOD INSTITUTE
  • Activity
    R43
  • Administering IC
    HL
  • Application Type
    1
  • Direct Cost Amount
  • Indirect Cost Amount
  • Total Cost
    207689
  • Sub Project Total Cost
  • ARRA Funded
    False
  • CFDA Code
    837
  • Ed Inst. Type
  • Funding ICs
    NHLBI:207689\
  • Funding Mechanism
    SBIR-STTR RPGs
  • Study Section
    ZRG1
  • Study Section Name
    Special Emphasis Panel
  • Organization Name
    CYTOGRAFT TISSUE ENGINEERING, INC.
  • Organization Department
  • Organization DUNS
    020377813
  • Organization City
    NOVATO
  • Organization State
    CA
  • Organization Country
    UNITED STATES
  • Organization Zip Code
    949498248
  • Organization District
    UNITED STATES