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EP0346564A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Compressive stent and delivery system

Assignee: Medtronic Inc
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Filing: 1989-02-20
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Granted: —
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Expires: 2009-02-20
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Abstract

Abstract A cylindrical shaped stent (100) to prevent arterial acute closure and subsequent restenosis is inserted immediately after a balloon angio­plasty procedure as an extension of this procedure. The cylinder is formed of longitudinal wires of biocompatible metal. The wires (10) are welded together in pairs at alternate ends with each pair of wires bent into a V-section. The wires (10) are all formed into a cylinder welded closed to form the stent. The stent is compressed and loaded into an outer catheter by a special tool. The stent is positioned and released for self expansion in situ by an inner catheter. A guide wire through both assists in threading the catheters through blood vessels. This guide wire can be the same one used in the prior balloon angioplasty if desired. An optional guide catheter encloses and directs the outer catheter to a point adjacent to the site. The stent (100) itself may be radiopaque or radiopaque markers on the distal ends of the inner and outer catheter can be provided and the radiopaque material detected by an external fluoroscope or x-ray to determine when the stent is at the desired prior balloon angioplasty site to position the stent properly. Hemostasis valve connectors at the proximal ends of the inner and outer catheters control bleeding, and permit injecting radiopaque dye or other therapeutic agents at the stent site. The hemostasis valves also permit relative adjust­ment of the various catheters necessary for releasing the stent (100) within the artery.

Inventors

  • 👤 Creg W. Dance
  • 👤 Brice Letac
  • 👤 Rodney G. Wolff
  • 👤 Alain Cribier

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-23 16:58
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/95; A61F2/82; A61F2/86; A61F2/9522; A61F2/9525; A61B; A61B90/00; A61B90/39; A61B2090/3933; A61F2/962; A61F2/966; A61F2/02; A61F2/30; A61F2002/30001; A61F2002/30003; A61F2002/3006; A61F2002/3008; A61F2002/30316; A61F2002/30329; A61F2002/30451; A61F2220/00; A61F2220/0025; A61F2220/0058; A61F2250/00; A61F2250/0058; A61F2250/0096; A61F2250/0098

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 163 words
A stent comprising: (a) a number of equally dimensioned and shaped wires each having an essentially straight center segment with end segments bent at oblique angles with respect to said center segment such that opposite said end segments of each said wire are essentially parallel one end segment to the other; and (b) said wires oriented and equally spaced to form a tubular shape said bent end segments of each wire oriented parallel, over­lapping and contiguous with each adjacent wire, resulting in an acute angle being formed by said center segments of each adjacent pair of wires, being secured together at all end segments; and (c) said wires fashioned from spring metal biocompatible material, such that said wires can be bent to store energy in said wire segments to permit reducing the diameter of said stent to permit inserting said stent into an outer catheter sized to receive said stent when compressed to permit placing said stent percutaneously within a living organism; and
Claim 2
Dependent Claim 163 words
A stent comprising: (a) a number of equally dimensioned and shaped wires each having an essentially straight center segment with end segments bent at oblique angles with respect to said center segment such that opposite said end segments of each said wire are essentially parallel one end segment to the other; and (b) said wires oriented and equally spaced to form a tubular shape said bent end segments of each wire oriented parallel, over­lapping and contiguous with each adjacent wire, resulting in an acute angle being formed by said center segments of each adjacent pair of wires, being secured together at all end segments; and (c) said wires fashioned from spring metal biocompatible material, such that said wires can be bent to store energy in said wire segments to permit reducing the diameter of said stent to permit inserting said stent into an outer catheter sized to receive said stent when compressed to permit placing said stent percutaneously within a living organism; and
Claim 3
Dependent Claim 56 words
The structure as in Claim 1 and further comprising an inner catheter sized to slideably fit within said outer catheter with the walls of said inner catheter sized to bear against the end of said stent when said inner catheter is fit within said outer catheter and said stent compressed to fit within said outer catheter.
Claim 4
Dependent Claim 26 words
The assembly as in Claim 1 wherein said inner and outer catheter are tipped with a radiopaque marker at their distal ends adjacent to said stent.
Claim 5
Dependent Claim 53 words
The structure as in Claim 2 wherein a guide wire is threaded coaxially through said inner catheter and said stent and wherein said inner catheter and said stent are sized to permit said guide wire to be slid through their respective centers as an aid in threading said catheters through a circulatory system.
Claim 6
Dependent Claim 38 words
The structure as in Claim 4 wherein said outer catheter is threaded coaxially through a guide catheter sized to slideably receive said outer catheter to provide guiding means in said circulatory system for said outer and inner catheter.
Claim 7
Dependent Claim 52 words
The structure as in Claim 4 wherein said inner catheter can be slideably locked and sealed to said outer catheter by means of a first Y-connector hemostatis valve and said guide wire is exposed at the proximal end to permit slideable adjustment of said guide wire with respect to said inner catheter.
Claim 8
Dependent Claim 74 words
The structure as in Claim 5 wherein said inner catheter can be slideably locked and sealed to said outer catheter by means of a first Y-connector hemostasis valve and said outer catheter can be slideably locked and sealed to said guide catheter by means of a second Y-connector hemostasis valve and said guide wire is exposed at the proximal end to permit slide­able adjustment of said guide wire with respect to said inner catheter.
Claim 9
Dependent Claim 14 words
The assembly as in Claim 1 wherein said wires are secured together by welding.
Claim 10
Dependent Claim 43 words
A generally cylindrical shaped tool having an axial bore from a first end and a flared axial opening from a second end joined by a coaxial segment, said tool being sized to provide a means for loading said stent within said outer catheter.
Claim 11
Dependent Claim 43 words
A generally cylindrical shaped tool having an axial bore from a first end and a flared axial opening from a second end joined by a coaxial segment, said tool being sized to provide a means for loading said stent within said outer catheter.
Claim 12
Dependent Claim 15 words
The assembly as in Claim 1 wherein said wires are made of a radiopaque material.

References Cited (Backward Citations)

EP0177330B1 Cited
EP0221570B1 Cited
US4665918A Cited
DE3706077C1 Cited

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