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Zhou M, Young BK, Valle ED, Koo B, Kim J, Weiland JD. Full-field, conformal epiretinal electrode array using hydrogel and polymer hybrid technology. Sci Rep 2023; 13:6973. [PMID: 37117214 PMCID: PMC10147691 DOI: 10.1038/s41598-023-32976-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Accepted: 04/05/2023] [Indexed: 04/30/2023] Open
Abstract
Shape-morphable electrode arrays can form 3D surfaces to conform to complex neural anatomy and provide consistent positioning needed for next-generation neural interfaces. Retinal prostheses need a curved interface to match the spherical eye and a coverage of several cm to restore peripheral vision. We fabricated a full-field array that can (1) cover a visual field of 57° based on electrode position and of 113° based on the substrate size; (2) fold to form a compact shape for implantation; (3) self-deploy into a curvature fitting the eye after implantation. The full-field array consists of multiple polymer layers, specifically, a sandwich structure of elastomer/polyimide-based-electrode/elastomer, coated on one side with hydrogel. Electrodeposition of high-surface-area platinum/iridium alloy significantly improved the electrical properties of the electrodes. Hydrogel over-coating reduced electrode performance, but the electrodes retained better properties than those without platinum/iridium. The full-field array was rolled into a compact shape and, once implanted into ex vivo pig eyes, restored to a 3D curved surface. The full-field retinal array provides significant coverage of the retina while allowing surgical implantation through an incision 33% of the final device diameter. The shape-changing material platform can be used with other neural interfaces that require conformability to complex neuroanatomy.
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Affiliation(s)
- Muru Zhou
- Macromolecular Science and Engineering Program, University of Michigan, Ann Arbor, 48105, USA
| | - Benjamin K Young
- Department of Ophthalmology, Oregon Health and Sciences University, Portland, OR, 97239, USA
| | - Elena Della Valle
- Biomedical Engineering, University of Michigan, Ann Arbor, 48105, USA
| | - Beomseo Koo
- Biomedical Engineering, University of Michigan, Ann Arbor, 48105, USA
| | - Jinsang Kim
- Macromolecular Science and Engineering Program, University of Michigan, Ann Arbor, 48105, USA
- Biomedical Engineering, University of Michigan, Ann Arbor, 48105, USA
- Chemical Engineering, University of Michigan, Ann Arbor, 48105, USA
- Materials Science and Engineering, University of Michigan, Ann Arbor, 48105, USA
- Chemistry, University of Michigan, Ann Arbor, 48105, USA
- Biointerfaces Institute, University of Michigan, Ann Arbor, 48105, USA
| | - James D Weiland
- Biomedical Engineering, University of Michigan, Ann Arbor, 48105, USA.
- Biointerfaces Institute, University of Michigan, Ann Arbor, 48105, USA.
- Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, 48105, USA.
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2
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Bioresorbable Chitosan-Based Bone Regeneration Scaffold Using Various Bioceramics and the Alteration of Photoinitiator Concentration in an Extended UV Photocrosslinking Reaction. Gels 2022; 8:gels8110696. [DOI: 10.3390/gels8110696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2022] [Revised: 10/19/2022] [Accepted: 10/25/2022] [Indexed: 11/16/2022] Open
Abstract
Bone tissue engineering (BTE) is an ongoing field of research based on clinical needs to treat delayed and non-union long bone fractures. An ideal tissue engineering scaffold should have a biodegradability property matching the rate of new bone turnover, be non-toxic, have good mechanical properties, and mimic the natural extracellular matrix to induce bone regeneration. In this study, biodegradable chitosan (CS) scaffolds were prepared with combinations of bioactive ceramics, namely hydroxyapatite (HAp), tricalcium phosphate-α (TCP- α), and fluorapatite (FAp), with a fixed concentration of benzophenone photoinitiator (50 µL of 0.1% (w/v)) and crosslinked using a UV curing system. The efficacy of the one-step crosslinking reaction was assessed using swelling and compression testing, SEM and FTIR analysis, and biodegradation studies in simulated body fluid. Results indicate that the scaffolds had comparable mechanical properties, which were: 13.69 ± 1.06 (CS/HAp), 12.82 ± 4.10 (CS/TCP-α), 13.87 ± 2.9 (CS/HAp/TCP-α), and 15.55 ± 0.56 (CS/FAp). Consequently, various benzophenone concentrations were added to CS/HAp formulations to determine their effect on the degradation rate. Based on the mechanical properties and degradation profile of CS/HAp, it was found that 5 µL of 0.1% (w/v) benzophenone resulted in the highest degradation rate at eight weeks (54.48% degraded), while maintaining compressive strength between (4.04 ± 1.49 to 10.17 ± 4.78 MPa) during degradation testing. These results indicate that incorporating bioceramics with a suitable photoinitiator concentration can tailor the biodegradability and load-bearing capacity of the scaffolds.
