FLEX2PLAY An ankle strengthening device with virtual reality interface for children with cerebral palsy Group 21 December 7, 2011 BME 401 Senior Design Mentor: Jack Engsberg, PhD Liz Phillips (Presenter), Kelly Hill, Amanda Meppelink
Jan 10, 2016
FLEX2PLAYAn ankle strengthening device with virtual
reality interface for children with cerebral palsy
Group 21December 7, 2011
BME 401 Senior DesignMentor: Jack Engsberg, PhD
Liz Phillips (Presenter), Kelly Hill, Amanda Meppelink
Outline
Overview Details of Chosen Design Materials and Manufacturing Conclusion
The Need A strength training
device thatis safe for in-home
userequires minimal
setup or user training
is affordableis portablemotivates patient
participation
Overview ○ Details of Chosen Design ○ Materials & Manufacturing ○ Conclusion
The Scope
To design an at-home ankle strengthening device – Flex2Play – that motivates participation by interfacing therapy with a WiiMote which controls online video games
Overview ○ Details of Chosen Design ○ Materials & Manufacturing ○ Conclusion
Design Specifications Full range of motion
30° from neutral in DF -50° from neutral in PF
Progressive Resistance 35 Nm DF torque 101 Nm PF torque Resistance in at least 15%
increments Affordable – $200 target Portable – 30lbs 8 ft3
Virtual Reality Interface 2010 BME401 Group “Wii
Controlled Gaming for Therapy”
20° Dorsiflexion
0° Neutral
–50° Plantarflexion
Plantarflexionτ=F*d*sin(θ)F=101Nm/(0.28m*sin(90))F=361N
Dorsiflexionτ=F*d*sin(θ)F=35Nm/(0.28m*sin(90))F=125N
Overview ○ Details of Chosen Design ○ Materials & Manufacturing ○ Conclusion
Chosen Design: Elastic Bands
Overview ○ Details of Chosen Design ○ Materials & Manufacturing ○ Conclusion
Four Main Components: Footplate Base Hinge Joint Elastic Bands
FootplateOverview ○ Details of Chosen Design ○ Materials & Manufacturing ○ Conclusion
Exploded Isometric View
WiiMote Controller Connection
Overview ○ Details of Chosen Design ○ Materials & Manufacturing ○ Conclusion
Isometric View
Side View
BaseOverview ○ Details of Chosen Design ○ Materials & Manufacturing ○ Conclusion
Isometric View
Overview ○ Details of Chosen Design ○ Materials & Manufacturing ○ Conclusion
Hinge JointOverview ○ Details of Chosen Design ○ Materials & Manufacturing ○ Conclusion
Isometric View
Exploded Front View
Elastic Band Connections
Overview ○ Details of Chosen Design ○ Materials & Manufacturing ○ Conclusion
Elastic Band Connection Calculations
Overview ○ Details of Chosen Design ○ Materials & Manufacturing ○ Conclusion
Manufacturing
Overview ○ Details of Chosen Design ○ Materials & Manufacturing ○ Conclusion
Estimated Flex2Play market size 114,000 children in US age 5-18 with spastic
cerebral palsy
Commercial Production Expected 1,000 units sold in the first year Expected 4,000 units sold in next 5 years
Near Future One Flex2Play prototype for device evaluation 10 devices for evaluation in small sample
MaterialsComponent Products Cost for 1 deviceFootplate footplate (1), side plates (2), washers (4),
screws (4), nuts (4), straps (2)$65.09
Base telescoping post (1), base post (1), pin (1), base plate (1), stabilizing posts (2), rubber, connection hoop, adhesive
$165.70
Hinge hinge plate (1), bushing (4), axle (1), bolt (2), set screw (2), washer (2), Velcro
$83.90
1 device 10 devices
Mass production
Materials Costs $314.66 $156.58 $39.00Manufacturing Costs
$225.00 $225.00 $150.00
Total $539.66 $381.58 $189.00
Overview ○ Details of Chosen Design ○ Materials & Manufacturing ○ Conclusion
ConclusionsOverview ○ Details of Chosen Design ○ Materials & Manufacturing ○ Conclusion
Specification FulfillmentAffordable – $189 mass productionPortable – 8.82 lbs and 2 ft3
Safety Considerations Future directions
Intellectual PropertyPilot Study with 10 devices
ReflectionsWhat we learnedWhat we would do differently
Works Cited Aisen, ML, et al. "Cerebral Palsy: Clinical Care and Neurological
Rehabilitation." Lancet Neurology 10.9 (2011): 844-52. Boley, B. L. (1997). Overview of Motor Types Tutorial. Retrieved October 23,
2011, from http://www.oddparts.com/acsi/motortut.htm Compression Springs. 23 October 2011.
<http://www.leespring.com/int_learn_compression.asp>. Dynetic Systems. (n.d.). Brushless vs Brushed. Retrieved October 23, 2011,
from Dynetic Systems: http://www.dynetic.com/brushless%20vs%20brushed.htm
Pinneger, Gavin J and Andrew G. Cresswell. "Residual force enhancement after lengthening is present during submaximal plantar flexion and dorsiflexion actions in humans." Journal of Applied Physiology (2006): 18-25.
Simple Machine Elements. 23 October 2011. <http://cnx.org/content/m13594/latest/>.
The Hygenic Corporation. (2006). Resistance Band & Tubing Instruction Manual. Akron, OH, USA.
Torsion Springs. 23 October 2011. <http://www.leespring.com/int_learn_torsion.asp>.
FLEX2PLAYAn ankle strengthening device with virtual
reality interface for children with cerebral palsy
October 26, 2011BME 401 Senior Design
Mentor: Jack Engsberg, PhDAmanda Meppelink(Presenter), Kelly Hill, Liz Phillips
Elastic Bands
Overview ○ Details of Chosen Design ○ Materials & Manufacturing ○ Safety○ Conclusion