Method for plasma-mediated thermo-electrical ablation with low temperature electrode
First Claim
1. A method for cutting of biological tissue comprising:
- applying a pulse waveform to a cutting electrode wherein the pulse waveform includes a plurality of pulses and has a duty cycle of less than 10%, wherein the cutting electrode has a peak temperature during application of the pulse waveform of greater than 100°
C. and an average temperature during application of the pulse waveform of less than about 100°
C.; and
cutting the tissue with the cutting electrode during application of the pulse waveform while preventing thermal damage to the tissue.
2 Assignments
0 Petitions
Accused Products
Abstract
Described herein are methods and apparatus for cutting a material including biological tissue. The apparatus has a cutting electrode with an elongate cutting portion. A voltage pulse waveform (typically comprising repeated bursts of minipulses) having a low or very low duty-cycle is applied to the cutting electrode to cut the tissue or other material by producing a vapor cavity around the cutting portion of the electrode and ionizing a gas inside the vapor cavity to produce a plasma. A low duty cycle cutting waveform may prevent heat accumulation in the tissue, reducing collateral thermal damage. The duration of the burst of minipulses typically ranges from 10 μs to 100 μs, and the rep rate typically ranges from 1 KHz to 10 Hz, as necessary. The apparatus and method of invention may cut biological tissue while decreasing bleeding and maintaining a very shallow zone of thermal damage.
-
Citations
19 Claims
-
1. A method for cutting of biological tissue comprising:
- applying a pulse waveform to a cutting electrode wherein the pulse waveform includes a plurality of pulses and has a duty cycle of less than 10%, wherein the cutting electrode has a peak temperature during application of the pulse waveform of greater than 100°
C. and an average temperature during application of the pulse waveform of less than about 100°
C.; and
cutting the tissue with the cutting electrode during application of the pulse waveform while preventing thermal damage to the tissue. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- applying a pulse waveform to a cutting electrode wherein the pulse waveform includes a plurality of pulses and has a duty cycle of less than 10%, wherein the cutting electrode has a peak temperature during application of the pulse waveform of greater than 100°
-
11. A method of cutting and hemostasis of a biological tissue, the method comprising:
- contacting a biological tissue with a cutting electrode, applying a pulse waveform to the cutting electrode wherein the pulse waveform includes a plurality of pulses and has a duty cycle of less than 10%, wherein the cutting electrode has a peak temperature during application of the pulse waveform of greater than 100°
C. and an average temperature during application of the pulse waveform of less than about 100°
C.; and
cutting the tissue with the cutting electrode during application of the pulse waveform while at least partially constricting the blood vessels adjacent to the cut tissue while preventing thermal damage to the tissue. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
- contacting a biological tissue with a cutting electrode, applying a pulse waveform to the cutting electrode wherein the pulse waveform includes a plurality of pulses and has a duty cycle of less than 10%, wherein the cutting electrode has a peak temperature during application of the pulse waveform of greater than 100°
Specification