DELIVERY SYSTEM HAVING A SELF-EXPANDING BRAIDED STENT

• US 20080288043A1
• Filed: 11/01/2007
• Published: 11/20/2008
• Est. Priority Date: 05/04/2005
• Status: Active Grant

• Current Assignee: Jotec Gmbh (Cryolife Incorporated)
• Original Assignee: Jotec Gmbh (Cryolife Incorporated)
• Inventors: Hauser, Berthold, Kaufmann, Ralf
• Granted Patent: US 8,043,353 B2
• Time in Patent Office: Days
• US Class Current: 623/1.11
• 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 2/966 with relative longitudinal movement between outer sleeve and prosthesis, e.g. using a push rod

Abstract

An insertion system with a self-expanding braided stent (11) for implantation in a blood vessel has an outer sleeve (12) with a distal end (14) and a proximal end. An inner sleeve (16) arranged in the outer sleeve (12) is displaceable relative to the latter and protrudes, with a handling section, from the proximal end of the outer sleeve (12). Moreover, at the distal end (15), there is a tip (18) which is securely connected to a stent support (24) on which the braided stent (11) is arranged in its loaded state. The stent support (24) is arranged to be displaceable relative to the inner sleeve (16).

Claims

1. A delivery system with a self-expanding braided stent (11) intended for implantation into a blood vessel, having

an outer sleeve, which has a distal end (14) and a proximal end (15) and in which an inner sleeve (16) is arranged that is displaceable relative to the outer sleeve (12) and protrudes, with a handling portion (17), from the proximal end (15) of the outer sleeve (12), and with a tip (18), which is arranged at the distal end (14) and is securely connected to a stent support (24) on which the braided stent (11) is arranged in its loaded state,

wherein the stent support (24) is arranged to be displaceable relative to the inner sleeve (16).

2. The delivery system as claimed in claim 1, wherein between outer sleeve (12) and stent support (24), a locking mechanism is provided by which the movement of the stent support (24) relative to the outer sleeve (12) in the distal direction is limited to a maximum path of travel (43).

3. The delivery system as claimed in claim 1, wherein between outer sleeve (12) and stent support (24), a locking mechanism is provided by which the movement of the stent support (24) relative to the outer sleeve (12) in the distal direction is limited to a maximum path of travel (43) and wherein the locking mechanism limits the movement of the stent support (24) relative to the outer sleeve (12) in the proximal direction when the stent support (24) has previously been moved relative to the outer sleeve (12) in the distal direction by a predetermined path of travel (43′

).

4. The delivery system as claimed in claim 1, wherein between outer sleeve (12) and stent support (24), a locking mechanism is provided by which the movement of the stent support (24) relative to the outer sleeve (12) in the distal direction is limited to a maximum path of travel (43) and wherein the locking mechanism limits the movement of the stent support (24) relative to the outer sleeve (12) in the proximal direction when the stent support (24) has previously been moved relative to the outer sleeve (12) in the distal direction by a predetermined path of travel (43′

) and wherein an unlocking mechanism is connected to the inner sleeve (16) and, upon proximal movement of the inner sleeve (16) relative to the outer sleeve (12), again frees the movement of the stent support (24) relative to the outer sleeve (12).

5. The delivery system as claimed in claim 1, wherein between outer sleeve (12) and stent support (24), a locking mechanism is provided by which the movement of the stent support (24) relative to the outer sleeve (12) in the distal direction is limited to a maximum path of travel (43) and wherein the stent support (24) is connected at its proximal end (25) to a control rod (26), which extends centrally through the inner sleeve (16) and protrudes at the proximal end (15) from the inner sleeve (16).

6. The delivery system as claimed in claim 1, wherein between outer sleeve (12) and stent support (24), a locking mechanism is provided by which the movement of the stent support (24) relative to the outer sleeve (12) in the distal direction is limited to a maximum path of travel (43) and wherein the stent support (24) is at its proximal end (25) in the inner sleeve (16), which has a longitudinal slit (28) through which a first limit stop (39) connected to the outer sleeve (12) protrudes into the inner sleeve (16), by means of which limit stop (39) the movement of the stent support (24) relative to the outer sleeve (12) in the distal direction is limited to the maximum path of travel (43).

