Easy-to-control interventional instrument delivery device

Patent metadata

Field	Value
Publication number	US-11406499-B2
Application number	US-202016856440-A
Country	US
Kind code	B2
Filing date	Apr 23, 2020
Priority date	Oct 24, 2017
Publication date	Aug 9, 2022
Grant date	Aug 9, 2022

Abstract

An easy-to-control interventional instrument delivery device, comprising a core tube (7), a guiding head (2) and a fixing head (3) being fixed onto the core tube (7); the guiding head (2) is fixed at a distal end of the core tube (7), and the fixing head (3) extends from a proximal end side of the core tube (7), an interventional instrument mounting position being located between the guiding head (2) and the fixing head (3); the outer periphery of the interventional instrument mounting position is provided with an axially skiable outer sheathing tube (5), further being provided with a floating limiting strip (1); a proximal end of the floating limiting strip (1) is a starting end (13) that is connected near the fixed head (3), and a distal end is a terminal end (11, 101) that floats between the interventional instrument mounting position and the outer sheathing tube (5). The easy-to-control interventional instrument delivery device is capable of fastening an end portion of a valve stent (8) during stent release so as to prevent the stent (8) from completely falling out during release, and reduces the relative friction between the delivery device and the valve during stent release and recovery.

First claim

What is claimed is:

1. An assembly, comprising:
an implantable instrument having a main body which has an outer periphery and at least one connecting ear which is connected with the main body; and
a delivery device separate from the implantable instrument and facilitating control of the implantable instrument, comprising:
a core tube having a distal end and a proximal end,
a guiding head which is fixed at the distal end of the core tube,
a fixing head which is fixed on the core tube and is provided with at least one positioning portion on an outer wall thereof for engaging with the at least one connecting ear of the implantable instrument, and the positioning portion is configured as a positioning groove axially extending through the fixing head, wherein the proximal end of the core tube extends through and out of the fixing head, and wherein at least a part of the main body of the implantable instrument is positioned between the guiding head and the fixing head,
an outer sheath which is configured for surrounding the outer periphery of the main body of the implantable instrument and is slidable in an axial direction, and
at least one movable limiting bar having a proximal end being a starting end which is fixed with at least one of the core tube and the fixing head, and a distal end being a terminal end which is configured between the implantable instrument and the outer sheath and is movable, wherein,

the at least one movable limiting bar is configured to maintain the engagement between the at least one connecting ear and the at least one positioning portion under the constraint of the outer sheath when the implantable instrument is in a loaded configuration.

2. The assembly of claim 1 , wherein when the implantable instrument assumes the loaded configuration, the connecting ear is configured to be inserted in a respective positioning groove, and the movable limiting bar is configured to overlap and abut against an outer side of a respective connecting ear to maintain the engagement between the connecting ear and the positioning portion.

3. The assembly of claim 2 , wherein the number of the at least one movable limiting bar is the same as that of the at least one positioning groove, and the at least one movable limiting bar corresponds to the at least one positioning groove respectively in a circumferential direction.

4. The assembly of claim 1 , wherein the most distal end of the movable limiting bar is aligned with the most distal end of the fixing head, or extends no more than the most distal end of the fixing head, or extends slightly beyond the most distal end of the fixing head.

5. The assembly of claim 2 , wherein a portion of the movable limiting bar for engaging with the positioning groove is configured to be partially or completely received in the positioning groove.

6. The assembly of claim 5 , wherein an area of the positioning groove that axially extends through the fixing head is configured to be closed by the movable limiting bar.

7. The assembly of claim 2 , wherein a portion of the movable limiting bar that is configured to be received in the positioning groove contacts with or abuts radially and inwardly against the connecting ear.

8. The assembly of claim 5 , wherein the movable limiting bar is configured to be aligned with or protrude from the outer wall of the fixing head in a radial direction.

9. The assembly of claim 1 , wherein the at least one movable limiting bar comprises two, three, or four movable limiting bars that are evenly arranged in a circumferential direction.

10. The assembly of claim 1 , wherein the movable limiting bar has a hollow or a solid structure.

11. The assembly of claim 10 , wherein the movable limiting bar is configured as a flat strip with a solid structure.

12. The assembly of claim 1 , wherein at least one of a portion of the movable limiting bar for engaging with the sheath and a portion of the movable limiting bar for engaging with the implantable instrument has a smooth surface and/or a lubricious coating.

13. The assembly of claim 1 , wherein the movable limiting bar is made of PTFE material.

14. The assembly of claim 1 , wherein the loaded configuration of the implantable instrument comprises an unreleased configuration, in which the implantable instrument is completely surrounded by the outer sheath, and a partial released configuration, in which the implantable instrument is partially exposed;
when the implantable instrument is in the loaded configuration, the at least one movable limiting bar is configured to maintain the engagement between the at least one connecting ear of the implantable instrument and the at least one positioning portion under the constraint of the outer sheath so as to prevent the at least one connecting ear from falling off the fixing head; and
when the implantable instrument is in a released configuration in which the implantable instrument is completely exposed out of the outer sheath, the force applied by the at least one movable limiting bar to maintain the engagement between the at least one connecting ear and the at least one positioning portion is released so as to allow the at least one connecting ear of the implantable instrument to fall off the at least one positioning portion.

15. The assembly of claim 14 , wherein when the implantable instrument is in the loaded configuration, a radial outer side of the movable limiting bar abuts against an inner wall of the sheath, a radial inner side of the movable limiting bar abuts against the connecting ear, and a portion of the at least one movable limiting bar that contacts with the at least one connecting ear of the implantable instrument is located at a radial outer side of the implantable instrument.

16. The assembly of claim 1 , wherein the movable limiting bar is configured as
a single strip, or
a branched structure, wherein branches of the branched structure extend towards the distal end to overlap and abut against an outer side of the connecting ear, and a connection of the branched structure connecting the branches is fixed at an outer side of the fixing head.

Assignees

• Venus Medtech Hangzhou Inc

Inventors

• Zhang Zhifei
• Zi Zhenjun
• Zeng Min Frank
• Gong Quangang

Classifications

• A61F2/2418

  Scaffolds therefor, e.g. support stents · CPC title

• A61F2/966

  with relative longitudinal movement between outer sleeve and prosthesis, e.g. using a push rod · CPC title

• A61F2/2436 Primary

  Deployment by retracting a sheath · CPC title

• A61F2/243 Primary

  Deployment by mechanical expansion · CPC title