Cannula assembly
First Claim
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1. A cannula assembly for an intravascular heart pump system comprising:
- a catheter;
a cannula in communication with a distal end of the catheter; and
a pigtail extension in communication with a distal end of the cannula, the pigtail extension configured to position the cannula within the heart, the pigtail extension comprising;
a proximal section comprising a single layer of a first material at a first thickness, anda distal section comprising a first layer of the first material at a second thickness, and a second layer of a second material at a third thickness, the second and third thicknesses in aggregate corresponding to the first thickness,wherein the distal section has an overall lower stiffness than the proximal section, andwherein the proximal section is positioned between the distal end of the cannula and at least a portion of the distal section.
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Abstract
Cannula assemblies and methods of manufacturing cannula assemblies are provided. The cannula assembly includes a cannula and a pigtail extension coupled to the cannula. The pigtail extension includes a proximal section having a first stiffness and a distal section having a second stiffness, the first stiffness greater than the second stiffness. The proximal section of the pigtail extension is positioned between the cannula and at least a portion of the distal section.
19 Citations
21 Claims
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1. A cannula assembly for an intravascular heart pump system comprising:
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a catheter; a cannula in communication with a distal end of the catheter; and a pigtail extension in communication with a distal end of the cannula, the pigtail extension configured to position the cannula within the heart, the pigtail extension comprising; a proximal section comprising a single layer of a first material at a first thickness, and a distal section comprising a first layer of the first material at a second thickness, and a second layer of a second material at a third thickness, the second and third thicknesses in aggregate corresponding to the first thickness, wherein the distal section has an overall lower stiffness than the proximal section, and wherein the proximal section is positioned between the distal end of the cannula and at least a portion of the distal section. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A cannula assembly for an intravascular heart pump system comprising:
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a cannula; and a pigtail extension in communication with the cannula, the pigtail extension comprising; a proximal section comprising a single layer of a first material at a first thickness, and a distal section comprising a first layer of the first material at a second thickness, and a second layer of a second material at a third thickness, the second and third thicknesses in aggregate corresponding to the first thickness, wherein the distal section has an overall lower stiffness than the proximal section, wherein the proximal section is positioned between the cannula and at least a portion of the distal section, and wherein the proximal section is dimensioned to have a buckling load greater than a thrust force generated by the heart pump assembly.
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21. A cannula assembly for an intravascular heart pump system comprising:
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a cannula; and a pigtail extension in communication with the cannula, the pigtail extension comprising; a proximal section comprising a single layer of a first material at a first thickness, and a distal section comprising a first layer of the first material at a second thickness, and a second layer of a second material at a third thickness, the second and third thicknesses in aggregate corresponding to the first thickness, wherein the distal section has an overall lower stiffness than the proximal section, wherein the proximal section is positioned between the cannula and at least a portion of the distal section; and wherein the distal section is dimensioned to have a buckling load less than a thrust force generated by the blood pump assembly.
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Specification