Cardiovascular surgery drainage device

A cardiovascular surgery drainage device effectively solves the problems that a conventional cardiovascular surgery drainage device cannot control the drainage speed, effusion possibly flows back to infect the affected part of a patient, medical workers need to fix the position when the cardiovascular surgery drainage device is used, a drainage bag cannot be repeatedly used, and the environment-friendly concept is not met. A support is fixedly connected to the upper portion of the middle of the base, a supporting rod is fixedly connected to the rear side of the middle of the support, a protection cover is fixedly connected to the rear side of the upper end of the support, and a blocking rod is slidably connected to the rear portion of the left side of the protection cover. A driven ring is arranged on the outer side of the incomplete gear, a limiting hole is formed in the upper portion of the rear end of the protection cover and slidably connected with the driven ring, the rear end of the protection cover is