Testing Plan

The main function of LILAC is to hold the patient hand still during the procedure. This securement helps a physician to easily insert a catheter through the insertion point without having to constantly fix a patient’s hand position. Therefore, to ensure the effectiveness of the device, a test will be performed on the rotating arm board and elbow cup. During a procedure, the securement method will undergo forces from the arm wanting to fall back to the patient’s side and frictional forces from the physician pushing a catheter inside the patient. These forces are 12 lbs from maximum arm’s weight of 95% population, 4 lbs maximum push measured from a physician, and a 25% safety factor. The total forces result in 20 lbs. Therefore, each component requiring this test will be pushed and torqued on all faces interacting with the arm at 20 lbs using a validated force gauge. A passing grade will be given if the securement method does not fail or disengage.

In addition, an arm stability test will be carried out to make sure the insertion point on a patient’s arm not deviate more than 1 inch from its set position once locked. With a stable insertion point, the physician must not have to continually adjust the arm during a procedure. An one-inch radius circle from the initial point will allow continued access to the site throughout the procedure. For this test, a physician will perform a predetermined mock procedure on a subject moving the hand as he or she normally would in true surgery. Video recording will be set up and later analyzed using Matlab to determine the maximal displacement of the insertion point in the mock procedure.