WILL & DENI MCINTYRE / SCIENCE PHOTO LIBRARY WILL & DENI MCINTYRE / SCIENCE PHOTO LIBRARY
Insulin pump. This battery-driven insulin pump connected to a man's abdomen delivers a continual supply of the hormone insulin by subcutaneous (below the skin) injection. The device can be programmed to vary the dose at different times, such as prior to eating. Regular injections of insulin are needed in diabetes, where the hormone is absent from the patient's bloodstream. Without insulin the body fails to take up glucose from the blood, leading to coma and death. With modern treatment and sensible self-monitoring, however, diabetics can lead a near-normal life.
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