Introducer sheath and introducer assembly

Patent metadata

Field	Value
Publication number	US-9320873-B2
Application number	US-201213495496-A
Country	US
Kind code	B2
Filing date	Jun 13, 2012
Priority date	Jun 15, 2011
Publication date	Apr 26, 2016
Grant date	Apr 26, 2016

Abstract

An introducer sheath, which is formed from a tubular member provided with a hollow portion through which an elongated body is freely insertable, and which includes a distal portion and a main body portion, wherein the inner diameter of the distal portion is formed to become gradually smaller toward the distal side, and on the inner surface of the distal portion, there is provided a hydrophobic coating having a friction coefficient lower than the friction coefficient of the tubular member.

First claim

What is claimed is:

1. An introducer sheath comprising:
an elongated tubular member possessing a distal-most end and configured to be inserted in a living body tissue, the distal-most end of the elongated tubular member having an opening, the tubular member including a distal portion and a main body portion portion;
the distal portion terminating distally at the distal-most end of the tubular member, the distal portion possessing an outer surface;
the main body portion having a distal-most end connected to and extending proximally from a proximal-most end of the distal portion so that the main body portion is located entirely proximally of the distal portion, the main body portion possessing an outer surface;
the elongated tubular member including a through hole extending throughout a longitudinal extent of the tubular member and opening to the distal-most end of the elongated tubular member, the through hole being configured to receive an elongated body, the through hole possessing an inner diameter;
the distal portion of the elongated tubular member being comprised of a taper portion in which the inner diameter of the through hole gradually and continuously tapers to the distal-most end of the elongated tubular member so that the inner diameter is smallest at the distal-most end of the tubular member, the taper portion possessing an outer surface;
a hydrophilic lubricating coating on an outer surface of the main body portion;
a hydrophobic coating on the inner surface of the through hole in the taper portion, the hydrophobic coating extending proximally from the distal-most end of the tubular member toward the main body portion;
the hydrophobic coating possessing a friction coefficient lower than a friction coefficient of the hydrophilic lubricating coating before the hydrophilic lubricating coating contacts liquid;
wherein the taper portion possesses an outer diameter that gradually and continuously tapers to the distal-most end of the elongated tubular member so that the outer diameter is smallest at the distal-most end of the tubular member; and
a hydrophobic coating covering the entire outer surface of the taper portion of the distal portion of the elongated tubular member.

2. The introducer sheath according to claim 1 , wherein the hydrophobic coating on the inner surface of the through hole extends continuously from the distal-most end of the tubular member, throughout the entirety of the longitudinal extent of the taper portion and into the main body portion of the tubular member.

3. The introducer sheath according to claim 2 , wherein the inner diameter of the through hole in the main body portion does not taper in a narrowing manner toward the distal portion.

4. The introducer sheath according to claim 3 , wherein the hydrophobic coating covering the entire outer surface of the taper portion also covers the outer surface of a part of the distal portion which possesses a constant outer diameter.

5. The introducer sheath according to claim 1 , wherein the distal portion of the elongated tubular member includes a non-taper portion positioned entirely proximally of the taper portion, the inner diameter of the through hole in the non-taper portion being constant, and the hydrophobic coating extending continuously from the distal-most end of the tubular member through the taper portion, the non-taper portion, and into the main body portion of the tubular member.

6. The introducer sheath according to claim 1 , wherein the distal-most end of the main body portion is connected to the proximal-most end of the distal portion at a boundary portion, the hydrophobic coating overlying the hydrophilic lubricating coating at the boundary portion.

7. The introducer sheath according to claim 1 , wherein the distal portion of the elongated tubular member includes a constant outer diameter portion, and the hydrophobic coating which covers the entire outer surface of the taper portion of the distal portion of the elongated tubular member also covers at least a part of the outer surface of the constant outer diameter portion.

8. The introducer sheath according to claim 1 , wherein at least a portion of the hydrophobic coating which covers the entire outer surface of the taper portion of the distal portion of the elongated tubular member overlies the hydrophilic lubricating coating.

9. An introducer sheath comprising:
a tubular member possessing a hollow portion through which an elongated body is freely insertable, the tubular member including a distal portion and a main body portion, the main body portion being positioned proximally of the distal portion;
the hollow portion of the distal portion possessing an inner diameter which becomes gradually smaller toward a distal end of the tubular member;
the distal portion possessing an inner surface provided with a hydrophobic coating having a friction coefficient lower than the friction coefficient of the tubular member;
a hydrophobic coating being disposed on an outer surface of the distal portion;
the main body portion possessing an outer surface;
a hydrophilic lubricating coating being disposed on the outer surface of the main body portion; and
the hydrophobic coating possessing a friction coefficient lower than a friction coefficient of the hydrophilic lubricating coating before the hydrophilic lubricating coating contacts liquid.

10. The introducer sheath according to claim 9 , wherein at a boundary portion between the distal portion and the main body portion, the hydrophobic coating overlies the hydrophilic lubricating coating.

11. The introducer sheath according to claim 9 , wherein when swelling by absorbing blood, the hydrophilic lubricating coating has an outer diameter approximately equal to or greater than the outer diameter of the hydrophobic coating.

12. The introducer sheath according to claim 9 , wherein the hydrophobic coating on the inner surface of the distal portion extends continuously from a distal-most end of the tubular member through the hollow portion of the distal portion and into the main body portion of the tubular member.

13. The introducer sheath according to claim 9 , wherein the hollow portion in the main body portion has an inner diameter that does not taper in a narrowing manner toward the distal portion.

14. The introducer sheath according to claim 9 , wherein at least a portion of the hydrophobic coating which covers the outer surface of the distal portion of the tubular member also overlies the hydrophilic lubricating coating.

15. An introducer sheath comprising:
an elongated tubular member possessing a distal-most end and configured to be inserted in a living body tissue, the distal-most end of the elongated tubular member having an opening, the tubular member including a distal portion and a main body portion;
the distal portion terminating distally at the distal-most end of the tubular member, the distal portion possessing an outer surface;
the main body portion having a distal-most end connected to and extending proximally from a proximal-most end of the distal portion so that the main body portion is located entirely proximally of the distal portion, the main body portion possessing an outer surface;
the elongated tubular member including a through hole extending throughout a longitudinal extent of the tubular member and opening to the distal-most end of the elongated tubular member, the through hole being configured to receive an elongated body, the through hole possessing an inner diameter;
the distal portion of the elongated tubular member being comprised of a taper portion in which the inner diameter of the through hole grad

Assignees

• Okamura Ryo
• Terumo Corp

Inventors

• Okamura Ryo

Classifications

• A61M25/01

  Introducing, guiding, advancing, emplacing or holding catheters (A61M25/10 takes precedence) · CPC title

• A61M2025/0046

  Coatings for improving slidability · CPC title

• A61M25/0662 Primary

  Guide tubes · CPC title

• A61M2025/0047

  the inner layer having a higher lubricity · CPC title

• A61M25/0045

  multi-layered, e.g. coated (coating materials A61L29/08) · CPC title