4 Function
The knee is a polycentric design comprising pivots connecting a chassis to a carrier via four
link arms. A hydraulic knee control sits within this frame assembly, fitted between the chassis
posterior pivot (rear proximal axis) and the carrier anterior pivot (distal axis).
The device provides increased toe clearance during swing phase as a result of ease of initiation
of free swing and mechanical advantage of the geometry compared to a single axis device, and
short protrusion when sitting.
The device has dual stance control, combining the geometric stability of the polycentric knee
linkage with an adjustable hydraulic yielding support activated from knee extension prior to heel
strike and released by a hyper-extension moment at any time, usually occurring after mid-stance.
The device provides an adjustable hydraulic swing phase control to accommodate variable
cadence.
5 Maintenance
An annual visual inspection is recommended. Check for visual defects that may affect proper
function.
Maintenance must be carried out by competent personnel.
Do not carry out maintenance on this device yourself. Instead, return it to a Blatchford center for
maintenance. If the device is still under warranty, we will loan you another knee unit while we
carry out maintenance.
The user should be advised:
Any changes in performance of this device must be reported to the practitioner.
Changes in performance may include:
• Increase or decrease in knee stiffness
• Instability
• Reduced knee support (free movement)
• Any unusual noise*
* Due to the nature of the hydraulics there may be some slight air noise from the cylinder during the
first few steps. This is not detrimental to the function of the unit and should dissipate quickly.
If symptoms persist, please consult your practitioner.
Storage and Handling
When storing for prolonged periods place the device vertically with trunnion uppermost.
Alternatively and in addition, air management may be assisted by cycling the knee control
several times with the stance resistance switched off (refer to Section 9.3).
Use product packaging supplied.
Cleaning
Use a damp cloth and mild soap to clean the outside surfaces.
DO NOT use aggressive cleansers.
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