Capacitive measurement device with integrated electrical and mechanical shielding

• US 10,448,875 B2
• Filed: 10/15/2015
• Issued: 10/22/2019
• Est. Priority Date: 10/15/2015
• Status: Active Grant

• Current Assignee: University of Utah Research Foundation (State of Utah), Stream DX, Inc
• Original Assignee: Stream DX, Inc
• Inventors: Holt, Brian D., McClellan, Scott B., Le, Alvin Y., Ogden, Kent James
• Primary Examiner(s): Fernandes, Patrick
• Application Number:
  US14/884,591
• Publication Number:
  US 20170105670A1
• Time in Patent Office: 1,468 Days
• CPC Class Codes: A61B 2560/0223 of calibration, e.g. protocols for calibrating sensors
• CPC Class Codes: A61B 2560/0252 using ambient temperature
• CPC Class Codes: A61B 2562/227 Sensors with electrical connectors
• CPC Class Codes: A61B 5/0002 Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network A61B5/07 takes precedence; transmission systems for measured values G08C; transmission H04B; transmission of digital information H04L; wireless communication networks H04W
• CPC Class Codes: A61B 5/208 adapted to determine urine quantity, e.g. flow, volume
• CPC Class Codes: G01F 1/007 by measuring the level variations of storage tanks relative to the time
• CPC Class Codes: G01F 1/56 by using electric or magnetic effects G01F1/66 takes precedence
• CPC Class Codes: G01F 22/00 Methods or apparatus for measuring volume of fluids or fluent solid material, not otherwise provided for
• CPC Class Codes: G01F 23/263 by measuring variations in capacitance of capacitors
• CPC Class Codes: G01F 23/268 mounting arrangements of probes

Abstract

A substance measurement device includes: a container portion configured to receive a substance; a sensing device configured to measure a property of the substance related to at least one of a flow rate of the substance into the container portion, a level of the substance within the container portion, and a volume of the substance within the container portion; and at least one shield positioned within the container portion and configured to provide at least one of: a mechanical buffer between the substance entering the container portion and the sensing device; and an electrical shield between the substance entering the container portion and the sensing device.

Claims

1. A substance measurement device, comprising:

a container portion having a sensing portion and a non-sensing portion, the non-sensing portion of the container portion configured to receive a substance from outside of the container portion;

at least one sensor positioned within the sensing portion of the container portion, the at least one sensor configured for a measurement of a property of the substance within the sensing portion of the container portion, the property related to at least one of a flow rate of the substance into the container portion, a level of the substance within the container portion, or a volume of the substance within the container portion; and

at least one shield positioned within the container portion between the sensing portion and the non-sensing portion, the sensing portion of the container portion configured to receive the substance from the non-sensing portion of the container portion through a plurality of paths, each of the plurality of paths including a gap, channel, void, or aperture below, around, or through the at least one shield, the at least one shield configured to provide at least one of;

buffering between the substance entering the non-sensing portion of the container portion and the at least one sensor positioned within the sensing portion of the container portion by controlling flow of the substance from the non-sensing portion of the container portion to the sensing portion of the container portion;

or

shielding between the substance entering the non-sensing portion of the container portion and the at least one sensor positioned within the sensing portion of the container portion to block the at least one sensor from sensing outside of the sensing portion of the container portion.

2. The substance measurement device of claim 1, wherein the substance is a liquid.

3. The substance measurement device of claim 1, wherein the substance is urine.

4. The substance measurement device of claim 1, wherein the at least one sensor includes a capacitive sensor.

5. The substance measurement device of claim 4, further comprising:

a controller communicatively coupled to the at least one sensor and configured to perform at least one of;

capture raw data indicative of capacitance from the capacitive sensor and store it in at least one of a memory and a storage device;

or

calculate at least one of the flow rate of the substance into the container portion, the level of the substance within the container portion, and the volume of the substance within the container portion based on raw data from the capacitive sensor over time.

6. The substance measurement device of claim 5, further comprising:

an electronics portion removably coupled with the container portion, wherein the electronics portion includes the controller.

7. The substance measurement device of claim 6, wherein the electronics portion further includes:

a communication module communicatively coupled to the controller.

8. The substance measurement device of claim 1, further comprising:

an exterior shield positioned on the outside of the container portion and configured to isolate the at least one sensor from external disturbances caused by effects of an external environment outside of the container portion.

9. The substance measurement device of claim 1, wherein the container portion includes at least one tapered side-wall that tapers from a smaller size at a lower portion of the container portion to a larger size at an upper portion of the container portion above the lower portion of the container portion.

10. The substance measurement device of claim 1, further comprising:

an electronics portion removably coupled with the container portion;

wherein the container portion does not include a bottom wall;

wherein a top surface of the electronics portion serves as a bottom for the container portion when the electronics portion is coupled with the container portion.

11. The substance measurement device of claim 10, wherein the top surface of the electronics portion includes additional sensors that come into contact with the substance when it enters the container portion.

12. The substance measurement device of claim 1, wherein the container portion includes at least one side-wall and a bottom wall.

13. The substance measurement device of claim 1, further comprising:

an electronics portion removably coupled with the container portion using complimentary coupling elements.

14. The substance measurement device of claim 13, wherein the complimentary coupling elements include at least one of threads, bayonet mounts, tabs, clips, or fasteners.

15. The substance measurement device of claim 1, wherein the at least one shield is configured to provide:

buffering between the substance entering the non-sensing portion of the container portion and the at least one sensor positioned within the sensing portion of the container portion by controlling flow of the substance from the non-sensing portion of the container portion to the sensing portion of the container portion.

