SYSTEMS AND METHODS FOR MEASURING A QUANTITY OF BREAST MILK CONSUMED BY A BABY

Abstract

The system includes at least one infrared light intensity sensor positioned on substrate to measure infrared light incident from a baby's stomach during a feeding. The infrared light is provided by an infrared light source. An initial intensity of infrared light incident from the human stomach is measured at the beginning of the feeding. A feeding intensity of infrared light incident from the human stomach is measured at the end of the feeding. The ratio of these infrared intensity measurements are used to calculate a value for the volume ingested into the human stomach during the feeding. The infrared light intensity measurements can be taken continuously to provide a real-time report of how the feeding is progressing, such as to a parent or doctor. The light source and sensor can be incorporated into an article of clothing to provide non-invasive measurements that do not physically obstruct the feeding.

Claims

1. A system for quantifying a volume ingested by a human during a feeding comprising: at least one infrared light source positioned and configured to provide infrared light to the contents of a human stomach; at least one infrared light intensity sensor positioned and configured to detect intensities of infrared light incident from the human stomach; and a non-transitory computer storage medium in communication with said at least one infrared light intensity sensor and encoded with one or more computer programs for outputting a volume ingested by a human, the one or more computer programs including: a light intensity calculation module configured to identify an initial intensity of infrared light incident from the human stomach at a first instance, at least one feeding intensity of infrared light incident from the human stomach at a second instance, and the ratio of the at least one feeding intensity to the initial intensity; and a volume calculation module configured to output a value for the volume ingested into the human stomach between the first instance and the second instance, wherein the volume ingested is defined by a formula that correlates the ratio of the at least one feeding intensity to the initial intensity to the volume ingested.

2. The system according to claim 1, wherein the first instance is prior to a start of the feeding and the second instance is during the feeding.

3. The system according to claim 1, wherein the second instance is after the feeding is completed.

4. The system according to claim 1, further comprising a barrier positioned to limit detection of infrared light directly from the at least one infrared light source by the at least one infrared intensity sensor.

5. The system according to claim 4, wherein the barrier includes a reflective layer.

6. The system according to claim 1, wherein the at least one infrared light source is one or more infrared LEDs.

7. The system according to claim 1, wherein the at least one infrared light source is positioned adjacent to the at least one infrared light intensity sensor such that each interface with the skin proximate the human stomach.

8. The system according to claim 1, wherein the infrared light is emitted at a wavelength of about 1200 nm-1500 nm.

9. The system according to claim 1, wherein the volume ingested is defined by the following formula:
V=(log(I/I.sub.o)+0.0036)/0.0007 wherein I.sub.o is the initial intensity of infrared light incident from the human stomach and I is the at least one feeding intensity of infrared light incident from the human stomach.

10. The system according to claim 1, further comprising one or more additional sensors including a heart rate sensor, a respiratory sensor, a temperature sensor, or a combination thereof.

11. A method for quantifying a volume ingested by a human during a feeding comprising: providing at least one infrared light source and at least one infrared light intensity sensor; emitting infrared light from the at least one infrared light source to the contents of a human stomach; measuring an initial intensity of infrared light incident from the human stomach with the at least one infrared light intensity sensor at a first instance; measuring at least one feeding intensity of infrared light incident from the human stomach with the at least one infrared light intensity sensor at a second instance; and calculating a volume ingested into the human stomach between the first instance and the second instance that corresponds to the ratio of the at least one feeding intensity to the initial intensity.

12. The method according to claim 11, further comprising: positioning the at least one infrared light source to the skin proximate a human stomach; emitting infrared light from the at least one infrared light source to the contents of the human stomach; and positioning the at least one infrared light intensity sensor to detect intensities of infrared light provided by the at least one infrared light source and incident from the human stomach.

13. The method according to claim 11, wherein the infrared light is emitted at a wavelength of about 1200 nm-1500 nm.

14. The method according to claim 11, wherein the volume ingested is defined by to the following formula:
V=(log(I/I.sub.o)+0.0036)/0.0007 wherein I.sub.o is the initial intensity of infrared light incident from the human stomach and I is the at least one feeding intensity of infrared light incident from the human stomach.

15. The method according to claim 11, wherein calculating a volume ingested into the human stomach between the first instance and the second instance that corresponds to the ratio of the at least one feeding intensity to the initial intensity further comprises: continuously calculating the volume ingested into the human stomach during a feeding.

