Active implantable medical device which includes a circuit of RF telemetry

• US 20060100674A1
• Filed: 10/12/2005
• Published: 05/11/2006
• Est. Priority Date: 10/12/2004
• Status: Active Grant

• Current Assignee: Sorin CRM USA (MicroPort Scientific Corp.)
• Original Assignee: Ela Medical S.A. (LivaNova Plc)
• Inventors: Molin, Renzo Dal
• Granted Patent: US 7,747,331 B2
• Time in Patent Office: Days
• US Class Current: 607/60
• CPC Class Codes: A61N 1/37223 Circuits for electromagnetic coupling
• CPC Class Codes: A61N 1/378 Electrical supply
• CPC Class Codes: Y10S 323/911 Medical electronics

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.

Claims

1. An active implantable medical device, comprising a principal circuit, an auxiliary RF telemetry circuit, and a supply battery for the principal and auxiliary circuits, said device characterized in that between the supply battery and the auxiliary circuit it has a regulating circuit comprising:

an accumulator of electric power, coupled with the auxiliary circuit to deliver a current to the auxiliary circuit; and

a load circuit of the accumulator, coupled with the supply battery to bring and maintain a predetermined load to the accumulator.

2. The device of claim 1, wherein said accumulator is a rechargeable battery.

3. The device of claim 1, wherein said accumulator is a condenser.

4. The device of claim 1, wherein the voltage corresponding to the predetermined load is higher than the voltage delivered by the supply battery, and where the load circuit of the accumulator includes a voltage multiplying stage.

5. The device of claim 1, wherein the load circuit of the accumulator is a circuit with intermittent and cyclic operation, with alternation of the regulating circuit and feeding cycles of the principal circuit.

6. The device of claim 5, wherein the cyclic report/ratio of the intermittent operation of the load circuit is a variable report/ratio function of the internal resistance of the supply battery, and where a relative duration of the feeding cycles of the regulating circuit decreases when the internal resistance increases.

7. The device of claim 5, wherein the cyclic report/ratio of the intermittent operation of the load circuit is a variable report/ratio function of the load level of the accumulator, and where a relative duration of the feeding cycles of the regulating circuit decreasing when the aforementioned level of load increases.

8. The device of claim 1, wherein the load circuit can stop the load of the accumulator when the level of terminal voltage of the accumulator reaches a predetermined upper limit.

9. The device of claim 1, wherein the load circuit can stop the load of the accumulator when the charging current of the accumulator reaches a predetermined lower limit.

10. The device of claim 1, wherein the load circuit can stop the load of the accumulator after completion of a given maximum duration.