Minimally Invasive Mitral Valve Replacement with Brim

• US 20170281341A1
• Filed: 06/15/2017
• Published: 10/05/2017
• Est. Priority Date: 12/19/2014
• Status: Active Grant

• Current Assignee: Venus Medtech (Hangzhou), Inc.
• Original Assignee: Venus Medtech (Hangzhou), Inc.
• Inventors: Lim, Hou-Sen, Gotz, Wolfgang
• Granted Patent: US 10,463,483 B2
• Time in Patent Office: Days
• CPC Class Codes: A61F 2/2418 Scaffolds therefor, e.g. support stents
• CPC Class Codes: A61F 2/2439 Expansion controlled by filaments
• CPC Class Codes: A61F 2210/0014 using shape memory or superelastic materials, e.g. nitinol
• CPC Class Codes: A61F 2220/0008 Fixation appliances for connecting prostheses to the body
• CPC Class Codes: A61F 2250/0006 for adjusting angular orientation
• CPC Class Codes: A61F 2250/006 modular

Abstract

A collapsible-expandable tubular stent (29) constructed of shape-memory material which is implantable into a human heart, which comprises proximal and distal rings (71, 73) and at least two spaced apart posts (69) that extend axially between said rings (71, 73), said distal ring (73) comprising a plurality of distal arms (77) which are connected to the distal ring (73) at only one end and which have a free opposite end; said proximal ring (71) comprising a plurality of, which are connected at only one end to the proximal ring (71) and which have a free opposite end, which proximal arms (75) are constructed to swing radially outward at their free ends.

Claims

1. A collapsible-expandable tubular stent (29) constructed of shape-memory material which is implantable into a human heart, which comprises:

proximal and distal rings (71, 73) and at least two spaced apart posts (69) that extend axially between said rings (71, 73);

said distal ring (73) comprising a plurality of distal arms (77) which are connected to the distal ring (73) at only one end of the arm and which have a free opposite end;

said proximal ring (71) comprising a plurality of proximal arms (75), which are connected at only one end of the arm to the proximal ring (71) and which have a free opposite end, which proximal arms (75) are constructed to swing radially outward at their free ends or to move radially outward, in particular when first put in parallel with a longitudinal axis of the tubular stent (29) by means of an radially inwardly acting force with the force then being released, or to exert from the longitudinal axis of the tubular stent (29) by an angle of preferably about 70°

or between 60° and

105°

, more preferably between 60° and

85°

.

2. A collapsible-expandable tubular stent (29) according to claim 1, wherein the distal arms (77) are connected to the distal end or distal tips of the distal ring (73), preferably exclusively.

3. A collapsible-expandable tubular stent (29) according to claim 1, wherein the proximal arms (75) are connected to the proximal end or proximal tips of the proximal ring (71), preferably exclusively.

4. A collapsible-expandable tubular stent (29) according to claim 1, wherein at least some of said distal arms (77) and/or some of the proximal arms (75) have means (79) at its said free opposite end which allows attachment of strings (49a, 49c) to individually control and retract some or each of said arms (75, 77).

5. A collapsible-expandable tubular stent (29) according to claim 1, wherein at least some of said proximal arms (75) are intended to assume a more or less rectangular position with regard to a longitudinal axis (L) of the tubular stent (29).

6. A collapsible-expandable tubular stent (29) according to claim 1, wherein at least some of said proximal arms (75) are interconnected to a brim (91) of biocompatible material, preferably of biocompatible sheet material.

7. A collapsible-expandable tubular stent (29) according to claim 1, which is integrally formed.

8. A collapsible-expandable tubular stent (29) according to claim 1, wherein the distal arms (77) are attached to the distal ring (73) or part of the latter such that a gap (dl) is provided between a proximal section or circumference or envelope of an undulating pattern of the distal ring (73) or section thereof and the distal arm (77).

9. A collapsible-expandable tubular stent (29) according to claim 8, wherein the tubular stent (29) is produced such that the gap (d1) does not widen or become narrower upon deploying the tubular stent (29) from a crimped state, or such that the gap (d1) keeps its width upon deploying,

10. A collapsible-expandable tubular stent (29) according to claim 1, wherein the distal ring (73) is arranged so as assume a smaller diameter at its distal end than a its proximal end if the free ends of the distal arms (77) are being forced to further extend radially away from the longitudinal axis (L) or from a longitudinal centre line of the tubular stent (29).

11. A heart valve comprising a the tubular stent (29) according to claim 1, the tubular stent (29) being interconnected to a plurality of flexible leaflets disposed interior of said stent (29), which leaflets open to permit blood flow in a downstream direction and close to prevent blood flow in an upstream direction therethrough.

12. A heart valve according to claim 11, wherein the leaflets are arranged so as to form a first cusp, a second cusp and a third cusp.

13. A heart valve according to claims 11, the stent (29) being connected with an exterior covering of biocompatible sheet material surrounding the posts (69).

14. A heart valve according to claim 11, being a mitral heart valve.

15. A delivery system for delivering a heart valve to a patient'"'"'s heart, the system comprising a heart valve according to claim 11.