Welch Allyn, Inc.

Andrew M Robottom

John A Lane

Scott Andrew Martin

Braxton L Lathrop

William J Smirles

An automatic blood pressure monitor having a housing containing a first water and air tight chamber and a second air supply chamber, the chambers being separated by a common wall. Pneumatic equipment is mounted in the first chamber having a flow circuit for inflating and deflating a blood pressure cuff. A filtering unit is mounted in the common wall for retaining particulate material and moisture that is exchanged between the two chambers. The flow circuit has an air inlet port and an air exhaust port which are both located adjacent to the filter contained in the filtering unit whereby particulate material and moisture drawn into the flow circuit is retained upon the filter during inflation cycle and the particulate material and moisture retained on the filter is blown back into the air supply chamber during the deflation cycle. A drain is mounted in the floor of the air supply chamber through which particulate material and moisture collected in the chamber is discharged to the surrounding ambient. A restricted opening is provided in an outer wall of the air supply chamber which allows ambient air to enter the chamber through a tortuous path of travel.

Filter for blood pressure monitor

A flow system for use in a monitor for measuring blood pressure that automatically configures the flow path of the system when either a single lumen cuff or a dual lumen cuff is coupled to the monitor.

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Beaverton, OR, United States of America

Andrew M Robottom