A system and method for removing gas bubbles from blood during circulatory assist procedures. An active filter apparatus forces the bubbles to the center of the system where they are removed from the blood before the blood exits the filter.

A cyclone filter for separating heavy particles from water or any other liquid including a head to introduce the liquid into the filter, causing the liquid to swirl enhanced by an internal shape of head and flow of liquid takes turn around vertex pipe, the liquid containing solid foreign matter, a vertical vertex pipe to lead clean water out of the filter, a vane to separate head from separation chamber, a hollow cylindrical separation chamber where particles of more mass will be pushed away from the central axis and towards the wall due to increased flowrate and swirling action, a collection tank to collect the dropped particles, where the vane includes curved surfaces with substantially elliptical pathways perpendicular the vertex pipe that enhance the velocity of flow and its swirling action.

A cyclone filter for separating heavy particles from water or any other liquid including a head to introduce the liquid into the filter, causing the liquid to swirl enhanced by an internal shape of head and flow of liquid takes turn around vertex pipe, the liquid containing solid foreign matter, a vertical vertex pipe to lead clean water out of the filter, a vane to separate head from separation chamber, a hollow cylindrical separation chamber where particles of more mass will be pushed away from the central axis and towards the wall due to increased flowrate and swirling action, a collection tank to collect the dropped particles, where the vane includes curved surfaces with substantially elliptical pathways perpendicular the vertex pipe that enhance the velocity of flow and its swirling action.

A foreign matter removal device removes foreign matter contained in a fluid. The fluid is caused to flow into the trap portion and is separated into an inner fluid flowing inside a separation portion and an outer fluid flowing outside the separation portion. First foreign matter contained in the outer fluid and having a higher specific gravity than the fluid is captured in a gap between an inner wall of the trap portion and the separation portion. Separation of second foreign matter contained in the inner fluid and having a lower specific gravity than the fluid is promoted by a gas-liquid separation portion, and the second foreign matter is discharged to outside, through a foreign-matter-discharging-means-connection portion provided in a ceiling on the vertically upper side at a center part of the trap portion, from foreign-matter-discharging means.