Micro-structured glass probe for endoscopic Optical Coherence Tomography

González-Cerdas, Gerardo; Stein, Patrick; Kretschmer, Simon; Bauer, Christoph; Sandic, Dragan; Ataman, Çağlar; Zappe, Hans

doi:10.1117/12.2555069

Cited by 3 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…17 With a precision that can attain 1 to 5 μm depending on the specific structure, it allows for optomechanical designs that can be precisely tuned during production and assembly, facilitating the mounting and interconnection of components to provide a robust fabrication process. 11,12,18 To reach such tight fabrication tolerances, both the laser-writing and chemical etching steps of the process need to be fine-tuned through various iterations, which can be time-consuming and is not suitable for fast prototyping. However, once the appropriate control parameters have been found for a specific design, it can be easily replicated in batch.…”

Section: Manufacturing Of the Probe Head Assembly Platformmentioning

confidence: 99%

“…This was fabricated through SLE (LightFab GmbH), a two-step subtractive 3D microstructuring process that can provide a selectivity of up to 1:1500 17 . With a precision that can attain 1 to 5 μm depending on the specific structure, it allows for optomechanical designs that can be precisely tuned during production and assembly, facilitating the mounting and interconnection of components to provide a robust fabrication process 11 , 12 , 18 . To reach such tight fabrication tolerances, both the laser-writing and chemical etching steps of the process need to be fine-tuned through various iterations, which can be time-consuming and is not suitable for fast prototyping.…”

Section: Fabrication and Assemblymentioning

confidence: 99%

“…An auxiliary structure was also manufactured to aid in the assembly of the glass holder and the focusing lens on the fiber tip, as previously presented by the authors in Ref. 12 and 18. The streamlined and precise process enabled by this approach allows for an increase in fabrication yield and reduces the assembly time, as well as the risk of damage or misalignment during the critical fixing steps.…”

Section: Fabrication and Assemblymentioning

confidence: 99%

See 2 more Smart Citations

Preclinical-grade microendoscope for optical coherence tomography and angiography inside the bladder

González-Cerdas

Taege

Jund

et al. 2023

J. Optical Microsystems

Self Cite

View full text Add to dashboard Cite

We present a preclinical-grade, forward-viewing endomicroscope for in-contact optical coherence tomography (OCT) and optical coherence angiography (OCA) imaging through the working channel of a conventional cystoscope. Beam scanning is achieved with a fiber scanner driven by a tubular piezoelectric actuator. A focusing lens at the fiber tip helps engineering of the operation frequency within a compact probe length to avoid lateral undersampling. Microstructuring of fused silica through selective laser-induced etching was used for manufacturing a self-aligning housing for the probe head. The entire micro-optical system is assembled and encapsulated within a custom-developed sterilizable packaging with 4.5 mm outer diameter. The presented design and fabrication strategy can be used for any forward-viewing probe, independent of its imaging modalities. We demonstrate OCT imaging within a 2.1-mm diameter field of view at a transverse resolution of 19 μm and microvasculature visualization through OCA. The presented probe's mechanical characteristics and optical performance make it particularly attractive for outpatient care use in the detection of tissue pathology inside the bladder. The presented fabrication methodology provides a reliable strategy for enabling preclinical trials with endoscopic imaging probes.

show abstract

Section: Manufacturing Of the Probe Head Assembly Platformmentioning

confidence: 99%

Section: Fabrication and Assemblymentioning

confidence: 99%

Section: Fabrication and Assemblymentioning

confidence: 99%

See 1 more Smart Citation

Preclinical-grade microendoscope for optical coherence tomography and angiography inside the bladder

González-Cerdas

Taege

Jund

et al. 2023

J. Optical Microsystems

Self Cite

View full text Add to dashboard Cite

show abstract

“…The alignment of the oscillating fiber and lens, however, requires to be taken care of separately. In our previous work, this has been achieved by sliding a two-dimensional alignment structure, in which all optical components are placed, into the housing [18]. After fixing all components in place, the fiber assembly was slightly lifted and subsequently removed.…”

Section: Multi-axes Free-form Assembly Platformmentioning

confidence: 99%

“…Fiber scanners can address this shortcoming by allowing a reduction of the resonance frequency as desired via the cantilever length or tip weights [14]. Particularly compact scanners can be realized using beam-shaping optics at the tip of the fiber cantilever [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Manufacturing and assembly of an all-glass OCT microendoscope

Taege

González-Cerdas

Jund

et al. 2021

J. Micromech. Microeng.

View full text Add to dashboard Cite

We present a forward-looking, fiber-scanning endomicroscope designed for optical coherence tomography (OCT) and OCT-Angiography (OCT-A) imaging through the working channel of commercial gastrointestinal endoscopes and cystoscopes. 3.4 mm in outer diameter and 11.9 mm in length, the probe is capable of high-resolution volumetric imaging with a field-of-view of up to 2.6 mm and an imaging depth of up to 1.5 mm at a lateral resolution of 19 µm. A high-precision lens mount fabricated in fused silica using selective laser-induced etching (SLE) allows the tailoring of the optical performance for different imaging requirements. A glass structure fabricated by the same method encapsulates the optical and mechanical components, providing ease of assembly and alignment accuracy. The concept can be adapted to high resolution OCT/-A imaging of various organs, particularly in the gastrointestinal tract and bladder.

show abstract