Össur 4SEAL LINER Manual Del Usuario página 6

Criteria that indicate that the liner is too tight can be, for example:
• the liner shows excessive constriction in the area of the seals
• after a short period of wear, the liner causes significant redness in the area of the seals or on the edges (Fig. 5)
• the user feels pain or numbness
If any of these indicators exist, change the size of the liner and/or contact Össur.
Preparation for making a mould:
Figures 6 + 7
Mark the planned socket trim-line on the liner and trim accordingly. (Fig. 6) We recommend using wave-cut
scissors. The wave cut increases the elasticity of the upper edge, thus increasing the wearing comfort.
Keep the liner on the residual limb for a while in order to be sure that the user feels comfortable with it.
Because of the Easy Glide PLUS coating, sealing the cut edge with silicone adhesive is not necessary.
Make sure that the distal end of the liner is centered on the residual limb and that the seals are in the correct
position, perpendicular to the residual limb axis. (Fig. 7)
Making a mould:
Figures 8, 9
Take the normal length, width and circumferential measurements and record them. In order to obtain an optimum
fit and suction, it is imperative to precisely determine the circumference dimensions. They serve later as a basis for
further reductions in volume. (Fig. 8)
Note: In the area of the seals, circumferential measurements absolutely must be made between the seals. (Fig. 9)
Draw the usual guide lines and markings for circumferential measurements.
When making the mould, be sure to accurately shape the area of the seals.
Modelling:
Figures 10, 11, 12
Model the socket brim to the preferred shape. The 4Seal liner is suitable for many different socket types; however,
the socket should have full contact. Depending on the socket type, certain areas of the cast may need to be built
up, but this should not be in the seal area, since this can impair the function of the seals. (Fig. 10)
Smooth down the cast profile completely in the area of the seals. Neither a volume increase nor a significant
reduction in volume is necessary in this area.
Similarly, ensure that the cast is as smooth as possible, since a smooth interior surface to the socket is especially
important in order to obtain a good seal. To achieve a smooth surface on the plaster model, we recommend the
use of fine abrasives, followed by use of silicone spray. (Fig. 11)
Estimate the necessary volume reduction, based on the measurements taken. We recommend a reduction of 1-3%
proximally extending to 0% distally. (Fig. 12)
Since the volume is one of the most important factors in the fit of the socket, please pay particular attention to this
part of the rectification process.
Putting on the prosthesis:
Figure 13
Do not use alcohol spray or other aids such as petroleum jelly when putting on the socket.
Test criteria:
Create a socket in the usual way. All PETG test socket materials, laminated socket and a number of thermoplastic
inner socket materials with a smooth surface are suitable.
In order to ensure long-term functioning of the seals, we recommend the following socket materials:
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