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Cao X, Li Q, Li S, Xu X, Wang L, Wang M, Ding B, Bao S, Wang S, Sun B, Cui J, Wang G, Li H, Su Y. Low-Cost Photoelectric Flow Rate Sensors Based on a Flexible Planar Curved Beam Structure for Clinical Treatments. Adv Healthc Mater 2024; 13:e2304573. [PMID: 38558375 DOI: 10.1002/adhm.202304573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Revised: 03/17/2024] [Indexed: 04/04/2024]
Abstract
In clinical treatments, reliable flow rate measurements ensure accurate drug delivery during infusions, precise gas delivery during artificial ventilations, etc., thereby reducing patient morbidity and mortality. However, precise flow rate sensors are costly, so medical devices with limited budgets choose cheaper but unsatisfactory flow rate measurement approaches, leading to increased medical risks. Here, a photoelectric flow rate sensor based on a flexible planar curved beam structure (FPCBS) is proposed. The FPCBS ensures low out-of-plane stiffness of the sensitive sheet and allows large deformation in the elastic range, enabling the flow rate sensor to measure the flow rate with high sensitivity over a wide range. Meanwhile, the flow rate sensor can be mass-produced using mature materials and manufacturing technology at less than $5 each. The flow rate sensors are integrated into a commercial infusion pump to measure drug infusion and a home ventilator to monitor respiration. The results are comparable to those measured by a commercial flow rate sensor, demonstrating the applicability of the sensor. Considering its proven outstanding performance at low cost, the flow rate sensor shows great potential in clinical treatment, medical diagnosis, and other medical fields.
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Affiliation(s)
- Xinfang Cao
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Engineering Science, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Qinlan Li
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Engineering Science, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Shuang Li
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Engineering Science, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Xinkai Xu
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Engineering Science, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Liyang Wang
- Henan Key Laboratory of Medical Polymer Materials Technology and Application, Tuoren Medical Device Research and Development Institute Co., Ltd, Tuoren Health Technology Industrial Park, Changyuan County, Henan, 453000, China
| | - Mengjie Wang
- Henan Key Laboratory of Medical Polymer Materials Technology and Application, Tuoren Medical Device Research and Development Institute Co., Ltd, Tuoren Health Technology Industrial Park, Changyuan County, Henan, 453000, China
| | - Bo Ding
- Henan Key Laboratory of Medical Polymer Materials Technology and Application, Tuoren Medical Device Research and Development Institute Co., Ltd, Tuoren Health Technology Industrial Park, Changyuan County, Henan, 453000, China
| | - Shengwen Bao
- Henan Key Laboratory of Medical Polymer Materials Technology and Application, Tuoren Medical Device Research and Development Institute Co., Ltd, Tuoren Health Technology Industrial Park, Changyuan County, Henan, 453000, China
| | - Shugang Wang
- Henan Key Laboratory of Medical Polymer Materials Technology and Application, Tuoren Medical Device Research and Development Institute Co., Ltd, Tuoren Health Technology Industrial Park, Changyuan County, Henan, 453000, China
| | - Bao Sun
- Henan Key Laboratory of Medical Polymer Materials Technology and Application, Tuoren Medical Device Research and Development Institute Co., Ltd, Tuoren Health Technology Industrial Park, Changyuan County, Henan, 453000, China
| | - Jingqiang Cui
- Henan Key Laboratory of Medical Polymer Materials Technology and Application, Tuoren Medical Device Research and Development Institute Co., Ltd, Tuoren Health Technology Industrial Park, Changyuan County, Henan, 453000, China
| | - Guosheng Wang
- Henan Key Laboratory of Medical Polymer Materials Technology and Application, Tuoren Medical Device Research and Development Institute Co., Ltd, Tuoren Health Technology Industrial Park, Changyuan County, Henan, 453000, China
| | - Huiling Li
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Engineering Science, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yewang Su
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Engineering Science, University of Chinese Academy of Sciences, Beijing, 100049, China
- Beijing Key Laboratory of Engineered Construction and Mechanobiology, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China
