Supply circuit for implantable medical devices

• US 7,852,052 B2
• Filed: 02/28/2006
• Issued: 12/14/2010
• Est. Priority Date: 02/28/2006
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Vernon, Scott D.
• Primary Examiner(s): Vu; Bao Q
• Assistant Examiner(s): Zhang; Jue
• Application Number:
  US11/363,770
• Publication Number:
  US 20070203528A1
• Time in Patent Office: 1,750 Days
• Field of Search: 323/269, 323/270, 323/272, 307/24, 607/4, 607/9, 607/12
• US Class Current: 323/269
• CPC Class Codes: A61N 1/378 Electrical supply
• CPC Class Codes: H02J 2310/23 The load being a medical device, a medical implant, or a life supporting device
• CPC Class Codes: H02J 7/0063 with circuits adapted for supplying loads from the battery
• CPC Class Codes: H02J 7/00712 the cycle being controlled or terminated in response to electric parameters
• CPC Class Codes: H02J 7/345 using capacitors as storage or buffering devices

Abstract

A supply circuit for an implantable medical device (IMD) is presented. The supply circuit includes a battery, a high current circuit, a current-modifying component, a low current circuit, and a capacitor. The low current circuit is connected to a first terminal of the battery. A current-modifying component is connected to the battery, a capacitor, and to a high current circuit.

Claims

1. A supply circuit for an implantable medical device (IMD) comprising:

a battery;

a low current circuit coupled to the battery;

a current-modifying component coupled to the battery;

a high current circuit coupled to the current-modifying component; and

a capacitor coupled to the current-modifying component and to the high current circuit

wherein the current-modifying component comprises;

a resistor and a switch connected in series between the battery and the capacitor; and

a voltage converter which includes an input terminal and an output terminal, the input terminal connected to the battery and the output terminal connected to the capacitor,

wherein the resistor and the switch are in parallel with the voltage converter.

2. A supply circuit for an implantable medical device (IMD) comprising:

a battery;

a low current circuit coupled to the battery;

a current-modifying component coupled to the battery;

a high current circuit coupled to the current-modifying component; and

a capacitor coupled to the current-modifying component and to the high current circuit wherein the current-modifying component comprises;

a resistor and a first switch connected in series between the battery and the capacitor;

a second switch connected in parallel with the resistor and the first switch between the battery and the capacitor; and

a voltage converter having an input terminal connected to the battery and an output terminal connected to the capacitor.

3. A method of controlling current in a supply circuit for an implantable medical device (IMD) comprising:

providing a battery;

coupling a low current circuit to the battery;

coupling a current-modifying component to the battery;

coupling a capacitor to the current-modifying component and a fixed voltage; and

coupling a high current circuit to the current-modifying component and to the capacitor, wherein the current modifying component being;

a resistor and a first switch connected in series between the battery and the capacitor;

a second switch connected in parallel with the resistor and the first switch between the battery and the capacitor; and

a voltage converter having an input terminal connected to the battery and an output terminal connected to the capacitor.

4. A method of controlling current in a supply circuit for an implantable medical device (IMD) comprising:

providing a battery;

coupling a low current circuit to the battery;

coupling a current-modifying component to the battery;

coupling a capacitor to the current-modifying component and a fixed voltage; and

coupling a high current circuit to the current-modifying component and to the capacitor, wherein the current path from the battery to the first node being established by;

a current source and a first switch connected in series between the battery and the capacitor;

a second switch connected in parallel with the current source and the first switch between the battery and the capacitor; and

a voltage converter having an input terminal connected to the battery and an output terminal connected to the capacitor.