A planar micro rotary actuator for endoscopic optical scanning

Searles, Kyle; Shalabi, Nabil; Jayhooni, Sayed Mohammad Hashem; Takahata, Kenichi

doi:10.1016/j.sna.2022.113768

Cited by 5 publications

(10 citation statements)

References 28 publications

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“…The maximum angle errors, calculated from the peak values of the matching coefficients, suggest that a larger scanning range leads to a greater angle error, with an average angular error of ~4° (Fig. 5D, versus about 6° in PMSMs 43 ). For simplicity, the open-loop input angle is utilized as the standard image border in B-Scan during image processing.…”

Section: Programmable Imaging Using Angle Controlmentioning

confidence: 95%

“…The phase-differential input signals to the PMSM generate a uniform rotating magnetic field that propels the permanent magnet rotor 18,43 . Taking into account safety and space compatibility (Supplementary Note 1), we propose utilizing a mono-magnet-based external magnetic actuator (EPM) to drive the RDPM in the probe (Fig.…”

Section: Characterization Of Mmat-oct Endoscopementioning

confidence: 99%

“…This leads to a reduced sampling area in OCT images, possibly causing information loss. Ferrofluid lubrication, while effective for reducing friction, is highly susceptible to contaminating reflective surfaces 19,43 . In the end, a smoother RDPM surface was achieved by applying 100 nm of silver and 200 nm of silica dioxide, resulting in a surface roughness of 0.3226 µm (Fig.…”

Section: Characterization Of Mmat-oct Endoscopementioning

confidence: 99%

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Motor-free telerobotic endomicroscopy for steerable and programmable imaging in complex curved and localized areas

Ren,

Yuan,

et al. 2024

Preprint

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Aberrations in intraluminal epithelia are precursors to a plethora of critical conditions, including various cancers, where early detection is crucial for patient prognosis. Optical Coherence Tomography (OCT) endoscopy has emerged as a promising imaging technique that provides high resolution in micrometers and imaging depth in millimeters. However, conventional proximal-scanning OCT endoscopes face challenges in imaging tortuous lumens. Motor-driven distal-scanning OCT endoscopes afford potential solutions but pose thermal and electrical risks to tissues. Crucially, these systems lack the requisite compact steering mechanisms for effective navigation within complex luminal organs, commonly involving tooltip deformations, including bending, torsion, and compression. Here, we present a motor-free telerobotic OCT endoscope of a 1.28 ~ 2.28-mm long magnetic rotator integrating a rotatable diametrically magnetized cylinder permanent magnet (RDPM) with a light reflector. Utilizing an external magnetic field effectively mitigates heat effects induced by current and voltage, yielding a maximum voltage of less than 0.02 mV and a temperature rise of no more than 0.5 °C even during continuous operation lasting one hour. Furthermore, a learning-based approach is developed to correct the common OCT imaging distortions resulting from nonuniform rotation within curved luminal organs. The endoscope demonstrates remarkable maneuverability, enabling steerable angles up to 110° under a magnetic field strength of ~ 500 mT and a gradient of ~ 0.06 mT/mm. In-vivo studies on mouse colons validate the endoscope's ability to deliver reliable angular control for localized 3D imaging, unaffected by bending and without the need for feedback. This advancement in intraluminal microimaging introduces a new guidewire-independent technique in endomicroscopy, enhancing safety and potentially improving patient care.

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Section: Programmable Imaging Using Angle Controlmentioning

confidence: 95%

Section: Characterization Of Mmat-oct Endoscopementioning

confidence: 99%

Section: Characterization Of Mmat-oct Endoscopementioning

confidence: 99%

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Motor-free telerobotic endomicroscopy for steerable and programmable imaging in complex curved and localized areas

Ren,

Yuan,

et al. 2024

Preprint

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“…Searles et al made an electromagnetic microrotation actuator with a planar and hollow structure (Figure 3a). 134 This device, integrated with the endoscope probe, was expected to significantly improve the imaging ability of probes. This work could be derived for imaging tests of different models, including animals.…”

Section: Imaging Methodsmentioning

confidence: 99%

Section: Magnetic Mnm Applications In Medicinementioning

confidence: 99%

Application of Magnetic Micro/Nanomotors in Biomedicine

Tian,

Gao,

Wang

et al. 2024

ACS Appl. Nano Mater.

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Micro/nanomotors can convert different forms of energy into mechanical motion according to the controllable direction by different mechanisms. This new nanodevice is widely used in biomedical applications such as targeted drug delivery, biological imaging, diagnosis, and detection. Although the practical medical applications of these small devices are still in the initial stage, nanomotors manifest their great potential in biomedical applications. In particular, micro/nanomotors driven by magnetic force have great advantages in biomedicine because of their controllable movement direction. In this review, different energy driven micro/ nanomotors are classified, and the recent applications of magnetic micro/nanomotors in medicine are reviewed. Finally, the problems existing in the medical applications of magnetic micro/nanomotors and the possibilities for future development are discussed.

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