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Ţălu Ş. Advanced morphological analysis of siloxane-hydrogel contact lenses. Microsc Res Tech 2021; 84:2702-2715. [PMID: 34036670 DOI: 10.1002/jemt.23833] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 04/29/2021] [Accepted: 05/06/2021] [Indexed: 02/05/2023]
Abstract
The purpose of this work is to provide a better understanding of three-dimensional (3-D) surface texture of siloxane-hydrogel contact lenses (CLs) using atomic force microscopy (AFM) and stereometric analysis. The 3-D surface texture characterization of unworn/worn siloxane-hydrogel CLs made of Filcon V (I FDA group) was performed with stereometric analysis. The atomic force microscopy (AFM) measurements of surface roughness and micromorphology of CLs were made using a Nanoscope V MultiMode (Bruker) in intermittent-contact mode, in air, on square areas of 5 × 5 μm. Stereometric study of 3-D surface texture was made according with ISO 25178-2:2012 for CLrins (taken from the blister and rinsed with deionized water); CLss (preserved for 12 hr in saline solution and rinsed with deionized water); CLworn-smooth (worn for 8 hr and presenting the smooth type morphology), and CLworn-sharp (worn for 8 hr and presenting the sharp-type morphology). The 3-D surface texture of siloxane-hydrogel CLs was found to have specific morphological characteristics. Statistical parameters revealed local geometrical and morphological spatial structures at nanometer scale attributed to the specific interactions at the CLs surface. Before wear, the surface micromorphology of Filcon V CLs is regular with uniformly distributed microasperities and relatively small heights (Sq = 0.6 nm). After 12 hr in saline, it is found that the micromorphology changes relatively easily, but retaining the main morphological characteristics (Sq = 1.2 nm). After 8 hr of wear, there are two typical micromorphologies: smooth type, characterized by gutter structures and isolated microasperities (Sq = 2.5 nm), while the sharp type has an appearance with compactly arranged microasperities of hill type flanked by compactly arranged microregions of valley type (Sq = 2.2 nm). Surface statistical parameters allow manufacturers in developing the next generation of CLs with improved surface texture while improving biocompatibility and minimizing the impact of the material on corneal physiology. Furthermore, the micro-elastohydrodynamic lubrication due to surface texture at a nanometer scale between the back surface of the CL with the corneal surface and the front surface of the CL with the under-surface of the eyelid can be deeper and more nuanced to understand in light of modern tribological theories.
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Affiliation(s)
- Ştefan Ţălu
- The Directorate of Research, Development and Innovation Management (DMCDI), Technical University of Cluj-Napoca, Cluj-Napoca, Romania
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Jose G, Shalumon K, Chen JP. Natural Polymers Based Hydrogels for Cell Culture Applications. Curr Med Chem 2020; 27:2734-2776. [DOI: 10.2174/0929867326666190903113004] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2018] [Revised: 08/15/2019] [Accepted: 08/20/2019] [Indexed: 02/06/2023]
Abstract
It is well known that the extracellular matrix (ECM) plays a vital role in the growth, survival
and differentiation of cells. Though two-dimensional (2D) materials are generally used as substrates for
the standard in vitro experiments, their mechanical, structural, and compositional characteristics can
alter cell functions drastically. Many scientists reported that cells behave more natively when cultured
in three-dimensional (3D) environments than on 2D substrates, due to the more in vivo-like 3D cell
culture environment that can better mimic the biochemical and mechanical properties of the ECM. In
this regard, water-swollen network polymer-based materials called hydrogels are highly attractive for
developing 3D ECM analogs due to their biocompatibility and hydrophilicity. Since hydrogels can be
tuned and altered systematically, these materials can function actively in a defined culture medium to
support long-term self-renewal of various cells. The physico-chemical and biological properties of the
materials used for developing hydrogel should be tunable in accordance with culture needs. Various
types of hydrogels derived either from natural or synthetic origins are currently being used for cell culture
applications. In this review, we present an overview of various hydrogels based on natural polymers
that can be used for cell culture, irrespective of types of applications. We also explain how each
hydrogel is made, its source, pros and cons in biological applications with a special focus on regenerative
engineering.
