SYSTEM TO ASSIST IN THE RELEASE OF A COLLAPSIBLE STENT FROM A DELIVERY DEVICE

• US 20140005767A1
• Filed: 03/08/2013
• Published: 01/02/2014
• Est. Priority Date: 06/29/2012
• Status: Active Grant

• Current Assignee: St. Jude Medical Cardiology Division Incorporated (Abbott Laboratories Incorporated)
• Original Assignee: St. Jude Medical Cardiology Division Incorporated (Abbott Laboratories Incorporated)
• Inventors: Glazier, Valerie J., Thomas, Ralph Joseph, Le, Khoi
• Granted Patent: US 9,918,837 B2
• Time in Patent Office: Days
• US Class Current: 623/2.11
• CPC Class Codes: A61F 2/2418 Scaffolds therefor, e.g. support stents
• CPC Class Codes: A61F 2/243 Deployment by mechanical expansion
• CPC Class Codes: A61F 2/2433 using balloon catheter
• CPC Class Codes: A61F 2/2436 Deployment by retracting a sheath
• CPC Class Codes: A61F 2230/0013 Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped
• CPC Class Codes: A61F 2230/008 paraboloidal

Abstract

A delivery device for an implantable medical device having a retention member at an end thereof may include a shaft extending in a longitudinal direction and defining a longitudinal axis, an elongated sheath surrounding a longitudinal portion of the shaft, a compartment defined inside the sheath and adapted to receive the medical device in an assembled condition, a retainer positioned at one end of the compartment, and an energy storage element positioned on the longitudinal portion of the shaft and configured to be radially compressed by the medical device when the elongated sheath covers the compartment containing the medical device. The sheath may be slidable relative to the shaft in the longitudinal direction. The retainer may include a recess adapted to receive the retention member of the medical device in the assembled condition.

Claims

1. A delivery device for an implantable medical device having a retention member at an end thereof, the delivery device comprising:

a shaft extending in a longitudinal direction and defining a longitudinal axis;

an elongated sheath surrounding a longitudinal portion of the shaft, the sheath being slidable relative to the shaft in the longitudinal direction;

a compartment defined inside the sheath and adapted to receive the medical device in an assembled condition;

a retainer positioned at one end of the compartment, the retainer including a recess adapted to receive the retention member of the medical device in the assembled condition; and

an energy storage element positioned on the longitudinal portion of the shaft and configured to be radially compressed by the medical device when the elongated sheath covers the compartment containing the medical device.

2. The delivery device of claim 1, wherein the energy storage element is at least partially aligned with the recess in a circumferential direction about the longitudinal axis.

3. The delivery device of claim 1, wherein the energy storage element is an elastomeric element surrounding at least a part of the longitudinal portion of the shaft.

4. The delivery device of claim 3, wherein a surface of the elastomeric element has a plurality of raised portions and a plurality of lowered portions distributed in a circumferential direction about the longitudinal axis.

5. The delivery device of claim 4, wherein the implantable medical device has a plurality of retention members at the end thereof and the retainer includes a plurality of recesses each adapted to receive a corresponding one of the retention members, and wherein each of the raised portions of the elastomeric element is at least partially aligned with a corresponding one of the recesses in the circumferential direction.

6. The delivery device of claim 4, wherein each of the lowered portions of the elastomeric element is disposed between two adjacent ones of the raised portions in the circumferential direction.

7. The delivery device of claim 3, wherein the elastomeric element is formed from a material selected from the group consisting of silicone, urethane, nylon, pebax, santoprene, butyl, neoprene, and combinations thereof.

8. The delivery device of claim 3, wherein the elastomeric element extends along the shaft in the longitudinal direction throughout the entire length of the compartment.

9. The delivery device of claim 1, wherein the energy storage element includes a leaf spring attached to the shaft.

10. The delivery device of claim 9, wherein the leaf spring extends in a circumferential direction about the longitudinal axis around at least a part of the longitudinal portion of the shaft.

11. The delivery device of claim 9, wherein the energy storage element includes a plurality of leaf springs distributed about the shaft in a circumferential direction about the longitudinal axis, each of the leaf springs extending in the longitudinal direction along at least a part of the longitudinal portion of the shaft.

12. The delivery device of claim 1, wherein the energy storage element is a recess insert, the recess insert overlying a bottom surface of the recess.

13. The delivery device of claim 10, wherein the recess insert is a pad of elastomeric material.

14. The delivery device of claim 10, wherein the recess insert is a spring.

15. A method of prosthetic valve delivery, comprising:

providing an expandable prosthetic valve having a retention member at an end thereof;

loading the valve into a compartment of a delivery device, the delivery device including a shaft, an elongated sheath surrounding a longitudinal portion of the shaft and slidable in longitudinal directions relative to the shaft, an energy storage element positioned on the longitudinal portion of the shaft, a retainer positioned at one end of the compartment, and a recess in the retainer, the valve being loaded into the compartment with the retention member positioned in the recess and with the valve overlying at least a portion of the energy storage element;

sliding the sheath in a first one of the longitudinal directions over the valve to radially compress the energy storage element and to hold the energy storage element in a compressed condition;

inserting the delivery device in a patient to position the valve at a target location; and

sliding the sheath in a second one of the longitudinal directions to uncover the valve, wherein the energy storage element is released from the compressed condition and radially expands to impart an outward radial force to the valve.

16. The method of claim 15, wherein the energy storage element is an elastomeric element surrounding at least a part of the longitudinal portion of the shaft.

17. The method of claim 15, wherein the energy storage element includes a leaf spring attached to the shaft.

18. The method of claim 15, wherein the energy storage element is a recess insert, the recess insert overlying a bottom surface of the recess.

19. A delivery device for an implantable medical device having a retention member at an end thereof, the delivery device comprising:

a shaft extending in a longitudinal direction and defining a longitudinal axis;

an elongated sheath surrounding a longitudinal portion of the shaft, the sheath being slidable relative to the shaft in the longitudinal direction;

a compartment defined inside the sheath and adapted to receive the medical device in an assembled condition;

a retainer positioned at one end of the compartment, the retainer including a recess adapted to receive the retention member of the medical device in the assembled condition, the recess having a bottom surface located a first distance from the longitudinal axis; and

a balloon extending along at least part of the longitudinal portion of the shaft, the balloon having a deflated state in which an outer surface of the balloon is located a second distance from the longitudinal axis, the second distance being less than the first distance, and the balloon having an inflated state in which the outer surface of the balloon is located a third distance from the longitudinal axis, the third distance being greater than the first distance.

20. A delivery device for an implantable medical device having a retention member at an end thereof, the retention member having an angled lateral edge, the delivery device comprising:

a shaft extending in a longitudinal direction and defining a longitudinal axis;

an elongated sheath surrounding a longitudinal portion of the shaft, the sheath being slidable relative to the shaft in the longitudinal direction;

a compartment defined inside the sheath and adapted to receive the medical device in an assembled condition; and

a retainer positioned at one end of the compartment, the retainer including a recess adapted to receive the retention member of the medical device in the assembled condition, the retainer having a retention edge facing the compartment and the recess having a first region sized to receive the retention member, the recess including a protuberance defining both a narrowed neck between the first region and the retention edge and an angled sidewall of the first region,

wherein in the assembled condition, an angle formed between the angled sidewall and the longitudinal axis is greater than an angle formed between the angled lateral edge and the longitudinal axis.