Title :
Micro coils for an advanced system for measuring intraocular pressure
Author :
Ullerich, Stella ; Mokwa, Wilfried ; Bögel, Gerd Vom ; Schnakenberg, Uwe
Author_Institution :
Inst. for Mater. in Electr. Eng., Techn. Univ. Aachen, Germany
Abstract :
A miniaturised transponder system consisting of a chip and a micro coil for measuring intraocular pressure continuously is presented. The system will be integrated in the haptic of a soft artificial intraocular lens. Calculations show that the capacitance of the coil influences the DC voltage drop significantly. With respect to to reliable system function a 20 μm thick coil with an outer diameter of 10.3 mm, an inner diameter of 7.7 mm, 16 windings and a gap of 20 μm between the windings was selected. Measurements show a good agreement between calculated and measured values. Wireless pressure measurements were carried out showing a linear behaviour of the output signal with respect to the applied pressure
Keywords :
biomechanics; biomedical equipment; biomedical measurement; coils; eye; ophthalmic lenses; pressure measurement; transponders; 10.3 mm; 20 mum; 7.7 mm; advanced intraocular pressure measurement system; applied pressure; chip; micro coils; miniaturised transponder system; output signal linear behaviour; reliable system function; soft artificial intraocular lens haptic; windings; wireless pressure measurements; Capacitance; Coils; Fabrication; Lenses; Pressure measurement; Semiconductor device measurement; Surgery; Telemetry; Transponders; Voltage;
Conference_Titel :
Microtechnologies in Medicine and Biology, 1st Annual International, Conference On. 2000
Conference_Location :
Lyon
Print_ISBN :
0-7803-6603-4
DOI :
10.1109/MMB.2000.893828
