Granted Patent B2

US 12,533,145 · App. 17/859,955 · Granted Jan 27, 2026

Inventors: Tony M. Chou (San Mateo, CA); Scott D. Wilson (San Mateo, CA)

Assignee: Route 92 Medical, Inc.

A61B17/22A61B17/221A61M25/0053A61M25/0068A61M25/01A61M25/04A61M25/0662A61B2017/00986A61B2017/22047A61B2017/22049A61B2017/22069A61M1/87A61M2025/0681A61M2025/09125A61M2205/584

Abstract

Claims (28)

1 . A catheter system comprising:

a neurovascular catheter comprising a catheter lumen and a distal end; and

an intravascular catheter advancement device for advancing the neurovascular catheter, the catheter advancement device comprising:

a flexible elongate body having a proximal end with a proximal opening, a distal end with a distal opening, and a single lumen extending between the proximal opening and the distal opening having an inner diameter sized to receive a guidewire and that is less than 0.024″, the flexible elongate body comprising:

a proximal segment;

an intermediate wall segment connected to the proximal segment and comprising a polymer having a first durometer, wherein a location of a material transition between the intermediate segment and the proximal segment is at least 49 cm from the distal end; and

an unreinforced wall segment distal of the intermediate wall segment formed of a polymer different from the polymer of the intermediate wall segment, the polymer of the unreinforced wall segment having a second durometer less than the first durometer, wherein the unreinforced wall segment has a tapered portion that tapers distally from a first outer diameter to a second outer diameter over a length between 0.5 cm and 4.0 cm,

wherein the flexible elongate body has a length configured to extend from outside a patient's body, through a point of insertion in a peripheral artery, and to a middle cerebral artery circulation and wherein the catheter advancement device is configured to navigate to the middle cerebral artery circulation without applying straightening forces on the neurovasculature, and

wherein a flexibility of the unreinforced wall segment at the distal end of the flexible elongate body is greater than a flexibility of the distal end of the neurovascular catheter.

2 . The system of claim 1 , wherein the tapered portion is formed entirely of the same polymer.

3 . The system of claim 1 , wherein the proximal segment comprises a hypotube.

4 . The system of claim 3 , wherein the hypotube has a cut side wall.

5 . The system of claim 1 , wherein the proximal segment comprises a reinforced polymer with metallic or non-metallic braid or coil.

6 . The system of claim 1 , wherein the proximal segment is reinforced by a coiled ribbon.

7 . The system of claim 1 , wherein the proximal segment has an outer diameter that is less than an outer diameter of the intermediate wall segment.

8 . The system of claim 1 , wherein the proximal segment is covered with a lubricious polymer.

9 . The system of claim 1 , wherein an inner diameter of the intermediate wall segment and the unreinforced wall segment distal of the intermediate wall segment is constant.

10 . The system of claim 1 , wherein a wall thickness of the intermediate wall segment and an untapered portion of the unreinforced wall segment is constant.

11 . The system of claim 1 , wherein the flexible elongate body further comprises a reinforced wall segment.

12 . The system of claim 11 , wherein the reinforced wall segment comprises a metallic structure extending a length of the flexible elongate body.

13 . The system of claim 12 , wherein the metallic structure of the reinforced wall segment extends up to the unreinforced wall segment.

14 . The system of claim 12 , wherein the metallic segment comprises a coil or a braid.

15 . The system of claim 1 , wherein the flexible elongate body further comprises an inner liner.

16 . The system of claim 1 , wherein the flexible elongate body comprises no inner liner, and wherein the polymer of the intermediate wall segment comprises a lubricious additive incorporated within the polymer of the intermediate wall segment.

17 . The system of claim 1 , wherein the flexible elongate body comprises no inner liner, and wherein the polymer of the unreinforced wall segment comprises a lubricious additive incorporated within the polymer of the unreinforced wall segment.

18 . The system of claim 1 , wherein the first outer diameter of the tapered portion is 0.080 inch to 0.082 inch.

19 . The system of claim 1 , wherein the first outer diameter of the tapered portion is 0.062 inch to about 0.080 inch.

20 . The system of claim 1 , wherein a difference between the first outer diameter and an inner diameter of the catheter lumen is no more than about 0.010 inch.

Assignments (1)

Continuity (22)

References Cited (400)