Catheter having partially-braided wall
A wall of a catheter (a) includes a braided portion having an outer surface, an inner surface, and a braided interior between the outer and inner surfaces, and (b) is shaped to define first and second longitudinally-running channels therethrough. A distal portion of the catheter is shaped to define first and second lateral openings. An angle between (a) a first line running between the first and second lateral openings, and (b) a second line that is parallel to a central longitudinal axis of the catheter when the catheter is straight, is between 30 and 150 degrees. A flexible longitudinal member passes from a proximal portion of the catheter to the distal portion via the first channel, out of the first channel via the first lateral opening, into the second channel via the second lateral opening, and from the distal portion to the proximal portion via the second channel.
1. Apparatus comprising:
a catheter having a catheter wall, which is shaped so as to define (i) an innermost surface defining a main catheter lumen and (ii) an outermost surface, and which comprises:
a braided longitudinal portion having an outer layer, an inner layer, and a braided interior radially between the outer and the inner layers; and
an unbraided longitudinal portion, which is unbraided in an entire radial region extending between the innermost surface and the outermost surface, and which is shaped so as to define catheter-wall lateral openings,
wherein the braided and unbraided longitudinal portions are located at separate axially discrete locations along the catheter wall and axially abut each other,
wherein the catheter wall is shaped to define longitudinally-running channels that run through, radially between the innermost and the outermost surfaces of the catheter wall, both (a) the inner layer of the braided longitudinal portion of the catheter wall and (b) the unbraided longitudinal portion of the catheter wall;
a control handle that surrounds a proximal portion of the catheter such that (a) all of the catheter wall that is distal to a distal end of the control handle comprises the braided longitudinal portion, and (b) at least 10% of the catheter wall that is proximal to the distal end of the control handle comprises the unbraided longitudinal portion;
a reinforcing tube at least partially surrounding the unbraided longitudinal portion, wherein a wall of the reinforcing tube is shaped to define reinforcing-tube lateral openings therethrough that are aligned with the catheter-wall lateral openings defined by the unbraided longitudinal portion of the catheter wall; and
one or more flexible longitudinal members that pass through the reinforcing-tube lateral openings and the catheter-wall lateral openings, into the longitudinally-running channels.
2. The apparatus according to claim 1 , wherein the flexible longitudinal members are coupled to the control handle.
3. The apparatus according to claim 1 , wherein a length of the braided longitudinal portion is between 600 and 1000 mm.
4. The apparatus according to claim 1 , wherein a length of the unbraided longitudinal portion is between 250 and 400 mm.