NEW YORK — Doctors are often lauded as miracle workers, but even the most skilled have patients they can't help. Demetrios Leontaris keeps a picture of one on his cell phone organizer.

Tapping at his keypad, he smiles as he pulls up a picture of the ill-fated patient: an iPod Nano left badly bruised after being run over by a car. While it still played, attempting to repair the casing could have broken the device.

A self-styled iPod doctor, the affable Leontaris is a full-time iPod resuscitator, part of a cottage industry catering to music devotees whose musical companions have fallen ill, usually from mistreatment.

Aaron Vronko, co-founder of iPodmods.com, chuckles when recalling some of the grisly injuries he's seen. Some devices have been slammed in car doors, another was partially melted when left too close to a light bulb. Still others have been rather expensive chew toys for dogs. Some are sent through washing machines.

For the grieving, the third-party repair shops offer hope. Even the most earnest-looking iPod owner would be too sheepish to try to exchange a water-logged iPod. In one such case, Vronko notes, the familiar whirr of the spinning hard drive took on a more ominous sound: "You could hear it swishing around in there. There wasn't much we could do."

Apple Inc., maker of the popular music players, doesn't, for example, accept exchanges on iPods under warranty if their screens have been cracked or if it's clear they've been dropped. Customers can purchase a warranty extension that tacks a second year onto their coverage; the cost varies depending on the model.

The entrepreneurs have stepped in for those hoping to repair their iPods rather than buy new. Leontaris began repairing iPods and other digital music players about three years ago after he bought a used iPod online only to find it didn't work.

"We were poor growing up, so you didn't just throw it out and get a new one," the 32-year-old Leontaris said of his childhood in Union, N.J., where he still lives. "If the VCR broke, it was going to be another few months before we got one."

So the idea that people would want to repair portable music players — iPods range from about $80 to $350 — seemed logical to Leontaris.

He set up his Web site, www.nycipoddoctor.com, to draw customers from nearby New York City. Leontaris most often brings his SUV-cum-workshop to the customer, many of whom wait in the passenger seat, watching as he goes to work on their ailing device.

One customer, Tausif Husain, 38, of Queens, N.Y., recently watched as Leontaris gave a scratched video iPod a facelift by replacing the front and the back covers. Leontaris searched his cache of impossibly small screwdrivers — kept in what was once a cup holder — and placed the back plate of the now-disjoined iPod over the windshield's defrost vents. The heat from the vents loosened the adhesive that helps hold some of the device's parts in place.

As iPod and its competitors shed their girth and the devices rely on ever-smaller components, Leontaris expects his job will grow more difficult.

"They're getting more complex. I'm probably going to be obsolete as time goes on," he said.

For now, though, he has found a business that enables him to help support his wife and three children, charging $45 and up to replace a battery and $59 and up for a new screen, for example.

Others have carved out a business as well. Web sites likes www.iPodResQ.com and Vronko's www.iPodmods.com have sprung up for those looking to inject new life into their iPods.

Vronko, 24, founded iPodMods in Kalamazoo, Mich., with a friend after studying business in college; they set up the Web site in 2004. It has drawn customers from more than 65 countries.

"We've gone from five a week to 500," he said.