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Adaptable Retractor for Total Hip Replacement Surgery - PowerPoint PPT Presentation


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Trey DeLong Lacey Gorochow Brian Rappa Adam Vandergriff Sandra Wadeer Advisor: Dave Martinez VP of Sales at Zimmer, Inc. Surgical Consult: Dr. Michael Christie, M.D. Southern Joint Replacement Institute. Adaptable Retractor for Total Hip Replacement Surgery. Problem Statement.

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adaptable retractor for total hip replacement surgery

Trey DeLong

Lacey Gorochow

Brian Rappa

Adam Vandergriff

Sandra Wadeer

Advisor: Dave Martinez

VP of Sales at Zimmer, Inc.

Surgical Consult:

Dr. Michael Christie, M.D.

Southern Joint Replacement Institute

Adaptable Retractor for Total Hip Replacement Surgery

problem statement
Problem Statement
  • Current tissue retractors are narrow, multiple retractors are required especially in obese patients
    • NY times reports 34% adults are obese
    • +Surgical Techs($20.00/hr*2-4hr/surgery*200k surgeries/year)
    • Time of surgery increases as well
  • Previous team designed an adjustable retractor
    • Complex and impractical for industrial

production

    • Prototype could not be used in

surgery

mechanism consequences
Mechanism & Consequences
  • Mechanism causing the problem

Physical properties of adipose tissue allow it to wrap around narrow retractors

  • Consequences of unresolved problem

Poor surgical field of vision

Increase cost for additional materials and personnel

surgery experience
Surgery Experience

4-5 in (6 in in bigger patient)

Depth can range from 1-6 inches depending (Patient Size)

3 in wide

Fat tissue getting in the way

dr christie s perspective
Dr. Christie’s Perspective
  • Functions of retractor:
    • Orient the incision
    • Keep tissue from falling into surgical window
  • Disposabile vs. Non
    • Not “green”
    • Strength concerns
  • Ideal Device:
    • Robust
    • Simple
    • Movable window
design requirements objectives
Design Requirements & Objectives
  • Keep back adipose tissue
  • Fit multiple patient sizes and provide a clear view of the surgical site
  • Must be cost efficient
    • Simple manufacturing
    • cheap material
  • Ready for use in surgery
    • Easily attached
    • Easily sterilized
  • Strong enough to hold back fat tissue
design
Design
  • Lofted feature-rounded to keep back tissue
  • Curvature based on angle of known measurements in surgery video
material of attachment piece
Material of Attachment Piece
  • 17-4 Precipitation Hardening Stainless Steel
    • Composition: 15.5% Chromium, 4.5% Nickel, 3.5%Copper
    • Ultimate Tensile Strength: 1000-1340 Mpa
    • High strength maintained up to 600°F
    • Corrosion resistance superior
    • Readily welded-preheating not usually required
stainless steel model
Stainless Steel Model
  • Weld rods onto existing retractor to provide rails
  • Attachment made in machine shop using CAD design
goals
Goals
  • Reduce total hip replacement surgery cost
    • Less personnel in the operating room
    • Less retractors needed for surgery
  • Increase vision and work room for the surgeon
    • Increase efficiency of the surgery
    • Reduce surgery time
performance metrics
Performance Metrics
  • Retractor system work on 95% of patients
    • Different size attachments for non-disposable.
  • Costs
    • Keep production costs minimal
      • Mass production
      • Readily machined
    • Predicted to be ~$300 for retractor and attachments (non-disposable)
system and environment
System and Environment
  • Role in surgery
    • Increase view of region and allows access
  • Why its beneficial to the surgeon
    • Reduce people near patient
    • Reduce number of retractors
    • Make surgery easier
testing methods
Testing Methods
  • Verification and Validation
  • Hardware Testing
  • Stress Testing
  • Sterilization Testing
verification and validation
Verification and Validation
  • Verification: ensuring that all of the parts of the device work together
    • Obtained a model made of ABS plastic made from an FDM process
  • Validation: making sure that the device satisfies specified requirement
    • Taking the actual prototype into surgery for Dr. Christie to use
hardware testing protocol
Hardware Testing Protocol
  • Use of mechanical equipment to test strength of device
    • Take retractor with similar properties to testing labs
    • Apply a load using a compression/ tensile machine to the device
    • Hold the load over the device for several minutes
    • Observe the deformation of the device over time
  • Mechanically test ability of steel to get the properties
stress testing protocol
Stress Testing Protocol
  • Computer Modeling
    • Use PDE Toolbox (MATLAB) to analyze tissue
    • Obtain force load on the retractor from tissue data
    • Model stress on the retractor using force loads
    • Analyze model during normal use
sterilization testing
Sterilization Testing
  • Use in surgery
  • Run through Autoclave to test resilience and observe any remaining tissue
  • Run through multiple cycles and observe the number of cycles until completely clean.
next steps
Next Steps…
  • Obtain a completed prototype to be shown in the final presentation
  • Conduct testing methods
    • Verification
    • Validation
    • Hardware Testing
    • Stress Testing
    • Sterilization Testing
  • Present our final project
references
References
  • http://www.bls.gov/bls/blswage.htm
  • http://www.innomed.net/hip_rets_mis.htm#Anchor-APC-49575
  • http://www.nytimes.com/2010/01/14/health/14obese.html
  • http://www.orthosupersite.com/view.aspx?rid=1889
  • http://www.zimmer.com/z/ctl/op/global/action/1/id/8140/template/PC/navid/10427