Clip Stability Test
A demonstration of the clip stability test, performed with the device, a syringe, a string, and a force gauge.
Test Description
In order for the device to be usable in the clinical setting, it needed to be easily removed from the syringe when desired while not detaching accidentally. The purpose of this test was to ensure that the device met this need, by measuring the force required to remove the device from a syringe. This was measured by attaching the clip to a plunger, tying a string to the clip, and attaching the string to a force gauge. The device was then pulled until it detached, and the final force was measured.
Results
The device required over 31 N of force to be removed from the syringe, which exceeded the required range of detach force of 4-22 N. The device therefore did not meet the requirement. This issue will be addressed in future clip iterations, by designing a clip that does not attach to the plunger as tightly.
Bar Distortion Test
A demonstration of the bar distortion test, in which the bar of the device was bent down (vertical) and sideways (horizontal) by a certain distance.
Test Description
In order to ensure that the bar would not deform under a certain amount of stress, the bar secured to a vice near the clip, and was bent vertically and horizontally. The amount of deformation was measured as the difference between initial and final position. This was repeated for five trials in each direction.
Results
After 5 mm of vertical and 0.5 mm horizontal displacement, the bar did not show any measurable distortion.