BLOOD PRESSURE MEASURING APPARATUS WITH CLOSED AIR SYSTEM

摘要

A closed air system includes a reservoir and inflatable cuff arranged to block off blood flow in a portion of a person's circulatory system when inflated by air from the reservoir. An outlet tube connected to a pump passes air from the reservoir to the inflatable cuff and a single valve in a return tube from the cuff to the reservoir permits pressure to be gradually decreased. A pressure transducer provides a feedback signal to the valve to control the rate of pressure drop and maintain it substantially constant all to the end that a doctor can more quickly and accurately take a patient's blood pressure.