16. A system for quantifying a volume ingested by a human during a feeding comprising: at least one infrared light source positioned and configured to provide infrared light to the contents of a human stomach; at least one infrared light intensity sensor positioned adjacent to the at least one infrared light source and positioned to detect intensities of infrared light incident from the human stomach; and a non-transitory computer storage medium in communication with said at least one infrared light intensity sensor and encoded with one or more computer programs for outputting a volume ingested by a human, the one or more computer programs including: a light intensity calculation module configured to identify an initial intensity of infrared light incident from the human stomach at a first instance prior to or at the beginning of a feeding, a plurality of feeding intensities of infrared light incident from the human stomach at a plurality of additional instances during or after the feeding, and the ratio of the each feeding intensity to the initial intensity; a volume calculation module configured to continuously output a value for the volume ingested during the feeding, wherein the volume ingested is defined by a formula that correlates to the ratio of the latest feeding intensity of infrared light incident from the human stomach to the initial intensity to the volume ingested.

17. The system according to claim 16, wherein the volume calculation module outputs a volume ingested according to the following formula:
V=(log(I/I.sub.o)+0.0036)/0.0007 wherein I.sub.o is the initial intensity of infrared light incident from the human stomach, I is the feeding intensity of infrared light incident from the human stomach.

18. The system according to claim 16, further comprising: one or more databases including historical light intensity data from the light intensity calculation module and volume ingestion data from the volume calculation module; and a microcontroller system including a wireless data communication module configured to enable communication of calculated light intensities and calculated volumes to the one or more databases from the light intensity calculation module and the volume calculation module.

19. The system according to claim 16, wherein the infrared light is emitted at a wavelength of about 850 nm, 880 nm, 940 nm, 1050 nm, 1250 nm, 1550 nm, 1650 nm, or combinations thereof.

20. The system according to claim 19, wherein the infrared light is emitted at a wavelength of about 940 nm and about 1250 nm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The drawings show embodiments of the disclosed subject matter for the purpose of illustrating the invention. However, it should be understood that the present application is not limited to the precise arrangements and instrumentalities shown in the drawings, wherein:

[0011] FIG. 1A is a schematic drawing of a system for quantifying a volume ingested by a human during a feeding according to some embodiments of the present disclosure;

[0012] FIG. 1B is a schematic drawing of a system for quantifying a volume ingested by a human during a feeding according to some embodiments of the present disclosure;

[0013] FIG. 2 is a schematic drawing of a system for quantifying a volume ingested by a human during a feeding according to some embodiments of the present disclosure; and

[0014] FIG. 3 is a chart of a method of quantifying a volume ingested by a human during a feeding according to some embodiments of the present disclosure

DETAILED DESCRIPTION

[0015] It is recognized that certain limitations and features described in the present disclosure, such as light sources or light sensors, may need to be modified or removed in order to be in compliance with applicable local laws. By way of example, in the United States, certain limitations and features may need to be modified or removed in order to be in compliance with the Health Insurance Portability and Accountability Act (HIPAA).

[0016] Referring now to FIG. 1A, some aspects of the disclosed subject matter are directed to a system 100 for quantifying a volume ingested by a human during a feeding. While the present disclosure shows and describes an exemplary embodiment of system 100 wherein the human is a baby and the volume ingested is breast milk, system 100 is not limited in this regard. As used herein, the term “feeding” is used to refer to the ingestion of milk or milk-like liquids and solids, e.g., breast milk.

[0017] In some embodiments, system 100 includes at least one substrate 110. The substrate includes one or more surfaces configured to comfortably interface with human skin. In some embodiments, at least one of the surfaces interfaces substantially uninterruptedly with a surface of the human skin. In some embodiments, substrate 110 includes a disk, spheroid body, polyhedral body, bib, shirt, blouse, dress, frock, onesie, or a combination thereof. In some embodiments, the substrate and/or the one or more substrate surfaces are composed of a biocompatible material. In some embodiments, the substrate is about 1 inch to about 2 inches in diameter. In some embodiments, the contact patch of the at least one of the surface with the surface of the skin is about 1 inch to about 2 inches.

