Which of the following best describes invasive monitoring devices?

Invasive monitoring devices are specifically designed to assist in the continuous or periodic measurement of physiological parameters by being inserted directly into the body. This characteristic allows for the collection of more accurate and intimate data regarding a patient's internal physiological state compared to non-invasive methods. For example, invasive devices like arterial catheters or central venous catheters provide vital information about blood pressure, blood gases, and other important metrics directly from within the bloodstream.

The other options do not accurately represent invasive monitoring devices. Devices that monitor without penetrating the body are categorized as non-invasive. The statement about lower risks does not apply universally, as invasive devices often carry higher risk due to the potential for infection, bleeding, or other procedural complications. Lastly, devices that only measure external body temperature are also non-invasive and do not fall under the category of invasive monitoring devices.