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Regenerative Biomaterials 2022年第1期9卷 625-635页

作者： Bukola O.Awonusi Jianzhong Li Hongwei Li Zhenyu Wang Ke Yang Jing Zhao Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei230026China Department of Urology General Hospital of Northern Theater CommandShenyang110840China

Ureteral stents are commonly utilized as a medical device to aid the flow of urine.However,biofilm formation and encrustation complications have been clinical problems.To overcome this challenge,heparin/poly-L-lysine-copper(Hep/PLL-Cu)nanoparticle was immobilized on a dopamine-coated polyurethane surface(PU/NPs).The stability and structural properties of the nanoparticles were characterized by Zeta potential,poly dispersion index,transmission electron microscopy,atom force microscopy and contact angle.The surface composition,antibacterial potency,encrustation resistance rate and biocompatibility of PU/NPs were investigated by scanning electron microscope,X-ray photoelectron spectroscopy,antibacterial assay and MTS assay,respectively.In addition,the antiencrustation property was studied by implanting coated NPs stents in the rat bladder for 7 days.It was shown that the size and distribution of Hep/PLL-Cu nanoparticles were uniform.PU/NPs could inhibit Proteus mirabilis proliferation and biofilm formation,and exhibit no cytotoxicity.Less encrustation(Ca and Mg salt)was deposited both in vitro and in vivo on samples,demonstrating that the NPs coating could be a potential surface modification method of ureteral material for clinical use.

关键词： ureteral stents nanoparticles biofilm encrustation

Epi- and endobiont faunal communities on an Egyptian Mediterranean rocky shore: species composition and their competition for space

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Journal of Oceanology and Limnology 2021年第1期39卷 198-207页

作者： Magdy EL HEDENY Mohamed RASHWAN Sebastián RICHIANO Saleh AL FARRAJ Ghada AL BASHER Department of Geology Faculty of ScienceAlexandria UniversityAlexandria 21568Egypt Department of Biological and Geological Sciences Faculty of EducationAlexandria UniversityAlexandria 14037Egypt Instituto Patagónico de Geología y Paleontología(CONICET-CENPAT) Puerto Madryn 9120Argentina Department of Zoology College of SciencesKing Saud UniversityP.O.Box 2455Riyadh 11451Saudi Arabia

The exposed calcareous rocky area of the Abu Qir Headland,east of Alexandria,Egypt which range from coarse grains,through pebbles,cobbles,and boulders to rocky platforms,was signifi cantly colonized by sclerobionts(epibionts and endobionts).The epibiont species diversity was comparatively higher than that of endobionts.Epibiont communities included bryozoans(the anascan-grade cheilostome Bifl ustra savartii),serpulid(Hydroides elegans,Spirobranchus cf.tetraceros,Vermiliopsis striaticeps and Protula or Apomatus)and spirorbid(Spirorbis)wormtubes,and balanoid barnacles(Amphibalanus amphitrite,Balanus trigonus,and Perforatus perforatus).The cheilostome bryozoan colonies,which developed extensive sheets,proliferated on the study rocky shore either encrusting the bioeroded basement directly,or encrusting other epilithic taxa,particularly balanoid barnacles and serpulid worms.Encrusters displayed a remarkable marginal competitive interaction(overgrowth and stand-off)for space on the study rocky shore.On the other hand,endobionts were not well represented on the studied rocky shore exposure.It was possible to identify three ichnotaxa:Gastrochaenolites,Maeandropolydora,and Finichnus.The fi ndings documented represent a signifi cant contribution to our knowledge of sclerobionts composition,sequence of their colonization and/or bioerosion,and their mutual relationships on the intertidal rocky shore of the Abu Qir Headland.

