Catheter with capacitive force sensor

An electrophysiology catheter adapted for use in an ostium, comprising:

• a balloon having a membrane, the balloon having a distal end and a proximal end defining a longitudinal axis;
• a flex circuit electrode assembly affixed to the membrane, the assembly having a plurality of leaves;
• a plurality of capacitive force sensors, each situated on a respective leaf and each having a first plate, a second plate configured for contact with the ostium, and an elastically compressible dielectric between the first and second plates, the dielectric separate from the membrane, wherein the force sensor has a first capacitance when the first and second plates are separated by a first distance, and the force sensor has a second capacitance when the first and second plates are separated by a second distance different from the first distance;
• a plurality of first terminals, each connected to a respective first plate;
• and
• a plurality of second terminals, each connected to a respective second plate,
• wherein the dielectric includes a wave spring.