名词
中文翻译：额外冠状支架
同义词：
['extra-coronary stent', 'extracoronary implant', 'extracoronary support']
例句：
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1. The extracoronary retainer was designed to prevent the heart from moving too much during surgery.
额外的冠状支架被设计来防止心脏在手术期间过度移动。
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2.The patient's condition improved significantly after receiving the extracoronary retainer.
接受额外冠状支架治疗后，患者的病情有显著改善。
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3. The extracoronary retainer was removed after a few weeks due to complications.
由于并发症，几周后取出了额外的冠状支架。