4
2. General Specification (Fig 2)
2.1 Width X Thickness X Height=48X74.5X207 (mm)
2.2 Weight: 870g
2.3 Knee flexion angle:135
°
2.4 Weight limited:
≤
100kg
3. Description
5. Adjustments for Swing and Stance Phase
The 1320A Pneumatic Single Axis Knee with Weight Activated Lock is a modular knee joint with stance phase
friction brake activated by weight bearing, and pneumatic swing control, designed to be used exclusively for
the prosthetic fitting of lower extremities. The characteristics of this pneumatic knee offers good function for
walking speed.
The joint is best suited for above-knee amputees who require a high degree of stability. The brake increases
the stability of the knee and compensates for weak musculature.
Approved for patient weight up to 100 kg
(220 lbs).
3.1 Construction and Function (Fig 1)
The Swing Block (4) is connected to the Upper Joint Section (6) through the Swing Axis (9) and with the Lower
Joint Section (12) through the Knee Axis (2). The slotted Swing Block (4) accepts the slotted Brake Bushing
(3) which surrounds the knee axis. During weight bearing, pressure on the Upper Joint Section (6) and the
Plastic Block(7) transfers the load on the Swing Block(4), which increases the resistance between the knee
axis and brake bushing, increasing the stability of the knee.
In the unloaded condition, the Compression Spring (8) and the elasticity of the Swing Block (4) release the
brake effect.
4. Alignment Recommendations (Fig 3)
NOTE:
Prior to adjusting knee joint, please read the following instructions.
The
1320A
Modular Knee comes adjusted from the factory to help expedite the fitting process, but should
be adjusted according to each individual’s needs. Stance and swing phase are adjusted individually.
5.1 Adjusting Stance Phase Brake Sensitivity/Swing Friction (Fig 4)
Adjust the Pressure Block (7) Set Screw (5) between the Swing Block (4) and the Upper Joint Section (6)
to adjust the brake sensitivity between the Knee Axis (2) and Brake Bushing (3) (Use a 3 mm hex head
wrench)
