Self-expanding stent delivery device

• US 20040181239A1
• Filed: 05/07/2004
• Published: 09/16/2004
• Est. Priority Date: 04/30/2001
• Status: Active Grant

• Current Assignee: Angiomed GmbH and Co Medizentechnik KG (Becton, Dickinson & Co)
• Original Assignee: Angiomed GmbH and Co Medizentechnik KG (Becton, Dickinson & Co)
• Inventors: Vogel, Michael, Dorn, Jurgen
• Granted Patent: US 7,550,001 B2
• Time in Patent Office: Days
• US Class Current: 606/108
• 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: A61M 39/1011 Locking means for securing connection; Additional tamper safeties A61M39/16 takes precedence

Abstract

The present invention relates to a method and device (1) for releasing into the body from a delivery system a medical prosthesis mounted on the delivery system and held by a constraint (16) in a constrained delivery disposition. The device comprises a first abutment (28) for the delivery system, a second abutment (18) for an elongate element (30) to connect the device to the prosthesis constraint, a track (14) for the second abutment (18) to advance along, from a starting point corresponding to constraint of the prosthesis, to a finishing point corresponding to separation of the prosthesis and constraint (16), ratchet means (38) to advance the second abutment (18) progressively, from the starting point to the finishing point, in a plurality of actuation strokes, and is characterised by a full stroke actuator (24), to advance the second abutment (18) all the way from an intermediate point on said track (14) to said finishing point in one single stroke of the said actuator (24), the intermediate point being selectable by the user within a portion of the track (14) which extends over at least half the length of the track.

Claims

1. A device (1) for releasing into the body from a delivery system a medical prosthesis mounted on the delivery system and held by a constraint (16) in a constrained delivery disposition, the device comprising:

a first abutment (28) for the delivery system;

a second abutment (18) for an elongate element (30) to connect the device to the prosthesis constraint;

a track (14) for the second abutment (18) to advance along, from a starting point corresponding to constraint of the prosthesis, to a finishing point corresponding to separation of the prosthesis and constraint (16);

ratchet means (38) to advance the second abutment (18) progressively, from the starting point to the finishing point, in a plurality of actuation strokes; and

characterised by;

a full stroke actuator (24), to advance the second abutment (18) all the way from an intermediate point on said track (14) to said finishing point in one single stroke of the said actuator (24), the intermediate point being selectable by the user within a portion of the track (14) which extends over at least half the length of the track.

2. Device as claimed in claim 1, wherein the ratchet means (38) comprises a trigger (34).

3. Device as claimed in claim 1 or claim 2, in which the ratchet means (38) includes a take-up reel (32).

4. Device as claimed in claim 3, wherein the take-up reel (32) is provided with a pawl (44) to resist reverse movement.

5. Device as claimed in any one of the preceding claims, wherein a biasing means (46) is provided for biasing the trigger (34) towards a rest position.

6. Device as claimed in any one of the preceding claims, wherein the biasing means (46) maintains contact of the ratchet means (38) with take-up reel (32).

7. Device as claimed in any one of the preceding claims, wherein the biasing means is a leaf spring (46).

8. Device as claimed in any one of the preceding claims, wherein the full stroke actuator is a slider (24).

9. Device as claimed in claim 8, wherein the device includes a housing (12) and the slider (24) protrudes from the housing (12) for manual manipulation.

10. Device as claimed in any one of the preceding claims, wherein the ratchet means (38) is connected to the second abutment (18) by a collapsible element (30).

11. Device as claimed in claim 10, wherein the collapsible element (30) is a line.

12. Device as claimed in any one of the preceding claims, wherein the track (14) is provided by a pair of parallel rails (22).

13. A method for releasing into the body from a delivery system a medical prosthesis mounted on the delivery system and held by a constraint in a constrained delivery system, the method comprising

a first release phase characterised by stepwise release of a first portion of the prosthesis, by successive actuation strokes of a ratchet means, followed by

a second phase of release of the prosthesis, characterised by a single stroke of a full stroke prosthesis release actuator.