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Modular Retractor for Hip Replacement Surgery
Hassan Atassi (BME), Azni Nabela Wahid (ME), Mohamed Osman (BME), Noor Naziha Mohd Lazim (BME/EE), Mohammad Zulfadhli Zolkaffly (EE)
Department of Biomedical Engineering, Department of Electrical Engineering, Department of Mechanical Engineering, Vanderbilt University
Sponsor: Dave Martinez, Dr. Michael Christie
Problem Statement
Design a Modular Retractor to remove inefficiencies in the current
retractor instrument in order to decrease the number of
instruments needed in in hip replacement surgery as well as to
make hip surgery more efficient and safer.
Background
Purpose
Device Design
STANDARD HIBBS
Create a proof of concept modular retractor (Hibbs) that
incorporates:
• Alterable handle length & blade depth
• Interchangeable handle types and tips
• Ergonomic handle
• Adipose tissue accessory
Model
Handle Length
Blade Depth
Blade Width
Standard
8”
3”
1.5”
Medium
9.75”
4.5”
1.5”
Extra Large
13”
6.5”
1.5”
MODULAR RETRACTOR
Modular Retractor
Handle Length
Blade Depth
Blade Width
7.68”
4.67”
1.53”
8.49”
5.26”
9.3”
5.85”
10.11”
6.44”
10.92”
HIP REPLACEMENT SURGERY
Every year approximately 300,000 hip replacement surgeries occur
in the United States. This number is expected to grow to 600,000
by 2015.
11.73”
SURGICAL RETRACTOR
• Used to Actively separates the edges of a surgical incision or
wound to create a larger working area for the surgeon and limit
incision size.
• Available in variety of sizes and shapes: Choice depends
surgeons training/ patient
Safety & Costs
Safety Concerns
• Protruding plunger could damage tissue
• Small potential for components to unintentionally dislodge
Cost
PROBLEMS
• Multiple versions of the same retractor needed to do the same
job because of varying patient size.
Plunger Locking Mechanism (JW Winco)
Adipose Accessory Attachment Mechanism
• Limited Size Permutations: never exact fit to patient size.
• Decreased surgeon field of view (too large)
• Ineffective & causes injury (too small)
Labor: 𝟔 𝒎𝒐𝒏𝒕𝒉𝒔 ×
Prototype = $860 (Quick Parts)
Plunger= $29.76 (JW Winco)
Total Cost: 11,689.76
× 𝟓 𝒆𝒏𝒈𝒊𝒏𝒆𝒆𝒓𝒔 = $𝟏𝟎, 𝟖𝟎𝟎
Acknowledgement
• Adipose tissue wraps around retractor making it inefficient.
• Handle is uncomfortable to grasp during long surgery.
• Average user changes hand position every 71 seconds
𝒘𝒌𝒔
𝟔𝒉𝒓𝒔
$𝟏𝟓
𝟒
×
×
𝒎𝒐
𝒘𝒌
𝒉𝒓
Detachable Adipose Accessory
TOP: Longest , BOTTOM: Shortest
We would like to thank Dave Martinez, Dr. Michael Christie, Dr.
Paul King, Dr. Joel Barnett, & St. Thomas Hospital for their
support in the completion of this project.