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Affiliation(s)
- Gils Jose
- Department of Chemical and Materials Engineering, Chang Gung University, Kwei-San, Taoyuan 33302, Taiwan
| | - K.T. Shalumon
- Department of Chemical and Materials Engineering, Chang Gung University, Kwei-San, Taoyuan 33302, Taiwan
| | - Jyh-Ping Chen
- Department of Chemical and Materials Engineering, Chang Gung University, Kwei-San, Taoyuan 33302, Taiwan
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Dutta SD, Patel DK, Lim KT. Functional cellulose-based hydrogels as extracellular matrices for tissue engineering. J Biol Eng 2019; 13:55. [PMID: 31249615 PMCID: PMC6585131 DOI: 10.1186/s13036-019-0177-0] [Citation(s) in RCA: 84] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2019] [Accepted: 05/10/2019] [Indexed: 12/13/2022] Open
Abstract
Cellulose-based hydrogels are immensely important for tissue engineering. In this review, we attempt to document the source, nature, and application of cellulose-based hydrogels as an extracellular matrix for tissue growth and regeneration. Hydrogels can be prepared either from native cellulose, including both bacterial and plant sources or from cellulose derivatives, such as methyl cellulose, carboxymethylcellulose, and hydroxypropylmethylcellulose or even metal ions such as silver. Cellulose-polymer composite (polymers that include natural sources including chitosan, starch, alginates, collagen, hyaluronic acid, and chitin) are an attractive, inexpensive, and advantageous structural material that is easy to use. Cellulose-based scaffolding materials are widely used in the regeneration of various tissues, such as bone, cartilage, heart, blood vessel, nerve, and liver, among others. In this review, we discuss the most important applications of cellulosic hydrogels in tissue engineering based on their structural compositions.
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Affiliation(s)
- Sayan Deb Dutta
- Biorobotics Laboratory, Department of Biosystems Engineering, Kangwon National University, Chuncheon, Republic of Korea
| | - Dinesh K. Patel
- The Institute of Forest Science, Kangwon National University, Chuncheon, 24341 Republic of Korea
| | - Ki-Taek Lim
- Biorobotics Laboratory, Department of Biosystems Engineering, Kangwon National University, Chuncheon, Republic of Korea
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Kubon M, Hartmann H, Moschallski M, Burkhardt C, Link G, Werner S, Lavalle P, Urban G, Vrana NE, Stelzle M. Multimodal Chemosensor-Based, Real-Time Biomaterial/Cell Interface Monitoring. ACTA ACUST UNITED AC 2018. [DOI: 10.1002/adbi.201700236] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Massimo Kubon
- NMI Natural and Medical Sciences Institute at the University of Tübingen; Markwiesenstrasse 55 D-72770 Reutlingen Germany
| | - Hanna Hartmann
- NMI Natural and Medical Sciences Institute at the University of Tübingen; Markwiesenstrasse 55 D-72770 Reutlingen Germany
| | - Meike Moschallski
- NMI Natural and Medical Sciences Institute at the University of Tübingen; Markwiesenstrasse 55 D-72770 Reutlingen Germany
| | - Claus Burkhardt
- NMI Natural and Medical Sciences Institute at the University of Tübingen; Markwiesenstrasse 55 D-72770 Reutlingen Germany
| | - Gorden Link
- NMI Natural and Medical Sciences Institute at the University of Tübingen; Markwiesenstrasse 55 D-72770 Reutlingen Germany
| | - Simon Werner
- NMI Natural and Medical Sciences Institute at the University of Tübingen; Markwiesenstrasse 55 D-72770 Reutlingen Germany
| | - Philippe Lavalle
- Institut National de la Santé et de la Recherche Médicale; INSERM Unité 1121, 11 rue Humann 67085 Strasbourg Cedex France
- Fédération de Médecine Translationnelle de Strasbourg; Fédération de Recherche Matériaux et Nanosciences Grand Est (FRMNGE); Faculté de Chirurgie Dentaire; Université de Strasbourg; 67000 Strasbourg France
| | - Gerald Urban
- IMTEK - Institute for Microsystems Engineering; University of Freiburg; Georges-Köhler-Allee 103/EG D-79110 Freiburg Germany
| | - Nihal Engin Vrana
- Institut National de la Santé et de la Recherche Médicale; INSERM Unité 1121, 11 rue Humann 67085 Strasbourg Cedex France
- Protip Medical; 8 Place de l'Hopital, 67000 Strasbourg France
| | - Martin Stelzle
- NMI Natural and Medical Sciences Institute at the University of Tübingen; Markwiesenstrasse 55 D-72770 Reutlingen Germany
