发明授权
US3608061A Radiopaque esophageal marshmallow bolus 失效
RADIOPAQUE ESOPHAGEAL MARSHMALLOW BOLUS

Radiopaque esophageal marshmallow bolus
摘要:
A radiopaque esophageal bolus which comprises a marshmallow containing a radiopaque material in an amount sufficient to render the bolus opaque when exposed to X-rays or roentgen rays.
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