I googled for the phrase and found:

Monitoring downhole production flow in an oil or gas well
WO 2009103971 A2
:
10. The apparatus of claim 8 or claim 9 further comprising a longitudinal electrical connection point spine disposed within the first insulating layer to provide electrical connections to each of the electrical connection points within the sample and reference layers.
http://www.google.com/patents/WO2009103971A2?cl=en

Contrôle d'un écoulement de production de fond de trou dans un puits de pétrole ou de gaz
WO 2009103971 A2
http://www.google.com/patents/WO2009103971A3?cl=fr

One of the “external links”:

(EN) MONITORING DOWNHOLE PRODUCTION FLOW IN AN OIL OR GAS WELL
(FR) CONTRÔLE D'UN ÉCOULEMENT DE PRODUCTION DE FOND DE TROU DANS UN PUITS DE PÉTROLE OU DE GAZ
http://patentscope.wipo.int/search/en/detail.jsf?docId=WO200...
Figure 3 is a cross-section through the tubular portion 44 of the apparatus 20 showing that the tubular portion 44 comprises four layers. The external layer is an electrically-conducting tubular sample layer 22 which is exposed to the radial production flow X in use. The sample layer 22 is electrically insulated from the production tubing 12 in use. Disposed concentrically within the sample layer is a first electrically-insulating tubular layer 24. Then, concentrically within the first insulating layer 24, there is an electrically-conducting tubular reference layer 26. The reference layer 26 is similar to the sample layer 22 in material construction, but the reference layer 26 is protected from exposure to the radial production flow X in use. Finally, there is a second electrically- insulating tubular layer 28 disposed concentrically within the reference layer 26. As shown in Figure 2, there are perforations 30 formed in all four layers of the tubular portion 44 to allow for the radial production flow X through the apparatus 20 in use.
The apparatus 20 includes two longitudinal spines 36 and 37. One spine 36 contains wiring and cables to provide power and communications to the apparatus 20. In particular, the power and communications spine 36 is used to convey downhole sensor measurements to the surface (the downhole sensors of the apparatus 20 will be described in more detail below) . The other spine 37 provides pairs of electrical connection points at longitudinal intervals along the tubular portion 44. The function of the electrical connection points is discussed further below.
In Figures 2 and 3, the spines 36 and 37 are both disposed within the first insulating layer 24. Alternative arrangements are also envisaged. For example, one or both of the spines 36 and 37 may be disposed in the outer casing 16. However, it is advantageous to provide the electrical connection point spine 37 within the first insulating layer 24 so as to provide easy access to both the sample layer 22 and the reference layer 26. It will be understood that it is not essential to provide the spines 36 and 37 directly adjacent to one another, as shown in Figures 2 and 3. …

This page shows some details.
http://patentscope.wipo.int/search/en/detail.jsf?noMenu=fals...

Fig. 2 is clearly visible under http://patentscope.wipo.int/search/docservice_fpimage/WOGB20...
and shows items 36/37 between the tube shells 24/26.

All figures can been seen under http://www.google.com/patents/US20100326654?cl=en clearly. Enlarge by clicking.

I cite: “One spine 36 contains wiring and cables”. Conclusion: The spine is no cable, but more like a tube or sleeve. It’s not described in detail, especially no indication of material and shape (round, oval or flat).