CUFF FOR DETERMINING A PHYSIOLOGICAL PARAMETER

• US 20100317945A1
• Filed: 07/20/2007
• Published: 12/16/2010
• Est. Priority Date: 07/20/2007
• Status: Abandoned Application

• Current Assignee: Bmeye B.V. (Edwards Lifesciences Corporation)
• Original Assignee: Bmeye B.V. (Edwards Lifesciences Corporation)
• Inventors: Schraa, Olaf, Settels, Jos J.G.M., Schraa, Bob
• Application Number:
  US12/669,895
• Publication Number:
  US 20100317945A1
• Time in Patent Office: Days
• US Class Current: 600/324
• CPC Class Codes: A61B 5/02241 of small dimensions, e.g. adapted to fingers
• CPC Class Codes: A61B 5/02422 within occluders
• CPC Class Codes: A61B 5/029 Measuring or recording blood output from the heart, e.g. minute volume A61B8/065 takes precedence
• CPC Class Codes: A61B 5/1455 using optical sensors, e.g. spectral photometrical oximeters
• CPC Class Codes: A61B 5/6826 Finger
• CPC Class Codes: A61B 5/6838 Clamps or clips

Abstract

The invention relates to a cuff (20) for determining a physiological parameter, said cuff comprising a photoplethysmograph arranged with an emitter (6) for emitting a radiation in a direction of a tissue to be investigated, a detector (5) for detecting the radiation from the tissue and an inflatable bladder (8) for transferring pressure to the tissue, said inflatable bladder comprising a back-layer (8″) and a top-layer (8′), wherein the top-layer is conceived to be brought into contact with the tissue, the top-layer being substantially more flexible than the back-layer. The invention further relates to a measurement system.

Claims

1. A cuff for determining a physiological parameter, comprising:

a photoplethysmograph arranged with

an emitter for emitting a radiation in a direction of a tissue to be investigated;

a detector for detecting the radiation from the tissue; and

an inflatable bladder for transferring pressure to the tissue, said inflatable bladder comprising a back-layer and a top-layer,

wherein the top-layer is conceived to be brought into contact with the tissue, and wherein the back-layer comprises a flexible substantially non-elastic material which does not undergo deformation a suitable internal cuff pressure and the top layer comprises a flexible substantially elastic material which undergoes deformation on under application of the suitable internal cuff pressure.

3. A cuff according to claim 1, wherein the top-layer is arranged to provide an electrical insulation between the tissue and electrical components of the cuff.

4. A cuff according to claim 1, wherein the top-layer is arranged to protect electrical components of the cuff from contamination.

5. A cuff according to claim 1 wherein the top-layer is at least partially manufactured from a biocompatible material.

6. A cuff according to claim 5, wherein the top-layer extends further than an area of the inflatable bladder conceived to come into contact with the tissue in use.

9. A cuff according to claim 1, wherein the height of the optical components (LED and photo diode) is adjustable.

14. A cuff according to claim 1, wherein the emitter is arranged for emitting a focused beam of radiation.

15. A cuff according to claim 1, wherein the emitter comprises a built-in opaque shield.

16. A cuff according to claim 1, wherein the emitter is arranged to emit radiation with a wavelength in a range of 660 to 1000 nm.

17. A cuff according to claim 1, wherein the detector comprises a photodiode arranged to be sensitive for a radiation with a wavelength matching at least part of a spectrum of the emitter.

18. A cuff according to claim 1, further comprising:

an air tube communicating with the inflatable bladder;

means for preventing blockage of an airflow in the air tube.

19. A cuff according to claim 18, wherein the air tube is cut at an angle less than 90 degrees and is mounted in the inflatable bladder with the longest projection towards the top-layer.

21. A measurement system comprising a cuff according to claim 1 and a data processing unit.

22. A measurement system according to claim 21, wherein the data processing unit is arranged to:

compute a compliance or impedance in dependence of at least one measurement of arterial pressure data and patient data using a non-linear model;

use said compliance or impedance in a pulse contour method for determining the beat-to-beat stroke volume or cardiac output based on the measured arterial pressure data.

2. (canceled)

7. A cuff according to clam 1, wherein the back-layer is provided with cut-away areas for transmitting the radiation from the emitter to a tissue or for transmitting a further radiation from the tissue to the detector.

8. (canceled)

10. (canceled)

11. (canceled)

12. (canceled)

13. (canceled)

20. (canceled)

23. (canceled)

24. (canceled)

25. (canceled)