| 摘要 |
The lens at the tip of a laparoscopic camera is kept clean by creating a compartment in front of it pressurized by CO2 gas. The gas exits the compartment via a small aperture that also serves as an aperture for the optical system. The escaping gas is vented to the body cavity. Because of the small size of the aperture, even a small gas flow prevents fluids from entering the cavity and soiling the lens.
|
