Noise damping system for an automatic blood pressure gauge

摘要

A noise damping system for use in connection with an automatic blood pressure measuring device. The system includes a manifold divided into two expansion chambers in fluid communication with one another by way of a chamber port. The pressure waves and acoustic noise generated by a pump and modulated valves are attenuated by expanding in one chamber against a resistance caused by the chamber port and by expansion in the second chamber against a resistance caused by a manifold inlet/outlet port leading to the ambient environment.