Key result
A novel 9 Fr MRI-compatible fiber-optic force sensor successfully measured catheter-tip contact forces in the range of 0-0.85 N during real-time MRI in vivo experiments.
A novel 9 Fr MRI-compatible fiber-optic force sensor demonstrates feasibility for real-time measurement of catheter-tip contact forces during cardiac catheterization.
Feasibility shown in animals supports sensor development; leaves open human safety and efficacy validation.
This paper presents a novel, magnetic resonance imaging (MRI)-compatible, force sensor suitable for cardiac catheterization procedures. The miniature, fiber-optic sensor is integrated with the tip of a catheter to allow the detection of interaction forces with the cardiac walls. The optical fiber light intensity is modulated when a force acting at the catheter tip deforms an elastic element, which, in turn, varies the distance between a reflector and the optical fiber. The tip sensor has an external diameter of 9 Fr (3 mm) and can be used during cardiac catheterization procedures. The sensor is able to measure forces in the range of 0-0.85 N, with relatively small hysteresis. A nonlinear method for calibration is used and real-time MRI in vivo experiments are carried out, to prove the feasibility of this low-cost sensor, enabling the detection of catheter-tip contact forces under dynamic conditions.
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Polygerinos et al. (2010) studied Cardiac catheterization. MRI-compatible intensity-modulated force sensor was evaluated on Measurement of catheter-tip contact forces. A novel 9 Fr MRI-compatible fiber-optic force sensor successfully measured catheter-tip contact forces in the range of 0-0.85 N during real-time MRI in vivo experiments.
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