System and Method for Delivering a Target Volume of Fluid

Abstract

A method for delivering a target volume of fluid to a destination is provided. The method includes delivering a first volume of fluid to the destination in increments each having approximately a first incremental volume, the first volume of fluid being less than the target volume and delivering a second volume of fluid to the destination in increments each having approximately a second incremental volume, the second incremental volume being less than the first incremental volume, such that the sum of the first volume and the second volume is approximately equal to the target volume.

1 . (canceled) 
     
     
         2 . A method for operating a fluid control module of a pumping system comprising a controller to control operation of a pump cassette to deliver a target volume of a desired mixture ratio of a first medical fluid and a second medical fluid, the method comprising:
 a. pumping, under control of the fluid control module, the first medical fluid in a first incremental volume using a first pump chamber of the pump cassette, wherein the first incremental volume is less than the target volume;   b. pumping, under control of the fluid control module, the second medical fluid in the first incremental volume using a second pump chamber of the pump cassette;   c. receiving data associated with the first and second pump chambers with the controller indicative of a volume of the first medical fluid pumped to the source by the first pump chamber and a volume of the second medical fluid pumped to the source by the second pump chamber;   d. repeating steps (a) and (b) until in step (c), a volume of the first medical fluid pumped to the source by the first pump chamber meets or exceeds a first predetermined volume based on the desired mixture ratio, or a volume of the second medical fluid pumped to the source by the second pump chamber meets or exceeds a second predetermined volume based on the desired mixture ratio;   e. determining with the controller after step (d), if either the volume of the first medical fluid pumped to the source by the first pump chamber is less than the first predetermined volume, or the volume of the second medical fluid pumped to the source by the second pump chamber is less than the second predetermined volume, and, if so, under control of the fluid control module, repeating either step (a), if the volume of the first medical fluid pumped to the source is less than the first predetermined volume, or step (b), if the volume of the second medical fluid pumped to the source is less than the second predetermined volume, until both the volume of the first medical fluid pumped to the source by the first pump chamber meets or exceeds the first predetermined volume, and the volume of the second medical fluid pumped to the source by the second pump chamber meets or exceeds the second predetermined volume; and   f. repeating steps (a) through (e) until the target volume has been delivered.   
     
     
         3 . The method according to  claim 2 , wherein the first predetermined volume of the first medical fluid plus the second predetermined volume of the second medical fluid equals the target volume minus a finish volume. 
     
     
         4 . The method according to  claim 2 , wherein the data received by the controller in step c comprises pressure data associated with the first and second pump chambers. 
     
     
         5 . A method for operating a fluid control module of a pumping system comprising a controller to control operation of a pump cassette to deliver a target volume of a desired mixture ratio of a first medical fluid and a second medical fluid, the method comprising:
 a. pumping, under control of the fluid control module, the first medical fluid in a first incremental volume using a first pump chamber of the pump cassette, wherein the first incremental volume is less than the target volume;   b. pumping, under control of the fluid control module, the second medical fluid in the first incremental volume using a second pump chamber of the pump cassette;   c. receiving data associated with the first and second pump chambers with the controller indicative of a volume of the first medical fluid pumped to the source by the first pump chamber and a volume of the second medical fluid pumped to the source by the second pump chamber;   d. repeating steps (a) and (b) until in step (c), the volume of the first medical fluid pumped to the source by the first pump chamber meets or exceeds a first predetermined volume based on the desired mixture ratio, or the volume of the second medical fluid pumped to the source by the second pump chamber meets or exceeds a second predetermined volume based on the desired mixture ratio;   e. determining with the controller after step (d), if either the volume of the first medical fluid pumped to the source by the first pump chamber is less than the first predetermined volume, or the volume of the second medical fluid pumped to the source by the second pump chamber is less than the second predetermined volume, and, if so, under control of the fluid control module, repeating either step (a), if the volume of the first medical fluid pumped to the source is less than the first predetermined volume, or step (b), if the volume of the second medical fluid pumped to the source is less than the second predetermined volume, until both the volume of the first medical fluid pumped to the source by the first pump chamber meets or exceeds the first predetermined volume, and the volume of the second medical fluid pumped to the source by the second pump chamber meets or exceeds the second predetermined volume;   f. repeating steps (a) through (e) until a total volume of the first and the second medical fluids has been delivered that equals the target volume minus a finish volume; and   g. repeating steps (a) through (e), except in steps (a) and (b), pumping in a second incremental volume which is less than the first incremental volume and less than the finish volume.   
     
     
         6 . The method according to  claim 5 , wherein the second incremental volume is ⅓ of the finish volume. 
     
     
         7 . The method according to  claim 5 , wherein the fluid control module operates a first valve between a source of the first medical fluid and the first pump chamber, and operates a second valve between a source of the second medical fluid and the second pump chamber to adjust the first or second incremental volume pumped by the first and second pump chambers. 
     
     
         8 . The method according to  claim 5 , wherein the second incremental volume is approximately 3 ml or less.