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Hu L, Du M, Zhang J. Hemicellulose-Based Hydrogels Present Status and Application Prospects: A Brief Review. ACTA ACUST UNITED AC 2018. [DOI: 10.4236/ojf.2018.81002] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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7
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The study of properties and nutrient determination of hydrogel made of soybean meal (okara) using microwave-assisted heating. ACTA ACUST UNITED AC 2017. [DOI: 10.1016/j.matpr.2017.06.162] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Barar J, Aghanejad A, Fathi M, Omidi Y. Advanced drug delivery and targeting technologies for the ocular diseases. BIOIMPACTS : BI 2016; 6:49-67. [PMID: 27340624 PMCID: PMC4916551 DOI: 10.15171/bi.2016.07] [Citation(s) in RCA: 76] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/05/2015] [Revised: 02/13/2016] [Accepted: 03/18/2016] [Indexed: 02/06/2023]
Abstract
INTRODUCTION Ocular targeted therapy has enormously been advanced by implementation of new methods of drug delivery and targeting using implantable drug delivery systems (DDSs) or devices (DDDs), stimuli-responsive advanced biomaterials, multimodal nanomedicines, cell therapy modalities and medical bioMEMs. These technologies tackle several ocular diseases such as inflammation-based diseases (e.g., scleritis, keratitis, uveitis, iritis, conjunctivitis, chorioretinitis, choroiditis, retinitis, retinochoroiditis), ocular hypertension and neuropathy, age-related macular degeneration and mucopolysaccharidosis (MPS) due to accumulation of glycosaminoglycans (GAGs). Such therapies appear to provide ultimate treatments, even though much more effective, yet biocompatible, noninvasive therapies are needed to control some disabling ocular diseases/disorders. METHODS In the current study, we have reviewed and discussed recent advancements on ocular targeted therapies. RESULTS On the ground that the pharmacokinetic and pharmacodynamic analyses of ophthalmic drugs need special techniques, most of ocular DDSs/devices developments have been designed to localized therapy within the eye. Application of advanced DDSs such as Subconjunctival insert/implants (e.g., latanoprost implant, Gamunex-C), episcleral implant (e.g., LX201), cationic emulsions (e.g., Cationorm™, Vekacia™, Cyclokat™), intac/punctal plug DDSs (latanoprost punctal plug delivery system, L-PPDS), and intravitreal implants (I-vitaion™, NT-501, NT- 503, MicroPump, Thethadur, IB-20089 Verisome™, Cortiject, DE-102, Retisert™, Iluvein™ and Ozurdex™) have significantly improved the treatment of ocular diseases. However, most of these DDSs/devices are applied invasively and even need surgical procedures. Of these, use of de novo technologies such as advanced stimuli-responsive nanomaterials, multimodal nanosystems (NSs)/nanoconjugates (NCs), biomacromolecualr scaffolds, and bioengineered cell therapies need to be further advanced to get better compliance and higher clinical impacts. CONCLUSION Despite mankind successful battle on ocular diseases, our challenge will continue to battle the ocular disease that happen with aging. Yet, we need to understand the molecular aspects of eye diseases in a holistic way and develop ultimate treatment protocols preferably as non-invasive systems.
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Affiliation(s)
| | | | | | - Yadollah Omidi
- Research Centre for Pharmaceutical Nanotechnology, Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran
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Fathi M, Barar J, Aghanejad A, Omidi Y. Hydrogels for ocular drug delivery and tissue engineering. BIOIMPACTS : BI 2015; 5:159-64. [PMID: 26929918 PMCID: PMC4769784 DOI: 10.15171/bi.2015.31] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Accepted: 12/22/2015] [Indexed: 12/31/2022]
Abstract
Hydrogels, as crosslinked polymeric three dimensional networks, possess unique structure and behavior in response to the internal and/or external stimuli. As a result, they offer great prospective applications in drug delivery, cell therapy and human tissue engineering. Here, we highlight the potential of hydrogels in prolonged intraocular drug delivery and ocular surface therapy using stem cells incorporated hydrogels.
