Drainage device comprising a filter cleaning device

A filtering device configured for removing particles from a bodily fluid of a patient, the filtering device configured fur implantation into the patient's body, the filtering device comprising:

• a tube comprising a main fluid passageway from an inlet to an outlet of the filtering device of a bodily fluid, and further comprising first and second openings to a first and second apertures provided in a housing of the filtering device extending substantially perpendicular relative the longitudinal axis of the fluid main passageway between the inlet and the outlet,
• a first piston provided within the first aperture when being in a retracted position and, in an extended position, movable through and substantially perpendicular to, the main fluid passageway within the tube, the first piston comprising:
• a plurality of channels as a first part of the cleaning device for accommodating portions of a filter provided between the first and second openings of the first and second apertures when the first piston is in the extended position extending through the main fluid passageway between the first opening and the second openings of the first and second apertures;
• through holes each having an axis substantially parallel to the longitudinal axis of the main fluid passageway and configured to allow a flow through the main fluid passageway of the bodily fluid through the filter when the first piston is in the extended position:
• an outer end portion facing the main fluid passageway provided with a first recess, as a second part of the cleaning device, configured to extend into the main fluid passageway with the first piston in the extended position to collect said particles filtered by said filter into a cavity formed by the first piston and a second piston within the second aperture opposite said first aperture when in an extended position;
• the filter having a least one portion, each portion substantially perpendicular to the longitudinal axis of the tube and substantially covering the main fluid passageway between the first and second openings of the first and second apertures, the filter being configured to filter the particles from the bodily fluid passing through the main fluid passageway of the tube,
• the first and second parts of the filter cleaning device provided in the first piston and configured for cleaning the filter, the filter cleaning device being in contact with the filter and configured to remove particles from the filter, where the first piston is configured to move from the retracted position to the extended position, such that the channels as the first part of the filter cleaning device and the recess of the outer end portion as the second part of the filter cleaning device remove the particles from the at least one portion of the filter into the aperture and then into the recess in order to clean the filter, the removed particles collected in the cavity within the second recess;
• the cavity for receiving the removed particles, the cavity further being configured to have the removed particles removed from the cavity,
• wherein the filtering device is configured to filter particles from the bodily fluid moving through the main fluid passageway through the filtering device inlet via the filter to the outlet;
• and
• wherein the filter comprises a plurality of openings configured to allow bodily fluid to pass through the filter when the first piston is in the retracted or extended position.