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

• Current Assignee: AMS Medinvent SA
• Original Assignee: MedInvent, LLC
• Inventors: Kropf, Laurent
• Primary Examiner(s): Rosenbaum, C. Fred
• Assistant Examiner(s): Macey, H.
• Application Number:
  US06/846,220
• Time in Patent Office: 855 Days
• Field of Search: 128/341, 128/345, 128/334 R, 128/1 R, 604/104, 604/106, 604/49, 267/61 R, 267/166, 267/180, 267/181, 29/173, 428/542.8
• US Class Current: 606/191
• CPC Class Codes: A61F 2/01 Filters implantable into blood vessels
• CPC Class Codes: A61F 2/04 Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts A61F2/18, A61F2/20 take precedence; devices, other than stent-grafts, providing patency to, or preventing collapsing of, tubular structures of the body other than stent-grafts, e.g. stents A61F2/82; instruments specially adapted for placement or removal of stents or stent-grafts A61F2/95
• CPC Class Codes: A61F 2/88 the wire-like elements formed as helical or spiral coils forming a net-like or mesh-like structure A61F2/90
• CPC Class Codes: A61F 2/91 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
• CPC Class Codes: A61F 2002/016 made from wire-like elements
• CPC Class Codes: A61F 2230/0091 helically-coiled or spirally-coiled, i.e. having a 2-D spiral cross-section

Abstract

A planar blank is provided which permits the manufacture of a coil spring suitable for implantation. The blank has an elongated, essentially straight mid section which at its ends passes over into sections that are bent in the plane of the blank in opposite directions to form a blank having Z-shape. A coil spring made from the blank (in which the spring material as seen in cross section has radially flattened shape) at its ends has a lower pitch than the mid section or no pitch at all.

Claims

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.

2. A coil spring according to claim 1, wherein the material of said one end section is axially tapering towards the free end so as to reduce axial flow resistance of the coil spring.

3. A coil spring according to claim 1, wherein the spring material over at least a major part of the spring is provided with radially through-going apertures.

4. A coil spring according to claim 3, wherein said apertures cover an area so that remaining spring material has a tangential width of at most 2.5 mm.

7. A coil spring according to claim 4, wherein the end sections each extend over less than about 3/4 turn.

5. 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 midsection of circular cylindric shape and two integral end sections having relative to the midsection, lower pitch;

wherein the material of the two end sections has essentially the same length, said length corresponding to less than a full turn of the spring.

6. A coil spring according to claim 5, wherein said mid section is made from an axially smaller material than material of the end sections.

8. A coil spring according to claim 5, wherein the end sections each extend over less than about 3/4 turn.