Indwelling device and cylindrical treatment tool
Inventors
Assignees
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Publication Number
US-11471310-B2
Publication Date
2022-10-18
Expiration Date
Abstract
An indwelling device 1 is provided with: a sheath 20 that is capable of housing a stent graft 10; and a long shaft 30 that is configured to be capable of advancing or retreating inside the sheath along the axial direction. The shaft has a fixing tool 34 and a hollow tube 35 that are respectively engaged with a connection part 14 and a blood vessel wall fixing part 15 of the stent graft to restrict movement of an opening end 11a of the stent graft in the radial direction. The indwelling device is configured to be capable of releasing engagement between the connection part and the fixing tool and engagement between the blood vessel wall fixing part and the hollow tube independently of each other by displacing the shaft with respect to the stent graft in the axial direction.
Core Innovation
The invention relates to an indwelling device that causes a cylindrical treatment tool, which is radially expandable, to indwell a living body lumen. The indwelling device includes a sheath in a tubular shape capable of housing the cylindrical treatment tool, and an elongated shaft member sized and shaped to move back and forth inside the sheath along the axial direction of the sheath. The elongated shaft member has first and second controlling parts formed one after another along the axial direction, each engaging a first engaging part and a second engaging part provided at one end of the cylindrical treatment tool in the axial direction, respectively, to control radial movement of an opening end of the cylindrical treatment tool.
The elongated shaft member is displaced relative to the cylindrical treatment tool in one direction along the axial direction to allow release of a first engagement between the first controlling part and the first engaging part. The elongated shaft member is further displaced relative to the cylindrical treatment tool in a direction other than the one direction along the axial direction to allow release of a second engagement between the second controlling part and the second engaging part to be released independently of each other. This structure enables controlling radial movement of the opening end by independently releasing first and second engagements based on the shaft displacement in different axial directions.
In the disclosed indwelling device, the engagements at the cylindrical treatment tool opening end are released independently in sequence by using the first and second controlling parts on a single elongated shaft member. The described configuration allows radial expansion of the opening end at a first stage while maintaining another engagement during the first-direction displacement by a structure corresponding to a hollow part of the controlling part. A later stage enables release of the remaining engagement so that fixing to the living body lumen inner wall can be performed using a fixing pin included in the engaging parts. The disclosed sheath/shaft arrangement is directed to reducing complexity and invasiveness by avoiding dual-shaft complexity and using a smaller-diameter sheath design.
Claims Coverage
The independent claims are clm-00001 and clm-00008. Together, they define an indwelling device and a corresponding cylindrical treatment tool where first and second engagements are released independently by relative displacement of an elongated shaft member along different axial directions, with radial movement of an opening end controlled by first and second controlling parts engaging first and second engaging parts.
Axially movable shaft with first and second controlling parts for independent engagement release
An indwelling device comprising a tubular sheath and an elongated shaft member movable back and forth inside the sheath along an axial direction, wherein the elongated shaft member has first and second controlling parts formed one after another along the axial direction that respectively engage first and second engaging parts at one end of the cylindrical treatment tool to control radial movement of an opening end, and wherein the elongated shaft member is displaced relative to the cylindrical treatment tool in one axial direction to release a first engagement and displaced relative to the cylindrical treatment tool in a direction other than the one direction to release a second engagement independently of each other.
Cylindrical treatment tool with two engaging parts enabling axial-direction-dependent release
A cylindrical treatment tool comprising a main tubular part configured to radially expand and a first engaging part and a second engaging part protruding in a same direction away from one opening end of the main part along an axial direction by a predetermined protrusion length and configured to engage with the elongated shaft member, wherein the first engaging part is configured to allow release of a first engagement with the elongated shaft member by relative displacement of the cylindrical treatment tool and the elongated shaft member in one direction along the axial direction, and wherein the second engaging part is configured to allow release of a second engagement with the elongated shaft member by relative displacement of the cylindrical treatment tool and the elongated shaft member in a direction other than the one direction along the axial direction.
The claim coverage centers on two-stage, independently controlled engagement release achieved by an elongated shaft member having first and second controlling parts engaging first and second engaging parts of a radially expandable cylindrical treatment tool. The release of each engagement is triggered by relative displacement along different axial directions, thereby controlling radial movement at the opening end, and the tool is correspondingly configured with two axially protruding engaging parts that provide the different release conditions.
Stated Advantages
Reduction of invasiveness and complexity by using a smaller-diameter sheath design enabled by a single shaft arrangement instead of dual-shaft complexity.
Documented Applications
Indwelling a living body lumen, including a blood vessel aneurysm, using a radially expandable indwelling device and cylindrical treatment tool (e.g., a stent graft configuration as described in the partial content).
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