Support Device for the iSCAN
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Support Device for the iSCAN Anna DiRienzo Katelyn Lesk Amber Loree Jude Menie Daniel McChesney, MD April 13, 2007. Outline. Background Methods/Materials Conceptual designs Testing Methods Results Discussion Future Directions. Background on ICP measurement. ICP (intracranial pressure)

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Outline

Support Device for the iSCANAnna DiRienzoKatelyn LeskAmber LoreeJude MenieDaniel McChesney, MDApril 13, 2007


Outline

Outline

  • Background

  • Methods/Materials

    • Conceptual designs

  • Testing Methods

  • Results

  • Discussion

  • Future Directions


Background on icp measurement

Background on ICP measurement

  • ICP (intracranial pressure)

    • Key indicator for various neurological diseases and trauma

    • Traditional measurements

    • Noninvasive measurements


Background of the iscan

Background of the iSCAN

  • Function

    • Applies pressure to the exterior of the eye

    • Images the central retinal vein (CRV)

    • Relates changes in the CRV to intraocular pressure

  • Necessity

  • Other uses

  • Regulation: Class II device; de novo – 510(k)


Background cont

Background cont.

  • Parts: Lens, means to monitor applied pressure, visualization screen, control pad

  • Advantages: Noninvasive, single handheld unit

  • Disadvantages: Sterilization, difficult positioning, hard to stabilize, high risk of patient injury


Necessity of support system

Necessity of Support System

  • Increases stability of iSCAN and ease of use in an emergency room setting

  • Prevents excessive applied pressure

  • Reduces risk of iSCAN dropping onto patient


Client requirements

Client Requirements

  • Support a weight analog of the iSCAN (approx. 4 pounds)

  • Mobile

  • Sterilizable

  • Compact and easy to store

  • Stable within its expected range of motion

  • Large and small adjustment


Initial designs

iSCAN

Initial Designs

  • Design 1: Pivoting support system


Initial designs cont

iSCAN

Initial Designs cont.

  • Design 2: Over the hospital bed iSCAN support


Initial designs cont1

Initial Designs cont.

  • Design 3: Hospital cart as base of the support system


Current prototype

Current Prototype

  • Conceptual design

    • IV pole

    • Universal clamp with IV handle attachment

    • 90 degree L-plate

    • Flexible gooseneck


Methods of testing

Methods of Testing

  • Stabilization

  • Sterilization

  • Strength

  • Positioning


Stabilization

Stabilization

  • Pressure was applied to places that will most commonly come into contact with unintended forces

    • Gooseneck and IV pole

  • Times were recorded until the area of the attachment to the end of the gooseneck stopped vibrating

    • Four trials for four different people


Results stabilization

Results: Stabilization

  • Average vibration time with 5 lb load:

    • Striking gooseneck: 2.1 seconds

    • Striking IV pole: 2.1 seconds

  • Average vibration time without 5 lb load:

    • Striking gooseneck: 3.6 seconds

    • Striking IV pole: 3.3 seconds


Sterilization

Sterilization

  • EtOH was applied to each novel surface of the support system once a day for one week


Results sterilization

Results: Sterilization

  • Visually inspected everyday for one week with EtOH

    • No deterioration observed


Strength

Strength

  • Added weights in 2.5 lbs increments until unstable

  • Each weight increment was held stable for 5 minutes

  • Failure in this test was defined as instability at a time less than 5 minutes


Strength cont

Strength cont.

  • Two positions were tested:

Maximum

Normal


Results strength

Results: Strength

  • Normal position

    • A weight of 7.5 lbs was held for 5 minutes

    • No additional weight was tested

  • Maximum position

    • A weight of 2.5 lbs was held for 5 minutes

    • A weight of 5 lbs was tested but was taken off after instability was observed (1.5 inch drop in gooseneck position)


Positioning

Positioning

  • Range of motion was determined in the following directions:

    • Lateral

    • Vertical

    • Distance from IV Pole

      • Normal vs. Maximum gooseneck


Results positioning

Results: Positioning

  • Lateral

    • 16.5 inch range if base is immobilized

  • Vertical

    • Maximum height of 55 inches

  • Distance from IV Pole

    • Normal gooseneck - 19.5 inches

    • Maximum gooseneck - 22 inches


Milestones

Milestones

Sept

Oct

Nov

Dec

Jan

Feb

Mar

Apr

Project Ideas

Conceptual Designs

#2

#1

#3

Parts Ordered

Prototype Building

Prototype Redesign

Parts Ordered

Testing

All parts of this project were contributed to equally by all members of this group


Discussion

Discussion

  • Supported more than twice the weight analog of the redesigned iSCAN

  • Mobile, accomplished by six swivel wheels on IV pole base

  • Sterilizable - using EtOH

  • Compact and easy to store

  • Mechanically stable within its expected range of motion

  • Large adjustment


Future direction

Future Direction

  • Vertical Tracking System

  • Locking Wheels

  • Animal Testing


Acknowledgments

Acknowledgments

  • Neurolife - Noninvasive Neurosurgical Solutions

    • Daniel McChesney, MD

  • Optomation

    • Nobuhiko “Poohsan” Tamura, Ph.D

  • Financial Support

    • Drs. Hal Wrigley and Linda Baker

    • Department of Bioengineering


Thank you

Thank You!!!


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