Active implantable medical device which includes a circuit of RF telemetry
First Claim
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1. An active implantable medical device, comprising:
- a principal circuit;
an auxiliary RF telemetry circuit;
a supply battery having an internal resistance;
a voltage multiplying stage comprising a plurality of condensers connected by a plurality of switches for multiplying a voltage delivered by the supply battery by charging the plurality of condensers; and
a regulating circuit comprising an accumulator, the accumulator having a load level and being connected to a load circuit,wherein the supply battery, while providing power to the principal circuit with a first voltage, charges the plurality of condensers of the voltage multiplying stage during a first phase of a variable period and charges the accumulator to a second voltage by changing connectivity among the plurality of condensers using the plurality of switches during a second phase of the variable period;
wherein the load circuit detects a terminal voltage of the accumulator; and
wherein the accumulator delivers power with the second voltage to the auxiliary RF telemetry circuit, and the load circuit maintains the accumulator at a predetermined load level by varying the variable period and/or controlling at least one switch of the plurality of switches of the regulating circuit in response to the detected terminal voltage of the accumulator.
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Abstract
An active implantable medical device having an RF telemetry circuit. The device is in particular a stimulation, resynchronization, defibrillation and/or cardioversion device. It includes a principal circuit, an RF telemetry auxiliary circuit and a supply battery for the principal and auxiliary circuits. It is envisaged to have between the supply battery and the auxiliary circuit a regulating circuit including an accumulator of electric power coupled with the auxiliary circuit to deliver a current ready to feed the auxiliary circuit, and a load circuit coupled with the supply battery to maintain the accumulator on a predetermined level of load.
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Citations
16 Claims
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1. An active implantable medical device, comprising:
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a principal circuit; an auxiliary RF telemetry circuit; a supply battery having an internal resistance; a voltage multiplying stage comprising a plurality of condensers connected by a plurality of switches for multiplying a voltage delivered by the supply battery by charging the plurality of condensers; and a regulating circuit comprising an accumulator, the accumulator having a load level and being connected to a load circuit, wherein the supply battery, while providing power to the principal circuit with a first voltage, charges the plurality of condensers of the voltage multiplying stage during a first phase of a variable period and charges the accumulator to a second voltage by changing connectivity among the plurality of condensers using the plurality of switches during a second phase of the variable period; wherein the load circuit detects a terminal voltage of the accumulator; and wherein the accumulator delivers power with the second voltage to the auxiliary RF telemetry circuit, and the load circuit maintains the accumulator at a predetermined load level by varying the variable period and/or controlling at least one switch of the plurality of switches of the regulating circuit in response to the detected terminal voltage of the accumulator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification