Expansible shearing catheters for thrombus removal
First Claim
1. A thrombectomy catheter comprising:
- a flexible tubular body having a proximal end and a distal end;
an outer shearing member attached near the distal end, the outer member having a perforate inner surface; and
an inner shearing member rotatably disposed within the outer member, the inner member having a proximal portion, a distal portion, and a circumferential series of struts extending therebetween, the struts sliding along the inner surface of the outer shearing member for shearing of clot material when the inner shearing member rotates, wherein the struts are helically oriented and have a local pitch that increases toward the proximal and distal portions sufficiently to inhibit excessive separation between adjacent struts when the outer shearing member flexes axially, and wherein the struts have protrusions which inhibit sliding of clot material axially between cooperating edges of the inner and outer shearing members.
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0 Petitions
Accused Products
Abstract
Devices, methods, kits, and methods remove clot material from the vasculature and other body lumens. Expansible baskets may be used as cooperating radially expansible shearing members. Helically oriented struts of each basket may wind in a uniform circumferential direction. The struts can be independently flexible, allowing the shearing members to flex axially together. The inner basket may be rotatably driven and may use an axial pump extending proximally from the shearing members and/or a distal penetrator for advancing into an occlusion which inhibits guidewire access. The struts may slide substantially continuously across each other, and may be sufficiently aggressive for highly effective thrombectomy.
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Citations
18 Claims
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1. A thrombectomy catheter comprising:
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a flexible tubular body having a proximal end and a distal end;
an outer shearing member attached near the distal end, the outer member having a perforate inner surface; and
an inner shearing member rotatably disposed within the outer member, the inner member having a proximal portion, a distal portion, and a circumferential series of struts extending therebetween, the struts sliding along the inner surface of the outer shearing member for shearing of clot material when the inner shearing member rotates, wherein the struts are helically oriented and have a local pitch that increases toward the proximal and distal portions sufficiently to inhibit excessive separation between adjacent struts when the outer shearing member flexes axially, and wherein the struts have protrusions which inhibit sliding of clot material axially between cooperating edges of the inner and outer shearing members. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A thrombectomy catheter comprising:
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a flexible tubular body having a proximal end and a distal end;
a flexible drive shaft rotatably disposed within the tubular body;
an outer shearing member attached near the distal end of the tubular body, the outer member having a circumferential series of independent outer struts, the outer struts having inner surfaces; and
an inner shearing member rotationally driven by the drive shaft within the outer member, the inner member having a proximal portion, a distal portion, and a circumferential series of independent inner struts, the inner struts having outer surfaces which slide across the inner surfaces of the outer struts so as to shear clot material when the inner shearing member rotates, at least one member of the group comprising the inner struts and the outer struts being helically oriented and having a local pitch that increases toward the proximal and distal portions sufficiently to inhibit excessive separation between adjacent struts when the outer shearing member flexes axially, wherein at least one member of the group comprising the inner struts and the outer struts have protrusions which inhibit sliding of clot material axially between cooperating edges of the inner and outer shearing members. - View Dependent Claims (15, 16, 17, 18)
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Specification