Easy-to-control interventional instrument delivery device

Patent metadata

Field	Value
Publication number	US-12588992-B2
Application number	US-202217876913-A
Country	US
Kind code	B2
Filing date	Jul 29, 2022
Priority date	Oct 24, 2017
Publication date	Mar 31, 2026
Grant date	Mar 31, 2026

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 slidable 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 . A method for delivering an implantable device to a delivery site by a delivery device, wherein the implantable device comprises at least one connecting portion, and the delivery device comprises:
a core tube, an outer sheath surrounding the core tube and movable relative to the core tube, a fixing head fixed on the core tube and having at least one positioning portion, and at least one bar having a movable distal end and a proximal end which is fixed with at least one of the core tube and the fixing head, and the delivery device having an initial state in which state the at least one bar is released from the outer sheath and the distal end of the at least one bar is further away from the core tube in a radial direction relative to the proximal end of the at least one bar, and a delivering state in which state the at least one bar is constrained by the outer sheath, and the implantable device having a loaded state in the delivery device and a completely released state from the delivery device, wherein, in the loaded state, the at least one bar maintains engagement between the at least one connecting portion of the implantable device and the at least one positioning portion of the fixing head under a constraint of the outer sheath, and in the completely released state, the implantable device is completely exposed out of the outer sheath, the method comprising: coupling the at least one connecting portion of the implantable device to the at least one positioning portion of the fixing head in the initial state and advancing the outer sheath to completely surround the implantable device, delivering the delivery device with the implantable device in the loaded state to the delivery site, and retracting the outer sheath until the at least one bar is released from the constraint of the outer sheath and thus moves radially and outwardly, thereby releasing the entire implantable device at the delivery site; wherein the positioning portion is configured as a positioning groove, the connecting portion is a connecting ear having a T-shape, and in the loaded state, the connecting ear is received in the respective positioning groove.

2 . The method according to claim 1 , wherein the loaded state includes an unreleased state in which state the implantable device is completely surrounded by the outer sheath and a partially released state in which state the implantable device is partially exposed out of the outer sheath, and the delivery device with the implantable device is delivered to the delivery site in the unreleased state.

3 . The method according to claim 2 , further comprising:
retracting the outer sheath until the implantable device is partially exposed out of the outer sheath, and when the implantable device needs to be repositioned, advancing the outer sheath to retrieve the exposed part of the implantable device into the outer sheath, thereby allowing the implantable device to be repositioned.

4 . The method according to claim 1 , wherein the core tube having a distal end, and the delivery device further comprising a guiding head which is fixed at the distal end of the core tube.

5 . The method according to claim 4 , wherein a distance is defined between the fixing head and the guiding head, and part of the implantable device in the loaded state is located between the guiding head and the fixing head.

6 . The method according to claim 1 , wherein the at least one bar comprises a plurality of bars arranged along a circumferential direction, the at least one positioning portion comprises a plurality of positioning portions arranged along the circumferential direction, and the plurality of bars correspond to the plurality of positioning portions respectively.

7 . The method according to claim 1 , wherein the positioning groove axially extends through the fixing head and is opened radially and outwardly.

8 . The method according to claim 1 , wherein the fixing head has a distal end, and the distal end of the bar extends distally no more than the distal end of the fixing head.

9 . The method according to claim 1 , wherein the fixing head has a distal end, and the distal end of the bar extends distally beyond the distal end of the fixing head.

10 . The method according to claim 1 , wherein each of the at least one bar is configured as a flat strip with a solid structure.

11 . The method according to claim 1 , wherein each of the at least one bar has a hollow structure.

12 . The method according to claim 1 , wherein each of the at least one bar is made of PTFE material.

13 . The method according to claim 1 , wherein each of the at least one bar has a length of 10 mm to 80 mm, a width of 1 mm to 2 mm, and a thickness of 0.2 mm to 0.5 mm.

14 . A method for delivering an implantable device to a delivery site by a delivery device, wherein the implantable device comprises at least one connecting portion, and the delivery device comprises:
a core tube, an outer sheath surrounding the core tube and movable relative to the core tube, a fixing head fixed on the core tube and having at least one positioning portion, and at least one bar having a movable distal end and a proximal end which is fixed with at least one of the core tube and the fixing head, and the delivery device having an initial state in which state the at least one bar is released from the outer sheath and the distal end of the at least one bar is further away from the core tube in a radial direction relative to the proximal end of the at least one bar, and a delivering state in which state the at least one bar is constrained by the outer sheath, and the implantable device having a loaded state in the delivery device and a completely released state from the delivery device, wherein, in the loaded state, the at least one bar maintains engagement between the at least one connecting portion of the implantable device and the at least one positioning portion of the fixing head under a constraint of the outer sheath, and in the completely released state, the implantable device is completely exposed out of the outer sheath, the method comprising: coupling the at least one connecting portion of the implantable device to the at least one positioning portion of the fixing head in the initial state and advancing the outer sheath to completely surround the implantable device, delivering the delivery device with the implantable device in the loaded state to the delivery site, and retracting the outer sheath until the at least one bar is released from the constraint of the outer sheath and thus moves radially and outwardly, thereby releasing the entire implantable device at the delivery site; wherein the positioning portion is configured as a positioning protrusion, the connecting portion is a connecting ear having a U-shape or an annular shape, and in the loaded state, the connecting ear surrounds the respective positioning protrusion.

Assignees

• Venus Medtech Hangzhou Inc

Inventors

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

Classifications

• A61F2/243 Primary

  Deployment by mechanical expansion · CPC title

• 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