IP Library › Granted Patent US 12,426,938
Granted Patent B2
US 12,426,938 · App. 16/993,114 · Granted Sep 30, 2025

Low profile electrodes for a shock wave catheter

Inventors: Khanh Vo (Santa Clara, CA); Jonathan Gallego (Santa Clara, CA); Huy Phan (Santa Clara, CA)
Assignee: SHOCKWAVE MEDICAL, INC.
A61B18/14A61B18/1206A61B2017/22025A61B2018/00077A61B2018/00083A61B2018/0022A61B2018/00422A61B2018/1467
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Quick Facts
Patent No.
US 12,426,938
App. No.
16/993,114
Granted
Sep 30, 2025
Kind
B2
Abstract

The present invention provides a system and method for treating tight, hard-to-cross calcified lesions in which an angioplasty balloon is used to dilate the lesions and provide shock waves to restore normal blood flow in a patient's artery. An exemplary device includes an elongated tube and a balloon wrapped circumferentially around the tube and sealed to a distal end of the tube. During treatment, the device is advanced into a patient's vasculature and the balloon is inflated with conductive fluid such that the balloon is fixed to walls of the vasculature proximal to the calcified lesion. The balloon includes at least one low-profile emitter positioned near the distal end of the balloon, which may be activated to generate shock waves to break loose calcifications in the lesion. After calcium in the tight lesion has been modified, the balloon can be deflated and advanced further into the lesion to continue treatment.

Claims (41)

1. A device for generating shock waves, the device comprising:

an elongated tube;

a balloon wrapped circumferentially around a portion of the elongated tube, the balloon comprising:

a distal end sealed to the elongated tube,

a leg segment proximal to and extending directly from the distal end of the balloon,

a cone segment proximal to and extending directly from the leg segment of the balloon, and

a straight segment proximal to the cone segment of the balloon,

wherein, when the balloon is inflated: the leg segment is of a tapered shape with an average diameter, the cone segment is of a tapered shape with an average diameter greater than the average diameter of the leg segment, and the straight segment is of a substantially cylindrical shape with a diameter greater than the average diameter of the cone segment; and

a plurality of distal emitters configured to generate shock waves, wherein the plurality of distal emitters comprises at least two distal emitters positioned in the cone segment of the balloon, each of the at least two distal emitters positioned in the cone segment configured to generate shock waves such that shockwaves are generated at at least two different locations in the cone segment of the balloon, and wherein the plurality of distal emitters comprise at least one distal emitter positioned in the leg segment of the balloon.

2. The device of claim 1 , wherein the plurality of distal emitters comprises at least one distal emitter located between approximately 0.5 mm and approximately 1 mm from a distal end of a gap between the leg segment of the balloon and the elongated tube.

3. The device of claim 1 , wherein, when the balloon is inflated, a gap between an inner diameter of the leg segment and an outer diameter of the elongated tube is between around 0.001″ to around 0.003″.

4. The device of claim 1 , wherein the leg segment is less than approximately 3.5 mm long, and wherein the cone segment is approximately 4.5 mm to approximately 5.5 mm long.

5. The device of claim 1 , wherein, when the balloon is inflated, a first vertex angle between the leg segment of the balloon and the elongated tube is smaller than 5 degrees.

6. The device of claim 5 , wherein, when the balloon is inflated, a second vertex angle between the cone segment of the balloon and the elongated tube is larger than the first vertex angle.

7. The device of claim 1 , wherein the plurality of distal emitters comprises a first electrode pair, the first electrode pair comprising:

a conductive portion of a first insulated wire; and

a conductive portion of a second insulated wire.

8. The device of claim 7 , wherein the conductive portion of the first insulated wire is formed by removing a first portion of insulation from the first insulated wire, and wherein the conductive portion of the second insulated wire is formed by removing a second portion of insulation from the second insulated wire.

9. The device of claim 8 , wherein the first insulated wire comprises a flattened distal segment, and the first portion of insulation is removed from the flattened distal segment of the first insulated wire, and wherein the second insulated wire comprises a flattened distal segment, and the second portion of insulation is removed from the flattened distal segment of the second insulated wire.

10. The device of claim 9 , wherein a diameter of the flattened distal segment of the first insulated wire is approximately 47% to 75% of a diameter of a proximal segment of the first insulated wire, and wherein a diameter of the flattened distal segment of the second insulated wire is approximately 47% to 75% of a diameter of a proximal segment of the second insulated wire.

11. The device of claim 7 , wherein a layer of polymer covers at least a portion of the first insulated wire and the second insulated wire, such that the conductive portion of the first insulated wire is held a controlled distance apart from the conductive portion of the second insulated wire.

12. The device of claim 7 , wherein the plurality of distal emitters further comprises a second electrode pair, the second electrode pair comprising:

a further conductive portion of the second insulated wire; and

a conductive portion of a third insulated wire.

13. The device of claim 7 , wherein the plurality of distal emitters further comprises a second electrode pair and a third electrode pair, wherein the second electrode pair comprises:

a further conductive portion of the second insulated wire; and

a first side edge of a conductive sheath wrapped circumferentially around the elongated tube; and

wherein the third electrode pair comprises:

a second side edge of the conductive sheath; and

a conductive portion of a third insulated wire.

14. The device of claim 1 , wherein the plurality of distal emitters comprises a first electrode pair and a second electrode pair, wherein the first electrode pair comprises:

a conductive portion of a first insulated wire; and

a first side edge of a conductive sheath wrapped circumferentially around the elongated tube; and

wherein the second electrode pair comprises:

a second side edge of the conductive sheath; and

a conductive portion of a second insulated wire.

15. The device of claim 14 , wherein the first side edge and the second side edge are positioned circumferentially 180 degrees on opposite edges of the conductive sheath.

16. The device of claim 1 , wherein the elongated tube is tapered toward the distal end.

17. The device of claim 1 , further comprising:

at least one proximal emitter configured to generate shock waves, wherein the at least one proximal emitter is positioned in the straight segment of the balloon.

18. The device of claim 17 , further comprising a variable high voltage pulse generator selectively connected to the plurality of distal emitters and the at least one proximal emitter, wherein the variable high voltage pulse generator can be activated to generate shock waves at either the plurality of distal emitters or the at least one proximal emitter.

Assignments (3)
TERMINATION OF PATENT SECURITY AGREEMENT Recorded Jun 3, 2024
From: WELLS FARGO BANK, NATIONAL ASSOCIATION, AS ADMINISTRATIVE AGENT
To: SHOCKWAVE MEDICAL, INC.
Reel/Frame 067605/0799 →
SECURITY AGREEMENT Recorded Oct 20, 2022
From: SHOCKWAVE MEDICAL, INC.
To: WELLS FARGO BANK, NATIONAL ASSOCIATION
Reel/Frame 061728/0132 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 13, 2020
From: VO, KHANH; GALLEGO, JONATHAN; PHAN, HUY
To: SHOCKWAVE MEDICAL, INC.
Reel/Frame 054365/0320 →
Continuity (2)
Provisional Application 62904839 · Sep 24, 2019
Related Publication 20210085383A1 · Mar 25, 2021
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