STENT DELIVERY SYSTEM
First Claim
1. A stent delivery system comprising:
- an inner tube;
a stent which is compressed toward a center axis and disposed on a distal side of the inner tube during insertion into a lumen of a living body, and which can be restored to a pre-compression shape by expanding outward when put indwelling in the lumen of the living body;
an outer tube which is disposed on an outer surface side of the inner tube, the outer tube containing the stent, and movable relative to the inner tube and the stent to release the stent by moving proximally relative to the inner tube; and
an operating unit operable by an operator to move the outer tube in an axial direction relative to the inner tube,wherein the operating unit includesa rotary body configured to be rotated by an operation performed by the operator,a displacement body connected to the outer tube and movable in the axial direction, anda speed change mechanism which is provided between the rotary body and the displacement body and changes a speed of the rotation of the rotary body, thereby changing a moving speed of the displacement body by transmitting the rotation to the displacement body, andwherein the speed change mechanism includesa speed change portion which is rotated together with the rotary body and of which the diameter is changed continuously or gradually along rotary shafts of the rotary body, anda transmission portion which is provided on the displacement body and which is meshed with or is in sliding contact with the speed change portion.
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Accused Products
Abstract
An operating unit constituting a stent delivery system is provided with a first rotary roller having a first gear and a second rotary roller having a second gear. The first gear is meshed with a first tooth portion of a rack member and the second gear is meshed with a second tooth portion of the rack member. The first gear is formed to have a large diameter relative to the second gear and at the time of releasing a stent, after positioning a distal end of an outer tube body close to the stent through the rack member with the rotation of the first rotary roller of the operating unit, it is possible to move the outer tube body toward a proximal side at a lower speed than that in the previous state with the rotation of the second rotary roller.
31 Citations
14 Claims
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1. A stent delivery system comprising:
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an inner tube; a stent which is compressed toward a center axis and disposed on a distal side of the inner tube during insertion into a lumen of a living body, and which can be restored to a pre-compression shape by expanding outward when put indwelling in the lumen of the living body; an outer tube which is disposed on an outer surface side of the inner tube, the outer tube containing the stent, and movable relative to the inner tube and the stent to release the stent by moving proximally relative to the inner tube; and an operating unit operable by an operator to move the outer tube in an axial direction relative to the inner tube, wherein the operating unit includes a rotary body configured to be rotated by an operation performed by the operator, a displacement body connected to the outer tube and movable in the axial direction, and a speed change mechanism which is provided between the rotary body and the displacement body and changes a speed of the rotation of the rotary body, thereby changing a moving speed of the displacement body by transmitting the rotation to the displacement body, and wherein the speed change mechanism includes a speed change portion which is rotated together with the rotary body and of which the diameter is changed continuously or gradually along rotary shafts of the rotary body, and a transmission portion which is provided on the displacement body and which is meshed with or is in sliding contact with the speed change portion. - View Dependent Claims (2, 3, 4, 5)
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6. A stent delivery system comprising:
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an inner tube possessing an outer surface, a proximal end and a distal end portion; an outer tube possessing an inner surface, a proximal end and a distal end portion; a collapsed stent positioned between the outer surface of the distal end portion of the inner tube and the inner surface of the distal end portion of the outer tube, the stent being configured to expand radially outwardly from the collapsed state when the outer tube is axially moved in a proximal direction relative to the inner tube; an operating unit operably connected to the outer tube and configured to move the outer tube proximally in an axial direction relative to the inner tube; the operating unit including a rotary body, a displacement body, and a speed change mechanism operably mounted on a rotary shaft; the rotary body being configured to be rotated; the displacement body being connected to the outer tube, being axially movable, and being operatively connected to the speed change mechanism; the rotary shaft extending in a direction orthogonal to an axial dimension of the outer tube; the speed change mechanism extending along a length of the rotary shaft, the speed change mechanism including a first portion and a second portion spaced apart from each other along the rotary shaft; the first portion of the speed change mechanism having a first outer diameter, and the second portion of the speed change mechanism having a second outer diameter different from the first outer diameter; the speed change mechanism being positioned between the rotary body and the displacement body and being configured to transmit the rotation of the rotary body to the displacement body to axially move the displacement body. - View Dependent Claims (7, 8, 9, 10)
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11. A method for using a stent delivery system, the stent delivery system including an inner tube possessing an outer surface and a distal end portion, an outer tube possessing an inner surface and a distal end portion, a collapsed stent positioned between the outer surface of the distal end portion of the inner tube and the inner surface of the distal end portion of the outer tube, the stent being configured to expand radially outwardly from the collapsed state when the outer tube is axially moved in a proximal direction relative to the inner tube, at least one rotary body operably connected to the outer tube and configured to move the outer tube proximally in an axial direction relative to the inner tube, the method comprising:
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rotating the at least one rotary body at a first rotational speed to axially move the outer tube in a proximal direction relative to the inner tube at a first linear speed to position a distal end of the outer tube to a vicinity of the stent; rotating the at least one rotary body at the first rotational speed to axially move the outer tube in the proximal direction relative to the inner tube at a second linear speed different from the first linear speed to expose the stent. - View Dependent Claims (12, 13, 14)
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Specification