Reinforced multi-lumen medical shaft
View Patent ↗A medical shaft or tubing includes an elongate tubular member having a proximal end and a distal end. The shaft also includes a tubular wall extending between the proximal and distal ends to define a first lumen. The elongated tubular member further comprises a second lumen extending through at least a portion of the tubular member. The tubular wall additionally includes a reinforcing element that surrounds at least a portion of the first lumen and that surrounds and overlaps at least a portion of the second lumen.
1. A medical tubing comprising:
an elongate tubular member having a proximal end, a distal end and a tubular wall extending therebetween which defines a first lumen, the first lumen comprising an inlet and an outlet,
the elongate tubular member further comprising a second lumen extending through at least a portion of the tubular member, the second lumen comprising an inlet and an outlet defined by a first side port,
the tubular wall including a reinforcing element that surrounds at least a portion of the first lumen, the reinforcing element being a braided structure comprising a plurality of woven ribbons with interstices disposed between the ribbons,
the reinforcing element surrounding and overlapping at least a portion of the second lumen, and
the first side port extending through the tubular wall to the second lumen and connecting an outer surface of the tubular member to the second lumen, the side port also extending through one of the interstices of the reinforcing element.
2. The medical tubing of claim 1 , wherein the braided structure comprises a super-elastic alloy.
3. The medical tubing of claim 2 , wherein the super-elastic alloy comprises a nickel-titanium alloy.
4. The medical tubing of claim 1 , wherein the braided structure comprises a polymer.
5. The medical tubing of claim 1 , wherein the braided structure comprises a metal.
6. The medical tubing of claim 1 , wherein the tubular member comprises a polymer.
7. The medical tubing of claim 6 , wherein the polymer is polytetrafluoroethylene.
8. The medical tubing of claim 1 , wherein the first lumen has a first diameter and the second lumen has a second diameter, the first diameter being greater than the second diameter.
9. A medical tubing comprising:
an elongate tubular member having a proximal end, a distal end and a tubular wall extending therebetween which defines a first lumen, the first lumen comprising an inlet and an outlet,
the elongate tubular member further comprising a second lumen extending through at least a portion of the tubular member, the second lumen comprising an inlet and an outlet defined by a first side port,
the tubular wall including a reinforcing element that surrounds at least a portion of the first lumen, the reinforcing element being a braided structure comprising a plurality of woven ribbons with interstices disposed between the ribbons,
the reinforcing element surrounding and overlapping at least a portion of the second lumen, and
the first side port extending through the tubular wall to the second lumen and connecting an outer surface of the tubular member to the second lumen, the side port extending through one of the interstices of the reinforcing element,
wherein the braided structure further comprises a first pick for a proximal portion of the braided structure disposed between the side port and the proximal end of the tubular member that is less than a second pick for a distal portion of the braided structure disposed between the side port and the distal end of the tubular member.
10. A method of making a multi-lumen catheter, the method comprising the steps of:
covering a first mandrel with a first polymer;
covering a second mandrel with a second polymer;
placing the first mandrel adjacent to the second mandrel;
sliding a length of a tubular reinforcing element around the first mandrel and the second mandrel, the tubular reinforcing element being a braided structure that is woven from a plurality of ribbons with interstices disposed between the ribbons;
inserting an end of the second mandrel through one of the interstices;
covering the tubular reinforcing element with an outer tubing;
puncturing the outer tubing with the end of the second mandrel;
covering the outer tubing with a heat-shrink tubing;
heating the heat-shrink tubing;
removing and discarding the heat-shrink tubing; and
removing the first mandrel and the second mandrel.
11. The method of claim 10 , wherein the first polymer is polytetraflouroethylene.
12. The method of claim 10 , wherein the braided structure comprises a super-elastic alloy.
13. The method of claim 12 , wherein the super-elastic alloy comprises a nickel-titanium alloy.
14. The method of claim 10 , wherein the braided structure comprises a metal.
15. The method of claim 10 , wherein the braided structure comprises a non-metal.