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Fletcher GK, Nash LD, Graul LM, Jang LK, Herting SM, Wilcox MD, Touchet TJ, Sweatt AK, McDougall MP, Wright SM, Maitland DJ. Chemical Modifications of Porous Shape Memory Polymers for Enhanced X-ray and MRI Visibility. Molecules 2020; 25:E4660. [PMID: 33066091 PMCID: PMC7587375 DOI: 10.3390/molecules25204660] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 10/07/2020] [Accepted: 10/12/2020] [Indexed: 12/02/2022] Open
Abstract
The goal of this work was to develop a shape memory polymer (SMP) foam with visibility under both X-ray and magnetic resonance imaging (MRI) modalities. A porous polymeric material with these properties is desirable in medical device development for applications requiring thermoresponsive tissue scaffolds with clinical imaging capabilities. Dual modality visibility was achieved by chemically incorporating monomers with X-ray visible iodine-motifs and MRI visible monomers with gadolinium content. Physical and thermomechanical characterization showed the effect of increased gadopentetic acid (GPA) on shape memory behavior. Multiple compositions showed brightening effects in pilot, T1-weighted MR imaging. There was a correlation between the polymeric density and X-ray visibility on expanded and compressed SMP foams. Additionally, extractions and indirect cytocompatibility studies were performed to address toxicity concerns of gadolinium-based contrast agents (GBCAs). This material platform has the potential to be used in a variety of medical devices.
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Affiliation(s)
- Grace K. Fletcher
- Texas A&M University Biomedical Engineering, Bizzell St, College Station, TX 77843, USA; (G.K.F.); (L.M.G.); (L.K.J.); (S.M.H.); (M.D.W.); (T.J.T.); (A.K.S.); (M.P.M.); (S.M.W.)
| | | | - Lance M. Graul
- Texas A&M University Biomedical Engineering, Bizzell St, College Station, TX 77843, USA; (G.K.F.); (L.M.G.); (L.K.J.); (S.M.H.); (M.D.W.); (T.J.T.); (A.K.S.); (M.P.M.); (S.M.W.)
| | - Lindy K. Jang
- Texas A&M University Biomedical Engineering, Bizzell St, College Station, TX 77843, USA; (G.K.F.); (L.M.G.); (L.K.J.); (S.M.H.); (M.D.W.); (T.J.T.); (A.K.S.); (M.P.M.); (S.M.W.)
| | - Scott M. Herting
- Texas A&M University Biomedical Engineering, Bizzell St, College Station, TX 77843, USA; (G.K.F.); (L.M.G.); (L.K.J.); (S.M.H.); (M.D.W.); (T.J.T.); (A.K.S.); (M.P.M.); (S.M.W.)
| | - Matthew D. Wilcox
- Texas A&M University Biomedical Engineering, Bizzell St, College Station, TX 77843, USA; (G.K.F.); (L.M.G.); (L.K.J.); (S.M.H.); (M.D.W.); (T.J.T.); (A.K.S.); (M.P.M.); (S.M.W.)
| | - Tyler J. Touchet
- Texas A&M University Biomedical Engineering, Bizzell St, College Station, TX 77843, USA; (G.K.F.); (L.M.G.); (L.K.J.); (S.M.H.); (M.D.W.); (T.J.T.); (A.K.S.); (M.P.M.); (S.M.W.)
| | - Ana Katarina Sweatt
- Texas A&M University Biomedical Engineering, Bizzell St, College Station, TX 77843, USA; (G.K.F.); (L.M.G.); (L.K.J.); (S.M.H.); (M.D.W.); (T.J.T.); (A.K.S.); (M.P.M.); (S.M.W.)
| | - Mary P. McDougall
- Texas A&M University Biomedical Engineering, Bizzell St, College Station, TX 77843, USA; (G.K.F.); (L.M.G.); (L.K.J.); (S.M.H.); (M.D.W.); (T.J.T.); (A.K.S.); (M.P.M.); (S.M.W.)
- Texas A&M University Electrical and Computer Engineering, Bizzell St, College Station, TX 77843, USA
| | - Steven M. Wright
- Texas A&M University Biomedical Engineering, Bizzell St, College Station, TX 77843, USA; (G.K.F.); (L.M.G.); (L.K.J.); (S.M.H.); (M.D.W.); (T.J.T.); (A.K.S.); (M.P.M.); (S.M.W.)
- Texas A&M University Electrical and Computer Engineering, Bizzell St, College Station, TX 77843, USA
| | - Duncan J. Maitland
- Texas A&M University Biomedical Engineering, Bizzell St, College Station, TX 77843, USA; (G.K.F.); (L.M.G.); (L.K.J.); (S.M.H.); (M.D.W.); (T.J.T.); (A.K.S.); (M.P.M.); (S.M.W.)
