iBOT wheelchair cabling?

Hi

I was watching the iBOT wheelchair climbing stairs, and I can’t help but notice how the cables to/from the wheel motors could get twisted. The two wheels are on an arm rotated by a shaft, which is connected to the wheelchair body. I presume all cables are fed through around the shaft. But because the wheel arm rotates (infinitely), wouldn’t the cables get twisted? How could the cables be fed through without getting twisted?

submitted by /u/andymcd_
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