| 摘要 |
A medical vacuum regulator (10) with a solenoid regulating valve (20) and a comparator (22) for electrically, automatically controlling the solenoid regulating valve (20) to intermittently open and close to achieve a preselected regulated vacuum (v) which is continuously provided or in intermittent mode decreases during a relaxation period (35) to atmosphere (30) and automatically increases during a ramp period (29) of a vacuum cycle (21) to prevent vacuum surge trauma to a patient (14). The regulating valve (20), in addition to regulating the vacuum during the vacuum cycle (21), continuously vents the system to atmosphere (30) when a patient venting solenoid valve (48) vents the patient (14) to atmosphere (30) to reduce the load on a vacuum pump (12). The continuous and intermittent modes of operation are selected by a mode selection circuit (36) with means for maintaining it in its selected state during a period of temporary power loss. |
