Intravascular Treatment Site Access

• US 20170224953A1
• Filed: 02/10/2017
• Published: 08/10/2017
• Est. Priority Date: 02/10/2016
• Status: Active Grant

• Current Assignee: Microvention Incorporated (Terumo Corporation)
• Original Assignee: Microvention Incorporated (Terumo Corporation)
• Inventors: Gulachenski, Joseph A., Tran, Michelle, Sumida, Tetsu, Goyal, Mayank
• Granted Patent: US 10,682,493 B2
• Time in Patent Office: Days
• CPC Class Codes: A61B 17/221 Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions surgical snare instruments A61B17/32056
• CPC Class Codes: A61B 2017/22044 with a pointed tip
• CPC Class Codes: A61B 2017/2212 having a closed distal end, e.g. a loop
• CPC Class Codes: A61B 2017/2215 having an open distal end
• CPC Class Codes: A61M 2025/0042 Microcatheters, cannula or the like having outside diameters around 1 mm or less
• CPC Class Codes: A61M 2025/0046 Coatings for improving slidability
• CPC Class Codes: A61M 2025/0183 Rapid exchange or monorail catheters
• CPC Class Codes: A61M 2025/0681 Systems with catheter and outer tubing, e.g. sheath, sleeve or guide tube
• CPC Class Codes: A61M 2025/09116 Design of handles or shafts or gripping surfaces thereof for manipulating guide wires
• CPC Class Codes: A61M 2025/09166 having radio-opaque features
• CPC Class Codes: A61M 2025/09175 having specific characteristics at the distal tip
• CPC Class Codes: A61M 2205/0266 Shape memory materials
• CPC Class Codes: A61M 25/0023 by the form of the lumen, e.g. cross-section, variable diameter
• CPC Class Codes: A61M 25/0041 pre-formed, e.g. specially adapted to fit with the anatomy of body channels urethral catheters A61F2/04
• CPC Class Codes: A61M 25/0045 multi-layered, e.g. coated coating materials A61L29/08
• CPC Class Codes: A61M 25/0108 using radio-opaque or ultrasound markers
• CPC Class Codes: A61M 25/0662 Guide tubes
• CPC Class Codes: A61M 25/09 Guide wires
• CPC Class Codes: A61M 25/09016 with mandrils
• CPC Class Codes: A61M 25/09041 Mechanisms for insertion of guide wires
• CPC Class Codes: A61M 25/0905 : extendable, e.g. mechanisms for extension

Abstract

The embodiments presented herein relate to concepts designed to eliminate the gap between a catheter and guide wire that can otherwise contribute to a catheter getting stuck within the vasculature.

Claims

1. A microcatheter used to navigate through a blood vessel bifurcation region comprising:

a first section;

a second section distal of the first section, the second section outer diameter larger than the first section outer diameter; and

,

a distal tip distal of the second section, the distal tip outer diameter smaller than the second section outer diameter;

where the second section is configured to create an interface to minimize the open space between the microcatheter and an overlying guide catheter.

2. The microcatheter of claim 1 where the second section is 0.5 centimeters to 3 centimeters in length and 0.013 inches to 0.073 inches in diameter.

3. The microcatheter of claim 1 where the second section utilizes a lubricious coating.

4. The microcatheter of claim 1 where the second section has two marker bands.

5. The microcatheter of claim 4 where one marker band is placed at each end of the second section.

6. The microcatheter of claim 1 where the microcatheter inner diameter is consistent throughout the length of the microcatheter.

7. The microcatheter of claim 1 where the distal tip has one marker band.

8. The microcatheter of claim 1 where the distal tip outer diameter is equal to the first section outer diameter.

9. An implant delivery system configured to navigate past a vessel bifurcation region to access a treatment site comprising:

an implant;

a guide catheter;

a guidewire deployable through the guide catheter;

a microcatheter deployable through the guide catheter and over the guidewire, the implant deliverable through the microcatheter, the microcatheter having;

a first section;

a second section distal of the first section, the second section outer diameter larger than the first section outer diameter;

the second section of the microcatheter configured to create an interface to minimize the open space between the microcatheter and an overlying guide catheter; and

,

a distal tip distal of the second section, where the distal tip outer diameter is smaller than the second section outer diameter.

10. The microcatheter of claim 9 where the second section is 0.5 centimeters to 3 centimeters in length and 0.013 inches to 0.073 inches in diameter.

11. The microcatheter of claim 9 where the second section utilizes a lubricious coating.

12. The implant delivery system of claim 9 where the second section of the microcatheter has two marker bands.

13. The microcatheter of claim 12 where one marker band is placed at each end of the second section.

14. The implant delivery system of claim 9 wherein the microcatheter inner diameter is consistent throughout the length of the microcatheter.

15. The implant delivery system of claim 9 where the microcatheter distal tip has one marker band.

16. The implant delivery system of claim 9 wherein the microcatheter distal tip outer diameter is equal to the microcatheter first section outer diameter.

17. The implant delivery system of claim 9 wherein the implant is a clot retrieval device.

18. The implant delivery system of claim 17 wherein the clot retrieval device is a stentriever.

19. A method of delivering an implant past a vessel bifurcation region comprising:

tracking a guide catheter over a guidewire;

tracking a microcatheter over the guidewire and through the guide catheter so that the microcatheter sits distal of the guide catheter, the microcatheter having;

a first section;

a second section distal of the first section, where the second section outer diameter is greater than the first section outer diameter such that the second section is configured to create an interface to minimize the open space between the microcatheter and an overlying guide catheter; and

,

a distal tip distal of the second section, where the distal tip outer diameter is smaller than the second section outer diameter.

20. The method of claim 19 further comprising aligning the microcatheter relative to the guide catheter so that two marker bands in the distal section of the microcatheter sit on either side of guide catheter marker band.