Patient hydration system with redundant monitoring
A patient hydration system including an infusion device for administering hydration fluid to a patient, and a hydration fluid measurement device responsive to a source of hydration fluid, a patient urine output measurement device. A controller is responsive to the hydration fluid measurement device and the patient urine output measurement device. The controller operates the infusion device, in response to the patient urine output measurement device and the hydration fluid measurement device, to hydrate the patient based on the patient' s urine output. The controller also monitors the operation history of the infusion device thereby providing redundancy in the measurement of the amount of hydration fluid administered to the patient.
1 . A patient hydration system comprising:
an infusion subsystem which infuses an infusion fluid into a patient and including at least two means for determining the amount of infusion fluid infused;
a urine output measurement subsystem which measures urine output by the patient;
a console including an input for setting a desired fluid balance; and
a controller associated with the console and responsive to the urine output measurement subsystem and including a balancing function which controls the infusion subsystem to administer infusion fluid into the patient based on an input desired fluid balance and an amount of urine output by the patient;
the controller further responsive to said two means for determining and configured to calculate the amount of infusion fluid infused into the patient based on a determined amount of infusion fluid infused.
2 . The system of claim 1 in which the infusion subsystem includes a pump controlled by the controller.
3 . The patient hydration system of claim 2 in which the pump infuses fluid into the patient from a source of infusion fluid.
4 . The patient hydration system of claim 3 in which the infusion subsystem further includes a weighing mechanism for the source of infusion fluid and the controller is responsive to said weighing mechanism for calculating the amount of infusion fluid infused into the patient.
5 . The patient hydration system of claim 4 in which the controller is further configured to monitor the operation of the pump and to calculate the amount of infusion fluid infused into the patient based on the monitored operation of the pump.
6 . The patient hydration system of claim 5 in which the controller is further configured to output a signal if the determined amount of infusion fluid infused into the patient based on the weight of the source of infusion fluid differs from the calculated amount of fluid infused into the patient based on the monitored operation of the pump by a predetermined amount.
7 . The system of claim 1 in which the console further includes an input for setting a desired therapy time and the controller is configured to control the infusion subsystem to administer infusion fluid infused into the patient to balance the urine output with the infusion fluid infused based on an input desired fluid balance and an input desired therapy time.
8 . The system of claim 1 in which the controller is programmed to determine and display on the console the amount of infusion fluid infused into the patient and an amount of urine output by the patient.
9 . The system of claim 8 in which the controller is programmed to determine the amount of infusion fluid infused and the amount of urine output by weight.
10 . The system of claim 1 in which the controller is programmed to calculate the amount of infusion fluid infused over a time interval and to calculate the amount of urine output over a time interval.
11 . The system of claim 1 in which the controller is further configured to display on the console a net fluid gain or loss.
12 . The system of claim 1 in which the urine output measurement subsystem includes a urine collection chamber connected to the patient.
13 . The system of claim 12 in which the urine output measurement subsystem further includes a weighing mechanism for weighing the urine collection chamber.
14 . The system of claim 1 in which the controller is configured, based on an input set desired fluid balance, to administer infusion fluid at a rate equal to, less than, or greater than the rate of urine output by the patient.
15 . The system of claim 1 in which the controller is configured to determine a rate of change of urine output, calculate a desired infusion rate based on the determined rate of change of urine output and the desired fluid balance, and to adjust the operation of the infusion subsystem based on the calculated desired infusion rate.
16 . The system of claim 1 further including a priming adapter configured to connect the infusion subsystem to the urine output measurement subsystem.
17 . The system of claim 16 in which the console includes a priming input and the controller is configured, in response to the priming input, to control the infusion subsystem to drive infusion fluid through the priming adapter into the urine output measurement subsystem.
18 . The system of claim 19 in which the controller is further configured to test the operation of the infusion subsystem and the urine output measurement subsystem in response to the priming input.
19 . The system of claim 1 in which the infusion subsystem further includes a pressure sensor configured to detect occlusions in the infusion subsystem.
20 . The system of claim 19 in which the controller is responsive to the pressure sensor and configured to interrupt the balancing function in response to a detected pressure greater than a predetermined pressure.
21 . The system of claim 20 in which the controller is further configured to resume the balancing function if the detected pressure reduces to a pressure below the predetermined pressure.
22 . The system of claim 1 in which the console further includes a bolus input for setting a desired bolus amount of infusion fluid and the controller is further configured to control the infusion subsystem to administer the desired bolus amount of infusion fluid in addition to the desired fluid balance.
23 . The system of claim 1 in which the controller further including a taper down function, the taper down function, in response to a taper down input, automatically controlling the infusion subsystem to automatically administer increasingly lesser amount of infusion fluid into the patient.
24 . The system of claim 1 in which the controller is further configured to determine one or more abnormal readings output by the infusion subsystem and/or the urine output measurement subsystem including readings indicating a lesser amount of urine than a previous reading, a greater amount of infusion fluid than a previous reading, and/or a sharply varying urine output reading or infusion fluid infused reading and, in response to a detected abnormal reading, control the infusion subsystem according to a predetermined function.
25 . The system of claim 24 in which a predetermined function controls the infusion subsystem to infuse infusion fluid at a preset minimum infusion rate until the detected abnormal reading is no longer present and/or which controls the infusion subsystem to infuse infusion fluid at a rate established prior to detection of the abnormal reading.