System for air volume correction based on fluid pressure and flow rate

Abstract

A method for determining the volume of one or more air bubbles in a fluid pathway includes the steps of initiating an injection procedure in which at least one medical fluid is injected into the fluid pathway, receiving an electrical signal from an air detector of the fluid injector system, the electrical signal indicating the presence of one or more air bubbles in the fluid pathway, calculating a flow rate of the fluid in the fluid pathway, determining a fluid pressure in the fluid pathway, determining one or more bubble count values ​​representing the volume of the one or more air bubbles, and updating a cumulative counter with the one or more bubble count values, the cumulative counter representing the cumulative volume of air that has passed through the fluid pathway during the injection procedure.

Claims

1. At least one syringe configured to inject at least one medical fluid, A fluid path that communicates with at least one syringe, An air detector configured to detect one or more bubbles in the fluid path, At least one processor, An injection procedure is initiated in which at least one medical fluid is injected into the fluid pathway from at least one syringe. An electrical signal is received from the air detector, and the electrical signal indicates that one or more bubbles are present in the fluid path. The flow rate of the medical fluid in the fluid path is calculated, Determine the fluid pressure in the fluid path, The count value of the one or more bubbles is determined based on the duration for which the electrical signal is received, the flow rate, and the fluid pressure, and the count value represents the volume of the one or more bubbles. The cumulative counter is updated with the count value of one or more bubbles, and the cumulative counter represents the cumulative volume of air that passed through the fluid path during the injection procedure. At least one processor programmed or configured in such a way Equipped with, Calculating the flow rate of the fluid in the fluid path is, The commanded flow rate, time lag, and for the injection procedure. Compliance of one or more components of a fluid injector system The step includes estimating the actual flow rate in the fluid path based on the above, The time lag is compensated by applying a correction algorithm that takes into account the system capacitance and injection parameters, the correction algorithm comprising at least one equation including a time constant for estimating the actual flow rate, the time constant being derived based on system characteristics and injection conditions, in a fluid injector system.

2. The fluid injector system according to claim 1, wherein the at least one processor is further programmed or configured to stop the injection procedure in response to the cumulative counter exceeding a predetermined threshold.

3. The fluid injector system according to claim 1 or 2, wherein the at least one processor is further programmed or configured to continue the injection procedure in response to the cumulative counter falling below a predetermined threshold.

4. The fluid injector system according to claim 2 or 3, wherein the predetermined threshold is programmed into the memory of the fluid injector system.

5. The fluid injector system according to any one of claims 1 to 4, wherein the at least one processor is further programmed or configured to set the cumulative counter to zero before initiating the injection procedure.

6. The fluid injector system according to any one of claims 1 to 5, wherein the at least one processor is further programmed or configured to purge one or more bubbles from the fluid injector system before initiating the injection procedure.

7. A computer program product for determining the volume of one or more bubbles in the fluid path of a fluid injector system, wherein when executed by at least one processor of the fluid injector system, the at least one processor is configured to An injection procedure is initiated in which at least one medical fluid is injected into the fluid pathway. An electrical signal is received from the air detector of the fluid injector system, and the electrical signal indicates that one or more bubbles are present in the fluid path. The flow rate of the medical fluid in the fluid path is calculated. Determine the fluid pressure in the fluid path, The count value of the one or more bubbles is determined based on the duration for which the electrical signal is received, the flow rate, and the fluid pressure, and the count value represents the volume of the one or more bubbles. The cumulative counter is updated with the count value of one or more bubbles, and the cumulative counter represents the cumulative volume of air that passed through the fluid path during the injection procedure. Includes a non-temporary computer-readable medium containing one or more instructions, Calculating the flow rate of the fluid in the fluid path is, The commanded flow rate, time lag, and for the injection procedure. Compliance of one or more components of the fluid injector system The step includes estimating the actual flow rate in the fluid path based on the above, The time lag is compensated by applying a correction algorithm that takes into account system capacitance and injection parameters, the correction algorithm comprising at least one equation including a time constant for estimating the actual flow rate, the time constant being derived based on system characteristics and injection conditions, in a computer program product.

8. The computer program product according to claim 7, further comprising one or more instructions causing at least one processor to stop the injection procedure in response to the cumulative counter exceeding a predetermined threshold.

9. The computer program product according to claim 7 or 8, wherein the one or more instructions further cause the at least one processor to continue the injection procedure in response to the cumulative counter falling below a predetermined threshold.

10. The computer program product according to claim 8 or 9, wherein the predetermined threshold is programmed into the memory of the fluid injector system.

11. The computer program product according to any one of claims 7 to 10, wherein the one or more instructions further cause the at least one processor to set the cumulative counter to zero before initiating the injection procedure.

12. The computer program product according to any one of claims 7 to 11, wherein the one or more instructions further cause the at least one processor to purge one or more bubbles from the fluid injector system before initiating the injection procedure.

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