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Ophthalmic Drug Delivery Systems

Ophthalmic Drug Delivery Systems

Ophthalmic drug delivery faces major limitations due to poor absorption across the corneal membrane. This process is primarily driven by diffusion and is influenced by two main factors: the physicochemical properties of the drug and tear drainage. Most ophthalmic drugs, such as pilocarpine, epinephrine, atropine, and local anesthetics, are weak bases. They are typically formulated at an acidic pH to enhance chemical stability. However, this leads to high ionization, reducing their ability to...

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Mini drug pump for ophthalmic use.

Saloomeh Saati¹, Ronalee Lo, Po-Ying Li

¹Doheny Eye Institute, University of Southern California Keck School of Medicine, Los Angeles, California, USA.

Transactions of the American Ophthalmological Society

|February 4, 2010

Summary

This summary is machine-generated.

Researchers developed a novel mini drug pump for ophthalmic use, demonstrating feasibility through benchtop and rabbit implantation studies. The device was successfully refilled and showed no adverse effects, indicating potential for drug delivery systems.

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Area of Science:

Ophthalmology
Biomedical Engineering
Drug Delivery Systems

Background:

Ophthalmic drug delivery presents challenges due to the eye's unique physiology.
Novel drug delivery systems are needed to improve therapeutic efficacy and patient compliance.
Miniaturized, implantable pumps offer a potential solution for sustained ocular drug administration.

Purpose of the Study:

To evaluate the feasibility of developing and implanting a novel mini drug pump for ophthalmic applications.
To assess the refilling capability and patency of the implanted drug pump.
To investigate the initial safety and biocompatibility of the prototype device in an animal model.

Main Methods:

A microelectromechanical systems (MEMS) based mini drug pump utilizing electrolysis for drug delivery was fabricated.
The pump incorporated a drug refill port and a check valve for controlled delivery.
Benchtop testing and implantation in rabbits were performed, followed by transconjunctival needle access for refilling and slit-lamp examinations.

Main Results:

Benchtop tests demonstrated a drug delivery rate of 2.0 microL/min with 0.4 mW power.
One-way valves exhibited reliable opening pressures of 470 mm Hg.
All implanted pumps were successfully refilled at 4-6 week intervals for 4-6 months with no observed infections, extrusion, or filtering blebs.

Conclusions:

A prototype ocular mini drug pump was successfully constructed, implanted, and refilled in a rabbit model.
The study confirms the feasibility of this platform for ophthalmic drug delivery.
Further research is required to assess long-term biocompatibility and the efficacy of various pharmacologic agents for ophthalmic use.