In vivo evaluation of the NEDO biventricular assist device with an RPM dynamic impeller suspension system.
Since 1995, the Baylor College of Medicine group has been developing the NEDO Gyro permanent implantable (PI) pump. The Gyro PI pump has achieved outstanding results up to 284 days with no thrombus formation during the left ventricular assist device (LVAD) animal experiments. However, in biventricular assist device (BVAD) animal experiments, thrombus formation did occur. An in vitro experiment showed the reason for thrombus formation was caused by the missed magnetic balance between the impeller and the actuator. On the basis of this result, the revolutions per minute (RPM) impeller suspension system was developed. Six long-term animal studies were performed in bovine models. Survival periods were 90, 80, 60, 51, 48, and 37 days, respectively. No thrombus was observed in the pumps with the exception of one right pump. In that experiment, the thrombus formation may have occurred when the pump had a low flow because of outflow kinking. In this article, the antithrombogenic effect of this RPM impeller suspension system will be discussed.
Ichikawa
Seiji
S
Baylor College of Medicine, Houston, Texas 77030, USA.
Linneweber
Joerg
J
Motomura
Tadashi
T
Ishitoya
Hiroshi
H
Watanabe
Kuniyoshi
K
Ashizawa
Satoshi
S
Murai
Noriyuki
N
Nishimura
Ikuya
I
Sumikura
Hirohito
H
Glueck
Julia A
JA
Shinohara
Toshiyuki
T
Oestmann
Daniel J
DJ
Nosé
Yukihiko
Y
D000818:Animals; D002417:Cattle; D005069:Evaluation Studies as Topic; D005240:Feasibility Studies; D006353:Heart-Assist Devices; D006454:Hemoglobins; D015918:Infusion Pumps, Implantable; D023421:Models, Animal; D013927:Thrombosis / Q000517:prevention & control
D006454:Hemoglobins