Patent ID: 8504133

Claim:
A system for sensing multiple local electric voltages from endocardial surface of a heart, comprising: a first elongate tubular member having a lumen, a proximal end and a distal end; a basket assembly comprising: a plurality of flexible splines having proximal portions, distal portions and medial portions therein between, wherein the splines comprise an outer surface, an inner surface and two side surfaces, and wherein the splines further comprise alignment members projecting laterally outwardly from the two side surfaces at the distal portions of the splines; a proximal anchor for securably affixing the proximal portions of the splines, wherein the anchor is securably affixed within the lumen of the elongate tubular member at the distal end of the first elongate tubular member; a distal tip having a plurality of channels, each of the channels having a distal portion of one of the plurality of the splines disposed thereat, said tip further comprising a central spline alignment portion, wherein the alignment members of the splines are securably disposed within the spline alignment portion of the distal tip; wherein said proximal anchor and said distal tip defining a longitudinal axis therein between about which the splines are disposed; and a polymeric member comprising opposed first and second open ends defining an open lumen therein between and an inner member surface and an outer member surface, wherein at least one of the plurality of flexible splines is at least partially disposed within the lumen of said polymeric member; a flexible electrode assembly strip with one or more exposed electrodes disposed on at least a portion of the outer surface of said polymeric member; wherein the flexible electrode assembly strip comprises: a polymeric substrate having an inner surface and an opposed outer surface; said one or more exposed electrodes disposed over at least part of the outer surface of the polymeric substrate; and one or more electrical traces disposed over at least a portion of the inner surface of the polymeric substrate or over at least a portion of the outer surface of the polymeric substrate, said one or more electrical traces being in electrical communication with said one or more exposed electrodes; wherein the first opposed open end of the polymeric member is disposed at the distal spline portion of said at least one of the plurality of flexible splines at a position near to the distal tip and the second opposed open end of the polymeric member is secured to the proximal spline portion of said at least one of the plurality of flexible splines at a position near to the anchor; wherein medial portions of the polymeric member between said first opposed open end and said second opposed open end of the polymeric member are not secured to said medial portions of said at least one of the plurality of flexible splines wherein the basket assembly has a radially expanded non-cylindrical shape; and wherein the splines comprise a superelastic material.