System and method for delivering helical stents
First Claim
1. A catheter carrying a self-expanding helical prosthesis, said catheter comprising:
- a catheter body having a proximal end and a distal end;
a barrel rotatably attached to the distal end of the catheter body;
a self-expanding helical prosthesis disposed over the barrel; and
an axially retractable cover disposed over said helical prosthesis, said cover maintaining the prosthesis in a radially reduced diameter condition;
wherein axial retraction of the cover allows the prosthesis to expand radially and wherein the barrel rotates as the prosthesis is deployed in a lumen which immobilizes a first released end of the stent.
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Accused Products
Abstract
A catheter for delivering self-expanding stents and other helical prostheses comprises a catheter body having a rotatable barrel at its distal end. The helical prosthesis is received within a helical channel on the rotatable barrel and covered with a retractable cover. Optionally, the channel includes a split membrane for covering the helical stent and preventing direct engagement by the stent against the cover. As the cover is retracted, the stent deploys radially outward and engages an inner wall of the lumen in which it is being deployed. Uncoiling or unwinding of the stent is accommodated by rotation of the barrel so that the stent is not dragged against the inner luminal wall potentially damaging said wall.
432 Citations
51 Claims
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1. A catheter carrying a self-expanding helical prosthesis, said catheter comprising:
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a catheter body having a proximal end and a distal end; a barrel rotatably attached to the distal end of the catheter body; a self-expanding helical prosthesis disposed over the barrel; and an axially retractable cover disposed over said helical prosthesis, said cover maintaining the prosthesis in a radially reduced diameter condition; wherein axial retraction of the cover allows the prosthesis to expand radially and wherein the barrel rotates as the prosthesis is deployed in a lumen which immobilizes a first released end of the stent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A catheter for delivering self-expanding helical prostheses, said catheter comprising:
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a catheter body having a proximal end, a distal end; and
a helical channel formed near the distal end for receiving a helical prosthesis, wherein said channel has a penetrable retaining structure formed thereover; andan axially retractable cover over said helical channel, wherein said cover cooperates with the retaining structure to hold a helical prosthesis within the helical channel but when retracted allows the helical prosthesis to pass through the retaining structure. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A catheter system comprising a self-expanding helical prosthesis and a catheter for delivering said prosthesis, wherein the prosthesis comprises:
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a helical prosthesis comprising a resiliently wound helical element having when unconstrained at body temperature a length, a diameter, and a number of turns; wherein the catheter comprises; a catheter body having a proximal end, a distal end, and a helical channel formed near the distal end thereof for receiving the prosthesis, wherein the helical channel has a number of turns and spacing between adjacent turns which allow the helical prosthesis to be carried in the channel in a radially reduced diameter condition with a length equal to the unconstrained length of the prosthesis. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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40. A method for loading a helical prosthesis on a catheter, said method comprising:
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providing a self-expanding helical prosthesis having when unconstrained at body temperature a length, a diameter, and a number of turns; and radially constraining the prosthesis over the catheter, wherein the number of turns is increased relative to the unconstrained number in order to maintain the distance between the ends of the constrained prosthesis at a length equal to the unconstrained length of the prosthesis. - View Dependent Claims (41, 42, 43)
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42. A method as in claim 40, wherein the constraining step comprises capturing the helical prosthesis within a cover which is axially retractably mounted on the catheter.
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43. A method as in claim 40, wherein the constraining step comprises capturing the helical prosthesis within a helical channel on the catheter, wherein the channel has dimensions selected to hold the prosthesis with a length equal to its unconstrained length.
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44. A method as in 43, wherein the helical prosthesis is constrained over the catheter to have a length in the range from 10 mm to 60 mm, an outer diameter in the range from 2 mm to 4 mm, and a number of turns in the range from 5 to 70.
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45. A method for deploying a self-expanding helical stent, said method comprising:
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providing a catheter having a self-expanding helical prosthesis rotatably mounted thereon, wherein said prosthesis is constrained in a radially collapsed configuration; manipulating the catheter to position the prosthesis at a target site within a blood vessel; progressively releasing successive turns of the helical prosthesis from one end thereof, wherein said one end first engages a wall of the blood vessel and thereafter the rotatably mounted portion of the prosthesis rotates as the prosthesis continues to be released. - View Dependent Claims (46, 47, 48, 49)
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50. A kit comprising:
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a rotatable barrel having a connector at one end and a helical channel, wherein the connector is rotatable mountable at the distal end of a catheter body; a stent removably secured within the helical channel; and a package holding the barrel and stent. - View Dependent Claims (51)
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Specification