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CA2605279A1 - Impedance feedback electrosurgical system and tool - Google Patents

Impedance feedback electrosurgical system and tool Download PDF

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Publication number
CA2605279A1
CA2605279A1 CA002605279A CA2605279A CA2605279A1 CA 2605279 A1 CA2605279 A1 CA 2605279A1 CA 002605279 A CA002605279 A CA 002605279A CA 2605279 A CA2605279 A CA 2605279A CA 2605279 A1 CA2605279 A1 CA 2605279A1
Authority
CA
Canada
Prior art keywords
tissue
impedance
tool
voltage
electrosurgical energy
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002605279A
Other languages
French (fr)
Other versions
CA2605279C (en
Inventor
Paul Nardella
David Yates
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Medical Scientific Inc
Ethicon Endo Surgery LLC
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority claimed from CA002161421A external-priority patent/CA2161421C/en
Publication of CA2605279A1 publication Critical patent/CA2605279A1/en
Application granted granted Critical
Publication of CA2605279C publication Critical patent/CA2605279C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

An impedance feedback electro-surgical system is useful with electro-surgical tools to maintain a preselected control range of tissue impedance within the tissue in contact with the tool. The system comprises an active electrode associated with an electro-surgical tool, a return electrode, in the form of a remote ground pad which is in contact with the patient, an impedance monitoring device and a power control unit. Energy sufficient to affect tissue is delivered through the active electrode to tissue and to the return electrode. The impedance measuring device determines the impedance of the tissue based on the voltage differential between the active electrode and ground pad. A signal representative of the measured impedance is communicated to the power control unit which adjusts the energy applied to the tissue to maintain a preselected impedance range.

Claims (6)

1. Use of a tool for controlling electrosurgical energy applied to tissue, said tool having an active contacting electrode in electrical communication with a power source and a remote contacting ground pad serving as a return electrode, said use comprising:
providing electrosurgical energy through the active electrode at a pre-selected magnitude;
communicating the electrosurgical energy applied to tissue through the return electrode to an impedance measuring device;
determining the impedance of the tissue from the voltage across the active electrode and the remote ground pad and from the current through the tissue;
communicating a signal representative of tissue impedance to a power control unit; and controlling the electrosurgical energy delivered through the active electrode based on the determined tissue impedance to maintain a determined tissue impedance within a preselected control range of tissue impedance.
2. The use of the tool as recited in claim 1 wherein the preselected control range of tissue impedance is in the range of 20 to 2000 Ohms.
3. The use of the tool as recited in claim 1 wherein the step of controlling the electrosurgical energy comprises the step of varying the voltage across the electrodes.
4. The use of the tool as recited in claim 1, further comprising the step of determining at least one of the following properties of the system (i) the time-rate derivative of the signal representative of impedance, (ii) the time-average of the voltage, (iii) the time-average of the current, )iv) the time-average of impedance, (v) current which exceeds a predetermined current threshold, and (vi) voltage which exceeds a predetermined voltage threshold.
5. The use of the tool as recited in claim 4, further comprising the step of processing any of the properties selectively to evaluate electrosurgical effects in the tissue and activating at least one logic indicator to indicate the evaluated effects.
6. The use of the tool as recite in claim 5 wherein the at least one logic indicator generates a visible light, audible sound, or tactile sensation.
CA2605279A 1993-04-30 1994-04-29 Impedance feedback electrosurgical system and tool Expired - Lifetime CA2605279C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US5582793A 1993-04-30 1993-04-30
US08/055,827 1993-04-30
CA002161421A CA2161421C (en) 1993-04-30 1994-04-29 Impedance feedback electrosurgical system

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA002161421A Division CA2161421C (en) 1993-04-30 1994-04-29 Impedance feedback electrosurgical system

Publications (2)

Publication Number Publication Date
CA2605279A1 true CA2605279A1 (en) 1994-11-10
CA2605279C CA2605279C (en) 2012-09-11

Family

ID=38830310

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2605279A Expired - Lifetime CA2605279C (en) 1993-04-30 1994-04-29 Impedance feedback electrosurgical system and tool

Country Status (1)

Country Link
CA (1) CA2605279C (en)

Also Published As

Publication number Publication date
CA2605279C (en) 2012-09-11

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Effective date: 20140429