Robert H Farmer

US Patent:

43845762, May 24, 1983

Filed:

Feb 13, 1981

Appl. No.:

6/234306

Inventors:

Robert B. Farmer - Boulder CO

Assignee:

Thompson Respiration Products, Inc. - Boulder CO

International Classification:

A61M 1600

US Classification:

12820518

Abstract:

A portable positive displacement respirator/ventilator is provided for both a pressure sigh and a volume sigh of predetermined duration and frequency by providing a variable length crank arm connecting a piston through a connecting rod by mounting the connecting rod on a circular toothed gear, pivoting the gear for movement at its center and driven on its outer edge with a separate motor driven pivot gear which when moved relocates the effective length of movement of the point of attachment of the connecting rod thereby changing the volume swept by the piston for the same arc of reciprocal movement of the larger circular toothed gear enabling both a volume change or a volume sigh with the device. A cooperating multiplicity of adjustable pressure regulating valves where at least one can be intermittently closed during the operation of the device regulates ventilation pressure or breathing pressure and sigh pressure.

US Patent:

D3330150, Feb 2, 1993

Filed:

Dec 2, 1991

Appl. No.:

7/801175

Inventors:

Robert B. Farmer - Boulder CO
R. Scott St. John - Golden CO

Assignee:

Lifecare International, Inc. - Lafayette CO

US Classification:

D29 8

US Patent:

52995992, Apr 5, 1994

Filed:

Sep 17, 1992

Appl. No.:

7/946897

Inventors:

Robert B. Farmer - Boulder CO
John T. Shackelford - Longmont CO

Assignee:

Lifecare International, Inc. - Lafayette CO

International Classification:

F16K 11085
A61H 3102

US Classification:

13762522

Abstract:

A valving arrangement primarily designed and intended for use in a negative pressure ventilator system. The valve arrangement has a uniquely designed valve that enables the ventilator to perform a number of operations simply by manipulation of a single, one-piece valve member within a valve housing. The valve housing has multiple inlets and outlets and the valve member can be rotated within it to present a variety of pressure cycles to the patient. In the preferred manner of operation, the present invention selectively applies negative and positive pressures to the patient during different portions of the cycle. In this regard, the valve member is structured so that negative and positive pressures are never at the same time delivered to the patient. The valve arrangement is compact and lightweight. It is also functionally superior to prior designs that can only supply whatever pressure is being created by the blower.