Needle-size fibre endoscope with 3D printed DOEs for minimally invasive procedures in biomedicine

Elias Scharf; Robert Kuschmierz; Ronja Stephan; Michael Steinke; Jürgen Czarske

doi:10.1117/12.2620319

30 May 2022 Needle-size fibre endoscope with 3D printed DOEs for minimally invasive procedures in biomedicine

Elias Scharf, Robert Kuschmierz, Ronja Stephan, Michael Steinke, Jürgen Czarske

Proceedings Volume PC12144, Biomedical Spectroscopy, Microscopy, and Imaging II; PC121440L (2022) https://doi.org/10.1117/12.2620319
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Abstract

Endoscopes with 3D imaging have been known for some time. Additional information about the depth allows further statements during the examination and better visualisation. However, the measuring heads of such endoscopes are bulky, since they must accommodate optics that enable axial scanning. Hence, the field of application remains very limited. We present an endoscope without optics on the distal end and a significantly smaller measuring head in the sub-millimetre range. This enables endoscope technology to be used in new areas of surgery, such as in brain or cochlea. Conventional endoscopes are too large for these regions. A static phase correction has been demonstrated to be sufficient to maintain phase information. Hence, programmable optics like spatial light modulators are no longer needed. Therefore, we applied 3D printed phase masks using 2-photon polymerisation. This allows a robust and cost-efficient system to be realised. In addition to the process of printing phase correction DOEs, we also present a new setup which allows the sample in front of the endoscope head to be imaged through the fibre bundle directly to a camera sensor. No raster scan is required like in past approaches. Hence, an image can be generated in a single shot without further computational reconstruction.

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Citation Download Citation

Elias Scharf, Robert Kuschmierz, Ronja Stephan, Michael Steinke, and Jürgen Czarske "Needle-size fibre endoscope with 3D printed DOEs for minimally invasive procedures in biomedicine", Proc. SPIE PC12144, Biomedical Spectroscopy, Microscopy, and Imaging II, PC121440L (30 May 2022); https://doi.org/10.1117/12.2620319

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KEYWORDS

Endoscopes

Spatial light modulators

Phase measurement

Photomasks

Speckle

Surgery

Two photon polymerization

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