Showing papers by "Tingrui Pan published in 2002"
01 Dec 2002
TL;DR: Pressure measurements with and without the valve clearly demonstrated the persisting effect of the microvalve in regulating the intraocular pressure subsequent to the fibrous capsule formation.
Abstract: In this paper, we report on a microfluidic test-bed for in-vitro simulation of flow characteristics of valved-glaucoma drainage devices. A nanopore membrane is used to mimic the fibrous tissue encapsulation of the sub-conjunctival plate following surgery. Pressure measurements with and without the valve clearly demonstrated the persisting effect of the microvalve in regulating the intraocular pressure subsequent to the fibrous capsule formation.
9 citations
01 Dec 2002
TL;DR: In this article, the authors report on the tissue temperature measurement and heat transfer mechanisms for inductively powered microsystems and show that heat transfer from the transmitter coil can be the dominant mechanism in tissue heating for applications that require continuous operation.
Abstract: In this paper, we report on the tissue temperature measurement and heat transfer mechanisms for inductively powered microsystems. It is shown that heat transfer from the transmitter coil can be the dominant mechanism in tissue heating for applications that require continuous operation (e.g., neural and visual prosthetics). For long-term operation, this thermal effect shouldn't be overlooked or underestimated for tissue safety. Tissue temperature measurements in open and thermally isolated environments are used to verify the above hypothesis. A high-efficiency class-E transmitter is used as the main power source. Heat is generated within the transmitter coil and is transferred to the tissue by conduction, convection, and radiation. Open-air temperature measurements in fat and muscle tissue show a net increase of 0.8 and 0.7/spl deg/C respectively. However, thermally isolated sample show a lower temperature increase (fat: 0.6/spl deg/C, muscle: 0.5/spl deg/C).
2 citations