Method and apparatus for cardiac blood flow assistance
First Claim
Patent Images
1. An intravascular microaxial flow pump, comprising:
- a cylindrical drive unit of preselected outer diameter having an electric motor disposed therein driving a shaft distally extending therefrom wherein such shaft is supported solely by two bearings, one located at the extreme proximal end of said drive unit and another at the extreme distal end of said drive unit;
a cylindrical intravascular microaxial flow pump housing rigidly attached to said drive unit having essentially the same preselected outer diameter and oriented to be coaxially and distally disposed with respect to said drive unit; and
an impeller disposed within said pump housing, rigidly affixed to said shaft, and located immediately adjacent said distal bearing, operative to draw fluid into and through said housing and over said drive unit.
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Abstract
An intravascular microaxial pump has an integrated configuration that enables both the drive unit as well as the pumping segment to be advanced through a patient'"'"'s vasculature. The device includes elements that enhance pumping efficiency and performance while minimizing shear and cavitation. Cost reduction is achieved in the reusability of certain components while a manufacturing method reduces the labor involved in the pump'"'"'s assembly.
344 Citations
49 Claims
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1. An intravascular microaxial flow pump, comprising:
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a cylindrical drive unit of preselected outer diameter having an electric motor disposed therein driving a shaft distally extending therefrom wherein such shaft is supported solely by two bearings, one located at the extreme proximal end of said drive unit and another at the extreme distal end of said drive unit; a cylindrical intravascular microaxial flow pump housing rigidly attached to said drive unit having essentially the same preselected outer diameter and oriented to be coaxially and distally disposed with respect to said drive unit; and an impeller disposed within said pump housing, rigidly affixed to said shaft, and located immediately adjacent said distal bearing, operative to draw fluid into and through said housing and over said drive unit. - 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)
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24. An intravascular microaxial flow pump, comprising:
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a cylindrical drive unit of preselected outer diameter having an electric motor disposed therein driving a shaft distally extending therefrom wherein void space within said drive unit is separated from its exterior by a seal, fitted about said shaft; a cylindrical pump housing rigidly attached to said drive unit having essentially the same preselected outer diameter and oriented to be coaxially and distally disposed with respect to said drive unit; an impeller disposed within said pump housing, rigidly affixed to said shaft; a biocompatible charge fluid contained within said void space and charged to a pressure that exceeds the pressure of fluid to be pumped by said fluid pump; and
, a flexible diaphragm disposed on an exterior surface of said drive unit and in fluid communication with said void space, configured such that a positive internal pressure of said fluid imparts a domed appearance to said diaphragm to provide a visual indication as to the state of charge. - View Dependent Claims (25, 26)
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27. An intravascular microaxial flow pump, comprising:
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a cylindrical drive unit of preselected outer diameter having an electric motor disposed therein driving a shaft distally extending therefrom wherein such shaft is supported solely by two bearings, one located at the extreme proximal end of said drive unit and another at the extreme distal end of said drive unit; a cylindrical intravascular microaxial flow pump housing rigidly attached to said drive unit having essentially the same preselected outer diameter and oriented to be coaxially and distally disposed with respect to said drive unit; and an impeller disposed within said pump housing, rigidly affixed to said shaft, and located immediately adjacent said distal bearing, operative to draw fluid over said drive unit and through said housing. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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Specification