摘要:
A medical device that includes a lead having a lead body extending from a proximal end to a distal end, and a housing having a connector block for receiving the proximal end of the lead body. A fixation mechanism is positioned proximal to an electrode coil located at the distal end of the lead body, and a fixation member or a plurality of fixation members extend from the fixation mechanism from a fixation member proximal end to a fixation member distal end. The fixation members are advanceable from a first position corresponding to the fixation member distal end being positioned along the lead during subcutaneous placement of the lead, to a second position corresponding to the fixation member distal end being positioned away from the lead to fixedly engage the lead at a target site.
摘要:
An implantable medical device is provided for sensing cardiac activity within a patient's body. The device comprises a canister, control circuitry disposed within the canister, and a lead assembly extending from the canister. At least one sense electrode is coupled to the circuitry and disposed on the lead assembly for sensing cardiac activity. At least one spacer is coupled between the lead assembly and the canister for maintaining a minimum predetermined distance between the at least one sense electrode and the canister.
摘要:
A medical electrical lead and introducer system. The lead is a single pass, dual chamber lead, which features in one embodiment an atrial tine. The introducer system is particularly designed for introduction of single pass, dual chamber lead which has an atrial tine. The introducer system facilitates the introduction of a such lead into a patient's heart while safeguarding the tine from damage due to kinking during lead positioning. The lead is a single pass lead which features an atrial tine while the introducer system is particularly designed for introduction of a such lead into a patient's heart so as to safeguard the tine from damage due to kinking during lead positioning. The lead is designed so as to electrically couple both the atrium and the ventricular chambers of the heart. The lead generally features several lengths each having differing stiffness as well as a pre-formed bend. The lead also features a atrial tine having an electrode at the tip. Due to the relatively fragile as well as difficult to maneuver lead, an introducer system is also disclosed. The introducer system is particularly designed to introduce such a lead. In use a removable tubing split element surrounds the atrial tine area of the lead while it is disposed through the introducer sheath, the split element both blocks the tine from lateral movement and fills up the space between the lead body and the introducer, thereby preventing blood leakage through the introducer. The element also has a longitudinal split for receiving the atrial tine while holding it against transverse movement when the lead is being repositioned. After optimal positioning of the lead, the tubing split element is withdrawn, and then the introducer is withdrawn. The tubing split element is a generally cylindrical piece of TEFLON, here called a tube split element, or just a “tube split”, is positioned around the lead body in the atrial tine area. The tube split element has a thickness which substantially fills the radial gap between the smaller diameter lead body and the introducer inner cylindrical wall, and has a longitudinal separation, or split, which accommodates the atrial tine, thereby permitting the tine to extend longitudinally but not transversely. The tubing split element is preferably mounted on the lead at the time of lead assembly. It has a length sufficient to extend proximally out of the introducer so that it can be withdrawn, and has a longitudinal tear line whereby the element can be separated and removed from the lead after final positioning of the lead.
摘要:
A medical electrode delivery tool includes a distal portion coupled to an elongate shaft. The distal portion includes a generally ellipsoidal segment. The ellipsoidal segment includes a concave surface forming a cavity having an opening facing in a direction away from a longitudinal axis of the shaft and a convex surface overlying the concave surface and tapering to a distal end of the ellipsoidal segment.
摘要:
A medical electrical system includes a device including a connector port and an external electrically active surface and an auxiliary lead including a supplemental electrode and a connector end. The external electrically active surface of the device is adapted to receive the auxiliary lead connector end, thereby electrically coupling the supplemental electrode to the device via contact between the connector end and the external surface.
摘要:
A medical device that includes a lead having a lead body extending from a proximal end to a distal end, and a housing having a connector block for receiving the proximal end of the lead body. A fixation mechanism is positioned proximal to an electrode coil located at the distal end of the lead body, and includes a locking sleeve and a mating portion positioned along the lead body proximal to the electrode. The fixation mechanism is capable of being advance from a first state corresponding to a first inner diameter of the locking sleeve and a second state corresponding to a second inner diameter of the locking sleeve greater than the first inner diameter to fixed position the electrode at a target site.
摘要:
An implantable medical device and method are provided for determining if a patient is in a substantially horizontal position and delaying a programmed cardioversion/defibrillation shock therapy in response to determining the patient is in a substantially horizontal position. In various embodiments, the shock therapy may be delayed by adjusting tachycardia detection criteria or scheduling the shock therapy after a maximum tachycardia episode duration.
摘要:
Methods of implanting at least one lead for a cardio defibrillator using body surface potential (BSP) electrodes are disclosed. The methods may include installing defibrillation electrodes in a patient, attaching at least three BSP electrodes to the patient's skin, creating a potential difference between the defibrillation electrodes, and measuring the resulting body surface potential at the three BSP electrodes. Once the resulting BSP is measured, the methods may include determining the amplitude of a resultant vector formed by the measured BSP potential differences. The location of a defibrillation electrode may then be manipulated to increase the amplitude of the resultant vector formed by the measured BSP potential differences.
摘要:
A medical device that includes a lead having a lead body extending from a proximal end to a distal end, and a housing having a connector block for receiving the proximal end of the lead body. A fixation mechanism is positioned proximal to an electrode coil located at the distal end of the lead body, and includes a locking sleeve and a mating portion positioned along the lead body proximal to the electrode. The fixation mechanism is capable of being advance from a first state corresponding to a first inner diameter of the locking sleeve and a second state corresponding to a second inner diameter of the locking sleeve greater than the first inner diameter to fixed position the electrode at a target site.
摘要:
The present invention provides systems, methods, components and medical devices for defibrillating a volume of excitable myocardial tissue. In one aspect, the invention delivers therapy via a pair of electrodes spaced from myocardial tissue with a first electrode disposed in a precordial location and spaced from myocardial tissue and a second electrode disposed in a non-precordial location. Another form of the invention includes methods of delivering cardioversion, defibrillation and/or cardiac pacing therapy by sensing cardiac events with at least a pair of electrodes located in one of a submuscular and a subcutaneous position. In this form of the invention the pair of electrodes are spaced from excitable heart tissue of the subject and cardiac therapy pulses are delivered via at least a pair of electrodes at a sufficient energy level to capture at least one ventricular chamber of the subject.