| 摘要 |
A cardiac stimulator lead (10) is provided that includes a connector (16) for connecting to a cardiac stimulator (24) and a tubular insulating sleeve (12) that has a first end (14) coupled to the connector and a second end (18). An electrode (20) is coupled to the second end and has a longitudinal bore. An extendable/retractable corkscrew (26) is positioned in the bore. In one aspect, the lead includes a radiopaque member moveable with the corkscrew to verify axial movement. In another aspect, the bore is configured so that the corkscrew will not extend fully unless tissue is present to engage the corkscrew. In another aspect, a shape-memory polymeric washer is included to restrict fluid influx after corkscrew deployment.
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