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GB2213381A Expired / Lapsed GB ⏱️ 0.0 years remaining

Electro-surgical apparatus with body impedance monitoring

Assignee: Cardiff University
•
Filing: 1987-12-12
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Granted: —
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Expires: 2007-12-12
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Abstract

Abstract Surgical diathermy apparatus including two electrodes to be applied to the patient's body under operation, and means for applying a high-frequency alternating current to the electrodes to perform electro-coagulation or surgery. The equipment also includes means for sensing the instantaneous values of the voltage and current between the electrodes and for calculating the impedance of the total circuit in accordance with these sensed values. An automatic detector senses any impedance value above a pre-determined level and is arranged to produce a warning or control signal. This enables a surgeon to perform delicate, difficult operations even when the operation site is out of view. <IMAGE>

Inventors

  • 👤 Martin Price-Thomas

Bibliographic Details

Application Number —
Jurisdiction GB
Data Source google_patents
Last Synchronized 2026-10-23 05:22
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/04; A61B18/12; A61B18/1206; A61B5/00; A61B5/05; A61B2018/00636; A61B2018/00696; A61B2018/00702; A61B2018/00773; A61B2018/00827; A61B2018/00875; A61B2018/00892

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 61 words
Surgical diathermy apparatus comprising two electrodes or probes to be applied to the body under operation and means for supplying an alternating current to the electrodes, with means for sensing the impedance of the body between the electrodes, and a sensor for detecting any value or change in impedance above a determined level and for producing a warning or control signal.
Claim 2
Dependent Claim 61 words
Surgical diathermy apparatus comprising two electrodes or probes to be applied to the body under operation and means for supplying an alternating current to the electrodes, with means for sensing the impedance of the body between the electrodes, and a sensor for detecting any value or change in impedance above a determined level and for producing a warning or control signal.
Claim 3
Dependent Claim 21 words
Apparatus according to Claim 1, including means for calculating the impedance in accordance with the voltage and current between the electrodes.
Claim 4
Dependent Claim 20 words
Apparatus according to Claim 2, including means for detecting the R.M.S. value of the voltage and/or current between the electrodes.
Claim 5
Dependent Claim 30 words
Apparatus according to any of the preceding claims, including means for maintaining a substantially constant voltage supply across the electrodes and means for sensing the value of the current flowing.
Claim 6
Dependent Claim 25 words
Apparatus according to any of the preceding claims, in which the apparatus is arranged to generate an audible or visual alarm and/or a warning display.
Claim 7
Dependent Claim 18 words
Apparatus according to Claim 5, in which the equipment includes a visual warning display adjacent the active electrode.
Claim 8
Dependent Claim 68 words
Surgical diathermy apparatus substantially in any of the forms described with reference to the accompanying drawings. 7. Apparatus according to any of the preceding claims, including a high-speed electrical switch in the circuit of the electrodes and means for automatically opening or adjusting the switch circuit in response to a predetermined change in the sensed impedance so as to shut off or modify the current in the electrode.

References Cited (Backward Citations)

GB855459A Cited
US3933157A Cited
US4372315A Cited
US4416276A Cited
US4416277A Cited
EP0136855A2 Cited

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