Electrosurgical system

A surgical instrument and electrode technology, which is applied in heating surgical instruments, medical science, surgical forceps, etc., can solve the problems of difficulty in realization and lack, and achieve the effect of reducing the lateral allowance.

Inactive Publication Date: 2004-02-04
GYRUS MEDICAL LTD
View PDF7 Cites 21 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The appeal is that there is almost no heat dissipation, but unfortuna

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Electrosurgical system
  • Electrosurgical system
  • Electrosurgical system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0045] With reference to the accompanying drawings, figure 1 is a graph showing the idealized behavior of tissue impedance versus time during application of bipolar r.f. energy. It can be seen that, as a result of the heating of the electrolyte, the impedance in the vicinity of the treated tissue decreases during the initial stages of energy application. A minimum value M is reached, and then, as the tissue dries out and becomes less conductive, the impedance begins to rise. Treatment of tissue coagulation preferably occurs near point M of least impedance. Continuing to transmit energy above the point M, due to the increase of steam generated, only serves to increase the lateral margin, increase the temperature of the applied electrode generally composed of a pair of tweezers, and increase the risk of tissue adhesion . Over a typical temperature range of 37°C to 100°C, increased ion mobility can result in a 60% decrease in impedance. However, in practice, the 60% reduction...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

An electrosurgical system has an electrosurgical generator and a bipolar electrosurgical instrument, the generator being arranged to perform a treatment cycle in which radio frequency energy is delivered to the instrument as an amplitude-modulated radio frequency power signal in the form of a succession of pulses characterized by periods of a least 100 milliseconds between successive pulses and by a predetermined pulse mark-to-space ratio. Energy delivery between pulses is substantially zero and the mark-to-space ratio is typically 1:4 or less. Each burst is of sufficiently high power to form vapor bubbles within tissue being treated and the time between successive pulses is sufficiently long to permit condensation of the vapor. The treatment cycles may each include an initial period and a subsequent period, the pulse duty cycle being increased or energy being delivered continuously in the subsequent period in order that tissue coagulation can be achieved quickly despite increasing tissue impedance.

Description

technical field [0001] The present invention relates to an electrosurgical instrument, an electrosurgical method, and an electrosurgical system. More specifically, the present invention provides a bipolar radiofrequency (r.f.) electrosurgical output characterized by faster, more controllable and More effective seal. Background technique [0002] The use of r.f. currents to perform resection and coagulation of body tissue has been known for many years and is widely described in the science of electrosurgery. Two techniques are commonly used today to deliver r.f. currents to tissue. [0003] The first technique, monopolar electrosurgery, involves the use of an active (tissue processing) electrode and a remote return (or neutral) electrode (or pad) placed on the external surface of the patient's body . Current flows from the active electrode through the target site and through any other tissue in the path between the target site and the return electrode. This arrangement l...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): A61B18/12A61B18/14
CPCA61B2018/00726A61B18/1233A61B2018/00702A61B2018/00875A61B2018/00666A61B18/1445A61B2018/00779
Inventor 科林·查尔斯·欧文·戈布尔
Owner GYRUS MEDICAL LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap