发明授权
US4944724A Apparatus for locating body cavities having signaling indicator 失效
用于定位具有信号指示器的体腔的装置

Apparatus for locating body cavities having signaling indicator
摘要:
An apparatus for locating a body cavity having a fluctuating fluid pressure by signaling the fluctuating pressure when the cavity is entered and then transporting fluid either into or out of the cavity.
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