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Pervenous electrical pacing lead with foldable fins

  • US 4,721,118 A
  • Filed: 03/27/1987
  • Issued: 01/26/1988
  • Est. Priority Date: 04/20/1981
  • Status: Expired due to Term
First Claim
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1. A finned pervenous lead for electrically connecting an electrical generator with an internal organ, comprising:

  • a flexible electrically conductive insulated lead having a first preselected lead diameter and proximal and distal ends, said proximal end having means for electrically connecting said lead to the electrical generator, a distal electrode assembly connected to said distal end of said lead, said distal electrode assembly including a distal electrode tip portion having a second preselected diameter slightly in excess of the lead diameter, an intermediate body portion proximal to said distal electrode tip having a third preslected diameter which is less than the electrode tip diameter, an axis and at least two tissue-engaging, thin, flexible, flat fins which are circumferentially sidewise deflectible and which project radially outwardly from different radial locations on said intermediate body portion at about the same axial location on said intermediate body portion, each fin extending outwardly in a plane which includes the axis of said intermediate body portion and each fin being attached to said intermediate body portion at a fold line extending substantially parallel to the axis of said intermediate body portion, substantially an entire flat side of each of said fins being capable of folding circumferentially about said fold line against, contacting and conforming to the adjacent circumferential surface of said intermediate body portion without overlapping when said fins are bent in the same sense around said intermediate body portion and about said fold lineswhereby the diameter of a cylindrical envelope defined by said fins on said lead and folded against said intermediate body portion can be kept as small as possible and no greater than substantially the outer diameter of a French 7 lead during insertion withdrawal after deployment to project radially of the lead and interference by the projecting fins with an introducer sheath through which the lead is fed into the vascular system can be reduced by manually twisting the lead about its axis to fold the fins at said fold lines around and against the circumferential surface of the intermediate body portion in a non-overlapping manner.

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