Fluid injector system volume compensation system and method

Patent metadata

Field	Value
Publication number	US-2023069601-A1
Application number	US-202218048931-A
Country	US
Kind code	A1
Filing date	Oct 24, 2022
Priority date	Aug 31, 2017
Publication date	Mar 2, 2023
Grant date	—

Abstract

A system and method for correcting a volume of fluid delivered by a fluid injector during an injection procedure is described. The method included determining and compensating for a volume factor associated with compliance of the fluid injector system and correcting for the volume by one of over-driving the distance that the drive member travels in a fluid reservoir, under-driving the distance that the drive member travels in the fluid reservoir, or lengthening or shortening a fluid delivery time.

First claim

1 - 20 . (canceled)

21 . A method for correcting a volume of fluid delivered by a fluid injector system during an injection procedure, the method comprising:
determining a fluid volume of a first fluid in at least one fluid reservoir of the fluid injector system; determining a pressure at which a first programmed volume of the first fluid is to be injected; calculating a first system volume compliance of the at least one fluid reservoir, one or more fluid injector mechanical components associated with the fluid injector system, and one or more tubing system components based on: the volume of the first fluid, the pressure of the first fluid, and one or more correction factors based on capacitance characteristics of the at least one fluid reservoir and one or more tubing system components, fluid properties of the first fluid, and a component slack of the one or more fluid injector mechanical components associated with the fluid injector system; calculating a first volume compliance factor of the first fluid in the at least one fluid reservoir based on the first programmed volume of the first fluid and the calculated first system volume compliance; and compensating for the first volume compliance factor to deliver the first programmed volume by one of: over-driving a distance that a first drive member travels in the at least one fluid reservoir, under-driving the distance that the first drive member travels in the at least one fluid reservoir, increasing a delivery time of the first fluid in the at least one fluid reservoir, and decreasing the delivery time of the first fluid in the at least one fluid reservoir.

22 . The method of claim 1 , wherein the at least one fluid reservoir comprises at least one first fluid reservoir containing the first fluid and at least one second fluid reservoir containing a second fluid, wherein the method further comprises:
determining a fluid volume of the second fluid in the at least one second fluid reservoir of the fluid injector system; determining a second pressure at which a second programmed volume of the second fluid is to be injected; calculating a second system volume compliance of the at least one second fluid reservoir, the one or more fluid injector mechanical components associated with the fluid injector system, and the one or more tubing system components based on: the volume of the second fluid, the pressure of the second fluid, and one or more correction factors based on capacitance characteristics of the at least one second reservoir and one or more tubing system components, fluid properties of the second fluid, and the component slack of the one or more fluid injector mechanical components associated with the fluid injector system; calculating a second volume compliance factor of the second fluid in the at least one second fluid reservoir based on the second programmed volume of the second fluid and the calculated second system volume compliance; and compensating for the second volume compliance factor to deliver the second programmed volume by one of: over-driving a distance that a second drive member travels in the at least one second fluid reservoir, under-driving the distance that the second drive member travels in the at least one second fluid reservoir, increasing a delivery time of the second fluid in the at least one second fluid reservoir, and decreasing the delivery time of the second fluid in the at least one second fluid reservoir.

23 . The method of claim 21 , further comprising the step of determining whether the at least one fluid reservoir contains at least a volume of the first fluid corresponding to the programmed volume plus an amount of the first fluid equal to the calculated system volume compliance of the at least one fluid reservoir.

24 . The method of claim 22 , wherein the at least one first fluid reservoir and the at least one second fluid reservoir are independently selected from a group consisting of a syringe, a rolling diaphragm syringe, a peristaltic pump, and a compressible bag.

25 . The method of claim 22 , wherein at least one of the at least one first fluid reservoir and the at least one second fluid reservoir is a syringe.

26 . The method of claim 25 , wherein the syringe comprises a plunger operatively connected to a piston selected from a linear actuated piston and a motor driven piston.

27 . The method of claim 22 , wherein at least one of the at least one first fluid reservoir and the at least one second fluid reservoir is a rolling diaphragm syringe.

28 . The method of claim 27 , wherein a proximal end of the rolling diaphragm syringe is operatively connected to a piston selected from a linear actuated piston and a motor driven piston.

29 . The method of claim 21 , wherein the first system volume compliance is calculated according to Equation (1):
C 1 =A 1 ·V 1 +B 1 ·P 1 +O 1   (1)
where C 1 is the first system volume compliance of the at least one fluid reservoir, A 1 is a position scalar of the at least one fluid reservoir, V 1 is available volume of the at least one fluid reservoir, B 1 is a pressure constant of the at least one fluid reservoir, P 1 is a pressure of fluid within the at least one fluid reservoir, and O 1 is the compensation factor of the at least one fluid reservoir.

30 . The method of claim 22 , wherein the second system volume compliance is calculated according to Equation (2):
C 2 =A 2 ·V 2 +B 2 ·P 2 +O 2   (2)
where C 2 is the second system volume compliance of the at least one second fluid reservoir, A 2 is a position scalar of the at least one second fluid reservoir, V 2 is available volume of the at least one second fluid reservoir, B 2 is a pressure constant of the at least one second fluid reservoir, P 2 is a pressure of fluid within the at least one second fluid reservoir, and O 2 is the compensation factor of the at least one second fluid reservoir.

31 . The method of claim 28 , wherein the first volume compliance factor is calculated according to Equation (3):
VC 1 =PV 1 +C 1   (3)
where VC 1 is the first volume compliance factor of the first fluid in the at least one fluid reservoir, PV 1 is the programmed volume of the first fluid, and C 1 is the first system volume compliance of the at least one fluid reservoir; and wherein the second volume compliance factor is calculated according to Equation (4):
VC 2 =PV 2 +C 2   (4)

where VC 2 is the second volume compliance factor of the second fluid in the at least one second fluid reservoir, PV 2 is the programmed volume of the second fluid, and C 2 is the second system volume compliance of the at least one second fluid reservoir.

32 . The method of claim 21 , wherein compensating for the first volume compliance factor the at least one fluid reservoir comprises:
over-driving the distance that the first drive member travels in the at least one fluid reservoir; and injecting an additional volume of the first fluid equal to the calculated first volume compliance factor.

33 . The method of claim 32 , further comprising closing a valve to fluidly isolate the at least one fluid reservoir from the patient after injecting the additional volume of the first fluid.

34 . The method of claim 21 , wherein compensating for the second volume compliance factor the at least one second fluid reservoir comprises:
over-driving the distance that the second drive member travels in the at least one second fluid reservoir; and injecting an additional volume of the second fluid equal to the calculated second volume compliance factor.

Assignees

• Bayer Healthcare Llc

Inventors

• Mcdermott Michael
• Spohn Michael
• Barone William
• Marsh Chelsea

Classifications

• A61M2205/3389

  Continuous level detection (A61M2205/3393 takes precedence) · CPC title

• A61M2205/3331

  Pressure; Flow · CPC title

• A61M2005/14553

  comprising a pressure jacket · CPC title

• A61M2005/14208

  with a programmable infusion control system, characterised by the infusion program · CPC title

• A61M5/16881

  Regulating valves (on-off valves, e.g. clamps A61M39/28) · CPC title