Video Pitch
Cystoscope (Spring 2022)
For my Advanced Design and Manufacturing course, I redesigned a cystoscope handle to improve doctor and patient experience. Cystoscopes are used to treat bladder cancer and in other medical procedures.
I developed a mood board, sketches, CAD files with Autodesk Fusion 360, control drawings, and 3D printed prototypes to iterate and improve my design.
The cystoscope was developed to be injection moldable with a uniform wall thickness and draft.
It is easily assembled with a tongue and groove joint to connect the two plastic halves of the device. Fasteners are used to secure the device together, with concentric, upstanding bosses extruded from the interior of both halves, where one side has a counterbore and through hole for the fastener, and the other has a threaded insert.
Sketched Ideas
Design Animation
Cross Section of Concentric Bosses for Fasteners
Control Drawing
3D Printed Prototype
After the final design was complete, I performed FEA on the cystoscope to improve its durability and safety.
For this analysis, I isolated the end of my device. 40N was then applied to the end of the metal sheath of the cystoscope. The initial FOS was 1.5.
Initial FEA
To improve the FOS, the metal ring on the sheath, which is used to keep it in place, was moved closer to the edge of the cystoscope-- from a 7.5 mm offset to a 6 mm offset. The ring length was also increased from 2 mm to 5 mm. Lastly, the outer diameter of the ring was adjusted from 11 mm to 10.5 mm. The final FOS was 2.07 .
Final FEA
