| 摘要 |
A diameter reduction mechanism for a fixed seal trocar employing a movable reduction member pivotally connected with a housing (20). The housing (20) i s adapted to be mounted on a proximal end of a valve assembly (120) of the trocar (100). The reduction member (50) defines a hole (71) aligned with a passageway (150) defined by the trocar (100). The hole (71) defines an operable area less than an operable area defined by the passageway (150). Th e diameter reduction mechanism is configured for the ease of selectively employing the reduction member (50) between a first position reducing the operable area of the passageway (150) and a second position wherein the reduction member (50) is clear of the passageway (150). The first position i s configured to limit excessive off-axis and angular movements of small diamet er surgical instruments and the second position is configured to accommodate an unrestricted use of large diameter surgical instruments in the passageway.</ SDOAB>
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