| 摘要 |
Disclosure of methods and apparatus providing bases for design of compact small bore medical needle retraction safety devices (10, 60', 60", 400, 600) wherein actuators (170, 630) are displaced away from slender needle sheathing bodies (40, 40', 40", 410) to initiate a needle retraction cycle for safely containing a medical needle (70) after use. Four embodiments of the instant invention are disclosed. In one embodiment (10, 60, 60'), needle retracting energy is stored as a medical needle (70) is extended for use and is expended to retract the needle (70) into safe containment. Other embodiments (400, 600) comprise power assist mechanisms (430, 440, 490, 510, 512, 514, 610, 640) which store energy during an initial phase of needle retraction to be used t o enhance and assist needle retraction during a needle retraction completing phase. In some embodiments (60, 60"), retraction is facilitated b y a pair of rigid, elongated, hingedly interconnected arms (90, 100, 90', 100'), which are further hingedly coupled to a needle hub assembly (30) and to a device body (40, 40') such that one arm (100, 100') is rotated approximately 180.degree. to retract the needle (30) a distance greater than the length of the rotated arm (100, 100') to facilitat e retraction actuation. One power assist mechanism comprises a part (192) mold ed as a distortable member of one of the arms (90).
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