Medical lead with performed bias
A medical electrical lead and methods of implanting medical electrical leads in lumens. Leads in accordance with the invention employ preformed biases to stabilize the lead within a lumen and to orient electrodes in a preferred orientation.
1. An implantable medical electrical lead comprising:
a. a lead body having a preformed helical bias with a coil diameter; and
b. at least one electrode disposed on a distal portion of the lead body and having a length parallel to the lead body portion on which it is disposed;
c. wherein a ratio of the coil diameter to the length of the at least one electrode is greater than or equal to 4:1.
2. The medical electrical lead of claim 1 , wherein the ratio of the coil diameter to the length of the electrode is greater than or equal to 5:1.
3. The medical electrical lead of claim 1 , wherein the ratio of the coil diameter to the length of the electrode is greater than or equal to 6:1.
4. The medical electrical lead of claim 1 , wherein the preformed helical bias is a converging helical bias and the coil diameter is defined as the diameter of the smallest coil of the bias.
5. The medical electrical lead of claim 4 , wherein the ratio of the coil diameter to the length of the electrode is greater than or equal to 5:1.
6. The medical electrical lead of claim 4 , wherein the ratio of the coil diameter to the length of the electrode is greater than or equal to 6:1.
7. The medical electrical lead of claim 1 , wherein the preformed helical bias is a diverging helical bias and the coil diameter is defined as the diameter of the smallest coil of the bias.
8. The medical electrical lead of claim 7 , wherein the ratio of the coil diameter to the length of the electrode is greater than or equal to 5:1.
9. A method of implanting a medical electrical lead in a lumen, the method comprising:
a. inserting a lead body in a lumen, the lead body having a preformed helical bias with a coil diameter and a plurality of electrodes disposed on a distal portion of the lead body, at least one of the plurality of electrodes having a length parallel to the lead body portion on which it is disposed, wherein a ratio of the coil diameter to the length of the at least one of the plurality of electrodes is greater than or equal to 4:1, wherein at least a portion of each of the plurality of electrodes is within a single quadrant of the helical bias
b. positioning the lead within the lumen so that a tissue of interest is within the quadrant as the quadrant extends outward radially.
10. The method of claim 9 , wherein the lumen comprises the right brachiocephalic vein and the tissue of interest comprises the right phrenic nerve.
11. The method of claim 9 , wherein the lumen comprises the left brachiocephalic vein and the tissue of interest comprises the left phrenic nerve.
12. The method of claim 9 , wherein the lumen comprises the superior vena cava and the tissue of interest comprises the right phrenic nerve.
13. The method of claim 9 , wherein the lumen comprises the right internal jugular vein and the tissue of interest comprises the hypoglossal nerve.
14. The method of claim 9 , wherein the lumen comprises the junction between the right brachiocephalic vein and the right subclavian vein.