| abstract |
A multi-lumen lead body having a smooth transition between regions of varying stiffness on the lead body is described. In one example, the different regions of the lead body can be formed by altering a mix ratio of the different polymers used to form the lead body during the extrusion process. In another example, two or more layers of polymeric materials are co-extruded, and the cross-sectional thicknesses of each of the layers varied in the different regions of the lead body to achieve different stiffnesses. In yet another example, the internal geometry of the lead body is altered during the extrusion process to alter the physical properties of the lead body in a select region of the lead body. In still yet another example, a transition member is provided between regions of varying stiffness to facilitate a smooth transition between the different regions. |