[0018] In some embodiments, one or more infrared light sources 120 is positioned on substrate 110 and emit an amount of infrared light. The infrared light source 120 is configured to provide infrared light to the skin proximate a human stomach so that at least a portion of the light permeates the stomach lining and interacts with the stomach contents. The infrared light sources 120 can be of any number, layout, and/or orientation so long as light is delivered through the skin to the stomach in the manner described above. In some embodiments, one or more infrared light sources are arranged in a grid, a line, a circle, etc.

[0019] When in use, in some embodiments, substrate 110 is applied to the surface of the skin proximate the stomach, such that the surface of the skin and one or more surfaces of substrate 110 upon which infrared light sources 120 are disposed are abutting. In some embodiments, the infrared light from infrared light source 120 is emitted substantially perpendicular to the surface of the skin. In some embodiments, the infrared light from infrared light source 120 is emitted at an angle to the surface of the skin. In some embodiments, the infrared light from infrared light source 120 is emitted substantially perpendicular to the surface of substrate 110 on which infrared light source 120 is disposed. In some embodiments, the infrared light from infrared light source 120 is oriented at an angle to the surface of substrate 110 on which infrared light source 120 is disposed. In some embodiments, infrared light source 120 is one or more infrared LEDs. In some embodiments, infrared light source 120 emits light at a wavelength of about 800 nm to about 2000 nm. In some embodiments, infrared light source 120 emits light at a wavelength of about 800 nm to about 1000 nm. In some embodiments, infrared light source 120 emits light at a wavelength of about 1000 nm to about 1200 nm. In some embodiments, infrared light source 120 emits light at a wavelength of about 1050 nm to about 1250 nm. In some embodiments, infrared light source 120 emits light at a wavelength of about 1600 nm to about 2000 nm. In some embodiments, infrared light source 120 emits light at a wavelength of about 850 nm to about 950 nm. In some embodiments, infrared light source 120 emits light at a wavelength of about 900 nm to about 1000 nm. In some embodiments, infrared light source 120 emits light at a wavelength of about 1200 nm to about 1700 nm. In some embodiments, infrared light source 120 emits light at a wavelength of about 850 nm, 880 nm, 940 nm, 1050 nm, 1250 nm, 1550 nm, 1650 nm, or combinations thereof. In some embodiments, infrared light source 120 emits light at a wavelength of about 940 nm and about 1250 nm. In some embodiments, the overall intensity of infrared light emitted by infrared light sources 120 is safe for prolonged use with humans, particularly babies. In some embodiments, the overall intensity of infrared light emitted by infrared light sources 120 is less than about 530 W/m.sup.2.

[0020] In some embodiments, at least one infrared light intensity sensor 130 is positioned on substrate 110 and configured to detect intensities of infrared light incident from the human stomach. In some embodiments, infrared light intensity sensor 130 is configured to detect changes in infrared light intensity during the course of a feeding, as will be discussed in greater detail below. In some embodiments, infrared light intensity sensor 130 is a High Dynamic Range Digital light sensor. In some embodiments, infrared light intensity sensor 130 is an Adafruit® TSL light sensor. In some embodiments, infrared light intensity sensor 130 is a TSL2591 light sensor. In some embodiments, infrared light intensity sensor 130 is positioned on the same substrate 110 as infrared light source 120. In some embodiments, infrared light intensity sensor 130 is positioned on another substrate 110 from infrared light source 120. In some embodiments, infrared light intensity sensor 130 is positioned adjacent to infrared light source 120. In some embodiments, infrared light source 120 and infrared light intensity sensor 130 are positioned on substrate 110 such that each interface with the skin proximate the human stomach.

[0021] Referring now to FIG. 1B, in some embodiments, system 100 includes a barrier 140 positioned to limit detection of infrared light directly from infrared light source 120 by infrared intensity sensor 130. In some embodiments, barrier 140 includes a reflective layer 140A. In some embodiments, system 100 includes one or more additional sensors including a heart rate sensor, a respiratory sensor, a temperature sensor, etc., or a combination thereof.

[0022] Referring now to FIG. 2, system 100 includes a non-transitory computer storage medium 200 in communication with infrared light intensity sensor 130 and encoded with one or more computer programs 210 for outputting a volume ingested by a human. Non-transitory computer storage medium 200 includes one or more processing units and system memory. The non-transitory computer storage medium 200 is any suitable type of computer for executing one or more computer programs 210 to facilitate acquisition and analysis of light intensity data and export of ingested volume data, as is known to those having skill in the art.

