# US 11,432,840 B2 · Rotational systems comprising a polymer driveshaft

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- Number: US 11,432,840 B2
- Document ID: US11432840B2
- Status: Granted
- Kind: B2
- Application number: 16/363,080
- Filed: 2019-03-25
- Published: 2019-07-18
- Granted: 2022-09-06
- Earliest claimed: 2015-06-01
- Assignees: Cardiovascular Systems, Inc.
- Applicants: Cardiovascular Systems, Inc.
- Inventors: Preston L. Grothe; Matthew D. Cambronne; Joseph P. Higgins; William F. Kuester, III; Benjamin Haselman; Joshua J. Cranston; Ric A. Gould; Nicholas W. Rydberg
- Web page: https://patentgrep.com/patent/US11432840B2

## CPC

- A61B 17/320758: {with a rotating cutting instrument, e.g. motor driven (A61B17/320725, A61B17/32075 and A61B17/320783 take precedence; for removing intra-ocular material A61F9/00763; endoscopic rotatable cutting instruments A61B17/32002)}
- A61B 2017/0084: {low friction (A61B2017/00853 takes precedence)}
- A61B 2017/320004: {abrasive}
- A61B 2017/320032: {Details of the rotating or oscillating shaft, e.g. using a flexible shaft}
- A61B 2017/320766: {eccentric}
- A61B 2090/3966: {Radiopaque markers visible in an X-ray image}
- A61B 2217/007: with irrigation system
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

Various embodiments of devices and systems comprising a polymer driveshaft for use in high-speed rotational medical procedures, e.g., atherectomy, are disclosed. Generally, the primary driveshaft for transferring torque and activating rotation of a tool attached thereto, e.g., an abrasive element, is constructed with at least a polymer outer and inner surface. In certain embodiments, the polymer driveshaft may comprise a metallic band for fixed attachment of a structure, e.g., an abrasive element, thereto. Various embodiments may comprise a coupler that connects a drive shaft connected with a prime mover, e.g., a turbine or electric motor, with the polymer drive shaft, the coupler comprising openings through the coupler wall to the inner diameter of the coupler to allow fluid flow to the inner diameter of the coupled polymer drive shaft.

## Claims

### Claim 1

A flexible drive shaft for a rotational atherectomy device
the flexible drive shaft comprising:
a metallic coil defining a lumen therethrough;
an outer polymer layer surrounding the metallic coil,
wherein the outer polymer layer is adapted to add spring constant value to the drive shaft and reduce at least one of longitudinal elongation and jumping of the metallic coil during high-speed rotation of the flexible drive shaft; and
a marker band comprising a wall and wherein the marker band is partially embedded within the outer polymer layer.

### Claim 2 (depends on 1)

The rotational atherectomy device of claim 1, wherein the flexible drive shaft further comprises an inner polymer layer disposed within the lumen of the metallic coil, the inner polymer layer comprising a different polymer than the outer polymer layer and defining an axial lumen therethrough and an inner surface that is generally smooth and continuous.

### Claim 3 (depends on 2)

The rotational atherectomy system of claim 2, further comprising a marker band comprising a wall and fixedly attached to, and at least partially surrounding, the metallic coil.

### Claim 4 (depends on 3)

The rotational atherectomy system of claim 3, further comprising a tool fixedly attached to the marker band.

### Claim 5 (depends on 4)

The rotational atherectomy system of claim 4, wherein the tool comprises an abrasive element.

### Claim 6 (depends on 3)

The rotational atherectomy system of claim 3, the marker band further comprising at least one perforation through the wall of the marker band.

### Claim 7 (depends on 1)

The rotational atherectomy system of claim 1, further comprising a tool fixedly attached to the marker band.

### Claim 8 (depends on 7)

The rotational atherectomy system of claim 7, wherein the tool comprises an abrasive element.

### Claim 9 (depends on 1)

The rotational atherectomy system of claim 1, the marker band further comprising at least one perforation through the wall of the marker band.

### Claim 10 (depends on 1)

The rotational atherectomy system of claim 1, further comprising a coupler in operational attachment with the flexible drive shaft, the coupler comprising a wall and an axial lumen, wherein the coupler further comprises at least one opening through the coupler wall.

### Claim 11 (depends on 1)

The rotational atherectomy device of claim 1, wherein the outer polymer layer is coupled to the metallic coil such that the outer polymer layer and the metallic coil rotate together during high-speed rotation of the flexible drive shaft.

### Claim 12

A drive shaft for a rotational device, comprising:
a metallic coil defining a lumen therethrough;
an outer polymer layer surrounding the metallic coil,
an inner polymer layer disposed within the lumen of the metallic coil, the inner polymer layer comprising a different polymer than the outer polymer layer and defining an axial lumen therethrough and an inner surface that is generally smooth and continuous;
wherein the polymer layers are adapted to add spring constant value to the drive shaft and reduce at least one of longitudinal elongation and jumping of the metallic coil during high-speed rotation of the flexible drive shaft.

### Claim 13 (depends on 12)

The drive shaft of claim 12, wherein the outer polymer layer is coupled to the metallic coil such that the outer polymer layer and the metallic coil rotate together during high-speed rotation of the drive shaft.