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5 September 2018 3D printed micro-scale fiber optic probe for intravascular pressure sensing
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Small form-factor invasive pressure sensors are widely used in minimally invasive surgery, for example to guide decision making in coronary stenting procedures. Current fiber-optic sensors can have high manufacturing complexities and costs, which severely constrains their adoption outside of niche fields. A particular challenge is the ability to rapidly prototype and iterate upon sensor designs to optimize performance for different applications and medical devices. Here, we present a new sensor fabrication method, which involves two-photon polymerization printing and integration of the printed structure onto the end-face of a single-mode optical fiber. The active elements of the sensor were a pressure-sensitive diaphragm and an intermediate temperature-sensitive spacer that was insensitive to changes in external pressure. Deflection of the diaphragm and thermal expansion the spacer relative to the fiber end-face were monitored using phase-resolved low coherence interferometry. A pressure sensitivity of 0.031 rad/mmHg across the range of 760 to 1060 mmHg (absolute pressure), and a temperature sensitivity of 1.2 mrad/°C across the range 20 to 45°C were observed. This method will enable the fabrication of a wide range of fiber-optic sensors with pressure and temperature sensitivities suitable for guiding minimally invasive surgery.
Conference Presentation
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Radhika K. Poduval, Jo Coote, Charles A. Mosse, Malcolm C. Finlay, Ioannis Papakonstantinou, and Adrien E. Desjardins "3D printed micro-scale fiber optic probe for intravascular pressure sensing", Proc. SPIE 10728, Biosensing and Nanomedicine XI, 107280B (5 September 2018);

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