Flexible multi-parameter cable

• US 5,491,299 A
• Filed: 06/03/1994
• Issued: 02/13/1996
• Est. Priority Date: 06/03/1994
• Status: Expired due to Term

• Current Assignee: Draeger Medical Systems Incorporated (Dragerwerk AG)
• Original Assignee: Siemens Medical Systems, Inc. (Siemens AG)
• Inventors: Muz, Edwin, Crouse, Helen C., Naylor, Thomas K.
• Primary Examiner(s): NIMMO, MORRIS
• Application Number:
  US08/253,518
• Time in Patent Office: 620 Days
• Field of Search: 174/36, 174/113 R, 174/115, 174/105 R
• US Class Current: 174/36
• CPC Class Codes: A61B 2562/222 Electrical cables or leads therefor, e.g. coaxial cables or ribbon cables
• CPC Class Codes: A61B 5/303 Patient cord assembly, e.g. cable harness
• CPC Class Codes: H01B 11/06 with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens

Abstract

A flexible multi-parameter conductor cable having coaxially symmetric elongated zones for signal carrying conductor placement therein, comprising an electrically conductive inner shield defining an electrically shielded inner longitudinal zone symmetrically disposed along and defining a center of said cable for containing at least one of a first type of signal carrying conductor, and an electrically conductive outer shield spaced a given distance symmetrically around said inner shield so as to define an electrically shielded outer longitudinal zone symmetrically disposed about said inner longitudinal zone for containing a plurality of at least a second type of signal carrying insulated conductor arranged in a single layer adjacent one another in said second longitudinal zone, said second type of conductor having an electrically conductive outer jacket in electrical contact with at least said outer shield.

Claims

1. A flexible multi-parameter conductor cable having coaxially symmetric elongated zones for signal carrying conductor placement therein, comprising:

an electrically conductive inner shield defining an electrically shielded inner longitudinal zone symmetrically disposed along and defining a center of said cable for containing at least one of a first type of signal carrying conductor; and

an electrically conductive outer shield spaced a given distance symmetrically around said inner shield so as to define an electrically shielded outer longitudinal zone symmetrically disposed about said inner longitudinal zone for containing a plurality of at least a second type of signal carrying insulated conductor arranged in a single layer adjacent one another as a group in said outer longitudinal zone, said second type of conductor having an electrically conductive outer jacket in electrical contact with said outer shield.

2. The cable of claim 1, wherein said first type of signal carrying conductor comprises a plurality of insulated conductors longitudinally arranged in a twisted manner with respect to each other.

3. The cable of claim 1, wherein the outer jackets of said conductors of said second type are positioned so as to also be in electrical contact with said inner shield, so as to define an additional electrically shielded outer longitudinal zone comprising that portion of said outer longitudinal zone which contains said group of adjacently positioned second type of conductors.

4. The cable of claim 3, further including a third type of signal carrying insulated conductor located in said outer longitudinal zone, which third type of signal carrying conductor comprises the following components, symmetrically arranged in the named order from a center of said third type of conductor:

a center electrical conductor surrounded by an electrically conductive shield layer spaced a given distance symmetrically around said center electrical conductor, and including a further insulation surrounding the conductive shield layer, with said second and third type of signal carrying conductors all having an outside diameter which is substantially the same.

5. The cable of claim 3, further including a single layer of a plurality of insulated conductors of a third type coupled to insulated conductors from a third type of sensor, said third type of insulated conductors being arranged adjacent one another between said inner and outer shields so as to be positioned in a group adjacent the group of said second type of conductors, with said second and third type of insulated conductors all having an outer diameter which is substantially the same.

6. The cable of claim 1, wherein said first type of signal carrying conductor comprises an air-tight hose for conducting an air pressure signal therein as an air pressure.

7. The cable of claim 6, wherein said air-tight hose includes an outer surface which is electrically conductive so as to define said inner shield.

8. The cable of claim 6, further including a third type of signal carrying insulated conductor located in said outer longitudinal zone, which third type of signal carrying conductor comprises the following components, symmetrically arranged in the named order from a center of said third type of conductor:

a center electrical conductor surrounded by an electrically conductive shield layer spaced a given distance symmetrically around said center electrical conductor, and including a further layer of electrical insulation surrounding the spaced electrically conductive shield layer, with said second and third type of insulated conductors all having substantially the same outside diameter.

9. A cable for use to connect insulated conductors from a plurality of different types of sensors to a monitoring device, wherein insulated conductors from a first type of said sensors are required to have signal handling characteristics which are different from insulated conductors from a second type of said sensors, said cable comprising:

a central portion including a plurality of insulated conductors of a first type adapted to be coupled to the insulated conductors from the first type of sensor, and longitudinally arranged so as to define a length of cable;

an inner tubular sheath which closely surrounds the central portion and extends along the length of the cable; and

an electrically conductive outer tubular sheath symmetrically disposed a given distance from said inner tubular sheath and extending along the length of the cable, with insulated conductors of a second type which have a low noise conductive outer sheath arranged adjacent one another in a single layer in a space between said inner and outer tubular sheaths with their outer jackets in electrical contact with said outer sheath and the insulated conductors of the second type adapted to be coupled to the insulated conductors from the second type of sensor.

10. The cable of claim 9, wherein the conductors of the first type are arranged in a twisted manner so as to have a given twist rate per unit length of said cable, and the conductors of said second type are arranged in a twisted manner so as to have a twist rate per unit length of said cable which is different than said given twist rate.

11. The cable of claim 9, wherein the low noise conductive outer sheath comprises a dielectric material having an outer layer treated so as to promote electrical conductivity.

12. The cable according to claim 11, wherein said outer jacket comprises a carbon-loaded plastic sheet.

13. The cable as defined in claim 12, wherein all of said second type of insulated conductors have an outside diameter which are all the same, and said given distance between said sheaths is substantially equal said outside diameter so as to cause the outer jacket of all said second type of insulated conductors to be in physical contact with both of said inner and outer sheaths.

14. The cable as defined in claim 9, wherein said inner sheath comprises an electrically conductive outer portion, and said given distance between said sheaths is substantially equal to an amount needed to allow the outer jacket of said second type of insulated conductor to be in physical contact with both of said inner and outer sheaths.

15. The cable of claim 9, further including a single layer of a plurality of insulated conductors of a third type adapted to be coupled to insulated conductors from a third type of sensor, said third type of insulated conductors being arranged in a group adjacent one another between said inner and outer sheaths.