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High costs and battery limits are among the challenges for manufacturers of exoskeletons, such as Ekso Bionics’ device for spinal patients.

Iron Man no longer fiction

Exoskeletons fit medical, military needs

Bloomberg News photos
Robert Woo walks with the aid an Ekso Bionics exoskeleton and physical therapist Shantel Firpi at Mount Sinai Medical Center in New York. The emerging technology has led to some models that sell for about $70,000 and weigh less than 50 pounds.

– Wearable machines that enhance human muscle power are poised to leave the realm of science fiction and help factory workers hoist heavier tools, lighten soldiers’ loads and enable spinal patients to walk.

Lockheed Martin and Parker Hannifin are joining a handful of startups in finding practical uses and, more important, paying customers for bionic suits inspired by novelist Robert Heinlein’s 1959 “Starship Troopers” and Stan Lee’s Iron Man comic-book character.

Sales of mechanical exoskeletons cap decades of scientific tinkering that included a 1,500-pound General Electric clunker in the 1960s. Strapped to users’ bodies and powered by lithium-ion batteries, the emerging technology has led to some models that sell for about $70,000, weigh less than 50 pounds and are nimble enough to dance the Macarena.

“We’re now seeing a golden age in which we can produce this technology and derive benefit from it,” said Keith Maxwell, the business development manager for Lockheed’s program. “There’s a host of industries where this works.”

The first commercial sale of a medical unit – not for lab or hospital tests – came in September, pioneering a field that may produce $400 million in annual revenue by 2020, according to technology consultant ABI Research. Lockheed says it hasn’t estimated the value of any contracts for its under-development military version, known by the acronym HULC, or for the nascent industrial market its Mantis device will enter this year.

The machines might follow a classic arc from Pentagon research project to fixture on an assembly line, similar to the development of lasers, said Paul Saffo, managing director of foresight at investment advisory firm Discern in San Francisco.

“The medical devices get the most attention, the military funds it, and the first mass application is industrial,” Saffo said in a telephone interview.

Developing technology for both civilian and military use would be a boost for Lockheed, the world’s largest defense contractor, as it confronts reductions in U.S. arms spending. Parker Hannifin, the biggest manufacturer of motion and control devices, is seeking to expand into the medical industry.

Commercial exoskeletons are just echoes of Hollywood’s take on Iron Man’s bulletproof garb and the armor that Heinlein envisioned for his futuristic warriors.

Ekso Bionics’ device for spinal patients looks like the lower half of a black metal skeleton able to stand by itself on foot pads. Parker Hannifin’s medical model breaks into five pieces and resembles elongated, plastic football thigh pads worn on the sides of users’ legs.

Electric motors amplify the strength in their wearers’ limbs or, in the case of the wheelchair-bound, to supply motive power. Computers and sensors help provide balance and guidance.

“There’s a huge wave of human augmentation coming,” said Ekso Bionics Chief Executive Officer Nathan Harding, whose company in Richmond, Calif., has devices in operation at New York’s Mount Sinai Hospital, the Kessler Institute for Rehabilitation in New Jersey and other spinal-cord injury centers. “It’s in its infancy.”

Argo Medical Technologies entered the market last year, with an exoskeleton to assist patients who have lost the use of their legs. Parker Hannifin’s Indego model also targets those users, and will go on sale in 2014 at a price the company says is competitive with Argo’s $67,230 unit.

Between those introductions will come Lockheed’s Mantis, which the company in Bethesda, Md., envisions as finding a home in any industry in which workers must hold heavy equipment that can cause fatigue and back injuries.

Mantis has a mechanical extension for a wearer’s arm and absorbs the strain from hefting a grinder or sander, Maxwell said. Tests found productivity gains of more than 30 percent, he said.

“It turns workers away from being a weightlifter and into a craftsman,” Maxwell said.

While Ekso Bionics’ Harding sees exoskeletons on an evolutionary path toward ever-greater sophistication – much as large portable phones of the early 1990s morphed into today’s smartphones – it might not be that easy to cut costs, simplify the technology and ensure widespread adoption.

“Even though there are processors and sensors, there’s still a lot of physical matter that has to be machined and built,” said Discern’s Saffo, who is also a consulting associate professor at Stanford University’s engineering school.

The other limitation is battery life. Batteries can be made only so powerful before turning into a bomb, Saffo said. Boeing knows the risks in working with larger versions of the lithium-ion cells found in mobile phones and other electronic gadgets: It’s still trying to figure out the cause of electrical faults that grounded its 787 Dreamliner.

“Until you have higher-density power storage, you’re always going to be looking for a plug for your exoskeleton,” Saffo said.

The exoskeleton industry is attractive because the potential is vast and the large competitors are few, according to Lockheed and Cleveland-based Parker Hannifin.

Lockheed envisions a leap forward in battlefield mobility with its Human Universal Load Carrier – whose HULC acronym evokes images of Marvel Comics’ Incredible Hulk, a green, super-strong mutant and sometime-ally of Iron Man. HULC is intended to let a soldier lug a 200-pound pack with minimal effort over a 12.4-mile hike.

Back strain is the most common noncombat injury because of the heavy packs soldiers carry, Maxwell said. Lockheed licensed some technology from Ekso Bionics to produce the HULC, which is set to enter a second development phase this year as the system is refined so it can be worn under a uniform.

Exoskeletons hold “tremendous potential” to ease those burdens, said David Accetta, a spokesman for the U.S. Army Natick Soldier Research, Development and Engineering Center in Massachusetts. A field demonstration is planned for May, he said by email. Lockheed said the program hasn’t been affected by mandated budget cuts that began March 1.

Parker Hannifin, which has been working with Vanderbilt University in Nashville, Tenn., is targeting Indego at the estimated 700,000 Americans with spinal cord injuries, said Achilleas Dorotheou, the program’s business unit manager. Another pool of potential users: the estimated 600,000 stroke survivors, many who are left with difficulties walking, he said.

Michael Gore, 42, who hasn’t walked on his own since falling 11 years ago from the mezzanine of a North Carolina vinyl-siding factory, has used an Indego exoskeleton to traverse uneven terrain and climb stairs. He has been testing the model since 2010 at the Shepherd Center in Atlanta, a private, nonprofit hospital specializing in spinal-cord injury treatment.

“It’s just a big emotional high to be able to stand up and speak to people face-to-face, eye-to-eye, instead of having to look up all the time,” Gore said in a telephone interview.

For now, the devices still require the use of crutches to maintain balance, and people probably will use them in combination with wheelchairs, Dorotheou said.

Parker Hannifin is playing catch-up with Argo Medical, which was founded by Amit Goffer, an Israeli who was paralyzed in a 1997 automobile accident. The company in Yokneam Illit, Israel, has sold about 65 medical exoskeletons, 20 of them to individuals in Europe.

Argo Medical still lacks federal clearance for U.S. sales to individuals, and the company may offer a product with fewer features to speed approval, CEO Larry Jasinski said.

Insurance companies eventually might cover part of the tab for medical exoskeletons because of the health benefits of greater mobility, Jasinski said. Ailments from sitting for prolonged periods include bone loss, urinary-tract complications, pressure sores, diabetes and obesity, he said.

Gore, who played sports in high school and worked on the family farm before his fall, is eager to see prices drop and insurers decide that the expense of an exoskeleton outweighs the medical costs of keeping the disabled in wheelchairs.

“If insurance would help out and I had to borrow $10,000 or $15,000, I would do that,” Gore said. “I would love to have one.”