Detachable pusher-vasoocclusive coil assembly with interlocking coupling

摘要

A detachable pusher-vasoocclusive coil assembly (11) for use in occluding a selected site within a vessel, comprising in combination: a vasoocclusive coil (13) having a proximal end; and a pusher (12) having a distal end; characterised in that: a first radial protuberance (16) is carried on the proximal end of the coil solely by means of a proximally extending wire (15); a second radial protuberance (20) is carried on the distal end of the pusher (12) solely by means of a distally extending wire (19); said radial protuberances (16,20) are adapted to be engaged by being axially overlapped and interlocked, with the first protuberance (16) positioned proximally of the second protuberance (20), with the proximally extending wire (15) extending axially past the second protuberance (20) and with the distally extending wire (19) extending axially past the first protuberance (16); and the assembly further comprises means (14,21) carried coaxially about the pusher (12) and coil (13) that is axially movable relative to the coil and pusher from a first position, in which the means radially encloses the engaged protuberances (16,20) to prevent them from substantial radial movement relative to each other to prevent their disengagement, to a second position in which the means does not radially enclose the protuberances and the protuberances are free to disengage.