摘要:
A cardioversion/defibrillation device includes a lead catheter housing, two electrically independent conductors, and a pair of resilient helically coiled electrodes, one electrode coupled to each of the conductors. The distal ends of the electrodes are contained within an insulative, resilient coupling sleeve, such that the electrodes and sleeve form a loop when in the relaxed state, with the electrodes electrically isolated from one another. To facilitate body insertion and delivery to the electrode placement site, the electrodes and coupling sleeve are loaded into a delivery cannula, which elastically deforms the electrodes and sleeve into an elongate, narrow delivery configuration. Upon release from the delivery device, these components resiliently return to the loop configuration. If desired, an inextensible filament secured to the coupling sleeve is pulled proximally after deployment to selectively reconfigure the electrodes into two loops. Another modification involves several linear electrode branch segments, coupled to each electrode and projected inwardly of the loop or loops formed by the electrodes.
摘要:
An implantable defibrillation electrode including a conductive distal end portion and a non-conductive proximal end portion is provided with at least a major portion of the length of the distal end portion having a pre-configured shape and being resiliently deformable into a generally straight condition. The distal end portion includes distal and proximal ends and at least one of those ends is hollow and has hook structure shiftably supported therein for movement longitudinally thereof from a retracted position at least substantially contained within the hollow end and an extended position at least substantially fully outwardly projected from the hollow end. Spring structure is provided for yieldingly biasing the hook structure from the extended position toward the retracted position and axial thrust developing structure is slidingly telescoped through the proximal end portion and operatively associated with the hook structure for exerting an axial thrust thereon from the terminal end of the proximal end portion in order to effect shifting of the hook structure from the retracted position to the extended position.
摘要:
An implantable defibrillation electrode including a conductive distal end portion and a non-conductive proximal end portion is provided with at least a major portion of the length of the distal end portion having a pre-configured shape and being resiliently deformable into a generally straight condition. The distal end portion includes distal and proximal ends and at least one of those ends is hollow and has hook structure shiftably supported therein for movement longitudinally thereof from a retracted position at least substantially contained within the hollow end and an extended position at least substantially fully outwardly projected from the hollow end. Spring structure is provided for yieldingly biasing the hook structure from the extended position toward the retracted position and axial thrust developing structure is slidingly telescoped through the proximal end portion and operatively associated with the hook structure for exerting an axial thrust thereon from the terminal end of the proximal end portion in order to effect shifting of the hook structure from the retracted position to the extended position.
摘要:
An implantable defibrillation electrode including a conductive distal end portion and a non-conductive proximal end portion is provided with at least a major portion of the length of the distal end portion having a preconfigured shape and being resiliently deformable into a generally straight condition. The distal end portion includes distal and proximal ends and at least one of those ends is hollow and has hook structure shiftably supported therein for movement longitudinally thereof from a retracted position at least substantially contained within the hollow end and an extended position at least substantially fully outwardly projected from the hollow end. Spring structure is provided for yieldingly biasing the hook structure from the extended position toward the retracted position and axial thrust developing structure is slidingly telescoped through the proximal end portion and operatively associated with the hook structure for exerting an axial thrust thereon from the terminal end of the proximal end portion in order to effect shifting of the hook structure from the retracted position to the extended position.
摘要:
A system and method for stimulating a human heart including a sensing module coupled through a lead to an electrode associated with a tissue of the human heart for sensing electrical activity of the heart. A controller module may be coupled to the sensing module. The controller module may select between a temporary stimulation therapy and a chronic stimulation therapy. Also included is a therapy module coupled to the controller, the therapy module communicating a plurality of anodic pulses to the heart through the lead when providing the temporary stimulation therapy. The amplitude, frequency, and duration of the anodic pulses may be varied, and biphasic pacing may also be used. The electrode may be a drug-eluting electrode for delivery of a drug. After an event occurs, the controller module may transition to the chronic stimulation therapy that may include cathodic stimulation.
摘要:
Systems and methods for evaluating a patient condition using autonomic balance information involve providing an implantable cardiac device that acquires a cardiac waveform from a patient. One or more characteristics associated with autonomic balance of the patient are detected and used to evaluate a patient condition, such as sleep onset, sleep stage, cardiac vulnerability over a predetermined duration, and sleep disordered breathing. Patient activity levels may be sensed and used to evaluate the patient's condition, such as for determining a level of systemic stress. Characteristics associated with the autonomic balance include calculating an LF/HF ratio waveform and/or determining one or more morphological features of the LF/HF ratio waveform. Coordination with a patient-external device may facilitate transmission of information about one or more of the cardiac waveform, the one or more characteristics associated with the autonomic balance, and a marked cardiac waveform.
摘要:
Methods and systems for providing an implantable medical device with a controlled diagnostic function adapted to convert from a monitoring mode to a therapeutic mode upon sensing an actionable cardiovascular event are disclosed. A preferred embodiment uses an interactive control module to selectively control a plurality of gated circuits that turn the sensing, therapeutic and communications functions of the device on and off to conserve battery power and extend the life of the device. Some embodiments of a system disclosed herein also can be configured as a component of an Advanced Patient Management System that helps better monitor, predict and manage chronic diseases.
摘要:
Intravenous cardiac leads having at least one electrode intended to be implanted within the coronary artery are disclosed. Also disclosed are structures and techniques for advancing such leads through the atrium and coronary sinus into the coronary veins overlaying the left ventricle.
摘要:
Systems and methods for correlating biometric trends with a related temporal event are disclosed. A preferred embodiment utilizes an implantable medical device comprising at least one sensor in electronic communication with a patient management system adapted to temporally analyze and correlate biometric data. Some embodiments of a system disclosed herein also can be configured as an Advanced Patient Management system that helps better monitor, predict and manage chronic diseases.
摘要:
Body-implantable leads with open, unbacked (uninsulated) electrode structures having electrical discharge surfaces formed by conductive elements, such as mesh and braid, and preferably coils. The electrode structures can be classified by pattern: (1) loops, (2) linear arrays and (3) radial arrays. The electrodes are located on or near the epicardial surface of the right and left heart.