A cardiac pump (101, 201, 301) comprising: a plain bearing assembly (126, 226, 326) comprising a first plain bearing portion (126a, 226a, 326a) and a second plain bearing portion (126b, 226b, 326b), the first plain bearing portion (126a, 226a, 326a) being coupled to a cardiac pump rotor (108, 208, 308) and the second plain bearing portion (126b, 226b, 326b) being coupled to a cardiac pump housing (107, 207, 308), the plain bearing assembly (126, 226, 326) being configured to rotatably support the cardiac pump rotor (108, 208, 308) within the cardiac pump housing (107, 207, 307) in at least an axial direction of the cardiac pump rotor (108, 208, 308)； and a magnetic bearing assembly (136, 236, 336) comprising a first magnetic bearing portion (136a, 236a, 336a) and a second magnetic bearing portion (136b, 236b, 336b), the first magnetic bearing portion (136a, 236a, 336a) being coupled to the cardiac pump rotor (108, 208, 308) and the second magnetic bearing portion (136b, 236b, 336b) being coupled to the cardiac pump housing (107, 207, 307), the magnetic bearing assembly (136, 236, 336) being configured to rotatably support the cardiac pump rotor (108, 208, 308) within the cardiac pump housing (107, 207, 307) in a radial direction of the cardiac pump rotor (108, 208, 308) and bias the cardiac pump rotor (108, 208, 308) in the axial direction such that the magnetic bearing assembly (136, 236, 336) provides a preload force to preload the plain bearing assembly (126, 226, 326).L'invention concerne une pompe cardiaque (101, 201, 301) comprenant : un ensemble support lisse (126, 226, 326) comprenant une première partie de support lisse (126a, 226a, 326a) et une seconde partie de support lisse (126b, 226b, 326b), la première partie de support lisse (126a, 226a, 326a) étant accouplée à un rotor de pompe cardiaque (108, 208, 308) et la seconde partie de support lisse (126b, 226b, 326b) étant accouplée à un boîtier de pompe cardiaque (107, 207, 308), l'ensemble support lisse (