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3
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Hybrid polymer networks of carbene and thiol ene. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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4
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Gencoglu T, Eren TN, Lalevée J, Avci D. A Water Soluble, Low Migration and Visible Light Photoinitiator by Thioxanthone‐Functionalization of Poly(ethylene glycol)‐Containing Poly(
β
‐amino ester). MACROMOL CHEM PHYS 2022. [DOI: 10.1002/macp.202100450] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Turkan Gencoglu
- Department of Chemistry Bogazici University Bebek Istanbul 34342 Turkey
| | - Tugce Nur Eren
- Department of Chemistry Bogazici University Bebek Istanbul 34342 Turkey
| | - Jacques Lalevée
- Institut de Science des Matériaux de Mulhouse IS2M UMR CNRS 7361 UHA 15 rue Jean Starcky Mulhouse Cedex 68057 France
| | - Duygu Avci
- Department of Chemistry Bogazici University Bebek Istanbul 34342 Turkey
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5
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Balaban B, Kariksiz N, Eren TN, Avci D. Cyclopolymerizable and cyclopolymeric photoinitiators from diallyl amine and α-hydroxy ketones. Polym Chem 2022. [DOI: 10.1039/d2py00688j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two novel cyclopolymerizable and one cyclopolymeric (first in the literature) PIs with high reactivity, controllable water solubility, migration stability and high thermal stability were synthesized by attachment of diallyl amine to I2959 or I184.
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Affiliation(s)
- Burcu Balaban
- Department of Chemistry, Bogazici University, 34342 Bebek, Istanbul, Turkey
| | - Neslihan Kariksiz
- Department of Chemistry, Bogazici University, 34342 Bebek, Istanbul, Turkey
| | - Tugce Nur Eren
- Department of Chemistry, Bogazici University, 34342 Bebek, Istanbul, Turkey
| | - Duygu Avci
- Department of Chemistry, Bogazici University, 34342 Bebek, Istanbul, Turkey
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6
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Balcerak A, Kwiatkowska D, Kabatc J. Novel photoinitiators based on difluoroborate complexes of squaraine dyes for radical polymerization of acrylates upon visible light. Polym Chem 2022. [DOI: 10.1039/d1py01294k] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The present article describes the efficiency of novel two-component photoinitiators based on a typical squaraine dye and its difluoroborate analogues for the radical polymerization of acrylate monomers.
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Affiliation(s)
- Alicja Balcerak
- Bydgoszcz University of Science and Technology, Faculty of Chemical Technology and Engineering, Department of Organic Chemistry, Seminaryjna 3, 85-326 Bydgoszcz, Poland
| | - Dominika Kwiatkowska
- Bydgoszcz University of Science and Technology, Faculty of Chemical Technology and Engineering, Department of Organic Chemistry, Seminaryjna 3, 85-326 Bydgoszcz, Poland
| | - Janina Kabatc
- Bydgoszcz University of Science and Technology, Faculty of Chemical Technology and Engineering, Department of Organic Chemistry, Seminaryjna 3, 85-326 Bydgoszcz, Poland
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7
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Wang J, Zhang Y, Aghda NH, Pillai AR, Thakkar R, Nokhodchi A, Maniruzzaman M. Emerging 3D printing technologies for drug delivery devices: Current status and future perspective. Adv Drug Deliv Rev 2021; 174:294-316. [PMID: 33895212 DOI: 10.1016/j.addr.2021.04.019] [Citation(s) in RCA: 68] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 03/26/2021] [Accepted: 04/19/2021] [Indexed: 12/13/2022]
Abstract
The 'one-size-fits-all' approach followed by conventional drug delivery platforms often restricts its application in pharmaceutical industry, due to the incapability of adapting to individual pharmacokinetic traits. Driven by the development of additive manufacturing (AM) technology, three-dimensional (3D) printed drug delivery medical devices have gained increasing popularity, which offers key advantages over traditional drug delivery systems. The major benefits include the ability to fabricate 3D structures with customizable design and intricate architecture, and most importantly, ease of personalized medication. Furthermore, the emergence of multi-material printing and four-dimensional (4D) printing integrates the benefits of multiple functional materials, and thus provide widespread opportunities for the advancement of personalized drug delivery devices. Despite the remarkable progress made by AM techniques, concerns related to regulatory issues, scalability and cost-effectiveness remain major hurdles. Herein, we provide an overview on the latest accomplishments in 3D printed drug delivery devices as well as major challenges and future perspectives for AM enabled dosage forms and drug delivery systems.
