摘要 |
A trocar (18) is provided with a cannula (21) and a housing (23) and valve assembly (50) disposed in the housing (23) which forms a housing seal, and instrument seal, and in some cases a zero seal (58). A gel material (54) is included in the valve and provides the valve with superior flotation properties for maintaining the instrument seal even when the instrument is moved off-axis. In order to accommodate movement of the gel material (54), voids can be formed within the valve housing (23) and even within the gel material (54).
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