公开(公告)号：EP1028779A1

公开(公告)日：2000-08-23

申请号：EP98955010.8

申请日：1998-10-20

申请人： INTERMEDICS INC.

发明人： ARMSTRONG, Randolph, K. ,  COOK, Douglas, J. ,  VANDEGRIFF, Joseph, W.

IPC分类号： A61N1/365

CPC分类号： A61N1/365 ,  A61N1/3704 ,  A61N1/3962

摘要： An implantable device (10) for providing pacing and defibrillating stimuli to a heart, comprises: a power source (70), at least one electrode (60) electrically connected to said power source, a sensor (40) capable of providing data that can be used to determine a physiological pacing demand, and a control device (12). The control device (12) controls the application of electrical stimuli to the heart. The control device (12) calculates (106) an adjusted pacing interval based on said demand, calculates (112) an adjusted ventricular pace refractory period (VPRPcurrent) that is a function of said pacing interval, and calculates a T-wave monitoring window (108, 110). The end time, and optionally the start time also, of the T-wave window is a function of the pacing interval. The control device is also capable of adjusting the sensitivity of an amplifier (40) based on signals received during the T-wave window.

公开(公告)号：EP1011799A1

公开(公告)日：2000-06-28

申请号：EP97913941.7

申请日：1997-10-31

申请人： INTERMEDICS INC.

发明人： ROUTH, Andre, G. ,  DENO, Don, C.

IPC分类号： A61N1/37

CPC分类号： A61N1/3712

摘要： A pacemaker (100) is disclosed that includes circuitry (175) for monitoring the current and/or voltage delivered to the heart during a pacing pulse. A microprocessor (225) connects to the monitoring circuitry and analyzes the current (and/or voltage) to determine when capture occurs. When capture occurs, the microprocessor terminates the pacing pulse to save energy. Conversely, if capture does not occur within a predetermined maximum time period, or if the pacing pulse amplitude falls below a predetermined threshold value, the processor immediately causes a safety pulse to fire to insure a regular beating of the heart. By monitoring the current and/or voltage delivered, and by permitting the pacing pulse width to be variable, the pacemaker of the present invention can closely track the pacing threshold of the patient with a minimum expenditure of energy.

公开(公告)号：EP0999869A1

公开(公告)日：2000-05-17

申请号：EP98935982.3

申请日：1998-07-21

申请人： INTERMEDICS INC.

发明人： SPEHR, Paul, R.

IPC分类号： A61N1/05

CPC分类号： A61N1/057 ,  A61N1/056

摘要： A lead assembly (10) adapted for endocardial fixation to a human heart is provided. The lead assembly (10) includes a lead body (12) that has a proximal end (14) provided with a connector (16) for electrical connection to a cardiac stimulator. The cardiac stimulator may be a pacemaker, a cardioverter/defibrillator, or a sensing instrument. The distal end (20) of the lead body is connected to a tubular electrode housing (22). The lead body (12) consists of a noncoiled conductor cable (24) surrounded by a coextensive insulating sleeve. In contrast to conventional leads, the lead body of the present invention does not require coiled conductor wires or an internal lumen. Manipulation of the lead body is via an external guide tube. Lead body diameters of 0.25 mm or smaller are possible.

公开(公告)号：EP0935483A1

公开(公告)日：1999-08-18

申请号：EP97944312.0

申请日：1997-09-16

申请人： SULZER INTERMEDICS INC.

发明人： NEDUNGADI, Ashok, P. ,  WANG, Xintao

IPC分类号： A61N1

CPC分类号： A61N1/37211 ,  A61N1/3787

摘要： An implantable device with a data communication system for control of transcutaneous energy transmission to the implantable medical device, the implantable medical device having rechargeable batteries and a single coil that is employed both for energy transmission and data telemetry. Control circuitry in the implantable device senses battery voltage and current through the battery, encodes those values by use of a mulitplexer, and transmits the sened and encoded values through the coil to an external energy transmission device. The external device includes a coil that is electromagnetically coupled to the coil in the implantable device for receiving the encoded signals and for transmitting energy to the implantable device. The external device decodes the transmitted values and transmits those to a controller for controlling energy transmission.

