Ottobock 3R66 Gebrauchsanweisung Seite 6

Attention – Reuse on another patient
Fall due to loss of functionality as well as damage to the product
• Only use the product for a single patient.
1.2 Construction and Function
The 3R66 Modular Polycentric Knee Joint is made of aluminum. Its main components are –
• upper joint section with pyramid
• mid-joint section with adjustable stop
• lower joint section with extension assist mechanism and clamp shell for tube adapter and
integrated rotation unit.
The sections are connected to each other by four axes and two polycentric linkage bars
This polycentric joint provides a rotational and translational movement and a shifting of its center
of rotation during flexion and extension. In the extended position the center of rotation (instanta-
neous center of rotation) is placed above the pyramid and behind the weight bearing line, thus
providing greater knee stability during stance phase.
The extension assist can be adjusted for control during swing phase. Reversal of the extension
assist action occurs when flexion reaches approximately 90°.
A new technical feature of this knee is its integrated rotation capability which allows for the actual
rotation of the prosthetic foot (fig. 1, 2), if desired.
Combined with a generous flexion angle of approx. 165° (fig. 2) this enables the child to easily
move into a squatting, kneeling or sitting position with the foot rotated to the outside.
The prosthetic foot will automatically turn back to the neutral position when unloaded.
2 Alignment and Assembly (fig. 5)
The starting point for achieving correct static alignment is to determine the individual weight bear-
ing line and to transfer the measurements to the prosthetic components.
The position of the axes influences the joint's function. The joint is factory adjusted to the basic
alignment, where the reference line runs in front of the anterior upper axis (see diagram).
The use of the 1K10 Dynamic Foot for Children or the 1K30 / 1S30 SACH Foot makes for an excel-
lent combination with this knee joint. The tube adapter connects the knee joint to the prosthetic foot.
Torque moment for tightening the clamp screw: 5 Nm (3.7 ft.lbs.) using the 710D1 Torque Wrench.
Torque moment for tightening the adjustment screws of the adapter: 9 Nm (6.6 ft. lbs.) using the
710D1 Torque Wrench.
Secure the screws using 636K13 Loctite.
3 Adjusting Stance and Swing Phase Control
Before making any changes to the factory-settings, the following must be kept in mind:
3.1 Stance Phase Stability
This polycentric knee joint with its special joint geometry and arrangement of axes has been designed
for the child patient to comply with his/her requirements regarding stability. The joint is factory-set
to maximum stability. It can be adjusted by turning the stop screw using a 3 mm wrench (fig. 3).
Turning to the right = less stability = (flexion can be easily initiated).
Turning to the left = more stability = (flexion is more difficult).
* the enclosed decorative decals can be attached here.
6 | Ottobock
* .
3R66