repiphysis expandable technology “ when mes and mds talk” presented by: jessica m. lopez
TRANSCRIPT
Repiphysis Expandable Technology“When MEs and MDs talk”
Presented By:
Jessica M. Lopez
What is it?
Prosthesis designed for children with cancer who are in danger of amputation
Grows up to three inches without surgery
Expands about 1/8” to 1/2”at a time so it isn’t painful
Designed by French engineer Arnaud Soubeiran
First used in December 2002
How Does It Work?
A spring mechanism is buried in the larger of two polymer sleeves
An electromagnetic field is delivered to an internal antennae, softening the polyetheylene
How Does It Work?
The spring expands. When the electromagnetic field
is removed, the polymer hardens, locking the spring at its new length.
Limb Salvage…
Non invasive after initial surgery No anesthetics needed (saves $) Can be used for various cancers
such as osteosarcoma and Ewing's sarcoma
Reduces the need for amputation
Titanium Alloy
Produced by hot forging 90 wt% Ti, 6 wt% Al, 4 wt% V Allows for better CT and MRI scanning Doesn’t interfere with the body’s chemistry Imitates density of real bone Tensile strength, and fatigue strength match, if not
exceed those of stainless steel More biocompatible
Polyetherether Ketones
Resistance to moisture Satisfactory resistance
to degradation by various environments. Pg 595, Table 17.4 of your text book.
Inherent toughness Does not allow tissue to
scar onto it, easing the pain of elongation.
Reference
ABC13 news http://abclocal.go.com/ktrk/news/63003_health_bonecancer.html
Institute for Limb Preservation http://www.limbpres.com/TechList.asp Jelsoft Enterprises Limited
http://forums.macrumors.com/archive/topic/55820-1.html Mechanical Engineering, Vol.126/No.2 February 2004, ASME, New
York, NY Dr Mike Jenkins www.eng.bham.ac.uk/metallurgy/people/Jenkins_files/
smsEngineeringPolymers.pdf Material Science and Engineering, William D. Callister, Jr.,Von
Hoffman Press, 2003 DynoMed, Inc
http://www.wcortho.com/Patients/oncology/repiphysis.asp