Abstract:
:In this study, a detection algorithm for suction and regurgitation of the centrifugal pump during left heart bypass without relying on external flow or pressure sensors was developed and evaluated in acute studies using adult goats. The detection scheme relies on power spectral density (PSD) analysis of the motor current waveform through which the waveform deformation index (WDI) is obtained. This index is defined as the ratio of the fundamental component of the PSD to the higher PSD components, and its value increases with the deformation of the basic waveform. By assuming that the undistorted motor current waveform can be represented by a pure sine waveform, we theoretically synthesized various waveforms which have different second harmonic components. We were able to synthesize the waveform whose shape was close to the distorted motor current waveform under varying suction levels obtained in a mock loop study. From this study, we came to the conclusion that the WDI value of 0.2 can serve as a threshold level in deciding the suction and regurgitation speeds (rpm) during left heart bypass. In the study using adult goats, we were successful in minimizing both regurgitation and suction when the centrifugal pump speed was adjusted based on the WDI algorithm. The resultant bypass flow ranged from 1.5 to 2.0 L/min which was around 60% of the total flow. Further study is underway to evaluate the applicability of the WDI method in optimizing bypass pump flow.
journal_name
Artif Organsjournal_title
Artificial organsauthors
Yuhki A,Hatoh E,Nogawa M,Miura M,Shimazaki Y,Takatani Sdoi
10.1046/j.1525-1594.1999.06397.xsubject
Has Abstractpub_date
1999-06-01 00:00:00pages
532-7issue
6eissn
0160-564Xissn
1525-1594journal_volume
23pub_type
杂志文章abstract::To develop artificial materials for prolonged use in the vascular system, the complicated process of surface-induced thrombosis needs to be better understood. It is documented that certain antihypertensive drugs can inhibit platelet adhesion to an artificial surface; on the other hand, steroid drugs increase platelet ...
journal_title:Artificial organs
pub_type: 杂志文章
doi:
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abstract::Effect of hemodialysis (HD) on some indices of immune response was studied in nine chronic uremics. Total lymphocyte, OKT4+, and OKT8+ cell numbers significantly decreased during the first 20 min of HD, and they were decreased till the third hour of the procedure, whereas the OKT4+/OKT8+ cell number ratio did not chan...
journal_title:Artificial organs
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pub_type: 杂志文章
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journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1111/j.1525-1594.1995.tb02389.x
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pub_type: 杂志文章
doi:10.1111/j.1525-1594.2008.00700.x
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journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1046/j.1525-1594.1999.06228.x
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journal_title:Artificial organs
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doi:10.1111/aor.12507
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journal_title:Artificial organs
pub_type: 杂志文章
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pub_type: 杂志文章
doi:10.1046/j.1525-1594.2003.07273.x
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journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1111/j.1525-1594.1992.tb00331.x
更新日期:1992-10-01 00:00:00
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pub_type: 杂志文章
doi:10.1111/j.1525-1594.2005.29088.x
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journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1111/j.1525-1594.1995.tb02334.x
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journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1046/j.1525-1594.1998.05087.x
更新日期:1998-04-01 00:00:00
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pub_type: 临床试验,杂志文章
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doi:10.1046/j.1525-1594.2003.07015.x
更新日期:2003-03-01 00:00:00
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journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1046/j.1525-1594.2002.06999.x
更新日期:2002-05-01 00:00:00
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pub_type: 杂志文章
doi:10.1046/j.1525-1594.2003.07193.x
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journal_title:Artificial organs
pub_type: 杂志文章
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更新日期:1995-07-01 00:00:00
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journal_title:Artificial organs
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journal_title:Artificial organs
pub_type: 杂志文章
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pub_type: 杂志文章
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journal_title:Artificial organs
pub_type: 历史文章,杂志文章,评审
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更新日期:2015-09-01 00:00:00
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journal_title:Artificial organs
pub_type: 杂志文章
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更新日期:1978-05-01 00:00:00
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pub_type: 杂志文章
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journal_title:Artificial organs
pub_type: 杂志文章,评审
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journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1111/j.1525-1594.2004.07284.x
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journal_title:Artificial organs
pub_type: 杂志文章
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