Stent delivery system
First Claim
Patent Images
1. A stent delivery system comprising:
- an inner member;
a sheath that is arranged outside the inner member so as to be movable in an axial direction with respect to the inner member;
a self-expandable stent that is arranged between the inner member and the sheath;
a grip that includes a movement mechanism for moving the sheath in the axial direction with respect to the inner member,wherein the stent is contained in the sheath in an initial state, and the stent is configured to be released inside a living body lumen in accordance with a movement of the sheath in a proximal direction with respect to the inner member, andwherein the movement mechanism has a displacement member which is connected to the sheath, wherein the displacement member is movable along the axial direction of the stent delivery system and extends in the axial direction; and
a plurality of driving rotators which are arranged at intervals from each other in an extension direction of the displacement member, and move the displacement member in the extension direction in accordance with rotations of the plurality of driving rotators, and wherein the plurality of driving rotators are three or more.
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Abstract
A stent delivery system is disclosed in which a stent is contained in a sheath in an initial state and the stent is released inside a living body lumen in accordance with a movement of the sheath in a proximal direction with respect to an inner member. A movement mechanism of the stent delivery system has a rack member which is connected to a proximal end of the sheath, and a plurality of pinions which move the rack member in accordance with rotations thereof.
59 Citations
20 Claims
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1. A stent delivery system comprising:
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an inner member; a sheath that is arranged outside the inner member so as to be movable in an axial direction with respect to the inner member; a self-expandable stent that is arranged between the inner member and the sheath; a grip that includes a movement mechanism for moving the sheath in the axial direction with respect to the inner member, wherein the stent is contained in the sheath in an initial state, and the stent is configured to be released inside a living body lumen in accordance with a movement of the sheath in a proximal direction with respect to the inner member, and wherein the movement mechanism has a displacement member which is connected to the sheath, wherein the displacement member is movable along the axial direction of the stent delivery system and extends in the axial direction; and a plurality of driving rotators which are arranged at intervals from each other in an extension direction of the displacement member, and move the displacement member in the extension direction in accordance with rotations of the plurality of driving rotators, and wherein the plurality of driving rotators are three or more. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A stent delivery system comprising:
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an inner member; a sheath that is arranged outside the inner member so as to be movable in an axial direction with respect to the inner member; a self-expandable stent that is arranged between the inner member and the sheath; a grip that includes a movement mechanism for moving the sheath in the axial direction with respect to the inner member, wherein the stent is contained in the sheath in an initial state, and the stent is configured to be released inside a living body lumen in accordance with a movement of the sheath in a proximal direction with respect to the inner member, and wherein the movement mechanism has a displacement member which is connected to the sheath, wherein the displacement member is movable along the axial direction of the stent delivery system and extends in the axial direction; a plurality of driving rotators which are arranged at intervals from each other in an extension direction of the displacement member, and move the displacement member in the extension direction in accordance with rotations of the plurality of driving rotators; an interlocking mechanism that interlocks the plurality of driving rotators with each other; and a rotative operation portion that rotates the plurality of driving rotators via the interlocking mechanism, wherein the plurality of driving rotators include a plurality of first driving rotators and a plurality of second driving rotators, wherein at least one of the plurality of first driving rotators and at least one of the plurality of second driving rotators are configured to drive the displacement member within a movable range of the displacement member, wherein the interlocking mechanism has a first interlocking portion which interlocks the plurality of first driving rotators with each other, and a second interlocking portion which interlocks the plurality of second driving rotators with each other, and wherein a movement distance per unit rotation angle of each of the plurality of first driving rotators in the displacement member is different from a movement distance per unit rotation angle of each of the plurality of second driving rotators in the displacement member. - View Dependent Claims (10, 11, 12)
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13. A stent delivery system comprising:
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an inner member; a sheath that is arranged outside the inner member so as to be movable in an axial direction with respect to the inner member; a self-expandable stent that is arranged between the inner member and the sheath; a grip that includes a movement mechanism for moving the sheath in the axial direction with respect to the inner member, wherein the stent is contained in the sheath in an initial state, and the stent is configured to be released inside a living body lumen in accordance with a movement of the sheath in a proximal direction with respect to the inner member, and wherein the movement mechanism has a displacement member which is connected to the sheath, wherein the displacement member is movable along the axial direction of the stent delivery system and extends in the axial direction; and a plurality of driving rotators which are arranged at intervals from each other in an extension direction of the displacement member, and move the displacement member in the extension direction in accordance with rotations of the plurality of driving rotators, wherein the plurality of driving rotators include a plurality of first driving rotators and a plurality of second driving rotators, wherein at least one of the plurality of first driving rotators and at least one of the plurality of second driving rotators are able to drive the displacement member at all times within a movable range of the displacement member, and wherein a movement distance per unit rotation angle of each of the plurality of first driving rotators in the displacement member is different from a movement distance per unit rotation angle of each of the plurality of second driving rotators in the displacement member. - View Dependent Claims (14, 15)
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16. A stent delivery system comprising:
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an inner member; a sheath that is arranged outside the inner member so as to be movable in an axial direction with respect to the inner member; a self-expandable stent that is arranged between the inner member and the sheath; a grip that includes a movement mechanism for moving the sheath in the axial direction with respect to the inner member, wherein the stent is contained in the sheath in an initial state, and the stent is configured to be released inside a living body lumen in accordance with a movement of the sheath in a proximal direction with respect to the inner member, and wherein the movement mechanism has a displacement member which is connected to the sheath, wherein the displacement member is movable along the axial direction of the stent delivery system and extends in the axial direction; and a plurality of driving rotators which are arranged at intervals from each other in an extension direction of the displacement member, and move the displacement member in the extension direction in accordance with rotations of the plurality of driving rotators, wherein a movement distance per unit rotation angle of the driving rotator provided on a farthest proximal side in the displacement member is greater than a movement distance per unit rotation angle of the driving rotator provided on a farthest distal side in the displacement member. - View Dependent Claims (17, 18, 19, 20)
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Specification