Access your potential
ACCESS YOUR POTENTIAL
Waves Liners
a revolution for pear-shaped limbs
Enhanced stretch
The Waves pattern artificially increases the circumference to have more textile material, thereby increasing the stretchability of the liner.
Smooth inside surface
The waves pattern are only on the outside surface. The inside surface remains smooth and continuous.
Waves = Donning enabler
The stretchy segment with Waves can more easily go over the prominent distal end when donning the liner.
For what indications ?
Ankle-Ex.
Symes, Chopart, Pirogoff... All these types of amputations leave a more prominent distal end and a narrower ankle segment. Waves make liners viable form such amputation types.
Feet
Borggreve, Van Ness, PFFD... If there's a foot, the ankle segment of the liner will struggle to stretch enough to roll over the heel during donning. Waves on the ankle are then a great feature.
Knee-Ex.
The femoral condyles are often the largest segment of the limb. In some boundary cases, compensation is not feasible, and waves are the only viable option.
Atrophied thigh
The narrow proximal segment of the liner might have trouble going over the knee. Waves can make it stretchier and facilitate liner donning.
Congenital
Congenital limbs often come with protruding areas, and pear-shapes, making Waves Liners an option of choice to facilitate / enable donning.
The two classical types of custom liners for pear-shaped limbs:
Type #1:
Fully-Compensated Liner
Type #2:
Non-Compensated Liner
Once put on the limb, the liner fully compensates the protruding distal segment.
Thickness is applied so the [limb + liner] shape is cylindrical, and can enter a classical prosthetic socket (no need for boa system / soft socket / modular openings). Unlike any other type of custom-liner for pear-shaped limbs, fully compensated liners enable the use of vacuum suspension.
The liner follows the limb shape, but the thicknesses are not designed to compensate the pear shape.
Similarly as with off-the-shelf liners, applied thickness can be constant or tapered.
For users who require high silicone durometer, fully compensated liners with their thick gel layer can be problematic. In such cases, non compensated liners can be a great option
Fully compensated liners can be used with classical socket types:
1: Roll
Liner On
2: Enter
Socket
Non-compensated liners must be used with modular sockets:
(or alternative, e.g. soft socket)
1: Roll
Liner On
2: Enter
Socket
3: Close
Socket
Both liner types are however limited by factors which make liner donning harder:
Wall thickness
When the pear-shape is too-extreme, the thickness required to compensate it can become too important. A thick liner wall makes this segment of the liner less elastic, and thus makes the liner more difficult to roll on.
For certain pear-shaped limbs, a fully compensated liner is simply impossible to don.
Textile stretch limit
The textile cover we use has a stretch limit of about 30%. If a segment of the liner has a circumference 30% smaller than an area of the limb it is supposed to roll over during donning, the textile will simply block.
With non-compensated liners, textile stretch limit can make liners impossible to don.
To overcome these limits, 2 more liner types:
Type #3:
Half Compensated Liner
A partial compensation is applied in the narrowest segment of the limb. This allows to keep reasonable wall thickness, whilst increasing outer circumference to stay clear of the 30% textile stretch limit.
For some pear-shaped limbs where neither a fully-compensated nor a non-compensated liner can work, half-compensated liners can help find a more optimal point where the required donning force is lowered.
Type #4:
Waves Liner by MotionTech
The outside surface of the liner features a wave pattern in the narrowest segment of the limb to increase the amount of textile material, thereby increasing the stretch potential of the liner in that segment.
Thanks to MotionTech's Waves technology, even limbs with extreme degrees of pear-shape can now be fitted.
Waves: the go-to solution for easy donning
What's the best liner type for my patient ?
Calculate the stretch percentage
Stretch =
(Max - Min)
Min
}
No
problem
Not necessary
Recommended
Difficult
to don
Donning
impossible
Uncharted
territory
Stretch
0%
10%
15%
20%
30%
40%
60%
80%
100%
Fully-
Compensated
Half-
Compensated
Non-
Compensated
Waves
No
problem
Difficult
to don
Donning
impossible
No
problem
Difficult
to don
Donning
impossible
* The table above is a simplification; our experts can advise you on a case-by-case basis.
Compare liner types for pear-shaped limbs
Non-
Compensated
Half-
Compensated
Fully-
Compensated
Weight
Vacuum suspension possible ?
Modular
socket
needed ?
Easy to
don and
doff ?
Anatomic
suspension
possible ?
Waves
No
Yes
Yes
No
Yes
Light
Medium
Somewhat
possible
Yes
No
No
Heavy
Not
always
Yes
No
Light
Yes
Yes
Not
always
Not
always
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