Pump particularly useful in respirator apparatus and exhalation valve assembly thereof
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United States of America Patent
Stats
-
Nov 4, 1997
Issued Date -
N/A
app pub date -
Oct 23, 1995
filing date -
Feb 28, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A reciprocating pump particularly useful in ventilator apparatus includes a piston reciprocatable axially within a cylinder and dividing its interior into an inlet chamber and an outlet chamber, a wall fixed within the inlet chamber, and a drive housing fixed to the wall. The drive housing includes a motor, a rotor rotatable by the motor, a nut rotatable within the drive housing, and a screw threadedly coupled at one end to the nut and fixed at its opposite end to the piston. The piston is substantially unrestrained for axial and rotary movement such that forward and reverse rotation of the nut by the motor reciprocates the screw and the piston axially of the cylinder, and also permits the screw and the piston to rotate with respect to the cylinder to thereby even out wear between the piston and cylinder.
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