Mitamura Y, Yozu R, Tanaka T, Yamazaki K
Department of Surgery, Keio University School of Medicine, Tokyo, Japan.
ASAIO Trans. 1991 Jul-Sep;37(3):M510-2.
The valvo-pump, an axial, nonpulsatile blood pump implanted at the heart valve position while preserving diseased heart muscle, has several advantages over an artificial heart replacement, including 1) a good anatomic fit to the natural heart, 2) less blood contacting surface, and 3) ease of implantation. The housing for the pump is a tube, 37 mm in diameter (maximum) and 33 mm in length. Within the housing there is an impeller with either 10 vanes (33 mm in diameter) or 5 vanes (22 mm in diameter). The impeller is connected to a samarium-cobalt-rare-earth magnet direct current (DC) brushless motor measuring 23.8 mm in diameter and 30.2 mm in length. Sealing is achieved by means of a magnetic fluid seal. A guiding wheel with 4 vanes is located behind the impeller. The pump was studied on a hydraulic mock circulatory system to evaluate its performance characteristics. A pump flow of 6.9 L/min was obtained at a pump differential pressure of 48 mmHg, and flow of 3.1 L/min was obtained at 58 mmHg. The valvo-pump can be made feasible by developing a small, high-output, power motor and an endurable seal, as well as by optimizing the impeller design.
瓣膜泵是一种轴向、无搏动的血泵，植入心脏瓣膜位置，同时保留患病的心肌，与人工心脏置换相比有几个优点，包括：1）与自然心脏的解剖结构匹配良好；2）血液接触表面较小；3）易于植入。泵的外壳是一根管子，直径最大为37毫米，长度为33毫米。在外壳内有一个叶轮，有10个叶片（直径33毫米）或5个叶片（直径22毫米）。叶轮连接到一个钐钴稀土永磁直流无刷电机，该电机直径为23.8毫米，长度为30.2毫米。通过磁流体密封实现密封。叶轮后面有一个带4个叶片的导向轮。在液压模拟循环系统上对该泵进行了研究，以评估其性能特征。在泵的压差为48 mmHg时，泵流量为6.9 L/min，在58 mmHg时，流量为3.1 L/min。通过开发小型、高输出功率的电机和耐用的密封件，以及优化叶轮设计，瓣膜泵可以成为可行的方案。