[0023] In some embodiments, one or more computer programs 210 include a light intensity calculation module 220 configured to identify an initial intensity of infrared light incident from the human stomach. The initial intensity establishes a baseline value of infrared light incident from the stomach, a value that will change as the baby ingests milk during the course of the feeding. In some embodiments, the initial light intensity is measured at a first instance. In some embodiments, the feeding begins at a time t=0. In some embodiments, the first instance occurs t<0. In some embodiments, the first instance occurs t=0. In some embodiments, the first instance occurs just after t=0. In some embodiments, light intensity calculation module 220 is configured to identify at least one feeding intensity of infrared light incident from the human stomach. In some embodiments, the feeding intensity is measured at a second instance. In some embodiments, a plurality of feeding intensities are measured during the course of a feeding. In some embodiments, the feeding stops at an endtime (t=E). In some embodiments, the second instance occurs at t≥0. In some embodiments, the second instance occurs at t≤E. In some embodiments, the second instance occurs just before t=E. In some embodiments, the second instance occurs at t=E. In some embodiments, light intensity calculation module 220 is configured to determine a ratio of the feeding intensity to the initial intensity. The ratio of the feeding intensity to the initial intensity is the measure of how the ingestion of a volume, i.e., e.g., the breast milk, is affecting the quantity of infrared light incident from the human stomach. In some embodiments, light intensity calculation module 220 calculates a plurality of these ratios corresponding to a plurality of feeding intensity measurements taken during a feeding. In some embodiments, feeding intensity measurements are taken continuously, as will be discussed in greater detail below. In some embodiments, the ratio of the feeding intensity to the initial intensity is calculated continuously.

[0024] In some embodiments, one or more computer programs 210 include a volume calculation module 230 configured to output a value for the volume ingested into the human stomach between the first instance and the second instance that corresponds to the ratio of the at least one feeding intensity to the initial intensity at the second instance, as will be discussed in greater detail below. In some embodiments, this volume value is calculated for each ratio of the feeding intensity to the initial intensity that is calculated. In some embodiments where the ratio of the feeding intensity to the initial intensity is calculated continuously, the volume value is also calculated continuously. In some embodiments, the volume value is output to a computer device 240 for display to a user, e.g., a doctor, nurse, parent, etc. In some embodiments, computer device 240 is a smart phone, tablet computer, desktop computer, personal digital assistant (“PDA”), and the like.

[0025] In some embodiments, system 100 includes a microcontroller system 250 providing power to and control over the infrared light intensity sensor 130 and infrared light source 120. In some embodiments, microcontrollers system 250 includes a data communication module 260 configured to enable communication of calculated light intensities and calculated volumes to the one or more databases from the light intensity calculation module and the volume calculation module. In some embodiments, microcontroller system 250 controls the intensity of infrared light source 120. In some embodiments, microcontroller 250 controls when infrared light source 120 is set to “ON,” e.g., so that the light source need not be on during the entire duration of a feeding.

[0026] In some embodiments, system 100 includes one or more databases 270 including historical light intensity data from light intensity calculation module 220 and volume ingestion data from volume calculation module 230. The microcontroller system 250 can be any suitable controller setup suitable for powering and controlling infrared light intensity sensor 130 and infrared light source 120. In some embodiments, microcontroller system 250 is a Lilypad™ (Arduino, LLC, Somerville, Mass.). In some embodiments, microcontroller system 250 and non-transitory computer storage medium 200 are one and the same.

[0027] The volume ingested at a given instance during a feeding is correlated with the ratio of the feeding intensity to the initial intensity. In some embodiments, the correlation between the volume ingested and the light intensities measured by infrared light intensity sensor 130 is defined by the following Formula I:

V=(log(I/I.sub.o)+0.0036)/0.0007  Formula I

wherein I.sub.o is the initial intensity of infrared light incident from the human stomach and I is the at least one feeding intensity of infrared light incident from the human stomach. In some embodiments, system 100 is calibrated for each individual human, e.g., each baby that uses the system. In some embodiments, the calibration is based on age, weight, waist size, etc., or combinations thereof. Formula I was determined experimentally as follows.

