Research context and placement

Public text directly addresses lens blood/protein fouling and lubricant maintenance/reprocessing.

Endoscope-lens fouling, fogging and durability

Antifouling lenses also require transparency and durability. Direct engraving addresses detachment associated with particle coatings. A repellent lens is not useful if its structure compromises transmission. Repeated contact and sterilization can also change an initially effective surface, requiring optical, surface and maintenance conditions to be evaluated together.

Approach and advances

Laser structures receive a fluorinated layer and lubricant. Comparing lubricant transmission led to a near-index-matched choice, making infusion an optical as well as repellency design. Direct engraving leaves the supporting structure in the lens rather than in an added particle layer. The fluorinated treatment favors lubricant retention, while the liquid fills that structure; the solid scaffold and liquid interface perform different jobs.

Panels show fogging setup and time-sequence images, droplet behavior, and endoscope views and plots after blood spray or immersion.
Figure 4 · Original paper figure

Tests comparing optical visibility of LIDENS-treated glass under steam and blood exposure.

Yeontaek Lee, Yong-Woo Chung, Jaeho Park et al.. “Lubricant-infused directly engraved nano-microstructures for mechanically durable endoscope lens with anti-biofouling and anti-fogging properties”. Figure 4. DOI: 10.1038/s41598-020-74517-8. CC BY 4.0. Public original image copied byte-for-byte, with no resizing, cropping, annotations or re-encoding.

Source figure and caption ↗ · DOI: 10.1038/s41598-020-74517-8 ↗ · CC BY 4.0 ↗

Evaluation and conditions

Tests address optics, blood, condensation, peeling, abrasion and sterilization. Visibility and surface damage provide complementary endpoints. Peeling/abrasion probe structural damage, whereas blood and condensation tests probe effects on visibility. Sterilization adds temperature/pressure and lubricant replenishment, making it a separate maintenance condition rather than another interchangeable wear count.

Key findings

Tape-peeling tests showed better retention of structure and wetting properties for LIDENS than for the particle-based coating control. Separate linear-abrasion tests compared LIDENS before and after loading, finding retained structure and small changes in contact angle and hysteresis. Relubrication restored poststerilization performance, distinguishing a durable engraved scaffold from a replenishable liquid layer. Recovery through replenishment does not imply that lubricant is never depleted.

Limits and open questions

Sterilization includes relubrication each cycle. It does not establish maintenance-free life; structure, optics and loading must be matched. Clinical comparisons must match when lubricant is replenished as well as how sterilization is performed. The read experiments support condition-specific optical and durability claims, not a complete service-life estimate for repeated surgery.

Related external research

Bioinspired self-repairing slippery surfaces with pressure-stable omniphobicity

DOI: 10.1038/nature10447 ↗

Compare SLIPS lubrication with LIDENS optical-transmission requirements.

Generic repellency does not establish endoscopic visibility.

Abstract checked

Corresponding-author verification

Jungmok Seo: corresponding author

This record concerns Jungmok Seo’s correspondence designation. Author order or an asterisk alone is not treated as confirmation; this check is separate from verification of the research content.

Main-text review scope
Europe PMC XML Results and discussion: structure/design, optics, blood/fogging, tape-peel/abrasion and autoclave/relubrication tests. Additional targeted main-text reading in this pass: Results and discussion, Fig. 1a lubricant choice; Fig. 3 abrasion and autoclave paragraphs, explicit relubrication and contrast with particle-based coating. SI referenced by body was not separately read. This additional reading refers to main text, not supplementary information. The approval review distinguished direct particle-based-coating comparison in tape peeling, before/after abrasion within LIDENS, and repeated autoclaving with relubrication.
Supplementary review scope
Supplementary information was not read. No supplementary material is listed as reviewed, and a complete SI audit is not claimed.
Pending verification
SI and direct comparison with the current publisher version remain unaudited. Main-text sterilization tests include relubrication and do not establish maintenance-free or clinical reuse life.

COVERAGE & OUTREACH

Coverage and outreach

Links are checked for their relationship to this paper. Media publication does not establish independent reporting or additional experimental validation.

No related outreach link was verified against its body within these searches. This does not establish that none exists.

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Sources and verification scope

Europe PMC XML Results and discussion: structure/design, optics, blood/fogging, tape-peel/abrasion and autoclave/relubrication tests. Additional targeted main-text reading in this pass: Results and discussion, Fig. 1a lubricant choice; Fig. 3 abrasion and autoclave paragraphs, explicit relubrication and contrast with particle-based coating. SI referenced by body was not separately read. This additional reading refers to main text, not supplementary information. The approval review distinguished direct particle-based-coating comparison in tape peeling, before/after abrasion within LIDENS, and repeated autoclaving with relubrication.

The additional commentary is editorially approved within the stated evidence scope. This does not imply complete verification of all main-text and supplementary material.

Additional main-text review scope
Europe PMC XML Results and discussion: structure/design, optics, blood/fogging, tape-peel/abrasion and autoclave/relubrication tests. Additional targeted main-text reading in this pass: Results and discussion, Fig. 1a lubricant choice; Fig. 3 abrasion and autoclave paragraphs, explicit relubrication and contrast with particle-based coating. SI referenced by body was not separately read. This additional reading refers to main text, not supplementary information.
Additional supplementary review scope
Supplementary information was not read. No supplementary material is listed as reviewed, and a complete SI audit is not claimed.