Pelvic Osteolysis: Evacuation and Filling

Felicia Shay

Computer Integrated Surgery II

Checkpoint Presentation

Plan of Action

• Project Description/Deliverables

• Project Plan

• Key Dates

• Progress to Date

• Design

• Problems Encountered/Solved

• Dependencies

Project Description

• ID material/potential

• Plan for tool design

• Explore Options

• Evaluate

• Build tools

• Testing

Deliverables

Minimal:

• Research and documentation of potential material

– Tools

– Filling

• Potential tool design with evaluations and considerations

• Bone filler material and analysis of potential material

Expected:

• Prototyping of instrument and filling

• Modeling and evaluation of each

• Potential integration and mechanism for whisking, evacuation and filling

Maximal:

• Integration with robot

Background and 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– Feasibility

Plan of Action

• Project Description/Deliverables

• Project Plan

• Key Dates

• Progress to Date

• Design

• Problems Encountered/Solved

• Dependencies

Action

• 1.0 Communication • 2.0 Research

– 2.1 Tool– 2.2 Osteolysis– 2.3 Filler

• 3.0 Optimal design• 4.0 Implementation • 5.0 Integration and Testing• 6.0 Documentation

Key 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 based on evaluation

methods• 5.1.01 Completion of project and documentation

Progress to Date

• 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• 4.14.01 Evaluating different prototypes based on evaluation

methods• 5.1.01 Completion of project and documentation

Revised 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• ?????? Begin prototyping and testing of different size tubing

and wires with tool constraint• Evaluating different prototypes based on evaluation methods• Completion of project and documentation

Relevant 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.

Considerations

• 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 Motion

Twist Stretch: Combined Loading of Psuedoelastic NiTi Tubing

Stress Load

(M Pa)

Unload

(M Pa)

Strain Calculation

Torsion Wire 379.2 172.4 (O.D.)(Angle rotation)/(2L)

Tube 296.5 144.8 (O.D.)(Angle rotation)/(2L)

Bend Wire 896.4 482.6 (O.D.)(Angle rotation)/(2L)

Tube 579.5 262.0 (O.D.)(Angle rotation)/(2L)

Cyclic Strain vs Fracture

Affects of Pathway in Tubing

• Considerations:– Irrigations and Suction

• Tight fit– I.e. catheter

• Spacers– Irrigation and Suction considerations– Trajectory

Progress Status

• Problems– Integration with robot

• Needs more design +collaboration

– Accessing tiny locations• Visible under fluoroscopy• Small end manipulators• Problems

– Addressing all considerations and constraints

Dependencies

• Receipt of the materials to begin prototyping