scholarly journals A Totally Implantable Drug Delivery System for Local Therapy of the Middle and Inner Ear

1997 ◽  
Vol 76 (8) ◽  
pp. 567-570 ◽  
Author(s):  
Rolf Lehner ◽  
Heribert Brugger ◽  
Marcus M. Maassen ◽  
Hans-Peter Zenner
Keyword(s):  
Drug Delivery ◽  
Inner Ear ◽  
Drug Delivery System ◽  
Delivery System ◽  
Drug Application ◽  
Local Therapy ◽  
Trophic Factors ◽  
Mastoid Cavity ◽  
Round Window Membrane ◽  
Wide Range

Local therapy of middle and inner ear diseases is being used, but is restricted to cases of ear drum perforation or to repeated invasive intratympanic drug application by the physician. In accordance with the Medical Device Directive (class III), a bone-anchored, totally implantable drug delivery system (TI-DDS) has been developed. It includes a micropump for subcutaneous, patient-controlled activation, a drug reservoir and a septum port. A thin guide-wired catheter leads from the pump outlet to the point of application in the mastoid or middle ear cavities. Local inner ear therapy with suitable drugs is possible by positioning the catheter's end near the round window membrane. The system requires no battery and will offer a wide range of patient-controlled bolus applications (25 μl per activation). We first analyzed the three-dimensional implantation geometry of the mastoid cavity. Basic micromechanical problems have been solved in order to create several prototypes. The TI-DDS has already undergone extensive in vitro testing. Recent results of pump rate precision and digital pressure force testing are promising. Local drug treatment for conditions such as lidocaine-sensitive tinnitus, secretory otitis media, Meniere's disease, localized pain and intralesional cancer is under discussion. Furthermore, local application of future biotechnological trophic factors for inner ear treatment is anticipated. The basic engineering is completed and initial animal tests are in preparation.

scholarly journals Marine Polysaccharides as a Versatile Biomass for the Construction of Nano Drug Delivery Systems

Marine Drugs ◽  
2021 ◽  
Vol 19 (6) ◽  
pp. 345
Author(s):  
Ying Sun ◽  
Xiaoli Ma ◽  
Hao Hu
Keyword(s):  
Drug Delivery ◽  
Drug Delivery System ◽  
Delivery System ◽  
Pharmaceutical Preparations ◽  
Utilization Efficiency ◽  
Wound Dressings ◽  
Marine Biomass ◽  
Nano Drug Delivery ◽  
Wide Range ◽  
Marine Polysaccharide

Marine biomass is a treasure trove of materials. Marine polysaccharides have the characteristics of biocompatibility, biodegradability, non-toxicity, low cost, and abundance. An enormous variety of polysaccharides can be extracted from marine organisms such as algae, crustaceans, and microorganisms. The most studied marine polysaccharides include chitin, chitosan, alginates, hyaluronic acid, fucoidan, carrageenan, agarose, and Ulva. Marine polysaccharides have a wide range of applications in the field of biomedical materials, such as drug delivery, tissue engineering, wound dressings, and sensors. The drug delivery system (DDS) can comprehensively control the distribution of drugs in the organism in space, time, and dosage, thereby increasing the utilization efficiency of drugs, reducing costs, and reducing toxic side effects. The nano-drug delivery system (NDDS), due to its small size, can function at the subcellular level in vivo. The marine polysaccharide-based DDS combines the advantages of polysaccharide materials and nanotechnology, and is suitable as a carrier for different pharmaceutical preparations. This review summarizes the advantages and drawbacks of using marine polysaccharides to construct the NDDS and describes the preparation methods and modification strategies of marine polysaccharide-based nanocarriers.

scholarly journals Promising Applications of Nanoparticles in the Treatment of Hearing Loss

2021 ◽  
Vol 9 ◽  
Author(s):  
Zilin Huang ◽  
Qiang Xie ◽  
Shuang Li ◽  
Yuhao Zhou ◽  
Zuhong He ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Hearing Loss ◽  
Inner Ear ◽  
Drug Delivery System ◽  
Clinical Application ◽  
Delivery System ◽  
Diagnosis And Treatment ◽  
Biological Research ◽  
Medical Applications ◽  
Traditional Treatment

