Transcript Roller PATH: A Patient Transfer and Positioning Aid for Medical

Roller PATH:
A Patient Transfer and Positioning Aid
for Medical Imaging
Team Members
Josh Anders, Leader
Megan Buroker, Communicator
Alyssa Walsworth, BSAC
Betsy Appel, BWIG
Prof. Mitch Tyler
Client
Dr. John D. Enderle
Department of Biomedical Engineering
University of Connecticut
BME 402 Midsemester Presentation
February 24, 2006
University of Wisconsin - Madison
Biomedical Engineering Design Courses
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this information. In addition, any information provided herein may include
results sponsored by and provided to a member company of the Biomedical
Engineering Student Design Consortium (SDC).
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1) Agrees to use this information solely for purposes related to this review;
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4) Continued attendance at this presentation constitutes compliance with this
agreement.
Overview
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Problem Statement
Chosen Design Alternative
Constructed Prototype (completed Fall ’05)
Preliminary Validation
Design Additions
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Wheel Lock
Track Lock
Patient Immobilizers
Technician Handles
Safety Labels
• Testing Protocols
– Ergonomics and Patient Safety
– Mechanical Stress and Material Strength
– Imaging Environment Compatibility
• Final Design Deliverables
Problem Statement
• Patient positioning
limitations onto and within
medical imaging devices,
which may include the
initial patient transfer
and/or maintaining static
positioning during data
acquisition and
measurement, have
rendered many
individuals with
disabilities unable to
benefit from imaging
technologies.
LightSpeed VCT
1.5T MR
PET/CT Hybrid
gehealthcare.com
Chosen Design Alternative:
Roller PATH
• PATH – Patient Aid Transfer Help
• Three piece design
– Transfer bed
– Imaging track
– Hospital bed track
• Transfer bed
– Two columns of wheels
– Rolls from track to track by aligning stretcher and
imaging bed
• Static aid incorporated into mattress
• Wheel and track locks included for patient safety
Chosen Design Alternative (cont.)
Constructed Prototype
• Final Dimensions
– Research Statistical Means
– 74 ¼” x 22” x 3 ¼”
• Materials
– HDPE frame
– Nylon screws, wheels, and
axels
– Vinyl mattress pad cover
– Foam padding
• Construction completed
by team and Midland
Plastics
• Total Expenses: $850.60
Preliminary Validation
• Imaging Validation
– Rationale: verify that
materials cause no
significant artifact
– Result: no noticeable
artifact in CT environment
(displayed on ensuing
slide)
• Patient Transfer
Validation
– Rationale: verify a safe
and comfortable transfer
– Result: safe and
comfortable transfer of
team member
Design Additions
• Wheel Locks
– Groove allows small
HPDE piece to slide in
on both sides of the
wheel
• Track Locks
– HDPE piece spans the
track joint
– Plate screwed in on
either side of track
Design Additions (cont.)
• Patient Immobilizers
– Neck foam for adult,
pediatric and neonatal from
Contour Fabricators Inc.
Medical Solutions
– Nylon strap and release
buckle for immobilizing
arms and legs
• Two straps on each limb
• From REI
– Industrial strength Velcro®
from Ace Hardware
Design Additions (cont.)
• Technician Handles
– Molded plastic
– Metallic components
removed through
drilling
• Safety Labels
Testing Protocols
• Mechanical Stress and Material Strength
– Goal: Ensure material can withstand maximum weight
– Expected Results: Properties are consistent under
loading
• Ergonomics and Patient Safety
– Goal: Test the overall ease and comfort of the transfer
– Expected Results: Successful, safe transfer
• Imaging Environment Compatibility
– Goal: Quantify artifact in all modalities
– Expected Results: Resulting images appropriate for
radiological analysis
Mechanical Stress and Material
Strength
• Place weights on bed, distributed
according to anthropometric table
– Maximum load failure analysis: deflection
taken at maximum load
– Hysteresis: deflection measurements
compared between loading and unloading
– Creep: weights left on table for two minutes,
measure change in deflection over time
Ergonomics and Patient Safety
• Protocol
– Recruit test patients
– Informed consent required
– Remove wheel locks and transfer patient from
hospital bed track to imaging bed track and
back
– Measure force required to complete transfer
– Ask patient and technician to rate comfort and
safety
Imaging Environment Compatibility
• Testing done in X-ray, CT, MR and PET
imaging environments to quantify artifacts
– Test in each environment with and without the
table
– Testing done with phantoms
– Quantitatively evaluate scans based on SNR
and compare scans
– Have radiologist determine quality of scan
Final Design Deliverable and
Future Work
• Conduct validation testing
• Outreach
– Madison West High School
– Senior course in Healthcare Professions
• Journal Article
• Patent submission to WARF
• National Design Competition
– Final paper
– Video of construction, validation, and patient trials accompanied
with audio support
– Webpage
• Final Considerations for Marketability
References
Computed Tomography. GE Healthcare.
http://www.gehealthcare.com/usen/ct/index.html. 2004.
Contour Fabricators Inc. Medical Solutions.
www.cfimedical.com/. 2006.
CSP Medical. www.cspmedicalstore.com. 2005.
Student Design Competition. RERC on AMI.
http://www.rerc-ami.org/ami/projects/d/2/2/year3/. 2005.
Webster, John (ed). Bioinstrumentation. John Wiley &
Sons, Inc. USA: 2004.
Questions?