# US 9,517,149 B2 · Biodegradable stent with enhanced fracture toughness

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- Number: US 9,517,149 B2
- Document ID: US9517149B2
- Status: Granted
- Kind: B2
- Application number: 13/998,199
- Filed: 2013-10-09
- Published: 2014-04-17
- Granted: 2016-12-13
- Earliest claimed: 2004-07-26
- Assignees: Abbott Cardiovascular Systems Inc.
- Applicants: Abbott Cardiovascular Systems Inc.
- Inventors: David C. Gale; Bin Huang; Stephen Schaible
- Web page: https://patentgrep.com/patent/US9517149B2

## CPC

- A61F 2/90: characterised by a net-like or mesh-like structure
- 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 2/91: made from perforated sheets or tubes, e.g. perforated by laser cuts or etched holes
- A61F 2/915: with bands having a meander structure, adjacent bands being connected to each other
- A61L 31/06: obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds {(A61L31/041 takes precedence)}
- A61L 31/14: Materials characterised by their function or physical properties {, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials}
- B29C 49/0005: {characterised by the material}
- B29C 55/24: radial
- B29C 69/001: {a shaping technique combined with cutting, e.g. in parts or slices combined with rearranging and joining the cut parts (for reinforced material B29C70/545; B29C49/4278, B29C51/268 take precedence)}
- A61F 2/9522: {Means for mounting a stent or stent-graft onto or into a placement instrument}
- A61F 2002/91533: {characterised by the phase between adjacent bands}
- A61F 2002/91558: {connected peak to peak}
- A61F 2002/91566: {connected trough to trough}
- A61F 2002/91575: {connected peak to trough}
- B29C 35/045: {using gas or flames}
- B29C 49/14: Clamps
- B29C 49/4823: {with incorporated heating or cooling means}
- B29C 2049/7831: {characterised by pressure values or ranges}
- B29C 2793/0009: Cutting out
- B29C 2949/08: Preforms made of several individual parts, e.g. by welding or gluing parts together
- B29K 2067/00: Use of polyesters {or derivatives thereof}, as moulding material
- B29K 2067/046: {PLA, i.e. polylactic acid or polylactide}
- B29K 2105/258: {Tubular}
- B29K 2995/006: Bio-degradable, e.g. bioabsorbable, bioresorbable or bioerodible
- B29L 2031/7534: {Cardiovascular protheses}
- 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)
- A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K)
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES

## Abstract

Stents and methods of manufacturing a stents with enhanced fracture toughness are disclosed.

## Claims

### Claim 1

A biodegradable stent comprising:
a scaffold including struts comprising a poly(L-lactide)-based biodegradable polymer, wherein the struts have a luminal surface and an abluminal surface, wherein the polymer has induced polymer orientation in a circumferential direction, and wherein the induced polymer orientation decreases from the luminal surface to the abluminal surface of the struts, wherein the polymer has the induced polymer orientation in a radial section between the luminal surface and a transition radial distance and no induced polymer orientation between the transition radial distance and the abluminal surface, and wherein the transition radial distance is ⅓ to ½ of a radial thickness of the struts.

### Claim 2 (depends on 1)

The stent of claim 1, wherein the scaffold is formed by cutting a pattern in a radially expanded tube having the induced polymer orientation that was induced by radially expanding the tube.

### Claim 3 (depends on 1)

The stent of claim 1, wherein a degree of the induced polymer orientation is uniform around a circumference of the scaffold.

### Claim 4

A biodegradable stent comprising:
a scaffold including struts comprising a poly(L-lactide)-based biodegradable polymer, wherein the struts have a luminal surface and an abluminal surface, and wherein a luminal radial section of the struts exhibits birefringence and an abluminal radial section is optically isotropic when viewed with polarized light, wherein the luminal radial section has a thickness that is ⅓ to ½ of a radial thickness of the struts from the luminal surface to the abluminal surface.