Anchoring guidewire

Patent metadata

Field	Value
Publication number	US-2017239448-A1
Application number	US-201715435848-A
Country	US
Kind code	A1
Filing date	Feb 17, 2017
Priority date	Feb 18, 2016
Publication date	Aug 24, 2017
Grant date	—

Abstract

The present disclosure relates to the field of endoscopy. Specifically, the present disclosure relates to systems and methods for anchoring guidewires within body passageways to provide efficient and accurate positioning and/or exchange of medical instruments to a target location. More specifically, the present disclosure relates to an anchoring guidewire that includes a self-expanding coil for precise positioning and/or exchange of a biopsy tool within a bronchial passageway.

First claim

What is claimed is:

1 . An anchoring guidewire, comprising:
an elongate core wire having a proximal portion and a distal portion; a retention member disposed at a distal end of the elongate core wire; and an extendable-retractable sheath slidably disposed about at least a portion of the elongate core wire and the retention member; wherein the retention member is in a first configuration with a first outer diameter when disposed inside the extendable-retractable sheath and a second configuration with a second outer diameter when disposed outside the extendable-retractable sheath; and wherein the second outer diameter is larger than the first outer diameter.

2 . The anchoring guidewire of claim 1 , wherein the retention member includes a wire formed in a shape of a coil.

3 . The anchoring guidewire of claim 1 , wherein the retention member is configured to contact a wall of a body lumen when in the second configuration.

4 . The anchoring guidewire of claim 1 , wherein the retention member comprises a distal winding of the elongate core wire.

5 . The anchoring guidewire of claim 1 , wherein the retention member is attached to the distal end of the elongate core wire by one of a weld, solder, adhesive, glue or resin.

6 . The anchoring guidewire of claim 1 , wherein the elongate core wire comprises a metal selected from the group consisting of platinum, tungsten, titanium, stainless steel, nickel and alloys thereof.

7 . The anchoring guidewire of claim 1 , wherein the retention member comprises a shape memory material selected from the group consisting of platinum, tungsten, titanium, stainless steel, nickel and alloys thereof.

8 . The anchoring guidewire of claim 1 , wherein extendable-retractable sheath comprises a polymer selected from the group consisting of acrylate-based polymers, polyurethane-based polymers, polynorbornene-based polymer and polylactide-based polymers.

9 . The anchoring guidewire of claim 1 , wherein a distal portion of the elongate core wire is steerable.

10 . The anchoring guidewire of claim 9 , wherein the distal portion of the elongate core wire is steerable by manipulating the proximal portion of the elongate core wire.

11 . The anchoring guidewire of claim 1 , wherein retracting the extendable-retractable sheath in a proximal direction relative to the distal end of the elongate core wire releases the retention member from within the extendable-retractable sheath.

12 . The anchoring guidewire of claim 1 , wherein advancing the extendable-retractable sheath in a distal direction relative to the distal end of the elongate core wire returns the retention member into the extendable-retractable sheath.

13 . A system, comprising:
a medical device comprising
an elongate body having a proximal end, a distal end and a working channel extending therebetween;
an anchoring guidewire slidably disposed within the working channel of the medical device, the anchoring guidewire comprising
an elongate core wire having a proximal portion and a distal portion;
a retention member disposed at a distal end of the elongate core wire; and
an extendable-retractable sheath slidably disposed about at least a portion of the elongate core wire and the retention member;
wherein the retention member is in a first configuration with a first outer diameter when disposed inside the extendable-retractable sheath, and a second configuration with a second outer diameter when disposed outside the extendable-retractable sheath; and wherein the second outer diameter is larger than the first outer diameter.

14 . The system of claim 13 , further comprising a medical instrument slidably disposed about the anchoring guidewire within the working channel of the medical device.

15 . The system of claim 13 , wherein the medical device is an endoscope.

16 . The system of claim 14 , wherein the medical instrument is a biopsy tool.

17 . A method, comprising:
inserting an anchoring guidewire into a body lumen, the anchoring guidewire comprising
an elongate core wire;
a retention member disposed at a distal end of the elongate core wire; and
a sheath slidably disposed about at least a portion of the elongate core wire;
positioning the distal end of the elongate core wire proximate to a target tissue; and sliding the sheath relative to the distal end of the elongate core wire such that the retention member expands to a form that has a diameter greater than a diameter of the wire and sheath.

18 . The method of claim 17 , wherein the retention member is a helically-biased coil.

19 . The method of claim 17 , wherein the retention member contacts a body lumen wall when in the expanded form, thereby securing the anchoring guidewire within the body lumen.

20 . The method of claim 17 , further comprising advancing a tool over the anchoring guidewire to the target tissue.

Assignees

• Boston Scient Scimed Inc

Inventors

• Cao Hong
• Fleury Sean

Classifications

• A61M2025/09075

  having a core without a coil possibly combined with a sheath · CPC title

• A61B2017/00867

  shape memory effect · CPC title

• A61M2025/09183

  having tools at the distal tip · CPC title

• A61M2025/09175

  having specific characteristics at the distal tip · CPC title

• A61M2025/09125

  Device for locking a guide wire in a fixed position with respect to the catheter or the human body · CPC title