公开(公告)号：EP0929345A1

公开(公告)日：1999-07-21

申请号：EP97938588.0

申请日：1997-08-25

申请人： SULZER INTERMEDICS INC.

发明人： PAUL, Patrick, J. ,  PRUTCHI, David ,  DENO, Curtis, D.

IPC分类号： A61N1

CPC分类号： A61N1/36521

摘要： A method and apparatus for monitoring balanced biphasic current pulses used for measuring impedance in cardiac stimulators involves detecting imbalances between the pulses of opposite polarity. Such imbalances are potentially harmful to cardiac stimulator users. By converting the two different pulse phases into potentials, a determination can be made as to whether adequately balanced pulses are being generated. If an imbalance is detected, corrective action can be taken quickly enough to avoid harmful effects to the stimulator user.

公开(公告)号：EP0834146B1

公开(公告)日：1999-05-06

申请号：EP96920604.4

申请日：1996-05-31

申请人： SULZER INTERMEDICS INC.

发明人： WOODON, Drury, L. III

IPC分类号： G06F19/00

CPC分类号： A61B5/00 ,  A61B5/7232

公开(公告)号：EP0901397A1

公开(公告)日：1999-03-17

申请号：EP97925587.0

申请日：1997-05-15

申请人： SULZER INTERMEDICS INC.

发明人： VERBOVEN-NELISSEN, Yves

IPC分类号： A61N1

CPC分类号： A61N1/3627 ,  A61N1/368

摘要： A method and apparatus for determining the origin of a cardiac signal in the heart of a patient. A cardiac stimulator includes a multiple-chamber electrode arrangement having at least two electrodes positioned to sense and/or pace different chambers of the heart. The electrodes switch from a bipolar configuration to an unipolar configuration in order to verify the point of origin for the cardiac signal and in order to determine whether propagation of the cardiac signal occurs. The apparatus allows simultaneous and timed pacing of left and right chambers.

公开(公告)号：EP0680362B1

公开(公告)日：1998-11-11

申请号：EP92905225.6

申请日：1992-01-21

申请人： SULZER INTERMEDICS INC.

发明人： SCHROEPPEL, Edward, A.

IPC分类号： A61N1/05

CPC分类号： A61N1/056 ,  A61N1/36514

公开(公告)号：EP0868205A1

公开(公告)日：1998-10-07

申请号：EP96945410.0

申请日：1996-12-17

申请人： SULZER INTERMEDICS INC.

发明人： SCHROEPPEL, Edward, A.

IPC分类号： A61N1

CPC分类号： A61N1/3712 ,  A61N1/3714

摘要： A cardiac pacemaker capable of verifying whether an atrium of the heart has been captured by an atrial cardiac stimulation pulse. An atrial signal is sensed via an electrode located in the atrium during a period of time from before delivery of the stimulation pulse to after delivery of the stimulation pulse. The sensed signal is analyzed by detecting whether a P-wave occurred prior to delivery of the cardiac stimulation pulse such that stimulation pulse would have been delivered within a refractory period. If a P-wave did not occur, the slope of the sensed waveform signal is determined within a selected interval of time beginning at a selected time after the time of delivery of the stimulation pulse. A capture status signal is generated that indicates non-capture, if a P-wave was detected, or capture, if a P-wave component was not detected and the determined slope of the sensed waveform signal surpasses a pre-selected slope threshold demarcating capture from non-capture.

公开(公告)号：EP0866727A1

公开(公告)日：1998-09-30

申请号：EP96941326.0

申请日：1996-11-14

申请人： INTERMEDICS INC.

发明人： ALT, Eckhard, U. ,  STOTTS, Lawrence, J.

IPC分类号： A61N1

CPC分类号： A61N1/36542

摘要： A variable rate cardiac pacemaker having an accelerometer for setting a pacing rate characterized by a ratioing circuit for determining a ratio of positive accelerations to negative accelerations and setting the pacing rate in response to the ratio. The ratio may be determined from the duration of the accelerometer signal above and below a reference, or from an integration of that value. The reference may be electrical zero or some other value such as a rolling average. The positive and negative accelerations may be weighted to favor response to either positive or negative accelerations. The integrated values may also be squared or otherwise enhanced by a factor to increase responsiveness.