Transfection high-voltage controller

  • US 5,642,035 A
  • Filed: 06/16/1994
  • Issued: 06/24/1997
  • Est. Priority Date: 06/16/1994
  • Status: Expired due to Term
First Claim
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1. An apparatus for directing a first predetermined current profile at a second predetermined high-voltage level to a chemical solution, comprising:

  • a hi-joule switch having a gate, an input for receiving a high-voltage current, and an output for emitting a high-voltage current;

    a limit impedance having a first terminal coupled to said output of said hi-joule switch and a second terminal coupled to the chemical solution;

    an electric charge storing device, coupled to said input of said hi-joule switch, for providing said hi-joule switch with said high-voltage current;

    a control processor, coupled to said gate of said hi-joule switch, for asserting a gating signal to activate said hi-joule switch when a voltage-level of said electric charge storing device equals the second predetermined high-voltage level; and

    a resistance measuring circuit, coupled to said second terminal of said limit impedance and to said control processor, for measuring a resistance through the chemical solution to a reference voltage.

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