Pelvic Osteolysis: Evacuation and FillingPlan of ActionWhat is the Problem?Project DescriptionDeliverablesInitial ConstraintsImplicationsSlide 8Initial Proposed DatesProgress by CheckpointCurrent StatusRelevant PapersSlide 13ConsiderationsAdditional Considerations after TestingSetting and Shaping Superelastic SMAEffects of Rotational MovementCyclic Strain vs FractureMechanical TestingCurrent Choices of Angulation in Testing and ConsiderationsSlide 21ParametersData (10 trials + highest and lowest trial)Design ChangesNew Contacts MadeDependencies BeforeDependencies Now5.26.01 Potential/Projected DeliverablesConclusionSignificanceRetrospectiveSpecial Thanks to: Niccole Herbert Mark KuntzPelvic Osteolysis: Evacuation and FillingFelicia ShayComputer Integrated Surgery IICheckpoint PresentationPlan of Action•Project Description•Project Management•Considerations•Data•Contacts•Conclusions•Lessons LearnedWhat is the Problem? •How does the problem arise?–Location–Necrosed bone•Current Situation/Technology•Importance of Project•Project/GoalProject DescriptionProject Description•ID material/potential•Plan for tool design•Explore Options•Evaluate•Build tools•TestingProject DescriptionDeliverablesMinimal:•Research and documentation of potential material–Tools–Filling•Potential tool design with evaluations and considerations•Bone filler material and analysis of potential materialExpected:•Prototyping of instrument and filling•Modeling and evaluation of each•Potential integration and mechanism for whisking, evacuation and fillingMaximal:•Integration with robotProject DescriptionInitial Constraints•Physiologically•Problem •In the material:–Biocompatibility–Flexibility to access the material•In the shape of lesion•In the design and tools needed:–Need for suction and irrigation–FeasibilityProject DescriptionImplications•Minimally invasive•Pre-Operative–More planning time–More cost•Post-Operative–Faster healing time–Less likely for infection–Cost distribution to hospital and insurance•Most Importantly: Corrects a currently inoperative conditionProject DescriptionPlan of Action•Project Description•Project Management•Considerations•Data•Contacts•Conclusions•Lessons LearnedInitial Proposed Dates•2.22.01 Official Start Date•3.1.01 Meetings scheduled/attended and research on potential evacuation and filler material•3.8.01 Research weight bearing material•3.15.01 Read papers, begin brainstorming on designs, purchase material and background reading.•3.22.01 Model different designs and evaluate according to the constraints theoretically•4.7.01 Begin prototyping and testing of different size tubing and wires with tool constraint, filling•4.14.01 Evaluating different prototypes •5.1.01 Completion of project and documentationProject ManagementProgress by Checkpoint•2.22.01 Official Start Date•3.1.01 Meetings scheduled/attended and research on potential evacuation and filler material•3.8.01 Research weight bearing material•3.15.01 Read papers, begin brainstorming on designs, purchase material and background reading.•3.22.01 Model different designs and evaluate according to the constraints theoretically•CheckpointProject ManagementCurrent Status•4.30.01 Meeting with Dr. Horowitz.•5.1.01 Met with Mark Kuntz, set up lab meeting•5.7.01 Wire material arrives Tubing from Wilmer Oncology(Thanks Aaron)•5.8.01 Mark Kuntz, Undergraduate Design Lab furnace, plate (machine shop), potential testing•5.9.01 Tubing arrives Mechanical setting/testing of wires•5.10.01 Preparation for final presentation Mechanical setting/testing/loading of wiresProject ManagementRelevant Papers•Yang, F., Wu, K.H., Pu, Z. J. “The Effect of Strain Rate and Sample Size Effects on the Superelastic Behavior of Superelastic Alloys” Proceedings of the Second International Conference on Shape Memory and Superelastic Technologies. (CA) 1997, p 23-28.•Berg, B. “Twist and Stretch: Combined Loading of Pseudoelastic NiTi Tubing” Proceedings of the Second International Conference on Shape Memory and Superelastic Technologies. (CA) 1997, 443-448.•Ueki, T., Mogi, H., Horikawa, H. “Torsion Property of Ni-Ti Superelastic Alloy Thin Tubes” Proceedings of the Second International Conference on Shape Memory and Superelastic Technologies. (CA) 1997, 467-472.•Yang, Jianhua. “Fatigue Characterization of Superelastic Nitinol”. Proceedings of the Second International Conference on Shape Memory and Superelastic Technologies. (CA) 1997, 479-484.Plan of Action•Project Description•Project Management•Considerations•Data•Contacts•Conclusions•Lessons LearnedConsiderations•Torque•Repeat cycling (Compression/Tension)–Strain Rate –Fatigue•Angulation to gain access to site•Room for tools and evacuation•Tight fit vs Loose fit•Range of MotionConsiderationsAdditional Considerations after Testing•Force Generated –Rotational Mechanism•Crank•Attachment to drill bit head•How can you keep track of the site•General Testing Methods•Importance of Irrigation/Suction due to Force GenerationConsiderationsSetting and Shaping Superelastic SMA•Shape–2 Aluminum plates–30, 45, 90 degree threads drilled as guides–2 bolts•Furnace–500C for 15 minutes–Slow cooling timeEffects of Rotational Movement•Types–Crank–Attachment to drill bit head•~500 rotations/minute–How can you keep track of the siteEffects of Cyclic WearForce GenerationCyclic Strain vs FractureConsiderationsMechanical Testing•Methods–Tensile Strength–Force for Compression•Parameters–Copper tube•Straight •45 degree –Different bends/lengthsCurrent Choices of Angulation in Testing and Considerations•Angles of wire end effector/tubing•Length of wire/tubing from bend to tipKEY: Accessing all of the site with angles/length•Force Generated•Cyclic loading/compression/friction with different end effectors and tubingConsiderationsPlan of Action•Project Description•Project Management•Considerations•Data•Contacts•Conclusions•Lessons LearnedParameters•Wire Degree Bends: –80 degree bend–40 degree bend–30 degree bend•Wire Thickness–0.0020” and 0.0010”•Tube Thickness 45 degree bend–0.0028” and 0.0017”Data (10 trials + highest and lowest trial)Angle thickness 0.0020”Length Insert (lbf) Withdraw