Catherine A Anderson

US Patent:

49305190, Jun 5, 1990

Filed:

Sep 9, 1985

Appl. No.:

6/774222

Inventors:

Catherine A. Anderson - Stillwater MN
Jay O. Millerhagen - Little Canada MN

Assignee:

Medical Graphics Corporation - St. Paul MN

International Classification:

A61B 5205

US Classification:

128671

Abstract:

A method of graphically displaying cardiopulmonary function data by providing a plurality of axes radially projecting from a common point of origin, there being one such axis for each cardiopulmonary parameter to be plotted, each axis having scale markings thereon whereby the normal value for each parameter will lie an equal distance from said point of origin, and straight line segments connected between said normal values on adjacent axes will form a generally regular polygon. The cardiopulmonary function data to be displayed are then plotted on the same appropriate axis and to the same scale such that deviations of any such data from normal will result in an irregular polygon when the segments are joined between plotted values on adjacent axis. Deviations of the irregular polygon from the regular polygon thus provides a clinician with a readily visible display of possible cardiopulmonary disfunction.

US Patent:

44401779, Apr 3, 1984

Filed:

Dec 16, 1981

Appl. No.:

6/331247

Inventors:

Stephen T. Anderson - Stillwater MN
Catherine A. Anderson - Stillwater MN

Assignee:

Medical Graphics Corporation - Shoreview MN

International Classification:

A61B 508

US Classification:

128719

Abstract:

A system for measuring the ventilatory response of the human respiratory system to increased levels of CO. sub. 2 and/or decreased levels of O. sub. 2. Measured concentrations of CO. sub. 2 are introduced into an infant's lungs and the inspired and expired air is passed through a pneumotachograph for developing various electrical analog signals relating to flow. Samples of the expired air are delivered to CO. sub. 2 and O. sub. 2 analyzers. The resulting electrical analog signals produced by these devices represent inspiratory and expiratory flow, and the CO. sub. 2 and the O. sub. 2 levels in the expired air. They are applied to a waveform analyzer containing an analog to digital converter and a microprocessor system which is programmed to discriminate between normal breathing patterns and irregular patterns. The microprocessor also computes inspiratory and expiratory tidal volume, ventilation (measured in liters per minute), breathing frequency, inspiratory, expiratory and total times of a preceding breath, minimum CO. sub. 2 and O. sub. 2, peak CO. sub. 2 and O. sub.

US Patent:

44637640, Aug 7, 1984

Filed:

Sep 29, 1981

Appl. No.:

6/306607

Inventors:

Stephen T. Anderson - Stillwater MN
Catherine A. Anderson - Stillwater MN
Terrance J. Kapsen - Minneapolis MN

Assignee:

Medical Graphics Corporation - Shoreview MN

International Classification:

A61B 508

US Classification:

128719

Abstract:

A cardiopulmonary exercise system for real-time, breath-by-breath acquisition, analysis, display and printing of an individual's physiologic parameters. A microprocessor based waveform analyzer receives inputs from a CO. sub. 2 analyzer, an ECG monitor, an O. sub. 2 analyzer, and a pneumotachograph, and, optionally, can also connect a cycle ergometer, a treadmill, a cardiac stress system, and an ear oximeter. The waveform analyzer provides output data to a host central processor unit to which a CRT display, a graphics copier or hard-copy printer may be connected for providing medical data for assessment of an individual's heart and lungs, on a real-time basis whereby the level of fitness or underlying organic defects which may effect the cardiopulmonary system can be determined. The pneumotachograph, CO. sub. 2 analyzer and O. sub.