- Shape Memory Medical Inc., Santa Clara, CA 95054, USA;
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Shape Memory Polymer Foams Synthesized Using Glycerol and Hexanetriol for Enhanced Degradation Resistance. Polymers (Basel) 2020; 12:polym12102290. [PMID: 33036235 PMCID: PMC7600845 DOI: 10.3390/polym12102290] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 10/01/2020] [Accepted: 10/05/2020] [Indexed: 01/21/2023] Open
Abstract
Shape memory polymer foams have been used in a wide range of medical applications, including, but not limited to, vessel occlusion and aneurysm treatment. This unique polymer system has been proven to shape-fill a void, which makes it useful for occlusion applications. While the shape memory polymer foam has superior performance and healing outcomes compared to its leading competitors, some device applications may benefit from longer material degradation times, or degradation-resistant formulations with increased fibrous encapsulation. In this study, biostable shape memory polymer foams were synthesized, and their physical and chemical properties were characterized as an initial evaluation of feasibility for vascular occlusion applications. After characterizing their shape memory behavior in an aqueous environment, degradation of this polymer system was studied in vitro using accelerated oxidative and hydrolytic solutions. Results indicated that the foams did not lose mass under oxidative or hydrolytic conditions, and they maintained high shape recovery in aqueous in vitro models. These degradation-resistant systems have potential for use in vascular occlusion and other wound healing applications that benefit from permanent, space-filling shape memory behavior.
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Sun L, Gao X, Wu D, Guo Q. Advances in Physiologically Relevant Actuation of Shape Memory Polymers for Biomedical Applications. POLYM REV 2020. [DOI: 10.1080/15583724.2020.1825487] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Luyao Sun
- Department of Biomedical Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, China
| | - Xu Gao
- Department of Biomedical Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, China
| | - Decheng Wu
- Department of Biomedical Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, China
| | - Qiongyu Guo
- Department of Biomedical Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, China
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Xiao R, Huang WM. Heating/Solvent Responsive Shape-Memory Polymers for Implant Biomedical Devices in Minimally Invasive Surgery: Current Status and Challenge. Macromol Biosci 2020; 20:e2000108. [PMID: 32567193 DOI: 10.1002/mabi.202000108] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Revised: 05/03/2020] [Indexed: 12/16/2022]
Abstract
This review is about the fundamentals and practical issues in applying both heating and solvent responsive shape memory polymers (SMPs) for implant biomedical devices via minimally invasive surgery. After revealing the general requirements in the design of biomedical devices based on SMPs and the fundamentals for the shape-memory effect in SMPs, the underlying mechanisms, characterization methods, and several representative biomedical applications, including vascular stents, tissue scaffolds, occlusion devices, drug delivery systems, and the current R&D status of them, are discussed. The new opportunities arising from emerging technologies, such as 3D printing, and new materials, such as vitrimer, are also highlighted. Finally, the major challenge that limits the practical clinical applications of SMPs at present is addressed.
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Affiliation(s)
- Rui Xiao
- Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province, Department of Engineering Mechanics, Zhejiang University, Hangzhou, 310027, China
| | - Wei Min Huang
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
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Wang CY, Hu J, Sheth RA, Oklu R. Emerging Embolic Agents in Endovascular Embolization: An Overview. PROGRESS IN BIOMEDICAL ENGINEERING (BRISTOL, ENGLAND) 2020; 2:012003. [PMID: 34553126 PMCID: PMC8455112 DOI: 10.1088/2516-1091/ab6c7d] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Courtney Y. Wang
- The University of Texas Health Science Center at Houston, McGovern Medical School, 6431 Fannin St., Hourson, TX 77030, USA
| | - Jingjie Hu
- Division of Vascular and Interventional Radiology, Minimally Invasive Therapeutics Laboratory, Mayo Clinic, 13400 East Shea Blvd., Scottsdale, AZ 85259, USA
| | - Rahul A. Sheth
- Department of Interventional Radiology, The University of Texas MD Anderson Cancer Center, Houston, TX 77054, USA
| | - Rahmi Oklu
- Division of Vascular and Interventional Radiology, Minimally Invasive Therapeutics Laboratory, Mayo Clinic, 13400 East Shea Blvd., Scottsdale, AZ 85259, USA
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Hu J, Albadawi H, Oklu R, Chong BW, Deipolyi AR, Sheth RA, Khademhosseini A. Advances in Biomaterials and Technologies for Vascular Embolization. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1901071. [PMID: 31168915 PMCID: PMC7014563 DOI: 10.1002/adma.201901071] [Citation(s) in RCA: 98] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Revised: 03/24/2019] [Indexed: 05/03/2023]
Abstract
Minimally invasive transcatheter embolization is a common nonsurgical procedure in interventional radiology used for the deliberate occlusion of blood vessels for the treatment of diseased or injured vasculature. A wide variety of embolic agents including metallic coils, calibrated microspheres, and liquids are available for clinical practice. Additionally, advances in biomaterials, such as shape-memory foams, biodegradable polymers, and in situ gelling solutions have led to the development of novel preclinical embolic agents. The aim here is to provide a comprehensive overview of current and emerging technologies in endovascular embolization with respect to devices, materials, mechanisms, and design guidelines. Limitations and challenges in embolic materials are also discussed to promote advancement in the field.
