Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical energy applicator
Patent
1994-02-02
1995-08-22
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical energy applicator
A61N 104
Patent
active
054434920
ABSTRACT:
An implantable lead for establishing electrical contact between a medical device and body tissue, in which an active fixation mechanism secures the lead in place while allowing a distal electrode on the lead to mechanically "float" with respect to the body tissue. In one embodiment, the active fixation mechanism comprises a curved hook disposed on the lead at a point spaced proximally back from the distal end of the lead. The curved hook defines a helix around at least a portion of the lead's circumference. A hollow introducer needle is slidably disposed on the lead. The hollow needle provided with a longitudinal slit in a distal section of is length, such that the distal section of the needle can be advanced over the distal end of the lead, past the fixation hook, which is received in the longitudinal slit. With the needle slid over the distal end of the lead, the needle is stabbed tangentially into an implant site, bringing the fixation hook proximal to the surface of the body tissue. Then, the needle is twisted (bringing about a twisting of the lead), causing the curved fixation hook to pierce and engage the body tissue, securing the lead in place. Then the needle is withdrawn from the body tissue and removed from the lead. In an alternative embodiment, the lead can be placed by an endocardial approach using a flexible cannula with a longitudinally slotted tip.
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McVenes Rick D.
Proctor Keith J.
Stokes Kenneth B.
Jaro Michael J.
Kamm William E.
Medtronic Inc.
Patton Harold R.
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