Electrosurigcal device and methods
Inventors
Godara, Neil • Harrison, Robert • Dastjerdi, Ahmad • Escoto, Abelardo • Peng, Aaron • Oldham, Andrew • Huynh, Jimmy • LI, Ryan
Assignees
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Publication Number
US-12758306-B2
Publication Date
2026-10-13
Expiration Date
Abstract
A method and apparatus are disclosed for a probe for forming a lesion in a target tissue. The probe comprises an elongate member with a distal tip and a proximal end. The elongate member defines a lumen therebetween which circulates cooling fluid. The probe further includes at least one active portion configured to deliver energy to the target tissue and at least one orifice. A portion of the cooling fluid is ejected from the at least one orifice to cool the target tissue and the remainder is internally circulated through the lumen of the probe.
Core Innovation
The method delivers energy to a region of tissue within a patient's body while circulating fluid through a lumen of an energy delivery device and ejecting a portion of the fluid from at least one orifice. The system determines the radiofrequency power profile of the energy delivery device, compares that profile with a predetermined radiofrequency power profile, and controls the circulating-fluid flow rate based on the comparison.
The system includes an internally cooled, partially irrigated radiofrequency treatment probe featuring fluid-circulation lumens and orifices to hydrate and cool tissue while recirculating the remainder. The flow-control scheme involves a power ramp and plateau, adjusting flow during ablation by increasing flow when measured power is below target and decreasing flow when above target, governed by relationships between irrigation rate, current-squared, power ramp, lesion volume, temperature, and impedance behavior.
Claims Coverage
The claims identify three inventive features within one independent claim, focused on energy delivery, profile comparison, and flow-rate control.
Energy delivery with circulating fluid
The method delivers energy to a region of tissue through an energy delivery device while circulating fluid through a lumen, with a portion of the fluid ejected from at least one orifice.
Radiofrequency power profile comparison
The method determines a radiofrequency power profile of the energy delivery device and compares it to a predetermined radiofrequency power profile, wherein the profile may include a radiofrequency power ramp profile and a plateau radiofrequency value.
Profile-based flow-rate control
The method controls the circulating-fluid flow rate based on the comparison, increasing flow when the determined profile is lower than the predetermined profile and decreasing flow when above target, using repeated or substantially continuous comparison and adjustment.
The claim coverage encompasses energy delivery and fluid circulation combined with radiofrequency power profile determination, comparison against a predetermined profile, and profile-based adjustment of circulating-fluid flow rate.
Stated Advantages
Increased irrigation can increase radiofrequency output and lesion volume.
The fluid ejected by the partially irrigated probe hydrates and cools tissue.
Documented Applications
Radiofrequency ablation and delivery of energy to a region of tissue within a patient's body using a medical treatment system that delivers energy while circulating and partially ejecting fluid.
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