Construction And Function - Ottobock 3R93 Instrucciones De Uso

Prosthetic components must not be exposed to corrosive elements such as fresh water, salt
water and acids. Penetration of liquids, dust, sand, etc. as well as the use of the knee joint at
places with excessive ambient moisture must be avoided.
CAUTION
Risk of pinching in the flexion range area of the joint. It must be explicitly pointed out to the
prosthesis wearer that there must not be any fingers/body parts in this area when flexing the joint.
NOTICE
Risk of damage due to incorrect environmental conditions. Prosthetic components must not
be exposed to corrosive elements such as fresh water, salt water and acids. Penetration of
liquids, dust, sand, etc. as well as the use of the knee joint at places with excessive ambient
moisture must be avoided.
Using this medical device in such environmental conditions will render all claims against Otto
Bock HealthCare null and void.
INFORMATION
Use parallel bars for the first trial walk of the prosthesis wearer with the knee joint.

2.5 Construction and function

The 3R93 Knee Joint is a monocentric knee joint with a load-dependent brake mechanism and
an optional locking function.
Due to its construction, the 3R93 can be used as a locked knee joint with manual lock release
(pulling the pull cable) and as a friction brake knee joint once the prosthesis wearer has regained
increased mobility (locking function permanently deactivated).
The 3R93 is especially suited for transfemoral amputees who are able to walk to a limited degree
and who require a high degree of stability.
Locking function
The locking function can be permanently deactivated by the prosthetist (see Section 4.2.1).
With activated locking function (delivery status), the lock mechanism, which is installed in the up-
per joint section, secures the joint in the extended position, and the latch engages.
Flexion release (e.g. for sitting down) is activated by pulling the cable, which is attached to the
cord loop. To do so, the patient either relieves the load on the prosthesis or applies load on the
toes (knee extension moment) while unlocking the joint. Once the joint is unlocked (cable pulled),
the patient can initiate the flexion movement. For safety reasons, activation of flexion release be-
comes more and more difficult with increasing flexion moment.
A hinged plastic flap (Fig. 2, item A) covers the anterior joint space even when the knee joint is in the
maximum flexion position and protects the cosmetic foam cover and fingers from getting jammed.
Braking function
With permanently deactivated locking function, knee stability is achieved through the brake mecha-
nism that blocks the joint in the flexion direction under load.
When load is applied to the heel, the brake responds, stabilises the prosthesis and achieves a high
degree of stability throughout the entire stance phase. The brake also offers the desired security
when walking with a slightly flexed knee joint. The braking effect is adjustable (see Section 4.2.2).
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