Partially biodegradable stent
Inventors
Shin, Kyong-Min • Myung, Byung Cheol • Won, Yong-Hyuni • Kim, Tae-Won
Assignees
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Publication Number
US-8814927-B2
Publication Date
2014-08-26
Expiration Date
Abstract
A partially biodegradable stent includes a main net body of hollow cylindrical shape formed of elastically deformable wires interlaced with each other, the net body extending in a longitudinal direction and terminating at open opposite ends, and an auxiliary net portion provided at one of the open opposite ends of the main net body, the auxiliary net portion formed of a biodegradable wire which can be degraded and removed by a bodily fluid. The auxiliary net portion is formed by interlacing the biodegradable wire into a cylindrical shape independently of the main net body or by interlacing the biodegradable wire with the elastically deformable wires at one of the open opposite ends of the main net body.
Core Innovation
The invention relates to a partially biodegradable stent comprising a main net body of hollow cylindrical shape formed of elastically deformable wires interlaced in a predetermined pattern. The main net body extends in a longitudinal direction and terminates at open opposite ends, and an auxiliary net portion is provided at one of the open opposite ends of the main net body.
The auxiliary net portion is formed of a biodegradable wire interlaced in the predetermined pattern and can be degraded and removed by a bodily fluid. In this design, the auxiliary net portion is formed by interlacing the biodegradable wire into a cylindrical shape independently of the main net body, and the stent further includes a binding wire for tying the main net body and the auxiliary net portion together.
The auxiliary net portion can have a diameter that is tapered relative to the main net body, including a diameter gradually increasing away from the main net body or a diameter gradually decreasing away from the main net body. The elastically deformable wires can be made of a shape-memory alloy, and the biodegradable wire can be made from a biodegradable polymer selected from a specified group.
Claims Coverage
The claims cover three main inventive features: a hollow cylindrical main net body of elastically deformable interlaced wires, an auxiliary biodegradable net portion at an open end that is degradable and removable by bodily fluid, and formation and connection features including independent interlacing and a binding wire.
Interlaced hollow cylindrical main net body with open ends
A main net body of hollow cylindrical shape formed of elastically deformable wires interlaced in a predetermined pattern, the net body extending in a longitudinal direction and terminating at open opposite ends.
Auxiliary biodegradable net portion degradable and removable by bodily fluid
An auxiliary net portion provided at one of the open opposite ends of the main net body, the auxiliary net portion formed of a biodegradable wire interlaced in the predetermined pattern, which can be degraded and removed by a bodily fluid.
Independent interlaced cylindrical auxiliary formation and binding wire connection
The auxiliary net portion is formed by interlacing the biodegradable wire into a cylindrical shape independently of the main net body, and the stent further comprises a binding wire for tying the main net body and the auxiliary net portion together.
Tapered diameter auxiliary net portion
The auxiliary net portion has a diameter gradually becoming larger away from the main net body or, alternatively, a diameter gradually decreasing away from the main net body.
Shape-memory alloy for elastically deformable wires and specified biodegradable polymers
The elastically deformable wires are made of a shape-memory alloy, and the biodegradable wire is made of a biodegradable polymer selected from the listed group.
The claims cover a partially biodegradable stent combining an elastically deformable interlaced hollow cylindrical main net body with an independently formed, biodegradable auxiliary net portion at an open end that is degradable and removable by bodily fluid, with the auxiliary and main portions tied using a binding wire. The claims further specify optional taper geometry and limit material choices for the elastically deformable wires and biodegradable wire.
Stated Advantages
Provides an auxiliary net portion that can be degraded and removed by bodily fluid, so it can be removed while the main net body remains.
Documented Applications
Biliary stent context including bile duct drainage and positioning to protrude into the duodenum.
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