Apparatus and method for separation of scar tissue in venous pathway
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United States of America Patent
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-
Mar 18, 1986
Issued Date -
N/A
app pub date -
Sep 17, 1984
filing date -
Mar 30, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus and method is provided for separating scar tissue through a venous path to allow passage of an endocardial lead extracting apparatus into a patient's heart. A metal cannula having a smooth leading edge is manipulated in conjunction with a lead grasping device to slip the metal cannula over the lead to be removed, controlling advancement of the cannula with a cannula control catheter until the leading edge of the cannula is advanced a predetermined distance into the scar tissue. A metal shearing cylinder having a plurality of sharp teeth disposed on its leading end and controlled by a cylinder control catheter is advanced over the surface of the cannula, depressing a locking element thereof and to lock the cannula to the lead. Further advancement of the cylinder causes its teeth to separate a thin layer of the scar tissue. The cylinder is retracted to unlock the cannula, which is advanced. The shearing cylinder is advanced, relocking the cannula and separate a further portion of the scar tissue. The process is repeated until the cannula has advanced through the scar tissue.
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