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Titolo:
A durable, non power consumptive, simple seal for rotary blood pumps
Autore:
Mitamura, Y; Sekine, K; Asakawa, M; Yozu, R; Kawada, S; Okamoto, E;
Indirizzi:
Hokkaido Univ, Grad Sch Engn, Div Syst & Informat Engn, Kita Ku, Sapporo, Hokkaido 0608628, Japan Hokkaido Univ Sapporo Hokkaido Japan 0608628 oro, Hokkaido 0608628, Japan Keio Univ, Sch Med, Tokyo, Japan Keio Univ Tokyo JapanKeio Univ, Sch Med, Tokyo, Japan Hokkaido Tokai Univ, Sch Engn, Sapporo, Hokkaido, Japan Hokkaido Tokai Univ Sapporo Hokkaido Japan ngn, Sapporo, Hokkaido, Japan
Titolo Testata:
ASAIO JOURNAL
fascicolo: 4, volume: 47, anno: 2001,
pagine: 392 - 396
SICI:
1058-2916(200107/08)47:4<392:ADNPCS>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
VENTRICULAR ASSIST SYSTEM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
12
Recensione:
Indirizzi per estratti:
Indirizzo: Mitamura, Y Hokkaido Univ, Grad Sch Engn, Div Syst & Informat Engn, Kita Ku, Kita 13 Nishi 8, Sapporo, Hokkaido 0608628, Japan Hokkaido Univ Kita 13 Nishi 8 Sapporo Hokkaido Japan 0608628 n
Citazione:
Y. Mitamura et al., "A durable, non power consumptive, simple seal for rotary blood pumps", ASAIO J, 47(4), 2001, pp. 392-396

Abstract

One of the key technologic requirements for rotary blood pumps is the sealing of the motor shaft. A mechanical seal, a journal bearing, magnetic coupling, and magnetic suspension have been developed, but they have drawbacks such as wear, thrombus formation, and power consumption. A magnetic fluid seal was developed for an axial flow pump. A magnetic fluid seal is durable,simple, and non power consumptive. Long-term experiments and finite element modeling (FEM) analyses confirmed these advantages. The seal body was composed of a Ned-Fe magnet and two pole pieces; the seal was formed by injecting ferrofluid into the gap (50 mum) between the pole pieces and the motor shaft. To contain the ferrofluid in the seal and to minimize the possibility of ferrofluid making contact with blood, a shield with a small cavity wasattached to the pole piece. While submerged in blood, the sealing pressureof the seal was measured and found to be 188 mm Hg with ferrofluid LS-40 (saturated magnetization, 24.3 kA/m) at a motor speed of 10,000 rpm and 225 mm Hg under static conditions. The magnetic fluid seals performed perfectlyat a pressure of 100 mm Hg for 594 + days in a static condition, and 51, 39+, and 34+ days at a motor speed of 8,000 rpm. FEM analyses indicated a theoretical sealing pressure of 260 mm Hg. The state of the magnetic fluid inthe seal in water was observed with a microscope. Neither splashing of magnetic fluid nor mixing of the magnetic fluid and water was observed. The specially designed magnetic fluid seal for keeping liquids out is useful for axial flow blood pumps. The magnetic fluid seal was incorporated into an intracardiac axial flow pump.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/01/20 alle ore 04:44:49