Testing and Implementation (Last Battle)
– Thomas N. Shetui.
Finally after all the learning and designing done in the course of eight (8) weeks in the DIT Design Studio, we came up with products that are expected to solve different problems that were found through needs findings sessions. Intensive primary and secondary research increased the depth of information and understanding. On my side, with my fellow engineering student Greg Luhambati, we came up with the Kenfix (KA-105) silicone sealant based subclavian access central line ultrasound training model seen in Fig. 1.
Figure 1: KA-105 sealant based model
Using the readily available plastic human torso, we filled it with the proposed material i.e. KA-105 sealant, after molding important vascular structures which are the artery and vein openings. We placed a tube extending outward from the hole simulating the arterial nature, i.e. hard to compress and filled with fluid most of the time. The tube will enable a doctor or any other health practitioner working on the model to insert fluid into the artery hole realistically in case a trainee punctures the artery and draws the needle to suck blood out (in this case any fluid put in the artery). This is the actual case when working with the human subject because when an artery is punctured, what comes out is blood. The vein tubular structure of the model was left tightly sealed to simulate actual vein behavior when punctured.
Finally needle tests on the already solidified subclavian access points were done to subclavian access central line procedures. Needles required for central line procedures testing and implementation are:-
– Small anesthetizing needle (25 gauge by 1 inch),
– Large anesthetizing needle (22 gauge by 1.5 inches),
– Introducer needle (18 gauge by 2.5 inches).
Each needle was tested on the finished product seen in Figure 1. and the results were quite promising due to the high integrity of KA-105 material. After successful needle tests, we were hoping to go for final ultrasound tests but time was running out so they weren’t done. But we’re 99.9% confident that the model will train people at a high accuracy rate.
Figure 2: Central line needles