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Xia Z, Patchan M, Maranchi J, Trexler M. Structure and relaxation in cellulose hydrogels. J Appl Polym Sci 2015. [DOI: 10.1002/app.42071] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Zhiyong Xia
- The Johns Hopkins University; Applied Physics Laboratory; Laurel Maryland 20723
| | - Marcia Patchan
- The Johns Hopkins University; Applied Physics Laboratory; Laurel Maryland 20723
| | - Jeffrey Maranchi
- The Johns Hopkins University; Applied Physics Laboratory; Laurel Maryland 20723
| | - Morgana Trexler
- The Johns Hopkins University; Applied Physics Laboratory; Laurel Maryland 20723
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Zhou C, Heath DE, Sharif ARM, Rayatpisheh S, Oh BHL, Rong X, Beuerman R, Chan-Park MB. High Water Content Hydrogel With Super High Refractive Index. Macromol Biosci 2013; 13:1485-91. [DOI: 10.1002/mabi.201300191] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2013] [Revised: 06/25/2013] [Indexed: 11/10/2022]
Affiliation(s)
- Chuncai Zhou
- School of Chemical and Biomedical Engineering; Nanyang Technological University; 62 Nanyang Drive Singapore 637459 Singapore
| | - Daniel E. Heath
- BioSystems and Micromechanics Interdisciplinary Research Group; Singapore-MIT Alliance for Research and Technology; 3 Science Drive 2 Singapore 117543 Singapore
| | - Abdul Rahim Mohamed Sharif
- School of Chemical and Biomedical Engineering; Nanyang Technological University; 62 Nanyang Drive Singapore 637459 Singapore
| | - Shahrzad Rayatpisheh
- School of Chemical and Biomedical Engineering; Nanyang Technological University; 62 Nanyang Drive Singapore 637459 Singapore
| | - Bernice H. L. Oh
- School of Chemical and Biomedical Engineering; Nanyang Technological University; 62 Nanyang Drive Singapore 637459 Singapore
| | - Xu Rong
- School of Chemical and Biomedical Engineering; Nanyang Technological University; 62 Nanyang Drive Singapore 637459 Singapore
| | - Roger Beuerman
- Singapore Eye Research Institute; 11 Third Hospital Avenue Singapore 168751
| | - Mary B. Chan-Park
- School of Chemical and Biomedical Engineering; Nanyang Technological University; 62 Nanyang Drive Singapore 637459 Singapore
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13
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Protein deposition on contact lenses: The past, the present, and the future. Cont Lens Anterior Eye 2012; 35:53-64. [DOI: 10.1016/j.clae.2011.12.005] [Citation(s) in RCA: 119] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2010] [Revised: 12/18/2011] [Accepted: 12/24/2011] [Indexed: 11/19/2022]
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14
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Yasuda H. Preparation of amorphous carbon nanofilm by magneto-luminous polymerization. J Appl Polym Sci 2012. [DOI: 10.1002/app.36415] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Byström E, Nordborg A, Limé F, Dinh NP, Irgum K. Plasma brominated polymer particles as grafting substrate for thiol-terminated telomers. J Sep Sci 2010; 33:1563-70. [DOI: 10.1002/jssc.201000028] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Biomaterialien und Biokompatibilität. BIOMED ENG-BIOMED TE 2010. [DOI: 10.1515/bmt.2010.702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Subbaraman LN, Glasier MA, Senchyna M, Sheardown H, Jones L. Kinetics ofIn VitroLysozyme Deposition on Silicone Hydrogel, PMMA, and FDA Groups I, II, and IV Contact Lens Materials. Curr Eye Res 2009; 31:787-96. [PMID: 17050272 DOI: 10.1080/02713680600888799] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
We sought to compare the kinetics of in vitro lysozyme deposition on silicone hydrogel (SH), polymethyl methacrylate (PMMA), and FDA groups I, II, and IV contact lenses. Lenses were incubated in 125I-labeled lysozyme for time periods ranging from 1 hr to 28 days, and radioactive counts were determined. SH lenses and PMMA deposited less lysozyme than conventional hydrogel lenses (p < 0.05). Lysozyme accumulation on group IV lenses reached a maximum on the seventh day and then plateaued, whereas on groups I, II, and SH lenses, deposition continued to increase across all time periods, reiterating that kinetics of lysozyme deposition is highly material dependent.