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Affiliation(s)
- Jiawei Wang
- Pharmaceutical Engineering and 3D Printing (PharmE3D) Lab, College of Pharmacy, The University of Texas at Austin, 2409 University Avenue, A1920, Austin, TX 78712, USA
| | - Yu Zhang
- Pharmaceutical Engineering and 3D Printing (PharmE3D) Lab, College of Pharmacy, The University of Texas at Austin, 2409 University Avenue, A1920, Austin, TX 78712, USA
| | - Niloofar Heshmati Aghda
- Pharmaceutical Engineering and 3D Printing (PharmE3D) Lab, College of Pharmacy, The University of Texas at Austin, 2409 University Avenue, A1920, Austin, TX 78712, USA
| | - Amit Raviraj Pillai
- Pharmaceutical Engineering and 3D Printing (PharmE3D) Lab, College of Pharmacy, The University of Texas at Austin, 2409 University Avenue, A1920, Austin, TX 78712, USA
| | - Rishi Thakkar
- Pharmaceutical Engineering and 3D Printing (PharmE3D) Lab, College of Pharmacy, The University of Texas at Austin, 2409 University Avenue, A1920, Austin, TX 78712, USA
| | - Ali Nokhodchi
- Pharmaceutics Research Laboratory, School of Life Sciences, University of Sussex, Brighton BN1 9QJ, UK
| | - Mohammed Maniruzzaman
- Pharmaceutical Engineering and 3D Printing (PharmE3D) Lab, College of Pharmacy, The University of Texas at Austin, 2409 University Avenue, A1920, Austin, TX 78712, USA.
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Hevus I, Webster DC, McNamara J, Ricapito NG, Tymoshenko S. Parallel esterification of bio‐based dicarboxylic acids in small scale film reactors: A
h
igh‐
t
hroughput
study. JOURNAL OF POLYMER SCIENCE 2021. [DOI: 10.1002/pol.20210059] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Ivan Hevus
- Department of Coatings and Polymeric Materials North Dakota State University Fargo North Dakota USA
| | - Dean C. Webster
- Department of Coatings and Polymeric Materials North Dakota State University Fargo North Dakota USA
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Abstract
3D printing (also called "additive manufacturing" or "rapid prototyping") is able to translate computer-aided and designed virtual 3D models into 3D tangible constructs/objects through a layer-by-layer deposition approach. Since its introduction, 3D printing has aroused enormous interest among researchers and engineers to understand the fabrication process and composition-structure-property correlation of printed 3D objects and unleash its great potential for application in a variety of industrial sectors. Because of its unique technological advantages, 3D printing can definitely benefit the field of microrobotics and advance the design and development of functional microrobots in a customized manner. This review aims to present a generic overview of 3D printing for functional microrobots. The most applicable 3D printing techniques, with a focus on laser-based printing, are introduced for the 3D microfabrication of microrobots. 3D-printable materials for fabricating microrobots are reviewed in detail, including photopolymers, photo-crosslinkable hydrogels, and cell-laden hydrogels. The representative applications of 3D-printed microrobots with rational designs heretofore give evidence of how these printed microrobots are being exploited in the medical, environmental, and other relevant fields. A future outlook on the 3D printing of microrobots is also provided.
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Affiliation(s)
- Jinhua Li
- Center for Advanced Functional Nanorobots, Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technická 5, Prague 6, 16628, Czech Republic.
| | - Martin Pumera
- Center for Advanced Functional Nanorobots, Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technická 5, Prague 6, 16628, Czech Republic. and Future Energy and Innovation Laboratory, Central European Institute of Technology, Brno University of Technology, Purkyňova 656/123, Brno, CZ-61600, Czech Republic and Department of Chemistry and Biochemistry, Mendel University in Brno, Zemedelska 1, CZ-613 00, Brno, Czech Republic and Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea
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10
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Bretherton RC, DeForest CA. The Art of Engineering Biomimetic Cellular Microenvironments. ACS Biomater Sci Eng 2021; 7:3997-4008. [PMID: 33523625 DOI: 10.1021/acsbiomaterials.0c01549] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cells and their surrounding microenvironment exist in dynamic reciprocity, where bidirectional feedback and feedforward crosstalk drives essential processes in development, homeostasis, and disease. With the ongoing explosion of customizable biomaterial innovation for dynamic cell culture, an ever-expanding suite of user-programmable scaffolds now exists to probe cell fate in response to spatiotemporally controlled biophysical and biochemical cues. Here, we highlight emerging trends in these efforts, emphasizing strategies that offer tunability over complex network mechanics, present biomolecular cues anisotropically, and harness cells as physiochemical actuators of the pericellular niche. Altogether, these material advances will lead to breakthroughs in our basic understanding of how cells interact with, integrate signals from, and influence their surrounding microenvironment.
