Stent delivery system
First Claim
1. A stent delivery system comprising:
- i) a sleeve to surround a self-expanding stent, to be retracted proximally, relative to the stent, to release the stent progressively, starting with a distal end of the stent;
ii) an abutment to engage the stent, within the volume defined by the sleeve, to restrain the stent from moving proximally, as the sleeve is retracted proximally;
iii) a tubular, lumen-defining catheter shaft extending proximally from the abutment, which resists axial compressive stresses during proximal withdrawal of the sleeve;
iv) a tension member which runs a length of the catheter shaft, which receives a tensile stress at a proximal end of the tension member and thereby imposes on the sleeve an axial stress for said proximal retraction of the sleeve relative to the stent, the tension member connecting to a connection ring inside the sleeve and coaxially arranged with a larger ring on an abluminal surface of the sleeve opposite the connection ring;
v) the catheter shaft includes a proximal guidewire lumen exit port remote from a proximal end of the catheter shaft, whereby the stent delivery system is a rapid exchange system; and
vi) the catheter shaft carries at a catheter shaft distal end an inner catheter, which defines a guidewire lumen and extends from an inner catheter proximal end at the proximal guidewire lumen exit port to an inner catheter distal end which defines a distal guidewire lumen exit port at a distal end of the sleeve,wherein the inner catheter and the catheter shaft are arranged parallel between the distal end of the catheter shaft and the proximal guidewire lumen exit port with spacing therebetween to accommodate the tension member outside the guidewire lumen and inside the lumen of the catheter shaft, a catheter shaft extension at the catheter shaft distal end, a luminal surface of the sleeve moves, during said proximal retraction, over an abluminal surface of the catheter shaft extension.
1 Assignment
0 Petitions
Accused Products
Abstract
A stent delivery catheter for rapid exchange carries at its distal end a sleeve (12) to surround a self-expanding stent (10) and a tension wire (30) running the length of the catheter to release the stent by proximal withdrawal of the sleeve. A tubular catheter shaft (62) surrounds the tension wire. An inner catheter (44) defines a guidewire lumen (48) with a proximal guidewire exit part (58) at the distal end of the catheter shaft. The inner catheter carries an abutment (32) to restrain the stent from moving proximally when the sleeve is pulled proximally. There is a gap (74) between the abluminal surface of the inner catheter and the luminal surface of the catheter shaft, in which the tension wire is accommodated.
309 Citations
20 Claims
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1. A stent delivery system comprising:
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i) a sleeve to surround a self-expanding stent, to be retracted proximally, relative to the stent, to release the stent progressively, starting with a distal end of the stent; ii) an abutment to engage the stent, within the volume defined by the sleeve, to restrain the stent from moving proximally, as the sleeve is retracted proximally; iii) a tubular, lumen-defining catheter shaft extending proximally from the abutment, which resists axial compressive stresses during proximal withdrawal of the sleeve; iv) a tension member which runs a length of the catheter shaft, which receives a tensile stress at a proximal end of the tension member and thereby imposes on the sleeve an axial stress for said proximal retraction of the sleeve relative to the stent, the tension member connecting to a connection ring inside the sleeve and coaxially arranged with a larger ring on an abluminal surface of the sleeve opposite the connection ring; v) the catheter shaft includes a proximal guidewire lumen exit port remote from a proximal end of the catheter shaft, whereby the stent delivery system is a rapid exchange system; and vi) the catheter shaft carries at a catheter shaft distal end an inner catheter, which defines a guidewire lumen and extends from an inner catheter proximal end at the proximal guidewire lumen exit port to an inner catheter distal end which defines a distal guidewire lumen exit port at a distal end of the sleeve, wherein the inner catheter and the catheter shaft are arranged parallel between the distal end of the catheter shaft and the proximal guidewire lumen exit port with spacing therebetween to accommodate the tension member outside the guidewire lumen and inside the lumen of the catheter shaft, a catheter shaft extension at the catheter shaft distal end, a luminal surface of the sleeve moves, during said proximal retraction, over an abluminal surface of the catheter shaft extension. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A stent delivery device, comprising:
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a catheter shaft having proximal and distal ends and defining a lumen extending between the proximal and distal ends; a catheter shaft extension disposed on the distal end of the catheter shaft and extending distally, the catheter shaft extension defining a first central axis and a lumen communicating with the lumen of the catheter shaft, a wall of the catheter shaft extension defining a proximal guidewire port; a guidewire shaft defining a second central axis and disposed at the distal end of the catheter shaft and within the lumen of the catheter shaft extension, a proximal end of the guidewire shaft engaging the wall of the catheter shaft extension defining the proximal guidewire port, a distal end of the guidewire shaft extending distally, an exterior surface of the guidewire shaft and an interior surface of the catheter shaft extension defining a space therebetween; a sheath slidably disposed around a distal end of the catheter shaft extension and extending distally to cover a stent disposed on the distal end of the guidewire shaft; and a tension member disposed in the space, a distal end of the tension member connecting to a connecting ring inside an interior of the sheath and coaxially arranged with a larger ring on the abluminal surface of the sheath opposite the connection ring, a proximal end of the tension member disposed proximate the proximal end of the catheter shaft, wherein the first and second central axes are offset. - View Dependent Claims (18, 19, 20)
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Specification