Medical implantable lead and a method for attaching the same

摘要

A medical implantable lead of the type being adapted to be implanted into a human or animal body and attached with a distal end to an organ inside the body, has a helix of a helical wire in the distal end which is adapted to be screwed into the organ. In addition to the first helix, the lead also has a second helix of a helical wire, the second helix having the same diameter, the same pitch and being intertwined with the helical wire of the first helix and which, upon rotation of the first helix, will be rotated and screwed into the tissue. The first helix is electrically non-conductive whereas the second helix is electrically conductive. In a method for attaching a medical implantable lead to an organ inside a human or animal body, such a medical lead is employed and fixed to tissue in vivo.

主权项

1. A medical implantable lead comprising:
a lead body configured for in vivo implantation in a living subject, said lead body having a proximal end and an opposite, distal end, said lead body comprising an electrical conductor therein proceeding from said proximal end to said distal end; a rotatable shaft proceeding through said proximal end of said lead body to said distal end of said lead body; a first fixation helix formed by a first helical wire located at said distal end of said lead body, said first helical wire having a proximal end directly attached to a distal end of said rotatable shaft such that said first fixation helix being rotationally mounted at said distal end and comprising helical flights configured to screw said first fixation helix into an organ of the living subject upon rotation of said first fixation helix to fix and hold said first fixation helix in said organ; and a second fixation helix formed by a second helical wire also located at said distal end of said lead body, said second helical wire having a proximal end directly attached to said distal end of said rotatable shaft such that said second fixation helix comprising helical flights having a same pitch as said helical flights of said first fixation helix and being mounted at said distal end intertwined with said first fixation helix to cause co-rotation of said second fixation helix with said first fixation helix to screw said second fixation helix into said organ to fix and hold said second fixation helix in said organ; said first helical wire and said second helical wire arranged without any distance between them such that said first helical wire and said second helical wire act in combination as a single helical wire; and said first helical wire forming said first fixation helix being electrically non-conductive and said second helical wire forming said second fixation helix being electrically conductive and forming an electrically conductive path with said electrical conductor in said lead body to deliver electrical energy to said organ via said second helical wire serving as an electrode that electrically interacts with said organ, and said first and second fixation helices holding said electrode in place at said organ during delivery of said electrical energy.