Apparatus and method for separation of scar tissue in venous pat

Details Apparatus and method for separation of scar tissue in venous pat Apparatus and method for separation of scar tissue in venous pat

1984-09-17

1986-03-18

Kamm, William E.

Surgery

Truss

Pad

128419P, 128785, 294100, A61B 1750

Patent

active

045761620

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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patent: 4243040 (1981-01-01), Beecher
patent: 4253697 (1981-03-01), Acosta
patent: 4471771 (1984-09-01), McCorkle

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