Ultrasonic monitor for measuring heart and pulse rates

• US 7,547,282 B2
• Filed: 01/14/2004
• Issued: 06/16/2009
• Est. Priority Date: 01/15/2003
• Status: Expired due to Fees

• Current Assignee: Salutron, Inc.
• Original Assignee: Salutron, Inc.
• Inventors: Escorcio, Tolentino, Chang, Ron Jong, Lo, Thomas Ying-Ching
• Primary Examiner(s): Le; Long V
• Assistant Examiner(s): RAMIREZ, JOHN FERNANDO
• Application Number:
  US10/758,608
• Publication Number:
  US 20040167409A1
• Time in Patent Office: 1,980 Days
• Field of Search: 600/437, 600/453, 600/459, 600/465, 600/443, 600/485
• US Class Current: 600/459
• CPC Class Codes: A61B 5/02438 with portable devices, e.g. worn by the patient
• CPC Class Codes: A61B 5/681 Wristwatch-type devices
• CPC Class Codes: A61B 8/02 Measuring pulse or heart rate
• CPC Class Codes: A61B 8/4281 characterised by sound-transmitting media or devices for coupling the transducer to the tissue
• CPC Class Codes: A61B 8/4472 Wireless probes

Abstract

The invention provides an ultrasonic monitor for measuring pulse rate values in a living subject, including a module with at least one source of ultrasonic energy, a gel pad comprised of a polymer and from about 50 to about 95% by weight of an ultrasound conductive diluent, wherein the gel pad is positioned in direct contact between the module and the living subject; an ultrasonic energy detector and associated hardware and software for detecting, calculating and displaying a readout of the measured rate values.

Claims

1. An ultrasonic monitor for measuring pulse rate values in a living subject, comprising:

a) at least one source of ultrasonic energy;

b) a gel pad comprised of a thermoplastic elastomer and from about 50 to about 95% by weight of an ultrasound conductive diluent, said gel pad is positioned to be directly between the energy source and the living subject, said gel pad is characterized by having needle penetration from about 5 to about 300 ( 1/10 mm) according to ASTM D15;

c) an ultrasonic energy detector;

d) a microcontroller, responsive to the ultrasonic energy detector, which detects and calculates the pulse rate; and

e) a display unit, responsive to the microcontroller, which displays a readout of the pulse rate.

2. The ultrasonic monitor of claim 1, wherein:

said gel pad is characterized by having needle penetration from about 25 to about 300.

3. The ultrasonic monitor of claim 1, wherein:

said gel pad is characterized by having needle penetration from about 30 to about 150.

4. The ultrasonic monitor of claim 1, wherein:

said thermoplastic elastomer is a styrene-butadiene-styrene block copolymer.

5. The ultrasonic monitor of claim 1, wherein:

said thermoplastic elastomer is a styrene-isoprene-styrene block copolymer.

6. The ultrasonic monitor of claim 1, wherein:

said thermoplastic elastomer is a styrene/ethylene-co-butylene/styrene block copolymer.

7. The ultrasonic monitor of claim 1, wherein:

said thermoplastic elastomer is a styrene/ethylene-co-propylene/styrene block copolymer.

8. The ultrasonic monitor of claim 1, wherein:

said thermoplastic elastomer is an ethylene/ethylene-co-butylene/ethylene block copolymer.

9. The ultrasonic monitor of claim 1, wherein:

said ultrasound conducting diluent is selected from the group consisting of dibutyl phthalate, dioctyl phthalate, mineral oils, naphthenic oils, paraffinic oils, polybutenes, and vegetable oils.

10. The ultrasonic monitor of claim 1, wherein:

said at least one source of ultrasonic energy, said gel pad, said ultrasonic energy detector and said microcontroller are part of a wristwatch assembly.

11. The ultrasonic monitor of claim 1, wherein:

the source of ultrasonic energy and the ultrasonic energy detector are located within a first module and communicate by wireless transmission with the display unit.

12. The ultrasonic monitor of claim 11, wherein:

said first module is part of a wristwatch.

13. The ultrasonic monitor of claim 11, wherein:

the display unit is housed in a second module.

14. The ultrasonic monitor of claim 13, wherein:

the second module is part of a wristwatch.

15. The ultrasonic monitor of claim 1, wherein:

the source of ultrasonic energy and the ultrasonic energy detector are located within a first module and are hardwired to the display unit.