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Affiliation(s)
- Jingjie Hu
- Division of Vascular & Interventional Radiology, Minimally Invasive Therapeutics Laboratory, Mayo Clinic, 13400 East Shea Blvd., Scottsdale, Arizona 85259, USA
| | - Hassan Albadawi
- Division of Vascular & Interventional Radiology, Minimally Invasive Therapeutics Laboratory, Mayo Clinic, 13400 East Shea Blvd., Scottsdale, Arizona 85259, USA
| | - Rahmi Oklu
- Division of Vascular & Interventional Radiology, Minimally Invasive Therapeutics Laboratory, Mayo Clinic, 13400 East Shea Blvd., Scottsdale, Arizona 85259, USA
| | - Brian W Chong
- Departments of Radiology and Neurological Surgery, Mayo Clinic, 13400 East Shea Blvd., Scottsdale, Arizona 85259, USA
| | - Amy R. Deipolyi
- Department of Interventional Radiology, Memorial Sloan Kettering Cancer Center, Weill Cornell Medical Center, 1275 York Avenue, New York, New York 10065, USA
| | - Rahul A. Sheth
- Department of Interventional Radiology, The University of Texas MD Anderson Cancer Center, Houston, Texas 77054, USA
| | - Ali Khademhosseini
- Department of Bioengineering, Department of Radiological Sciences, Department of Chemical and Biomolecular Engineering, Center for Minimally Invasive Therapeutics, California Nanosystems Institute, University of California, 410 Westwood Plaza, Los Angeles, California 90095, USA
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Monroe MBB, Easley AD, Grant K, Fletcher GK, Boyer C, Maitland DJ. Multifunctional Shape-Memory Polymer Foams with Bio-inspired Antimicrobials. Chemphyschem 2017; 19:1999-2008. [PMID: 29282877 DOI: 10.1002/cphc.201701015] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Indexed: 11/09/2022]
Abstract
Despite a number of clinically available hemostats, uncontrolled bleeding is the primary cause of trauma-related death. Shape-memory polymer (SMP) foams have a number of desirable properties for use as hemostats, including shape recovery to enable delivery into bleed sites, biocompatibility, and rapid blood clotting. To expand upon this material system, the current work aims to incorporate phenolic acids, which are honey-based antimicrobial agents, into SMP foams. We showed that cinnamic acid (CA) can be utilized as a monomer in SMP synthesis to provide foams with comparable pore structure and retained cytocompatibility. The addition of CA enabled tuning of thermal and shape-memory properties within clinically relevant ranges. Furthermore, the modified foams demonstrated initial and sustained antimicrobial effects against gram-positive and gram-negative bacteria. These multifunctional scaffolds demonstrate potential for use as hemostats to improve upon current hemorrhage treatments and provide a new tool in tuning the biological and material properties of SMP foams.
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Affiliation(s)
- Mary Beth Browning Monroe
- Department of Biomedical Engineering, Texas A&M University, 5045 Emerging Technologies Building, 3120 TAMU, College Station, TX, 77843-3120, USA
| | - Alexandra D Easley
- Department of Biomedical Engineering, Texas A&M University, 5045 Emerging Technologies Building, 3120 TAMU, College Station, TX, 77843-3120, USA
| | - Katie Grant
- Department of Biomedical Engineering, Texas A&M University, 5045 Emerging Technologies Building, 3120 TAMU, College Station, TX, 77843-3120, USA
| | - Grace K Fletcher
- Department of Biomedical Engineering, Texas A&M University, 5045 Emerging Technologies Building, 3120 TAMU, College Station, TX, 77843-3120, USA
| | - Calla Boyer
- Department of Biomedical Engineering, Texas A&M University, 5045 Emerging Technologies Building, 3120 TAMU, College Station, TX, 77843-3120, USA
| | - Duncan J Maitland
- Department of Biomedical Engineering, Texas A&M University, 5045 Emerging Technologies Building, 3120 TAMU, College Station, TX, 77843-3120, USA
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