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Modular Retractor for Hip Surgery

Modular Retractor for Hip Surgery. Group 10 : Azni Wahid Naziha Lazim Zul Zolkafly Mohamed Osman Hassan Atassi. Advisors. Dave Martinez VP Sales Zimmer Mechanical Engineer. Dr. Michael Christie Orthopedic Surgeon-Southern Joint Replacement Institute Holds Design Patents.

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Modular Retractor for Hip Surgery

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  1. Modular Retractor for Hip Surgery Group 10:Azni WahidNazihaLazimZulZolkaflyMohamed OsmanHassan Atassi

  2. Advisors Dave Martinez • VP Sales Zimmer • Mechanical Engineer Dr. Michael Christie • Orthopedic Surgeon-Southern Joint Replacement Institute • Holds Design Patents

  3. What is a Retractor? • 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

  4. Retractors-Hip Surgery • Wide Variety of retractors available for hip surgery • Choice depends surgeons training/ patient • Size of Patient • Point in time in surgery

  5. Materials & Forces • Retractors are made of surgical stainless steel • Average Duration of Hold: 15.5 Minutes • Forces: • Maximum: 48.8N • Average: 9N

  6. Retractor Prices To service 10 hip surgeries per day a minimum of 8 sets needed. Total cost: $38,560

  7. Example: Hibbs Retractor

  8. Issues with current retractor system • Multiple versions of same retractor needed to do the same job because of varying patient size • Limited Size Permutations: never exact fit to patient size • Decreased surgeon field of view (too large) • Ineffective & causes injury (too small) • Obese Patients • Adipose tissue wraps around retractor  inefficiencies • Hip retractors being used in knee surgery • Uncomfortable Handle • Average user changes hand positions every 71 seconds • Results in abrupt movement of retractor blade increases chance for injury & length of recovery

  9. Solution: Modular Retractor • Characteristics • Alterable Handle length & Blade Depth • Interchangeable handle types and blades • Ergonomic Handle • Adipose blade accessory

  10. Alterable Handle length & Blade Depth • 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

  11. Ergonomic Handle • New handle design to optimize comfort • Potential for multiple handles to be designed in future based on user preferences

  12. Interchangeable Handle types and tips • 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

  13. Adipose Accesory • 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

  14. Putting it all together… • Proof of concept designed modeled with: • Interchangeable & adjustable tip • Interchangeable & adjustable handle • Adipose Accessory • Additional tips and handles can be designed in future

  15. Modular Retractor – Hibbs retractor ADIPOSE BLADE (detachable) HANDLE (alterable length) MINI INDEXING PLUNGER (locking mechanism) BLADE (alterable length)

  16. Detachable adipose blade: The mechanism Adipose Blade Adipose blade inserted into the spacing Spacing on the retractor

  17. Mini Indexing Plunger: The locking mechanism 8XRM5 M8 X 0.75 GN822.1-4 STEEL MINI INDEX from J.W. Winco, Inc. BODY Source: http://www.jwwinco.com/products/section10/gn822.1/index.html

  18. Future Work Formalize design for manufacturing Prototype

  19. References http://issuu.com/geister/docs/cardio_ribspreaders http://catalog.zimmer.com/content/zpc/products/100.html http://www.freshpatents.com/-dt20090910ptan20090227845.php http://www.boltdepot.com/Catalog.aspx http://www5.aaos.org/oko/sponsors/sno/advSurgicalSimplicity.pdf http://www.freshpatents.com/-dt20090910ptan20090227845.php

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