Substitutes for the endocrine pancreas
1981
: Since it is generally accepted that a tight metabolic control might prevent the chronic complications of diabetes mellitus, several systems have been developed in which insulin is administered in a manner that mimicks the characteristics of insulin secretion. 1) In the so-called closed-loop systems, insulin delivery is regulated by the concomitant plasma glucose level. These systems, which involve continuous measurement of plasma glucose concentration are not to date implantable and have been used so far only for short-term studies. 2) By contrast, in the "open-loop systems", no glucose sensor is needed and insulin delivery is pre-programmed to achieve a constant basal infusion with peaks of insulin delivery during the meal periods. These systems have been used in man for several months. The present achievement and limitations of both kinds of systems are discussed in this review.
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