Rapid infusion system

• US 6,942,637 B2
• Filed: 03/06/2003
• Issued: 09/13/2005
• Est. Priority Date: 09/29/1999
• Status: Expired due to Term

• Current Assignee: Smisson-Cartledge Biomedical LLC
• Original Assignee: Smisson-Cartledge Biomedical LLC
• Inventors: Cartledge, Richard G., Smisson, Hugh F. III, Brown, Jeffery O.
• Primary Examiner(s): MENDEZ, MANUEL A
• Application Number:
  US10/383,117
• Publication Number:
  US 20040059295A1
• Time in Patent Office: 922 Days
• Field of Search: 604/65, 604/66, 604/67, 604/131, 604/260, 604/251, 604/252, 604/253, 128/DIG.12, 128/DIG.13
• US Class Current: 604/67
• CPC Class Codes: A61M 1/02 Blood transfusion apparatus blood infusion by syringes A61M5/14
• CPC Class Codes: A61M 2205/12 with interchangeable cassettes forming partially or totally the fluid circuit
• CPC Class Codes: A61M 5/1411 Drip chambers A61M5/162, A61M5/1689, A61M5/40 take precedence
• CPC Class Codes: A61M 5/142 Pressure infusion, e.g. using pumps
• CPC Class Codes: A61M 5/14232 Roller pumps
• CPC Class Codes: A61M 5/14244 adapted to be carried by the patient, e.g. portable on the body
• CPC Class Codes: A61M 5/365 Air detectors A61M5/1684 takes precedence; in extracorporeal blood circuits A61M1/3626
• CPC Class Codes: F04B 43/1253 by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing

Abstract

A rapid infusion system for the intravenous delivery of fluids at standard and rapid flow rates. The system includes a pump assembly, a drive assembly to power the pump, and a fluid containment system that keeps the infused fluid out of direct contact with the pump assembly and that is preferably disposable and removable. In one embodiment the drive assembly includes a differential drive that interacts with more than one motor. In one embodiment, the pump assembly includes a roller pump and the pump chamber is a collapsible, preformed tube that is preferably attached to a pump cartridge frame. Optionally, the system includes a self-leveling drip chamber and the fluid containment system is disposable and includes a pump cartridge containing the drip chamber and the pump chamber, I.V. tubing, outlet infusion tubing, and a heater cartridge.

Claims

1. A rapid infusion system for delivering infusium into a patient comprising:

a. an infusium tubing;

b. means for imparting motion to infusium by contact with the infusium tubing;

c. a differential output shaft assembly comprising;

i. an output shaft in communication with the means for imparting motion to the infusium;

ii. a differential assembly in mechanical communication with the output shaft;

iii. a first speed motor assembly in mechanical communication with the differential assembly; and

iv. a second speed motor assembly in mechanical communication with the differential assembly.

2. The rapid infusion system of claim 1, wherein the means for imparting motion to the infusium is a roller pump head.

3. The rapid infusion system of claim 2, wherein the roller pump head comprises two pivot arm assemblies.

4. The rapid infusion system of claim 3, wherein the two pivot arm assemblies are mounted on the roller cover 180 degrees apart.

5. The rapid infusion system of claim 3, comprising more than two pivot arm assemblies.

6. The rapid infusion system of claim 1, wherein the system is capable of delivering infusium to a patient at rates of between 20 cc/hour to 1,500 cc/minute.

7. The rapid infusion system of claim 1, wherein the first speed motor is a stepper motor.

8. The rapid infusion system of claim 1, wherein the second speed motor is capable of operating the output shaft at a faster rate than the first speed motor.

9. The rapid infusion system of claim 1, further comprising a third speed motor in mechanical communication with the differential assembly.

10. The rapid infusion system of claim 1, further comprising a controller in communication with the first and second speed motors to facilitate a smooth transition during a change in speed of the output shaft.

11. The rapid infusion system of claim 1, further comprising a rotation sensor to monitor revolutions of the output shaft.

12. The rapid infusion system of claim 1, further comprising a processor capable of controlling the speed of the first and second motors.

13. The rapid infusion system of claim 1, wherein the differential assembly comprises a yoke, a first bevel gear in communication with the first speed motor, a second bevel gear in communication with the second speed motor, and a pair of spider gear assemblies each having a bevel gear that transfers force from the first or second motors to the output shaft.