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Medical system comprising implants

  • US 9,610,455 B2
  • Filed: 07/19/2010
  • Issued: 04/04/2017
  • Est. Priority Date: 07/17/2009
  • Status: Active Grant
First Claim
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1. A medical system comprising internal parts for implantation in a patient and external parts for use externally to the patient,the external parts comprising an energy source equipped with a primary coil for inductively transmitting energy to implantable parts and an external control unit for the control of the energy source,the internal parts comprising an electrically powered medical device, an energy receiver equipped with a secondary coil for inductively receiving energy for the medical device from the external energy source and an internal control unit for the control of the internal parts,the internal control unit is arranged to wirelessly transmit feedback information to the external control unit, said feedback information comprising information based on or relating to a first, a second parameter and a third parameter, with the first parameter being based on an energy balance between the amount of energy received in the energy receiver and the amount of energy used by the medical device over a certain amount of time and the second parameter being based on information relating to a coupling factor between the primary and the secondary coils, wherein the coupling factor compares the transmitted amount of energy in the primary coil with the received amount of energy in the secondary coil, and the third parameter being based on at least one of;

  • a) in which the medical device also comprises a current regulator arranged to keep a current constant, the internal control unit being arranged to determine a difference between an input current to the current regulator and the current which the current regulator is arranged to keep constant, in which system said third parameter comprising or being based on said difference,b) in which the system also comprises a voltage regulator arranged to keep a voltage constant, the internal control unit being arranged to determine a difference between an input voltage to the voltage regulator and the voltage which the voltage regulator is arranged to keep constant, in which system said third parameter comprising or being based on said difference, and whereinthe system being adapted to take into account at least both the first, second and third parameters to determine the amount of energy inductively transmitted from the primary coil to avoid heat generation within the internal parts due to excess energy.

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