DynamicArm transhumeral prosthesis

The dynamic and powerful elbow joint

Natural movement of the hand and elbow

Amputations above the elbow constitute a special challenge since the function of the elbow has to be replaced in addition to that of the hand. The DynamicArm elbow joint makes virtually natural movements possible with its special technology. Controlled by your muscle signals, the DynamicArm is driven by an electric motor. The control unit of the DynamicArm also transmits the muscle signals to the prosthetic hand, so that you are able to rotate the wrist unit in addition to opening and closing the hand with short response times. You can extend and flex the DynamicArm as well.

We recommend combining the DynamicArm with the Ottobock VariPlus Speed. It is equipped with a high-performance drive unit, and opens and closes almost three times as fast as other electric hands. A fitting with the DynamicArm and VariPlus Speed restores numerous abilities to hold objects, grasp and be active at work, in everyday life and recreation.

Control electronics

Numerous sensors continuously monitor the movements and load condition of the entire system. This information is transferred to the control electronics up to 100 times per second. It takes less than 1 second to bring the elbow joint from flexion to extension.

SensorHand Speed

Powerful, fast and intelligent: The functions of the SensorHand Speed are astounding. For example, the SensorHand Speed adjusts the grip at lightning speed if an object threatens to slip out of the hand.

Angle settings

In order to balance compensating movements in the shoulder joint, the wrist unit can be locked in 5 different positions.

Vario-Gear

The integrated electric motor is very quiet and the continuously variable gear mechanism provides the required force in real time, translating your muscle signals into the desired flexion or extension speed. You can actively lift up to 5 kg with the DynamicArm, which is five times the weight of the entire prosthesis.

Natural appearance

The prosthesis gloves are available in up to 6 different colours, the DynamicArm in three different colour variations.



Benefits at a glance

Secure hold

The integrated Autograsp feature of the SensorHand Speed helps you when an object you are holding starts to slip. The gripping force is increased in fractions of a second until the grasped object is in a safe position again.

Quick reflexes

At maximum speed, the SensorHand Speed opens and closes three times as fast as comparable electric hands. With a proportional speed of up to 300 mm per second, you are even able to react quickly while grasping.

Controlling forces

The gripping speed and gripping force are continuously monitored by two measuring systems and controlled in proportion to the muscle signals. Even difficult tasks such as grasping a tomato or other delicate objects do not pose a problem.

Natural dynamics

The DynamicArm prevents unnatural and jerky movements. The beginning of a movement is always controlled, and it is gently slowed at the end – just like the human arm.

Relaxed walking

An electronically controlled flexion aid supports flexion of the elbow joint. When the forearm swings freely while walking, this movement is naturally slowed. This is done discreetly and without sound.

Prosthesis gloves

The Skin Natural prosthesis gloves in 6 colours protect against dirt and dust. Their multilayer structure gives an appearance of depth. The outer, translucent layer simulates the natural vein structure of human skin.

Rotating the wrist unit

You can rotate the wrist unit to the inside and outside without the help of the other hand. This is controlled by your muscle signals.

Flowing movements

With the DynamicArm, you can perform more than one movement at a time – flexing the arm, rotating the wrist unit and grasping an object with the hand.

Functionality

Prosthesis training

The important prosthesis training phase begins for you once you have been fitted with a prosthesis. Making it possible for you to use the prosthesis so it actually helps you in your daily life is the goal. At the outset, an occupational therapist helps you practice movement patterns such as eating or getting dressed. With special exercises, you learn to position the prosthesis correctly to achieve an optimum position for grasping. Once you are sufficiently confident in using your prosthesis, you practice controlling your muscle strength. Items like foam rubber, drinking straws or paper cups help you determine the various amounts of pressure your muscle contractions can produce, and how this affects materials and solidity.

Technical information

Technology

The myoelectrically controlled DynamicArm responds to the respective muscle signals of the wearer. Thanks to the integrated electric motor, it also adapts to various loads automatically. With your muscle strength, you therefore continuously regulate the speed of your movements supported by the quiet vario-drive. Combined with a controller, which ensures the controlled acceleration of the DynamicArm at the start of a movement and soft deceleration at the end, movement patterns similar to the dynamic response of a human arm are achieved for the first time.

The flexion aid stores energy that is released when the forearm is lowered and then uses it when lifting the arm back up. This has a noticeable impact on energy consumption by the prosthesis: even with more intensive use, the permanently installed lithium-ion battery guarantees strong performance all day. The flexion aid also ensures the harmonious free swing of the arm. Your movements are natural as a result – without additional energy consumption or bothersome noises.

Care instructions

Ottobock Skin Natural gloves:

Cleaning the glove with water and soap is recommended for daily care. A special outer layer reduces the gloves' susceptibility to soiling and simplifies cleaning. If water and soap are insufficient, a special cleaner (640F12) with a pump sprayer (640F13) can be used. Please also note the specific care instructions of the special cleaner.

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"A handle on everything"

Brochure for users

FAQ

  • How do I get a DynamicArm?

    There are specialised and certified medical supply companies across the country that fit users with the DynamicArm. Your orthopaedic technician will advise you and answer all your questions about a possible fitting with the DynamicArm.

  • How do I control the DynamicArm?

    The DynamicArm is known as a myoelectrically controlled prosthesis, which means you control it with your own muscle signals. Here is how it works: Myoelectric is the technical term that refers to voltage generated by muscle activity, which can be measured on the skin surface. An electrode on the skin surface of your residual limb transmits the muscle signals to the DynamicArm in the form of electric voltage. Electric motors and microprocessors then convert these signals into specific movements.

  • Who is the DynamicArm suited for?

    The DynamicArm is suitable for virtually all persons with amputations in the upper arm and shoulder region as well as disarticulation – on one or both sides. It can be precisely adapted to your abilities: persons with strong muscle signals can use the DynamicArm just as well as users who can only generate weak or even no active muscle signals at all in their residual limb.

  • How do I learn how to control the prosthesis with muscle signals?

    Training the muscle signals is perhaps comparable to learning an instrument: practicing regularly is very important. If your socket is properly fitted and your musculature is in good condition, you should already see major progress after about 3 months.

  • What components are compatible with the DynamicArm?

    The DynamicArm is compatible with most myoelectrically controlled electric hands and electric grippers from Ottobock. A highly functional prosthesis system is achieved in combination with the especially responsive SensorHand Speed, offering maximum everyday independence for you.

  • What movements are possible with the DynamicArm?

    You can flex and extend the elbow joint, allowing you to lift or hold objects. The wrist unit can be rotated so you enjoy freedom of movement here as well. The SensorHand Speed can be opened and closed.


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