Surgery – Instruments – Electrical application
Reexamination Certificate
2005-05-10
2005-05-10
Rollins, Rosiland (Department: 3739)
Surgery
Instruments
Electrical application
C128S898000
Reexamination Certificate
active
06890332
ABSTRACT:
A medical instrument coupled to first and second energy means and a computer controller for the controlled volumetric removal of thin tissue layers. The system provides a source for introducing a gas to controllably form and capture transient gas volumes in a microchannel structure at the working surface of the instrument that interfaces with a targeted tissue site. Each of the microchannel features of the working surface carries an electrode element coupled to the electrical source. The energy may be applied to the targeted site in either of two modes of operation, depending in part on voltage and repetition rate of energy delivery. In one mode of energy application, electrical potential is selected to cause an intense electrical arc across the transient ionized gas volumes to cause an energy-tissue interaction characterized by tissue vaporization. In another preferred mode of energy delivery, the system applies selected levels of energy to the targeted site by means of an energetic plasma at the instrument working surface to cause molecular volatilization of surface macromolecules thus resulting in material removal. Both modes of operation limit collateral thermal damage to tissue volumes adjacent to the targeted site. Another preferred embodiment provides and an ultrasound source or other vibrational source coupled to the working end to cause cavitation in fluid about the working end.
REFERENCES:
patent: 6394956 (2002-05-01), Chandrasekaran et al.
Shadduck John H.
Truckai Csaba
Rollins Rosiland
Townsend and Townsend / and Crew LLP
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