College Park, Md. (April 6, 2011) -- A new drug delivery device designed and constructed by Jie Chen, Thomas Cesario and Peter Rentzepis promises to unlock the potential of photosensitive chemicals to kill drug-resistant infections and perhaps cancer tumors as well.
Photosensitive chemicals are molecules that release single oxygen atoms and chemical radicals when illuminated. These radicals are very active chemically, and can rip apart and destroy bacteria, said Peter Rentzepis, a professor of chemistry at University of California, Irvine.
Yet photosensitive chemicals are not approved for use in the United States, and used relatively rarely in Europe. This is because they are highly toxic and difficult to activate beneath the skin, since light only penetrates a few millimeters into the body.
Photosensitive chemicals also cause severe reactions, including headaches, nausea, and light sensitivity for 30 days. They kill healthy cells as well as bacteria. Although several have therapeutic potential, they are too toxic for human use by injection.
The researchers solved this problem with an optical fiber-based device that can deliver very small amounts of photosensitive chemicals to internal organs with pinpoint accuracy.
The device consists of three components. The first is an imaging component similar to the charge coupled devices (CCDs) in digital cameras. It enables a physician to guide the device to the infection.
A 1-millimeter-diameter flexible optical fiber attached micro sized high-power LED or laser diode provides the light for the CCD. Once the physician positions the device, the same light source shines with greater intensity to activate the medicine.
The third component is a hollow tube connected to a syringe of medicine to deliver the medicine to the infection. Rentzepis adds glycol, a thickening agent used in surgical soaps, to keep the medicine from spreading to healthy cells.
'/>"/>
| Contact: Charles Blue cblue@aip.org 301-209-3091 American Institute of Physics Source:Eurekalert |
Related biology news :
1. University of Nevada, Reno invents next-gen device to track worlds air quality
2. MIT: New blood-testing device can quickly spot cancer cells, HIV
3. New device uses submarine technology to diagnose stroke quickly
4. UCLA Engineering advance with new nanomaterials good news for next-generation electronic devices
5. University of South Florida and Draper team to create advanced devices for testing malaria drugs
6. Armchair nanoribbons made into spintronic device
7. Simple, ingenious way to create lab-on-a-chip devices could become a model for teaching and research
8. Microfluidic device rapidly orients hundreds of embryos for high-throughput experiments
9. Simple rubber device mimics complex bird songs
10. Air flows in mechanical device reveal secrets of speech pathology
11. Study shows brass devices in plumbing systems can create serious lead-in-water problems
| Copyright © 2003-2012 Bio-Medicine. All rights reserved. ABOUT | CONTACT US | DISCLAIMER | PRIVACY POLICY | TERMS AND CONDITIONS |  |