Wearable exoskeletons support selected movements by transferring force between a mechanical frame and the person wearing it. Passive designs redirect or return energy from the wearer’s movement; powered designs use actuators such as electric motors, pneumatics, or hydraulics to add force. Sensors and controllers coordinate assistance in some systems, while battery life varies by model and use: there is no single runtime for the category.
What a wearable exoskeleton does
An exoskeleton is an external mechanical structure worn on the body to support or augment selected movements. Its frame, straps, and joints make contact with the wearer and transfer forces; it does not create strength independently of fit or attachment. Systems are built for particular body regions and tasks, so a shoulder-support device, a back-assist system, and a medical walking device are not interchangeable examples.
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NIOSH distinguishes passive systems, which use unpowered mechanisms such as springs, dampers, elastic cords, or counterbalances, from active systems, which generate force or torque with powered components. The distinction is mechanical: passive devices redirect or return energy from movement, while active devices add force from an energy source. NIOSH’s overview of industrial exoskeletons describes both approaches.
How passive and powered designs provide assistance
Passive: storing or redirecting movement
A passive device can store energy as a wearer moves and return some of it to support a posture or motion. Springs, dampers, elastic elements, cables, and counterbalances can create a restoring force or route some load away from the body part doing the work. For example, a workplace shoulder-support mechanism may route the weight of raised arms toward the hips; a back-assist mechanism may supply a restoring force as someone bends. Because assistance is mechanical rather than motor-driven, a passive system does not need a battery to provide that assistance.
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Powered: adding force at a joint
Powered systems use actuators—components that produce movement or force—to contribute force or torque at one or more joints. NIOSH lists electric motors, pneumatics, and hydraulics as possible active-system technologies. The frame and its aligned joints transmit actuator force through the device to the wearer, so fit and alignment matter as much as the presence of a motor.
A powered lower-limb exoskeleton used for medical care is a specific regulatory category, not a definition of all workplace gear. The U.S. Food and Drug Administration describes a prescription device for medical use over weakened or paralyzed lower-extremity limbs; it uses controllers and/or sensors to facilitate movement at one or more lower-limb joints. FDA records show a 510(k) decision for Parker Hannifin’s Indego on September 8, 2017. That medical classification should not be applied to industrial products intended to support work tasks. FDA classification for powered lower-extremity exoskeletons and the Indego 510(k) record describe the medical context.
What sensors and controllers do
Sensors provide measurements about movement or the device’s state; a controller uses information to coordinate when and how powered assistance is delivered. The details differ among systems. FDA’s medical-device description refers to controllers and/or sensors, while Ottobock says its IX BACK VOLTON uses intelligent sensors to detect body movement and adjust support. That is a manufacturer description of one model, not evidence of a standard sensor package across exoskeletons. Ottobock’s November 2025 IX BACK VOLTON announcement describes that product’s sensing approach.
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Do not assume every exoskeleton reads muscle signals, predicts intent with artificial intelligence, or responds in the same way. The cited product and regulatory descriptions establish that sensing and control are used in some powered systems, but do not establish a universal control architecture or a full sensor list for IX BACK VOLTON.
How long an exoskeleton battery lasts
Battery runtime is model- and context-specific. The available figures below are manufacturer claims, not results from a common independent endurance test; clinical use and workplace use are not directly comparable.
| Device or design | Published runtime | Source and qualification |
|---|---|---|
| Ottobock IX BACK VOLTON | Up to 10 hours | Ottobock’s current workplace portfolio page, accessed in 2026, lists this figure and a device weight of 5.7 kg including battery. The page passage does not specify a standardized load or duty cycle. Ottobock workplace exoskeleton portfolio |
| Ottobock IX BACK VOLTON | Up to eight hours | Ottobock’s November 4, 2025 series-production announcement says the Bosch AMPShare battery provides up to eight hours. This conflicts with the current portfolio page’s up-to-10-hour claim; the sources do not explain the difference. Ottobock announcement |
| Ekso Indego Therapy | Four hours of clinical use | Ekso Bionics’ product sheet describes a rechargeable lithium-ion battery and four hours of clinical use. It is a rehabilitation-context figure, not a work-shift rating. Indego Therapy product sheet |
| Passive systems | No assistance battery required | Passive assistance uses unpowered mechanical elements, as described by NIOSH. |
Because Ottobock’s two published IX BACK VOLTON figures differ, check the current documentation for the exact model and configuration rather than treating either number as a verified guarantee. These examples do not establish how long exoskeleton batteries generally last or whether a particular powered system will cover a full shift.
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Where workplace exoskeletons are used—and what evidence says
NIOSH groups industrial systems by the tasks and body regions they support, including back assist, shoulder and arm assist, tool holding or support, and leg assist. A device may reduce demand in one area while changing where load is felt elsewhere, so task and system must be considered together. NIOSH’s occupational health equity overview reports lower muscle activity in some laboratory-based tasks: 10–44% lower back muscle activity during handling tasks, along with reported reductions of 24% in hip extensor activity and 50% in neck muscle activity. These observations are not guaranteed outcomes for every worker or task.
NIOSH cautions that a poorly matched system or task can shift loads or introduce other hazards. A vest-mounted stabilizing arm used with a heavy tool, for example, has been associated with increased spinal load. Other documented concerns include muscle strain if a powered unit moves a joint beyond the user’s normal range, skin irritation or chemical burns from a leaking corrosive battery, and thermal burns if a battery suddenly discharges stored energy. These risks support task-specific ergonomic assessment and training; they do not show that all exoskeletons are either safe or unsafe. NIOSH’s construction overview discusses the differing mechanics of passive and active systems.
Quick Recap
How to assess whether a system fits a task
- Match the device to the work. Identify the movement and body region that need support, such as overhead work, bending, tool holding, or walking.
- Understand the assistance path. Find out whether the system is passive or powered, what component supplies assistance, and where the frame transfers load.
- Check fit and movement. The system must suit the wearer and task without forcing joints beyond a normal range or restricting necessary movement.
- Read runtime as a model-specific claim. Confirm the exact version, battery, and stated use conditions; an advertised maximum is not a standardized endurance result.
- Assess changed loads and hazards. Consider whether support shifts strain to another body area and include battery, skin-contact, and powered-motion risks in workplace evaluation.
- Keep medical and workplace claims separate. A medical device’s regulatory status or intended use does not establish approval, indication, or effectiveness for industrial work.
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