Amorphous Carbon Coatings Inhibit Crystalline Biofilm Formation on Urological Implants

Kleinen, Lisa; Böde, Ulla; Schenk, Karin; Busch, Heinz; Bradenahl, J.; Müller, Stefan; Hillebrands, B.; Laube, Norbert

doi:10.1002/ppap.200731005

Cited by 28 publications

(22 citation statements)

References 24 publications

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“…They were deposited on the reference PU-tubes (#1) by radio-frequency plasma-enhanced chemical vapor deposition (RF-PECVD) from acetylene gas (C 2 H 2 ) as described in (Kleinen et al 2007). Surfaces #9 and #10A were deposited from pure C 2 H 2 -plasma, however, under different physical conditions (gas pressure, RF-power).…”

Section: Methodsmentioning

confidence: 99%

Ureteral stents should be soaked for several minutes before placement

Laube¹,

Desai

Bernsmann

et al. 2015

SpringerPlus

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PurposePlacement of ureteral stents (DJ-stents) may lead to complications. Inappropriate friction properties of the implant are, inter alia, made responsible for primary injuries, injury-related inflammation and a cascade of consecutive side effects. Hydrophilicity is considered to be related to low friction. The question arises, whether the various products on the market show their respective maximum hydrophilicity directly after unwrapping or a pre-use moistening, as already routinely done with the guide wire, is necessary.MethodsThe surface wettability of commercial and experimental DJ-stents was determined by water contact angle (WCA) measurements using the sessile drop method. One reference surface and 11 different stent surface types were tested. In order to determine the influence of moistening on the stents’ surface wettability, WCAs were measured twice, with dry, and soaked (30 min, 0.9%-NaCl) specimens. Each sample of a surface type was tested at three different positions to avoid effects of surface heterogeneities. Up to six samples of the same surface type were examined.ResultsMean WCAs on fresh and soaked stent surfaces ranged from 75°–103° and 71°–99°. In every case the WCAs on soaked surfaces were lower. On average the WCAs decrease by 7%, the individual decreases differ considerably, from 2 to 16%. For 7/12 of the examined surface types, the decrease in contact angle is statistically significant with p ≤ 0.01.ConclusionsDJ-stents freshly unwrapped show less hydrophilic properties compared to DJ-stents soaked in saline. To obtain maximum hydrophilicity at stent placement, DJ-stents should be soaked. The results may advocate a similar approach for other urological equipment.

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Section: Methodsmentioning

confidence: 99%

Ureteral stents should be soaked for several minutes before placement

Laube¹,

Desai

Bernsmann

et al. 2015

SpringerPlus

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“…This method results in a higher degree of cross-linked sp 3 carbon centers in the coating because of more subplantation processes [30]. In the indirect deposition for f-type mainly radical species are present and diffuse on the substrate surface because the sample's face is presented opposite to the plasma without being in line of sight with the plasma source [31]. Different thicknesses were produced by varying the length of the deposition time, dependent on a deposition rate of 2 nm/min for the f-type and of 10 nm/min for the r-type.…”

Section: Sample Preparation and Coatingmentioning

confidence: 98%

“…The coating process was done using radio frequency plasma-enhanced chemical vapor deposition (RF-PECVD). A detailed description of the RF-driven (13.6 MHz) commercially available plasma source (model COPRA DN 400, CCR GmbH, Troisdorf, Germany) is given in references [29,30] and the process of coating is described in detail in references [28,[31][32][33]. The entire coating process consists of two steps.…”

Section: Sample Preparation and Coatingmentioning

confidence: 99%

Surface morphology and grain analysis of successively industrially grown amorphous hydrogenated carbon films (a-C:H) on silicon

Catena

McJunkin

Agnello

et al. 2015

Applied Surface Science

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“…The coating process was performed as described previously [15,16,[18][19][20][21]. In difference to the setup used in [15,16], here six of the trays at a time were placed onto a turntable in a high vacuum chamber.…”

Section: Methodsmentioning

confidence: 99%

DLC‐coated pure bioplastic foil

Rohrbeck¹,

Fischer²,

Wehner

et al. 2014

Vak Forsch Prax

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Polymers made of renewable resources increasingly replace conventional plastic materials made of petroleum. Socalled bioplastics can be found e. g. in food industry, for agricultural usage or in the medical field. The range of applications can be further expanded with specialized coating of their surface. Especially in case of food packaging and the usage within medical devices as well as the storage of these composite materials, sterilization or at least the partial reduction of microbial growth is an important issue which needs to be addressed early in the production process. In this work, a commercially available polyhydroxyalkanoate (PHA) pure bioplastic foil of 50 μm thickness was coated with 100 nm of diamond‐like carbon (DLC) and afterwards treated by four different standard methods of sterilization and / or disinfection, namely deep‐freezing, ultraviolet irradiation, autoclaving and immersion in ethanol. The surface morphology of treated DLC‐coated and uncoated samples was investigated and compared to the untreated DLC‐coated and uncoated samples using scanning electron microscopy (SEM) and atomic force microscopy (AFM). Measurements exhibited damage of the composite for autoclaved and in ethanol immersed samples, whereas deep‐frozen and ultraviolet irradiated samples showed no structural changes. These findings clearly demonstrate deep‐freezing and ultraviolet irradiation to be appropriate methods for the disinfection and sterilization, respectively, of the DLC‐coated pure bioplastic foil.

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Amorphous Carbon Coatings Inhibit Crystalline Biofilm Formation on Urological Implants

Cited by 28 publications

References 24 publications

Ureteral stents should be soaked for several minutes before placement

Ureteral stents should be soaked for several minutes before placement

Surface morphology and grain analysis of successively industrially grown amorphous hydrogenated carbon films (a-C:H) on silicon

DLC‐coated pure bioplastic foil

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