Maintenance of an Aneroid Sphygmomanometer | 合法醫療器材資訊網

Itconsistsofadialwhichnormallyrisesto300mmHgandathinbrasscorrugatedbellowsinside.Thereisashaftwhichconnectstwopinsatrightanglestoeach ...

by Mr Mike Yeats Derriford Hospital, Plymouth, UK. Reproduced with permission from Update in Anaesthesia[1]

The first article in this series described the maintenance of a  mercury sphygmomanometer, this article describes the maintenance of an aneroid blood pressure apparatus. Aneroid means, in Greek, operating without liquid or containing no fluid. Aneroid blood pressure gauges are generally smaller than mercury ones but they are easily damaged and can go out of calibration without detection.

A common type of aneroid apparatus is shown in figure 1.

It consists of a dial which normally rises to 300mmHg and a thin brass corrugated bellows inside. There is a shaft which connects two pins at right angles to each other; one of these rests on the bellows, the other is inside a concave sided triangle which ...