Catheters and catheter systems using FBG fiber optics to sense shape and contact force

Abstract

According to the present invention, by performing a ternary operation on the three wavelength information based on the transition of the fiber Bragg grating (FBG) respectively arranged in the three optical cores, the bending position, direction, angle and curvature of the main body of the catheter can be detected, thereby sensing The shape of the catheter.

Description

technical field [0001] The invention relates to a catheter and a catheter system that utilizes fiber optic Bragg grating (FBG) optical fiber to sense shape and contact force, and can use light wavelength information to calculate the induction of the deformed shape of the catheter body and the contact force and direction applied to the front end of the catheter. in cardiovascular interventional surgery. Background technique [0002] In general, a catheter is a medical device used to insert a catheter into a patient's body and perform radiofrequency treatment on an affected area, or to inject medical substances into the body and to drain body fluids from the body. [0003] During the treatment with the catheter as described above, when the pointed end of the catheter exerts excessive pressure on the affected part of the patient, the affected part may be damaged. On the contrary, when the pressure of the tip of the catheter in contact with the affected part is too small, the a...

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Problems solved by technology

[0015] However, the impedance-based cardiac mapping method pointed out in this non-patent literature has the following disadvantages: the accuracy of the three-dimensional image will be reduced due to electric field deformation caused by technical problems

[0017] Although there are cost advantages in utilizing the magnetic field-sensing position compared to catheter systems for fluoroscopy, this non-patent literature has the following problems: its system for obtaining accurate maps in real time is not optimized, and, when the catheter is bent , the phenomenon could not be detected in time, so until now it has been used in conjunction with traditional mapping catheters

[0018] As a result, since the electroanatomical mapping technology performs three-dimensional mapping based on the transthoracic electric field, in the actual operation process, the reference point (reference source) shaking or the electric field change may be caused by the movement of the heart and the patient's breathing, which will reduce the Anatomical precision, and the limitation of the mapping catheter is that it can only map sequentially based on contact, not simultaneously on multiple electrodes, thus, cannot be activated in unstable cardiac arrhythmias such as atrial fibrillation (Activation) Mapping

In addition, it is difficult to obtain real-time deformation information such as catheter bending by using magnetic field mapping technology, and system optimization is still a challenge

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