Sometimes single and sometimes double, mainly depending on what work.
Medical devices are instruments, equipment, apparatus, in vitro diagnostic reagents and calibrators, materials and other similar or related items used directly or indirectly in the human body, including the required computer software.
Medical devices include medical equipment and medical consumables.
Utility is obtained primarily by physical and other means, not by pharmacological, immunological or metabolic means, or is involved but only in an ancillary manner.
Purposes are the diagnosis, prevention, monitoring, treatment, or alleviation of disease; the diagnosis, monitoring, treatment, alleviation, or functional compensation of injury; the examination, replacement, regulation, or support of physiological structures or processes; the support or maintenance of life; the control of pregnancy; and the provision of information for medical or diagnostic purposes through the examination of samples from the human body.