Catheter assembly

Patent metadata

Field	Value
Publication number	US-2018369540-A1
Application number	US-201816103526-A
Country	US
Kind code	A1
Filing date	Aug 14, 2018
Priority date	Feb 18, 2016
Publication date	Dec 27, 2018
Grant date	—

Abstract

A catheter assembly includes: a catheter; a catheter hub connected to the catheter; an inner needle removably disposed in the catheter; a needle hub connected to the inner needle; and a deflection suppressing member that suppresses deflection of the inner needle by supporting the inner needle via the catheter at a location distal of the catheter hub. The deflection suppressing member is supported so as to be movable relative to the needle hub in an axial direction.

First claim

What is claimed is:

1 . A catheter assembly comprising:
a catheter; a catheter hub connected to the catheter; an inner needle removably disposed in the catheter; a needle hub connected to the inner needle; and a deflection suppressing member that suppresses deflection of the inner needle by supporting the inner needle via the catheter at a location distal of the catheter hub, wherein the deflection suppressing member is supported so as to be movable relative to the needle hub in an axial direction.

2 . The catheter assembly according to claim 1 , wherein:
the deflection suppressing member includes, at a distal end thereof, a support portion that contacts the catheter, and the support portion is movable relative to the catheter while maintaining contact with the catheter.

3 . The catheter assembly according to claim 1 , wherein:
the needle hub includes a guide projection, the deflection suppressing member includes a groove configured to engage with the guide projection of the needle hub, and a length of the groove is longer than ½ of an overall length of the catheter.

4 . The catheter assembly according to claim 1 , further comprising:
a catheter operating portion disposed on the catheter hub, wherein the deflection suppressing member includes a slit permitting relative movement of the catheter operating portion in the axial direction, wherein the catheter operating portion protrudes from a side of the deflection suppressing member opposite the catheter hub via the slit in the deflection suppressing member.

5 . The catheter assembly according to claim 4 ,
wherein the deflection suppressing member includes:
a base portion supported by the needle hub and extending in the axial direction; and
a distal end forming portion extending from the base portion in a distal end direction and enabling detachment of the catheter operating portion from the slit.

6 . The catheter assembly according to claim 5 , wherein:
the distal end forming portion includes two arms that closes a distal end of the slit in an initial state, and at least one arm of the two arms is movable with respect to the base portion.

7 . The catheter assembly according to claim 6 , wherein:
the at least one arm is pivotable with respect to the base portion via a hinge portion.

8 . The catheter assembly according to claim 6 , wherein:
the at least one arm is detachable from the base portion.

9 . The catheter assembly according to claim 4 , wherein:
the catheter operating portion includes an engaging portion configured to engage with the deflection suppressing member so as to suppress deflection of the deflection suppressing member.

10 . The catheter assembly according to claim 1 , wherein:
the deflection suppressing member includes a support portion that is in contact with or in proximity to an outer peripheral surface of the catheter and that surrounds at least half of the outer peripheral surface of the catheter in a circumferential direction.

11 . The catheter assembly according to claim 10 , further comprising:
a friction reduction member configured to reduce frictional resistance between the support portion (and the catheter, the friction reduction member being disposed on an inner peripheral portion of the support portion.

12 . The catheter assembly according to claim 11 , wherein:
the friction reduction member is a gel material or a rolling element that contacts the catheter.

13 . The catheter assembly according to claim 1 , wherein:
the inner needle is hollow and has an inner cavity, and the catheter assembly further comprises a guide wire disposed in the inner cavity so as to be movable relative to the inner needle in the axial direction.

14 . The catheter assembly according to claim 13 , further comprising:
a wire operating portion that supports the guide wire; and a catheter operating portion disposed on the catheter hub, wherein the catheter operating portion includes an operating element protruding from a side of the deflection suppressing member opposite the catheter hub, and the distal end portion of the wire operating portion is in contact with or in proximity to the operating element of the catheter operating portion in an initial state of the catheter assembly.

15 . A method of using a catheter assembly, the method comprising:
providing the catheter assembly, which comprises:
a catheter,
a catheter hub connected to the catheter,
an inner needle removably disposed in the catheter,
a needle hub connected to the inner needle, and
a deflection suppressing member that suppresses deflection of the inner needle by supporting the inner needle via the catheter at a location distal of the catheter hub,
wherein the deflection suppressing member is supported so as to be movable relative to the needle hub in an axial direction;
grasping the catheter assembly and puncturing skin of a patient toward a blood vessel of the patient with the inner needle and the catheter; and puncturing the blood vessel with a distal end of each of the inner needle and the catheter by advancing members other than the deflection suppressing member while holding the deflection suppressing member.

Assignees

• Terumo Corp

Inventors

• Asai Toshiya

Classifications

• A61M25/0631

  having means for fully covering the needle after its withdrawal, e.g. needle being withdrawn inside the handle or a cover being advanced over the needle · CPC title

• A61M25/09041

  Mechanisms for insertion of guide wires · CPC title

• A61M2025/006

  having a special surface topography or special surface properties, e.g. roughened or knurled surface · CPC title

• A61M2025/0687

  having means for atraumatic insertion in the body or protection of the tip of the sheath during insertion, e.g. special designs of dilators, needles or sheaths · CPC title

• A61M25/0045

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