Stent graft systems with restraints in channels and methods thereof
A stent graft system includes a first layer of graft material, a second layer of graft material, one or more stent members, one or more reducing belts, and a release wire. The one or more stent members are located between the first layer of graft material and the second layer of graft material. The second layer of graft material is formed to have a corresponding channel over each of the one or more stent members. The one or more reducing belts each include a loop at both ends and each is located in a corresponding channel around a corresponding one of the stent members. The release wire passes through both loops of each of the one or more reducing belts when the one or more stent members are in a compressed state. Pulling the release wire allows for the stent graft system to radially expand.
1 . A method of manufacturing a stent graft system, the method comprising:
placing a plurality of stent members on a first layer of graft material;
placing at least partially around each stent member of the plurality of stent members a respective spacer of a plurality of spacers;
encapsulating at least a portion of each spacer of the plurality of spacers using a second layer of graft material; and
removing each of the plurality of spacers from a respective opening in the second layer of graft material to leave a respective channel around each stent member of the plurality of stent members between the second layer of graft material and the first layer of graft material.
2 . The method of claim 1 ,
wherein each spacer of the plurality of spacers comprises a tube.
3 . The method of claim 1 , further comprising:
placing at least partially around each stent member of the plurality of stent members in the respective channel a respective reducing belt of a plurality of reducing belts.
4 . The method of claim 3 ,
wherein each reducing belt of the plurality of reducing belts comprises thread.
5 . The method of claim 3 ,
wherein each of the plurality of reducing belts includes loops; and
wherein the method further comprises placing a release wire through the loops of each of the plurality of reducing belts to hold the plurality of stent members in a radially compressed state.
6 . The method of claim 3 ,
wherein the reducing belts are positioned such that ends of each reducing belt of the plurality of reducing belts extend out of a respective opening in the second layer of graft material.
7 . The method of claim 1 , further comprising:
axially compressing the second layer of graft material to form pleats in the second layer of graft material;
applying heat to set creases for the pleats in the second layer of graft material; and
pulling the second layer of graft material to axially uncompress the second layer of graft material after the pleats have been thermally set.
8 . The method of claim 7 ,
wherein said applying heat comprises baking the second layer of graft material in an oven to set the creases for the pleats in the second layer of graft material.
9 . A method of manufacturing a stent graft system, the method comprising:
placing a stent member on a first layer of graft material;
placing at least partially around the stent member a spacer;
encapsulating at least a portion of the spacer using a second layer of graft material;
removing the spacer from an opening in the second layer of graft material to leave a respective channel around the stent member between the second layer of graft material and the first layer of graft material; and
placing a reducing belt in the channel around the stent member.
10 . The method of claim 9 ,
wherein the spacer comprises a tube.
11 . The method of claim 9 ,
wherein the reducing belt places the stent member in a radially compressed state.
12 . The method of claim 9 ,
wherein the reducing belt comprises thread.
13 . The method of claim 9 ,
wherein the reducing belt comprises two ends, and
wherein the method further comprises releasably attaching the two ends with a release wire.
14 . The method of claim 13 ,
wherein the reducing belt is positioned such that ends of the belt extend out of an opening in the second layer of graft material.
15 . The method of claim 9 ,
wherein the reducing belt comprises loops, and
wherein the method further comprises placing a release wire through the loops of the reducing belt to hold the belt in a radially compressed state.
16 . The method of claim 15 ,
wherein the reducing belt loops are positioned at respective ends of the belt.
17 . The method of claim 9 , further comprising:
axially compressing the second layer of graft material to form pleats in the second layer of graft material;
applying heat to set creases for the pleats in the second layer of graft material; and
pulling the second layer of graft material to axially uncompress the second layer of graft material after the pleats have been thermally set.
18 . The method of claim 7 ,
wherein said applying heat comprises baking the second layer of graft material in an oven to set the creases for the pleats in the second layer of graft material.
19 . A stent graft system manufactured according to the method of claim 1 .
20 . A stent graft system manufactured according to the method of claim 9 .