Method for injecting contrast media into the vascular system

• US 3,880,138 A
• Filed: 01/21/1974
• Issued: 04/29/1975
• Est. Priority Date: 03/12/1973
• Status: Expired due to Term

• Current Assignee: Lear Romec Corporation
• Original Assignee: George S. Rives, John A. Wootten
• Inventors: Wootten, John A., Rives, George S.
• Primary Examiner(s): Medbery, Aldrich F.
• Application Number:
  US05/434,847
• Time in Patent Office: 463 Days
• Field of Search: 128/218A,DIG.1,2.5R,2A,236,2R,214R,214F 222/59,76
• US Class Current: 600/432
• CPC Class Codes: A61M 5/14546 Front-loading type injectors
• CPC Class Codes: A61M 5/14566 with a replaceable reservoir for receiving a piston rod of the pump
• CPC Class Codes: A61M 5/16854 by monitoring line pressure
• CPC Class Codes: A61M 5/44 having means for cooling or heating the devices or media
• CPC Class Codes: Y10S 128/01 Motorized syringe

Abstract

A method by which fluid is delivered sequentially at more than one rate as desired. Such different flow rates and the duration of time of each flow rate are independently preselected, after which the piston is caused to be automatically sequentially advanced within the syringe at the preselected rates of speed for the preselected periods of time during one cycle of advancement of the piston to obtain the desired different flow rates and duration of time of each flow rate.

Claims

1. A method of injecting a fluid into the vascular system of a mammal comprising the steps of filling a syringe with the desired quantity of fluid to be injected, providing a bolus of said fluid in the vascular system during one cycle by moving a motor driven piston mounted for axial movement within the syringe for expelling such bolus of fluid therefrom, and controlling the movements of such piston to cause the piston to automatically sequentially advance at more than one rate of speed of advance movement within the syringe for different periods of time during such one cycle of advance movement of such piston.

2. The method of claim 1 wherein controls are provided for independently preselecting more than one rate of speed of advancement of the piston within the syringe and the periods of time of each advancement during such one cycle of advancement prior to such advancement, further comprising the step of presetting such controls to control the movements of such piston as aforesaid.

3. The method of claim 1 further comprising the step of stopping and restarting the piston at selected times during such advancement.

4. The method of claim 2 further comprising the step of automatically actuating an X-ray machine after a time delay upon completion of such sequential advancement of such piston.

5. The method of claim 4 further comprising the step of activating the time delay for the X-ray machine whenever the piston reaches the end of its stroke before the preselected time.

6. The method of claim 1 wherein there is a syringe cap and associated seal on the outer end of the syringe, and prior to the step of filling the syringe with the desired quantity of fluid the piston is extended to expel any fluid therefrom and the syringe is disassembled and sterilized, then reassembled except for the syringe cap and associated seal, and the piston is retracted to the desired fluid volume and the syringe is then pointed vertically upwardly to permit the fluid to be poured into the syringe.

7. The method of claim 6 wherein after the syringe has been filled with the desired quantity of fluid, the syringe cap and associated seal are assembled on the outer end of the syringe.

8. The method of claim 1 wherein prior to filling the syringe with the desired quantity of fluid the syringe is checked for current leaks to ground.

9. The method of claim 1 wherein the piston is caused to automatically sequentially advance first at a relatively slow rate for a relatively long period of time and then at a relatively faster rate for a much shorter period of time during such one cycle of advancement of such piston, followed by automatic actuation of an X-ray machine.

10. The method of claim 1 further comprising the step of interrupting such automatic sequential advancement of the piston during such one cycle of advancement of the piston, and controlling the movements of the piston for the remaining portion of the injection cycle.

11. A method of injecting a fluid into the vascular system of a mammal comprising the steps of filling a syringe with the desired quantity of fluid to be injected, such syringe including a motor driven piston mounted for axial movement within the syringe for expelling such fluid therefrom, and controlling the movements of such piston to cause the piston to automatically sequentially advance at more than one rate of speed of advance movement within the syringe barrel for different volumes of each advancement during one cycle of advance movement of such piston and providing controls for independently preselecting more than one rate of speed of advance movement of the piston within the syringe and volumes of each advancement prior to such advancement, further comprising the step of presetting such controls to control the movements of such piston as aforesaid, such piston being caused to automatically sequentially advance first at a relatively slow rate for a relatively long period of time and then at a much faster rate for a much shorter period of time, followed by actuation of an X-ray machine.