Abstract: A surgical helmet assembly including a ventilation system for circulating air around the head of a user. The surgical helmet assembly includes a surgical helmet including a brow bar to be positioned around the head of the user and a chin bar extending from the surgical helmet to be positioned in front of the chin of the user. The chin bar and brow bar include an airflow channel in fluid communication with a fan at the rear of the surgical helmet. The fan generates a flow of air from an airflow inlet at the rear of the surgical helmet through the airflow channel in the chin bar to an airflow outlet in the chin bar and past a user's face in an upward direction and through the airflow channel in the brow bar to an airflow outlet in the brow bar and upward over the user's head.

Abstract: A medical waste fluid collection cart may include one or more sensors, a controller in communication with at least one of the sensors, and a memory coupled to the controller, the memory configured to store one or more algorithms, measurement correlations, and/or look-up tables relating sensed measurements to concentrations of waste fluid received from a surgical site. The fluid collection cart may further include a container and a suction tube having a lumen extending through the suction tube, where the suction tube may communicate with the container to deposit waste fluid from a surgical site in the container. One or more of the sensors may include a light sensor for sensing a measure related to a concentration of blood in the waste fluid removed from a surgical site. The controller may determine a blood loss quantity from identifying an average blood concentration in the waste fluid removed from the surgical site.

Abstract: A surgical helmet assembly including a ventilation system for circulating air around the head of a user. The surgical helmet assembly includes a surgical helmet including a brow bar to be positioned around the head of the user and a chin bar extending from the surgical helmet to be positioned in front of the chin of the user. The chin bar and brow bar include an airflow channel in fluid communication with a fan at the rear of the surgical helmet. The fan generates a flow of air from an airflow inlet at the rear of the surgical helmet through the airflow channel in the chin bar to an airflow outlet in the chin bar and past a user's face in an upward direction and through the airflow channel in the brow bar to an airflow outlet in the brow bar and upward over the user's head.