Implantable Medical Lead

• US 20090118808A1
• Filed: 01/08/2009
• Published: 05/07/2009
• Est. Priority Date: 09/23/2004
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Reinke, James D., Belacazar, Hugo A., Ecker, Robert M.
• Granted Patent: US 8,005,551 B2
• Time in Patent Office: Days
• US Class Current: 607/122
• CPC Class Codes: A61B 5/02055 Simultaneously evaluating both cardiovascular condition and temperature
• CPC Class Codes: A61B 5/145 Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissuemeasuring of blood pressure or blood flow A61B5/02; non-radiation detecting or locating of foreign bodies in blood A61B5/06
• CPC Class Codes: A61B 5/14532 for measuring glucose, e.g. by tissue impedance measurement
• CPC Class Codes: A61N 1/05 for implantation or insertion into the body, e.g. heart electrode A61N1/06 takes precedence
• CPC Class Codes: A61N 1/056 Transvascular endocardial electrode systems
• CPC Class Codes: A61N 1/36514 controlled by a physiological quantity other than heart potential, e.g. blood pressure controlled by two or more physical parameters A61N1/36585

Abstract

An implantable medical lead includes a device, such as a physiological sensor, that is coupled to one or more stimulation/sensing sensing conductors within the lead. When the implantable medical lead is coupled to an implantable medical device, the device carried by the lead both receives power from, and communicates with the implantable medical device via the one or more stimulation/sensing sensing conductors. Each of the one or more stimulation/sensing sensing conductors is also coupled to an electrode that is exposed to body tissue.

Claims

1. An implantable medical device comprising:

signal generation circuitry that delivers power to a sensor carried by an implantable medical lead that is connected to the implantable medical device, wherein the lead includes at least one conductor that is coupled to an electrode and the sensor, and the signal generation circuitry delivers power to the sensor via the conductor; and

a processor to control delivery of power by the signal generation circuitry, communicate with the sensor via the conductor, and suspend a function of the implantable medical device during at least one of delivery of power to the sensor or communication with the sensor.

2. The implantable medical device of claim 1, wherein the processor suspends at least one of autocapture detection, lead impedance measurement, battery life estimation, thoracic impedance measurement, minute ventilation measurement, P-wave sensing, R-wave sensing, or T-wave sensing.

3. The implantable medical device of claim 1, further comprising a therapy delivery module that delivers stimulation to a patient via the conductor and the electrode.

4. The implantable medical device of claim 3,

wherein the therapy delivery module comprises the signal generation circuitry, and delivers power to the sensor as part of the delivered stimulation, and

wherein the processor controls the therapy delivery module to increase an amplitude of the stimulation during delivery of power.

5. The implantable medical device of claim 3, wherein the processor provides a signal to the sensor via the conductor, the signal indicating an upcoming delivery of stimulation by the therapy delivery module, and wherein the sensor disconnects an energy storage element from the conductor in response to the signal.

6. The implantable medical device of claim 5, wherein the therapy delivery module measures at least one of voltage, current, or impedance during delivery of stimulation, and the processor receives data from the sensor by detecting coupling of a load to the conductor by the sensor during delivery of stimulation based on the measured voltage, current, or impedance.

7. The implantable medical device of claim 1, wherein the implantable medical device comprises a cardiac pacemaker, and the processor controls delivery of power by the signal generation circuitry and communicates with sensor during a refractory period of the patient.

8. An implantable medical lead comprising:

a first electrode;

an electrical conductor electrically coupled to the first electrode; and

a sensor coupled to the conductor in series with a current path between the first electrode and a second electrode not carried by the lead,

wherein the sensor receives power from an implantable medical device and communicates with the implantable medical device via the conductor and the current path, and includes an energy storage element to store power received from the implantable medical device, and

wherein the implantable medical device at least one of delivers electrical stimulation to a patient or senses electrical activity within the patient by the via the conductor and the electrode.

9. The implantable medical lead of claim 8, wherein the first electrode comprises a tip electrode for delivering cardiac pacing pulses from the implantable medical device cardiac tissue and sensing electrical activity of a heart of the patient.

10. The implantable medical lead of claim 8, wherein the energy storage element is selectively coupled in parallel with the implantable medical device to receive power from the implantable medical device, and the sensor includes a communication module that is selectively coupled in parallel with the implantable medical device for communication with the implantable medical device.