Department of Mechano-Informatics, Graduate School of Information Science and Technology, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.
Surg Endosc. 2011 Jul;25(7):2296-301. doi: 10.1007/s00464-010-1551-7. Epub 2011 Feb 7.
To develop a new endoscope for performing simple surgical tasks inside the blood-filled cardiac atrium/chamber, that is, "off-pump" cardiac surgeries.
We developed the endoscope system with plasma flushing and coaxial round jet nozzle. The "plasma flushing" system was invented to observe the interior of the blood-filled heart by displacing blood cells in front of the endoscope tip. However, some areas could not be observed with simple flushing of the liquid because the flushed liquid mixed with blood. Further, a large amount of liquid had to be flushed, which posed a risk of cardiac damage caused by excess volume. Therefore, to safely capture high-resolution images of the interior of the heart, an endoscope with a coaxial round jet nozzle through which plasma is flushed has been developed. And to reduce the volume of flushed liquid, the synchronization system of heartbeat and the endoscope system with plasma flushing has been developed.
We conducted an in vivo experiment to determine whether we could observe intracardiac tissues in swine without the use of a heart-lung machine. As a result, we successfully observed intracardiac tissues without using a heart-lung machine. By using a coaxial nozzle, we could even observe the tricuspid valve. Moreover, we were able to save up to 30% of the flushed liquid by replacing the original system with a synchronization system. And we evaluated the performance of the endoscope with the coaxial round jet nozzle by conducting fluid analysis and an in vitro experiment.
We successfully observed intracardiac tissues without using a heart-lung machine. By using a coaxial nozzle, we could even observe the tricuspid valve. And by replacing an original system to a synchronization system, we were able to save up to 30% of the flushed liquid. As a follow-up study, we plan to create a surgical flexible device for valve disease that can grasp, staple, and repair cardiac valves by endoscopic visualization.
为了在充满血液的心脏心房/室内进行简单的手术任务，即“非体外循环”心脏手术，开发一种新的内窥镜。
我们开发了带有等离子体冲洗和同轴圆形射流喷嘴的内窥镜系统。“等离子体冲洗”系统是为了通过在内窥镜尖端前方置换血细胞来观察充满血液的心脏内部而发明的。但是，由于冲洗的液体与血液混合，仅通过液体的简单冲洗就无法观察到某些区域。此外，由于必须冲洗大量液体，因此存在因过量体积而导致心脏损伤的风险。因此，为了安全地捕获心脏内部的高分辨率图像，开发了一种带有同轴圆形射流喷嘴的内窥镜，该喷嘴通过等离子体冲洗。为了减少冲洗液的体积，开发了一种与心跳同步的内窥镜系统和带有等离子体冲洗的内窥镜系统。
我们进行了一项体内实验，以确定是否可以在不使用心肺机的情况下观察猪的心脏内组织。结果，我们成功地观察了没有使用心肺机的心脏内组织。通过使用同轴喷嘴，我们甚至可以观察三尖瓣。此外，通过用同步系统替换原始系统，我们可以节省多达 30%的冲洗液。并且我们通过进行流体分析和体外实验来评估带有同轴圆形射流喷嘴的内窥镜的性能。
我们成功地观察了没有使用心肺机的心脏内组织。通过使用同轴喷嘴，我们甚至可以观察三尖瓣。并且通过用同步系统替换原始系统，我们可以节省多达 30%的冲洗液。作为后续研究，我们计划创建一种用于瓣膜疾病的手术柔性设备，该设备可以通过内窥镜可视化来抓取、钉合和修复心脏瓣膜。
