Otto Bock 7E10 Helix 3D, Instructions For Use Manual

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30 | Ottobock Helix
2 Description and function
2.1 Design
The patented Helix
3D
Hip Joint is the first commercially available hip joint with hydraulic stance phase and swing
phase control. Its design features enable the prosthesis wearer to achieve a harmonious and smooth gait pattern.
The following particularities characterise the hip joint:
• Spatial movement of the hip: The patented, multi­axis joint structure effectuates spatial movement of the hip.
In addition to usual flexion and extension, this spatial movement is a combination of abduction and adduction
as well as inward and outward rotation imitating the natural movement. Therefore, the Helix
3D
Hip Joint versions
7E10=L for left­side amputees and 7E10=R for right­side amputees are available. In addition, the multi­axis
joint structure results in greater reduction of the leg length during the swing phase and thus facilitates walking
with the prosthesis.
• Hydraulically controlled extension and flexion: An innovative hydraulic unit controls the resistance of the hip
joint during each phase of gait. During the stance phase, it allows for dampened, controlled heel strike with
significantly reduced backward tilt of the pelvis (hypolordosis) as well as harmonious hip joint extension. The
hydraulic unit also controls the stride length during the swing phase. It can be adjusted to the individual require­
ments of the prosthesis wearer.
• Support of swing phase initiation: During the stance phase, integrated expansion springs store mechanical
energy. This energy is used to initiate the swing phase in order to compensate to some degree for the missing
hip flexors. As a result, less energy is required for walking.
• Optimal sitting characteristics: Since the Helix
3D
Hip Joint has a low structural height when installed, "pelvic
obliquity" in the sitting position can be reduced to a minimum. Moreover, the flexion angle of the Helix
3D
Hip
Joint is very large enabling comfortable sitting.
2.2 Fitting packages
The Helix
3D
Hip Joint's functions are specially adapted to the characteristics of selected Ottobock components.
Proper function of the Helix
3D
Hip Joint during the liability period can only be guaranteed, if it is used in combina­
tion with the appropriate products (see "System Components at a Glance", p. 2).
Please select the corresponding fitting package according to the mobility grade and requirements of the prosthe­
sis wearer, as explained during the certification workshop.
3 Alignment, adjustment and assembly
INFORMATION
Correct alignment is crucial for an optimal function of the prosthesis!
For this reason, a test socket is used for the works described in sections 3 and 4 (positioning of the lamination
plate, alignment, dynamic trial fitting). The manufacturing technologies required for these works (including those
required for the definitive pelvic socket) are taught during the certification workshop.
INFORMATION
For the alignment of the prosthesis described below, please proceed in two steps:
First make the bench alignment using an alignment tool such as 743L200 L.A.S.A.R. Assembly.
For subsequent optimisation of the static alignment, please use 743L100 L.A.S.A.R. Posture.