Some links that seem to work:
https://www.healthcare.uiowa.edu/Mar...rt_PIllows.pdf
https://createtodonate.org/how-to-ma...o-port-pillow/
The basic premise seems to be tiny pillows (4 x 6 to 5 x 9) that one can attach to a seat belt.
The main differences I could see was how "fancy" the fasteners were.
search for "Chemo port pillows" and that brings up a lot of links