2. Free access for internal guiding core, efficiently to support drainage catheter inserting.
3. An arc surface in the head and the depth mark at tube.
4. Smooth and inner and outer tubewalls, a good flexible and elastic performance, efficiently to ensure the attraction and drainage.
Application In cardiac operation, it is used for attracting the blood in left atrium through a trial sepal or upper lung vein, inserting in left atrium.
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