摘要:
A helical fixation element of an implantable medical lead. The fixation element has at least one blood drainage channel running along at least a tissue-penetrating portion of the helix windings of the fixation element. The channel guides, during penetration and anchoring of the fixation element and the lead in a tissue, blood leaking from the tissue away from the vicinity of the fixation element, thereby reducing the size of a fibrin clot formed around the fixation element. The capture threshold for stimulating the tissue is therefore reduced.
摘要:
A medical implantable lead, which is adapted to be attached with a distal end to tissue inside a human or animal body, has a flexible sleeve in the distal end that protrudes a distance in an axial direction from the rest of the lead. When in a desired position, a force acting in an axial direction on the flexible sleeve will bring the sleeve to be compressed in the axial direction such that the surface area of the distal end will be enlarged. The flexible sleeve is formed with axial slots from an unbroken ring segment in an outermost distal edge of the sleeve and a distance in the proximal direction such that flexible segments are formed in the sleeve, wherein a force acting in an axial direction on the flexible sleeve will bring the sleeve to be compressed in the axial direction by folding outwards of the flexible segments.
摘要:
A medical implantable lead of the type being adapted to be implanted into a human or animal body and attached with a distal end to an organ inside the body, has a helix of a helical wire in the distal end which is adapted to be screwed into the organ. In addition to the first helix, the lead also has a second helix of a helical wire, the second helix having the same diameter, the same pitch and being intertwined with the helical wire of the first helix and which, upon rotation of the first helix, will be rotated and screwed into the tissue. The first helix is electrically non-conductive whereas the second helix is electrically conductive. In a method for attaching a medical implantable lead to an organ inside a human or animal body, such a medical lead is employed and fixed to tissue in vivo.
摘要:
An implantable medical lead has a distal lead portion with a tubular header and a fixation helix provided in a lumen of the tubular header. The fixation helix is connected to a shaft attached to a conductor coil. A tubular coupling is connected to the tubular header and is coaxially arranged relative the shaft, with the shaft in its lumen. Rotation of the conductor coil causes rotation of the shaft and the fixation helix and longitudinal movement of the fixation helix out of the implantable medical lead by a rotation-to-translation transforming element. A friction device is arranged between the shaft and the tubular coupling or between the tubular header to oppose rotation of the shaft relative the tubular header and the tubular coupling.
摘要:
An assembly includes a medical implantable lead adapted to be attached with a distal end of the lead to an organ inside a human or animal body, the medical implantable lead being formed with an inner lumen extending along essentially the entire length of the lead. The assembly also includes a support core that has a desirable stiffness and a suitably cross sectional dimension such that it is insertable into the lumen (7) in order to increase the stiffness of the lead along its length during its working life when being implanted into a body. A method for implanting a medical implantable lead into a human or animal body makes use of such an assembly.
摘要:
A helical fixation element of an implantable medical lead. The fixation element has at least one blood drainage channel running along at least a tissue-penetrating portion of the helix windings of the fixation element. The channel guides, during penetration and anchoring of the fixation element and the lead in a tissue, blood leaking from the tissue away from the vicinity of the fixation element, thereby reducing the size of a fibrin clot formed around the fixation element. The capture threshold for stimulating the tissue is therefore reduced.
摘要:
For attaching a cardiac stimulator lead at a desired position inside a heart, the stimulator lead having a flexible tube from which a helix is extendible at a distal end thereof by a screw rotating motion and having a proximal end interconnected with an operating member, a tool has a flexible portion wire with an engagement formation at a distal end thereof that mates with a complimentary engagement formation at a proximal end of the operating member. The tool has a handle containing an internal cavity, with a proximal portion of the torsion wire being rotationally rotated by the handle in the internal cavity, and a resilient yoke is formed in the internal cavity, with at least a part of the yoke engaging grooves and ridges in a circumferential boundary surface of the internal cavity.
摘要:
An implantable medical lead has a header assembly having an inner header channel and a radial aperture. An inner lead assembly includes a helical active fixation element connected to an inner conductor. The inner lead assembly is coaxially housed within the header channel. A post is inserted into the radial aperture after insertion of the inner lead assembly into the channel. The post projects radially inwardly into the header channel to become interposed between adjacent turns of the helical fixation element. At this position the post is able to transform a rotation of the helical fixation element to a longitudinal movement of the fixation element.
摘要:
An assembly includes a medical implantable lead adapted to be attached with a distal end of the lead to an organ inside a human or animal body, the medical implantable lead being formed with an inner lumen extending along essentially the entire length of the lead. The assembly also includes a support core that has a desirable stiffness and a suitably cross sectional dimension such that it is insertable into the lumen in order to increase the stiffness of the lead along its length during its working life when being implanted into a body. A method for implanting a medical implantable lead into a human or animal body makes use of such an assembly.
摘要:
A medical implantable lead, which is adapted to be attached with a distal end to tissue inside a human or animal body, has a distal end that is variable in size between an introducing state, when the distal end has a minimum surface area, and a mounting state when the surface area of the distal end is enlarged in relation to its minimum surface area. For this purpose, the distal end of the medical implantable lead has several pivoting segments, each being pivotally hinged about a pivot axis directed substantially tangentially in relation to the lead, with each pivoting segment being pivotable about the pivot axis between an introducing state in which each pivoting segment is rotated to a position in parallel or in a small angle to the longitudinal axis of the lead, and a mounting state in which each pivoting segment is rotated to a position essentially perpendicular to the longitudinal axis of the lead.