Multi-point Multi-dimensional Micro-force Sensing Instrument for Ophthalmic Surgery

doi:10.3901/JME.2024.23.053

Abstract

Abstract: Eye tissue is very fragile, and a force of millinewton level will cause damage to the eye tissue. This tiny force has exceeded the perception limit of doctors. In order to solve the problem that the force between the surgical forceps and the eye tissue is small and difficult to perceive, a multi-point micro-force sensing method based on fiber Bragg grating (FBG) sensor is proposed. According to the requirement of multi-point and multi-dimensional micro-force perception in retinal surgery, a new FBG layout is proposed. The theoretical model of radial deformation and FBG wavelength of the instrument under the multi-point force hypothesis was established, the temperature compensation method was designed, and the micro-force sensing method was formed to realize synchronous and accurate sensing of the radial force of the tip, the radial force of the sclera and the contact position of the sclera. Finally, a prototype of the micro-force sensing surgical forceps was made and calibrated by experiments. The experimental results showed that the root mean square errors of the radial force of the tip, the radial force of the sclera and the sclera contact position were 0.2353 mN, 1.51 mN and 0.5730 mm, respectively. The sensing accuracy of force and position met the requirements of ophthalmic surgery.

Key words: fiber Bragg gratings, multi-point multi-dimensional micro-force sensing, ophthalmic operating instrument, macular detachment surgery

CLC Number:

TP212

LIU Jianjun, YANG Yang, ZHENG Yu, GUANG Chenhan, LIN Chuang, WANG Chaodong. Multi-point Multi-dimensional Micro-force Sensing Instrument for Ophthalmic Surgery[J]. Journal of Mechanical Engineering, 2024, 60(23): 53-62.

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