A HIGH EFFICIENCY MAGNETIC BEARING ROTARY BLOOD PUMP

高效磁力轴承旋转式血液泵

• 批准号: 6140526
• 负责人: HSIANG M CHEN
• 金额: $ 9.99万
• 依托单位: FOSTER-MILLER TECHNOLOGIES, INC.
• 依托单位国家: 美国
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-06-01 至 2001-09-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6140526
• 关键词: auxiliary heart prosthesis; biomedical equipment development; circulatory assist; magnetic field; magnetism; microprocessor /microchip; miniature biomedical equipment

Continuous flow, rotary dynamic blood pumps are of significant medical interest. Some successes have been achieved, but the majority of these designs are physically large, electromagnetically complex, and consume significant amounts of power. An innovative prototype blood pump incorporating a single active axis magnetic bearing is proposed. key design features include a passive radial bearing, and a pull-pull axial thrust bearing. A nonlinear axial controller will be designed, to implement a "virtually zero power" system, without incorporating bias magnets. The axial bearing can function in cooperation with ferromagnetic material in the impeller blades, eliminating the need for an impeller shroud. Velocity, rather than displacement, control of the rotor position will be used, to further enhance a virtually zero power bearing operation. Hydraulically, the design incorporates simple, effective impellers, and large, low-shear passages that allow good wash flow. In Phase I, a magnetic bearing system will be designed, built, and tested with a pump fabricated using stereolithography technology. A special, ironless motor will minimize motor-induced magnetic loads. The electronic controller will be breadboarded. This system will be performance tested in blood analog solution, in all orientations. During Phase II, an implantable prototype will be designed, built, and extensively bench and in-vivo tested, preparatory to Phase III qualification. PROPOSED COMMERCIAL APPLICATIONS: Heart disease remains the leading cause of death and disability within the United States. Of the 200,000 Americans who die each year due to heart- related problems, about 30,000 to 60,000 could probably be saved with heart transplants. However, the shortage of donor hearts precludes this, and has stimulated the development of many mechanical heart assist and replacement devices. Should mechanical assist pumps prove sufficiently safe and reliable, the potential use to improve the quality of life for cardiac-impaired patients dramatically expands the market.

连续流动的旋转动态血泵具有重要的医学意义。已经取得了一些成功，但这些设计中的大多数物理上很大，电磁上很复杂，并且消耗大量的功率。提出了一种采用单主动轴磁轴承的创新原型血泵。主要设计特征包括被动径向轴承和推拉式轴向推力轴承。一个非线性轴向控制器将被设计，以实现一个“几乎零功率”的系统，而不包括偏置磁铁。轴向轴承可以与叶轮叶片中的铁磁材料协作起作用，从而消除了对叶轮护罩的需要。速度，而不是位移，转子位置的控制将被使用，以进一步提高一个几乎零功率轴承操作。在液压方面，该设计结合了简单有效的叶轮和大的低剪切通道，从而实现良好的洗涤流动。在第一阶段，磁轴承系统将设计，建造和测试与泵制造使用立体光刻技术。一个特殊的无铁芯电机将最大限度地减少电机感应磁负载。电子控制器将采用试验板。将在血液模拟溶液中对该系统进行所有方向的性能测试。在第二阶段，将设计、制造植入式原型，并进行广泛的台架和体内测试，为第三阶段认证做准备。建议的商业应用：心脏病仍然是美国死亡和残疾的主要原因。每年有20万美国人死于心脏相关的问题，其中大约3万到6万人可能通过心脏移植得救。然而，供体心脏的短缺排除了这一点，并刺激了许多机械心脏辅助和替代装置的发展。如果机械辅助泵被证明足够安全可靠，那么它在改善心脏受损患者生活质量方面的潜在用途将大大扩大市场。