EXPANDABLE INTRODUCER SHEATH

• US 20160074067A1
• Filed: 09/12/2014
• Published: 03/17/2016
• Est. Priority Date: 09/12/2014
• Status: Active Grant

• Current Assignee: Freudenberg Medical, LLC (Freudenberg & Company KG)
• Original Assignee: Helix Medical LLC (Freudenberg & Company KG)
• Inventors: Furnish, Simon, Appling, Anthony
• Granted Patent: US 9,801,657 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61B 17/34 Trocars; Puncturing needles pointed biopsy instruments A61B10/0233; devices for piercing the ear-lobes A44C7/001; seals or hemostasis valves A61M39/06
• CPC Class Codes: A61B 17/3415 for introducing tubes or catheters, e.g. gastrostomy tubes, drain catheters A61B17/3417 takes precedence; body piercing catheter guide needles A61M25/06
• CPC Class Codes: A61B 17/3431 being collapsible, e.g. made of thin flexible material A61B17/3423 takes precedence
• 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: A61B 17/3468 for implanting or removing devices, e.g. prostheses, implants, seeds, wires devices for implanting seeds A61M37/0069
• CPC Class Codes: A61B 2017/00853 low friction, hydrophobic and corrosion-resistant fluorocarbon resin coating (ptf, ptfe, polytetrafluoroethylene)
• CPC Class Codes: A61B 2017/00955 thermoplastic
• CPC Class Codes: A61M 2025/0024 Expandable catheters or sheaths
• CPC Class Codes: A61M 2205/0222 Materials for reducing friction
• 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 25/0052 Localized reinforcement, e.g. where only a specific part of the catheter is reinforced, for rapid exchange guidewire port
• CPC Class Codes: A61M 25/0662 Guide tubes

Abstract

An expandable introducer sheath for use in inserting a medical device into a body vessel of a patient includes a body which extends from a proximal end to a distal end along an axis. The body includes an inner layer, an outer layer, and an expandable reinforcement member which is disposed between said inner and outer layers. The expandable reinforcement member is configured to radially expand as the medical device is axially advanced or retracted through said introducer sheath. Once the medical device has exited the introducer sheath, the expandable reinforcement member facilitates a return of the introducer sheath to its original or unexpanded condition.

Claims

1. An expandable introducer sheath for use in inserting a medical device into a body vessel of a patient comprising:

a body extending from a proximal end to a distal end along an axis A;

said body including an inner layer, an outer layer, and an expandable reinforcement member disposed between said inner and outer layers; and

said expandable reinforcement member configured to radially expand as the medical device is axially advanced or retracted through the introducer sheath.

2. An expandable introducer sheath as set forth in claim 1, wherein said expandable reinforcement member includes a spine extending between said proximal and distal ends and a plurality of ribs extending radially from said spine and circumferentially about said axis A.

3. An expandable introducer sheath as set forth in claim 1, wherein said expandable reinforcement member includes a single wire which extends continuously between said proximal and distal ends.

4. An expandable introducer sheath as set forth in claim 3, wherein said single wire is wrapped to define a series of loops, with each of said loops in said series of loops extending circumferentially about said axis A and being interleaved between adjacent loops of said series of loops.

5. An expandable introducer sheath as set forth in claim 4, wherein said adjacent loops of said series of loops extend in opposite radial circumferential directions relative to one another for allowing said adjacent loops to slide relative to one another and effectuate radial expansion of said reinforcement member as the medical device is introduced into said introducer sheath.

6. An expandable introducer sheath as set forth in claim 1, wherein said expandable reinforcement member includes a plurality of struts disposed in spaced relationship to one another and each extending longitudinally between said proximal and distal ends and a plurality of linkages each extending radially between adjacent spines.

7. An expandable introducer sheath as set forth in claim 6, wherein said each of the linkages are radially expandable from their contracted or static position as a medical device is introduced into the introducer sheath, and are configured to return or spring back to the contracted position when the medical device exits the introducer sheath.

8. An expandable introducer sheath as set forth in claim 6, wherein said expandable reinforcement member is fabricated by laser cutting a tube.

9. An expandable introducer sheath as set forth in claim 1, wherein said expandable reinforcement member is comprised of a shape memory material to facilitate a return of said expandable reinforcement member to its unexpanded condition following an exit of the medical device from said introducer sheath.

10. An expandable introducer sheath as set forth in claim 9, wherein said expandable reinforcement member is comprised of Nitinol or stainless steel.

11. An expandable introducer sheath as set forth in claim 9, wherein said expandable reinforcement member is comprised of a rigid thermoplastic material.

12. An expandable introducer sheath as set forth in claim 1, wherein said inner layer is comprised of a lubricous, low friction polymeric material.

13. An expandable introducer sheath as set forth in claim 12, wherein said inner layer is comprised of expandable polytetrafluoroethylene (ePTFE).

14. An expandable introducer sheath as set forth in claim 1, wherein said outer layer is comprised of a thermoplastic material.

15. An expandable introducer sheath as set forth in claim 1, further comprising a protective sheath disposed in overlaying and surrounding relationship with said outer layer.

16. An expandable introducer sheath as set forth in claim 14, wherein said protective sheath is comprised of expandable polytetrafluoroethylene (ePTFE).

17. An expandable introducer sheath as set forth in claim 1, wherein said outer layer includes at least one slit which extends longitudinally and is disposed between said proximal and distal ends.

18. An expandable introducer sheath as set forth in claim 17, wherein said inner layer includes a fold disposed in aligned relationship with said at least one slit of said outer layer.

19. An expandable introducer sheath as set forth in claim 1, wherein said body includes an enlarged portion disposed adjacent said proximal end, said enlarged portion having a first diameter being complementary to the medical device.

20. An expandable introducer sheath as set forth in claim 19, wherein said body includes a tapered portion extending from said distal end to said enlarged portion, said tapered portion having a second diameter being smaller than said first diameter of said enlarged portion for providing a smaller profile of said introducer sheath to facilitate an initial insertion into the body vessel.