Systems and methods for controlling laser pulsing

Patent metadata

Field	Value
Publication number	US-11955765-B2
Application number	US-202017032061-A
Country	US
Kind code	B2
Filing date	Sep 25, 2020
Priority date	Sep 27, 2019
Publication date	Apr 9, 2024
Grant date	Apr 9, 2024

Abstract

Techniques are provided for controlling an output laser pulse signal of a medical device. A control device defines a time duration of capacitive discharge to a laser device. The time duration corresponds to an intended energy of the output laser pulse signal. The control device generates a plurality of sub-pulse control signals. The sub-pulse control signals define a series of capacitive discharge events of the capacitor bank. The control device modulates one or more of a sub-pulse control signal period or a sub-pulse time duration of the sub-pulse control signals to modify the capacitive discharge of the capacitor bank to the laser device during the time duration.

First claim

We claim:

1. A method for controlling an output laser pulse signal of a medical device, the method comprising:
at a control device, defining a time duration of capacitive discharge of a capacitor bank to a laser device, wherein the time duration corresponds to an intended energy of the output laser pulse signal;
generating a pulse signal that defines a capacitive discharge event having a pulse width and a pulse period, wherein the pulse period is greater than the pulse width;
generating a control laser pulse signal that defines a plurality of sub-pulse control signals, wherein each of the sub-pulse control signals includes a plurality of the pulse signals and wherein each of the plurality of sub-pulse control signals are separated by a burst delay, wherein the burst delay is different than the difference of the separation of the plurality of sub-pulse control signals; and
modulating a duration of the burst delay to modify the capacitive discharge of the capacitor bank to the laser device during the time duration,
wherein the aggregate of the elapsed time of the sub-pulse control signals and the burst delays equals the time duration defined by the control device.

2. The method of claim 1 , wherein the sub-pulse control signal period corresponds to time elapsed between a start of the first sub-pulse control signal and a start of a subsequent sub-pulse control signal.

3. The method of claim 1 , wherein the sub-pulse time duration corresponds to time elapsed between a start of a selected sub-pulse control signal and an end of the selected sub-pulse control signal.

4. The method of claim 1 , further comprising controlling the output laser pulse signal by changing the time duration of the control laser pulse signal.

5. The method of claim 4 , wherein changing the time duration of the control laser pulse signal comprises changing the time duration of the control laser pulse signal to increase a time width of a peak output value of the output laser pulse signal.

6. The method of claim 1 further comprising changing a frequency of the sub-pulse control signals to produce an output laser pulse signal with periodic peak output values.

7. The method of claim 1 , wherein the sub-pulse control signals have a frequency of about 1 kHz to about 25 kHz.

Assignees

• Boston Scient Scimed Inc

Inventors

• Zhang Jian James
• Yang Baocheng
• Yang Xirong
• Kang Hyun Wook
• Cheng Brian
• Bull Peter
• Xuan Rongwei Jason
• Hasenberg Thomas C

Classifications

• H01S3/0912 Primary

  Electronics or drivers for the pump source, i.e. details of drivers or circuitry specific for laser pumping (laser diode drivers H01S5/042) · CPC title

• A61B18/26 Primary

  for producing a shock wave, e.g. laser lithotripsy · CPC title

• H01S3/061

  with elliptical or circular cross-section and elongated shape, e.g. rod · CPC title

• H01S3/092 Primary

  of flash lamp (H01S3/0937 takes precedence {; flash lamps per se H01J61/80; circuit arrangements for operating flash lamps in general H05B41/30}) · CPC title

• H01S3/161

  holmium · CPC title