Blood pump for mechanical circulatory support for Fontan patients

Patent metadata

Field	Value
Publication number	US-12109404-B2
Application number	US-201916973832-A
Country	US
Kind code	B2
Filing date	Jun 11, 2019
Priority date	Jun 11, 2018
Publication date	Oct 8, 2024
Grant date	Oct 8, 2024

Abstract

The invention relates to a radial blood pump ( 1 ) for supporting a blood flow ( 106 ) in a human or animal heart ( 205 ) comprising a first and a second inlet channel ( 41, 42 ), a first outlet channel ( 51, 52 ), a first electric motor ( 71 ) comprising a first stator ( 77 ) and a first internal rotor ( 75 ), wherein the first electric motor ( 71 ) is configured to drive an impeller ( 2, 2 a, 2 b ) arranged at an intersection of the first with the second inlet channel ( 41, 42 ), wherein the impeller ( 2, 2 a, 2 b ) is connected to the first internal rotor ( 75 ) and wherein the impeller ( 2, 2 a, 2 b ) comprises a merging portion ( 22 ) arranged at the intersection, where a merging of a first blood flow ( 106 ) coming from the first inlet channel ( 41 ) and a second blood flow ( 107 ) coming from the second inlet channel ( 42 ) takes place, wherein the impeller ( 2, 2 a, 2 b ) is configured to pump the first and second blood flow ( 106, 107 ) from the first and second inlet channel ( 41, 42 ) via the merging portion ( 22 ) to the first outlet channel ( 51 ), a plurality of blades ( 20 ) comprised by the impeller ( 2, 2 a, 2 b ), wherein the blades ( 20 ) form blade channels ( 21 ) comprised by the merging portion ( 22 ), wherein each blade ( 20 ) is arranged and configured to pump the first and second blood ( 106, 107 ) flow entering through the first and the second inlet channel ( 41, 42 ) towards the outlet channel ( 51 ), wherein the blood pump ( 1 ) is arranged and configured such that the first blood flow ( 106 ) and the second blood flow ( 107 ) meet at the merging portion ( 22 ), such that a pressure difference between the first and second blood flow ( 106, 107 ) is reduced before blood from first and second blood flow ( 106, 107 ) is pumped to the first outlet channel ( 51 ).

First claim

The invention claimed is:

1. A radial blood pump ( 1 ), for supporting a blood flow ( 106 ) in a human or animal heart ( 205 ) comprising at least the following components:
A first and a second inlet channel ( 41 , 42 ),
A first outlet channel ( 51 , 52 ),
A first electric motor ( 71 ) comprising a first stator ( 77 ) and a first internal rotor ( 75 ), wherein the first electric motor ( 71 ) is configured to drive
An impeller ( 2 , 2 b ) arranged at an intersection of the first with the second inlet channel ( 41 , 42 ), wherein the impeller ( 2 , 2 b ) is connected to the first internal rotor ( 75 ) and wherein the impeller ( 2 , 2 b ) comprises a merging portion ( 22 ) arranged at the intersection, where a merging of a first blood flow ( 106 ) coming from the first inlet channel ( 41 ) and a second blood flow ( 107 ) coming from the second inlet channel ( 42 ) takes place, wherein the impeller ( 2 , 2 b ) is configured to pump the first and second blood flow ( 106 , 107 ) from the first and second inlet channel ( 41 , 42 ) via the merging portion ( 22 ) to the first outlet channel ( 51 ),
A plurality of blades ( 20 ) comprised by the impeller ( 2 , 2 b ), wherein the blades ( 20 ) form blade channels ( 21 ) comprised by the merging portion ( 22 ), wherein each blade ( 20 ) is arranged and configured to pump the first and second blood ( 106 , 107 ) flow entering through the first and the second inlet channel ( 41 , 42 ) towards the outlet channel ( 51 ), wherein

the blood pump ( 1 ) is arranged and configured such that the first blood flow ( 106 ) and the second blood flow ( 107 ) meet at the merging portion ( 22 ), such that a pressure difference between the first and second blood flow ( 106 , 107 ) is reduced before blood from first and second blood flow ( 106 , 107 ) is pumped to the first outlet channel ( 51 ), wherein the impeller ( 2 b ) is a closed double-suction impeller, wherein the impeller ( 2 , 2 b ) comprises a first and a second shroud ( 24 ) at least partially covering the blades ( 20 ), and wherein the merging portion ( 22 ) comprises two eyes ( 23 ), wherein the radial blood pump ( 1 ) comprises a straight line fluidic passage between the first and the second inlet channel ( 41 , 42 ), wherein the straight line fluidic passage extends through the eyes ( 23 ) of the closed double suction impeller ( 2 , 2 b ).