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Affiliation(s)
- Ross C Bretherton
- Department of Bioengineering, University of Washington, Seattle, Washington 98105, United States.,Institute of Stem Cell & Regenerative Medicine, University of Washington, Seattle, Washington 98109, United States
| | - Cole A DeForest
- Department of Bioengineering, University of Washington, Seattle, Washington 98105, United States.,Institute of Stem Cell & Regenerative Medicine, University of Washington, Seattle, Washington 98109, United States.,Department of Chemical Engineering, University of Washington, Seattle, Washington 98195, United States.,Department of Chemistry, University of Washington, Seattle, Washington 98195, United States.,Molecular Engineering & Sciences Institute, University of Washington, Seattle, Washington 98195, United States
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11
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Nieto D, Marchal Corrales JA, Jorge de Mora A, Moroni L. Fundamentals of light-cell-polymer interactions in photo-cross-linking based bioprinting. APL Bioeng 2020; 4:041502. [PMID: 33094212 PMCID: PMC7553782 DOI: 10.1063/5.0022693] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Accepted: 09/21/2020] [Indexed: 02/06/2023] Open
Abstract
Biofabrication technologies that use light for polymerization of biomaterials have made
significant progress in the quality, resolution, and generation of precise complex tissue
structures. In recent years, the evolution of these technologies has been growing along
with the development of new photocurable resins and photoinitiators that are biocompatible
and biodegradable with bioactive properties. Such evolution has allowed the progress of a
large number of tissue engineering applications. Flexibility in the design, scale, and
resolution and wide applicability of technologies are strongly dependent on the
understanding of the biophysics involved in the biofabrication process. In particular,
understanding cell–light interactions is crucial when bioprinting using cell-laden
biomaterials. Here, we summarize some theoretical mechanisms, which condition cell
response during bioprinting using light based technologies. We take a brief look at the
light–biomaterial interaction for a better understanding of how linear effects
(refraction, reflection, absorption, emission, and scattering) and nonlinear effects
(two-photon absorption) influence the biofabricated tissue structures and identify the
different parameters essential for maintaining cell viability during and after
bioprinting.
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Affiliation(s)
| | | | - Alberto Jorge de Mora
- SERGAS (Galician Health Service) and IDIS (Health Research Institute of Santiago de Compostela (IDIS), Orthopaedic Department, Universidad de Santiago de Compostela, Santiago de Compostela 15782, Spain
| | - Lorenzo Moroni
- Complex Tissue Regeneration Department, MERLN Institute for Technology Inspired Regenerative Medicine, Universiteitssingel 40, 6229ER Maastricht, The Netherlands
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Free Radical Photopolymerization and 3D Printing Using Newly Developed Dyes: Indane-1,3-Dione and 1H-Cyclopentanaphthalene-1,3-Dione Derivatives as Photoinitiators in Three-Component Systems. Catalysts 2020. [DOI: 10.3390/catal10040463] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The design of photoinitiating systems with excellent photochemical reactivities at 405nm LED is one of the obstacles to efficiently promote free radical polymerization in mild conditions (e.g., low light intensity, under air). Here, our actual search for new multicomponent photoinitiating systems at 405nm LED prompts us to develop new dyes based on push–pull structures. In the present paper, we chose two series of new dyes which possess indane-1,3-dione and 1H-cyclopenta naphthalene-1,3-dione groups as the electron-withdrawing groups, since they have the great potential to behave as sensitive and remarkable photoinitiators in vat photopolymerization/3D printing. When incorporated with a tertiary amine (ethyl dimethylaminobenzoate EDB, used as electron/hydrogen donor) and an iodonium salt (used as electron acceptor) as the three-component photoinitiating systems (PISs), and among a series of 21 dyes, 10 of them could efficiently promote the free radical photopolymerization of acrylates. Interestingly, steady state photolysis experiments revealed different behaviors of the dyes. Fluorescence experiments and free energy change calculations for redox processes were also carried out to investigate the relevant chemical mechanisms. Additionally, the formation of radicals from the investigated PISs was clearly observed by electron spin resonance (ESR) spin-trapping experiments. Finally, stereoscopic 3D patterns were successfully fabricated by the laser writing technique. In this work, the use of push–pull dyes based on the naphthalene scaffold as photoinitiators of polymerization is reported for the first time in a systematic study aiming at investigating the structure–performance relationship for irradiation carried out at 405 nm. By carefully selecting the electron donors used in the two series of push–pull dyes, novel and high-performance photoinitiating systems operating at 405 nm are thus proposed.
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