Pulse oximetry sensor

• US 20050197550A1
• Filed: 01/04/2005
• Published: 09/08/2005
• Est. Priority Date: 01/05/2004
• Status: Active Grant

• Current Assignee: Masimo Corporation
• Original Assignee: Masimo Corporation
• Inventors: Al-Ali, Ammar, Diab, Mohamed Kheir, Schmidt, John, Schulz, Chris, Coverston, Ronald, Maurer, Garrick
• Granted Patent: US 7,280,858 B2
• Time in Patent Office: Days
• US Class Current: 600/323
• CPC Class Codes: A61B 2562/222 Electrical cables or leads therefor, e.g. coaxial cables or ribbon cables
• CPC Class Codes: A61B 5/14552 Details of sensors specially adapted therefor

Abstract

A pulse oximetry sensor has an emitter adapted to transmit optical radiation of at least two wavelengths into a tissue site and a detector adapted to receive optical radiation from the emitter after tissue site absorption. A tape assembly is adapted to attach the emitter and detector to the tissue site. A flexible housing is disposed around and optically shields the detector.

Claims

1. A pulse oximetry sensor comprising:

an emitter adapted to transmit optical radiation of at least two wavelengths into a tissue site;

a detector adapted to receive optical radiation from said emitter after tissue site absorption;

a tape assembly adapted to attach said emitter and said detector to said tissue site; and

a flexible housing disposed around and optically shielding said detector.

2. The pulse oximetry sensor according to claim 1 wherein said housing comprises:

a base;

a cover extending from said base; and

a pocket defined by said cover and adapted to receive said detector, said pocket raised above said base.

3. The pulse oximetry sensor according to claim 2 wherein said housing further comprises an aperture defined by said base so as to form an optical cavity that allows light originating from said emitter and absorbed by said tissue site to reach said detector while rejecting optical noise.

4. The pulse oximetry sensor according to claim 3 wherein said housing further comprises an opening defined in said base and configured to allow said detector to insert into said pocket.

5. The pulse oximetry sensor according to claim 4 wherein said housing further comprises a flange disposed around the periphery of said cover.

6. The pulse oximetry sensor according to claim 5 wherein said housing further comprises a flange providing structure to secure said housing to said tape assembly.

7. The pulse oximetry sensor according to claim 6 further comprising a cable assembly adapted to provide electrical communications between a pulse oximetry monitor and said emitter and said detector, a strain relief portion of said housing configured for a cable portion of said cable assembly.

8. The pulse oximetry sensor according to claim 7 wherein said housing is molded from an opaque, gray, medical grade PVC.

9. A pulse oximetry sensor comprising:

a detector adapted to receive optical radiation from an emitter after absorption by pulsatile blood flowing within a tissue site;

a shielded detector assembly having an EMI shield disposed around said detector;

a housing assembly having a flexible housing disposed around said shielded detector assembly; and

a tape assembly folded around said housing assembly and adapted to attach said detector and said emitter to said tissue site.

10. The pulse oximetry sensor according to claim 9 wherein said flexible housing comprises:

a base; and

a pocket raised above said base and retaining said shielded detector assembly,

said base defining an opening for said pocket and a generally circular aperture extending to said pocket.

11. The pulse oximetry sensor according to claim 10 wherein said aperture aligns with a grid portion of said EMI shield.

12. The pulse oximetry sensor according to claim 11 wherein said flexible housing further comprises a flange that secures said flexible housing to said tape assembly.

13. The pulse oximetry sensor according to claim 12 wherein said tape assembly comprises a tri-fold wrap having cutouts configured to accommodate said flexible housing.

14. The pulse oximetry sensor according to claim 13 wherein said tape assembly further comprises a face tape having a face tape aperture configured to accommodate said flexible housing.

15. A pulse oximetry sensor method comprising the steps of:

providing an emitter adapted to transmit optical radiation of at least two wavelengths into a tissue site;

providing a detector adapted to receive optical radiation from said emitter after absorption by pulsatile blood flowing within said tissue site;

incorporating said emitter and said detector within a cable assembly adapted to provide electrical communications between said emitter and said detector and a monitor;

EMI shielding said detector so as to reduce electromagnetic noise;

optically shielding said EMI shielded detector with an opaque, flexible housing so as to reduce optical noise from ambient light and piped light; and

disposing said cable assembly within a tape assembly adapted to attach said emitter and said detector to a tissue site.

16. The pulse oximetry sensor according to claim 15 wherein said optical shielding step comprises the substeps of:

enclosing said EMI shielded detector within said flexible housing so as to reduce ambient light; and

forming an optical cavity within said flexible housing so as to reduce piped light.

17. The pulse oximetry sensor according to claim 16 wherein said enclosing step comprises the substeps of:

defining a pocket within said flexible housing; and

inserting said EMI shielded detector into said pocket through an opening in a base of said flexible housing.

18. The pulse oximetry sensor according to claim 18 wherein said forming step comprises the substeps of:

raising said pocket above said base so as to recess said detector from said base; and

defining a generally circular aperture extending through said base to said pocket so as to allow optical radiation from said emitter that propagates through said tissue site to said aperture to reach said detector.

19. The pulse oximetry sensor according to claim 18 wherein said enclosing step comprises the further substep of aligning a light sensitive area of said EMI shielded detector with said aperture.

20. The pulse oximetry sensor according to claim 19 wherein said disposing step comprises the substep of securing a flange portion of said housing to said tape assembly.