Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1998-09-28
1999-09-28
Dawson, Glenn K.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
606185, 600201, A61M 500, A61B 1734, A61B 122
Patent
active
059579021
ABSTRACT:
A surgical tool of the type used with a trocar expands the diameter of a puncture opening made in a body cavity so that a linear incision is not needed in certain surgical procedures. An elongate base member of cylindrical construction is divided into a plurality of parts by cuts that extend the longitudinal extent of the base member in circumferentially spaced relation to one another and the parts are bound together and held into a solid cylindrical configuration by a plurality of longitudinally spaced apart bias members such as rubber bands. A plunger has an elongate leading end that drives the base member parts in a radially outward direction, increasing the diameter of the puncture opening, when it is inserted into the base member. The bias members restore the parts of the base member to their position of repose when the leading end of the plunger is withdrawn from the base member. The trailing end of the base member is received within a transversely disposed housing that helps hold the assembly together as the parts of the base member are expanded or retracted. To use the tool, a trocar punctures the cavity and carries part of the leading end of the base member into the cavity. The trocar is withdrawn, leaving the base member in place, and the leading end of the plunger is then inserted into the base member to expand it. Surgical tools are sequentially inserted through the bore of the leading end of the plunger. The diameter of that bore is sufficient to enable removal of an enlarged gall bladder or the like from the cavity.
REFERENCES:
patent: 5176659 (1993-01-01), Mancini
patent: 5320611 (1994-06-01), Bonutti et al.
patent: 5814073 (1998-09-01), Bonutti
Dawson Glenn K.
Maynard Jennifer
Smith Ronald E.
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