| 摘要 |
A surgical access instrument for use during the course of a minimally invasi ve surgical procedure, includes an access member defining a longitudinal axis a nd having a longitudinal opening for reception and passage of a surgical object, a valve membrane mounted to the access member defining at least one internal cavity and permitting passage of the surgical object and a dynamic fluid disposed within the internal cavity. The dynamic fluid is adapted to transition from a first state to a second state upon exposure thereof to a stimulus to assist in stabilizing the surgical object relative to the access member. In its first state, the fluid defines a first set of physical attributes, including but not being limited to viscosi ty and density, that allow for the displacement of the fluid, whereas in the second state, the fluid defines a second, dissimilar set of physical attributes, e.g., a greater viscosity and a great er density, that substantially limit displacement of the fluid.
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