Clot retrieval device for removing clot from a blood vessel
First Claim
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1. A clot retrieval device comprising:
- a shaft having a length extending between a shaft proximal end and a shaft distal end, andan expandable clot engaging element expandable between a collapsed state and an expanded state, wherein the shaft is separate from the expandable clot engaging element, the expandable clot engaging element comprising;
a first portion having a distal end, a closed proximal end fixedly coupled longitudinally and rotationally to the shaft distal end, and a tubular section between the distal end and the closed proximal end, the tubular section configured to form a flow channel through a clot and tapering out from the closed proximal end;
a second portion coupled to the distal end of the first portion, the second portion comprising an open distal end larger than an open proximal end and extending distally of the distal end of the first portion in the expanded state, anda distal net portion comprising a closed distal end and an open proximal end larger than distal end of the second portion, the open proximal end of the distal net portion coupled to the distal end of the second portion and distally extended therefrom, wherein the second portion includes a plurality of struts forming second portion cells and the distal net portion includes a plurality of struts forming a plurality of distal net cells smaller than the second portion cells;
the expandable clot engaging element having a length extending between the closed proximal end and the closed distal end, wherein the length of the shaft is longer than the length of the clot engaging element,wherein in the expanded state, the second portion has a radial size larger than a radial size of the tubular section of the first portion.
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Abstract
A clot retrieval device may include an elongate member and an expandable clot engaging element configured to extend across the clot in its expanded state. The expandable clot engaging element may include a first monolithic structure and a second monolithic structure. The first monolithic structure may encircle the second monolithic structure over at least a portion of its length. The second monolithic structure may include a proximal section, an intermediate section, and a distal section. The distal section may include an expansion.
542 Citations
19 Claims
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1. A clot retrieval device comprising:
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a shaft having a length extending between a shaft proximal end and a shaft distal end, and an expandable clot engaging element expandable between a collapsed state and an expanded state, wherein the shaft is separate from the expandable clot engaging element, the expandable clot engaging element comprising; a first portion having a distal end, a closed proximal end fixedly coupled longitudinally and rotationally to the shaft distal end, and a tubular section between the distal end and the closed proximal end, the tubular section configured to form a flow channel through a clot and tapering out from the closed proximal end; a second portion coupled to the distal end of the first portion, the second portion comprising an open distal end larger than an open proximal end and extending distally of the distal end of the first portion in the expanded state, and a distal net portion comprising a closed distal end and an open proximal end larger than distal end of the second portion, the open proximal end of the distal net portion coupled to the distal end of the second portion and distally extended therefrom, wherein the second portion includes a plurality of struts forming second portion cells and the distal net portion includes a plurality of struts forming a plurality of distal net cells smaller than the second portion cells; the expandable clot engaging element having a length extending between the closed proximal end and the closed distal end, wherein the length of the shaft is longer than the length of the clot engaging element, wherein in the expanded state, the second portion has a radial size larger than a radial size of the tubular section of the first portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A clot retrieval device comprising:
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a shaft having a length extending between a shaft proximal end and a shaft distal end; and a self-expandable clot engaging element separate from the shaft and expandable between a collapsed state and an expanded state, the expandable clot engaging element comprising; a first portion having a distal end and a proximal end coupled to and longitudinally fixed to the shaft distal end such that the clot engaging element extends distally of a distalmost end of the shaft distal end, the first portion configured to form a flow channel through a clot and comprising; a proximal taper section extending from the shaft; and a tubular section extending from the proximal taper section, a second portion coupled to the proximal end of the first portion, the second portion comprising an open distal end larger than an open proximal end and extending distally of the first portion in the expanded state, and a distal net portion comprises a closed distal end and a proximal end larger than distal end of the second portion, the proximal end of the distal net portion coupled to a distal end of the second portion and distally extended therefrom, wherein the second portion is positioned between the first portion and the distal net portion, wherein the second portion includes a plurality of struts forming second portion cells and the distal net portion includes a plurality of struts forming a plurality of distal net cells smaller than the second portion cells the self-expandable clot engaging element having a length extending between the proximal end of the first portion and the closed distal end of the distal net portion, wherein the length of the shaft is longer than the length of the clot engaging element, wherein in the expanded state, the tubular section of the first portion has a radial size between about 20% and about 60% of a radial size of the second portion. - View Dependent Claims (12, 13, 14, 15)
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16. A clot retrieval system comprising:
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a sheath, a shaft, wherein a portion of the shaft is received within a proximal portion of the sheath, and a self-expandable clot engaging element separate from the shaft and expandable between a collapsed state and an expanded state, the self-expandable clot engaging element extends distally of a distalmost end the shaft, the self-expandable expandable clot engaging element comprising; a first portion having a distal end, a proximal end fixed to a distal end of the shaft, and a tubular section disposed between the distal and proximal end, wherein in the expanded state the tubular section proximally tapers outward from the shaft, a second portion coupled to the distal end of the first portion, the second portion comprising an open distal end larger than an open proximal end and extending distally of the distal end of the first portion in the expanded state, and a distal net portion comprising a closed distal end and an open proximal end larger than the open distal end of the second portion, the open proximal end of the distal net portion coupled to the distal end of the second portion and distally extended therefrom, wherein the second portion includes a plurality of struts forming second portion cells and the distal net portion includes a plurality of struts forming a plurality of distal net cells smaller than the second portion cells; wherein in the expanded state, the second portion has a radial size larger than a radial size of the tubular section of the first portion, and wherein each of the first portion, the second portion, and the distal net portion comprise a plurality of struts, wherein the density of the struts provided by the distal net portion is greater than the density of the struts provided by the first portion and second portion. - View Dependent Claims (17, 18, 19)
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Specification