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- W2003245775 abstract "Antithrombogenicity in the initial (NCVC-1) centrifugal pump (CP) developed at our institute is provided by a central balancing hole in an impeller that promotes self wash-out blood flow (Sf) around the impeller. The current CP (NCVC-2) was ameliorated to obtain better antithrombogenicity, where the balancing hole diameter was widened to improve Sf velocity (Vsf), and the edge of a thrust bearing (TB) was rounded to minimize flow separation. Effects of the modifications were assessed in in vitro and in vivo studies. The Vsf of the NCVC-1 and the NCVC-2 evaluated by Doppler velocimeter were 12.8 and 22.1 cm/sec, respectively. Flow around the TB visualized by a light cutting method confirmed less flow stagnation in the NCVC-2. In vivo antithrombogenicity of the CPs was investigated in three goats. A pulsatile VAD (P-VAD) was installed paracorporeally between the left atrium and the aorta. After 3 weeks, the P-VAD was exchanged for the NCVC-2 and the NCVC-1 in sequence. Each CP was driven for 1 week and disassembled. No anticoagulation was used, except for heparin injection at pump exchange. Thrombus at the TB was found in the two NCVC-1s, and two little thrombi were on the impeller of another NCVC-1, whereas a thrombus smaller than 1 mm3 at the TB was noted in one NCVC-2. These results indicate that the NCVC-2 has better antithrombogenicity and Sf around the impeller and the TB." @default.
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- W2003245775 date "1995-07-01" @default.
- W2003245775 modified "2023-09-27" @default.
- W2003245775 title "Improvement in Antithrombogenicity in a Centrifugal Pump With Self Wash-Out Structure for Long-Term Use" @default.
- W2003245775 doi "https://doi.org/10.1097/00002480-199507000-00029" @default.
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