关键词： sclerobionts encrustation bioerosion Mediterranean Egypt

In vivo study on heparin/poly-L-lysine-copper coating for surface functionalization of ureteral stent

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Regenerative Biomaterials 2022年第1期9卷 955-962页

作者： Bukola O.Awonusi Jianzhong Li Hongwei Li Zhenyu Wang Jiyuan Hu Ke Yang Jing Zhao Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China Department of Urology General Hospital of Northern Theater CommandShenyang 110840China Department of Urology The First Affiliated Hospital of China Medical UniversityShenyang 110001China

Polyurethane(PU)ureteral stents are used in clinics to maintain the ureteral patency.Due to biofilm formation and encrustation complications,long-term clinical usage has been limited.It is therefore necessary to develop an effective response to this unmet medical need.A heparin/poly-L-lysine/copper(NPs)coating was developed in our previous work that showed the effect of preventing infection and encrustation in vitro.In this work,a further study was conducted by grafting NPs on clinical ureteral stents that then were implanted into the infectious bladders of Wistar rats to investigate the effects of nanoparticles on bacterial growth and crystal deposition in vivo.It was found that decreased numbers of adherent microbes,urease amount splitting by bacteria,and deposited crystals were observed on the NPs stents with significant differences in comparison with PU stents.Besides,histological analysis showed that the NPs stents decreased the host tissue inflammation in close relation to the decrease biofilm formation and encrustation after 28 days of implantation.

关键词： ureteral stent heparin/PLL-Cu nanoparticles in vivo implantation bacterial adhesion encrustation

A New Biomaterial for Urinary Catheters

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Journal of Biomaterials and Nanobiotechnology 2018年第1期9卷 1-12页

作者： Roberto Santos Lima Salvador Vilar Correia Lima José Lamartine De Andrade Aguiar Eziel Cavalcanti Vasconcelos Rocha Flávia Cristina Morone Pinto Life Sciences Center Federal University of Pernambuco (UFPE) Caruaru Brazil Postgraduate Program in Surgery Department of Surgery Center for Health Sciences Federal University of Pernambuco (UFPE) Recife Brazil

Several studies argue that an ideal biomaterial for urinary catheters is utopian. Based in literature review it seems to be true. However, research advances: the biomaterial itself, new designs, new coatings, associated drugs, etc. Once implanted and interacting with urine, two old problems persist: encrustation and bacterial colonization. In this context, an extracellular product from bacterial synthesis on sugarcane molasses biomaterial has been studied in several experimental and clinical studies. Based on its high biocompatibility, the aim of this study is to evaluate its performance in an in vivo model as an endourologic prosthesis implanted in the bladder of Wistar rats. We evaluate physical, chemical and biological phenomena in comparison to an already established biomaterial, polyurethane. Even though it is not a finished product, the sugarcane biopolymer presented similar performance compared to polyurethane in several analyzed parameters and has an important characteristic: low cost.

关键词： Biomaterial Urinary Catheters encrustation

Forgotten Ureteral Stents in a Tertiary Hospital in Accra and a Review of Endourological Management of Upper Urinary Tract Pathologies in the West Africa Sub-Region

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Open Journal of Urology 2016年第6期6卷 102-108页

作者： Lemuel Davies Bray Mathew Yamoah Kyei James Edward Mensah Kwadwo Ntiamoah Ampadu Isaac Obeng Asiedu Bernard Toboh Evans Akpakli Foli Ashiagbor Joseph Awuku-Asabre Mawuenyo Oyortey Department of Surgery and Urology School of Medicine and Dentistry College of Health Sciences University of Ghana Accra Ghana Ureteral Stent Encrustation Endourology West Africa

Background: Forgotten ureteral stent is defined as prolong indwelling ureteral stent whose function is no longer desired. Ureteral stents are used in the management of upper urinary tract pathologies. Prolonged indwelling ureteral stents may be complicated by urosepsis or renal failure, encrustation, stone formation, spontaneous fracture which may either be retained or voided in the urine (stenturia). Hitherto, these complications were managed by open procedures alone in our center. We report our recent experience in endourology with the management of three cases of forgotten ureteral stents with durations of ten years and two years (two cases) and review endourological practice in West Africa. Conclusion: Although encrusted stents can be managed successfully by minimally invasive approaches in the majority of cases, the best treatment is prevention. Urology units should have preferably an electronic stent register such that when the time for removal is due, the patient's name and details are flagged red. If electronic register is not available, then a hard paper/book register should be made to prevent situations of forgotten stents. Also, efforts must be made to improve endourological services in the West Africa subregion to allow patients to have the benefit of endourology in the management of upper urinary tract pathologies including that of stones originating from an encrusted or fractured forgotten ureteral stent.

关键词： Ureteral Stent encrustation Endourology West Africa