# US 10,869,673 B2 · Embolic coil with kick-in tail

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- Number: US 10,869,673 B2
- Document ID: US10869673B2
- Status: Granted
- Kind: B2
- Application number: 15/015,820
- Filed: 2016-02-04
- Published: 2016-08-11
- Granted: 2020-12-22
- Earliest claimed: 2015-02-05
- Assignees: Boston Scientific Scimed, Inc.
- Applicants: Boston Scientific Scimed, Inc.
- Inventors: Ken Zhang; Gary Pederson; Katherine Routh; Jeffry Johnson
- Web page: https://patentgrep.com/patent/US10869673B2

## CPC

- A61B 17/12145: {having a pre-set deployed three-dimensional shape (methods of manufacturing A61B2017/00526)}
- A61B 2017/00526: {Methods of manufacturing}
- A61B 2017/00867: {shape memory effect}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

The present disclosure relates to embolic coils that eliminate kick-back into a parent vessel by providing a proximal end that retracts following deployment within the vasculature. Also disclosed are methods of making such coils, delivery systems that comprise such coils, and methods of delivering such coils to a patient.

## Claims

### Claim 1

An embolic coil comprising:
an elongate helical primary shape having a diameter, a first end, a second end, and defining a lumen there along having a volume;
a bend in the first end of the primary shape extending into the volume; and
a secondary shape defining a helix and a terminal end, wherein the entire helix and the terminal end are contained between the bend and the second end.

### Claim 2 (depends on 1)

The embolic coil of claim 1, wherein a bending radius of the bend is less than five times the diameter of the elongate helical primary shape when the coil is in the free energy state.

### Claim 3 (depends on 1)

The embolic coil of claim 1, wherein the first end bends at an angle greater than 360 degrees when the coil is in the free energy state.

### Claim 4 (depends on 1)

The embolic coil of claim 1, wherein the first end comprises a two-dimensional spiral or a three-dimensional spiral when the coil is in the free energy state.

### Claim 5 (depends on 1)

The embolic coil of claim 1, wherein the bend points toward the second end.

### Claim 6 (depends on 1)

The embolic coil of claim 1, wherein the secondary shape defines a lumen therethrough, and wherein the first end of the primary shape is at least partially disposed within the lumen of the primary shape when the coil is in the free energy state.

### Claim 7 (depends on 6)

The embolic coil of claim 6, wherein the secondary shape is substantially in the form of a cylinder which forms the lumen of the secondary shape when the coil is in the free energy state.

### Claim 8 (depends on 1)

The embolic coil of claim 1, wherein the bend is such that a tip of the first end points into the volume when the coil is in the free energy state.

### Claim 9 (depends on 8)

The embolic coil of claim 8, wherein the first end bends at an angle greater than 60 degrees and less than 225 degrees when the coil is in the free energy state.

### Claim 10 (depends on 8)

The embolic coil of claim 8, wherein the secondary shape has a secondary axis and wherein an axis of the primary shape at a tip of the first end is within 45 degrees of parallel to the secondary axis when the coil is in the free energy state.

### Claim 11 (depends on 1)

The embolic coil of claim 1, wherein the volume is a single conic volume, a dual conic volume, or a cylindrical volume.

### Claim 12 (depends on 1)

The embolic coil of claim 1, wherein the first end is provided with an attachment feature.

### Claim 13 (depends on 1)

A delivery sheath containing an embolic coil in accordance with claim 1.

### Claim 14 (depends on 1)

A delivery system comprising (a) an embolic coil in accordance with claim 1 and (b) a delivery wire that is temporarily attached to the embolic coil via an attachment feature.

### Claim 15 (depends on 14)

The delivery systems of claim 14, wherein the embolic coil comprises a first attachment member that is temporarily interlocked with a second attachment member on the delivery wire.

### Claim 16

A method comprising:
(a) advancing an embolic coil of a delivery system to a target occlusion area in a patient, said delivery system comprising:
(i) an embolic coil comprising:
an elongate helical primary shape having a diameter, a first end, a second end, and defining a lumen therealong having a volume;
a bend in the first end of the primary shape extending into the volume; and
a secondary shape defining a helix and a terminal end, wherein the entire helix and the terminal end are contained between the bend and the second end; and
(ii) a delivery wire; and
(b) releasing the embolic coil from the delivery system.

### Claim 17 (depends on 16)

The method of claim 16, wherein the embolic coil and delivery wire are loaded into a sheath and wherein the embolic coil is pushed from the sheath using the delivery wire to release the embolic coil.