Retractor for Breast Surgery

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Retractor for Breast Surgery
Clients Dr. Piasecki Plastic Surgery UW
Hospital Dr. Gutowski Plastic Surgery UW
Hospital Advisor Prof. Murphy Biomedical
Engineering Department UW-Madison

• Christopher Westphal Leader
• Sarajane Stevens Communicator
• Arinne Lyman BSAC
• Eric Bader BWIG

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Overview

• Problem Statement
• Design Constraints
• Background
• Procedure
• Current Device
• Light/Suction
• Designs
• Future Work

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Problem Statement

• Our goal is to develop a breast retractor that
  will allow the doctor to create a cavity in the
  breast through a small inframammary incision.
  The retractor must be self-standing, contain a
  light source that emits light in all directions,
  and create suction in various places of the
  breast cavity.

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Design Constraints

• Self-standing
• Proper light and suction distribution
• Fit through a 3-4 cm incision
• Sustain a maximum force of 60 lb
• Non-porous material
• Withstand autoclaving temps (121C)

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Background Procedure

• 3 cm incision
• Retractor holds tissue up
• Form cavity with electrocautery tool
• Implant placed above or below pectoralis
• Closed with dissolvable sutures

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Current Device

• ASSI Breast Retractors
• Fiber optic light source
• Suction source
• C or L shape
• Neon Breast Retractor
• Light reflective polymers
• Distributed light
• Lightweight
• Insulated
• One-time use

http//www.accuratesurgical.com/accuratesurgical/D
ocs/breast_instrumentation/retractors/stanger.asp
http//www.sheffmed.com/neonret.htm
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Background Light/Suction

• Light Sources
• Fiber optics
• Light reflective polymers
• LightMat

• Suction Sources
• Standard hospital wall mount
• 20-120 mmHg

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Design 1 The Raisin

• Squeeze handle
• Actuates ratchet mechanism
• Quick release

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Design 1 The Raisin

• Pros
• Wide base
• Easily adjusted
• Minimally obstructed field of view

• Cons
• No pivot
• Bulky handle
• Difficult to clean

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Design 2 The Spreader

• Twist knob
• Pivot point at base
• Large angle spread

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Design 2 The Spreader

• Pros
• Dog-legged for minimal obstruction
• Light-weight
• Pivot creates taller cavity

• Cons
• Hard to adjust
• May exert pressure on patient
• Non-discrete step increments

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Design 3 The Jack

• Pull top bar back
• Lift up
• Slide forward

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Design 3 The Jack

• Pros
• Used with various procedures
• Simple design
• Easy to manufacture/clean

• Cons
• Instability
• No pivot point
• Obstructs field of view

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Design Matrix
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Future Work

• Determine method of construction
• Create prototype
• Test for sufficient force, light, and suction
  distribution
• Revise design if needed

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References

• http//medevoice.co.uk/sheffmed/January05.php
• http//www.accuratesurgical.com/accuratesurgical/D
  ocs/breast_instrumentation/retractors/stanger.asp
• http//rejuven8u.com/plasticsurgery/breast_augment
  ation_surgery_info.html
• http//www.lumitex.com/medical.html
• http//www.buyemp.com/product/1012001.html

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Questions