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AssigneeCardiac Pacemakers, Inc.
InventorsRonald W. Heil, Jr., Gregory R. Ley, Dwight Skinner, Larry L. Hum
Estimating the term…
A helical element for insertion into tissue comprises a helical element having an insertion end, a protruding end and an open central area within the wire, rods, filaments, cables or the like that form the helix. The helical element has at least its insertion end covered by a cap of a water-soluble or water-dispersible composition. The cap is provided with a surface shape in a cross-section in which surface variations are present in the cross-section which create a surface orientation where a line from the center of the cross-section can intersect the surface, and a line perpendicular to said radius at a point of intersection with said surface forms four quadrants, three of said quadrants containing water-soluble or water-dispersible cap material. There is either a hollow area within the composition within the open central area or the material is more porous than the remaining material. The helical element preferably comprises an electrical lead, such as a positive endocardial lead, with an electrode at the protruding or distal end of the lead. The helical element may comprise any biocompatable material with sufficient structural integrity to provide a secure attachment to tissue in a patient. Where the helical element is also to provide an active (electrically active) function, the composition of the helical element should also be electrically conductive.
A device for insertion into tissue comprising a helical element with an open central area and a water-soluble or water-dispersible cap for said helical element, the cap for said helical element having a surface shape in a cross-section in which surface variations are present in the cross-section which create a surface orientation where at least one radius comprising a line from a center of the cross-section intersects a surface of the cap at a point of intersection, and a line perpendicular to said at least one radius at the point of intersection with said surface forms four quadrants, three of said four quadrants containing water-soluble or water-dispersible cap material extending from the point of intersection, wherein said surface variations are located on the cap in a position such that, when the device is inserted into a body, said surface variations are only exposed to substances external to the cap to dissolve the cap, and wherein the surface variations increase a surface area of the cap as compared to a cap of the same maximum outside diameter of the cross-section without such surface variations for decreasing the time for dissolution of said cap in water.
A device for insertion into tissue comprising a helical element with an open central area and a water-soluble or water-dispersible cap for said helical element, the cap for said helical element having a hollow area which overlaps at least a part of said open central area, and there are indentations in an outer surface of said cap which decrease the time for dissolution of said cap in water as compared to a cap of the same maximum outside diameter of cross-section without such indentations.
A device for insertion into tissue comprising a helical element with an open central area and a water-soluble or water-dispersible cap for said helical element, the cap for said helical element having
A device for insertion into tissue comprising a helical element within an open central area and a water-soluble or water-dispersible cap for said helical element, the cap for said helical element having a surface shape in a cross-section which varies by both increasing and decreasing its diameter at different cross sections taken along the length of the cap, with at least two relative increases and at least two relative decreases, wherein said relative increases and relative decreases are located on the cap in a position such that, when the device is inserted into a body, said relative increases and relative decreases are only exposed to substances external to the cap to dissolve the cap.
A device for insertion into tissue, the device comprising:
The device of claim 25, wherein the cap comprises mannitol.
Dependencies are inferred from the claim text.