Intracranial stent and method of use

• US 6,669,719 B2
• Filed: 07/02/2001
• Issued: 12/30/2003
• Est. Priority Date: 12/09/1996
• Status: Expired due to Term

• Current Assignee: Micro Therapeutics, Inc. (Medtronic Plc)
• Original Assignee: Micro Therapeutics, Inc. (Medtronic Plc)
• Inventors: Wallace, George, Brenneman, Rodney, Greene, Robert R., Lenker, Jay, Berryman, Thomas J.
• Primary Examiner(s): Thaler, Michael H.
• Application Number:
  US09/897,218
• Publication Number:
  US 20020004676A1
• Time in Patent Office: 911 Days
• Field of Search: 623/1.12, 623/1.15, 623/1.2, 623/1.11, 623/1.23, 606/108
• US Class Current: 623/1.12
• CPC Class Codes: A61B 17/12022 Occluding by internal devices, e.g. balloons or releasable wires plugging an opening in the wall of an organ A61B17/0057; occluders for the cervical canal A61F6/146; vas deferens occluders A61F6/20
• CPC Class Codes: A61B 17/12118 for positioning in conjunction with a stent
• CPC Class Codes: A61B 17/1214 Coils or wires
• CPC Class Codes: A61B 17/122 Clamps or clips , e.g. for the umbilical cord for the vas deferens A61F6/206
• CPC Class Codes: A61B 2017/1205 Introduction devices
• CPC Class Codes: A61B 2017/12063 electrolytically detachable
• CPC Class Codes: A61B 2017/12068 detachable by heat
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2/92 Stents in the form of a rolled-up sheet expanding after insertion into the vessel , e.g. with a spiral shape in cross-section
• CPC Class Codes: A61F 2/9517 handle assemblies therefor
• CPC Class Codes: A61F 2/97 the outer sleeve being splittable
• CPC Class Codes: A61F 2002/823 Stents, different from stent-grafts, adapted to cover an aneurysm
• CPC Class Codes: A61F 2002/9511 the retaining means being filaments or wires
• CPC Class Codes: A61F 2210/0076 multilayered, e.g. laminated structures
• CPC Class Codes: A61F 2230/0095 Saddle-shaped
• CPC Class Codes: A61F 2250/0071 breakable or frangible
• CPC Class Codes: A61F 2250/0098 radio-opaque, e.g. radio-opaque markers

Abstract

A stent and stent catheter for intra-cranial use. The stent is a rolled sheet stent and is releasably mounted on the distal tip of the catheter by means of a non-sliding retention and release mechanism. The non-sliding release mechanism is operated remotely at the proximal end of the catheter by means of a linear translator. The stent is rolled tightly on the distal tip of the catheter and flexibility of the tightly rolled stent is promoted by ribbed or slatted construction (or, alternatively, slotted construction) in which the various layers of the stent are provided with numerous slats which counter align when the stent is expanded to form an imperforate wall from a plurality of perforate layers.

Claims

1. A stent delivery system comprising:

an insertion catheter having a distal end and a proximal end;

a rolled stent mounted on the distal end of the insertion catheter, said rolled stent having a small diameter configuration and a large diameter configuration;

said rolled stent having an outer edge overlapping an outer surface of an outer layer;

binding means for affixing the outer edge to the outer surface of the outer layer of said rolled stent, wherein the binding means forms a sealed roll of the rolled stent when the rolled stent is in its small diameter configuration; and

release means for releasing the sealed roll to allow the rolled stent to expand to its large diameter configuration;

wherein the binding means comprises tape securing the outer edge to the outer surface of the outer layer of said rolled stent.

2. A stent delivery system comprising:

an insertion catheter having a distal end and a proximal end;

a rolled stent mounted on the distal end of the insertion catheter, said rolled stent having a small diameter configuration and a large diameter configuration;

said rolled stent having an outer edge overlapping an outer surface of an outer layer;

binding means for affixing the outer edge to the outer surface of the outer layer of said rolled stent, wherein the binding means forms a sealed roll of the rolled stent when the rolled stent is in its small diameter configuration; and

release means for releasing the sealed roll to allow the rolled stent to expand to its large diameter configuration;

wherein the binding means comprises a weld securing the outer edge to the outer surface of the outer layer of said rolled stent.

3. A stent delivery system comprising:

an insertion catheter having a distal end and a proximal end;

a rolled stent mounted on the distal end of the insertion catheter, said rolled stent having a small diameter configuration and a large diameter configuration;

said rolled stent having an outer edge overlapping an outer surface of an outer layer;

wherein the outer edge is secured to the outer surface of the outer layer of said rolled stent thus forming a sealed roll when the rolled stent is in its small diameter configuration;

at least one pre-scored line scored into the outer layer; and

;

a zip-strip disposed under the outer layer of the rolled stent along the scoring line, and a pull-strip attached to the zip-strip, said pull-strip being operable from the proximal end of the insertion catheter to tear the outer layer along the pre-scored line.