CN109223268B

CN109223268B - Conveying device with branch supports

Info

Publication number: CN109223268B
Application number: CN201811217109.5A
Authority: CN
Inventors: 徐庶; 卞晓明; 郑成福; 杨延宗; 杜旭东
Original assignee: Dalian Corvivo Medical Co ltd
Current assignee: Dalian Corvivo Medical Co ltd
Priority date: 2018-10-18
Filing date: 2018-10-18
Publication date: 2021-02-12
Anticipated expiration: 2038-10-18
Also published as: CN109223268A

Abstract

The invention relates to a conveying device with a branch stent, and belongs to the technical field of medical instruments. The conveying device with the branch stent comprises a stent with branches, a distal main sheath, a proximal main sheath and branch sheaths with the same number as the branches; the distal main sheath tube is used for restraining the distal end of the stent main support in the distal main sheath tube; the branch sheath tube restrains branches of the stent in the branch sheath tube; the proximal main sheath tube constrains the proximal end of the stent main leg within the proximal main sheath tube. The stent conveying device with the branches can adopt the sheath to restrain and release the stent, and solves the problem that the stent with the branches is difficult to release. Compared with the prior art that the wire harness is adopted to bind the support, the surface of the sheath tube is smooth, the blood vessel is not easy to be damaged, the sheath tube is more safe to bind the support, and the support is not easy to fall off from the sheath tube in the support storage and transportation processes.

Description

Conveying device with branch supports

Technical Field

The invention relates to a conveying device with a branch stent, and belongs to the technical field of medical instruments.

Background

Currently, aortic dissections and aneurysms are among the most serious cardiovascular diseases. With the development and wide application of interventional technology, the application of the stent graft is increasingly wide, the traditional stent graft is in a straight cylinder shape, the stent graft is compressed in a straight cylinder-shaped sheath when not in work, the sheath is drawn away towards the near end (the end of an operator) after being implanted into a target blood vessel, and the stent graft expands and supports a lesion. However, the aortic dissection and the aneurysm cover a large area, and many branch vessels are distributed in the artery, and in some cases, if a straight cylindrical stent graft is used to block important branch vessels, the blood supply of organs may be insufficient, and even patients may die.

To solve this problem, single-branch stents have appeared in recent years. The single branch stent is formed by adding a lateral branch small stent on a straight cylindrical stent, and theoretically solves the problem that a branch blood vessel is blocked. In practice, however, delivery of such a single-branch stent to the diseased vessel is another challenge, how it is released. The method of proximally withdrawing the sheath to release the stent is not feasible with a single-limb stent because the limbs of the single-limb stent block the proximal withdrawal of the sheath.

At present, most of the clinically used single-branch stents are delivered by opening blood vessels by hands of operators in clinic, the operation is extremely complicated, and the failure chance is high. The chinese patent 201110085820.1 discloses a method for binding and releasing the stent body with a wire harness, but the situation in the artery is complicated, the wire harness is tightly supported between the stent and the blood vessel by the stent after releasing the stent, the action of withdrawing the wire harness is likely to damage the blood vessel, and the wire harness is likely to hook the strut of the stent, which results in the failure of the operation.

Disclosure of Invention

The present invention solves the above problems by controlling the release of the main branch and the branch, respectively.

The invention provides a conveying device with a branch stent, which comprises a branch stent and a sheath tube, wherein the branch stent is arranged on the branch stent; the sheath comprises a distal main branch sheath, a proximal main branch sheath and branch sheaths with the same number of branches; the distal main branch sheath tube restrains the distal end of the stent main branch in the distal main branch sheath tube, and when the distal main branch sheath tube is removed from the distal end of the stent main branch, the distal end of the stent main branch is unbounded and released; the branch sheath tube restrains branches of the stent in the branch sheath tube, and when the branch sheath tube is taken down from the branches of the stent, the branches of the stent are released and released; the proximal main sheath tube restrains the proximal end of the stent main leg in the proximal main sheath tube, and when the proximal main sheath tube is removed from the proximal end of the stent main leg, the proximal end of the stent main leg is unbound and released.

According to the invention, the material of the sheath tube is preferably at least one of polyether block amide, polyamide, polytetrafluoroethylene, polyether ether ketone and polyurethane.

The invention is preferably that the wall of the sheath tube is internally provided with a stainless steel wire, a titanium alloy wire or a polyether-ether-ketone wire.

The invention is preferably such that the distal end of the distal main sheath is pointed.

The invention preferably has the distal end of the branched sheath as a tip.

According to the invention, the sheath is preferably connected with a control element, and the sheath is taken down by pushing or pulling the control element.

According to the invention, the control piece is preferably made of stainless steel, titanium alloy, polyether ether ketone or a mixture of high polymers and metals.

The control element is preferably shaped as a tube or wire.

The invention is preferably that 1-5 control elements are connected to one sheath.

