Method and device for monitoring breastfeeding

• US 8,521,272 B2
• Filed: 01/21/2009
• Issued: 08/27/2013
• Est. Priority Date: 01/22/2008
• Status: Active Grant

• Current Assignee: Yeda Research and Development Co. Ltd. (Weizmann Institute of Science)
• Original Assignee: Yeda Research and Development Co. Ltd. (Weizmann Institute of Science)
• Inventors: Kapon, Ruti, Peled, Arik, Seifer, Shahar, Schneider, Revital
• Primary Examiner(s): Dougherty, Sean
• Assistant Examiner(s): Stout, Michael C
• Application Number:
  US12/863,604
• Publication Number:
  US 20100292604A1
• Time in Patent Office: 1,679 Days
• Field of Search: 600/547
• US Class Current: 600/547
• CPC Class Codes: A61B 5/0531 Measuring skin impedance
• CPC Class Codes: A61B 5/0535 Impedance plethysmography for measuring blood flow A61B5/0295
• CPC Class Codes: A61B 5/4288 mammary secretions
• CPC Class Codes: A61B 5/4312 Breast evaluation or disorder diagnosis A61B5/0091 takes precedence

Abstract

A method of monitoring amount of milk consumed by an infant being breastfed by a breast is disclosed. The method comprises: determining variations in electric capacitance of the breast during breastfeeding, and correlating the electric capacitance variations to an amount of milk consumed by the infant.

Claims

1. A method of monitoring amount of milk consumed by an infant being breastfed by a breast, comprising obtaining a multiplication between electric resistance of the breast and electric capacitance of the breast during breastfeeding, using a circuit for determining variations in said multiplication, and using a circuit for correlating said variations in said multiplication to an amount of milk consumed by the infant.

2. The method of claim 1, further comprising measuring said electric capacitance so as to determine said variations.

3. The method of claim 2, wherein said measurement of said electric capacitance is performed so as to estimate electric capacitance of an interior of the breast while reducing contribution of a skin of the breast to said electric capacitance.

4. The method of claim 1, wherein said determination of said variations comprises measuring a phase of voltage sampled from a skin of the breast in response to an electrical current applied to said skin.

5. The method of claim 4, wherein said phase is measured via at least four electrodes connected to a skin of the breast.

6. The method of claim 1, further comprising correcting said correlation using history data collected during previous breastfeeding sessions.

7. The method of claim 1, further comprising performing a calibration measurement prior to said breastfeeding so as to collect calibration data, wherein said multiplication is corrected based on said calibration data.

8. The method of claim 1, wherein said multiplication is determined for each of a plurality of frequencies, and wherein said amount of milk is correlated to a combination of at least two multiplications.

9. The method of claim 1, further comprising using said multiplication for searching over the breast for regions occupied clusters of alveoli.

10. The method of claim 2, wherein said multiplication is measured at a frequency of less than 100 MHz.

11. The method of claim 1, wherein said multiplication is determined using a plurality of electrodes, and wherein the method comprises employing at least one multiplexing cycle such that at different sub-cycles of said multiplexing cycle, a different set of electrodes is used for determining said multiplication.

12. The method of claim 11, further comprising using multiplication values measured during said at least one multiplexing cycle for determining measuring locations on the breast in future sessions.

13. The method of claim 11, further comprising analyzing multiplication values measured during said at least one multiplexing cycle so as to differentiate between measurement sensitivities in different depths in the breast.

14. A breastfeeding monitor system, comprising a measuring unit having circuit configured for measuring a multiplication between electric resistance of the breast and electric capacitance of a breast during breastfeeding, and a processing unit having circuit configured for determining variations in said multiplication and correlating said variations in said multiplication to an amount of milk consumed by an infant being breastfed by a breast.

15. The system of claim 14, wherein said measuring unit is configured for measuring contribution of an interior of the breast for said multiplication, while reducing contribution of a skin of the breast to said multiplication.

16. The system of claim 14, wherein said measuring unit is configured for determining said multiplication based on a phase of a voltage sampled from a skin of the breast in response to an electrical current applied to said skin.

