Oximeter sensor assembly with integral cable and method of forming the same

• US 5,041,187 A
• Filed: 10/01/1990
• Issued: 08/20/1991
• Est. Priority Date: 04/29/1988
• Status: Expired due to Term

• Current Assignee: Masimo Corporation
• Original Assignee: Thor Technology Corp.
• Inventors: Hink, Karl M., Polczynski, Mark H.
• Primary Examiner(s): Powell, William A.
• Application Number:
  US07/591,552
• Time in Patent Office: 323 Days
• Field of Search: 156/629, 156/630, 156/633, 156/634, 156/656, 156/659.1, 156/902, 29/828, 29/832, 29/846, 128/633, 128/640, 128/665, 128/667, 361/398, 174/68.1, 174/68.5, 428/209, 428/601, 428/901
• US Class Current: 216/4
• CPC Class Codes: A61B 2562/227 Sensors with electrical connectors
• CPC Class Codes: A61B 5/14552 Details of sensors specially adapted therefor
• CPC Class Codes: A61B 5/6826 Finger
• CPC Class Codes: A61B 5/6838 Clamps or clips
• CPC Class Codes: H05K 1/118 specially for flexible printed circuits, e.g. using folded portions
• CPC Class Codes: H05K 1/189 characterised by the use of a flexible or folded printed circuit H05K3/326 takes precedence
• CPC Class Codes: H05K 2201/0715 provided by an outer layer of PCB
• CPC Class Codes: H05K 2201/10106 Light emitting diode [LED]
• CPC Class Codes: H05K 2201/10151 Sensor
• CPC Class Codes: H05K 2201/10651 Component having two leads, e.g. resistor, capacitor
• CPC Class Codes: H05K 3/3421 Leaded components
• CPC Class Codes: Y10S 428/901 Printed circuit
• CPC Class Codes: Y10T 29/49123 Co-axial cable
• CPC Class Codes: Y10T 29/4913 Assembling to base an electrical component, e.g., capacitor, etc.
• CPC Class Codes: Y10T 29/49155 Manufacturing circuit on or in base
• CPC Class Codes: Y10T 428/24917 including metal layer

Abstract

An oximeter sensory assembly (40) includes a thin elongated flexible sheet-like strip (42) having an integral end portion (44) flexibly wrapping at least partially around a human body part (26), a plurality of electrical conductors (46-50) on the strip, and light emitting and receiving electrical components (28a, 30a) mounted on the strip on the end portion and electrically connected to the conductors. Flexible conductive encompassing shielding layers (62, 66) are also provided, together with outer insulating layers (61, 67). Connection adapter structure (94) is also provided.

Claims

1. A method for making an oximeter sensor assembly with integral cable comprising:

providing thin elongated flexible sheet electrically insulating substrate strip means having an end portion for flexibly wrapping at least partially around a human body part;

forming a plurality of conductors on said substrate strip means;

providing a light emitting electrical component and a light receiving electrical component and mounting said components on said substrate strip means at said end portion and electrically connecting said components to respective said conductors, said light emitting electrical component emitting light through said human body part, said light receiving electrical component receiving said light;

covering said conductors with thin elongated flexible sheet electrically insulating film means.

2. The invention according to claim 1 comprising depositing said conductors on said substrate strip.

3. A method for making an oximeter sensor assembly with integral cable comprising:

providing a thin elongated flexible sheet electrically insulating substrate strip having an electrically conductive layer thereon and having an end portion for flexibly wrapping at least partially around a human body part;

removing portions of said conductive layer to leave a plurality of conductors on said substrate strip;

providing a light emitting electrical component and a light receiving electrical component and mounting said components on said substrate strip at said end portion and electrically connecting said components to respective said conductors, said light emitting electrical component emitting light through said human body part, said light receiving electrical component receiving said light;

covering said conductors with thin elongated flexible sheet electrically insulating film means.

4. A method for making an oximeter sensor assembly with integral cable comprising:

providing thin elongated flexible sheet electrically insulating substrate strip means having an end portion for flexibly wrapping at least partially around a human body part;

forming a plurality of electrical conductors on said substrate strip;

providing a light emitting electrical component and a light receiving electrical component and mounting said components on said substrate strip at said end portion and electrically connecting said components to respective said conductors, said light emitting electrical component emitting light through said human body part, said light receiving electrical component receiving said light;

covering said conductors with thin elongated flexible sheet electrically insulating film means;

applying thin elongated flexible sheet electrically conductive film means around said substrate strip means, said conductors and said insulating film means, to provide electromagnetic interference shielding of said conductors;

applying thin elongated flexible sheet electrically insulating film means around said conductive film means.

5. The invention according to claim 4 comprising providing said insulating substrate strip means with an electrically conductive film along its underside, and wherein said first mentioned step of applying said conductive film means comprises covering said first mentioned insulating film means with said first mentioned conductive film means and making electrical contact between said first and second conductive film means at their laterally outward edges, such that an electrically conductive film surrounds said substrate strip means and said ribbons and provides said electromagnetic shielding.