2. Radial blood pump according to claim 1 , wherein the blood pump ( 1 ) comprises a second electric motor ( 72 ) comprising a second stator ( 78 ) and a second internal rotor ( 76 ), wherein the second internal rotor ( 76 ) is rigidly connected to the first internal rotor ( 75 ).

3. Radial blood pump according to claim 2 , wherein the first electric motor ( 71 ) is arranged in a first half space (S 1 ) extending from a plane ( 103 ) extending orthogonally from an axis of rotation ( 104 ) of the impeller ( 2 , 2 b ) comprising the first inlet channel ( 41 ) and the second electric motor ( 72 ) is arranged in a second half space (S 2 ) extending from the said plane ( 103 ) comprising the second inlet channel ( 42 ).

4. Radial blood pump according to claim 2 , wherein the radial blood pump ( 1 ) has a housing ( 3 ) comprising the first and/or the second stator ( 77 , 78 ), the housing ( 3 ) encasing at least the following components:
the impeller ( 2 , 2 b );
the first and/or the second internal rotor ( 75 , 76 );

wherein a distance ( 8 , 9 ) between an inner wall portion ( 30 ) of the housing ( 3 ) and said components is at least 0.25 mm, preferably at least 0.5 mm throughout the blood pump ( 1 ).

5. The radial blood pump according to claim 2 , wherein the second internal rotor ( 76 ) of the second electric motor ( 72 ) is arranged on the second shroud ( 24 ).

6. Radial blood pump according to claim 1 , wherein the impeller ( 2 , 2 b ) is a symmetric double-suction impeller ( 2 , 2 b ).

7. Radial blood pump according to claim 1 , wherein the two eyes ( 23 ) each have a diameter that is larger than 2.5 mm.

8. Radial blood pump according to claim 1 , wherein the first internal rotor ( 75 ) of the first electric motor ( 71 ) is arranged on the first shroud ( 24 ).

9. Radial blood pump according to claim 1 , wherein the first and the second inlet channel ( 41 , 42 ) are arranged opposite to each other and wherein the blades ( 20 ) are configured such that the straight-line fluidic passage ( 105 ) is provided between the first inlet channel ( 41 ) and the second inlet channel ( 42 ) through the eyes ( 23 ) of the impeller ( 2 , 2 b ), such that a pressure difference between the first and the second blood flow ( 106 , 107 ) is reduced before the blood of the first and the second blood flow ( 106 , 107 ) is pumped to the first or second outlet channel ( 51 , 52 ).

10. Radial blood pump according to claim 1 , wherein the blood pump ( 1 ) comprises an active magnetic bearing ( 62 ), or wherein the blood pump ( 1 ) comprises a mechanic bearing ( 61 ).

11. Radial blood pump according to claim 1 , wherein the blood pump ( 1 ) comprises a second outlet channel ( 52 ) to which blood from the first and/or second inlet channel ( 41 , 42 ) can be pumped by the impeller ( 2 , 2 b ).

12. The radial blood pump according to claim 11 , wherein the second outlet channel ( 52 ) is arranged in a tangential direction with respect to the impeller ( 2 , 2 b ).

13. System with a blood pump ( 1 ) according to claim 1 and a device for electric power transfer, wherein the system further comprises a sensor ( 11 ) for estimating a hemodynamic signal ( 300 ) and a controller ( 300 ) that is configured to adjust a pump rate according to the determined hemodynamic signal ( 300 ).

14. System according to claim 13 , wherein the device for electric power transfer is configured to wirelessly transfer the electric power to the blood pump ( 1 ), wherein the electric power transfer device comprises a power receiver and a power transceiver, wherein the power receiver is electrically connected to the blood pump ( 1 ) and configured for providing the blood pump ( 1 ) with electric energy transferred from the power transceiver to the power receiver.

15. Method for adjusting a pump rate according to a hemodynamic signal ( 300 ) with a system according to claim 13 , comprising the steps of:
Determining at least one hemodynamic signal ( 300 ) of a patient having implanted the radial blood pump ( 1 );
Determining from the determined hemodynamic signal ( 300 ) a required pump output rate for the first outlet channel ( 51 );
Adjusting the radial blood pump ( 1 ) such that the determined pump output rate is achieved.

16. The radial blood pump according to claim 13 , wherein the sensor ( 11 ) is a pressure sensor.

Assignees

• Univ Zuerich

Inventors

• Granegger Marcus
• Hübler Michael
• Thamsen Bente
• Schweiger Martin

Classifications

• A61M60/35

  for specific surgeries, e.g. for Fontan procedure · CPC title

• A61M60/806

  Vanes or blades · CPC title

• A61M60/531

  using blood pressure data, e.g. from blood pressure sensors · CPC title

• A61M60/148

  in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices · CPC title

• A61M60/538

  Regulation using real-time blood pump operational parameter data, e.g. motor current · CPC title