Technical Data - Ottobock 3R20 Gebrauchsanweisung

The Ottobock MOBIS is not intended to be used as a guide to obtaining reimbursement
for prosthetic components in the USA.
2.3 Service life
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.
• Inform the patient.
Attention!
Please avoid exposing prosthetic components to surroundings that corrode metal parts, for
example, freshwater, saltwater, acids and other liquids. Using this medical product in such
environmental conditions will render all claims against Otto Bock HealthCare null and void.
Please inform your patients.
INFORMATION
As a basic principle, all Ottobock knee joints are subjected to tests involving three million load
cycles. Depending on the amputee's activity this corresponds to a service life of three to five years.
We recommend carrying out regular safety checks once a year.
2.4 Construction and function
Upper Joint Section (1) and Lower Joint Section (2) are bound together through four rotation
axes according to the engineering principle of a closed kinematic chain. The two Anterior Link-
age Bars (8) with cone shaped axis pins and the Posterior Linkage bar (6) provide the moveable
connection. The Extension Assist (11–15) accommodated in the Lower Joint Section extends the
joint until this is limited by the adjustable, elastic Extension Stop (5).
The joint provides a rotational and translational movement due to its polycentric action. During
flexion the centre of rotation changes its position, dependent on the degree of flexion (instantane-
ous centre of movement/rotation). In the extended position the instantaneous centre of rotation
is located above the joint and posterior to the weight bearing line, thus providing knee stability in
the stance phase (see section 4).

3 Technical data

Article number
Proximal connection
Distal connection
Knee flexion angle
Weight
System height
Proximal system height up to alignment reference point
Distal system height up to alignment reference point
Max. user weight
Mobility Grade
12 | Ottobock
3R20
Pyramid adapter
Pyramid adapter
110°
820 g
41 mm
– 3 mm
44 mm
100 kg / 220 lbs
1 + 2
3R20
445 g
3R20, 3R36