Author Topic: Knot tying for Suture applications (advice!)  (Read 1561 times)

Colby

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Knot tying for Suture applications (advice!)
« on: August 28, 2020, 03:21:11 AM »
Hello all!

I am a biomedical engineering working on designing medical implants and thought i could learn a thing or two about knots from you guys.

I am working in a project where we are trying to make a self cinching knot (suture strand #1) that you can pass a strand of suture (suture strand #2) through that will prevent Suture strand #2 from moving in one direction.

Does a knot that has this function exist?

Thank you!

roo

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Re: Knot tying for Suture applications (advice!)
« Reply #1 on: August 28, 2020, 04:46:00 AM »
Hello all!

I am a biomedical engineering working on designing medical implants and thought i could learn a thing or two about knots from you guys.

I am working in a project where we are trying to make a self cinching knot (suture strand #1) that you can pass a strand of suture (suture strand #2) through that will prevent Suture strand #2 from moving in one direction.

Does a knot that has this function exist?

Thank you!
The precise details of what you ask would be quite difficult in many slick sutures.  There may be related threads that accomplish a similar concept even if the method deviates from your scenario:

https://igkt.net/sm/index.php?topic=3659.msg21131#msg21131
https://igkt.net/sm/index.php?topic=4856.msg31657#msg31657

It may be helpful to study knots that have various sorts of self-locking mechanisms, even if many of them may not work in slick suture material:

http://notableknotindex.webs.com/slippery8.html
http://notableknotindex.webs.com/Versatackle.html
http://notableknotindex.webs.com/blakeshitch.html
« Last Edit: August 28, 2020, 04:50:17 AM by roo »
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Dan_Lehman

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Re: Knot tying for Suture applications (advice!)
« Reply #2 on: August 28, 2020, 10:23:35 PM »
... we are trying to make a self-cinching knot (suture strand #1)
that you can pass a strand of suture (suture strand #2) through
that will prevent Suture strand #2 from moving in one direction.

Does a knot that has this function exist?
It will help to have some graphic of the problem
(says the guy always describing knots verbally!).

"moving in one direction" :: but able to move in the
opposite direction?  One can think of knots that might
see a strand pass through them and then the knot
gets drawn tight to lock that strand in place --it
the moves not at all, though (any direction).

--dl*
====

Isleofgough

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Re: Knot tying for Suture applications (advice!)
« Reply #3 on: September 01, 2020, 04:03:46 PM »
A knot that acts like a zip tie doesn't actually exist, but there are a few that work in surgical applications where the splaying of the loop as it comes down changes the configuration into one that resists back slipping. The most commonly used such knot is the Meltzer knot. However, most surgeons used a pre-tied loop like the Ethicon Endoloop: https://patents.google.com/patent/EP0477020A1/en
Recently, much of the bioengineering studies have focused on changing the suture itself to have small barbs to be self locking.