BrainTrust IPPD Final Presentation
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Transcript of BrainTrust IPPD Final Presentation
Image Guided System for Intracranial
Neurosurgery 1
Project Overview
• Problem:– Neurosurgery is complicated, expensive, and not fully
accessible– McKnight Brain Institute developed surgical planning
software that generates a 3D printed mask guide– Mask cannot be sterilized, software is not accessible
• Solution:– Create an easy to use, web based interface for software– Design an articulating arm that can align with position
set by mask and maintain that position after sterilization
2
Software Specifications
• Simple easy to follow user interface• Web Accessible• Ability to upload MRI/CT files• View target and entry point in all three
anatomical planes• Ability to view 3D model of patient head
3
Software Overview• Developed a simple and easy to use web-
based user interface• No cost to develop• Not hardware dependent • Not browser dependent• Functional 3D model from MRI files
4
Hardware Specifications
Mechanical interface for positioning of surgical probe according to target location specified by software-generated mask:– Simple, Easy to use articulating arm
• Pneumatic, passively locking device• Manual manipulation• Minimize size and weight
• Compatible w/ Medtronic articulating arm• 5 degrees of freedom• Maintain sterility: detachable probe head• Maintain accuracy of probe positioning ~2 mm
5
Hardware Design Overview“Dumbbell” design• 5” rigid shaft• Ball joints• Cylinder enclosures
Pneumatic locking mechanism• Passively locks• Air pressure supplied
w/ foot pedal6
Pneumatic Locking Mechanism
• Stacks of washers and wave springs clamp ball
• Silicone tubing inflates to unclamp ball
• Ball freely moves while air pressure is supplied
7
Test Overview
Tests were performed using a phantom to set a target point whose 3D coordinates can be measured in millimeters.1. Locking Mechanism Test
AIM: To assess the accuracy of the pneumatic locking mechanism.
• Unlock arm, line up to target position, lock arm, measure any deviation from target position
2. Loading TestAIM: To determine how much force the arm can withstand while maintaining the set position.
• Applied varying upward loads to see working deflection after locking
• Assessed permanent deflection after force is removed8
Locking Test Results
The average error was found to be:• 1.6±0.43 mm in the
x-direction• 1.15±0.37 mm in the
y-direction• 0.6±0.4 in the z
direction.
Prototype was successful in meeting +/- 2mm accuracy standard.
9
Loading Test Results
10
Technical Performance Measures
11
Cost Analysis
12
• Total cost of prototype fabrication was $754.34
• Substantially cheaper than current system (roughly $1 Million)
• Improved manufacturing and producing in bulk could make a device for less than $100
Recommendations– Hardware
• Improve accuracy and reduce cost through optimized manufacturing
– Software• Allow for multiple trajectories to be set by the surgeon• Connect to server and perform tests
– Testing• Increase sample size• Perform Survey of Surgeons• Test in operating room
– Product• File for patent• FDA 510(k) Acceptance
13
Conclusions• Successful at creating a functional, two part
image-based guidance system– Software has high data capacity, user-friendliness, and
accessibility– Hardware has a working pneumatic locking
mechanism amenable to operating room• System is close to hoped accuracy
– Errors attributed to manufacturing• Prototype is approved by consulted surgeons• Product is much less expensive than the current
standard
14
We would like to thank:• Dr. Scott Banks• Dr. Frank Bova• Dr. Didier Rajon• UF Dept. of
Neurosurgery
15
Irene Freire, CSE Samantha Shuhala, ME Emily Churchwell, BME Celeste Rousseau, BE Medhut Alnadi, BME Matthew Thrush, ME
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