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Bioabsorbable polymer

Myung Hun Kim, Woojune Hur, Goeun Choi, Hye Sook Min, Tae Hyun Choi, Young Bin Choy, Jin-Ho Choy
A bioabsorbable polymeric bone plate enabled with both diagnostic and therapeutic functionalities (radiopacity and sustained drug release, respectively) is proposed. To this end, a drug-inorganic nanohybrid (RS-LDH) is examined as a theranostic agent by intercalating an anti-resorptive bone remodeling drug, risedronate (RS) into a layered double hydroxide (LDH) via an ion-exchange reaction. The RS-LDH is prepared as a sheet with a biodegradable polymer, poly(lactic-co-glycolic acid), and is then attached onto the clinically approved bioabsorbable bone plate to produce the theranostic plate...
October 10, 2016: Advanced Healthcare Materials
Luanda Chaves Lins, Florence Wianny, Sébastien Livi, Idalba Andreina Hidalgo, Colette Dehay, Jannick Duchet-Rumeau, Jean-François Gérard
In this study, electrospun fiber scaffolds based on biodegradable and bioabsorbable polymers and showing a similar structure to that of the extracellular matrix (ECM) present in the neural tissues were prepared. The effects of electrospun-based scaffolds processed from poly(lactic acid) (PLA)/poly(lactide-b-ethylene glycol-b-lactide) block copolymer (PELA) and PLA/polyethylene glycol (PEG) (50:50 by wt) blends on the morphology, wettability, and mechanical properties, as well as on neural stem cell (NSC) behavior, were investigated...
October 10, 2016: Biomacromolecules
Pallavi Bhambri, Ali Sarvi, John H Wong, Uttandaraman Sundararaj, Alim P Mitha
OBJECTIVE: The only pharmacologic prophylaxis for cerebral vasospasm after subarachnoid hemorrhage is oral nimodipine. A novel way to mitigate this risk may be to design a drug eluting stent that elutes verapamil over the time period typically associated with vasospasm. In this study, we explore different methods of coating nitinol stents with a bioabsorbable polymer and determine the release profile of various verapamil coated stents for the potential treatment of vasospasm. METHODS: Nitinol stents were coated with different concentrations of poly(lactic acid-co-glycolic acid) (PLGA) in chloroform solution and using three coating techniques: dip coating, spin coating, and electrospinning...
July 29, 2016: Journal of Neurointerventional Surgery
Dhaval Kolte, J Dawn Abbott
Long-term outcomes were similar in patients treated with first- or second-generation drug-eluting stents (DES) for saphenous vein graft (SVG) lesions. Patients presenting with acute myocardial infarction as a result of occluded SVG may derive some benefit from the use of second- versus first-generation DES Randomized clinical trials are needed to determine whether newer DES types including those with bioabsorbable polymer or scaffolds offer a distinct advantage in the treatment of SVG lesions.
January 1, 2016: Catheterization and Cardiovascular Interventions
Javier Escaned, Adrian Banning, Vasim Farooq, Mauro Echavarria-Pinto, Yoshinobu Onuma, Nicola Ryan, Rafael Cavalcante, Carlos M Campos, Bojan M Stanetic, Yuki Ishibashi, Pannipa Suwannasom, Arie-Pieter Kappetein, David Taggart, Marie-Angèle Morel, Gerrit-Anne van Es, Patrick W Serruys
AIMS: The applicability of the results of the SYNTAX trial comparing percutaneous coronary intervention (PCI) using first-generation drug-eluting stents (DES) with coronary artery bypass graft (CABG) surgery for the treatment of patients with complex coronary artery disease (CAD) has been challenged by recent major technical and procedural developments in coronary revascularisation. Functional assessment of coronary lesions has contributed to marked improvements in both safety and efficacy of DES implantation...
June 12, 2016: EuroIntervention
Claire McCune, Peter McKavanagh, Ian B A Menown
INTRODUCTION: Multiple significant, potentially practice changing clinical trials in cardiology have been conducted and subsequently presented throughout the past year. METHODS: In this paper, the authors have reviewed and contextualized significant cardiovascular clinical trials presented at major international conferences of 2015 including American College of Cardiology, European Association for Percutaneous Cardiovascular Interventions, American Diabetes Association, European Society of Cardiology, Transcatheter Cardiovascular Therapeutics, Heart Rhythm Congress, and the American Heart Association Scientific Sessions...
June 8, 2016: Cardiology and Therapy
James B McCLAIN, Wenda C Carlyle, Dennis J Donohoe, John A Ormiston
Drug-eluting stents (DES) have dramatically improved the long-term efficacy of percutaneous coronary intervention (PCI). Over the last decade there have been numerous advances in DES platforms, however, all but one currently approved DES in the United States and many of the approved DES worldwide still have 3 common features: a metal stent platform, an anti-proliferative drug, and a permanent polymer. In this context, the polymer is critical to control drug release, but the polymer serves no purpose after the drug is eluted...
