Anti-fouling endoscopes and uses thereof
A transparent repellent, liquid-infused coating applied onto the distal end of an endoscope that prevents vision loss and reduces fouling is described. Also described is a disposable endoscope window that is coated in a transparent, repellant, liquid-infused coating for attachment to the distal end or distal window of an endoscope to obviate vision loss. Also described is an endoscope comprising a miniature camera coated in a transparent, repellent, liquid-infused coating.
1 . An endoscope, comprising:
an insertion tube and a proximal body, the insertion tube starting from the proximal body and having a distal end;
at the distal end of the insertion tube;
an illumination source designed to project light from an illumination emitter at the distal end of the insertion tube, and an image collector designed to collect light to form an image of objects at the distal end; and
a substrate designed to seal the distal end to exclude tissues and bodily fluids from interference with the image collector during endoscopy, the substrate designed to entrain a lubricating fluid on a wetting surface, the substrate, wetting surface, and lubricating fluid to form a protective and transparent window over the image collector, the wetting surface lying on the side of the substrate facing outwardly from the image collector into a cavity for examination by the endoscope,
the wetting surface formed by deposition of silica particles or other inorganic oxide nanoparticles onto the substrate, followed by heating to form a porous solid, the substrate's wetting surface designed to entrain a lubricating fluid at the distal end of the insertion tube, the lubricating fluid being immiscible with the bodily fluids, the wetting surface being designed to present wetting to the lubricating fluid preferentially relative to the bodily fluids, the wetting surface and the wetting it presents being designed to entrain the lubricating fluid in a layer that is ultra-smooth, slippery, and optically transparent over the wetting surface during exposure to the tissues and bodily fluids.
2 . The endoscope of claim 1 , wherein the lubricating fluid comprises silicone oil, or mixtures thereof.
3 . The endoscope of claim 2 , wherein the lubricating fluid comprises a mixture of silicone oils of different viscosities.
4 . The endoscope of claim 1 , wherein the lubricating fluid is a perfluoropolyether.
5 . The endoscope of claim 1 , wherein the wetting surface is functionalized by a coating to accept wetting by and to retain the lubricating fluid.
6 . The endoscope of claim 5 , wherein the wetting surface is functionalized to accept wetting by and to retain the lubricating fluid by a coating of partially or fully fluorinated alkyl chains using chlorosilane coupling, amide coupling, or glicydyl chemistry which is reactive with the surface of the substrate.
7 . The endoscope of claim 6 , wherein the wetting surface is functionalized to accept wetting by and to retain the lubricating fluid by a coating of (1H, 1H, 2H, 2H-tridecafluorooctyl)-trichlorosilane.
8 . The endoscope of claim 1 , wherein the substrate is integral with an optical lens for the image collector.
9 . The endoscope of claim 1 , wherein the substrate is not integral with an optical lens for the image collector.
10 . The endoscope of claim 9 , wherein the substrate is a disposable component reversibly secured to a distal window of the endoscope.
11 . The endoscope of claim 1 , wherein the wetting surface is a porous surface of the substrate, the substrate being solid, the porosity designed to preferentially accept wetting by and to retain the lubricating fluid relative to the bodily fluids.
12 . The endoscope of claim 11 , wherein the wetting surface is formed by nanoparticles.
13 . The endoscope of claim 12 , wherein the lubricating fluid is silicone oil and mixtures thereof.
14 . The endoscope of claim 1 , wherein the wetting surface is functionalized to accept wetting by and to retain the lubricating fluid by a coating of a hydrocarbon group, and the hydrocarbon group is linear, branched, or combinations thereof.
15 . The endoscope of claim 1 , wherein the lubricating fluid is selected from the group consisting of a perfluorinated fluid, tertiary perfluoroalkylamine, perfluorotri-n-pentylamine, perfluorotri-n-butylamine, a perfluoroalkylsulfide, a perfluoroalkylsulfoxide, a perfluoroalkylemer, a perfluorocycloether, a perfluoropolyether, a perfluoroalkylphosphine, a perfluoroalkylphosphmeoxides, a polydimethylsiloxane, functional modifications of polydimethylsiloxane, partially or fully fluorinated oils, and mixtures thereof.
16 . The endoscope of claim 15 , wherein the lubricating fluid is perfluoroperhydrophenanthrene or perfluorodecalin.
17 . The endoscope of claim 1 , wherein the image collector includes a CMOS or CCD chip.
18 . The endoscope of claim 1 , wherein the image collector includes a rod lens imaging lens.
19 . The endoscope of claim 1 , wherein the image collector includes a fiber optic image collector.
20 . The endoscope of claim 1 , wherein the illumination source includes a fiber optic illumination system.
21 . The endoscope of claim 1 , wherein the lubricating fluid is selected from the group consisting of food-grade oil, food compatible liquids, olive oil, canola oil, coconut oil, corn oil, rice bran oil, cottonseed oil, grape seed oil, hemp oil, mustard oil, palm oil, peanut oil, pumpkin seed oil, safflower oil, and mixtures or combinations thereof.
22 . The endoscope of claim 1 , wherein the image collector includes a camera.
23 . An optically transparent article, comprising:
a transparent substrate having a wetting surface designed to entrain a layer of a lubricating fluid on the wetting surface;
the substrate being designed to be affixed to a distal end of an insertion tube of an endoscope, the shape and affixation of the substrate being designed to:
form an operable endoscope tip with the distal end during endoscopy,
seal to exclude tissues and bodily fluids from interference with an image collector of the endoscope during endoscopy, and
present the substrate at the distal end with its wetting surface facing outwardly from the image collector into a cavity for examination by the endoscope;
the lubricating fluid layer being immiscible with biological material and bodily fluids to which the endoscope distal end is to be exposed;
the wetting surface designed to present high wetting to the lubricating fluid preferentially relative to bodily fluids to which the endoscope distal end is to be exposed, the wetting surface formed by deposition of silica particles or other inorganic oxide nanoparticles onto the substrate, followed by heating to form a porous solid designed to entrain the lubricating fluid in a layer to form an ultra-smooth, slippery, optically transparent layer over the wetting surface during exposure to the tissues and bodily fluids;
the substrate, wetting surface, and lubricating fluid being designed to form a sealed, protective and transparent window over the image collector at the distal end of the endoscope.
24 . The optically transparent article of claim 23 , wherein:
the substrate and wetting surface are designed with the lubricating fluid to form a protective and transparent window over the image collector.