How the i-limb works

gesture control - available with i-limb quantum

The i-limb quantum™ incorporates the company's patented and groundbreaking gesture control, powered by i-mo™ technology. It is the first and only upper limb prosthesis which allows the wearer to change grips with a simple gesture. Gesture control enables an automated grip to be accessed by moving the i-limb quantum in one of four directions. The i-limb quantum comes pre-programmed with a selection of practical grips, and these can easily be changes through the app.

By mastering only the hold open signal, the i-limb quantum wearer will have access to a wide variety of grips and utility, via the intuitive and natural function of gesture control.

To watch a gesture control demonstration video, click here

app control - available with i-limb quantum, i-limb revolution, and i-digits

App control is made possible with quick grips™ technology allowing instant access to up to 24 different grips. 

A user may want to use a wide variety of grips throughout the day, and utilize more features than what they are currently capable of using with muscle triggers alone.  The user can simply open the my i-limb app on their mobile device to access quick grips. Up to 24 different grips can be selected, allowing instant access to new grips with the tap of a button on the app screen. An additional 12 custom my grips may also be programmed offering the user up to 36 different grips. 

Bertolt demonstrates quick grips with the my i-limb app: 

muscle control - available with all i-limb products

The i-limb is an externally powered prosthesis often controlled by myoelectric signals, meaning it uses muscle signals in the patient’s residual limb to move the device. Electrodes are placed on the user’s bare skin above two pre-selected muscle sites. When a user contracts these muscles, the electrodes pick up subtle changes in the electrical patterns and send these signals to a microprocessor which instructs the i-limb to open and close.  

Triggers

The i-limb can open and close into several different grip such as a lateral grip or precision pinch. Users can assign their most commonly used grip to up to four different muscle triggers.

  1. `hold open’ (using the open signal for a set period of time)
  2. `double impulse’ (two quick open signals after the hand is fully open)
  3. `triple impulse’ (three quick open signals after the hand is fully open)
  4. `co-contraction’ (contracting both the open and close muscles simultaneously)

When the user activates any one of these triggers, the i-limb will move into the grip that has been assigned to it.  

The number of triggers programmed depends on each individual’s ability to control and activate the signals.  As the user’s control and strength improves over time with practice, the user can assign more triggers to grips for improved dexterity and function. 

demonstration of muscle triggers to pack a suitcase:  

proximity control - available with the i-limb quantum and i-limb revolution

Proximity control is made possible by grip chips™ technology which are small Bluetooth® enabled devices that allow users to enter any available grips simply by moving their i-limb device close to an object where a grip chip is placed.  By using the my i-limb app, users can program each grip chip with different settings.

For example, a user might place a grip chip near his or her laptop to activate a feature suitable for typing such as “index point.”  Another grip chip might be placed by the plates in the kitchen to allow the hand to enter “lateral grip” for picking up plates with ease.  

demonstration of grip chips: