Patent ID: 11883106
Assignee: ST. JUDE MEDICAL, CARDIOLOGY DIVISION, INC.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 11:
12. A system comprising:
a medical catheter including a force sensor and an electrode; and
an electronic control unit (ECU) electrically and/or communicatively coupled to the force sensor and the electrode, the ECU configured and arranged to
measure electrical parameters at an interface between the electrode and target tissue of a patent,
measure contact force between the electrode and the target tissue via the force sensor,
measure energy applied from the electrode to the target tissue during an ablation therapy;
determine lesion size index according to an equation

LSI(F,I,t)=k1(f2(1−eF/f1)+f0)*i2(1−e−(I/i1)2)*((1−k0)+k01−e−t/τ/1−e−T/τ),, wherein F is force in grams, I is current in milliamps, t is a time in seconds, f0, f1, and f2 are force parameter coefficients, i1 and i2 are electrical current coefficients, k0 is a diffusive heating coefficient, k1 is a rescaling coefficient, τ is a characteristic time value, and the output LSI is in millimeters,
determine electrical coupling index,
based upon at least one of the determined lesion size index, electrical coupling index and measured energy, characterize the tissue,
based upon at least one of the determined lesion size index, electrical coupling index and measured energy, predict lesion size and depth of the ablation therapy, and
output the tissue characterization and lesion size and depth to a clinician.