Method for production of an expandable stent

• US 6,344,055 B1
• Filed: 09/27/2000
• Issued: 02/05/2002
• Est. Priority Date: 05/14/1997
• Status: Expired due to Fees

• Current Assignee: NOVO RPS ULC
• Original Assignee: NOVO RPS ULC
• Inventors: Shukov, George A.
• Primary Examiner(s): Thaler, Michael H.
• Application Number:
  US09/423,813
• Time in Patent Office: 496 Days
• Field of Search: 623/1.15, 623/901, 623/1.17, 606/1, 298/966
• US Class Current: 623/1.15
• CPC Class Codes: A61F 2/91 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
• CPC Class Codes: A61F 2/915 with bands having a meander structure, adjacent bands being connected to each other
• CPC Class Codes: A61F 2002/91525 within the whole structure different bands showing different meander characteristics, e.g. frequency or amplitude
• CPC Class Codes: A61F 2002/91533 characterised by the phase between adjacent bands
• CPC Class Codes: A61F 2002/91575 connected peak to trough
• CPC Class Codes: A61F 2240/001 Designing or manufacturing processes
• CPC Class Codes: Y10S 623/901 Method of manufacturing prosthetic device
• CPC Class Codes: Y10T 29/496 Multiperforated metal article making

Abstract

A method for producing an expandable stent includes steps of: (i) selectively removing portions of a solid tubular wall having a diameter substantially the same as that of the stent in a second, expanded position to define multiple sections of the porous surface connected to one another by a series of axially disposed connecting members; (ii) radially compressing the stent by applying a radially inward force on the multiple sections and the connecting members such that the multiple sections have a diameter substantially the same as that of the stent in the first, compressed position; and (iii) removing the connecting members between the multiple sections to produce the stent in the first position.

Claims

1. A process for producing a stent comprising a proximal end and a distal end in communication with one another, a tubular wall disposed between the proximal end and the distal end, the tubular wall having a longitudinal axis and a porous surface defined by a plurality of interconnecting struts, a series of the struts connected to one another at an interconnection point, the struts being reversibly hingable and plastically bendable at the interconnection point between a first, unrestrained contracted position and a second, expanded position, the process comprising the steps of:

(i) selectively removing portions of a solid tubular wall having a diameter substantially the same as that of the stent in the second position to define multiple sections of the porous surface connected to one another by a series of axially disposed connecting members;

(ii) radially compressing the stent in the second position to plastically bend the struts at the interconnection point thereby producing the stent in the first position, said radially compressing step comprising the step of applying a radially inward force on the multiple sections and the connecting members such that the multiple sections have a diameter substantially the same as that of the stent in the first position; and

(iii) removing the connecting members between the multiple sections to produce the stent in the first position.

2. The process defined in claim 1, wherein the stent is passed though a radially tapered die.

3. The process defined in claims 1, wherein the porous surface is produced by selectively removing portions of a solid tubular wall having a diameter substantially the same as that of the stent in the second position.

4. The process defined in claim 1, wherein the porous surface is produced by laser cutting portions of the solid tubular wall.

5. The process defined in claim 1, wherein prior to Step (iii), the tubular wall is subjected to an electro-polishing step.

6. The process defined in claim 1, wherein prior to Step (iii), the tubular wall is subjected to a metal deposition step.

7. The process defined in claim 6, wherein the metal deposition step comprises depositing gold on to selected portions of the tubular wall.

8. The process defined in claim 1, wherein Step (i) comprises laser cutting sections of the solid tubular wall.

9. The process defined in claim 1, wherein Step (ii) comprises passing the tubular wall through a radially tapered die.

10. The process defined in claim 1, wherein Step (i) further comprises defining tabs at one end of the tubular wall.

11. The process defined in claim 10, wherein the tubular wall is pulled by the tabs through a radially tapered die.

12. The process defined in claim 1, wherein prior to Step (iii), the tubular wall is subjected to an electro-polishing step.

13. The process defined in claim 1, wherein prior to Step (iii), the tubular wall is subjected to a metal deposition step.

14. The process defined in claim 13, wherein the metal deposition step comprises depositing gold on to selected portions of the tubular wall.