October 2016: Minerva Cardioangiologica
Kensuke Nishimiya, Yasuharu Matsumoto, Hironori Uzuka, Tsuyoshi Ogata, Michinori Hirano, Tomohiko Shindo, Yuhi Hasebe, Ryuji Tsuburaya, Takashi Shiroto, Jun Takahashi, Kenta Ito, Hiroaki Shimokawa
OBJECTIVES: The aim of this study was to examine which component of drug-eluting stents (DES) plays a major role in enhanced coronary vasoconstricting responses after DES implantation in pigs. BACKGROUND: Recent studies have reported unremitting angina due to vasomotion abnormalities even after successful DES implantation. However, it remains to be elucidated which component of DES (metal stent, polymer coating, or antiproliferative drug) is responsible for DES-induced coronary hyperconstricting responses...
February 8, 2016: JACC. Cardiovascular Interventions
Sedat Nizamoglu, Malte C Gather, Matjaž Humar, Myunghwan Choi, Seonghoon Kim, Ki Su Kim, Sei Kwang Hahn, Giuliano Scarcelli, Mark Randolph, Robert W Redmond, Seok Hyun Yun
Advances in photonics have stimulated significant progress in medicine, with many techniques now in routine clinical use. However, the finite depth of light penetration in tissue is a serious constraint to clinical utility. Here we show implantable light-delivery devices made of bio-derived or biocompatible, and biodegradable polymers. In contrast to conventional optical fibres, which must be removed from the body soon after use, the biodegradable and biocompatible waveguides may be used for long-term light delivery and need not be removed as they are gradually resorbed by the tissue...
2016: Nature Communications
Alexandra J Lansky, Adnan Kastrati, Elazer R Edelman, Helen Parise, Vivian G Ng, John Ormiston, William Wijns, Robert A Byrne
We compared the outcomes of a novel, thin-strut, cobalt-chromium, absorbable, polymer sirolimus-eluting stent (APSES; MiStent) to the durable polymer cobalt-chromium everolimus-eluting stent (EES; Xience). A propensity-matched analysis was performed comparing data from the DES With Sirolimus and a Bioabsorbable Polymer for the Treatment of Patients With De Novo Lesions in the Native Coronary Arteries (DESSOLVE) I and II studies, evaluating the APSES to the EES arm of the Intracoronary Stenting and Angiographic Results: Test Efficacy of 3 Limus-Eluting Stents-4 study...
February 15, 2016: American Journal of Cardiology
Woojune Hur, Min Park, Jae Yeon Lee, Myung Hun Kim, Seung Ho Lee, Chun Gwon Park, Se-Na Kim, Hye Sook Min, Hye Jeong Min, Jin Ho Chai, Sang Jeong Lee, Sukwha Kim, Tae Hyun Choi, Young Bin Choy
We prepared a bone plate enabled with the local, sustained release of alendronate, which is a drug known to inhibit osteoclast-mediated bone resorption and also expedite the bone-remodeling activity of osteoblasts. For this, we coated a bone plate already in clinical use (PLT-1031, Inion, Finland) with a blend of alendronate and a biocompatible polymer, azidobenzoic acid-modified chitosan (i.e., Az-CH) photo-crosslinked by UV irradiation. As we performed the in vitro drug release study, the drug was released from the coating at an average rate of 4...
January 28, 2016: Journal of Controlled Release: Official Journal of the Controlled Release Society
Masatsugu Hamaji, Bryan M Burt, Hiroshi Date, Tatsuo Nakamura
Reoperative pulmonary resection may be associated with a higher rate of postoperative complications secondary to postoperative adhesions. This review was designed to investigate the effect of a bioabsorbable material on postoperative intrapleural adhesions following thoracotomy. A search was performed in PubMed (United States National Library of Medicine) for original studies published in English and investigating a bioabsorbable material in preventing postoperative intrapleural adhesions, using the terms "pleural", "adhesion", and "surgery"...
February 2016: General Thoracic and Cardiovascular Surgery
Andreas Rudolph, Michael Teske, Sabine Illner, Volker Kiefel, Katrin Sternberg, Niels Grabow, Andreas Wree, Marina Hovakimyan
PURPOSE: Drug-eluting stents (DES) based on permanent polymeric coating matrices have been introduced to overcome the in stent restenosis associated with bare metal stents (BMS). A further step was the development of DES with biodegradable polymeric coatings to address the risk of thrombosis associated with first-generation DES. In this study we evaluate the biocompatibility of biodegradable polymer materials for their potential use as coating matrices for DES or as materials for fully bioabsorbable vascular stents...
2015: PloS One
Ming-Dong Zhao, Miina Björninen, Lu Cao, Hui-Ren Wang, Jani Pelto, Xiang-Qian Li, Jari Hyttinen, Yun-Qi Jiang, Minna Kellomäki, Susanna Miettinen, George K Sándor, Riitta Seppänen, Suvi Haimi, Jian Dong
Polypyrrole (PPy) has gained interest as an implant material due to its multifunctional properties and its high compatibility with several cell and tissue types. For the first time, the biocompatibility and osteointegration of PPy coating, incorporated with chondroitin sulfate (CS), were studied in vivo by implanting PPy-coated bioabsorbable bone fixation composite screws of poly-(lactide/glycolide) copolymer (PLGA) and β-tricalcium phosphate (TCP) into New Zealand white rabbits. Uncoated bioabsorbable polymer composite screws and commercially available stainless steel cortical screws were used as reference implants...
