ROSS H POTTER
Engineers in Oakmont, PA
License number
Pennsylvania PE056310
Category
Engineers
Type
Professional Engineer
Address
Address
Oakmont, PA 15139
Professional information
Processor-Controlled Angiographic Injector Device
US Patent:
4854324, Aug 8, 1989
Filed:
Feb 24, 1988
Appl. No.:
7/161434
Inventors:
Alan D. Hirschman - Glenshaw PA
David M. Reilly - Glenshaw PA
Ross H. Potter - Oakmont PA
John A. Stulen - Pittsburgh PA
Eric M. Toft - Pittsburgh PA
John G. Clark - Pittsburgh PA
David M. Reilly - Glenshaw PA
Ross H. Potter - Oakmont PA
John A. Stulen - Pittsburgh PA
Eric M. Toft - Pittsburgh PA
John G. Clark - Pittsburgh PA
Assignee:
Medrad, Inc. - Pittsburgh PA
International Classification:
A61M 3700
US Classification:
128655
Abstract:
An angiographic injector device for use in x-ray photography for delivering contrast media to a patient at controlled rates and pressures. A processor elicits injection parameters from an operator or a pre-programmed injection module, and on the basis of the injection parameters, calculates appropriate control signals for use in a closed-loop servo system to actuate the plunger of a syringe containing the contrast media. Injection parameters includes flow rate, volume, duration, pressure limit and rise-fall time of flow rate. The device also includes control circuits for inhibiting the injection device in response to a contrast media pressure limit, failure in the processor or injection control system, or upon reaching a predetermined volume of injected media. A mechanical stop member cooperates with the control circuit for blocking movement of the syringe plunger upon reaching the predetermined injected volume. Further, the device includes a self-test feature for checking the status of operational components thereof and a self-calibration feature for calibrating the servo system and position monitors.