Patents by Inventor Veerichetty Kadhiresan

Veerichetty Kadhiresan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6415183
    Abstract: A diaphragmatic pacing system and method. The method includes monitoring a signal representing a patient's respiratory activity, and delivering an electric stimulus from a lead to the phrenic nerve when the signal indicates that the respiratory activity is below a predetermined level. Physiological state information, such as the respiration activity or minute ventilation, is sensed using the implanted lead and the method delivers an output based on such input. Another embodiment provides concurrent sensing and pacing of heart and diaphragm using a single implanted pulse generator. The implantable system includes at least one lead and a signal processing circuit coupled to the lead. The signal processing circuit processes a signal representative of a respiratory activity. A controller coupled to the signal processing circuit analyzes the signal and when the signal indicates a need for respiratory therapy the controller outputs a controller signal.
    Type: Grant
    Filed: December 9, 1999
    Date of Patent: July 2, 2002
    Assignee: Cardiac Pacemakers, Inc.
    Inventors: Avram Scheiner, Veerichetty Kadhiresan
  • Publication number: 20020058877
    Abstract: A method and apparatus for determining the baroreflex sensitivity in a chronic heart failure patient and a method for chronic heart therapy evaluation. The method including providing a series of pacing stimuli to the heart of a chronic heart failure patient and measuring the change in pulse pressure and the change in cycle length incident to each pacing series. The changes being plotted to produce a line indicative of baroreflex sensitivity. The apparatus including a pacemaker having sensors for monitoring both cycle length and pulse pressure wherein the sensors may be integral or separate from the pacemaker. The method for evaluating chronic heart failure therapies including administering a series of therapies and evaluating each therapy based on the resultant increase of the patient's baroreflex sensitivity.
    Type: Application
    Filed: October 25, 2001
    Publication date: May 16, 2002
    Applicant: Cardiac Pacemakers, Inc.
    Inventors: Lawrence S. Baumann, Veerichetty A. Kadhiresan
  • Patent number: 6371922
    Abstract: A method and apparatus for determining the baroreflex sensitivity in a chronic heart failure patient and a method for chronic heart therapy evaluation. The method including providing a series of pacing stimuli to the heart of a chronic heart failure patient and measuring the change in pulse pressure and the change in cycle length incident to each pacing series. The changes being plotted to produce a line indicative of baroreflex sensitivity. The apparatus including a pacemaker having sensors for monitoring both cycle length and pulse pressure wherein the sensors may be integral or separate from the pacemaker. The method for evaluating chronic heart failure therapies including administering a series of therapies and evaluating each therapy based on the resultant increase of the patient's baroreflex sensitivity.
    Type: Grant
    Filed: April 7, 2000
    Date of Patent: April 16, 2002
    Assignee: Cardiac Pacemakers, Inc.
    Inventors: Lawrence S. Baumann, Veerichetty A. Kadhiresan
  • Publication number: 20010037069
    Abstract: Based upon patient studies indices a high degree of correlation was found between HRV and VO2max, i.e., the patient's exercise capacity. Based on this finding, a pacing therapy optimization protocol for treating patients with CHF has been devised. The protocol involves first pacing the patient's heart with a pacemaker programmed to operate in a first mode for a predetermined time period and then collecting electrogram data from which a HRV index is derived. The mode is then changed and the steps repeated until all possible modes have been utilized. At that time, a determination is made as to which of the modes is associated with the largest HRV index and the pacemaker is then programmed to function in that mode. Alternatively, the method of the present invention can be applied to changes in drug therapy instead of or in combination with pacing therapy. By the plotting the HRV index computed in the manner described, the efficacy of a change in therapy on patient exercise capacity can be assessed.
    Type: Application
    Filed: June 25, 2001
    Publication date: November 1, 2001
    Applicant: Cardiac Pacemakers, Inc.
    Inventors: Gerrard M. Carlson, Veerichetty A. Kadhiresan, Julio C. Spinelli
  • Patent number: 6301499
    Abstract: Based upon patient studies indices a high degree of correlation was found between HRV and VO2max, i.e., the patient's exercise capacity. Based on this finding, a pacing therapy optimization protocol for treating patients with CHF has been devised. The protocol involves first pacing the patient's heart with a pacemaker programmed to operate in a first mode for a predetermined time period and then collecting electrogram data from which a HRV index is derived. The mode is then changed and the steps repeated until all possible modes have been utilized. At that time, a determination is made as to which of the modes is associated with the largest HRV index and the pacemaker is then programmed to function in that mode. Alternatively, the method of the present invention can be applied to changes in drug therapy instead of or in combination with pacing therapy. By the plotting the HRV index computed in the manner described, the efficacy of a change in therapy on patient exercise capacity can be assessed.
    Type: Grant
    Filed: October 18, 1999
    Date of Patent: October 9, 2001
    Assignee: Cardiac Pacemakers, Inc.
    Inventors: Gerrard M. Carlson, Veerichetty A. Kadhiresan, Julio C. Spinelli
  • Patent number: 6026320
    Abstract: Based upon patient studies indices a high degree of correlation was found between HRV and VO2.sub.max, i.e., the patient's exercise capacity. Based on this finding, a pacing therapy optimization protocol for treating patients with CHF has been devised. The protocol involves first pacing the patient's heart with a pacemaker programmed to operate in a first mode for a predetermined time period and then collecting electrogram data from which a HRV index is derived. The mode is then changed and the steps repeated until all possible modes have been utilized. At that time, a determination is made as to which of the modes is associated with the largest HRV index and the pacemaker is then programmed to function in that mode. Alternatively, the method of the present invention can be applied to changes in drug therapy instead of or in combination with pacing therapy.
    Type: Grant
    Filed: June 8, 1998
    Date of Patent: February 15, 2000
    Assignee: Cardiac Pacemakers, Inc.
    Inventors: Gerrard M. Carlson, Veerichetty A. Kadhiresan, Julio C. Spinelli
  • Patent number: 5931858
    Abstract: An implantable electronic circuit for monitoring a patient's aerobic capacity includes an accelerometer for detecting the onset and termination of a period of exercise and a means for measuring the patient's minute volume. By computing the time interval from the cessation of exercise to the point where the patient's minute volume reaches a predetermined value at or near an at-rest value thereof, a measure of aerobic capacity relating to a patient's physical fitness can be determined.
    Type: Grant
    Filed: January 12, 1998
    Date of Patent: August 3, 1999
    Assignee: Cardiac Pacemakers, Inc.
    Inventors: Veerichetty A. Kadhiresan, Arthur L. Olive, Bruce R. Jones
  • Patent number: 5855594
    Abstract: A cardiac pacing and sensing system includes a body implantable unit for generating tissue stimulation pulses and manipulating information based on sensed signals, and a catheter for transmitting pulses from the unit to a pacing electrode adjacent myocardial tissue. The unit incorporates circuitry for generating response values, one associated with each stimulation pulse, based on a predetermined characteristic or parameter of the signals evoked by the pulses. To evaluate the efficacy of the parameter in distinguishing capture versus non-capture, the stimulation pulses are generated according to a protocol of high energy pulses guaranteed to effect capture interspersed with low energy pulses guaranteed not to effect capture. Data, accumulated and sorted into separate "capture" and "non-capture" sets, provides respective capture and non-capture composite values.
    Type: Grant
    Filed: August 8, 1997
    Date of Patent: January 5, 1999
    Assignee: Cardiac Pacemakers, Inc.
    Inventors: Arthur L. Olive, Brian D. Pederson, Veerichetty A. Kadhiresan, Donald L. Villalta