Pump particularly useful in respirator apparatus and exhalation

Details Pump particularly useful in respirator apparatus and exhalation Pump particularly useful in respirator apparatus and exhalation

1995-10-23

1997-11-04

Thorpe, Timothy

Pumps

Expansible chamber type

Having separate noncyclic valve

12820524, 12820418, 12820513, A61M 1600, A61M 1620

Patent

active

056832320

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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patent: 5107830 (1992-04-01), Younes

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