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=== How to Make a Pressure Relief Cushion Base === The following instructions provide a cushion of dimensions 400 mm wide x 400 mm deep x 50 mm high. The Ischial Tuberosity Well is 200 mm wide x 200 mm deep x 35 mm high. This cushion would be suitable for a wheelchair user with a seat width of 400 mm. Adapt the dimensions to suit the size of each wheelchair user as described in the box below. ==== Mark Out the Cut Lines on the Firm Foam: (Fig.5) ==== * Start with a piece of firm foam 400 mm x 400 mm x 50 mm; * The centre of the seat bones well must be on the centre line of the cushion; * For this size cushion, the Ischial Tuberosity Well should measure 200 mm x 200 mm x 35 mm; * Draw the cut lines with a dark coloured marker on all six sides of the base foam. [[File:Image dimension.png|thumb|center|199x199px|Fig.5 Line Cut Outs]] ==== Dimensions of Seat Bones Well (Fig.6) ==== Adjust the dimensions of the cushion and the seat bones well to suit individual wheelchair users as follows: *Seat Bones Well Width = ½ the wheelchair user’s seat width or 200 mm (whichever is less) [a]; * Seat Bones Well Depth (front to back) = ½ the wheelchair user’s seat width or 200 mm (whichever is less) [b]; * Seat Bones Well Height = 35 mm for adults and 20–25 mm for children [c]. [[File:Seat bones dimensions.png|thumb|center|199x199px|Fig. 6 Seat Bones Well Dimensions]] ==== Cut Out Seat Bones Well ==== Use a sharpened hacksaw blade or long knife. Use long slow strokes, cutting mostly when pulling to improve control. * First cut through the back of the cushion to the depth of the seat bones well. (Fig.7) * Then slice out the seat bones well. (Fig.8) * Glue back into place the two “flaps” left on either side of the seat bones well. Allow the glue to set until not completely dried and slightly sticky to touch. Then press the foam together. (Fig.8) * Cut off (bevel) the corners inside the seat bones well. (Fig.10) * For a slung seat cushion: make an angled cut/bevel on both sides of the base/underside. (Fig.11) <div class="row"> <div class="col-md-4">[[File:Cut out seat pic 1.png|167x167px|center|thumb|Fig.7]]</div> <div class="col-md-4">[[File:Cut out seat pic 2.png|167x167px|center|thumb|Fig.8 ]]</div> <div class="col-md-4">[[File:Cut_out_seat_pic_3.png|167x167px|center|thumb|Fig.9]]</div> </div> <div class="row"> <div class="col-md-4">[[File:Cut of bevel inside the seat image.png|167x167px|center|thumb|Fig.10]]</div> <div class="col-md-4">[[File:Slung seat cushion.png|167x167px|center|thumb|Fig.11]]</div> </div> ==== Place the Top Foam Layer on Top of the Cushion ==== * Both the base and top layer are placed in the cushion cover together. * The two layers do not need to be glued together. * If the top layer becomes soiled or worn, it can be washed and dried, or replaced. * A lift can be added within the cover to increase the depth of the seat bones well. {{#ev:youtube|watch?v=-NbkTJ6QZf8}}

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