Survey of Medical Device Manufacturers and Healthcare Delivery Organisations Reveals Industrys Lack of Confidence and Alignment in Securing Medical Devices. 67 percent of medical device manufacturers and 56 percent of healthcare delivery organisations (HDOs) believe an attack on a medical device built or in use by their organisations is likely to occur over the next 12 months. 80 percent of device makers and HDOs report that medical devices are very difficult to secure. Only 9 percent of manufacturers and 5 percent of HDOs say they test medical devices at least once a year, while 53 percent do not test devices at all.”]