EXAMPLE

[0028] The light source used was an infrared LED at 940 nm and the light sensor was an Adafruit® High Dynamic Range Digital Light Sensor TSL2591 (Adafruit Industries, New York, N.Y.). The source and receiver are placed adjacent to each other across the stomach of a phantom baby. The receiver was connected to a LilyPad™ having a power source, which returned the volume of milk in the infant stomach to the computer. Experiments were conducted as follows: the baby doll used was fitted with a clear plastic bag to represent the stomach of the phantom baby. The plastic bag was filled with 150 mL of water to simplify the contents of the human stomach. The plastic stomach region of the doll was covered by porcine skin to represent subcutaneous tissue. The sensor and LED source were placed adjacent to each other on top of the porcine skin. Using a funnel and a graduated cylinder, milk was poured into the infant simulating a sip of milk in increments of 2.5 mL starting at 0 mL to 60 mL of milk. The changes in infrared light intensity (I) were measured and transferred into a table. From the table, a graph was constructed of log(I/Io) on the y-axis and volume on the x-axis, with (I.sub.o) representing the initial intensity of infrared light at 0 mL of milk. After multiple experiments, an average of intensity ratios was obtained for each volume of milk in mL (V). These values were used to construct a graph to obtain an equation relating volume and intensity correlation. Experimentation and collected results show a linear relationship between the ratio of infrared light intensity and volume of milk depicted in Formula I.

[0029] Some aspects of the present disclosure are directed to a method 300 for quantifying a volume ingested by a human during a feeding. At 302, at least one infrared light source and at least one infrared light intensity sensor are provided. At 304, the at least one infrared light source is positioned proximate a human stomach. At 306, the at least one infrared light intensity sensor is positioned to detect intensities of infrared light provided by the at least one infrared light source and incident from the human stomach. At 308, infrared light is emitted from the at least one infrared light source to a human stomach. In some embodiments, infrared light is emitted from the at least one infrared light source to the skin proximate the human stomach. In some embodiments, the infrared light is emitted at a wavelength of about 940 nm.

[0030] At 310, an initial intensity of infrared light incident from the human stomach is measured with the at least one infrared light intensity sensor at a first instance. In some embodiments, measured amount of infrared light is the sum total of all infrared light measured by one or more infrared light sensors. As discussed above, in some embodiments, the first instance is prior to, at, or near the beginning of a feeding. At 312, at least one feeding intensity of infrared light incident is measured from the human stomach with the at least one infrared light intensity sensor at a second instance. As discussed above, in some embodiments, the second instance is during, near the end, at the end, or after the end of feeding. In some embodiments, the feeding intensity of infrared light is calculated continuously. At 314, a volume ingested into the human stomach between the first instance and the second instance that corresponds to the ratio of the at least one feeding intensity to the initial intensity is calculated. In some embodiments, the volume ingested is calculated continuously. As discussed above, in some embodiments, the volume ingested is defined by Formula I. In some embodiments, at 316 the volume ingested is displayed to a user, e.g., via a computer device.

[0031] Methods and systems of the present disclosure advantageously provide an accurate system for measuring the actual volume of milk ingested by a baby during a breastfeeding session. The accuracy of the formula for converting measured infrared light intensities to volume provides the user with confidence in the data reported to the user. That the incident infrared light measured by the infrared light sensor is not affected by natural processes such as swallowing air, voiding during feedings, and spitting up that occur during feedings provides further confidence. The systems and methods are also truly non-invasive. There are no wires placed directly on the baby and there is no interference with the physical breastfeeding process, increasing comfort for both mom and baby. Finally, the systems and methods visualize the feeding in real-time, allowing parent to confirm whether or not a feeding is progressing successfully. Feeding data is also stored and tracked so that parents and other individuals, e.g., the baby's doctor, can view historical trends in the baby's feeding over time. The systems and methods of the present disclosure are particularly advantageous for premature babies, those born with complications, or those living in third world countries with limited resources.

[0032] Although the disclosed subject matter has been described and illustrated with respect to embodiments thereof, it should be understood by those skilled in the art that features of the disclosed embodiments can be combined, rearranged, etc., to produce additional embodiments within the scope of the invention, and that various other changes, omissions, and additions may be made therein and thereto, without parting from the spirit and scope of the present invention.