Hearing loss is one of the most common disabilities affecting both children and adults worldwide. However, traditional treatment of hearing loss has some limitations, particularly in terms of drug delivery system as well as diagnosis of ear imaging. The blood–labyrinth barrier (BLB), the barrier between the vasculature and fluids of the inner ear, restricts entry of most blood-borne compounds into inner ear tissues. Nanoparticles (NPs) have been demonstrated to have high biocompatibility, good degradation, and simple synthesis in the process of diagnosis and treatment, which are promising for medical applications in hearing loss. Although previous studies have shown that NPs have promising applications in the field of inner ear diseases, there is still a gap between biological research and clinical application. In this paper, we aim to summarize developments and challenges of NPs in diagnostics and treatment of hearing loss in recent years. This review may be useful to raise otology researchers’ awareness of effect of NPs on hearing diagnosis and treatment.

A Novel Controlled Local Drug Delivery System for Inner Ear Disease

2008 ◽  
Vol 118 (4) ◽  
pp. 706-711 ◽  
Author(s):  
David P. Paulson ◽  
Waleed Abuzeid ◽  
Hao Jiang ◽  
Tomoyuki Oe ◽  
Bert W. O'Malley ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Inner Ear ◽  
Drug Delivery System ◽  
Delivery System ◽  
Local Drug Delivery ◽  
Inner Ear Disease ◽  
Local Drug Delivery System

Development of a drug delivery system for the inner ear using poly(amino acid)-based nanoparticles

Drug Delivery ◽  
2014 ◽  
Vol 22 (3) ◽  
pp. 367-374 ◽  
Author(s):  
Dong-Kee Kim ◽  
Shi-Nae Park ◽  
Kyoung-Ho Park ◽  
Chan Woo Park ◽  
Keum-Jin Yang ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Amino Acid ◽  
Inner Ear ◽  
Drug Delivery System ◽  
Delivery System

A Novel Drug Delivery System: A Biodegradable Gel for the Treatment of Inner Ear Diseases

2004 ◽  
Vol 131 (2) ◽  
pp. P260-P260 ◽  
Author(s):  
Tsuyoshi Endo ◽  
Takayuki Nakagawa ◽  
Tomoko Kita ◽  
Tae Soo Kim ◽  
Fukuichiro Iguchi ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Inner Ear ◽  
Drug Delivery System ◽  
Delivery System ◽  
Ear Diseases ◽  
System A ◽  
Novel Drug Delivery System ◽  
Novel Drug

Investigation of Nanoscale Structure of Self-Emulsifying Drug Delivery System Containing Poorly Water-Soluble Model Drug

2014 ◽  
Vol 970 ◽  
pp. 272-278 ◽  
Author(s):  
Mont Kumpugdee-Vollrath ◽  
Yotsanan Weerapol ◽  
Karin Schrader ◽  
Pornsak Sriamornsak
Keyword(s):  
Drug Delivery ◽  
Drug Delivery System ◽  
Delivery System ◽  
Correlation Spectroscopy ◽  
Water Soluble ◽  
Wide Range ◽  
Poorly Water Soluble ◽  
Nanoscale Structure ◽  
Model Drug ◽  
20 Nm

This work has a focus on the self-emulsifying drug delivery system (SEDDS), which can be used in pharmaceutical field for increasing bioavailability of poorly water-soluble drugs. The model drug resveratrol was used because of its poor water-solubility and is of interest because of its wide range of pharmacological effects. It is beneficial to understand the mechanism of SEDDS formation in the human body, therefore, the determination of nanoscale structure was carried out. For this purpose, small angle X-ray scattering (SAXS), photon correlation spectroscopy (PCS), and transmission electron microscopy (TEM) techniques were applied. We have found that the size and size distribution of particles were in nanometers. The inner structure of SEDDS was ordered with the lamellar distances (d-spacing) of < 20 nm. It seems that the prepared SEDDS in water form large oil drops (200-400 nm) in water as well as small micelles with the droplet size of 10-20 nm.

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