# US 2021/0330347 A1 · Tissue-removing catheter with guidewire isolation liner

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- Number: US 2021/0330347 A1
- Document ID: US20210330347A1
- Status: Published application
- Kind: A1
- Application number: 17/366,669
- Filed: 2021-07-02
- Published: 2021-10-28
- Earliest claimed: 2017-05-03
- Assignees: Medtronic Vascular, Inc.
- Applicants: Medtronic Vascular, Inc.
- Inventors: Aram Jamous; John Kelly; Matthew Fleming; Colin William Meade; Grainne Teresa Carroll
- Web page: https://patentgrep.com/patent/US20210330347A1

## 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 17/00234: {for minimally invasive surgery (A61B17/0218, A61B17/0469, A61B17/12013, A61B17/1285, A61B17/29, A61B17/320016 take precedence)}
- A61B 17/32002: {with continuously rotating, oscillating or reciprocating cutting instruments}
- A61B 17/32053: {Punch like cutting instruments, e.g. using a cylindrical or oval knife (A61B17/326 takes precedence; trepans A61B17/1695)}
- A61B 17/320783: {through side-hole, e.g. sliding or rotating cutter inside catheter}
- A61M 25/0082: {Catheter tip comprising a tool}
- A61B 2017/00292: {mounted on or guided by flexible, e.g. catheter-like, means}
- A61B 2017/00398: {using powered actuators, e.g. stepper motors, solenoids}
- A61B 2017/00477: {Coupling (A61B2017/0046 takes precedence)}
- A61B 2017/00738: {part of the tool being offset with respect to a main axis, e.g. for better view for the surgeon}
- A61B 2017/00845: {of moving parts with respect to each other}
- A61B 2017/0088: {ceramic}
- A61B 2017/22001: {Angioplasty, e.g. PCTA}
- A61B 2017/22038: {with a guide wire}
- A61B 2017/320004: {abrasive}
- A61B 2017/320024: {Morcellators, e.g. having a hollow cutting tube with an annular cutter for morcellating and removing tissue}
- A61B 2017/320052: {Guides for cutting instruments}
- A61B 2017/320064: {with tissue or sample retaining means}
- A61B 2017/320741: {for stripping the intima or the internal plaque from a blood vessel, e.g. for endarterectomy}
- A61B 2017/320775: {Morcellators, impeller or propeller like means}
- A61B 2090/0801: {Prevention of accidental cutting or pricking}
- A61M 25/0108: {using radio-opaque or ultrasound markers}
- A61M 2025/0096: {being laterally outward extensions or tools, e.g. hooks or fibres}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)}

## Abstract

A tissue-removing catheter for removing tissue in a body lumen includes an elongate body and a tissue-removing element mounted on a distal end portion of the elongate body. The tissue-removing element is configured to remove the tissue as the tissue-removing element is rotated by the elongate body within the body lumen. An inner liner is received within the elongate body. The inner liner defines a guidewire lumen. The inner liner isolates an interior of the guidewire lumen from the elongate body and tissue-removing element such that rotational forces are not transferred from the elongate body and tissue-removing element to the interior of the guidewire lumen when the elongate body and tissue-removing element are rotated during removal of tissue from the body lumen.

## Claims

### Claim 1

A tissue-removing catheter for removing tissue in a body lumen, the tissue-removing catheter comprising:
an elongate body having an axis and proximal and distal end portions spaced apart from one another along the axis, the elongate body being sized and shaped to be received in the body lumen;
a tissue-removing element mounted on the distal end portion of the elongate body, the tissue-removing element being configured to remove the tissue as the tissue-removing element is rotated by the elongate body within the body lumen;
an inner liner received within the elongate body, the inner liner defining a guidewire lumen, the inner liner isolating an interior of the guidewire lumen from the elongate body and tissue-removing element such that rotational forces are not transferred from the elongate body and tissue-removing element to the interior of the guidewire lumen when the elongate body and tissue-removing element are rotated during removal of tissue from the body lumen; and
an atraumatic tip disposed on a distal end portion of the inner liner, the atraumatic tip being separate from the inner liner and attached to the inner liner.

### Claim 2 (depends on 1)

A tissue-removing catheter as set forth in claim 1, wherein the atraumatic tip defines a soft, low profile distal end to facilitate delivery of the inner liner through the body lumen.

### Claim 3 (depends on 1)

A tissue-removing catheter as set forth in claim 1, wherein the atraumatic tip has a maximum outer diameter of about 0.02 inches (0.6 mm).

### Claim 4 (depends on 1)

A tissue-removing catheter as set forth in claim 1, wherein the inner liner includes an inner layer, an outer layer, and an intermediate layer disposed between the inner and outer layers.

### Claim 5 (depends on 4)

A tissue-removing catheter as set forth in claim 4, wherein the inner layer comprises Polytetrafluorethylene (PTFE), the intermediate layer comprises stainless steel, and the outer layer comprises polyimide.

### Claim 6 (depends on 1)

A tissue-removing catheter as set forth in claim 1, wherein a distal end of the inner liner extends distally of the tissue-removing element.

### Claim 7 (depends on 6)

A tissue-removing catheter as set forth in claim 6, wherein the guidewire lumen extends through the distal end of the inner liner.

### Claim 8 (depends on 1)

A tissue-removing catheter as set forth in claim 1, wherein the atraumatic tip has a tapered distal end.

### Claim 9 (depends on 1)

A tissue-removing catheter as set forth in claim 1, wherein the tissue-removing element comprises an abrasive burr.

### Claim 10 (depends on 1)

A tissue-removing catheter as set forth in claim 1, further comprising a handle mounted on to the proximal end portion of the elongate body and operable to cause rotation of the elongate body.

### Claim 11 (depends on 10)

A tissue-removing catheter as set forth in claim 10, further comprising a motor in the handle, the motor operatively engaging the elongate body for driving rotation of the elongate body and tissue-removing element mounted on the elongate body.

### Claim 12 (depends on 11)

A tissue-removing catheter as set forth in claim 11, further comprising an actuator positioned on the handle and configured to selectively actuate the motor to drive rotation of the elongate body and tissue-removing element.

### Claim 13 (depends on 10)

A tissue-removing catheter as set forth in claim 10, further comprising an advancer mounted on the handle and operatively coupled to the elongate body for moving the elongate body relative to the handle.