MEDICAL DEVICE DELIVERY

• US 20190314175A1
• Filed: 04/12/2018
• Published: 10/17/2019
• Est. Priority Date: 04/12/2018
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Dawson, Marc, Nageswaran, Ashok, Barrett, Aaron, Dang, Hieu
• Granted Patent: US 11,071,637 B2
• Time in Patent Office: Days
• CPC Class Codes: A61F 2/06 Blood vessels
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2/9517 handle assemblies therefor
• CPC Class Codes: A61F 2/966 with relative longitudinal movement between outer sleeve and prosthesis, e.g. using a push rod
• CPC Class Codes: A61F 2002/9505 having retaining means other than an outer sleeve, e.g. male-female connector between stent and instrument
• CPC Class Codes: A61F 2002/9511 the retaining means being filaments or wires
• CPC Class Codes: A61F 2002/9665 with additional retaining means

Abstract

A stent delivery system includes a core member and a coupling assembly rotatably coupled to the core member distal segment. The coupling assembly includes first and second plates and first and second spacers. The first plate is rotatably coupled to the core member and includes an outer surface having three or more projections separated by recesses. The first spacer is coupled to the core member and disposed between the first plate and a proximal restraint. The second plate is rotatably coupled to the core member and includes an outer surface having three or more projections separated by recesses. The second spacer is coupled to the core member and disposed between the first plate and the second plate. A stent extends along the core member distal segment such that an inner surface of the stent is engaged by one or more projections of the first plate or the second plate.

Claims

1. A stent delivery system comprising:

a core member configured for advancement within a corporeal lumen;

a coupling assembly positioned about the core member, the coupling assembly comprising;

a first plate rotatably positioned about the core member, the first plate including an outer surface having three or more projections separated by recesses;

a coil spacer positioned about the core member proximal of and adjacent to the first plate; and

a stent extending along the core member such that the stent is engaged by one or more projections of the first plate and is thereby distally advanceable via the core member.

2. The system of claim 1, wherein the coil spacer comprises a zero-pitch coil.

3. The system of claim 1, wherein the coil spacer is axially substantially incompressible.

4. The system of claim 1, wherein the coil spacer is rotatably positioned about the core member.

5. The system of claim 1, further comprising a proximal restraint coupled to the core member, and wherein the coil spacer comprises a flattened proximal end face configured to abut against the proximal restraint.

6. The system of claim 1, wherein the coil spacer comprises a flattened distal end face configured to abut against the first plate.

7. The system of claim 1, wherein an outer diameter of the coil spacer is less than or equal to a recess diameter of the first plate.

8. The system of claim 1, wherein the coil spacer comprises a wire having a square or rectangular cross section that is wound into a coil configuration.

9. The system of claim 1, wherein the coil spacer comprises a wire that is wound into a coil configuration and the wound wire forms a number of winds, each with flat distal and proximal faces, wherein the faces of adjacent winds contact each other to enable the coil spacer to bear longitudinally compressive loads without shortening.

10. The system of claim 1, wherein the coupling assembly further comprises a second plate rotatably positioned about the core member, the second plate including an outer surface having three or more projections separated by recesses, and wherein one or more of the projections of the second plate engages the stent such that the stent is distally advanceable via the core member.

11. The system of claim 10, further comprising a distal restraint disposed distal to the second plate, the distal restraint being longitudinally fixed with respect to the core member.

12. The system of claim 10, wherein the coupling assembly further comprises a second spacer positioned about the core member and disposed between the first plate and the second plate.

13. The system of claim 12, wherein the second spacer comprises a second coil spacer.

14. The system of claim 12, wherein the second spacer comprises a solid tubular member.

15. A medical device delivery system, comprising:

a core member;

a coupling assembly carried by the core member, the coupling assembly comprising;

a first device engagement member rotatably coupled to the core member, the first device engagement member including an outer surface having projections separated by recesses; and

a coil spacer coupled to the core member and disposed proximal of and adjacent to the first device engagement member.

16. The system of claim 15, wherein the coil spacer comprises a zero-pitch coil.

17. The system of claim 15, wherein the coil spacer comprises a flattened proximal end face configured to abut against a proximal restraint coupled to the core member.

18. The system of claim 15, wherein the coil spacer comprises a flattened distal end face configured to abut against the first device engagement member.

19. The system of claim 15, wherein an outer diameter of the coil spacer is less than or equal to a recess diameter of the first device engagement member.

20. The system of claim 15, wherein the first device engagement member comprises a rigid plate or sprocket.

21. The system of claim 15, wherein the coil spacer comprises a wire having a square or rectangular cross section that is wound into a coil configuration.

22. The system of claim 15, wherein the coil spacer comprises a wire that is wound into a coil configuration and the wound wire forms a number of winds, each with flat distal and proximal faces, wherein the faces of adjacent winds contact each other to enable the coil spacer to bear longitudinally compressive loads without shortening.

23. The system of claim 15, wherein the coupling assembly further comprises a second device engagement member rotatably positioned about the core member, the second device engagement member including an outer surface having three or more projections separated by recesses.

24. The system of claim 23, further comprising an expandable medical device extending along the core member such that the medical device is engaged by one or more projections of the first device engagement member and of the second device engagement member, and is thereby distally advanceable via the core member.

25. The system of claim 23, wherein the coupling assembly further comprises a second spacer positioned about the core member and disposed between the first device engagement member and the second device engagement member.