"Passy-Muir valve"
Expected headings
"Vascular access devices"
"Neural stimulators"
"Gastrointestinal tract"
"Respiratory tract"
"Spine"
"Other devices"
"Medical devices in the head and neck are regularly seen by radiologists on plain film, CT and MRI. They include devices which pass through the neck into the chest and stomach or ascend to/into the head."