Otto Bock 3R78 - Product Description

1 Product description
English
INFORMATION
Date of last update: 2021-01-20
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Please read this document carefully before using the product and observe the safety
notices.
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Instruct the user in the safe use of the product.
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Please contact the manufacturer if you have questions about the product or in case of prob
lems.
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Report each serious incident related to the product to the manufacturer and to the relevant
authority in your country. This is particularly important when there is a decline in the health
state.
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Please keep this document for your records.
1.1 Construction and Function
The 3R78* Prosthetic Knee Joint is a polycentric prosthetic knee joint. It is available in the follow
ing versions:
• 3R78 (with proximal pyramid adapter; in combination with the 4R156* Tube Clamp Adapter
for hip disarticulation)
• 3R78=KD (with proximal lamination anchor for knee disarticulation)
• 3R78=ST (with proximal threaded adapter for long residual limb prostheses)
The upper joint section and lower joint section are connected by the two anterior links
and the posterior link to form a four-bar linkage. In extension, the instantaneous centre of rota
tion is located above the joint and behind the weight bearing line, thus providing knee stability
in the stance phase (see fig.2).
The prosthetic knee joint features a large flexion angle (150°) (see fig.3). It is equipped with auto-
adaptive, pneumatic swing phase control for walking at different speeds. Flexion and extension
damping can be adjusted separately and individually (see fig.4).
The integrated extension assist spring is part of the swing phase control mechanism and ensures
extension of the prosthetic knee joint.
1.2 Combination possibilities
INFORMATION
When fabricating a prosthesis for the lower limbs, all of the prosthetic components used have to
meet the requirements in regard to the patient's body weight and activity level.
Prosthetic components that are especially well suited for combination with the product are listed
below.
Designation Reference number
Screw adapter (with hip disarticulation or hemipel
vectomy)
4R156* (up to 100kg)
Tube Adapter 2R49, 2R3, 2R38
Foam Cover 3S107 (for 3R78* and 3R78*=ST, if needed also
3R78*=KD)
3R27* (for hip disarticulation)
6R6 (for 3R78*=KD)
For additional combination possibilities, please see the catalogue 646K2* or consult the manufac
turer.
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