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Arrangement for implanting a miniaturized cardiac lead having a fixation helix
| Details |
Inventors: Seifert, Kevin R.; Lee, Travis S.; Foerster, Laurie D.;
Assignee: Medtronic, Inc. (Minneapolis, MN)
Primary Examiner: Evanisko; George R.
Assistant Examiner: Kahelin; Michael
Attorney, Agent or Firm: Soldner; Michael C. Barry; Carol F. Wolde-Michael; Girma
An introducer system and method for positioning and fixedly engaging a lead at an implantation site that includes a torque transfer sheath, extending from a proximal end to a distal end, receiving the lead, an outer sheath, having a distal end, receiving the lead positioned within the torque transfer sheath, and a handle operable between a first position enabling advancement and retraction of the lead through the handle and a second position fixedly engaging a proximal end of the lead within the handle. The lead is advanced through the outer sheath to extend outward a predetermined distance from the distal end of the outer sheath and the fixation helix is rotated through the predetermined distance to be fixedly engaged at the implantation site in response to simultaneous rotation and advancement of the lead and the torque transfer sheath through rotation and advancement of the handle in the second position. |
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DETAILED DESCRIPTION The present invention provides an introducer system that can be employed to introduce and fix a distal fixation helix of a cardiac lead at a desired implantation site in a heart chamber or cardiac blood vessel or the epicardium of the heart that satisfies these needs.
The introducer system is adapted to introduce a small diameter cardiac lead having a lead body enclosing a lead conductor(s) and extending between a proximal lead connector element(s) and a distal electrode(s) and fixation helix through a tortuous pathway to the heart, wherein the lead body has insufficient pushability and torqueability to be easily advanced by itself through the tortuous pathway, to locate and attach the fixation helix at a desired implantation site.
In an embodiment of the present invention, introducer system includes a torque transfer sheath, extending from a proximal end to a distal end, receiving the lead, an outer sheath, having a distal end, receiving the lead positioned within the torque transfer sheath, and a handle operable between a first handle position enabling advancement and retraction of the lead through the handle and a second handle position fixedly engaging a proximal end of the lead within the handle.
The lead is advanced through the outer sheath to extend outward a predetermined distance from the distal end of the outer sheath and the fixation helix is rotated through the predetermined distance to be fixedly engaged at the implantation site in response to simultaneous rotation and advancement of the lead and the torque transfer sheath through rotation and advancement of the handle in the second handle position.
In another embodiment of the present invention, the introducer system includes a torque transfer sheath, extending from a proximal end to a distal end, receiving the lead, an outer sheath, having a distal end, receiving the lead positioned within the torque transfer sheath, and a hub body, extending from a proximally extending portion having a threaded portion positioned thereon to a connecting portion, the outer sheath and the hub body being fixedly engaged through threaded interaction of mating threads formed between the outer sheath and the connecting portion of the hub body
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Heart Surgery 
