Wire for removing intravascular foreign body and medical instrument
First Claim
Patent Images
1. A wire for removing an intravascular foreign body comprising:
- a flexible wire body possessing a central axis and a forward end;
a branch part branching out from the forward end of the wire body;
a plurality of filaments, each of the plurality of filaments extending across said branch part;
the branch part and the filaments together forming a capturing space in which is to be captured a foreign body;
the plurality of filaments comprising at least one first filament having opposite ends which are both axially movable relative to the branch part so that a loop formed by the at least one first filament and the branch part changes in size, the first filament lying entirely in a plane when the first filament is in a forward position for capturing the foreign body;
the plurality of filaments also comprising at least one second filament having opposite ends which are both axially non-movable relative to the branch part;
a movable body to which the ends of the at least one filament are connected so that with the foreign body positioned in the capturing space the movable body is movable to axially move the ends of the at least one first filament in a proximal direction relative to the branch part and relative to the at least one second filament to tighten the foreign body in the capturing space by engagement with the at least one first filament; and
a continuation of the central axis of the wire body lying in said plane of the first filament.
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Abstract
A wire for removing an intravascular foreign body comprises a flexible wire body, a branch part branching out from the forward end of the wire body, and a plurality of filaments extending across the branch part. The branch part and the filaments form a space for capturing a foreign body therein. At least one of the filaments is changeable in length so that the loop formed by the filament and the branch part changes in size. The wire is capable of relatively reliably capturing and removing a foreign body in the vessel.
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Citations
31 Claims
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1. A wire for removing an intravascular foreign body comprising:
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a flexible wire body possessing a central axis and a forward end; a branch part branching out from the forward end of the wire body; a plurality of filaments, each of the plurality of filaments extending across said branch part; the branch part and the filaments together forming a capturing space in which is to be captured a foreign body; the plurality of filaments comprising at least one first filament having opposite ends which are both axially movable relative to the branch part so that a loop formed by the at least one first filament and the branch part changes in size, the first filament lying entirely in a plane when the first filament is in a forward position for capturing the foreign body; the plurality of filaments also comprising at least one second filament having opposite ends which are both axially non-movable relative to the branch part; a movable body to which the ends of the at least one filament are connected so that with the foreign body positioned in the capturing space the movable body is movable to axially move the ends of the at least one first filament in a proximal direction relative to the branch part and relative to the at least one second filament to tighten the foreign body in the capturing space by engagement with the at least one first filament; and a continuation of the central axis of the wire body lying in said plane of the first filament. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A wire for removing an intravascular foreign body comprising:
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a flexible wire body possessing a forward end, the wire body having an outer dimension permitting the flexible wire to be positioned in a blood vessel of a living body; two branch wires connected to the forward end of the wire body and extending in a forward direction from the forward end of the flexible wire body; the two branch wires branching outwardly away from one another so that a distance between the two branch wires is greater farther away from the forward end of the wire body than nearer to the wire body; each of the two branch wires having a forward end; a plurality of filaments each of the plurality of filaments extending between the forward ends of the two branch wires; the two branch wires and the filaments together forming a capturing space in which is to be captured a foreign body in the blood vessel, the two branch wires and filaments having outer dimensions permitting placement in the blood vessel of the living body; the two branch wires and at least one of the filaments together forming a loop wire; the at least one filament having opposite ends that are both axially movable relative to the two branch wires to change a peripheral length of the loop wire; the two branch wires both being hollow, one of the ends of the at least one filament being movably positioned within one of the two hollow branch wires and the other end of the at least one filament being movably positioned within the other hollow branch wire; and the plurality of filaments comprises a second filament having opposite ends that are both fixed to and axially non-movable relative to the two branch wires. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A wire for removing an intravascular foreign body comprising:
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a flexible wire body possessing a central axis and a forward end, the wire body having an outer dimension permitting the flexible wire to be positioned in a blood vessel of a living body; a plurality of loop wires connected to the flexible wire body, the loop wires possessing an outer dimension permitting the loop wires to be positioned in the blood vessel of the living body; the loop wires together defining a capturing space in which is to be captured a foreign body in the blood vessel; the first loop wire comprising a branch part connected to the forward end of the wire body and a first filament, the branch part comprising two branch wires branching away from one another, each branch wire having a forward end, the first filament extending between the forward ends of the two branch wires, the second loop wire comprising a second filament extending between the forward ends of the two branch wires; the loop wires comprising at least a first loop wire having opposite ends which are both axially movable relative to the flexible wire body, the first loop wire lying entirely in a plane when the first loop wire is positioned in a forward position for capturing the foreign body; the loop wires also comprising at least a second loop wire having opposite ends which are both axially non-movable relative to the flexible wire body; means connected to the first loop wire for reducing an area enclosed by the first loop wire by moving the first loop wire in a proximal direction relative to the second loop wire so that the foreign body positioned in the capturing space is engaged by the first loop wire and held by the first loop wire; and a continuation of the central axis of the wire body lying in said plane of the first loop wire. - View Dependent Claims (23, 24, 25, 26, 27)
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28. A wire for removing an intravascular foreign body comprising:
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a flexible wire body possessing a forward end, the flexible wire body possessing a hollow interior in which is movably positioned a movable body which is movable relative to the flexible wire body; a branch part branching out from the forward end of the wire body; a plurality of filaments each of the plurality of filaments extending across said branch part; the branch part and the filaments together forming a capturing space in which is to be captured a foreign body; the plurality of filaments comprising at least one first filament having opposite ends and at least one second filament having opposite ends; the branch part comprises two hollow branch wires each possessing a distal end, the two branch wires extending outwardly away from one another in a direction toward the distal ends of the branch wires; both of the hollow branch wires communicating with the hollow interior of the flexible wire body; each of the ends of the first filament being movably positioned in a respective one of the two hollow branch wires so that a loop formed by the first filament and the two branch wires changes in size; each of the ends of the second filament being fixed to a respective one of the two branch wires in an axially non-movable manner so that each end of the second filament is axially non-movable relative to the respective branch wire; each end of the first filament comprising a connecting part that is connected to the movable body so that with the foreign body positioned in the capture space, the movable body is movable relative to the flexible wire body in a proximal direction away from the distal end of each branch wire to cause the ends of the first filament to move in the respective hollow branch wires relative to the ends of the second filament to reduce the size of the loop so that the first filament engages and tightens a hold on the foreign body in the capture space. - View Dependent Claims (29, 30, 31)
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Specification