,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Auto-suture device for nasal surgery,Client:Dr.Benjamin Marcus,Department of Otolaryngology,Advisor:Professor Tyler,Mark YarmarkovichLeader,Joseph CabelkaCommunicator,Jennifer WagerBSAC,Therese RollmannBWIG,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,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,Background:Nose,Septum:cartilage dividing nose into two chambers;3-5 mm wide,Cartilage Youngs Modulus=10MPa,Mucous membrane lining each side of septum,Nostril width:10mm-15mm,Flexible,Background:Septoplasty,Deviated septum,Septum is severely shifted from midline,Causes difficulty breathing,sleeping,Background:Septoplasty,Incision made to expose caudal end of septum,Cartilage excised to prevent overriding,Cartilage swung into alignment,Background:Suture,Sutures,Close incision,Strong,non-toxic polymer fiber,Absorbable,Purse-string suture pattern,Continuous,Circular,Inverting,Current Device,Autosuture devices currently available for bowel surgery,Large scale,Endostitch,Automatic Needle Passer,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/cm,3,7.75 g/cm,3,1.32 g/cm,3,Working Temperature,450,C,400,C,249,C,Design I:Mechanical Needle Passer,Needle passed with pulley system,Locked into place by notched edges,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,Design II:Clamp,Clamped on either side of the septum,Suture is manually inserted through raised septum,Design II,Pros,Easy to manufacture,Can be disposable,Safe,Cons,Not adjustable to size of nose,Not automatic,Design III:Magnetic Needle Passer,Magnetic field generated by coils secures needle,Switch controls magnetic field activation,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,Design Matrix,Design I,Design II,Design III,Suturing 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,Future Work,Discuss design options with client,Build prototype,Test device for suture time and ease of use,References,Autosuture.29 January 2007.,Azom.6 March.,Cornell.27 February 2007.,Fact Sheet.2 March 2007.,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.,Septoplasty.27 February 2007.,Septum.7 March 2007.,