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Expansible shearing catheters for thrombus removal

  • US 6,652,548 B2
  • Filed: 03/30/2001
  • Issued: 11/25/2003
  • Est. Priority Date: 03/31/2000
  • Status: Expired due to Term
First Claim
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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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