Jian C Cao

US Patent:

6699200, Mar 2, 2004

Filed:

Mar 1, 2001

Appl. No.:

09/797031

Inventors:

Jian Cao - Maplewood MN
Brian B. Lee - Golden Valley MN
Spencer R. Hurd - Shoreview MN

Assignee:

Medtronic, Inc. - Minneapolis MN

International Classification:

A61B 502

US Classification:

600508, 128899

Abstract:

A medical device for multi-vector sensing of cardiac depolarization signals is disclosed. Specialized algorithm is implemented to enhance multi-vector electrode sensing. Further a geometric shape is optimized to enable space-volume efficiencies for deployment and navigation of the medical device for implant in a patient.

US Patent:

7027858, Apr 11, 2006

Filed:

Sep 11, 2002

Appl. No.:

10/238140

Inventors:

Jian Cao - Maplewood MN, US
Lee B. Brian - Golden Valley MN, US
Michael R. Kane - Higley AZ, US
Spencer R. Hurd - Shoreview MN, US

Assignee:

Medtronic, Inc. - Minneapolis MN

International Classification:

A61B 5/04

US Classification:

600521, 607 5

Abstract:

The present invention uses a R-wave sensing algorithm that uniquely combines an automatic threshold adjustment method with a new noise rejection technique. This algorithm has significant advantages in avoiding the sensing of T-waves, P-waves, and noise/artifacts. Detecting the presence of noise bursts uses features that determine if an R-R interval adjacent to or within the noise signal is valid. Circuitry that discriminates noise signals from R-waves can use any one of several features including, but not limited to, the following: detection events occurring so close together that they are outside normal physiologic heart rates; frequency content that is wider than that of QRS complexes; amplitudes that are different than the adjacent or encompassing R-waves; and amplitudes that display greater than normal variability. The present invention employs multiple discrete thresholds optionally with different decay constants, alone or in combination with one or more substantially constant magnitude sensing threshold.

US Patent:

7062315, Jun 13, 2006

Filed:

Apr 25, 2002

Appl. No.:

10/132773

Inventors:

Lev A. Koyrakh - Plymouth MN, US
Eugene Davydov - Stanford CA, US
Jeffrey M. Gillberg - Coon Rapids MN, US
Jian Cao - Maplewood MN, US

Assignee:

Medtronic, Inc. - Minneapolis MN

International Classification:

A61B 5/04

US Classification:

600515, 600518

Abstract:

A method of generating a template in an implantable medical device for implantation within a patient, and a processor readable medium for performing the method, that includes generating a template from collected events corresponding to the patient, delaying the generation of the template for a first predetermined time period in response to the template not being generated within a predetermined number of collected events, determining whether the template is valid, and monitoring the template to determine whether the template is an accurate representation of the patient.

US Patent:

7242978, Jul 10, 2007

Filed:

Dec 2, 2004

Appl. No.:

11/002482

Inventors:

Jian Cao - Shoreview MN, US
Jeffrey M. Gillberg - Coon Rapids MN, US
Chris J. Gennaro - Woodbury MN, US

Assignee:

Medtronic, Inc. - Minneapolis MN

International Classification:

A61B 5/04
A61N 1/00

US Classification:

600518, 600509, 600513, 600515, 607 4, 607 5, 607 6, 607 14, 607 25, 607 27

Abstract:

An implantable medical device and associated method for automatically generating morphology templates during fast cardiac rhythms, confirming a provisional template as a confirmed template, and using the confirmed template to classify subsequent detected arrhythmias. A provisional SVT template may be created during a fast ventricular rate and activated as a confirmed SVT template upon verification that the fast rate was due to an SVT. The confirmed SVT template may be used to discriminate SVT from VT/VF.

US Patent:

7333855, Feb 19, 2008

Filed:

Apr 15, 2005

Appl. No.:

11/107706

Inventors:

Bruce D. Gunderson - Plymouth MN, US
Jian Cao - Shoreview MN, US
Troy E. Jackson - New Brighton MN, US

Assignee:

Medtronic, Inc. - Minneapolis MN

International Classification:

A61N 1/08

US Classification:

607 27

Abstract:

A method and apparatus for determining oversensing in a medical device that includes sensing cardiac signals and detecting cardiac events via a first electrode configuration, determining the presence of an episode event in response to the detected cardiac events, and sensing the cardiac signals via a second electrode configuration. Amplitudes associated with a predetermined number of cardiac signals sensed via the second electrode configuration corresponding to the event episode are determined, and delivery of therapy is controlled in response to the determined amplitudes.

US Patent:

7496403, Feb 24, 2009

Filed:

Aug 31, 2005

Appl. No.:

11/217050

Inventors:

Jian Cao - Shoreview MN, US
Jeffrey M. Gillberg - Coon Rapids MN, US

Assignee:

Medtronic, Inc. - Minneapolis MN

International Classification:

A61N 1/00

US Classification:

607 27, 600510, 607 28

Abstract:

In an apparatus and a method for use in setting a sensing parameter of an implantable medical device (IMD) of a patient, cardiac data corresponding to a cardiac episode experienced by the patient is obtained from a sensing electrode associated with the IMD. At the time the cardiac data is obtained, the IMD is operated at a first setting of the sensing parameter. Based upon this cardiac data, a simulation is performed of cardiac event identification if the IMD were operated at a different setting of the sensing parameter. The simulated cardiac event identification performance of the IMD is then reported.

US Patent:

7561911, Jul 14, 2009

Filed:

Apr 16, 2004

Appl. No.:

10/826512

Inventors:

Jian Cao - Shoreview MN, US
Jeffrey M. Gillberg - Coon Rapids MN, US

Assignee:

Medtronic, Inc. - Minneapolis MN

International Classification:

A61B 5/04

US Classification:

600509

Abstract:

A method and device for generating a template that includes determining whether there are consecutive events of a plurality of sensed events having first characteristics, and if a predetermined number of events of the plurality of sensed events subsequent to the consecutive events are identified as first selected events having second characteristics, the template is then generated from the first selected events.

US Patent:

7640054, Dec 29, 2009

Filed:

May 26, 2006

Appl. No.:

11/420521

Inventors:

Lev A. Koyrakh - Plymouth MN, US
Eugene Davydov - Stanford CA, US
Jeffrey M. Gillberg - Coon Rapids MN, US
Jian Cao - Shoreview MN, US

Assignee:

Medtronic, Inc. - Minneapolis MN

International Classification:

A61B 5/0468
A61B 5/0472

US Classification:

600515

Abstract:

A method of generating a template in an implantable medical device for implantation within a patient, and a processor readable medium for performing the method, that includes generating a template from collected events corresponding to the patient, delaying the generation of the template for a first predetermined time period in response to the template not being generated within a predetermined number of collected events, determining whether the template is valid, and monitoring the template to determine whether the template is an accurate representation of the patient.