7. The delivery system as claimed in claim 1, wherein between outer sleeve (12) and stent support (24), a locking mechanism is provided by which the movement of the stent support (24) relative to the outer sleeve (12) in the distal direction is limited to a maximum path of travel (43) and wherein the stent support (24) is at its proximal end (25) in the inner sleeve (16), which has a longitudinal slit (28) through which a first limit stop (39) connected to the outer sleeve (12) protrudes into the inner sleeve (16), by means of which limit stop (39) the movement of the stent support (24) relative to the outer sleeve (12) in the distal direction is limited to the maximum path of travel (43), and wherein the stent support (24) is securely connected to a distal control block (35), which is mounted displaceably in the inner sleeve (16) and which is connected under tension to a proximal control block (36) mounted displaceably in the inner sleeve (16), which proximal control block (36) comes into contact with the first limit stop (39) upon movement of the stent support (24) relative to the outer sleeve (12) in the distal direction by the maximum path of travel (43).

8. The delivery system as claimed in claim 1, wherein between outer sleeve (12) and stent support (24), a locking mechanism is provided by which the movement of the stent support (24) relative to the outer sleeve (12) in the distal direction is limited to a maximum path of travel (43) and wherein the stent support (24) is at its proximal end (25) in the inner sleeve (16), which has a longitudinal slit (28) through which a first limit stop (39) connected to the outer sleeve (12) protrudes into the inner sleeve (16), by means of which limit stop (39) the movement of the stent support (24) relative to the outer sleeve (12) in the distal direction is limited to the maximum path of travel (43), and wherein the longitudinal slit (28) is assigned a further limit stop (57), which is connected to the stent support (24) and which comes into contact with a recess (58) on the outer sleeve (12) and limits the movement of the stent support (24) relative to the outer sleeve (12) in the proximal direction when the stent support (24) has previously been moved relative to the outer sleeve (12) by the predetermined path of travel (43′

) in the distal direction.

9. The delivery system as claimed in claim 1, wherein between outer sleeve (12) and stent support (24), a locking mechanism is provided by which the movement of the stent support (24) relative to the outer sleeve (12) in the distal direction is limited to a maximum path of travel (43) and wherein the stent support (24) is at its proximal end (25) in the inner sleeve (16), which has a longitudinal slit (28) through which a first limit stop (39) connected to the outer sleeve (12) protrudes into the inner sleeve (16), by means of which limit stop (39) the movement of the stent support (24) relative to the outer sleeve (12) in the distal direction is limited to the maximum path of travel (43), and wherein the stent support (24) is securely connected to a distal control block (35), which is mounted displaceably in the inner sleeve (16) and which is connected under tension to a proximal control block (36) mounted displaceably in the inner sleeve (16), which proximal control block (36) comes into contact with the first limit stop (39) upon movement of the stent support (24) relative to the outer sleeve (12) in the distal direction by the maximum path of travel (43), wherein the further limit stop (57) is arranged on the distal control block (35).

10. The delivery system as claimed in claim 1, wherein between outer sleeve (12) and stent support (24), a locking mechanism is provided by which the movement of the stent support (24) relative to the outer sleeve (12) in the distal direction is limited to a maximum path of travel (43) and wherein the stent support (24) is at its proximal end (25) in the inner sleeve (16), which has a longitudinal slit (28) through which a first limit stop (39) connected to the outer sleeve (12) protrudes into the inner sleeve (16), by means of which limit stop (39) the movement of the stent support (24) relative to the outer sleeve (12) in the distal direction is limited to the maximum path of travel (43), and wherein the stent support (24) is securely connected to a distal control block (35), which is mounted displaceably in the inner sleeve (16) and which is connected under tension to a proximal control block (36) mounted displaceably in the inner sleeve (16), which proximal control block (36) comes into contact with the first limit stop (39) upon movement of the stent support (24) relative to the outer sleeve (12) in the distal direction by the maximum path of travel (43), and wherein the distal and proximal control blocks (35, 36) are connected to each other by a connecting wire (42), which preferably extends through a guide hole (41) provided in the first limit stop (39).

11. The delivery system as claimed in claim 1, wherein between outer sleeve (12) and stent support (24), a locking mechanism is provided by which the movement of the stent support (24) relative to the outer sleeve (12) in the distal direction is limited to a maximum path of travel (43) and wherein the stent support (24) is at its proximal end (25) in the inner sleeve (16), which has a longitudinal slit (28) through which a first limit stop (39) connected to the outer sleeve (12) protrudes into the inner sleeve (16), by means of which limit stop (39) the movement of the stent support (24) relative to the outer sleeve (12) in the distal direction is limited to the maximum path of travel (43), and wherein the stent support (24) is securely connected to a distal control block (35), which is mounted displaceably in the inner sleeve (16) and which is connected under tension to a proximal control block (36) mounted displaceably in the inner sleeve (16), which proximal control block (36) comes into contact with the first limit stop (39) upon movement of the stent support (24) relative to the outer sleeve (12) in the distal direction by the maximum path of travel (43), and wherein the distal and proximal control blocks (35, 36) are formed at opposite ends of a control sleeve (55), which is mounted displaceably in the inner sleeve (16) and in which a longitudinal slit (46) is provided into which the first limit stop (39) engages.

