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Abstract
Grant Number: 1R44HL077029-01 Project Title: Small Non-Thrombogenic Rotary Mag Lev LVAD
PI Information: Name Title JAHANMIR, SAID sjahanmir@mitiheart.com VICE PRESIDENT Abstract: DESCRIPTION (provided by applicant): The overall objective of the proposed SBIR effort is to design, manufacture, and evaluate a small non-thrombogenic rotary LVAD employing a novel biocompatible and non-wetting coating, MiTi's hybrid active.passive magnetic levitation system and a redundant hydrodynamic thrust bearing. All blood-contacting surfaces will be manufactured from Ti-6AI-4V alloy coated with an innovative fully hydrogenated diamond like carbon (DLC) coating. A top layer of heparinized organic film will be applied to the rotating DLC coated titanium alloy surfaces. The combination of hydrophobic DLC and hydrophilic organic coating provides an innovative means to reduce the shear stresses on bearing surfaces, thus reducing the potential for hemolysis and thrombosis. The Specific Aims of the Phase I feasibility study are to (1) develop an interfacial film (TiC and/or TiN) on titanium alloy test coupons to enhance adhesion of DLC coating and evaluate coating adhesion using conventional indentation testing, (2) confirm hemocompatibility of DLC coated titanium alloy test coupons through assessment of platelet morphology and fibrin formation, and (3) complete the preliminary redesign the MiTiHeart LVAD for 40% volume reduction and incorporate the concept of hydrophobic bearing surfaces while maintaining the pump output. Upon successful completion of Phase I objectives, a new blood pump will be manufactured in phase II. The performance of the new pump will be evaluated in vitro and in vivo using a bovine calf model. The animal testing will be conducted at the Pennsylvania State University, Hershey Medical Center. Key technical innovations of the proposed integrated hybrid magnetic bearing centrifugal blood pump design that is mechanically simpler and smaller than existing pulsatile configurations include (1) a novel hydrophobic, hydrogenated DLC coating and a hydrophillic heparinized film, (2) permanent magnet radial bearings; (3) a hydrodynamic thrust bearing system for impact shock loads and emergency backup; (4) a single actively controlled magnetic thrust bearing; (5) a radial out-flow impeller; and 6) an efficient bushless dc micro-motor. The MiTiHeart LVAD will be designed for use as destination therapy for adult heart failure patients of small to medium frame that are not being served by present pulsatile devices. The final LVAD design information will be licensed to MiTiHeart Corporation, a subsidiary of MiTi, for further animal testing and initiation of the FDA approval process.
Public Health Relevance:
This Public Health Relevance is not available.Thesaurus Terms:
antithrombogenic surface, auxiliary heart prosthesis, biomaterial compatibility, biomaterial development /preparation, biomedical equipment development, circulatory assist, surface coating, technology /technique development
blood volume, chemical property, fibrin, intracardiac volume, platelet activation, shear stress
bioengineering /biomedical engineering, medical implant science
Institution: MOHAWK INNOVATIVE TECHNOLOGY, INC. 1037 WATERVLIET-SHAKER RD ALBANY, NY 122052033 Fiscal Year: 2004 Department: Project Start: 01-MAY-2004 Project End: 30-APR-2007 ICD: NATIONAL HEART, LUNG, AND BLOOD INSTITUTE IRG: ZRG1