An apparatus comprising: a cannula comprising a shape memory material configured to provide the cannula with a shape closely matched to the anatomy of the right ventricle of the human heart, wherein the cannula has: an inflow port configured to be located proximal the inferior vena cava; an outflow port configured to be located proximal the pulmonary artery; a primary section corresponding to the path from a diaphragm fibrous ring in the IVC to the IVC to right atrium transition (IVC-RA), extending in a first direction; a secondary section corresponding to the path from the IVC-RA to the tricuspid valve, extending in a second direction different to the first direction; a tertiary section corresponding to the path from the TV to the pulmonary valve, extending in a third direction different from the first and second directions; and a quaternary section corresponding to the path between the PV and the left branch of the PA, extending in a fourth direction, different from the first, second and third directions, wherein: the primary section extends from a point A to a point B and includes the inflow port proximal point A; the secondary section extends from said point B to a point C; the tertiary section extends from said point C to a point D; and the quaternary section extends from said point D to a point E, having the outflow port proximal said point E; wherein: the primary, secondary and tertiary sections (1, 2, 3) lie substantially in a first plane containing said points A, B, and C; and the quaternary section lies substantially in a second plane containing points C, D, and E, the second plane being oriented to the first plane at an angle of about 30 degrees. an inflow port configured to be located proximal the inferior vena cava; an outflow port configured to be located proximal the pulmonary artery; a primary section corresponding to the path from a diaphragm fibrous ring in the IVC to the IVC to right atrium transition (IVC-RA), extending in a first direction; a secondary section corresponding to the path from the IVC-RA to the tricuspid valve, extending in a second direction different to the first direction; a tertiary section corresponding to the path from the TV to the pulmonary valve, extending in a third direction different from the first and second directions; and a quaternary section corresponding to the path between the PV and the left branch of the PA, extending in a fourth direction, different from the first, second and third directions, wherein: the primary section extends from a point A to a point B and includes the inflow port proximal point A; the secondary section extends from said point B to a point C; the tertiary section extends from said point C to a point D; and the quaternary section extends from said point D to a point E, having the outflow port proximal said point E; wherein: the primary, secondary and tertiary sections (1, 2, 3) lie substantially in a first plane containing said points A, B, and C; and the quaternary section lies substantially in a second plane containing points C, D, and E, the second plane being oriented to the first plane at an angle of about 30 degrees. the primary section extends from a point A to a point B and includes the inflow port proximal point A; the secondary section extends from said point B to a point C; the tertiary section extends from said point C to a point D; and the quaternary section extends from said point D to a point E, having the outflow port proximal said point E; wherein: the primary, secondary and tertiary sections (1, 2, 3) lie substantially in a first plane containing said points A, B, and C; and the quaternary section lies substantially in a second plane containing points C, D, and E, the second plane being oriented to the first plane at an angle of about 30 degrees. the primary, secondary and tertiary sections (1, 2, 3) lie substantially in a first plane containing said points A, B, and C; and the quaternary section lies substantially in a second plane containing points C, D, and E, the second plane being oriented to the first plane at an angle of about 30 degrees.