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Group 10:Azni Wahid
Naziha LazimZul Zolkafly
Mohamed OsmanHassan Atassi
Dave Martinez VP Sales Zimmer Mechanical Engineer
Dr. Michael Christie
Orthopedic Surgeon-Southern Joint Replacement Institute
Holds Design Patents
Surgical instrument by which a surgeon can:• actively separate the edges of a surgical
incision or wound• hold back underlying organs and tissues
Allows for:• Smaller incision• Greater working area
Available in many shapes/sizes
Wide Variety of retractors available for hip surgery• Choice depends surgeons training/ patient
Size of Patient Point in time in surgery
Retractors are made of surgical stainless steel
Average Duration of Hold: 15.5 Minutes
Forces:• Maximum: 48.8N• Average: 9N
Retractor Cost
Aufranc Cobra Retractor $314
Ischium Retractor $825
Sofield Retractor $360
Femoral Elevator $975
Hohmann Retractor $422
Richardson Retractor $485
Hibbs Retractor $300
Average Cost Per Set $4,820
To service 10 hip surgeries per day a minimum of 8 sets needed.
Total cost: $38,560
Model Overall Length
Handle Length
Blade Depth
Blade Width
Standard 8.75” 8” 3” 1.5”
Medium 10.75” 9.75” 4.5” 1.5”
Extra Large
14.25” 13” 6.5” 1.5”
1. Multiple versions of same retractor needed to do the same job because of varying patient size
1. Increase cost2. Increase Storage space
2. Limited Size Permutations: never exact fit to patient size
1. Decreased surgeon field of view (too large)2. Ineffective & causes injury (too small)
3. Obese Patients1. Adipose tissue wraps around retractor inefficiencies2. Hip retractors being used in knee surgery
4. Uncomfortable Handle1. Average user changes hand positions every 71 seconds2. Results in abrupt movement of retractor blade
increases chance for injury & length of recovery
Characteristics• Alterable Handle length & Blade Depth• Interchangeable handle types and blades• Ergonomic Handle• Adipose blade accessory
We propose a mechanism in order to alter the handle length and blade depth to any potential need• Current Standards averages three version of a
given retractor of various dimension• Our solution allows for much more
Customizable to exact patient dimension Optimized surgical view Ideal length to retract exact amount of tissue
• 3 retractors 1 Less number of tools Potential Cost decrease
New handle design to optimize comfort• Potential for multiple handles to be
designed in future based on user preferences
Various types of tips are used based on need of surgery & surgeon preference• Various tips can be manufactured
Surgical Staff (retractor user) have different perceptions of comfort• Various Handles Can be Manufactured
Example: • 5 tips + 5 handles= 25 retractors
Separating the two components allows for 10 components instead of 25
31% of Americans are classified as ‘obese’
Obesity rising by 2% per year 3-4 fold increase of obese patients
requiring Hip replacement Proposed Solution:
• An additional accessory to be added to retractor when operating on obese tissue to handle the increase of adipose tissue
Proof of concept designed modeled with:• Interchangeable & adjustable tip• Interchangeable & adjustable handle• Adipose Accessory
Additional tips and handles can be designed in future
Alterable Handle length & Blade Depth
Detachable adipose blade
HANDLE
BLADE
ADIPOSE BLADE
Unlock
Lock HANDLE
BLADE
BODY
1)
2)
3)
4)BladeBody
Slot/groove
Minor tweaks to locking mechanism Determine Dimensions
• Stress-Strain Analyss Protoype