Abstract:
An implantable electrode type lead assembly 10 of the flexible type which is particularly adapted for implantation in the cardiac tissue for applications such as use with a pacemaker. The lead assembly has an electrode head 40 which includes a fixation spiral for implantation into tissue. The spiral or rotation action of the electrode head 40 is controlled by means of an elongated torsionally wound electrical coil conductor 14, the coil extending through the lead from the proximal to the distal end thereof and carried within a silicone tube 24 which is co-extensive therewith, the tube having been especially treated to modify the slip characteristics of the internal diameter (ID) thereof for high efficiency torque transfer.
Abstract:
An introducer catheter used to deliver an endocardial cardiac electrode has a stylet lumen which collapses upon removal of the stylet to allow for more clearance for the lead and connector to pass when the catheter is removed after lead placement. The collapsible stylet lumen permits the introducer catheter size to be reduced to 8 or 9 French and provide for passage of a 4 French lead.
Abstract:
A medical electrical lead (10) including an inflatable member (12) at a distal tip section, and a system of use, are disclosed. The inflation member is adapted to engage the walls of a cardiac vein or coronary artery to occlude the vessel. According to one aspect of the invention, the inflation member is formed of a bio-absorbable material. In another embodiment, the inflation member is a micro-porous material. The lead of the current invention may include a port located distal to the inflation member is in the inflated state. This allows a fluoroscopic image of a patient's vascular system to be obtained while the lead is in place within a vessel. A perfusion lumen may be provided to allow a partial flow of blood to continue around the inflation member (18) when the inflation member is occluding a vessel. In one embodiment, lead is provided with a lumen for receiving a stiffening menber such as a stylet (64) to aid in lead is placement. According to one method of using the current invention, inflation member may be inflated after the lead is placed at a desired implant site to provide a temporary fixation mechanism during withdrawal of the stiffening member and/or a guide catheter or sheath used to place the lead at the implant site. This temporary fixation mechanism may also be employed to retain a desired lead location while thresholds are obtains. The inflation member may be retained in an inflated state for a longer predetermined period of time until tissue in-growth begins to occur around the lead.
Abstract:
An introducer catheter used to deliver an endocardial cardiac electrode has a stylet lumen which collapses upon removal of the stylet to allow for more clearance for the lead and connector to pass when the catheter is removed after lead placement. The collapsible stylet lumen permits the introducer catheter size to be reduced to 8 or 9 French and provide for passage of a 4 French lead.
Abstract:
An implantable medical lead configured for active fixation in the vasculature of a patient includes an elongated lead body having a central lumen and a distal tip. Disposed within the central lumen are a fixation helix and an elongated member, such as a lead coil, coupled to the fixation helix. The elongated member is adapted to rotate the fixation helix, thereby causing it to advance or retract within the central lumen of the lead body. The lead body includes a window along a portion of its length through which the fixation helix may be affixed to a blood vessel of the patient's vasculature.
Abstract:
Methods and endocardial screw-in leads for enabling provision of electrical stimulation to the heart, particularly the His Bundle in the intraventricular septal wall. An endocardial screw-in lead having a distal end coupled to a retractable fixation helix wherein a distal portion of the fixation helix extends beyond the lead distal end when the fixation helix is fully retracted or partially extended is positioned in proximity to the His Bundle in the septal wall. The lead body is rotated to attach the distal portion of the fixation helix into the septal wall. The fixation helix is rotated with respect to the lead body to fully extend the fixation helix so that a portion of the fixation helix is in proximity to the His Bundle, enabling provision of electrical stimulation to the His Bundle and/or to sense electrical signals of the heart traversing the His Bundle through the fixation helix.
Abstract:
Methods and endocardial screw-in leads for enabling provision of electrical stimulation to the heart, particularly the His Bundle in the intraventricular septal wall. An endocardial screw-in lead having a distal end coupled to a retractable fixation helix wherein a distal portion of the fixation helix extends beyond the lead distal end when the fixation helix is fully retracted or partially extended is positioned in proximity to the His Bundle in the septal wall. The lead body is rotated to attach the distal portion of the fixation helix into the septal wall. The fixation helix is rotated with respect to the lead body to fully extend the fixation helix so that a portion of the fixation helix is in proximity to the His Bundle, enabling provision of electrical stimulation to the His Bundle and/or to sense electrical signals of the heart traversing the His Bundle through the fixation helix.
Abstract:
A medical electrical lead (10) including an inflatable member (12) at a distal tip section, and a system of use, are disclosed. The inflation member is adapted to engage the walls of a cardiac vein or coronary artery to occlude the vessel. According to one aspect of the invention, the inflation member is formed of a bio-absorbable material. In another embodiment, the inflation member is a micro-porous material. The lead of the current invention may include a port located distal to the inflation member is in the inflated state. This allows a fluoroscopic image of a patient's vascular system to be obtained while the lead is in place within a vessel. A perfusion lumen may be provided to allow a partial flow of blood to continue around the inflation member (18) when the inflation member is occluding a vessel. In one embodiment, lead is provided with a lumen for receiving a stiffening menber such as a stylet (64) to aid in lead is placement. According to one method of using the current invention, inflation member may be inflated after the lead is placed at a desired implant site to provide a temporary fixation mechanism during withdrawal of the stiffening member and/or a guide catheter or sheath used to place the lead at the implant site. This temporary fixation mechanism may also be employed to retain a desired lead location while thresholds are obtains. The inflation member may be retained in an inflated state for a longer predetermined period of time until tissue in-growth begins to occur around the lead.