A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
A61B 17/22 (2006.01) A61M 25/00 (2006.01) A61B 17/32 (2006.01)
Patent
CA 2128567
A thrombectomy system for dissolving a soft fibrinous obstruction, such as a recently formed thrombus, within a patient's vascular system, either in a patent vein or artery or in a prosthetic implant, employing a soft rotating brush for separating and mixing the fibrin of the thrombus while a dissolving agent, e.g. streptokinase or urokinase, is introduced and mixed in and applied to the separated fibrin. The system includes an introducer catheter adapted to be introduced and advanced through a patient's blood vessels until the distal end is positioned adjacent the soft fibrinous thrombus, the brush attached to an elongated, flexible, rotatable drive shaft having a drive motor attached at its proximal end, the drive shaft and brush passed through the introducer lumen to place the brush in contact with the soft thrombus. The brush has soft, flexible bristles extending outward from the drive shaft distal end, the bristles being sufficiently resilient and dimensioned for enabling compression and passage of the brush out of and back into the distal end of the introducer lumen and effective to mix into then fibrin of the soft thrombus, yet not damage the vessel wall. The dissolving agent is introduced during rotation of the brush either through the introducer catheter lumen or a drive shaft lumen and out exit ports at the distal ends thereof in the region of rotation of the brush for dissolving the soft thrombus as it is contacted by the bristles. Optionally, a balloon catheter or a mesh basket may be coaxially introduced through the drive shaft lumen and placed downstream to restrain fragments and to allow the dissolving agent to complete the dissolution thereof.
Cragg Andrew H.
Micro Therapeutics Inc.
Smart & Biggar
LandOfFree
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