The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
Copyrights notice
The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
Yang baru vitro alat eksperimen telah dibangunkan untuk mengkaji mekanisme genesis injap jantung mekanikal bunyi klik penutup ultrasonik. Memandangkan penguji yang baru dibangunkan menggunakan aliran udara termampat secara langsung dan bukannya cecair analog darah untuk memacu injap jantung mekanikal, ia tidak mungkin menghasilkan sebarang peronggaan. Klik penutup diukur dengan pecutan kecil pada permukaan pemegang injap yang diperbuat daripada getah silikon. Klik penutup ultrasonik serta klik penutup yang boleh didengar, sama seperti yang diukur secara klinikal, boleh diperhatikan menggunakan persediaan ini. Oleh itu, telah disahkan bahawa klik penutup ultrasonik boleh dijana tanpa kewujudan peronggaan. Pengukuran serentak gerakan injap dibuat dengan kamera video berkelajuan tinggi, dan analisis bingkai video dan klik menunjukkan bahawa komponen isyarat frekuensi lebih tinggi lebih daripada 50 kHz boleh dijana hanya pada saat penutupan, yang bermaksud perlanggaran okluder dengan perumahan. Lapan belas pecutan miniatur dengan keluasan satu milimeter persegi telah dibangunkan dan tersangkut pada perumahan untuk memantau pengedaran getaran perumahan secara terperinci, dan didapati bahawa getaran sepadan dengan klik penutup ultrasonik yang disebarkan dari hentian injap: titik perlanggaran daripada occluder dengan perumahan. Fakta ini menunjukkan bahawa penjanaan klik penutup ultrasonik adalah terhad kepada kawasan kecil perlanggaran. Daripada keputusan tersebut, disimpulkan bahawa asal utama genesis klik penutup ultrasonik adalah perlanggaran occluder dengan perumahan.
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Salinan
Jun HASEGAWA, Kenji KOBAYASHI, "Genesis of the Mechanical Heart Valves' Ultrasonic Closing Clicks" in IEICE TRANSACTIONS on Information,
vol. E92-D, no. 4, pp. 717-722, April 2009, doi: 10.1587/transinf.E92.D.717.
Abstract: A new in vitro experimental tool was developed to study the mechanism of the ultrasonic closing clicks' genesis of mechanical heart valves. Since the newly developed tester adopted compressed air flow directly instead of the blood analog fluid to drive the mechanical heart valve, it is not possibe to generate any cavitation. Closing clicks were measured with a small accelerometer at the surface of the valve holder made of silicone rubber. Ultrasonic closing clicks as well as audible closing clicks, similar to those measured clinically, could be observed using this setup. Thus, it was confirmed that the ultrasonic closing clicks can be generated without the existence of cavitation. Simultaneous measurements of the valve motion were made with a high-speed video camera, and the analysis of the video frames and clicks showed that higher frequency signal components of more than 50 kHz could be generated only at the instant of the closure, which means the collision of the occluder with the housing. Eighteen miniature accelerometers with an area of one square millimeter were developed and stuck on the housing to monitor the distribution of the housing vibrations in detail, and it was found that the vibrations correspond to the ultrasonic closing clicks propagated from the valve stop: the collision point of the occluder with the housing. This fact indicated that the generation of ultrasonic closing clicks are limited to the small area of the collision. From those results, it was concluded that the major origin of the ultrasonic closing clicks' genesis should be the collision of the occluder with the housing.
URL: https://global.ieice.org/en_transactions/information/10.1587/transinf.E92.D.717/_p
Salinan
@ARTICLE{e92-d_4_717,
author={Jun HASEGAWA, Kenji KOBAYASHI, },
journal={IEICE TRANSACTIONS on Information},
title={Genesis of the Mechanical Heart Valves' Ultrasonic Closing Clicks},
year={2009},
volume={E92-D},
number={4},
pages={717-722},
abstract={A new in vitro experimental tool was developed to study the mechanism of the ultrasonic closing clicks' genesis of mechanical heart valves. Since the newly developed tester adopted compressed air flow directly instead of the blood analog fluid to drive the mechanical heart valve, it is not possibe to generate any cavitation. Closing clicks were measured with a small accelerometer at the surface of the valve holder made of silicone rubber. Ultrasonic closing clicks as well as audible closing clicks, similar to those measured clinically, could be observed using this setup. Thus, it was confirmed that the ultrasonic closing clicks can be generated without the existence of cavitation. Simultaneous measurements of the valve motion were made with a high-speed video camera, and the analysis of the video frames and clicks showed that higher frequency signal components of more than 50 kHz could be generated only at the instant of the closure, which means the collision of the occluder with the housing. Eighteen miniature accelerometers with an area of one square millimeter were developed and stuck on the housing to monitor the distribution of the housing vibrations in detail, and it was found that the vibrations correspond to the ultrasonic closing clicks propagated from the valve stop: the collision point of the occluder with the housing. This fact indicated that the generation of ultrasonic closing clicks are limited to the small area of the collision. From those results, it was concluded that the major origin of the ultrasonic closing clicks' genesis should be the collision of the occluder with the housing.},
keywords={},
doi={10.1587/transinf.E92.D.717},
ISSN={1745-1361},
month={April},}
Salinan
TY - JOUR
TI - Genesis of the Mechanical Heart Valves' Ultrasonic Closing Clicks
T2 - IEICE TRANSACTIONS on Information
SP - 717
EP - 722
AU - Jun HASEGAWA
AU - Kenji KOBAYASHI
PY - 2009
DO - 10.1587/transinf.E92.D.717
JO - IEICE TRANSACTIONS on Information
SN - 1745-1361
VL - E92-D
IS - 4
JA - IEICE TRANSACTIONS on Information
Y1 - April 2009
AB - A new in vitro experimental tool was developed to study the mechanism of the ultrasonic closing clicks' genesis of mechanical heart valves. Since the newly developed tester adopted compressed air flow directly instead of the blood analog fluid to drive the mechanical heart valve, it is not possibe to generate any cavitation. Closing clicks were measured with a small accelerometer at the surface of the valve holder made of silicone rubber. Ultrasonic closing clicks as well as audible closing clicks, similar to those measured clinically, could be observed using this setup. Thus, it was confirmed that the ultrasonic closing clicks can be generated without the existence of cavitation. Simultaneous measurements of the valve motion were made with a high-speed video camera, and the analysis of the video frames and clicks showed that higher frequency signal components of more than 50 kHz could be generated only at the instant of the closure, which means the collision of the occluder with the housing. Eighteen miniature accelerometers with an area of one square millimeter were developed and stuck on the housing to monitor the distribution of the housing vibrations in detail, and it was found that the vibrations correspond to the ultrasonic closing clicks propagated from the valve stop: the collision point of the occluder with the housing. This fact indicated that the generation of ultrasonic closing clicks are limited to the small area of the collision. From those results, it was concluded that the major origin of the ultrasonic closing clicks' genesis should be the collision of the occluder with the housing.
ER -