Elastic introducer sheath

• US 9,192,751 B2
• Filed: 03/08/2013
• Issued: 11/24/2015
• Est. Priority Date: 10/26/2012
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Macaulay, Patrick, Peter, Stephen
• Primary Examiner(s): TANNER, JOCELIN C
• Application Number:
  US13/791,110
• Publication Number:
  US 20140121629A1
• Time in Patent Office: 991 Days
• US Class Current: 1/1
• CPC Class Codes: A61B 17/3439 with means for changing the inner diameter of the cannula, e.g. expandable A61B17/3423, A61B17/3431 take precedence; catheters A61M25/0662
• CPC Class Codes: A61M 2025/0024 Expandable catheters or sheaths
• CPC Class Codes: A61M 2025/0687 having means for atraumatic insertion in the body or protection of the tip of the sheath during insertion, e.g. special designs of dilators, needles or sheaths
• CPC Class Codes: A61M 25/0023 by the form of the lumen, e.g. cross-section, variable diameter
• CPC Class Codes: A61M 25/005 with embedded materials for reinforcement, e.g. wires, coils, braids
• CPC Class Codes: A61M 25/0662 Guide tubes
• CPC Class Codes: A61M 39/0247 Semi-permanent or permanent transcutaneous or percutaneous access sites to the inside of the body peritoneal dialysis catheters A61M1/285; tracheostomy devices A61M16/0465; measuring pressure within the body A61B5/03; colostomy devices A61F5/445; gastrotomy feeding tubes A61J15/0015; means for fixing a feeding tube outside of the body A61J15/0053

Abstract

An elastic percutaneous elastic introducer sheath is disclosed which can locally expand and reduce to accommodate a transcatheter medical device. The elastic introducer sheath includes a non-circumferentially continuous wire structure, a liner, and a jacket.

Claims

1. A surgical access device comprising:

a sheath having an expandable section comprised of

a circumferentially continuous inner layer of a biocompatible material;

a non-circumferentially continuous wire structure defining along a length of the expandable section a plurality of first loop portions extending in a first radial direction and a plurality of second loop portions extending in a second radial direction, wherein respective first loop portions longitudinally overlap with respective second loop portions when the expandable section is in a collapsed configuration and wherein a longitudinal gap extends between respective first loop portions and respective second loop portions when the expandable section is in an expanded configuration; and

a non-circumferentially continuous outer layer of a biocompatible material, the outer layer being connected to the wire structure and to the inner layer to form a wall of the expandable section, the outer layer having a longitudinal gap when the expandable section is in the expanded configuration and having an overlap region when the expandable section is in the collapsed configuration.

2. The surgical access device of claim 1, wherein the wire structure is curved to form a C-shape in a radial direction.

3. The surgical access device of claim 1, wherein the wire structure has a sinusoid shaped wire pattern along a longitudinal direction.

4. The surgical access device of claim 1, wherein the wire structure has a square shaped wire pattern along a longitudinal direction.

5. The surgical access device of claim 1, wherein the sheath further comprises a proximal section having a first outer diameter that is greater than a second outer diameter of the expandable section.

6. The surgical access device of claim 5, wherein the sheath further comprises a transition section longitudinally positioned between the proximal section and the expandable section, the transition section providing a tapered outer diameter from the first outer diameter of the proximal section to the second outer diameter of the expandable section.

7. The surgical access device of claim 1, wherein when the expandable section is in the collapsed configuration a first fold in the inner layer is disposed around a first edge of the outer layer.

8. The surgical access device of claim 7, wherein when the expandable section is in the collapsed configuration a second fold in the inner layer is disposed inward of a second edge of the outer layer.

9. A locally expandable surgical access device comprising:

a sheath having an expandable section comprised of

a curved non-circumferentially continuous wire structure extending along a length of the expandable section, wherein a longitudinal gap is defined between first end portions of the wire structure and opposing second end portions of the wire structure in a collapsed configuration of the expandable section, and wherein a width of the longitudinal gap increases in an expanded configuration of the expandable section;

a non-circumferentially continuous outer layer connected to the wire structure, the outer layer having a longitudinally-extending first edge and a longitudinally extending second edge, wherein a longitudinal gap is defined between the longitudinally extending first and second edges of the outer layer in the expanded configuration of the expandable section and wherein an overlap region of the outer layer is defined between the longitudinally extending first and second edges of the outer layer in the collapsed configuration of the expandable section; and

a circumferentially continuous inner layer connected to the outer layer to form a wall of the expandable section, wherein the inner layer and the outer layer are formed from biocompatible materials.

10. The locally expandable surgical access device of claim 9, wherein the expandable section is expandable from a first diameter to a second diameter to allow passage of a transcatheter medical device.

11. The locally expandable surgical access device of claim 10, wherein the expandable section is reducible from the second diameter to a third diameter.

12. The locally expandable surgical access device of claim 11, wherein the third diameter is equal to the first diameter.

13. The locally expandable surgical access device of claim 9, the expandable section further comprising a first fold in the inner layer disposed around the first edge of the outer layer in the collapsed configuration of the expandable section.

14. The locally expandable surgical access device of claim 13, the expandable section further comprising a second fold in the inner layer disposed inward of the second edge of the outer layer in the collapsed configuration of the expandable section.

15. The locally expandable surgical access device of claim 14, wherein the first fold and the second fold of the inner layer unfold and flatten in the expanded configuration of the expandable section.

16. The locally expandable surgical access device of claim 9, wherein the wire structure includes a plurality of straight portions and a plurality of curved portions and wherein the first and second end portions are defined by the plurality of curved portions.

17. The locally expandable surgical access device of claim 9, wherein the wire structure has a sinusoid pattern.

18. The locally expandable surgical access device of claim 9, wherein the sheath further comprises a proximal section having a first outer diameter that is greater than a second outer diameter of the expandable section.

19. The locally expandable surgical access device of claim 18, wherein the sheath further comprises a transition section longitudinally positioned between the proximal section and the expandable section, the transition section providing a tapered outer diameter from the first outer diameter of the proximal section to the second outer diameter of the expandable section.