Fluid pump with a rotor
First Claim
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1. A percutaneous pump, comprising:
- an expandable and compressible housing having a first inner diameter when compressed and a second inner diameter when expanded;
a rotor disposed within the housing, the rotor having a compressed state, a first expanded state, and a second expanded state;
the rotor comprising;
a hub; and
a helical rotor blade coupled to the hub and configured to convey fluid, wherein the helical rotor blade spans at least 180 degrees about the hub;
wherein the helical rotor blade is configured to increase in diameter between the compressed state and the first expanded state to a first expanded diameter in the first expanded state, and to further increase between the first expanded diameter in the first expanded state to a second expanded diameter in the second expanded state, said increase to the second expanded diameter due at least in part to fluid counterpressure on the helical rotor blade;
wherein the helical rotor blade is configured to increase in diameter from the compressed state to the first expanded state due at least in part to expansion of the housing from the first inner diameter to the second inner diameter; and
wherein the rotor is configured to expand from the compressed state to the first expanded state and to the second expanded state within the expanded housing, and wherein a first difference between the second inner diameter of the housing and the first expanded diameter of the helical rotor blade is greater than a second difference between the second inner diameter of the housing and the second expanded diameter of the helical rotor blade.
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Abstract
The invention relates to a fluid pump, in particular to a liquid pump having a rotor with at last one rotor blade for conveying the fluid, the rotor being variable with respect to its diameter between a first, compressed state and a second expanded state. In order to produce a simple compressibility and expandability of the rotor of the pump, it is provided according to the invention that at least one rotor blade is deformable between a first state which it assumes in the compressed state of the rotor and a second state which it assumes in the expanded state of the rotor by means of a fluid counterpressure during a rotation of the rotor during pump operation.
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Citations
24 Claims
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1. A percutaneous pump, comprising:
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an expandable and compressible housing having a first inner diameter when compressed and a second inner diameter when expanded; a rotor disposed within the housing, the rotor having a compressed state, a first expanded state, and a second expanded state;
the rotor comprising;a hub; and a helical rotor blade coupled to the hub and configured to convey fluid, wherein the helical rotor blade spans at least 180 degrees about the hub; wherein the helical rotor blade is configured to increase in diameter between the compressed state and the first expanded state to a first expanded diameter in the first expanded state, and to further increase between the first expanded diameter in the first expanded state to a second expanded diameter in the second expanded state, said increase to the second expanded diameter due at least in part to fluid counterpressure on the helical rotor blade; wherein the helical rotor blade is configured to increase in diameter from the compressed state to the first expanded state due at least in part to expansion of the housing from the first inner diameter to the second inner diameter; and wherein the rotor is configured to expand from the compressed state to the first expanded state and to the second expanded state within the expanded housing, and wherein a first difference between the second inner diameter of the housing and the first expanded diameter of the helical rotor blade is greater than a second difference between the second inner diameter of the housing and the second expanded diameter of the helical rotor blade. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification