hi, this is a device which outperforms tightrope, and has no patent issues.
this is the video of the knot and how it works.
slippage of 0.16 mm after 1000 plus cycles. Tightrope slips about 2 mm as per their study.
Load to failure is 866 N after 2000 cycles , (at which the knot breaks) . Tightrope breaks at 876.
It easily outperforms tightrope both in graft protection and locking security.
Simple to make .
No patent infringement.
Here's the YouTube link.