The invention has the beneficial effects that:

the stent conveying device with the branches can adopt the sheath to restrain and release the stent, and solves the problem that the stent with the branches is difficult to release. Compared with the prior art that the wire harness is adopted to bind the support, the surface of the sheath tube is smooth, the blood vessel is not easy to be damaged, the sheath tube is more safe to bind the support, and the support is not easy to fall off from the sheath tube in the support storage and transportation processes.

Drawings

In the figure 2 of the attached drawings of the invention,

FIG. 1 is a schematic view showing an unreleased stent with a branched stent delivery device according to example 1;

FIG. 2 is a schematic structural view of the stent delivery device with a branched stent delivery device according to example 1 after release;

11, the distal end of the main stent, 12, the branches of the stent, 13, the proximal end of the main stent, 21, the distal main sheath, 22, the branch sheath, 23, the proximal main sheath, 31, the distal main sheath control, 32, the branch sheath control, 33, and the proximal main sheath control.

Detailed Description

The following non-limiting examples are presented to enable those of ordinary skill in the art to more fully understand the present invention and are not intended to limit the invention in any way.

Example 1

A branched stent delivery device, which comprises a branched stent, a distal main sheath 21 with a tip at the distal end, a branched sheath 22 with a tip at the distal end, and a proximal main sheath 23;

the distal main sheath 21, the branch sheath 22 and the proximal main sheath 23 are made of polyurethane, and nitinol wires are arranged in the walls of the distal main sheath 21, the branch sheath 22 and the proximal main sheath 23;

the distal main sheath 21 binds the distal end 11 of the stent main support inside the distal main sheath 21, and 1 distal main sheath control 31 is connected to the distal end of the distal main sheath 21, when the distal main sheath control 31 is pushed, the distal main sheath 21 is removed from the distal end 11 of the stent main support, and the distal end 11 of the stent main support is unbound and released;

the branch sheath 22 binds the branch 12 of the stent in the branch sheath 22, and the distal end of the branch sheath 22 is connected with 1 branch sheath control 32, when the branch sheath control 32 is pushed, the branch sheath 22 is taken down from the branch 12 of the stent, and the branch 12 of the stent is unbound and released;

the proximal main sheath 23 binds the proximal end 13 of the stent main leg in the proximal main sheath 23, and 1 proximal main sheath control part 33 is connected to the proximal end of the proximal main sheath 23, when the proximal main sheath control part 33 is pulled, the proximal main sheath 23 is taken down from the proximal end 13 of the stent main leg, and the proximal end 13 of the stent main leg is unbound and released;

the distal main sheath control part 31, the branch sheath control part 32 and the proximal main sheath control part 33 are all nitinol tubes.

Example 2

The use method of the delivery device with the branch stent in the embodiment 1 comprises the following steps:

when the stent is not released, the delivery device with the branch stent is moved to a lesion position in a blood vessel through a guide wire;

the distal main sheath control part 31, the branch sheath control part 32 and the proximal main sheath control part 33 are manually operated to respectively remove the distal main sheath 21, the branch sheath 22 and the proximal main sheath 23, so that the stent is exposed in the blood vessel from the interior of the sheaths, and the stent naturally expands and supports the blood vessel in an unbound state;

after the stent is released, the distal main sheath 21 and the branch sheath 22 are respectively pulled through the proximal end 13 of the stent lumen and retracted by pulling back the distal main sheath control 31 and the branch sheath control 32.

Claims

1. The utility model provides a have branch support conveyor which characterized in that: the branch stent conveying device comprises a branch stent and a sheath tube; the sheath tube is made of at least one of polyether block amide, polyamide, polytetrafluoroethylene, polyether ether ketone and polyurethane;

the sheath tube is connected with a control piece, and the sheath tube is taken down by pushing or pulling the control piece;

the sheath comprises a distal main branch sheath, a proximal main branch sheath and branch sheaths with the same number of branches;

the distal main branch sheath tube restrains the distal end of the stent main branch in the distal main branch sheath tube, and when the distal main branch sheath tube is removed from the distal end of the stent main branch, the distal end of the stent main branch is unbounded and released;

the branch sheath tube restrains branches of the stent in the branch sheath tube, and when the branch sheath tube is taken down from the branches of the stent, the branches of the stent are released and released;

the proximal main sheath tube restrains the proximal end of the main stent leg in the proximal main sheath tube, and when the proximal main sheath tube is removed from the proximal end of the main stent leg, the proximal end of the main stent leg is unbound and released;

the control piece is made of stainless steel, titanium alloy and polyether ether ketone, or the control piece is made of a mixture of high polymers and metals;

the control part is in the shape of a tube or a wire;

a stainless steel wire, a titanium alloy wire or a polyether-ether-ketone wire is arranged in the tube wall of the sheath tube;

the conveying device does not adopt a wire harness binding bracket.

2. The branched stent delivery device according to claim 1, wherein: the distal end of the distal main sheath is a tip.

3. The branched stent delivery device according to claim 2, wherein: the distal end of the branch sheath is a tip.

4. The branched stent delivery device according to claim 3, wherein: 1-5 control elements are connected with one sheath tube.