| 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) is 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). The 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 is configured to limit excessive off-axis and angular movements of small diameter surgical instruments and the second position is configured to accommodate an unrestricted use of large diameter surgical instruments in the passageway.
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