December 2015: Biomedical Materials
Sunil V Rao, Uwe Zeymer, Pamela S Douglas, Hussein Al-Khalidi, Jingyu Liu, C Michael Gibson, Robert W Harrison, Diane S Joseph, Reinilde Heyrman, Mitchell W Krucoff
Postinfarction left ventricular (LV) remodeling can result in chronic heart failure and functional impairment. Although pharmacological strategies for established heart failure can be beneficial, preventing remodeling remains a challenge. Injectable bioabsorbable alginate or "bioabsorbable cardiac matrix" (BCM), composed of an aqueous mixture of sodium alginate and calcium gluconate, is a sterile colorless liquid that is a polysaccharide polymer produced from brown seaweed. When exposed to excess ionized calcium present in infarcted myocardium, BCM assembles to form a flexible gel, structurally resembling extracellular matrix, which provides temporary structural support to the infarct zone through and beyond the time needed for mature fibrotic tissue to develop...
November 2015: American Heart Journal
Naghmeh Naderi, Michelle Griffin, Edward Malins, Remzi Becer, Afshin Mosahebi, Iain S Whitaker, Alexander M Seifalian
OBJECTIVE: Selection of the appropriate sterilisation method for biodegradable materials has been a challenging task. Many conventional sterilisation methods are not suitable for the next generation of biomaterials, mainly due to their complex composition, based on nanomaterials, often incorporating bioactive moieties. In this study, we investigate sterilisation efficacy of slow chlorine releasing compound sodium dichloroisocyanurate dihydrate (SDIC) for polyhedral oligomeric silsesquioxane (POSS)-poly(caprolactone urea-urethane) (PCL) scaffolds in comparison with conventional sterilisation methods...
February 2016: Journal of Biomaterials Applications
Jose M de la Torre Hernández, Paula Tejedor, Tamara Garcia Camarero, Juan M Duran, Dae-Hyun Lee, Jairo Monedero, Fermin Sainz Laso, Marcos Alvarez Calderón, Gabriela Veiga, Javier Zueco
OBJECTIVES: In this study we sought to evaluate coverage and apposition of Synergy™ stent at 3 and 6 months after implantation. BACKGROUND: The Pt-Cr everolimus-eluting stent with abluminal bioabsorbable polymer (Synergy™) is a new generation drug-eluting stent with features potentially favoring an early healing process which could make safe a shorter period of dual antiplatelet-therapy treatment. METHODS: Prospective, two-centers study enrolling patients with similar lesions treated with Synergy™ stents undergoing examination with OCT at 3 and 6 months in the respective centers...
September 2016: Catheterization and Cardiovascular Interventions
William Wijns, Maarten Jan Suttorp, Leszek Zagozdzon, Marie-Claude Morice, Dougal McClean, Pieter Stella, Dennis Donohoe, Charlene Knape, John Ormiston
AIMS: Our aim was to evaluate the two-year clinical results of a new sirolimus-eluting stent (MiStent SES) with a bioabsorbable coating designed for rapid polymer dissolution but sustained drug delivery. METHODS AND RESULTS: Major adverse cardiac events (MACE), target lesion failure (TLF), target vessel failure (TVF), and stent thrombosis (ST) at two-year follow-up are reported for the DESSOLVE I and II trials. In DESSOLVE I, the MiStent SES (n=29) demonstrated a 3...
June 20, 2016: EuroIntervention
Gustaf Gustafsson, Masahiro Nishida, Yoshitaka Ito, Hans-Åke Häggblad, Pär Jonsén, Tetsuo Takayama, Mitsugu Todo
Poly(ε-caprolactone) (PCL) is a ductile, bioabsorbable polymer that has been employed as a blend partner for poly(L-lactic acid) (PLLA). An improvement of the material strength and impact resistance of PLLA/PCL polymer blends compared to pure PLLA has been shown previously. To use numerical simulations in the design process of new components composed of the PLLA/PCL blend, a constitutive model for the material has to be established. In this work, a constitutive model for a PLLA/PCL polymer blend is established from the results of compressive tests at high and low strain rates at three different temperatures, including the body temperature...
November 2015: Journal of the Mechanical Behavior of Biomedical Materials
Enda L Boland, Rosa Shine, Nicola Kelly, Caoimhe A Sweeney, Peter E McHugh
The field of percutaneous coronary intervention has witnessed many progressions over the last few decades, more recently with the advancement of fully degradable bioabsorbable stents. Bioabsorbable materials, such as metallic alloys and aliphatic polyesters, have the potential to yield stents which provide temporary support to the blood vessel and allow native healing of the tissue to occur. Many chemical and physical reactions are reported to play a part in the degradation of such bioabsorbable materials, including, but not limited to, corrosion mechanisms for metals and the hydrolysis and crystallization of the backbone chains in polymers...
February 2016: Annals of Biomedical Engineering
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