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.

Problem Statement Current tissue retractors are narrow, multiple

retractors are required especially in obese patientsNY 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 productionPrototype could not be used in surgery

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

Conflict Map

Adaptor Design Requirements Must fit multiple patient sizes and

provide a clear view of the surgical site Must be cost efficient Must function adequately in the surgical

procedure Be able to be sterilized Strong enough to hold back fat tissue

Ideal Device

Easy to use Small size Simple design- easy to

manufacture Lightweight Biocompatible

Primary Objectives Design a modular adaptor for retractors that:

Keeps back adipose tissue

Is easily used by surgeon Attachment technique

Is simple to manufacture Use cheap material & Production method

Is ready for use in surgery Easily sterilized One time use

Preliminary Design 1 Wing-like structure

≈ 5 inches 10 inch single incision

Attachment mechanism:Hook and slotTapering method1-1.5 in. wide

Form by bending metal Non-disposable Stainless steel

Design 2

Disposable Plastic material Attaches to retractor Multiple sizes Requires holding

Design 3

Similar to cheek retractor

Plastic material Disposable Hands-free

Goals

Reduce total hip replacement surgery costLess personnel in the operating roomLess retractors needed for surgery

Increase vision and work room for the surgeonIncrease efficiency of the surgeryReduce surgery time

Performance Metrics

Retractor system work on 95% of patientsDifferent size attachments for non-disposable

and disposable design Costs

Keep production costs minimal○ Mass production○ Readily machined

Predicted to be ~$300 for retractor and attachments (non-disposable)

Disposable: $1-$10 per device

System and Environment Role in surgery

Increase view of region and allows access Why its beneficial to the surgeon

Reduce people near patientReduce number of retractorsMake surgery easier

Testing Methods

Verification Validation Hardware Testing Stress Testing

Pro/E Mechanical Analysis Safety Testing

Next Steps…

Visit Surgery Feb. 2

Design Sketches

3 Pro/E Design Options

Final Pro/E Design

Prototype Completed

Complete Testing/Surgery Use

Presentation

6/218/109/2911/181/72/264/176/6

Start Date

Completed

Remaining

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