Shock wave device with polarity switching
AssigneeShockwave Medical, Inc.
InventorsVincent Wenchung Ku, Camilo Perez Saaibi
Life of this patent
Estimating the term…
Abstract
Described here are devices and methods for forming shock waves. The devices may comprise an axially extending elongate member. A first electrode pair may comprise a first electrode and a second electrode. The first electrode pair may be provided on the elongate member and positioned within a conductive fluid. A controller may be coupled to the first electrode pair. The controller may be configured to deliver a series of individual pulses to the first electrode pair, where each pulse creates a shock wave. The controller may cause current to flow through the electrode pair in a first direction for some of the pulses in the series and in a second direction opposite the first direction for the remaining pulses in the series.
Claims9
A shock wave device comprising:
- an axially extending elongate member configured to be advanced through a blood vessel to treat a calcified lesion;
- a first electrode assembly comprising a first electrode pair and a second electrode pair, wherein the first electrode assembly is carried by the axially extending elongate member and positioned within a conductive fluid;
- and
- a controller coupled to the first electrode assembly, wherein the controller is configured to deliver a series of individual voltage pulses to the first electrode assembly such that each of the voltage pulses in the series creates a shock wave in the conductive fluid to treat the calcified lesion,
- wherein the controller includes a voltage source having a constant polarity followed by a voltage polarity switch for switching the polarity of the voltage source and causing current to flow through the first electrode assembly in a first direction for some of the voltage pulses in the series and in a second direction opposite the first direction for the remaining voltage pulses in the seriesand,
- wherein the voltage polarity switch only operates between the delivery of the individual voltage pulses in the series so each voltage pulse delivered to the first electrode assembly has a single direction of current flow,
- wherein a first electrode in each of the first and second electrode pairs is coupled to the voltage polarity switch, and
- wherein the a second electrode in the first electrode pair is coupled to the a second electrode of the second electrode pair and wherein the first electrode in each of the first and second electrode pairs has a surface area smaller than a surface area of the associated second electrode in the first and second electrode pairs.
Dependencies are inferred from the claim text.