Intracranial stent

• US 6,254,628 B1
• Filed: 12/09/1996
• Issued: 07/03/2001
• 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, Lenker, Jay, Berryman, Thomas J., Brenneman, Rodney, Greene, Robert R.
• Primary Examiner(s): Thaler, Michael H.
• Application Number:
  US08/762,110
• Time in Patent Office: 1,667 Days
• Field of Search: 606/108, 623/1.1, 623/1.12, 623/1.23
• 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 self-expanding stent mounted on the distal end of the insertion catheter, said self-expanding stent having a small diameter configuration and a large diameter configuration;

tear-away sheath means for retaining the stent on the distal end of the insertion catheter, the tear-away sheath means is separate from the insertion catheter, and the tear-away sheath means does not slide over the stent after release; and

sheath release means for releasing the stent from the tear-away sheath means to allow the stent to expand.

2. A stent delivery system comprising:

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

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

tear-away sheath means for retaining the stent on the distal end of the insertion catheter, the tear-away sheath means is detachable from the insertion catheter; and

sheath release means for releasing the stent from the tear-away sheath means to allow the stent to expand;

wherein release is accomplished without requiring that the tear-away sheath move axially over the stent in order to release the stent;

wherein removal of the insertion catheter is accomplished without requiring that the tear-away sheath move axially over the stent.

3. A catheter delivery system comprising:

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

a stent mounted on the distal end of the insertion catheter;

stent retaining sheath means which holds the stent on the distal end of the insertion catheter, the stent retaining sheath means is detachable from the insertion catheter;

an elongate member operably connected to the stent retaining sheath means, said elongate member being operable from the proximal end of the insertion catheter to tear the stent retaining sheath means to release the stent, the elongate member acts to release the stent retaining sheath means from the stent without causing the inner surface of the sheath means to slide over the stent after release; and

a linear translator located at the proximal end of the insertion catheter and engaging the elongate member for moving the elongate member axially in relation to the insertion catheter, the elongate member acts to release the stent retaining sheath means from the stent without causing the inner surface of the sheath means to slide over the stent.

4. A stent delivery catheter comprising:

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

a self-expanding stent mounted on the distal tip of the insertion catheter, said self-expanding stent having a compressed configuration and an expanded configuration;

tear-away means for retaining the stent on the distal tip of the insertion catheter in the compressed configuration; and

means for releasing the stent from the distal tip of the insertion catheter and allowing the stent to expand to the expanded configuration, wherein said means for releasing the stent from the distal tip of the insertion catheter permits the stent to be released and the insertion catheter to be withdrawn without causing the retaining means to slide over the surface of the stent.