Amazingly cheap pocket-sized ultrasound device could revolutionize medical treatment

December 22, 2008

(ChattahBox) — A Cornell University graduate student has developed a prototype of a therapeutic ultrasound device, that is smaller, more powerful and perhaps 200 times less expensive than today’s models.  The groundbreaking device fits in the palm of a hand, is battery-powered and packs and is wired to a ceramic probe, called a transducer. It creates sound waves so strong they instantly cause water to bubble, spray and turn into steam and packs enough punch to stabilize a gunshot wound or deliver drugs to brain cancer patients.

George K. Lewis, a third-year Ph.D. student in biomedical engineering and a National Science Foundation fellow, created the ultrasound devices tinkering in his Olin Hall lab. Lewis, whose paper is co-authored by his adviser, William L. Olbricht, Cornell professor of chemical and biomolecular engineering, in the journal Review of Scientific Instruments (79-114302), published online Nov. 11. Today’s ultrasound machines can weigh 30 pounds and cost $20,000, which is of course passed on to patients. Compare that to George’s pocket-sized device which he built with $100. He envisions a world where therapeutic ultrasound machines are found in every hospital and medical research lab.

“New research and applications are going to spin out, now that these systems will be so cheap, affordable and portable in nature,” Lewis said.

Lewis miniaturized the ultrasound device by increasing its efficiency. Traditional devices apply 500-volt signals across a transducer to convert the voltage to sound waves, but in the process, about half the energy is lost. In the laboratory, Lewis has devised a way to transfer 95 percent of the source energy to the transducer.

Ultrasound is typically used as a nondestructive imaging technique in medical settings. Sound waves, inaudible to humans, can generate images through soft tissue, allowing, for instance, a pregnant woman to view images of her baby. But the higher-energy ultrasound that Lewis works with can treat such conditions as prostate tumors or kidney stones by breaking them up. His devices also can relieve arthritis pressure and even help treat brain cancer by pushing drugs quickly through the brain following surgery. Lewis suggests that his technology could lead to such innovations as cell phone-size devices that military medics could carry to cauterize bleeding wounds, or dental machines to enable the body to instantly absorb locally injected anesthetic.

His new devices are currently being tested in a clinical setting at Weill Cornell Medical College, under the direction of Jason Spector, M.D, director of Weill Cornell’s Laboratory for Bioregenerative Medicine and Surgery and assistant professor of plastic surgery, Peter Henderson, M.D.
The medical doors that Lewis’ device may one day open are groundbreaking, Henderson said.

“People are realizing that when harnessed appropriately, you can use ultrasound to treat things as opposed to just diagnose them,” Henderson said. “It’s a wide-open field right now, and George’s device is going to play a huge role in catalyzing the discovery of new and better therapeutic applications.”


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