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US6770072: Electrosurgical jaw structure for controlled energy delivery

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Filing Information

Inventor(s) Csaba Truckai · James A. Baker · John H. Shadduck ·
Assignee(s) SurgRx, Inc. ·
Attorney/Agent(s) Townsend and Townsend and Crew LLP ·
Primary Examiner Roy D. Gibson ·
Assistant Examiner Aaron Roane ·
Application Number US10308362
Filing date 12/03/2002
Issue date 08/03/2004
Predicted expiration date 10/22/2021
U.S. Classifications 606/52  · 606/50  · 606/49  · 606/47  · 606/51  · 606/45  ·
International Classifications --
Kind CodeB1
International Classifications 606 49- 52 · 606 45 · 606 47 ·
Related U.S. Application DataCROSS-REFERENCE TO RELATED APPLICATIONS
This application claims benefit from Provisional U.S. Patent Application Ser. No. 60/337,695 filed Dec. 3, 2001 having the same title as above, which application is incorporated herein by this reference. This application is a Continuation-In-Part of co-pending U.S. patent application Ser. No. 10/032,867 filed Oct. 22, 2001 titled Electrosurgical Jaw Structure for Controlled Energy Delivery.
19 Claims, 22 Drawings


Abstract

A working end of a surgical instrument that carries first and second jaws for delivering energy to tissue. In a preferred embodiment, at least one jaw of the working end defines a tissue-engagement plane that contacts the targeted tissue. The cross-section of the engagement plane reveals that it defines a surface conductive portion and an elastomeric body portion. The elastomeric body portion is adapted to flex, deflect and extend laterally when engaging tissue to atraumatically engage tissue at the edges of the working end to create a smooth transition between welded tissue and undamaged tissue. The jaws can further carry a variably resistive matrix of a temperature-sensitive resistive material or a pressure-sensitive resistive material. An interior of the jaw carries a conductive material or electrode that is coupled to an Rf source and controller. In an exemplary embodiment, the variably resistive matrix can comprise a positive temperature coefficient (PTC) material, such as a ceramic, that is engineered to exhibit a dramatically increasing resistance (i.e., several orders of magnitude) above a specific temperature of the material. In use, the engagement plane will apply active Rf energy to captured tissue until the point in time that the variably resistive matrix is heated to its selected switching range. Thereafter, current flow from the conductive electrode through the engagement surface will be terminated due to the exponential increase in the resistance of variably resistive matrix to provide instant and automatic reduction of Rf energy application. Thus, the jaw structure can automatically modulate the application of energy to tissue between active Rf heating and passive conductive heating of captured tissue to maintain a target temperature level.

Independent Claims | See all claims (19)

  1. 1. A working end of a surgical instrument for delivering energy to tissue, comprising: paired first and second jaw members moveable between an open position and a closed position relative to an engagement plane; and at least one jaw having an electrically conductive inward portion extending along an axis and at least one outward portion extending in parallel to and laterally outside of said first inward portion; wherein the outward portion is more flexible than the inward portion so that the outward portion can flatten relative to the inward portion when engaging tissue on the engagement plane.
  2. 19. A method for controlled application of energy to tissue, comprising the steps of: providing a working end with opposing jaws for engaging tissue, at least one jaw having axially oriented inward and outward portions, wherein at least two said outward portions are disposed laterally on opposite sides of at least one inward portion and are composed of an elastomeric material; engaging tissue between the opposing jaws; and delivering RF energy to said tissue wherein said elastomeric material of the outward portions flexes to altraumatically engage the tissue at the outer edges of the inward portion.

References Cited

U.S. Patent Documents

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US5571153* Wallstén Nov 1996
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US5833690* Ethicon, Inc. Yates et al. Nov 1998
US6162220* Perfect Surgical Techniques, Inc. Nezhat Dec 2000
US6527767* New England Medical Center Wang et al. Mar 2003
* cited by examiner

Referenced By

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