Torque coil and method

Patent metadata

Field	Value
Publication number	US-2018339139-A1
Application number	US-201515776833-A
Country	US
Kind code	A1
Filing date	Nov 18, 2015
Priority date	Nov 18, 2015
Publication date	Nov 29, 2018
Grant date	—

Abstract

A torque coil 10 includes an inner wire layer 14 helically wound in a constricted state. An outer wire layer 18 is helically wound over the inner wire layer in a constricted state. An outer polymer cover 20 surrounds the inner and outer layers thereby securing the inner and outer layers within the outer polymer cover.

First claim

1 . A torque coil comprising:
an inner wire layer helically wound in a constricted state; an outer wire layer helically wound over the inner wire layer in a constricted state; an outer polymer cover surrounding the inner and outer wire layers thereby securing the wire layers within the outer polymer cover; a penetrated section wherein the polymer material of the outer polymer cover penetrates between adjacent filars in the outer wire layer in a of the torque coil; and a non-penetrated section wherein the polymer material of the outer polymer cover does not significantly penetrate between adjacent filars in the outer wire layer in a of the torque coil; wherein the torque coil has increased relative flexibility in the non-penetrated section and has decreased relative flexibility in the penetrated section.

2 . The torque coil of claim 1 further comprising a core of a polymer material within the inner wire layer, such that the inner and outer wire layers are secured between the core and the outer polymer cover.

3 . The torque coil of claim 2 , wherein at least one of polymer material from the core and polymer material from the outer polymer cover penetrates between filars in at least one of the inner and outer wire layers.

4 . The torque coil of claim 1 further comprising an intermediate wire layer helically wound over the inner wire layer in a constricted state, the outer wire layer being helically wound over the intermediate wire layer.

5 . (canceled)

6 . The torque coil of claim 1 further comprising:
a tight-wound section wherein at least one of the inner and outer wire layers is tight wound; and
an open-wound section wherein at least one of the inner and outer wire layers is open wound;
wherein the torque coil has increased relative flexibility in the open-wound section and has decreased relative flexibility in the tight-wound section.

7 . The torque coil of claim 1 further comprising:
a full-wire layer section wherein both the inner and outer wire layers are within the full-wire layer section; and
a partial-wire layer section wherein the outer wire layer is not within the partial-wire layer section;
wherein the torque coil has increased relative flexibility in the partial-wire layer section and has decreased relative flexibility in the full-wire layer section.

8 . The torque coil of claim 1 , wherein a pull wire is attached directly to at least one of the wire layers adjacent a distal end of the torque coil.

9 . The torque coil of claim 1 , wherein the outer polymer cover secures the inner and outer layers without use of welding, brazing or soldering.

10 . The torque coil of claim 1 , wherein the coil is configured for high-speed rotation and one-to-one torque.

11 . The torque coil of claim 1 , wherein the lumen diameter is between 0.008 inches and 0.220 inches, the diameter of the coil is between 0.01 inches and 0.250 inches, and the diameter of the wire is between 0.0005 inches and 0.004 inches.

12 . A torque coil comprising:
a polymer core; an inner wire layer helically wound in a constricted state over the polymer core; an outer wire layer helically wound over the inner wire layer in a constricted state; and an outer polymer cover surrounding the inner and outer wire layers thereby securing the wire layers between the polymer core and the outer polymer cover.

13 . The torque coil of claim 12 , wherein the torque coil has increased relative flexibility in flexible section and has decreased relative flexibility in stiff section.

14 . The torque coil of claim 13 , wherein the stiff section of the torque coil comprises one or more of:
a section wherein the polymer material of the outer polymer cover penetrates between adjacent filars in the outer wire layer in a of the torque coil; a section wherein at least one of the inner and outer wire layers is tight wound; and a section wherein both the inner and the outer wire layer is contained within the flexible section.

15 . The torque coil of claim 13 , wherein the flexible section of the torque coil comprises one or more of:
a section wherein the polymer material of the outer polymer cover does not significantly penetrate between adjacent filars in the outer wire layer in a of the torque coil; a section wherein at least one of the inner and outer wire layers is open wound; and a section wherein the outer wire layer is not within the flexible section.

16 . A method of forming a torque coil comprising:
forming a polymer core; helically winding an inner wire layer in a constricted state over the polymer core; helically winding an outer wire layer over the inner wire layer in a constricted state; and forming an outer polymer cover to surround the inner and outer wire layers thereby securing the wire layers between the polymer core and the outer polymer cover.

17 . The method of claim 16 further comprising temporarily securing one of the inner and outer wire layers with a clamp until the outer polymer cover secures the inner and outer wire layers between the core and the outer polymer cover.

18 . The method of claim 16 , wherein:
forming the outer polymer includes controlling the polymer material of the outer polymer cover such that it penetrates between adjacent filars in the outer wire layer of the torque coil in a penetrated section; and forming the outer polymer includes controlling the polymer material of the outer polymer cover such that it does not significantly penetrate between adjacent filars in the outer wire layer in a of the torque coil in a non-penetrated section such that the torque coil has increased relative flexibility in the non-penetrated section and has decreased relative flexibility in the penetrated section.

19 . The method of claim 16 , wherein:
winding the inner or outer wire layer includes winding a tight-wound section in which at least one of the inner and outer wire layers is tight wound; and winding the inner or outer wire layer including winding an open-wound section in which at least one of the inner and outer wire layers is open wound, such that the torque coil has increased relative flexibility in the open-wound section and has decreased relative flexibility in the tight-wound section.

20 . The method of claim 16 , wherein:
winding the inner and outer wire layer includes winding a full-wire layer section in which both the inner and outer wire layers are within the full-wire layer section; and winding the inner and outer wire layer includes winding a partial-wire layer section in which the outer wire layer is not within the partial-wire layer section, such that the torque coil has increased relative flexibility in the partial-wire layer section and has decreased relative flexibility in the full-wire layer section.

Assignees

• Heraeus Deutschland Gmbh & Co Kg

Inventors

• Boucher Colin
• Dao Ngac Ba
• Trickey Megan
• Bluhm Shawn D

Classifications

• A61M25/09016 Primary

  with mandrils · CPC title

• A61M2025/09091

  where a sheath surrounds the coil at the distal part · CPC title

• A61M25/0102

  Insertion or introduction using an inner stiffening member, e.g. stylet or push-rod · CPC title

• A61B5/6851

  Guide wires · CPC title

• A61B5/02154

  by optical transmission · CPC title