Indwelling device for tubular medical treatment instrument and front tip of indwelling device for tubular medical treatment instrument
Inventors
Oka, Katsuhiko • Yokoi, Yoshihiko • Akita, Kazumi
Assignees
Interested in licensing this patent?
MTEC can help explore whether this patent might be available for licensing for your application.
Publication Number
US-8852259-B2
Publication Date
2014-10-07
Expiration Date
Abstract
A tubular medical treatment instrument indwelling device for indwelling a stent graft expandable in the radial direction, includes a tubular sheath, a rod member configured to move forward and backward inside the sheath along the axial direction of the sheath, and a front tip provided in the forward end portion of the rod member and includes, formed therein, an engaging portion being engageable with an engagement portion provided in the stent graft. The engaging portion is formed in a position where it is hided inside the sheath when the forward end portion of the sheath is sealed with the front tip. The tubular medical treatment instrument indwelling device is capable of inhibiting damaging of a blood vessel or freeing of parietal thrombus/parietal atheroma from occurring.
Core Innovation
The described invention is a tubular medical treatment instrument indwelling device for delivering a radially expandable tubular medical treatment instrument up to a diseased site and placing the same at the diseased site. The device includes a tubular sheath having flexibility and being constituted to encase the tubular medical treatment instrument therein, and a rod member that moves forward and backward inside the sheath along the axial direction. A front tip is provided at a forward end portion of the rod member and is capable of sealing a forward end portion of the sheath when the front tip is engaged with the tubular medical treatment instrument.
The front tip includes a hook-shaped engaging portion formed in a position where the hook-shaped engaging portion is hidden inside the sheath when the forward end portion of the sheath is sealed with the front tip. The front tip has a forward end side taper portion arranged on a forward end side of the front tip, a base end portion arranged on the base end side, and a body portion arranged between the forward end side taper portion and the base end portion. The body portion has an untapered, elongated shape, and an upper portion of the body portion has a substantially hemisphere-surfaced shape with a V-shaped-cut notched portion serving as the hook-shaped engaging portion, formed at a middle portion of the hemisphere-surfaced upper portion.
A plurality of elongated air purging groove portions are provided in an outer surface of the body portion separate from the notched portion, starting at the notched portion, extending through the body portion, and terminating at the forward end side taper portion. The elongated groove portions function as conduits for purging air when the sheath is being filled with saline solution. The described embodiments differ by groove placement, and variants include a single-piece tip and other engagement types, with applicability discussed beyond stent grafts.
Claims Coverage
The partial content provides two independent claims: one directed to the tubular medical treatment instrument indwelling device and one directed to a front tip for the tubular medical treatment instrument indwelling device. Across the independent claims, the coverage centers on a sealing front tip with a hook-shaped engaging portion that is hidden inside the sheath when sealed, together with a specific V-shaped-cut notched engaging geometry and elongated air-purging groove portions that act as air conduits during saline filling.
Flexible tubular sheath encasing a radially expandable medical treatment instrument with axially movable rod
A tubular sheath having flexibility and constituted to encase the tubular medical treatment instrument therein, and a rod member constituted to move forward and backward inside the sheath along an axial direction of the sheath.
Sealing front tip with hidden hook-shaped engaging portion
A front tip provided in a forward end portion of the rod member, including a hook-shaped engaging portion engageable with an engagement portion provided in the tubular medical treatment instrument, wherein the front tip is capable of sealing a forward end portion of the sheath in a state in which the front tip is engaged with the tubular medical treatment instrument, and wherein the hook-shaped engaging portion is formed in a position where the hook-shaped engaging portion is hidden inside the sheath when the forward end portion of the sheath is sealed with the front tip.
Front tip geometry with forward-side taper portion, base end portion, and body portion
The front tip has a forward end side taper portion arranged on a forward end side of the front tip and having an outer diameter that increases from the forward end side to a base end side of the front tip, a base end portion arranged on the base end side, and a body portion arranged between the forward end side taper portion and the base end portion.
V-shaped-cut notched engaging portion formed in a hemisphere-surfaced upper body portion
The body portion has an untapered, elongated shape, and an upper portion of the body portion is provided with a notched portion serving as the hook-shaped engaging portion, the upper portion having a substantially hemisphere-surfaced shape; the notched portion is formed at a middle portion of the hemisphere-surfaced upper portion in a shape of a V-shaped-cut extending obliquely into the body portion, and when the forward end portion of the sheath is sealed with the front tip, the V-shaped-cut notched portion is covered and hidden inside the sheath.
Elongated air purging groove portions as conduits for purging air during saline filling
A plurality of elongated air purging groove portions are provided in an outer surface of the body portion separate from the notched portion, starting at the notched portion, extending through the body portion and terminating at the forward end side taper portion, whereby the elongated groove portions are able to function as a conduit for purging air when the sheath is being filled with saline solution.
Overall, the independent claims cover an indwelling device in which a sealing front tip engages a hook-shaped engaging portion on a radially expandable tubular medical treatment instrument while keeping the hook-shaped engaging portion hidden inside the sheath, and they further specify the front tip structure via a V-shaped-cut notched geometry in a hemisphere-surfaced upper body and elongated air-purging groove portions that act as conduits for purging air during saline filling.
Stated Advantages
Reduced risk of blood vessel wall damage.
Inhibition of dislodging parietal thrombus.
Inhibition of dislodging parietal atheroma.
Documented Applications
Delivery of a radially expandable tubular medical treatment instrument up to a diseased site and placement of the same at the diseased site, including use with a stent graft (radially expandable tubular medical treatment instrument).
Use of a front tip for a tubular medical treatment instrument indwelling device to deliver and place the radially expandable tubular medical treatment instrument at a diseased site.
Interested in licensing this patent?