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Affiliation(s)
- Lakshman N Subbaraman
- Centre for Contact Lens Research, School of Optometry, University of Waterloo, Waterloo, Ontario, Canada.
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Efficacy of an Extraction Solvent Used to Quantify Albumin Deposition on Hydrogel Contact Lens Materials. Eye Contact Lens 2009; 35:76-80. [DOI: 10.1097/icl.0b013e318199aff6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Su J, Iomdina E, Tarutta E, Ward B, Song J, Wildsoet CF. Effects of poly(2-hydroxyethyl methacrylate) and poly(vinyl-pyrrolidone) hydrogel implants on myopic and normal chick sclera. Exp Eye Res 2008; 88:445-57. [PMID: 19109950 DOI: 10.1016/j.exer.2008.10.029] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2008] [Revised: 10/07/2008] [Accepted: 10/23/2008] [Indexed: 10/21/2022]
Abstract
There has been generally little attention paid to the utilization of biomaterials as an anti-myopia treatment. The purpose of this study was to investigate whether polymeric hydrogels, either implanted or injected adjacent to the outer scleral surface, slow ocular elongation. White Leghorn (Gallus gallus domesticus) chicks were used at 2 weeks of age. Chicks had either (1) a strip of poly(2-hydroxyethyl methacrylate) (pHEMA) implanted monocularly against the outer sclera at the posterior pole, or (2) an in situ polymerizing gel [main ingredient: poly(vinyl-pyrrolidone) (PVP)] injected monocularly at the same location. Some of the eyes injected with the polymer were fitted with a diffuser or a -10D lens. In each experiment, ocular lengths were measured at regular intervals by high frequency A-scan ultrasonography, and chicks were sacrificed for histology at staged intervals. No in vivo signs of either orbital or ocular inflammation were observed. The pHEMA implant significantly increased scleral thickness by the third week, and the implant became encapsulated with fibrous tissue. The PVP-injected eyes left otherwise untreated, showed a significant increase in scleral thickness, due to increased chondrocyte proliferation and extracellular matrix deposition. However, there was no effect of the PVP injection on ocular elongation. In eyes wearing optical devices, there was no effect on either scleral thickness or ocular elongation. These results represent "proof of principle" that scleral growth can be manipulated without adverse inflammatory responses. However, since neither approach slowed ocular elongation, additional factors must influence scleral surface area expansion in the avian eye.
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Affiliation(s)
- James Su
- Vision Science Group, School of Optometry, UC Berkeley, Berkeley, CA 94720-2020, USA.
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Abstract
This manuscript presents hydrogels (HGs) from a tissue engineering perspective being especially written for those who are approaching this field by offering a concise but inclusive review of hydrogel synthesis, properties, characterization methods, and applications.
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Affiliation(s)
- Biancamaria Baroli
- Dipartimento Farmaco Chimico Tecnologico, Università di Cagliari, Via Ospedale, 72, 09124 Cagliari, Italy.
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Clapper JD, Guymon CA. Physical Behavior of Cross-Linked PEG Hydrogels Photopolymerized within Nanostructured Lyotropic Liquid Crystalline Templates. Macromolecules 2007. [DOI: 10.1021/ma0622377] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jason D. Clapper
- Department of Chemical and Biochemical Engineering, The University of Iowa, Iowa City, Iowa 52242
| | - C. Allan Guymon
- Department of Chemical and Biochemical Engineering, The University of Iowa, Iowa City, Iowa 52242
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