Pump for liquid and gaseous fluids, especially blood

A pump for gas or liquid fluids, especially blood, comprising:

• a housing having a peripheral wall formed with a trochoidal surface having at least one lobe;
• a rotor formed as a rotary piston body in said housing having at least two edges defining respective seals with said surface;
• an eccentric in said rotor and rotatable relative thereto define a trochoidal movement for said rotor edges along said surface whereby said fluid is displaced by said rotor;
• an inlet port and an outlet port formed in said housing for delivering said fluid to and discharging said fluid from said housing;
• and
• drive means including an electric motor disposed within said rotor and planetary gear transmission means operatively connected to said rotor and to said motor whereby said rotor is driven to cause said trochoidal movement of said edges along said surface and eccentric rotation of said rotor in said housing, said drive means having an eccentric shaft extending toward a lateral wall of said housing, and journaled for rotation relative thereto, said eccentric shaft being offset from a shaft of said motor, and defining an eccentric axis for said rotor at said lateral wall of said housing, and rotating contact means cooperating with said eccentric shaft at said lateral wall for energizing said electric motor.