US 12,226,198 B2
Systems and methods for measuring capillary refill time
Steven D. Baker, Beaverton, OR (US)
Assigned to PROMEDIX, INC., Portland, OR (US)
Filed by ProMedix, Inc., Portland, OR (US)
Filed on Jul. 21, 2023, as Appl. No. 18/356,921.
Application 18/356,921 is a continuation of application No. 18/182,971, filed on Mar. 13, 2023.
Claims priority of provisional application 63/269,245, filed on Mar. 11, 2022.
Prior Publication US 2023/0355122 A1, Nov. 9, 2023
Int. Cl. A61B 5/026 (2006.01); A61B 5/00 (2006.01)
CPC A61B 5/0261 (2013.01) [A61B 5/0053 (2013.01); A61B 5/6826 (2013.01); A61B 5/6843 (2013.01); A61B 5/7203 (2013.01); A61B 5/725 (2013.01); A61B 5/7264 (2013.01); A61B 5/746 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system for providing closed-loop feedback of patient fluid state for infusion pump control, comprising:
an infusion pump having an infusion parameter, the infusion pump configured to deliver a fluid to a patient having a patient fluid state;
an objective capillary refill time (CRT) measurement component having:
an optical sensor comprising:
an optical source, and
an optical detector configured to generate an electrical signal representative of optical energy received by the optical detector, wherein the optical sensor is configured to generate optical sensor data that includes the electrical signal representative of the optical energy; and
a processor programmed to:
receive the optical sensor data from the optical sensor,
detect an application of and a release of a blanching pressure on patient tissue, the detected application of and release of the blanching pressure based on one or more characteristics of the optical sensor data,
determine a specific and objective CRT measurement based on the optical sensor data and the detected release of the blanching pressure,
adjust the infusion parameter of the infusion pump based on the specific and objective CRT measurement, the adjustment of the operating parameter correlating to an adjustment to the patient fluid state.