All of the images are from the same 75 nm NPN four-channel chip. The first images shows the edges from the backside of the chip, showing how flat it is (without the oxynitride present on the top side). There is…
Author: Dean Johnson
Dr. Johnson is a Research Assistant Professor in Nephrology who was awarded an R01 in 2020. He earned his Ph.D. in Microsystems Engineering from RIT and is currently working on hemodialysis devices based on the ultrathin nanoporous membranes developed earlier by this group.
SEM 4 slot 75 nm NPN
SEM of lot # 1208, four-slot 75-nm NPN at 1014x, 1972x, 4101, and 5351x mag. The next image is with a tilted sample. (from the same lot of chips #1208 4-slot 5.4 mm chips) The next five show the edge…
Posted in NRG
Kidney Health Initiative Roundtable: Roadmap to Advanced RRT
(This post is not finished, but my flight keeps getting delayed in 20 minute increments, so better to publish it unfinished than to not get it up before NRG in case I’m not able to make it. Please forgive typos…
Posted in NRG
CRIC and CKiD (Chronic Kidney Disease Studies)
There are two longitudinal studies for Chronic Kidney Disease (CKD). Ancillary studies can be set up to share the collected data, bio samples, or even request additional data to be collected. These Ancillary studies can be funded through normal channels,…
Posted in NRG
Latest 2-chip Small Animal HD results
While the latest small animal studies was meant to be a test of the new 1-chip bonded HD devices, device failure resulted in the use of the older 2-chip 10-channel HD devices as used on previous experiments. Here is all…
Mini peristaltic pump for Wearable HD: power and battery life
Power and battery life for wearable hemodialysis. The pump(s) will consume the most energy of all the components of the system. Other power consumers could include, control circuits, wireless communication, display and warning lights, depending on design. A continuous display…
Posted in Knowledge
IEEE Spectrum: Three Artificial Kidneys…
“Three ways to build an artificial kidney” This IEEE Spectrum article list three efforts to make an artificial Kidney. The first is the AWAK, kidney on a belt. They don’t have the latest images for this, only the original very…
Posted in NRG
ASAIO notes
ASAIO /əˈsī ō/ noun American Society of Artificial Internal Organs. There is an associated Journal, “ASAIO Journal”, and a yearly conference for the presentation and discussion of research relating to advances in medical device technology. While the initial focus of…
Posted in NRG
SEM of 4-hour Hemodialysis Membranes
To image the blood side (in-channel) side of the membranes, I transferred the membranes of a HD chip onto another wafer segment (SiN wafer: 4534) The transfer wasn’t clean but I got some good images. These membranes were exposed to…
Posted in NRG
Blood and PBS in large Lift-off device.
I attempted to clear the large format lift-off devices (from Josh). I was unable to clear, in a reasonable amount of time (< 2 hours) by pumping IPA. So I switched to PBS then Blood and blue-dyed PBS (dye is…
Posted in NRG
