Endovascular medical device with plurality of wires
View Patent ↗An endovascular device ( 1, 100, 200, 300 ) having a distal end ( 2 ), a proximal end ( 4 ) and a body portion ( 3 ) therebetween. The body portion is made of a multiple filament helically wound row (A) of wires ( 5 ), provided with a sealing coating ( 14 ) on the inside surface or the outside surface or both. The device may be a catheter ( 1 ), a sheath, an introducer, a delivery device, a pusher ( 100 ), an embolization coil delivery device ( 300 ), or a receptacle ( 208 ) for an expandable prosthesis ( 220 ) used with a delivery device ( 200 ). From 2 to 12, and preferably from 4 to 8, wires ( 5 ) are used in the row, and fewer wires may be used proceeding toward the distal end ( 2 ) for greater flexibility. The helically wound row of wires transmits torque and provides pushability to the device while resisting kinking, and enables a small outside diameter for reaching very small vessels and extending through very tortuous vessels.
1. A catheter system comprising:
a catheter having a distal end, a body portion having at least one lumen with an inside surface extending through the body portion in a longitudinal direction from a proximal end toward the distal end, and at least one central member for coaxial advancement through said lumen, which the body portion is made of a multiple filament helically wound row of wires, wherein said row of wires has a pitch angle in the range of 26° to 76°, and wherein said inside surface of said body portion is mainly undeformable by the central member.
2. A catheter system as in claim 1 , wherein said row of wires has a pitch angle in the range of 35° to 40°.
3. A catheter system as in claim 1 , wherein said row of wires has a pitch angle in the range of 40° to 65°.
4. A catheter system as in claim 1 , wherein said row of wires has a pitch angle in the range of 70° to 76°.
5. A catheter system as in claim 1 , wherein said body portion is made of between 2 and 12 filaments helically wound to form the row of wires.
6. A catheter system as in claim 1 , wherein said body portion is made of between 4 and 8 filaments helically wound to form the row of wires.
7. A catheter system as in claim 1 , wherein at least a portion of the body portion is provided with a coating of elastic material.
8. A catheter system as in claim 7 , wherein the coating of elastic material is a low-friction coating.
9. A delivery system comprising:
a delivery device with a distal end and a shaft portion with a lumen extending in a longitudinal direction from a proximal end and toward the distal end, a self-expandable prosthesis arranged in a receptacle at the distal end of the delivery device, and a pusher member arranged in the lumen of said delivery device to cause relative axial movement of the self-expandable prosthesis with respect to the delivery device, said shaft portion of said delivery device comprising at least two helically wound filaments wound to form a row wires.
10. A delivery system as in claim 9 , wherein said self-expandable prosthesis is radially compressed when arranged in the receptacle.
11. A delivery system as in claim 9 , wherein said shaft portion of said delivery device comprises said at least 12 or less helically wound filaments wound to form the row of wires.