ostium

基本解释

This technique enables a "single shot" PVI by placing the balloon at the PV ostium and ablating circumferentially around the PV ostia with a single energy application, the researchers explain.
研究人員解釋說這項技術能通過置於肺靜脈口的球囊單次射出“一槍”的能量環形消融肺靜脈口。
In cases where the posterior fontanel is identified, the division between the natural ostium and the fontanel should be resected to allow free communication between the two.
如果確定有前鹵存在，應該將前鹵和上頜竇口之間的間隔切除，使兩者相通。
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Programmed stimulation was delivered at coronary sinus ostium, distal coronary sinus and lateral wall of left atrium.
分別通過冠狀竇口電極、冠狀竇遠耑電極和左房側壁電極進行程控刺激。

Each is lined with tissue called the mucosa, which secretes mucus continuously along hairy cells called cilia and out a tiny passageway called an ostium, through which the mucus drains into the nasal cavity and down the back of the throat, where it is swallowed (unless you blow your nose).
FORBES: Balloon Therapy
They ended up producing a flexible catheter tube that goes a bit of the way up the nostrils, then a guide wire is inserted into the targeted sinus. (In live patients this is done via an endoscope and fluoroscope.) A balloon catheter is advanced over the guide wire and positioned against the blocked ostium.
FORBES: Balloon Therapy