12. The delivery system as claimed in claim 1, wherein between outer sleeve (12) and stent support (24), a locking mechanism is provided by which the movement of the stent support (24) relative to the outer sleeve (12) in the distal direction is limited to a maximum path of travel (43), and wherein a longitudinally displaceable slide body (46) is arranged on the stent support (24) and lies between the braided stent (11) and the tip (18) when the braided stent (11) is in the loaded state.

13. The delivery system as claimed in claim 1, wherein between outer sleeve (12) and stent support (24), a locking mechanism is provided by which the movement of the stent support (24) relative to the outer sleeve (12) in the distal direction is limited to a maximum path of travel (43), and wherein a longitudinally displaceable slide body (46) is arranged on the stent support (24) and lies between the braided stent (11) and the tip (18) when the braided stent (11) is in the loaded state, and wherein the slide body (46) has an external diameter (49) that is greater than the difference between the internal diameter (51) of the outer sleeve (12) at its distal end (14) and twice the wall thickness (52) of the braided stent (11).

14. The delivery system as claimed in claim 1, wherein between outer sleeve (12) and stent support (24), a locking mechanism is provided by which the movement of the stent support (24) relative to the outer sleeve (12) in the distal direction is limited to a maximum path of travel (43), and wherein a longitudinally displaceable slide body (46) is arranged on the stent support (24) and lies between the braided stent (11) and the tip (18) when the braided stent (11) is in the loaded state, and wherein the slide body (46) is rounded at its proximal end (47).

15. The delivery system as claimed in claim 1, wherein between outer sleeve (12) and stent support (24), a locking mechanism is provided by which the movement of the stent support (24) relative to the outer sleeve (12) in the distal direction is limited to a maximum path of travel (43), and wherein a longitudinally displaceable slide body (46) is arranged on the stent support (24) and lies between the braided stent (11) and the tip (18) when the braided stent (11) is in the loaded state, and wherein the slide body (46) is made of a material that has a low coefficient of kinetic friction relative to the inner wall (48) of the braided stent (11).

16. The delivery system as claimed in claim 1, wherein between outer sleeve (12) and stent support (24), a locking mechanism is provided by which the movement of the stent support (24) relative to the outer sleeve (12) in the distal direction is limited to a maximum path of travel (43), and wherein a longitudinally displaceable slide body (46) is arranged on the stent support (24) and lies between the braided stent (11) and the tip (18) when the braided stent (11) is in the loaded state, and wherein the slide body (46) is made of an elastic material.

17. The delivery system as claimed in claim 1, wherein between outer sleeve (12) and stent support (24), a locking mechanism is provided by which the movement of the stent support (24) relative to the outer sleeve (12) in the distal direction is limited to a maximum path of travel (43), and wherein a longitudinally displaceable slide body (46) is arranged on the stent support (24) and lies between the braided stent (11) and the tip (18) when the braided stent (11) is in the loaded state, and wherein the distal end (14) of the outer sleeve (12) is stiffened.

18. The delivery system as claimed in claim 1, wherein a spacer (23) is fixed on the handling portion (17) of the inner sleeve (16) and limits the sliding of the inner sleeve (16) into the outer sleeve (12).

19. The delivery system as claimed in claim 1, wherein the inner sleeve (16) has a holder at its distal end (32), via which holder the proximal end (33) of the braided stent (11) is connected under tension to the inner sleeve (16).

20. The delivery system as claimed in claim 1, wherein the inner sleeve (16) has a holder at its distal end (32), via which holder the proximal end (33) of the braided stent (11) is connected under tension to the inner sleeve (16), and wherein the holder has a flange (34) on which the proximal end (33) of the braided stent (11) is fixed by the outer sleeve (12).

21. The delivery system as claimed in claim 1, wherein a channel (27) for a guide wire (19) extends centrally through the tip (18) and the stent support (24), which guide wire (19) is guided laterally out of the inner sleeve (16) and outer sleeve (12) through longitudinal slits (29, 31).