16. The ultrasonic monitor of claim 15, wherein:

said first module is part of a wristwatch.

17. An ultrasonic monitor of claim 1, wherein:

the source of ultrasonic energy and the ultrasonic energy detector are held in place by a head band.

18. The ultrasonic monitor of claim 1, wherein:

the source of ultrasonic energy and the ultrasonic energy detector comprises first and second piezoelectric crystals positioned at an angle to each other, the angle determined based on the distance of the source of ultrasonic energy to a target.

19. The ultrasonic monitor of claim 18, wherein:

the first piezoelectric crystal is energized by an original ultrasound frequency signal;

the original ultrasound frequency signal is reflected off said target and received by the second piezoelectric crystal; and

the received ultrasound frequency signal is higher or lower than said original ultrasound frequency signal depending on direction and speed of fluid flow.

20. The ultrasonic monitor of claim 19, wherein:

the original ultrasonic frequency signal has a frequency of 2 MHz or lower.

21. The ultrasonic monitor of claim 19, wherein:

the first and second piezoelectric crystals are positioned in a wristwatch proximate to a radial artery of a subject.

22. The ultrasonic monitor of claim 19, wherein:

the first and second piezoelectric crystals are positioned proximate to an ulnar artery of a subject.

23. The ultrasonic monitor of claim 19, wherein:

the first and second piezoelectric crystals are inclined at a roof angle relative to each other of between about 0 and 60°

.

24. The ultrasonic monitor of claim 19, wherein:

the first and second piezoelectric crystals are inclined at a roof angle relative to each other of between about 5 and 45°

.

25. The ultrasonic monitor of claim 19, wherein:

the first and second piezoelectric crystals are separated by a distance of between about 0.5 and 20 mm.

26. The ultrasonic monitor of claim 19, wherein:

the first and second piezoelectric crystals are separated by a distance of between about 1.0 and 10 mm.

27. The ultrasonic monitor of claim 1, wherein:

the source of ultrasonic energy and the ultrasonic energy detector are positioned within a module that is inclined relative to a target.

28. The ultrasonic monitor of claim 27, wherein:

an inclination of the module results from an angular shape of the gel pad.

29. The ultrasonic monitor of claim 28, wherein:

the gel pad has a trapezoidal cross-sectional shape.

30. The ultrasonic monitor of claim 28, wherein:

the gel pad has a triangular cross-sectional shape.

31. The ultrasonic monitor of claim 1, wherein:

the hardware comprises a demodulator configured to convert a Doppler shift of a reflected ultrasound energy into a voltage.

32. The ultrasonic monitor of claim 31, wherein:

the demodulator comprises an FM demodulator.

33. The ultrasonic monitor of claim 31, wherein:

the demodulator comprises an AM demodulator.

34. The ultrasonic monitor of claim 31, wherein:

the demodulator comprises an RF mixer or a Gilbert cell.

35. A method for detecting pulse rates in a living subject, comprising:

(i) providing an ultrasonic monitor, said ultrasonic monitor comprises;

a) at least one source of ultrasonic energy,

b) a gel pad comprised of a thermoplastic elastomer and from about 50 to about 95% by weight of an ultrasound conductive diluent, wherein said gel pad is characterized by having needle penetration from about 5 to about 300 ( 1/10 mm) according to ASTM D15;

wherein said gel pad is positioned directly between the energy source and the living subject,

c) an ultrasonic energy detector, and

d) means for detecting and calculating the pulse rate and displaying a readout of the pulse rate; and

(ii) contacting said ultrasonic monitor with the living subject at a point where the pulse rate is to be measured; and

(iii) measuring the pulse rate of the living subject with said ultrasonic monitor contacting the living subject.

36. The method of claim 35, wherein:

said living subject is a human.

37. A method of claim 35, wherein:

said contacting includes contacting said ultrasonic monitor to the subject on a radial or ulnar artery.

38. A method of claim 35, wherein:

said pulse rate is based on at least one of heart rate, blood flow rate, fetal heart rate, and fetal blood flow rate.

39. The method of claim 35, wherein:

the source of ultrasonic energy and the ultrasonic energy detector are provided in a module, separated by a distance of between about 0.5 and 20 mm and inclined relative to one another at a roof angle of between about 0 and 60°

.

40. The method of claim 39, wherein:

the module is inclined by resting on an angular shape of the gel pad.