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PHYSIOLOGICAL SIGNAL TRANSMITTER FOR USE INSIDE THE BODY

  • US 3,682,160 A
  • Filed: 10/16/1969
  • Issued: 08/08/1972
  • Est. Priority Date: 10/16/1969
  • Status: Expired due to Term
First Claim
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1. A medical transmitter adapted for transmission of an electric signal corresponding to a physiological variable in a human body, which comprises detecting means having two detecting terminals provided with a detected voltage E relating to said physiological variable;

  • limiting network means which has two input terminals connected with said two detecting terminals and which has two output terminals provided with a limiting current I therefrom;

    a storing capacitor of a capacitance, Co, which is connected with said two output terminals; and

    oscillator means which has two energizing terminals connected with two terminals of said storing capacitor and energizable by an electric charge stored in said storing capacitor which functions as a power source for said oscillator means, said oscillator means for starting oscillation in an oscillation frequency f when a voltage between said two energizing terminals rises up to a starting voltage Vt and for stopping said oscillation when said voltage between said two energizing terminals falls down to a stopping voltage Vp, and said oscillator means having a leakage current I1 adapted to flow therethrough upon the cessation of said oscillation and an actuating current Ia to flow therethrough during oscillation, said oscillating means having the following operating characteristic;

    0 <

    (I1)max <

    (I)min <

    (I)max <

    (Ia<

    (Ia)max <

    <

    Co.f.(Vt-Vp) where (I1)max is a maximum value of said leakage current I1, (I)min and (I)max are a minimum value and a maximum value of said limiting current I, respectively, and (Ia)min and (Ia)max are a minimum value and a maximum value of said actuating current Ia, respectively;

    whereby said oscillator means is intermittently oscillating with an intermittent oscillation period which is variable with a change in said detected voltage.

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