auto-suture device for nasal surgery client: dr. benjamin marcus department of otolaryngology...
TRANSCRIPT
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Auto-suture device for nasal surgery
Client: Dr. Benjamin MarcusDepartment of OtolaryngologyAdvisor: Professor Tyler
Mark Yarmarkovich~LeaderJoseph Cabelka~CommunicatorJennifer Wager~BSACTherese Rollmann~BWIG
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Problem Statement
Develop device to reduce suturing process in nasal surgery (septoplasty) Reduce OR costs ($60/min)
The device should mimic the procedure currently used by the surgeon
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Design Constraints
Reduce suturing time (less than 10 minutes)
Autoclavable or one-time use Dimensions must conform to the nose Cost up to $300 for disposable, $1500
for multiple use
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Background: Nose
Septum: cartilage dividing nose into two chambers; 3-5 mm wide Cartilage Young’s Modulus=10MPa
Mucous membrane lining each side of septum
Nostril width: 10mm-15mm Flexible
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Background: Septoplasty
Deviated septum Septum is severely
shifted from midline Causes difficulty
breathing, sleeping
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Background: Septoplasty
Incision made to expose caudal end of septum
Cartilage excised to prevent overriding
Cartilage swung into alignment
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Background: Suture Sutures
Close incision Strong, non-toxic polymer
fiber Absorbable
Purse-string suture pattern Continuous Circular Inverting
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Current Device
Autosuture devices currently available for bowel surgery Large scale
Endostitch Automatic Needle Passer
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Materials
Autoclavable or one-time use Light weight and easy to handle Durable if multiple use
Titanium
Composite
Stainless Steel Grade 420
Medical Grade Plastic
(PEEK)
Density 4.42 g/cm3 7.75 g/cm3 1.32 g/cm3
Working Temperature
450°C 400°C 249°C
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Design I: Mechanical Needle Passer
Needle passed with pulley system
Locked into place by notched edges
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Design I: Mechanical Needle Passer
Pros Mimics procedure Manipulated by
surgeon Adjustable number
of sutures
Cons Many small parts
Difficult to manufacture
Difficult to autoclave
Requires dexterity
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Design II: Clamp
Clamped on either side of the septum
Suture is manually inserted through raised septum
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Design II
Pros Easy to
manufacture Can be disposable Safe
Cons Not adjustable to
size of nose Not automatic
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Design III: Magnetic Needle Passer
Magnetic field generated by coils secures needle
Switch controls magnetic field activation
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Design III: Magnetic Needle Passer
Pros Simple mechanism Easy to manipulate Mimics procedure Adjustable number
of sutures
Cons Magnetic field must
generate sufficient force to hold the needle in place
Size
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Design Matrix
Design I Design II Design IIISuturing time (15) 11 8 13
Cost (5) 4 5 4
Manufacturability (5) 1 4 3
Safety (10) 7 9 6
Mimic procedure (10) 8 5 8
Size (5) 4 1 3
Total (50) 35 32 37
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Future Work
Discuss design options with client Build prototype Test device for suture time and ease of
use
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References
Autosuture. 29 January 2007<http://www.autosuture.com>. Azom. 6 March 2007<http://www.azom.com/details.asp?
ArticleID=1141>. Cornell. 27 February
2007<http://www.mae.cornell.edu/PDF/mcv3/JB.36.1069.pdf>. Fact Sheet. 2 March
2007.<http://www.entnet.org/healthinfo/sinus/deviated-septum.cfm>. Kortenbach, Juergen Andrew . “Automatic needle-passer suturing
instrument .” Patent no. 5,814,054. 1998. Lore, John. An Atlas of Head and Neck Surgery. 1988:Philadelphia. Modern Plastics. 6 March
2007<http://www.modernplastics.com/april05/wdtubing.html>. Septoplasty. 27 February
2007<http://emedicine.com/ent/topic128.htm>. Septum. 7 March 2007 <http://z.about.com/d/p/440/e/f/7166.jpg>.