anatomical bend fixture

Problem

The motor in the existing anatomical bend fixture causes instability to the fixture, thus affecting the motion of the pump, efficiency, accuracy, and continuous motion.

Objective

To revise the existing anatomical bend fixture (inherited from a previous co-op) and create an ergonomic design of the anatomical bend fixture with multiple analyses involving, ease of use, occupancy of space, sample size, and so forth.

Skills Employed

• SOLIDWORKS 3D CAD model
• Technical 2D drawings for large assemblies with tolerances
• Machine shop manufacturing and tool use (tapping, drills, sanding)
• Working with electromechanics and DC motors
• Documentation of fixture according to company’s protocols
• Testing fixture design/mechanical testing

Approach

After working with my mentor on the technical and design requirements of the fixture, I performed a shape analysis on how the heart pump would move in the current version of the fixture compared to clinical outcomes. Following the shape analysis, I started to brainstorm some design change ideas and areas of improvement.

I designed various ways to stabilize the motor wobble using SOLIDWORKS. After testing each design, I was able to come to a decision on which design was best suited to stabilize the motor wobble. I also designed a way to incorporate a small shaft and make a linkage to avoid frictional wear issues between componentes. After finalizing all of the components, I was able to get these parts sent out for quick manufacturing and test the fixture in-house.

Figure 1. 3D CAD model of anatomical bend fixture - Front View

Results

The linear bend cyclic bend anatomical fixture successfully accomplished its design goals. The fixture no longer has a motor wobble, performs the full motion, and has been updated and documented into the system to be incorporated into the next round of verification testing.

Figure 3. Final Anatomical bend fixture - Front View

Figure 4. Final Anatomical bend fixture - Side View