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Ho HH, Nguyen AT, Chen YC, Chen LY, Dang HP, Tsai MJ, Cheng H, Horng SF, Huang CS, Zan HW, Meng HF. A Cylindrical Ion Sensor Tip with a Diameter of 1.5 mm for Potentially Invasive Medical Application. ACS OMEGA 2020; 5:23021-23027. [PMID: 32954152 PMCID: PMC7495754 DOI: 10.1021/acsomega.0c02725] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Accepted: 08/19/2020] [Indexed: 06/11/2023]
Abstract
A fine cylindrical chemical sensor tip is developed with optical fiber in the core, surrounded by a transparent cylinder of photopolymer Norland Optical Adhesive 61 (NOA 61), and covered by a polymer hydrogel mixed with sensing molecules. The overall diameter is as small as 1.5 mm. pH response is demonstrated using two approaches of sensing materials: (i) absorbing probe Phenol Red mixed with Rhodamine 6G fluorescent dye and (ii) 8-hydroxypyrene-1,3,6-trisulfonic acid fluorescent probe. Both the optical excitation and fluorescence signal collection are through the optical fibers. A time resolution of 10 s is achieved for pH variations. Good linearity is observed in the physiological range from pH 7.0 to pH 8.6 with reversible and reproducible outcomes. For in vitro urea measurement, the sensor tip can distinguish 1, 3, and 5 mM urea solution, which is a crucial range in saliva urea concentration. The miniaturized tip with such simple cylindrical symmetry is designed to detect vital signs during minimally invasive surgeries and can be potentially accompanied with endoscopes to enter human bodies.
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Affiliation(s)
- Hsin-Hsien Ho
- Institute
of Electronic Engineering, National Tsing
Hua University, Hsinchu 300, Taiwan
| | - Anh-Thi Nguyen
- Institute
of Physics, National Chiao Tung University, Hsinchu 300, Taiwan
| | - Yen-Chi Chen
- Department
of Mechanical Engineering, National Chiao
Tung University, Hsinchu 300, Taiwan
| | - Li-Yin Chen
- Department
of Photonics, College of Electrical and Computer Engineering, National Chiao Tung University, Hsinchu 300, Taiwan
| | - Huu-Phuoc Dang
- Institute
of Physics, National Chiao Tung University, Hsinchu 300, Taiwan
| | - May-Jywan Tsai
- Department
of Neurosurgery, Neurological Institute, Taipei Veterans General Hospital, Taipei 11217, Taiwan
| | - Henrich Cheng
- Department
of Neurosurgery, Neurological Institute, Taipei Veterans General Hospital, Taipei 11217, Taiwan
| | - Sheng-Fu Horng
- Institute
of Electronic Engineering, National Tsing
Hua University, Hsinchu 300, Taiwan
| | - Cheng-Sheng Huang
- Department
of Mechanical Engineering, National Chiao
Tung University, Hsinchu 300, Taiwan
| | - Hsiao-Wen Zan
- Department
of Photonics, College of Electrical and Computer Engineering, National Chiao Tung University, Hsinchu 300, Taiwan
| | - Hsin-Fei Meng
- Institute
of Physics, National Chiao Tung University, Hsinchu 300, Taiwan
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