Catheter stiffeners

• US 5,382,238 A
• Filed: 05/20/1993
• Issued: 01/17/1995
• Est. Priority Date: 05/20/1993
• Status: Expired due to Term

• Current Assignee: Covidien AG (Medtronic Plc)
• Original Assignee: Quinton Instrument Co. (Cardica Incorporated)
• Inventors: Sommercorn, Richard K., Abrahamson, Timothy A.
• Primary Examiner(s): Yasko, John D.
• Assistant Examiner(s): CERMAK, ADAM
• Application Number:
  US08/065,081
• Time in Patent Office: 607 Days
• Field of Search: 604/158, 604/164, 604/170, 604/204, 604/280, 604/282, 128/657, 128/772
• US Class Current: 604/170.01
• CPC Class Codes: A61M 2025/0063 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 Class Codes: A61M 25/0102 Insertion or introduction using an inner stiffening member, e.g. stylet or push-rod
• CPC Class Codes: A61M 25/09025 with sliding mandrils

Abstract

A catheter assembly including a wire stiffener or a dilator and modified wire stiffener which are used in combination to assist in the insertion of a relatively soft catheter into the patient wherein the wire stiffener temporarily stiffens the catheter and the modified wire stiffener temporarily stiffens the dilator for insertion of the combined wire stiffener and dilator into the catheter. The catheter preferably includes one or more lumens therein and includes an end opening and one or more side openings thereon.

Claims

1. A wire stiffener for use with a catheter, said wire stiffener comprising:

an elongate member having distal and proximal end portions thereon and a body portion therebetween, wherein said distal end portion includes a distal tip thereon and said proximal end includes a cap member thereon for operative connection with a catheter;

said distal tip being a generally elongate member having a first outer diameter and a passageway extending therethrough, said passageway including distally and proximally oriented openings wherein said proximally oriented opening opens generally adjacent to said body portion; and

said body portion is operatively interconnected with and extends between said cap member and said distal tip and includes at least one area of increased flexibility thereon as compared to the flexibility of the remainder of said body portion.

2. The wire stiffener of claim 1 wherein said body portion includes a second outer diameter which is smaller than said first outer diameter of said distal tip.

3. The wire stiffener of claim 2 wherein said cap member includes a third outer diameter thereon and said third outer diameter is greater than said second outer diameter of said wire stiffener.

4. The wire stiffener of claim 1 wherein at least one area of increased flexibility is located further from said distal end portion than said proximal end portion along said body portion.

5. The wire stiffener of claim 1 wherein said body portion is formed of at least one elongate wire member.

6. The wire stiffener of claim 1 wherein said distal tip is a generally cylindrical member.

7. The wire stiffener of claim 1 wherein said cap member includes a luer lock type of connector thereon.

8. The wire stiffener of claim 1 wherein said cap member includes a passageway extending longitudinally therethrough.

9. The wire stiffener of claim 8 wherein said proximal portion of said elongate member includes an alignment surface thereon to capture and guide a guidewire into said passageway of said cap member.

10. A stiffener member for use with a catheter, said stiffener member comprising:

an elongate member including a proximal end portion having a cap member thereon and a distal end portion with a distal tip member thereon, and said cap member and said tip member having first and second diameters thereon;

a body portion extending between said cap member and said tip member, said body portion having a third diameter and including an area of flexibility thereon which is more flexible than the remainder of said body portion; and

said cap member and said tip member further including passageways therein sized to receive a guidewire inserted therethrough wherein said passageway of said tip member includes a pair of openings therein to enable the passage of the guidewire therethrough, and said first and second diameters are greater than said third diameter.

11. A catheter assembly comprising:

an elongate wire stiffener having distal and proximal end portions thereon and wherein said proximal end portion includes a hub member thereon;

an elongate dilator having distal and proximal end portions and a lumen extending therethrough wherein said lumen is sized to receive said wire stiffener substantially therein, said proximal end portion including a hub member thereon which is formed to releasably engage said hub member of said stiffening wire; and

an elongate catheter having distal and proximal end portions and at least one lumen extending therethrough wherein said lumen is sized to receive said dilator substantially therein, said proximal end portion including a hub member thereon which is formed to releasably engage said hub member of said dilator thereon.

12. The catheter assembly of claim 11 wherein said catheter is an elongate catheter having distal and proximal end portions and at least first and second lumens formed by a septum extending along a longitudinally extending axis thereof and wherein said first lumen extends between said proximal end portion and an opening on said distal end portion and is sized to receive said dilator substantially therein and said second lumen extends between said proximal end portion of said catheter and a further opening in said catheter.

13. A catheter assembly comprising:

an elongate catheter member having distal and proximal end portions and a lumen extending therebetween; and

an elongate stiffening member having distal and proximal end portions with one or more wire members having a first diameter extending therebetween and an area of increased flexibility thereon as compared to the flexibility of the remainder of said stiffening member, said distal end portion forming a distal tip having a diameter which is larger than said diameter of said one or more wire members and which is sized to be received through the lumen of a catheter.

14. The catheter assembly of claim 13 wherein said distal tip includes a lumen extending therethrough and said lumen is sized to receive a guidewire therein.

15. The catheter assembly of claim 13 wherein said proximal end portion includes a hub member thereon, and said hub member includes a lumen extending therethrough, and said hub member lumen is sized to receive a guidewire therein.

16. The catheter assembly of claim 13 wherein said proximal end portion of said catheter member includes a hub member thereon, and said hub member of said catheter member is sized to receive said hub member located on said proximal end portion of said stiffener member releasably connected thereon.