# US 11,076,972 B2 · Delivery of medical devices

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- Number: US 11,076,972 B2
- Document ID: US11076972B2
- Status: Granted
- Kind: B2
- Application number: 16/033,027
- Filed: 2018-07-11
- Published: 2018-11-08
- Granted: 2021-08-03
- Earliest claimed: 2013-08-27
- Assignees: Covidien LP
- Applicants: Covidien LP
- Inventors: Ashok Nageswaran; Michael Losordo; Gabriel Newell; Lawrence Farhat
- Web page: https://patentgrep.com/patent/US11076972B2

## CPC

- A61F 2/966: with relative longitudinal movement between outer sleeve and prosthesis, e.g. using a push rod
- A61F 2/82: Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents (stent-grafts for tubular structures of the body other than blood vessels A61F2/04; stent-grafts for blood vessels A61F2/07)
- A61F 2/86: Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
- A61F 2/90: characterised by a net-like or mesh-like structure
- A61F 2/92: Stents in the form of a rolled-up sheet expanding after insertion into the vessel {, e.g. with a spiral shape in cross-section}
- A61F 2/95: Instruments specially adapted for placement or removal of stents or stent-grafts
- A61F 2/958: Inflatable balloons for placing stents or stent-grafts
- A61F 2/962: having an outer sleeve
- A61F 2/97: the outer sleeve being splittable
- A61M 25/0053: {having a variable stiffness along the longitudinal axis, e.g. by varying the pitch of the coil or braid}
- A61M 25/008: {Strength or flexibility characteristics of the catheter tip}
- A61F 2002/823: {Stents, different from stent-grafts, adapted to cover an aneurysm}
- A61F 2002/9505: {having retaining means other than an outer sleeve, e.g. male-female connector between stent and instrument}
- A61F 2002/9528: {for retrieval of stents}
- A61F 2230/0091: helically-coiled or spirally-coiled, i.e. having a 2-D spiral cross-section
- A61F 2250/0018: differing in elasticity, stiffness or compressibility
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)
- 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 stent delivery system can include a core member, an introducer sheath, and a microcatheter. The core member can have a distal segment. The stent engagement member can have a generally tubular body positioned about the core member distal segment and can be rotatably coupled to the core member. The engagement member can include an inner layer that has a first durometer and an outer layer that has a second durometer less than the first durometer. The stent can extend along the core member distal segment such that an inner surface of the stent is engaged by the engagement member outer layer for facilitating rotation of the stent relative to the core member.

## Claims

### Claim 1

A stent delivery system, comprising:
a core member having a distal segment;
a first stent engagement member positioned along the core member distal segment and coupled to the core member, the first engagement member comprising an outer surface comprising a plurality of outwardly projecting protrusions separated by recesses;
a proximal restraint coupled to the core member at a position proximal to the first engagement member;
a distal restraint coupled to the core member at a position distal to the first engagement member, wherein the distal restraint has a cross-sectional profile that tapers in the distal direction, wherein the first engagement member is longitudinally slidable over at least a portion of a distance between the proximal restraint and the distal restraint;
a third restraint disposed proximal to the first engagement member and distal to the proximal restraint;
a second stent engagement member coupled to the core member and positioned between the proximal restraint and the third restraint, wherein the second stent engagement member is longitudinally slidable over at least a portion of a distance between the proximal restraint and the third restraint; and
a stent extending along the core member distal segment such that an inner surface of the stent is engaged by the first engagement member outer surface for facilitating rotation of the stent relative to the core member.

### Claim 2 (depends on 1)

The system of claim 1, wherein the protrusions and recesses extend longitudinally.

### Claim 3 (depends on 1)

The system of claim 1, wherein the first engagement member is rotatably coupled to the core member, for permitting rotational movement of the first engagement member relative to the core member.

### Claim 4 (depends on 1)

The system of claim 1, wherein the proximal restraint has a smaller cross-sectional profile than the first engagement member.

### Claim 5 (depends on 1)

The system of claim 1, wherein the first engagement member abuts the proximal restraint to limit proximal movement of the stent engagement member.

### Claim 6 (depends on 1)

The system of claim 1, wherein the first engagement member has an axial length of less than 3 mm.

### Claim 7 (depends on 1)

The system of claim 1, wherein the first engagement member has an overall outside diameter of between about 0.02275″-0.02500″.

### Claim 8 (depends on 1)

The system of claim 1, wherein the engagement member outer surface engages the inner surface of the stent at a position spaced apart from a proximal end of the stent.

### Claim 9

A stent delivery system, comprising:
a core member having a distal segment configured to receive a stent thereon;
a proximal restraint coupled to the core member at a position proximal to the distal segment;
a distal restraint coupled to the core member at a position distal to the proximal restraint and spaced apart from the distal restraint by a distance, wherein the distal restraint has a cross-sectional profile that tapers in the distal direction;
a first stent engagement member positioned along the core member distal segment at a position between the proximal restraint and the distal restraint, the first engagement member rotatably and slidably coupled to the core member and comprising an outer surface including a plurality of ridges alternating with recessed portions,
a third restraint disposed proximal to the first engagement member and distal to the proximal restraint; and
a second stent engagement member coupled to the core member at a position between the proximal restraint and the third restraint, wherein the second stent engagement member is longitudinally slidable over at least a portion of a distance between the proximal restraint and the third restraint.

### Claim 10 (depends on 9)

The system of claim 9, wherein the plurality of ridges and recessed portions extend longitudinally.

### Claim 11 (depends on 9)

The system of claim 9, wherein the first engagement member is rotatably coupled to the core member, for permitting rotational movement of the first engagement member relative to the core member.

### Claim 12 (depends on 9)

The system of claim 9, wherein the proximal restraint has a smaller cross-sectional profile than the first engagement member.

### Claim 13 (depends on 9)

The system of claim 9, wherein the first engagement member abuts the proximal restraint to limit proximal movement of the first engagement member.

### Claim 14 (depends on 9)

The system of claim 9, wherein the first engagement member has an axial length of less than 3 mm.

### Claim 15 (depends on 9)

The system of claim 9, wherein the first engagement member has an overall outside diameter of between about 0.02275″-0.02500″.

### Claim 16 (depends on 9)

The system of claim 9, wherein the first engagement member outer surface engages the inner surface of the stent at a position spaced apart from a proximal end of the stent.