Medical devices comprising a ventilation mechanism and related methods and systems

A medical device, comprising:

• a handle including:
• a hub defining a lumen and a proximal opening configured to receive a shaft of a medical instrument, wherein the hub includes at least one aperture;
• a suction port in fluid communication with the lumen of the hub and configured to be connected to a vacuum source;
• and
• a ventilation mechanism including a housing coupled to the hub;
• and
• a sheath coupled to the handle and defining a channel in fluid communication with the lumen of the hub;
• wherein the ventilation mechanism includes an actuator movable relative to the hub to cover and uncover the at least one aperture, the actuator being an outer surface of the housing or coupled to and slidable relative to the housing.

A medical device, comprising:

• a handle including:
• a hub defining a lumen and a proximal opening configured to receive a shaft of a medical instrument, wherein the hub includes at least one aperture;
• a suction port in fluid communication with the lumen and configured to be connected to a vacuum source;
• and
• a ventilation mechanism including a housing coupled the hub proximate the at least one aperture, wherein the housing is slidable relative to the hub to cover and uncover the at least one aperture;
• and
• a sheath coupled to the handle and defining a channel in fluid communication with the lumen of the hub.