US 11,779,752 B2
Output pivot for a magnetic coupling cardiac pump
Mohammad Haddadi, Merignac (FR); Stéphane Garrigue, Begles (FR); Maryam Haddadi, Merignac (FR); and Arnaud Mascarell, Montbazon (FR)
Assigned to FINEHEART, Pessac (FR)
Appl. No. 17/594,244
Filed by FINEHEART, Pessac (FR)
PCT Filed Mar. 27, 2020, PCT No. PCT/EP2020/058870
§ 371(c)(1), (2) Date Oct. 7, 2021,
PCT Pub. No. WO2020/207834, PCT Pub. Date Oct. 15, 2020.
Claims priority of application No. 1903838 (FR), filed on Apr. 10, 2019.
Prior Publication US 2022/0152375 A1, May 19, 2022
Int. Cl. A61M 1/10 (2006.01); A61M 1/12 (2006.01); A61M 60/237 (2021.01); A61M 60/148 (2021.01); A61M 60/825 (2021.01); A61M 60/422 (2021.01); A61M 60/82 (2021.01); A61M 60/178 (2021.01)
CPC A61M 60/237 (2021.01) [A61M 60/148 (2021.01); A61M 60/178 (2021.01); A61M 60/422 (2021.01); A61M 60/82 (2021.01); A61M 60/825 (2021.01)] 13 Claims
OG exemplary drawing
 
1. A pump intended to be immersed in a fluid, the pump comprising an upper part and a lower part when said pump is positioned vertically, the pump also comprising:
a casing;
a brushless motor unit at a lower part of the pump formed by:
a stator in which first magnetic elements are arranged,
a rotor comprising second magnetic elements intended for magnetic coupling with the first magnetic elements of the stator;
a transmission shaft connected to the rotor and constituting an impeller in its top part, the impeller being at the upper part of the pump;
at the upper part of the pump, the impeller comprises at an apex, an outlet pivot suitable for cooperating with a guide fixed to the casing, said guide having a shape complementary to that of the outlet pivot so as to hold said pivot stable in rotation and to form a clearance between the outlet pivot and the guide, and said guide comprises a central opening within the axis of revolution of the outlet pivot for a passage for fluid from the interior of the casing to the exterior, via the clearance and the opening, and in that the outlet pivot is convex, having a hemispherical, conical or pyramidal shape; and
the motor unit is a brushless motor with an external rotor;
the casing is provided with a top part comprising an upper end, the upper end of the casing forming a propulsion chamber propelling fluid towards the top part of the casing, and a bottom part, the bottom part forming a stator and being attached in a fixed manner to the top part of the casing;
the pump comprises at least one side opening between the top part of the casing and the bottom part of the casing, and forming an inlet chamber for the fluid to enter from the exterior towards the propulsion chamber;
the rotor is in the form of a bell at least partially covering the stator head, the bell having at least one opening in its top part so as to create a reverse flow of the fluid from the inlet chamber right up to the base of the stator via a passage between the rotor and the stator; and
the transmission shaft comprises at least one connecting arm making it possible to hold the bell above the stator, the axis of the transmission shaft being superposed with the axis of rotation of the bell,
said pump is an intraventricular heart pump intended to be fixed at the apex of a heart, the passage between the rotor and the stator opening directly in the zone where the internal wall of the ventricle and the external wall of the stator meet,
and said pump has dimensions such that the inlet chamber is located at a distance of 1 to 3 cm from the apex and the outlet orifice of the pump is located in the interior of the ventricle at a distance of 1 to 3 cm upstream of the aortic valve.