16. The substance measurement device of claim 1, wherein controlling flow of the substance from the non-sensing portion of the container portion to the sensing portion of the container portion includes reducing disturbances, turbulence, or slosh of the substance entering the non-sensing portion of the container portion from being transferred to the sensing portion of the container portion, wherein the disturbances, turbulence, or slosh affect measurement of the property by the at least one sensor positioned within the sensing portion of the container portion, wherein the at least one shield and the plurality of paths act as a mechanical low-pass filter for the measurement of the property by the at least one sensor positioned within the sensing portion of the container portion.

17. A liquid measurement device, comprising:

a container portion having a sensing portion and a non-sensing portion, the non-sensing portion of the container portion configured to receive liquid from outside of the container portion;

a capacitive sensor positioned within the sensing portion of the container portion, the capacitive sensor configured for a measurement of changes in capacitance within the sensing portion of the container portion due to changes in the level of the liquid within the container portion; and

a controller communicatively coupled to the capacitive sensor;

at least one shield positioned within the container portion between the sensing portion and the non-sensing portion, the sensing portion of the container portion configured to receive the liquid from the non-sensing portion of the container portion through a plurality of paths, each of the plurality of paths including a gap, channel, void, or aperture below, around, or through the at least one shield, the at least one shield configured to provide at least one of;

buffering between the liquid entering the non-sensing portion of the container portion and the capacitive sensor positioned within the sensing portion of the container portion by controlling flow of the liquid from the non-sensing portion of the container portion to the sensing portion of the container portion;

or

shielding between the liquid entering the non-sensing portion of the container portion and the capacitive sensor positioned within the sensing portion of the container portion by blocking the capacitive sensor from sensing outside of the sensing portion of the container portion; and

wherein the controller is configured to perform at least one of;

capture raw data indicative of capacitance from the capacitive sensor and store it in at least one of a memory and a storage device;

or

calculate at least one of the flow rate of the liquid into the container portion, the level of the liquid within the container portion, and the volume of the liquid within the container portion based on raw data from the capacitive sensor over time.

18. The liquid measurement device of claim 17, further comprising:

an electronics portion removably coupled with the container portion, wherein the electronics portion includes the controller and a communication module communicatively coupled to the controller.

19. The liquid measurement device of claim 17, further comprising:

an electronics portion removably coupled with the container portion;

wherein the container portion does not include a bottom wall;

wherein a top surface of the electronics portion serves as a bottom for the container portion when the electronics portion is coupled with the container portion.

20. The liquid measurement device of claim 17, wherein the at least one shield is configured to provide:

buffering between the liquid entering the non-sensing portion of the container portion and the capacitive sensor positioned within the sensing portion of the container portion by controlling flow of the liquid from the non-sensing portion of the container portion to the sensing portion of the container portion.

21. The liquid measurement device of claim 17, wherein the liquid is urine.

22. The liquid measurement device of claim 17, wherein controlling flow of the liquid from the non-sensing portion of the container portion to the sensing portion of the container portion includes reducing disturbances, turbulence, or slosh of the liquid entering the non-sensing portion of the container portion from being transferred to the sensing portion of the container portion, wherein the disturbances, turbulence, or slosh affect the measurement of the changes in capacitance by the capacitive sensor positioned within the sensing portion of the container portion, wherein the at least one shield and the plurality of paths act as a mechanical low-pass filter for the measurement of the changes in capacitance by the capacitive sensor positioned within the sensing portion of the container portion.

24. The urine measurement device of claim 21, further comprising:

an electronics portion removably coupled with the container portion using complimentary coupling elements, wherein the electronics portion includes the controller and a communication module communicatively coupled to the controller;

wherein the container portion does not include a bottom wall;

wherein a top surface of the electronics portion serves as a bottom for the container portion when the electronics portion is coupled with the container portion.

23. A urine measurement device, comprising:

a container portion having a sensing portion and a non-sensing portion, the non- sensing portion of the container portion configured to receive urine from outside of the container portion;

a capacitive sensor positioned within the sensing portion of the container portion, the capacitive sensor configured for a measurement of changes capacitance within the sensing portion of the container portion due to changes in the level of the urine within the container portion;

at least one shield positioned within the container portion, the sensing portion of the container portion configured to receive the urine from the non-sensing portion of the container portion through a plurality of paths, each of the plurality of paths including a gap, channel, void, or aperture below, around, or through the at least one shield, the at least one shield configured to provide buffering between the urine entering the non-sensing portion of the container portion and the capacitive sensor positioned within the sensing portion of the container portion by controlling flow of the urine from the non-sensing portion of the container portion to the sensing portion of the container portion; and

at least one exterior shield positioned on the outside of the container portion and configured to isolate the capacitive sensor from external disturbances caused by effects of an external environment outside of the container portion.

25. The urine measurement device of claim 23, further comprising:

a controller communicatively coupled to the capacitive sensor, wherein the controller is configured to perform at least one of;

capture raw data indicative of capacitance from the capacitive sensor and store it in at least one of a memory and a storage device;

or

calculate at least one of the flow rate of the urine into the container portion, the level of the urine within the container portion, and the volume of the urine within the container portion based on raw data from the capacitive sensor over time.

26. The urine measurement device of claim 23, wherein controlling flow of the urine from the non-sensing portion of the container portion to the sensing portion of the container portion includes reducing disturbances, turbulence, or slosh of the urine entering the non-sensing portion of the container portion from being transferred to the sensing portion of the container portion, wherein the disturbances, turbulence, or slosh affect the measurement of the changes in capacitance by the capacitive sensor positioned within the sensing portion of the container portion, wherein the at least one shield and the plurality of paths act as a mechanical low-pass filter for the measurement of the changes in capacitance by the capacitive sensor positioned within the sensing portion of the container portion.