Catheter for removing foreign body in blood vessel
Inventors
Assignees
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Publication Number
US-11426192-B2
Publication Date
2022-08-30
Expiration Date
Abstract
A capturing unit provided on a distal end of a second tube can be deformed into a contracted state and an expanded state, in which the capturing unit is deployed to form a capturing chamber. The capturing chamber has an opening area decreased as it goes from a distal end opening of the capturing chamber toward a proximal end opening of the capturing chamber. A third tube rotatable relative to the second tube and a cutting unit provided on a distal end of the third tube for cutting a foreign substance are arranged in a second lumen. In the expanded state of the capturing unit, the cutting unit is arranged more toward the proximal end opening of the capturing chamber than the distal end opening.
Core Innovation
The invention relates to a blood-vessel catheter for removing a foreign substance, including a tube configured to be inserted in the blood vessel and a capturing unit provided on a distal end of the tube. The capturing unit is radially expandable and is guided into the blood vessel through the tube to capture the foreign substance, and a guide unit is configured to guide the foreign substance toward the capturing unit, the guide unit comprising wire members convex toward a wall of the blood vessel when placed inside the blood vessel.
The capturing unit forms a capturing chamber in an expanded state, where an opening area is decreased as it goes from a distal end opening toward a proximal end opening. The capturing unit includes a plurality of frame portions and a plurality of sheet portions, alternatively arranged around an axis centered on a tube axis, and each frame portion has a same shape and is arranged circumferentially at a constant regularity, with each frame portion including a protrusion provided only on an inner side of the capturing unit.
In a contracted state, distal end sides of the plurality of frame portions are gathered in a circumference shape and the sheet portions are folded on only an outer side of the capturing unit. In the expanded state, the sheet portions cover between adjacent frame portions in a membrane shape, and the protrusions extend in an axial direction from a proximal end to a distal end of the capturing unit.
Claims Coverage
The independent claim specifies a blood-vessel foreign-substance catheter with a radially expandable distal capturing unit forming a tapered capturing chamber, and a guide unit with convex wire members to direct the foreign substance toward the capturing unit. The independent claim’s core structure includes alternating frame portions and sheet portions, with defined contracted and expanded geometries and an inner-side protrusion arrangement; dependent claims further add specific configurations of the capturing unit and the guide unit.
Radially expandable distal capturing unit forming a capturing chamber with decreased opening area
A capturing unit on a distal end of the tube that is radially expandable and forms a capturing chamber whose opening area is decreased from a distal end opening toward a proximal end opening in an expanded state.
Guide unit with convex wire members for directing foreign substance toward the capturing unit
A guide unit configured to guide a foreign substance between the guide unit and the capturing unit toward the capturing unit, the guide unit comprising wire members each convex toward a wall of the blood vessel when placed inside the blood vessel.
Alternating frame portions and sheet portions defining membrane coverage in expanded state
A capturing unit including a plurality of frame portions and a plurality of sheet portions alternatively arranged around an axis centered on a tube axis, wherein in the expanded state the plurality of sheet portions cover between adjacent frame portions in a membrane shape.
Circumferentially regular frame portions with inner-side protrusions and same shape
Each of the plurality of frame portions has a same shape and is arranged circumferentially at a constant regularity, and each frame portion includes a protrusion provided only on an inner side of the capturing unit.
Contracted-state gathering of frame portion distal ends with outer-side folding of sheet portions
In a contracted state, distal end sides of the plurality of frame portions are gathered in a circumference shape and the sheet portions are folded on only an outer side of the capturing unit.
Axial protrusions extending from proximal to distal ends of the capturing unit
Each protrusion extends in the axial direction from a proximal end to a distal end of the capturing unit.
Across the claim set, the inventive coverage is directed to the combination of a tube-delivered, radially expandable capturing unit with a capturing chamber having a decreased distal-to-proximal opening area and a guide unit that uses convex wire members to direct a foreign substance into the capturing chamber. The capturing unit’s specific alternating frame/sheet structure, inner-side protrusions, and defined contracted versus expanded geometry establish the core functional shape behavior stated in the independent claim.
Stated Advantages
Not explicitly described in patent.
Documented Applications
Not explicitly described in patent.
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