Atraumatic anchoring and disengagement mechanism for permanent implant device

• US 6,447,530 B1
• Filed: 11/25/1997
• Issued: 09/10/2002
• Est. Priority Date: 11/27/1996
• Status: Expired due to Fees

• Current Assignee: Lifescreen Sciences LLC (Acacia Research Corporation)
• Original Assignee: Scimed Life Systems Incorporated (Boston Scientific Corporation)
• Inventors: Shank, Peter, Wallace, Michael J., DiMatteo, Kristian, Ostrovsky, Isaac, Kim, Hannah
• Primary Examiner(s): TRUONG, KEVIN THAO
• Application Number:
  US08/978,403
• Time in Patent Office: 1,750 Days
• Field of Search: 606/200, 606/198, 606/108
• US Class Current: 606/200
• CPC Class Codes: A61F 2/0103 With centering means
• CPC Class Codes: A61F 2/0105 Open ended, i.e. legs gathered only at one side
• CPC Class Codes: A61F 2/011 Instruments for their placement or removal
• CPC Class Codes: A61F 2002/016 made from wire-like elements
• CPC Class Codes: A61F 2002/8486 provided on at least one of the ends
• CPC Class Codes: A61F 2230/005 Rosette-shaped, e.g. star-shaped
• CPC Class Codes: A61F 2230/0067 conical

Abstract

A recoverable thrombosis filter that can be implanted and securely positioned within a vein at a desired location, and can be recovered through an endovenous route even after formation of neointima hyperplasia, is disclosed.

Claims

1. An improved recoverable filter comprising:

a. a plurality of thrombosis filtering means when deployed in a first direction for retaining thrombosis material moving in a second direction;

b. a plurality of positioning means coupled to said plurality of thrombosis filtering means, said plurality of positioning means having an associated plurality of wall engaging means deployed in said second direction for engaging an associated inner lumen wall and for restricting movement in said second direction; and

c. retracting means for retracting said plurality of positioning means and said plurality of thrombosis filtering means in response to externally percutaneously applied controls for allowing removal in said second direction;

wherein said retracting means includes holding means for holding said plurality of positioning means steady in a longitudinal direction; and

collapsing means for forcing said plurality of positioning means toward the first direction.

2. A filter as in claim 1, wherein said retracting means further includes:

enclosing means for enclosing said plurality of positioning means and said plurality of thrombosis filtering means for removal in said second direction.

3. An improved recoverable thrombosis filter comprising:

a. a filtering portion having a plurality of shaped filter elements, each of said plurality of shaped filter elements having a joining end and an inner vein wall engaging end;

b. a positioning portion having a plurality of shaped flexible anchor members, each of said plurality of shaped flexible anchor members having a mounting end and a holding end to engage an inner vein wall to impede motion in a first direction;

c. a joining member intermediate said filtering portion and said positioning portion, said joining member having a first end coupled to said joining end of each of said plurality of shaped filter elements and having a coupling portion;

d. a mounting member retained by said coupling portion, said mounting member coupled to said mounting end of each of said plurality of shaped flexible anchor members; and

e. a fastening device coupled to said mounting member, whereby said plurality of shaped flexible anchor members are collapsed from holding contact with the inner vein wall when pressure is applied to said fastening device to thereby allow encapsulation of the thrombosis filter for removal.

4. A filter as in claim 3, wherein said coupling portion includes a longitudinal cavity having a leading end and a trailing end, and said mounting member is fixedly positioned within said longitudinal cavity adjacent to said first end of said joining member, thereby closing said trailing end of said longitudinal cavity;

and a closure member affixed to said leading end of said longitudinal cavity.

5. A filter as in claim 4, wherein said mounting end of each of said plurality of shaped flexible anchor members pass through said closure member, and wherein said fastening device includes a mandrel passing through said closure member, said mandrel having a first end affixed to said mounting member, and having a second end;

and a hooking device coupled to said second end of said mandrel.

6. An improved recoverable filter comprising:

a. thrombosis filtering means to be deployed in a first direction for filtering and retaining thrombosis materials moving in a second direction;

b. holding means for holding an associated inner lumen wall and for restricting movement in said second direction;

said holding means includes a plurality of positioning means, each having first end means coupled to said plurality of shaped thrombosis filter means and deployed about a longitudinal axis and extending generally in said second direction, and having a second end; and

a plurality of engaging means, each of said plurality of engaging means, coupled to said second end of an associated one of said plurality of positioning means, and arranged for engaging an associated inner lumen wall for restricting movement in said second direction;

c. joining means for joining said thrombosis filtering means to said holding means; and

d. retracting means for retracting said holding means and said thrombosis filtering means in response to externally applied pressure for allowing removal in said second direction wherein said retracting means includes collapsing means for collapsing said plurality of positioning means in said first direction.

7. A filter as in claim 6, wherein said thrombosis filtering means are arranged around said longitudinal axis and includes a plurality of shaped thrombosis filter means deployed outwardly about said longitudinal axis and extending generally in a first direction and arranged for retaining thrombosis materials traveling in a second direction.

8. A filter as in claim 6, wherein said retracting means includes:

deflection means for deflecting said plurality of positioning means in said first direction.