RADIO TELEMETRY OF INTRAOCULAR-PRESSURE INVITRO

  • 1 January 1977
    • journal article
    • research article
    • Vol. 16  (2) , 168-171
Abstract
A guard ring pressure transensor, using the principles of surface applanation, was used to transmit intraocular pressure (IOP) from a cadaver canine eye. The transensor consisted of a passive resonant coil/capacitor combination, made pressure sensitive by the movement of a small ferrite plate which acted as its applanating surface. Oscillation induced in the transensor by a remote grid dip oscillator (GDO) was monitored by a digital frequency counter (DFC). The resonant frequency of oscillation in the transensor bore a linear relationship to the in vitro IOP in 3 separate experiments (coefficient of determination for linear regression, r2 = 0.90). Radio telemetry is feasible, using a miniature applanating passive radio telemetric device for continual monitoring of IOP.

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