6. A low cost thin elongated flexible electrical cable comprising:

a first layer comprising thin elongated flexible sheet electrically insulating strip means;

a second layer on said first layer and comprising thin elongated flexible sheet electrically conductive strip means;

a third layer on said second layer and

comprising thin elongated flexible sheet electrically insulating strip means;

a fourth layer on said third layer and comprising a plurality of electrical conductors;

a fifth layer on said fourth layer and comprising thin elongated flexible sheet electrically insulating strip means;

a sixth layer on said fifth layer and comprising thin elongated flexible sheet electrically conductive strip means;

a seventh layer on said sixth layer and comprising thin elongated flexible sheet electrically insulating strip means;

said second and sixth layers being in electrical contact with each other and providing electromagnetic interference shielding of said conductors.

7. The invention according to claim 6 wherein said third and fifth layers have an aligned gap therein separating one or more said conductors on the lateral right side of said gap, and one or more said conductors on the lateral left side of said gap, and wherein said second and sixth layers engage each other in electrical contact in said gap.

8. The invention according to claim 7 wherein:

said first and seventh layers have lateral widths greater than said second and sixth layers and extend laterally beyond said second and sixth layers;

said first and seventh layers engage each other along their laterally outward edges;

said second and sixth layers have lateral widths greater than said third and fifth layers and extend laterally beyond said third and fifth layers;

said second and sixth layers engage each other along their laterally outward edges, in addition to engagement of said second and sixth layers in said aligned gap in said third and fifth layers, such that the electromagnetic interference shield provided by said second and sixth layers extends around all said conductors and also has a portion extending around and shielding said conductors on said lateral right side of said gap, and also has another portion extending around and shielding said conductors on said lateral left side of said gap.

9. The invention according to claim 8 wherein said third and fifth layers each have left and right portions laterally separated by said gap, and wherein said right portions of said third and fifth layers extend laterally rightwardly beyond the lateral extent of said conductors on said lateral right side of said gap, and wherein said right portions of said third and fifth layers engage each other along their laterally outward right edges, and wherein said left portions of said third and fifth layers extend laterally leftwardly beyond the lateral extent of said conductors on said lateral left side of said gap, and wherein said left portions of said third and fifth layers engage each other along their laterally outward left edges.

10. The invention according to claim 6 wherein said fifth layer has a gap therein separating one or more said conductors on the lateral right side of said gap, and one or more said conductors on the lateral left side of said gap, and comprising a conductor in said gap and contacted by said sixth layer thereabove, such that said last mentioned conductor provides a shield connection to the electromagnetic interference shield provided by said second and sixth layers.

11. The invention according to claim 10 wherein:

said first and seventh layers have lateral widths greater than said second and sixth layers and extend laterally beyond said second and sixth layers;

said first and seventh layers engage each other along their laterally outward edges;

said second and sixth layers have lateral widths greater than said third and fifth layers and extend laterally beyond said third and fifth layers;

said second and sixth layers engage each other along their laterally outward edges.

12. The invention according to claim 11 wherein said fifth layer has right and left portions laterally separated by said gap, and wherein said third layer is continuous and extends beneath each of said conductors including said conductor in said gap, and wherein said third and fifth layers extend laterally outwardly beyond the lateral extent of said conductors and engage each other along their laterally outward edges and also engage each other adjacent said gap.

13. The invention according to claim 6 wherein said cable has a longitudinal end at which said first, second, third and fourth layers extend longitudinally beyond said fifth, sixth and seventh layers, and comprising connector means engaging said extended end of said cable and electrically contacting said conductors.

14. The invention according to claim 13 wherein said connector means comprises an insulating connector strip having a plurality of electrical conductors extending parallel to said first mentioned set of conductors, and interconnect structure between and engaging said first and second mentioned sets of conductors, said interconnect structure comprising a plurality of thin electrically conductive sheets interleaved with a plurality of thin electrically insulating sheets, each sheet extending generally vertically and longitudinally parallel to said conductors, each sheet having a lateral width less than the lateral width of each said conductor and less than the lateral gap between said conductors, such that electrical contact from a conductor of said first set is made through one of said conductive sheets to a conductor of said second set, and such that at least one electrically insulating said sheet is laterally between the next conductor to the lateral side thereof to prevent electrical shorting.

15. The invention according to claim 13 wherein said third layer has a gap therein at said extending longitudinal cable end portion exposing said second layer, and wherein said connection means also contacts said second layer at said longitudinal end to electrically contact said shield.

16. The invention according to claim 13 wherein one of said third an fifth layers has a gap therein and wherein one of said conductors is in said gap and contacts the respective one of said sixth and second layers, and wherein said connection means also electrically contacts said last mentioned conductor to make electrical contact to said shield.