PNEUMOPERITONEUM-NADEL

摘要

A Veress needle instrument consists of a housing (1) serving as a handle, a hollow needle (21) having one end mounted in the housing and a pointed other end, a tube slidably mounted within the needle, the tube having one end sealed off and a side wall hole (31) proximate the sealed end, the other end of the tube passing through the hollow needle and into the length of a passageway of a spring (121) biased bobbin (29) mounted in the housing, with the other end being secured in the passageway. The passageway of the bobbin opens into a porthole thereof for receiving a fluid coupling through a hole in the top end of the housing, thereby permitting fluid to be passed directly between the tube and the fluid coupling. The bobbin is normally biased toward the bottom end of the housing, for causing the one end of the tube to extend away from a pointed end of the needle with the side hole of the tube unobstructed. When a force directed against the end of the tube causes it to retract into the needle, the bobbin moves toward the top end of the housing, causing a colored portion of the bobbin to protrude out of the hole in the top end of the housing, for providing a visual indication that the one end of the tube has retracted into the needle.