Passive Liquid Draw Using Micro Needles
Date of Award
Blood test, Needle design, Hypodermic needles
The blood draw portion of an in-home blood testing system was investigated with focus on ease of use, pain reduction, flow rate, and the total volume of blood drawn. Traditional style stainless steel hypodermic needles were used in order to investigate the effects of size, viscosity, surface tension, the presence of a porous medium, clogging by tissue, and surface coatings on flow rate through needles in the presence of simulated human capillary bed blood pressure. Non-coring point style needles were found to operate the best in terms of resistance to clogging. Surface effects were found in as large as 26 gauge (0.464 mm OD) needles at low pressure, and were prominent in 31 gauge (0.261 mm OD) and 33 gauge (0.210 mm OD) needles at high pressure. An array of 4-6 needles was conceived to enhance system reliability in light of complicating factors such as viscosity, random obstruction by porous medium, and surface tension.
Copyright is held by the author. Permanently suppressed.
Huber, Nathan M., "Passive Liquid Draw Using Micro Needles" (2015). Electronic Theses and Dissertations. 2188.
Received from author
Nathan M. Huber