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Implants providing controlled, local release of active substances are of interest in different medical applications. Therefore, the focus of the present article is the development of implant-associated diffusion- or chemically controlled local drug delivery (LDD) systems based on biodegradable polymeric drug carriers. In this context, we provide new data and review our own recently published data concerning the drug release behavior of diffusion-controlled LDD systems in relation to the kind of polymer, drug content, coating mass/thickness, and layer composition. We demonstrate that polymers allow a wide range of control over the drug release characteristics. In this regard, we show that the glass transition temperature of a polymer has an impact on its drug release. Additionally, the blending of hydrophobic, semicrystalline polymers with amorphous polymers leads to an increase in the rate of drug release compared with the pure semicrystalline polymer. Moreover, the percentage loading of the embedded drug has a considerable effect on the rate and duration of drug release. Furthermore, we discuss chemically controlled LDD systems designed for the release of biomolecules, such as growth factors, as well as nanoparticle-mediated LDD systems. With our own published data on drug-eluting stents, microstents, and cochlear implants, we highlight exemplary implant-associated LDD systems designed to improve implant performance through the reduction of undesirable effects such as in-stent restenosis and fibrosis.
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http://dx.doi.org/10.1515/bmt-2012-0049 | DOI Listing |
Sci Rep
November 2024
Department of Orthopaedics, General Hospital of Ningxia Medical University, Yinchuan City of Ningxia, China.
Oblique lateral interbody fusion (OLIF) is a minimally invasive surgery for the treatment of lumbar degenerative diseases (LDD). Under normal bone mass(NB), supplemental with lateral plate (LP) fixation has been proven to provide stability and reduce complications. However, it is unclear whether OLIF combined with LP fixation can achieve satisfactory fixation effects in cases of osteoporosis(OP) or osteopenia (OS)? In this study, Eighteen L3-5 spinal specimens from 3 to 6 months old fresh calves were equally divided into 3 groups: group A (NB), group B (OS) and group C (OP).
View Article and Find Full Text PDFCir Cir
November 2024
Department of Neurosurgery, Sancaktepe İlhan Varank Training and Research Hospital, Istanbul, Turkey.
Objective: This research aims to assess the clinical and radiological outcomes of both dynamic rod system (PLSDR) and rigid rod system (PLSRR) when treating lumbar degenerative disease (LDD).
Method: A retrospective review of 98 patients who underwent posterior stabilization surgery with a posterior approach in our clinic between 2018 and 2023 was conducted. The patients were divided into two groups based on the type of implant used: Those with PLSRR (Group 1) and those with PLSDR (Group 2).
ACS Appl Mater Interfaces
November 2024
State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, and Tianjin Key Laboratory of Molecular Drug Research, Nankai University, Tianjin 300350, People's Republic of China.
Malignant tumors, also known as cancers, are a global public health problem. Nanogels are promising carriers for the delivery of anticancer medicines. Therefore, based on the unique microenvironment of tumor cells and the advantages of nanogels, a simple and economical one-pot synthesis method was designed to construct natural polysaccharide-based redox-responsive nanogels (LDD NGs).
View Article and Find Full Text PDFJ Funct Biomater
October 2024
College of Biology, Hunan University, Changsha 410082, China.
Osteosarcoma is one of the major bone cancers, especially for youngsters. The current treatment usually requires systemic chemotherapy and the removal of bone tumors. Titanium (Ti)-based implants can be modified as local drug delivery (LDD) systems for controllable and localized chemotherapeutic drug release.
View Article and Find Full Text PDFNeurol Neuroimmunol Neuroinflamm
November 2024
From the French Reference Center on Paraneoplastic Neurological Syndromes and Autoimmune Encephalitis (N.L.C.-P., S.M.-C., M.V.-G., A.F., V.W., L.D.D., V.R., G.P., B.J., J.H.), Hospices Civils de Lyon, Hôpital Neurologique, Bron; MeLiS - UCBL-CNRS UMR 5284 - INSERM U1314 (N.L.C.-P., S.M.-C., M.V.-G., A.F., V.W., L.D.D., V.R., G.P., B.J., J.H.), Université Claude Bernard Lyon 1, France; Instituto de Investigación Biomédica de Málaga y Plataforma en Nanomedicina-IBIMA Plataforma BIONAND (N.L.C.-P.); Red Andaluza de Investigación Clínica y Traslacional en Neurología (NeuroRECA) (N.L.C.-P.), Málaga, Spain; Center for Sleep Sciences and Medicine (S.M.-C.), Stanford University, Palo Alto, CA; Department of Neuroscience (A.F.), Psychology, Pharmacology and Child Health. University of Florence, Italy; Clinical Neurology (A.V.), Santa Maria della Misericordia University Hospital, Azienda Sanitaria Universitaria Friuli Centrale (ASU FC); Department of Medicine (DMED) (A.V.), University of Udine, Udine, Italy; Sorbonne Université (C.B.), Inserm, CNRS, UMR S 1127, Institut du Cerveau, ICM, AP-HP, Hôpitaux Universitaires La Pitié Salpêtrière - Charles Foix, Service de Neurologie 2-Mazarin; OncoNeuroTox Group (C.B.), Center for Patients with Neurological Complications of Oncologic Treatments, GH Pitié-Salpetrière et Hôpital Percy, Paris; Immunology Department (D.G., F.N.), Hôpital Lyon Sud, Hospices Civils de Lyon, Pierre-Bénite; Service de Neurologie (O.F.), Centre Hospitalier de la Côte Basque, Bayonne; Department of Neurology (C.D.), University Hospital of Tours; and Service de Neurologie (A.B.), Centre Hospitalo-Universitaire Rennes, France.
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