MEDICAL INFUSION PUMP WITH POWER SOURCE VOLTAGE LOGGING AND METHOD FOR LOGGING A POWER SOURCE VOLTAGE IN A MEDICAL INFUSION PUMP

• US 20140194848A1
• Filed: 02/06/2014
• Published: 07/10/2014
• Est. Priority Date: 09/10/2009
• Status: Active Grant

• Current Assignee: Roche Diabetes Care Inc. (Roche Holding AG)
• Original Assignee: Roche Diagnostics International AG (Roche Holding AG)
• Inventors: Aeschlimann, Reto, Rufer, Thomas
• Granted Patent: US 9,316,700 B2
• Time in Patent Office: Days
• US Class Current: 604/500
• CPC Class Codes: A61M 2205/18 with alarm
• CPC Class Codes: A61M 2205/8206 battery-operated
• CPC Class Codes: A61M 5/14244 adapted to be carried by the patient, e.g. portable on the body
• CPC Class Codes: G01R 31/3644 Constructional arrangements
• CPC Class Codes: G01R 31/396 Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
• CPC Class Codes: G01R 31/40 Testing power supplies testing photovoltaic devices H02S50/10
• CPC Class Codes: G08B 21/182 Level alarms, e.g. alarms responsive to variables exceeding a threshold
• CPC Class Codes: H02J 9/061 for DC powered loads
• CPC Class Codes: Y10T 29/4973 Replacing of defective part

Abstract

A medical infusion pump and a method for logging a power source voltage of a medical infusion pump are disclosed. The medical pump may include a power source, a processor, and a voltage supervisor which responds if a voltage (VDD) drops to a response voltage level which is above a reset voltage level of the processor. When the voltage supervisor responds, the processor start logging the voltage (Vbat) of the power source in a memory, thus generating a voltage log. The memory maintains the logged data when the power supply by the power source is interrupted, thus enabling retrospective analysis of the voltage log.

Claims

1. A method for retrospectively determining a cause of a power supply interruption in a portable device, comprising:

monitoring a processor supply voltage (VDD) via a voltage supervisor;

responding if the processor supply voltage (VDD) drops to a predetermined response voltage level which is above a reset voltage level of the processor by providing an output signal via the voltage supervisor and logging a power source voltage (Vbat) in a memory to generate a voltage log, and maintaining in the memory logged data when the power supply by the power source is interrupted to enable retrospective analysis of the voltage log; and

determining retrospectively the cause of the power supply interruption in the portable device by retrospectively analyzing the voltage log.

2. The method of claim 1 further comprising logging a time stamp via the processor when the voltage supervisor responds.

3. The method of claim 1 further comprising running a clock circuit of the portable device when the power supply is interrupted by a separate power supply or a power supply buffer.

4. The method of claim 1 further comprising:

logging, via the processor, a time stamp together with the power source voltage and an event marker, the event marker being indicative for the power supply interruption; and

distinguishing a dropping of the portable device from removal of the power source based on the time span of the power supply interruption;

indicating removal of the power source when the time span for the power supply interruption is greater than a predetermined time span, and otherwise reflecting the dropping of the portable device.

5. The method of claim 1 further comprising storing a number of logs in the memory of the portable device.

6. The method of claim 5 further comprising storing 2, 5, 10, or 100 logs in the memory of the portable device.

7. The method of claim 1 further comprising:

powering up the portable device,

running through, via the processor, a self-testing and powering-up routine, the program code of the powering-up routine being part of the general firmware that controls operation of the processor;

storing a corresponding power-up entry in the memory of the portable device together with a timestamp after completing the powering-up routine;

viewing a battery as having been removed if the time between the beginning of the logging, or the last logged value before voltage VDD has dropped to the reset voltage level is longer than the time required for running through the powering-up routine; and

reflecting otherwise that the battery was disconnected because of a dropping of the portable device.

8. The method of claim 7 further comprising delivering insulin to a patient via the portable device, wherein the portable device is an infusion pump.

9. The method of claim 7 further comprising viewing the battery as having been removed when the time between the beginning of the logging, or the last logged value before voltage VDD has dropped to the reset voltage level and the power-up entry is a half-a-second or more.

10. The method of claim 1 further comprising:

testing a battery of the portable device during operation of the portable device; and

alerting with a tactile alert of the portable device if the battery approaches an end of its lifetime.

11. The method of claim 10 wherein the alerting further comprises alerting at multiple levels of the Vbat for which the VDD is above the response voltage level.

12. The method of claim 1 further comprising:

selecting between either a stop mode or a maintenance mode of the portable device; and

operating the portable device in either the stop mode or the maintenance mode.

13. The method of claim 1 further comprising:

replacing the battery of the portable device during operation of the portable device; and

bridging the power supply interruption by an internal buffer of the portable device.

15. The method of claim 1 further comprising:

logging, via the processor, a time stamp together with the power source voltage and an event marker, the event marker being indicative for the preceding power supply interruption; and

distinguishing a dropping of the handheld device from removal of the power source based on the time span of the power supply interruption;

indicating removal of the power source when the time span for the power supply interruption is greater than a predetermined time span, and otherwise reflecting the dropping of the handheld device.

14. A method for retrospectively determining a cause of a power supply interruption in a handheld device, comprising:

monitoring a processor supply voltage (VDD) via a voltage supervisor;

responding if the processor supply voltage (VDD) drops to a predetermined response voltage level which is above a reset voltage level of the processor by providing an output signal via the voltage supervisor and logging a power source voltage (Vbat) in a memory to generate a voltage log, and maintaining in the memory logged data when the power supply by the power source is interrupted to enable retrospective analysis of the voltage log; and

determining retrospectively the cause of the power supply interruption in the handheld device by retrospectively analyzing the voltage log.

16. The method of claim 14 further comprising running a clock circuit of the handheld device when the power supply is interrupted by a separate power supply or a power supply buffer.

17. The method of claim 14 further comprising storing a number of logs in the memory of the handheld device.

18. The method of claim 17 further comprising storing 2, 5, 10, or 100 logs in the memory of the handheld device.

19. The method of claim 14 further comprising:

powering up the handheld device,

running through, via the processor, a self-testing and powering-up routine, the program code of the powering-up routine being part of the general firmware that controls operation of the processor;

storing a corresponding power-up entry in the memory of the handheld device together with a timestamp after completing the powering-up routine;

viewing a battery as having been removed if the time between the beginning of the logging, or the last logged value before voltage VDD has dropped to the reset voltage level is longer than the time required for running through the powering-up routine; and

reflecting otherwise that the battery was disconnected because of a dropping of the handheld device.

20. The method of claim 19 further comprising delivering insulin to a patient via the handheld device, wherein the handheld device is an infusion pump.