17. The system of claim 16, wherein said measuring unit comprises at least four electrodes connectable to a skin of the breast.

18. The system of claim 14, further comprising a memory medium for storing history data collected in previous breastfeeding sessions, wherein said processing unit is configured for correcting said correlation using said history data.

19. The system of claim 14, wherein said multiplication is measured at a frequency of less than 100 MHz.

20. The system of claim 14, wherein said multiplication is measured using a plurality of electrodes, and wherein the system comprises a controller for employing at least one multiplexing cycle such that at different sub-cycles of said multiplexing cycle, a different set of electrodes is used for measuring said multiplication.

21. The system of claim 20, wherein said processing unit is configured for using multiplication values measured during said at least one multiplexing cycle so as to determine measuring locations on the breast in future sessions.

22. The system of claim 20, wherein said processing unit is configured for analyzing multiplication values measured during said at least one multiplexing cycle so as to differentiate between measurement sensitivities in different depths in the breast.

23. A method of monitoring amount of milk consumed by an infant being breastfed by a breast, comprising obtaining electric capacitance of the breast during breastfeeding, using a circuit for determining variations in said electric capacitance of the breast, and using a circuit for correlating said electric capacitance variations to an amount of milk consumed by the infant.

24. The method of claim 23, further comprising subtracting contribution of a skin of the breast to said electric capacitance.

25. The method of claim 24, wherein said contribution of said skin to said electric capacitance and an overall electric capacitance of the breast are measured by different electrical circuitries.

26. The method of claim 24, further comprising measuring a thickness of said skin, wherein said contribution of said skin to said electric capacitance is estimated based on said thickness.

27. The method of claim 23, wherein said electric capacitance is measured by a capacitance measuring device devoid of electrical contact with the skin.

28. The method of claim 23, wherein said electric capacitance is measured, at least partially, by at least one device selected from the group consisting of a capacitance bridge, an LCR meter and an oscillation frequency measuring device.

29. The method of claim 23, wherein said measurement of said electric capacitance comprises measuring a phase of voltage sampled from a skin of the breast in response to an electrical current applied to said skin.

30. The method of claim 23, further comprising measuring electric resistance of the breast, and calculating a multiplication between said electric resistance and said electric capacitance.

40. The system of claim 25, wherein said capacitance measuring unit is configured for determining said capacitance based on a phase of a voltage sampled from a skin of the breast in response to an electrical current applied to said skin.

31. A breastfeeding monitor system, comprising a capacitance measuring unit having circuit configured for measuring electric capacitance of a breast during breastfeeding, and a processing unit having circuit configured determining variations in said electric capacitance and correlating said electric capacitance variations to an amount of milk consumed by an infant being breastfed by a breast.

32. The system of claim 31, further comprising a resistance measuring unit having circuit configured for measuring electric resistance of the breast, wherein said processing unit is configured for calculating a multiplication between said electric resistance and said electric capacitance, and wherein said amount of milk is correlated to on said multiplication.

33. The system of claim 32, wherein said processing unit is configured for correcting said multiplication based on calibration data collected prior to said breastfeeding.

34. The system of claim 32, wherein said electric resistance and said electric capacitance are measured at a plurality of frequencies, wherein said multiplication is performed for each of said plurality of frequencies, and wherein said amount of milk is correlated to a combination of at least two multiplications.

35. The system of claim 31, wherein said processing unit is configured for subtracting contribution of a skin of the breast to said electric capacitance.

36. The system of claim 35, wherein said capacitance measuring unit comprises a skin capacitance measuring circuitry configured for measuring said contribution of said skin, and an overall capacitance measuring circuitry configured for measuring an overall electric capacitance of the breast.

37. The system of claim 35, further comprising a skin thickness measuring device for measuring a thickness of said skin, wherein said processing unit is configured for estimating said contribution of said skin to said electric capacitance based on said thickness.

38. The system of claim 31, wherein said capacitance measuring unit is configured to measure said electrical capacitance while being electrically isolated from the skin of the breast.

39. The system of claim 31, wherein said capacitance measuring unit comprises at least one device selected from the group consisting of a capacitance bridge, an LCR meter and an oscillation frequency measuring device.