"Hissing"

Warren Mays

Description

Title:

"Hissing"

Creator:

Warren Mays

Date:

6/17/2008

Text:

Hello Again,

 

Original question:

 

What have you found to be the most successful way to reduce the hissing
noise associated with an AK lanyard system? Do larger and/or more exhaust
holes in the bottom of the socket make it better or worse?

 

Responses, in order of receipt:

 

-I give my patients with lanyards Ipod Shuffles. Use L5999 and bill for
personal microprocessor controlled socket evacuation noise reduction system,
heavy duty, with rechargeable lithium Ion Batteries, charger not included.

 

-What type of lanyard system are you using?

 

-You may want to create a channel right below the gluteal fold to better
suspend the prosthesis. That way you can reduce the pistoning.

 

-The hissing is the result of pistoning. Prevent the pistoning and you'll
have no more hissing. More or larger holes will exacerbate the problem.

 

-Drill with a 1 hole saw in the posterior/distal aspect of socket.
Problem solved.

 

-If it is an OWW lanyard, make sure you have adequate distal contact so that
the O-ring seals against the lock body.

 

-Try a single ply or a sheath over the liner.

 

-In my experience larger holes make it better ,just be care full that you

don't compromise the stability of the lamination

 

 

 

Thank you to all who responded. I really liked the Ipod idea. Clearly the
easiest solution.

 

Not much consensus on the hole issue. I did like the comment about
pistoning.

 

Another question for you: When you guys are doing lanyard-style sockets, are
you doing ischial bearing or ischial containment? Also, do you feel that
pistoning is a given with lanyard systems?

 

Thank you for your time,

 

 

Warren R Mays, CPO

 

PS: The Hissing Kitty response did not merit posting.

 

 

 


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Citation

Warren Mays, “"Hissing",” Digital Resource Foundation for Orthotics and Prosthetics, accessed November 24, 2024, https://library.drfop.org/items/show/229364.