Threaded cannula depth limiter

A depth limiter configured to couple with a cannula tube of a trocar having at least one helical tissue engagement feature disposed along an outer surface of the cannula tube, the depth limiter comprising:

• (a) a first body portion;
• (b) a second body portion movably coupled to the first body portion such that the first and second body portions are movable relative to each other between a fine adjustment configuration and a coarse adjustment configuration;
• (c) a first protrusion presented by the first body portion and extending radially inwardly relative to a central axis of the depth limiter;
• and
• (d) a second protrusion presented by the second body portion and extending radially inwardly relative to the central axis of the depth limiter,
• wherein in the fine adjustment configuration at least one of the first or second protrusions is configured to selectively threadably engage the at least one helical tissue engagement feature of the cannula tube, wherein in the coarse adjustment configuration the first and second protrusions are configured to selectively threadably disengage the at least one helical tissue engagement feature of the cannula tube,
• wherein the first and second body portions are rotatable relative to each other about the central axis of the depth limiter between a clocked configuration in which the first and second protrusions are radially aligned with each other and an unclocked configuration in which the first and second protrusions are radially misaligned from each other, wherein the clocked configuration at least partially defines the coarse adjustment configuration and the unclocked configuration at least partially defines the fine adjustment configuration.

A surgical access device assembly comprising:

• (a) a cannula including:
• (i) a working channel configured to guide a surgical instrument along a central axis of the cannula, and
• (ii) a helical tissue engagement protrusion disposed along an outer surface of the cannula, wherein the helical tissue engagement protrusion is configured to stabilize the cannula relative to a body cavity wall of a patient when the cannula is inserted distally through the body cavity wall;
• and
• (b) a depth limiter movably coupled with the cannula and configured to limit a depth of the cannula relative to the body cavity wall, wherein the depth limiter comprises:
• (i) a first body portion that extends about a central axis of the depth limiter, and
• (ii) a second body portion that extends about the central axis,
• wherein the first and second body portions are rotatable relative to each other about the central axis and relative to the cannula between a fine adjustment configuration and a coarse adjustment configuration,
• wherein in the fine adjustment configuration at least one of the first or second body portions is threadably engaged with helical tissue engagement protrusion,
• wherein in the coarse adjustment configuration each of the first and second body portions is threadably disengaged from the helical tissue engagement protrusion such that the depth limiter is axially translatable relative to the cannula.