Spiral sensor for physiologic signal measurement with position and tissue proximity indication

A catheter comprising:

• a tubular member extending along a longitudinal axis;
• and
• three multi-functional sensors disposed equiangularly about the longitudinal axis so that a respective central axis of each multi-functional sensor of the three multi-functional sensors is disposed orthogonal to the longitudinal axis, each multi-functional sensor of the three multi-functional sensor comprising:
• a first substrate disposed on an outer surface of the tubular member;
• a first coil disposed on the first substrate and comprising conductive surfaces;
• a second substrate disposed on an inner surface of the tubular member;
• and
• a second coil disposed on the second substrate and comprising conductive surfaces,
• the first coil being configured to have its conductive surfaces exposed to an external environment, and
• the second coil being configured to have its conductive surfaces insulated from the external environment.

A catheter comprising:

• a tubular member extending along a longitudinal axis;
• and
• three multi-functional sensors disposed equiangularly about the longitudinal axis so that a respective central axis of each multi-functional sensor of the three multi-functional sensors is disposed orthogonal to the longitudinal axis, each multi-functional sensor of the three multi-functional sensor comprising:
• a substrate;
• a first coil disposed on an outer surface the substrate and comprising conductive surfaces;
• and
• a second coil disposed on an inner surface of the substrate and comprising conductive surfaces,
• the substrate being affixed to the tubular member such that the first coil is configured to have its conductive surfaces exposed to an external environment and such that the second coil is configured to have its conductive surfaces insulated from the external environment.