Twisting measurement and compensation of optical shape sensor based on spun multicore fiber

Floris, Ignazio; Madrigal, Javier; Sales, Salvador; Calderón, Pedro A.; Adam, José M.

doi:10.1016/j.ymssp.2020.106700

Cited by 45 publications

(22 citation statements)

References 35 publications

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“…Fabrication of the MCFBG is more costly than single-mode fibers (SMF) 23 and these fibers are influenced by the twisting effect that gives rise to uncertainty in bending direction parameters. Floris et al suggested re-twisting and compensation of this twisting effect for MCFBG 26 .…”

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confidence: 99%

Design and analysis of a fiber-optic sensing system for shape reconstruction of a minimally invasive surgical needle

Issatayeva

Amantayeva

Blanc

et al. 2021

Sci Rep

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This paper presents the performance analysis of the system for real-time reconstruction of the shape of the rigid medical needle used for minimally invasive surgeries. The system is based on four optical fibers glued along the needle at 90 degrees from each other to measure distributed strain along the needle from four different sides. The distributed measurement is achieved by the interrogator which detects the light scattered from each section of the fiber connected to it and calculates the strain exposed to the fiber from the spectral shift of that backscattered light. This working principle has a limitation of discriminating only a single fiber because of the overlap of backscattering light from several fibers. In order to use four sensing fibers, the Scattering-Level Multiplexing (SLMux) methodology is applied. SLMux is based on fibers with different scattering levels: standard single-mode fibers (SMF) and MgO-nanoparticles doped fibers with a 35–40 dB higher scattering power. Doped fibers are used as sensing fibers and SMFs are used to spatially separate one sensing fiber from another by selecting appropriate lengths of SMFs. The system with four fibers allows obtaining two pairs of opposite fibers used to reconstruct the needle shape along two perpendicular axes. The performance analysis is conducted by moving the needle tip from 0 to 1 cm by 0.1 cm to four main directions (corresponding to the locations of fibers) and to four intermediate directions (between neighboring fibers). The system accuracy for small bending (0.1–0.5 cm) is 90$$\%$$ % and for large bending (0.6–1 cm) is approximately 92$$\%$$ % .

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confidence: 99%

Design and analysis of a fiber-optic sensing system for shape reconstruction of a minimally invasive surgical needle

Issatayeva

Amantayeva

Blanc

et al. 2021

Sci Rep

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“…A multicore optical fibre can be secured on the bone during future in vivo trials. If the axial strain is negligible during compression loading, then the central core’s wavelength shift can be measured and considered for temperature change [ 28 , 31 ].…”

Section: Discussionmentioning

confidence: 99%

“…FBG sensors also have an added benefit due to their low conductivity, which makes them ideal for clinical applications. The multicore optical sensors are also utilised in shape-sensing of medical instruments, including catheters, by calculating the twists in fibres based on the measured longitudinal strains in each fibre core and performing 3D shape reconstruction of the objects [ 28 , 29 , 30 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

Application of Fibre Bragg Grating Sensors in Strain Monitoring and Fracture Recovery of Human Femur Bone

et al. 2020

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Fibre Bragg Grating (FBG) sensors are gaining popularity in biomedical engineering. However, specific standards for in vivo testing for their use are absolutely limited. In this study, in vitro experimental tests were performed to investigate the behaviors and applications of gratings attached to intact and fractured thighbone for a range of compression loading (<300 N) based around some usual daily activities. The wavelength shifts and the corresponding strain sensitivities of the FBG sensors were measured to determine their effectiveness in monitoring the femoral fracture healing process. Four different arrangements of FBG sensors were selected to measure strains at different critical locations on the femoral sawbones surface. Data obtained for intact and plated sawbones were compared using both embedded longitudinal and coiled FBG arrays. Strains were measured close to the fracture, posterior linea aspera and popliteal surface areas, as well as at the proximal and distal ends of the synthetic femur; their responses are discussed herein. The gratings on the longitudinally secured FBG arrays were found to provide high levels of sensitivity and precise measurements, even for relatively small loads (<100 N). Nevertheless, embedding angled FBG sensors is essential to measure the strain generated by applied torque on the femur bone. The maximum recorded strain of the plated femur was 503.97 µε for longitudinal and −274.97 µε for coiled FBG arrays, respectively. These project results are important to configure effective arrangements and orientations of FBG sensors with respect to fracture position and fixation implant for future in vivo experiments.

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“…Shape sensing methods make use of a single multicore fiber [ 17 ], or multiple fibers [ 18 ], to reconstruct in real time the deformation of the sensorized device without the use of radiation. Methods based on multicore fibers or multicore FBGs are used in flexible medical devices or soft manipulators [ 19 ], as they consistently detect distributed curvatures with narrow bending radii, by detecting the strain differential between multiple cores [ 20 ]. Multicore fibers are, however, unsuitable for rigid needles, as they cannot detect large bending radii, which are typically as high as thousands of meters in epidural needles since the displacement at the tip of the needle is in the order of fractions of a millimeter [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

Fiber Optic Distributed Sensing Network for Shape Sensing-Assisted Epidural Needle Guidance

et al. 2021

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Epidural anesthesia is a pain management process that requires the insertion of a miniature needle through the epidural space located within lumbar vertebrae. The use of a guidance system for manual insertion can reduce failure rates and provide increased efficiency in the process. In this work, we present and experimentally assess a guidance system based on a network of fiber optic distributed sensors. The fibers are mounted externally to the needle, without blocking its inner channel, and through a strain-to-shape detection method reconstruct the silhouette of the epidural device in real time (1 s). We experimentally assessed the shape sensing methods over 25 experiments performed in a phantom, and we observed that the sensing system correctly identified bending patterns typical in epidural insertions, characterized by the different stiffness of the tissues. By studying metrics related to the curvatures and their temporal changes, we provide identifiers that can potentially serve for the (in)correct identification of the epidural space, and support the operator through the insertion process by recognizing the bending patterns.

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Twisting measurement and compensation of optical shape sensor based on spun multicore fiber

Cited by 45 publications

References 35 publications

Design and analysis of a fiber-optic sensing system for shape reconstruction of a minimally invasive surgical needle

Design and analysis of a fiber-optic sensing system for shape reconstruction of a minimally invasive surgical needle

Application of Fibre Bragg Grating Sensors in Strain Monitoring and Fracture Recovery of Human Femur Bone

Fiber Optic Distributed Sensing Network for Shape Sensing-Assisted Epidural Needle Guidance

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