Young-bin Choi

In this study, we developed an esophageal stent capable of sustained delivery of an anticancer drug, fluorouracil (5-FU). The stents were coated with drug-loaded poly(lactic-co-glycolic acid) (PLGA) nanofibers (DPN)via the electrospinning method, which exhibited a sustained drug release for up to 6 days. To prolong drug release,we also added the nanofiber layers composed of PLGA alone (PN), surrounding the DPN layer, as a more resistive diffusion barrier, where a period of drug release could be

We propose silicone implants capable of the local, controlled release of a glucocorticoid drug, triamcinolone acetonide (TA), for the prevention of fibrosis. The shells of these silicone implants were coated with two different loading amounts of TA, which could release the drug in a sustained manner for 12 weeks. The drug-loaded implants were inserted into the subcutaneous space in living rats, and the tissues were biopsied at scheduled times during 12 weeks. For the drug-coated implants, the ca

In clinical settings, intravesical instillation of a drug bolus is often performed for the treatment of bladder diseases. However, it requires repeated instillations to extend drug efficacy, which may result in poor patient compliance. To alleviate this challenge, implantable devices have been developed for the purpose of sustained, intravesical drug delivery. In this review, we briefly summarize the current trend in the development of intravesical drug-delivery devices. We also introduce the mo

To control postoperative pain, a bolus solution of anesthetic drugs is often injected locally, which,however, is limited by short-term drug efficacy and low bioavailability. To resolve this, we propose acomposite formulation of bupivacaine-loaded poly(lactic-co-glycolic acid) microparticles (BPC-MPs) andfibrin glue. We prepared the BPC-MPs using the emulsion method and formulated them withfibrin glueto produce FG_BPC-MPs. We performed in vitro drug release experiments for 35 days with theformula

Background Noninvasive monitoring of tear glucose levels can be convenient for patients to manage their diabetes mellitus. However, there are issues with monitoring tear glucose levels, such as the invasiveness of some methods, the miniaturization, inaccuracy, or the high cost of wearable devices. To overcome the issues, we newly designed a sucking disk-type (SD) strip biosensor that can quickly suck tear fluid and contains cerium oxide nanoparticle (CNP) that causes a unique color change accord

To enhance oral drug bioavailability, we propose mucoadhesive, nanostructured microparticles (PLGA/ PEG NM) as a drug-delivery vehicle. The PLGA/PEG NM herein retain nanofibrous structures within microparticles, and possess a seven-fold increase in specific surface area than conventional spherical microparticles, allowing for synergistic improvement of a mucoadhesive property. In vivo evaluations demonstrated that PLGA/PEG NM showed prolonged retention in the gastrointestinal tract, as compared

Metallic bone-fixation devices have been widely used in the treatment of fractured bones. However, there are still some unmet clinical needs associated with post-surgical infection and hampered bone repair. Therefore, to both prevent infection and enhance bone formation, we propose a titanium (Ti)-based bone plate for dual delivery of an antibiotic, vancomycin (VAN), and a bone-forming drug, alendronate (AL). In this work, we prepared the coating with a blend of a biodegradable polymer, poly(lac

We developed a modular tube-shaped device as a proof of principle to enable the programmed release of encapsulated molecules for controlled drug delivery. Each drug-delivery tube module was prepared by assembling two separate silicone tubes in a series, one filled with a model compound (sodium fluorescein) and the other with a diffusional barrier material (polyethylene oxide, PEO). We varied the length of the PEO-filled tubes to control the release from the drug-delivery tube devices. The onset

Poly(lactic acid) (PLA) is widely used in many different biomedical applications due to its biocompatibility, complete biodegradability, and non-toxic degradation products. However,PLA may be limited in particularly long degradation, which is not always desirable in many biomedical applications. In this short review, we summarized some of the most recent studies on controlling the degradation rate of PLA, employing copolymerization, blending, additives and irradiation. This review discussed the

Preparation of alginate hydrogel with human-derived adipose tissue toimprove fat graft survival and adipogenesis

Bioabsorbable plates and screws for bone fixation system have been used owing to many advantages over conventional metallic devices. This study investigated the effects and safety of recently developed modifiable bioabsorbable plate and screw made of 100% poly(L-lactic acid) in the healing process of mandible fracture in a rabbit model. In vitro extract test for cytotoxicity and bacterial reverse mutation test for genotoxicity were carried out. Any cytotoxicity caused by extract from experiment

We describe surgical sutures enabled with the local, sustained delivery of a TGF-β inhibitory drug, tranilast. To fabricate drug-delivery sutures, we separately prepared a tranilast-loaded strand using poly(lactic-co-glycolic acid), which was then physically braided with a surgical suture already in clinical use. By this method, the drug-delivery sutures maintained the mechanical strength and allowed the modulation of drug release profiles by simply altering the tranilast-loaded strand. The drug

Background: Silicone implants are biomaterials that are frequently used in the medical industry due to their physiological inertness and low toxicity. However, capsular contracture remains a concern in long-term transplantation. To date, several studies have been conducted to overcome this problem. This review summarizes and explores these trends. Main body: First, we examined the overall foreign body response from initial inflammation to fibrosis capsule formation in detail and introduced vario

To allow X-ray visibility, we coated a bioabsorbable bone plate in clinical use (PLT-1031, Inion, Finland) with a layer made of a composite of beta-tricalcium phosphate (β-TCP) and poly(lactic-co-glycolic acid) (PLGA) (i.e., β-TCP/PLGA plate) and assessed its in vivo acute biocompatibility for 4 months. For this, we fixed an intact Inion plate and β-TCP/PLGA plate on the left and right humeri of a New Zealand White rabbit, respectively. According to the X-ray imaging, the β-TCP/PLGA plate was ob