+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on LinkedInFollow on LinkedIn

+ Translate

Modeling and estimation of tip contact force for steerable ablation catheters

Modeling and estimation of tip contact force for steerable ablation catheters

IEEE Transactions on Bio-Medical Engineering 62(5): 1404-1415

The efficacy of catheter-based cardiac ablation procedures can be significantly improved if real-time information is available concerning contact forces between the catheter tip and cardiac tissue. However, the widely used ablation catheters are not equipped for force sensing. This paper proposes a technique for estimating the contact forces without direct force measurements by studying the changes in the shape of the deflectable distal section of a conventional 7-Fr catheter (henceforth called the "deflectable distal shaft," the "deflectable shaft," or the "shaft" of the catheter) in different loading situations. First, the shaft curvature when the tip is moving in free space is studied and based on that, a kinematic model for the deflectable shaft in free space is proposed. In the next step, the shaft shape is analyzed in the case where the tip is in contact with the environment, and it is shown that the curvature of the deflectable shaft provides useful information about the loading status of the catheter and can be used to define an index for determining the range of contact forces exerted by the ablation tip. Experiments with two different steerable ablation catheters show that the defined index can detect the range of applied contact forces correctly in more than 80% of the cases. Based on the proposed technique, a framework for obtaining contact force information by using the shaft curvature at a limited number of points along the deflectable shaft is constructed. The proposed kinematic model and the force estimation technique can be implemented together to describe the catheter's behavior before contact, detect tip/tissue contact, and determine the range of contact forces. This study proves that the flexibility of the catheter's distal shaft provides a means of estimating the force exerted on tissue by the ablation tip.

(PDF emailed within 0-6 h: $19.90)

Accession: 058328404

Download citation: RISBibTeXText

PMID: 25585409

DOI: 10.1109/TBME.2015.2389615

Related references

Steerable versus non-steerable sheaths during pulmonary vein isolation: impact of left atrial enlargement on the catheter-tissue contact force. Journal of Interventional Cardiac Electrophysiology 47(1): 99-107, 2016

Contact force-sensing catheters: evolution or revolution in catheter ablation technology?. Circulation. Arrhythmia and Electrophysiology 7(1): 5-6, 2014

Development of an integrated optical contact force monitoring sensor for cardiac ablation catheters. Conference Proceedings 2015: 4363-4366, 2016

Initial impedance decrease as an indicator of good catheter contact: insights from radiofrequency ablation with force sensing catheters. Heart Rhythm 11(2): 194-201, 2014

Dynamics of the phospholipid shell of microbubbles: a fluorescence photoselection and spectral phasor approach. Chemical Communications, 2018

Does EGFR Mutation Type Influence Patient-Reported Outcomes in Patients with Advanced EGFR Mutation-Positive Non-Small-Cell Lung Cancer? Analysis of Two Large, Phase III Studies Comparing Afatinib with Chemotherapy (LUX-Lung 3 and LUX-Lung 6). Patient, 2017

The evaluation of steerable ultrasonic catheters for minimally invasive MRI-guided cardiac ablation. Magnetic Resonance in Medicine 72(2): 591-598, 2015

Contact-force-guided vs. contact-force-blinded catheter ablation of typical atrial flutter: a prospective study. Europace, 2016

Randomized, Controlled Trial of the Safety and Effectiveness of a Contact Force-Sensing Irrigated Catheter for Ablation of Paroxysmal Atrial Fibrillation: Results of the TactiCath Contact Force Ablation Catheter Study for Atrial Fibrillation (TOCCASTAR) Study. Circulation 132(10): 907-915, 2015

The relationship between impedance change and catheter contact force during radiofrequency ablation: Evaluation in a porcine Ex Vivo cardiac model using a novel force-sensing irrigated tip ablation catheter. 2007

A randomized trial to compare atrial fibrillation ablation using a steerable vs. a non-steerable sheath. Europace 11(5): 571-575, 2009

Impact of steerable sheaths on contact forces and reconnection sites in ablation for persistent atrial fibrillation. Journal of Cardiovascular Electrophysiology 26(3): 266-273, 2015

Prospective randomized comparison of a steerable versus a non-steerable sheath for typical atrial flutter ablation. Europace 12(3): 402-409, 2010

Contact force and impedance decrease during ablation depends on catheter location and orientation: insights from pulmonary vein isolation using a contact force-sensing catheter. Journal of Interventional Cardiac Electrophysiology 43(3): 297-306, 2016

Operator-blinded contact force monitoring during pulmonary vein isolation using conventional and steerable sheaths. International Journal of Cardiology 177(3): 970-976, 2015