Interested in licensing this patent?
MTEC can help explore whether this patent might be available for licensing for your application.
Publication Number
US-11844711-B2
Publication Date
2023-12-19
Expiration Date
Abstract
This covered stent 100, which is released from a sheath 200 and placed in a lumen in a living body, is provided with: a tubular skeleton portion 11 which is stretchable in the axial direction and is expandable in the radial direction substantially perpendicular to the axial direction; and a stretch restriction portion 2 for restricting stretching of the skeleton portion in the axial direction. The stretch restriction portion is formed from a material different from that of the skeleton portion and restricts stretching of the skeleton portion in the axial direction when the skeleton portion is contracted in the radial direction while being stored in the sheath.
Core Innovation
The disclosure relates to a covered stent released from a sheath and placed in a living-body lumen. The stent includes a tubular skeleton portion that is stretchable in an axial direction and both expandable and contractable in a radial direction substantially perpendicular to the axial direction.
To restrict axial stretching, the stent has a stretch restriction portion made of a first material different from a second material of the skeleton portion. The stretch restriction portion is an axial member disposed along the axial direction in a membrane portion, where the member has a width in a circumferential direction less than a circumference of the stent and the width is equal over an entire length of the stretch restriction portion.
The skeleton portion is covered by the membrane portion disposed to cover at least an entire outer surface of the skeleton portion. The stretch restriction portion is positioned at an axial location within the membrane portion, and a portion of the stent in which the stretch restriction portion is disposed protrudes radially outward relative to a portion in which the stretch restriction portion is not disposed.
Claims Coverage
The independent claim is clm-00001. The main inventive features focus on a covered, sheath-releasable stent with an axial skeleton that is radially expandable/contractable and an axial stretch restriction portion formed of a different material and arranged within a membrane so that it protrudes radially outward.
Sheath-released covered stent with axially stretchable, radially expandable/contractable skeleton
A stent that is released from a sheath and placed in a living body lumen, the stent comprising a skeleton portion in a tubular form that is stretchable in an axial direction and both expandable and contractable in a radial direction substantially perpendicular to the axial direction.
Axial stretch restriction portion of different material restricting axial stretching
A stretch restriction portion that restricts axial stretching of the skeleton portion, wherein the stretch restriction portion is an axial member made of a first material different from a second material for the skeleton portion and having a width in a circumferential direction that is less than a circumference of the stent, the width being equal over the entire length of the stretch restriction portion, and the stretch restriction portion is disposed along the axial direction in the membrane portion.
Membrane portion covering the skeleton with radially protruding restriction region
A membrane portion that is disposed so as to cover at least an entire outer surface of the skeleton portion, wherein a portion of the stent in which the stretch restriction portion is disposed protrudes radially outwardly relative to a portion in which the stretch restriction portion is not disposed.
Across the independent claim, coverage is centered on the combination of a sheath-released covered stent with an axial/radial stretchable skeleton and a membrane-integrated axial stretch restriction portion of different material having a specified circumferential width relationship and a constant width along its axial length, arranged so the restriction region protrudes radially outward.
Stated Advantages
Improved sheath release.
Reduced axial contact and retention resistance.
Decreased axial shortening (reduction rate) in the expanded state.
Suppression of additional axial stretching during axial displacement of the sheath.
Documented Applications
Stent placement in a living-body lumen.
Use with a stent to address conditions such as digestive tract/stenosis/occluded site as described in the disclosure.
Interested in licensing this patent?