Multi-lumen catheters for small body vessel applications

Patent metadata

Field	Value
Publication number	US-10080865-B2
Application number	US-201514595773-A
Country	US
Kind code	B2
Filing date	Jan 13, 2015
Priority date	Jan 14, 2014
Publication date	Sep 25, 2018
Grant date	Sep 25, 2018

Abstract

Catheters adapted for use in small body vessels are described. A catheter includes an elongate shaft having a main body that defines first and second lumens. An inner tubular member is disposed in the second lumen and is formed of a material that has a stiffness that is greater than a stiffness of the material forming the main body and that has an elastic modulus greater than or equal to about 400 MPa.

First claim

We claim:

1. A catheter, comprising:
an elongate shaft having a proximal end, a distal end, a main body extending between the proximal end and the distal end, a distal portion disposed adjacent to the distal end of the elongate shaft, and a longitudinal axis, the main body formed of a first material and defining first, second, and third lumens, the third lumen disposed between the first lumen and the second lumen;
a balloon disposed on the distal portion of the elongate shaft, the balloon defining an interior chamber in communication with the first lumen and having uninflated and inflated configurations;
an inner tubular member disposed in the second lumen and extending along an axial length of the elongate shaft, the inner tubular member formed of a second material; and
a stiffening member disposed within the third lumen, extending through the distal portion of the elongate shaft, and having a solid cross-section;
wherein the first material has a first stiffness, the second material has a second stiffness, and the second stiffness is greater than the first stiffness; and
wherein the second material has an elastic modulus greater than or equal to about 400 MPa.

2. The catheter of claim 1 , wherein one of the first material and the second material comprises a polyamide material.

3. The catheter of claim 2 , wherein one of the first material and the second material comprises a nylon material.

4. The catheter of claim 1 , wherein both of the first material and the second material comprise a polyamide material.

5. The catheter of claim 1 , wherein both of the first material and the second material comprise a nylon material.

6. The catheter of claim 1 , wherein the inner tubular member comprises a wall and the wall intersects the longitudinal axis of the elongate shaft.

7. The catheter of claim 1 , wherein the first lumen has a kidney cross-sectional shape.

8. The catheter of claim 1 , wherein the elongate shaft has a French Gauge of 4 or less than 4.

9. The catheter of claim 1 , wherein the stiffening member comprises a metal.

10. The catheter of claim 9 , wherein the stiffening member comprises stainless steel.

11. The catheter of claim 1 , wherein the stiffening member comprises a polymeric material.

12. The catheter of claim 1 , wherein the main body defines a fourth lumen.

13. The catheter of claim 12 , further comprising a second stiffening member disposed within the fourth lumen.

14. The catheter of claim 1 , further comprising a reinforcement tubular member disposed over the inner tubular member and within the second lumen.

15. The catheter of claim 14 , wherein the reinforcement tubular member comprises a braided member.

16. The catheter of claim 1 , wherein the stiffening member is a rod.

17. The catheter of claim 1 , wherein the stiffening member is a wire member.

18. The catheter of claim 1 , wherein the third lumen has a central axis; and
wherein a hypothetical plane extending orthogonally to a cross-section of the elongate shaft extends through the central axis of the third lumen and each of the first and second lumens.

19. The catheter of claim 18 , wherein the stiffening member intersects the longitudinal axis of the elongate shaft.

20. A catheter, comprising:
an elongate shaft having a proximal end, a distal end, a main body extending between the proximal end and the distal end, a distal portion disposed adjacent to the distal end of the elongate shaft, and a longitudinal axis, the main body formed of a first material and defining first, second and third lumens, the third lumen disposed between the first lumen and the second lumen;
a balloon disposed on the distal portion of the elongate shaft, the balloon defining an interior chamber in communication with the first lumen and having uninflated and inflated configurations;
an inner tubular member disposed in the second lumen and extending along an axial length of the elongate shaft, the inner tubular member formed of a second material; and
a stiffening member disposed within the third lumen, extending through the distal portion of the elongate shaft, and having a solid cross-section;
wherein the elongate shaft has a French Gauge of 5 or less than 5;
wherein the first material has a first stiffness, the second material has a second stiffness, and the second stiffness is greater than the first stiffness; and
wherein the second material has an elastic modulus greater than or equal to about 400 MPa.

21. A catheter, comprising:
an elongate shaft having a proximal end, a distal end, a main body extending between the proximal end and the distal end, a distal portion disposed adjacent to the distal end of the elongate shaft, and a longitudinal axis, the main body formed of a first material and defining first, second, and third lumens, the third lumen disposed between the first lumen and the second lumen;
a balloon disposed on the distal portion of the elongate shaft, the balloon defining an interior chamber in communication with the first lumen and having uninflated and inflated configurations;
an inner tubular member disposed in the second lumen and extending along an axial length of the elongate shaft, the inner tubular member formed of a second material;
a braided member disposed over the inner tubular member and within the second lumen; and
a stiffening member disposed within the third lumen, extending through the distal portion of the elongate shaft, and having a solid cross-section;
wherein the elongate shaft has a French Gauge of 5 or less than 5;
wherein the first material has a first stiffness, the second material has a second stiffness, and the second stiffness is greater than the first stiffness; and
wherein the second material has an elastic modulus greater than or equal to about 400 MPa.

Assignees

• Cook Medical Technologies Llc

Inventors

• Bailey Alyssa M
• Baker Brett O
• Boatman Scott E
• Drewes Jr David A

Classifications

• A61M2025/1061

  having separate inflations tubes, e.g. coaxial tubes or tubes otherwise arranged apart from the catheter tube · CPC title

• A61L29/143

  Stabilizers · CPC title

• A61M25/0026 Primary

  Multi-lumen catheters with stationary elements (catheter assemblies comprising a catheter in combination with a guide tube, sheath or sleeve A61M2025/0681; catheters comprising telescoping coaxial elements A61M2025/0175) · CPC title

• A61M25/0053

  having a variable stiffness along the longitudinal axis, e.g. by varying the pitch of the coil or braid · CPC title

• A61M2025/0063

  having means, e.g. stylets, mandrils, rods or wires to reinforce or adjust temporarily the stiffness, column strength or pushability of catheters which are already inserted into the human body · CPC title