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Planar blank and a coil spring manufactured therefrom

  • US 4,760,849 A
  • Filed: 03/31/1986
  • Issued: 08/02/1988
  • Est. Priority Date: 04/10/1985
  • Status: Expired due to Term
First Claim
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1. A coil spring for intraluminal implantation and having an essentially helix-shaped configuration, the spring material being radially flattened as seen in an axial cross section and comprising a mid section of circular cylindric shape and two integral end sections having, relative to the mid section, lower pitch, one end section consists of several turns which, in a direction perpendicular to the centre line of the coil spring, lie in essentially a common plane and which in a direction towards a free end of said one end section have a progressively decreasing radius of curvature.

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