GB2052269A - Patient plate for electrosurgical unit - Google Patents

Patient plate for electrosurgical unit Download PDF

Info

Publication number
GB2052269A
GB2052269A GB8016812A GB8016812A GB2052269A GB 2052269 A GB2052269 A GB 2052269A GB 8016812 A GB8016812 A GB 8016812A GB 8016812 A GB8016812 A GB 8016812A GB 2052269 A GB2052269 A GB 2052269A
Authority
GB
United Kingdom
Prior art keywords
patient
plate
insulator
electroconductor
electrosurgical unit
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
GB8016812A
Other versions
GB2052269B (en
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.)
Mochida Pharmaceutical Co Ltd
Original Assignee
Mochida Pharmaceutical Co Ltd
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 Mochida Pharmaceutical Co Ltd filed Critical Mochida Pharmaceutical Co Ltd
Publication of GB2052269A publication Critical patent/GB2052269A/en
Application granted granted Critical
Publication of GB2052269B publication Critical patent/GB2052269B/en
Expired legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/14—Probes or electrodes therefor
    • A61B18/16—Indifferent or passive electrodes for grounding
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G13/00—Operating tables; Auxiliary appliances therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G7/00—Beds specially adapted for nursing; Devices for lifting patients or disabled persons
    • A61G7/05—Parts, details or accessories of beds
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/02—Details
    • A61N1/04—Electrodes
    • A61N1/06—Electrodes for high-frequency therapy
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/14—Probes or electrodes therefor
    • A61B18/16—Indifferent or passive electrodes for grounding
    • A61B2018/167—Passive electrodes capacitively coupled to the skin

Abstract

A patient (ground) plate (1) for an electrosurgical unit comprises a laminate of an electroconductor (2) formed from a thin film of a metal such as aluminium or metal net of fine, flexible mesh and soil sheets of insulator (3, 3') sandwiching said electroconductor,the laminate being formed to the area of an operating table on which the patient (5) will lie and so arranged that a high- frequency current will flow between the cutting edge (9) of the electrosurgical unit and the electroconductor (2) through the entire body of the patient (5). The upper sheet (3') is preferably vinyl chloride having a high dielectric constant, and a lower sheet (3) may be similar but is usually a urethane resin having a higher flexibility. The electroconductor (2) is vapour deposited on one of the sheets (3) of the insulator and then the other sheet (3') of insulator spread over it. The patient plate can be converted into a part of a bed. <IMAGE>

Description

SPECIFICATION Patient plate for electrosurgical unit This invention relates to a patient plate for an electrosurgical unit.
The conventional patient plates for this purpose have been formed from a metal plate of a size that corresponds to the buttocks of the patient, the metal plate being covered with a wet cloth impregnated with a saline solution or coated with an electroconductive gel in a way to ensure sufficient electrical contact between the body of the patient and the plate.
This conventional patient plate, however, has involved some serious problems. For example, the contact area between the patient's body and the patient plate is relatively small, so that it might occur that the patient plate will be contacted only partly by the patient's body particularly when the posture of the lying patient is biased to one side. In such a case, the current flowing into the patient plate from the cutting edge is so concentrated at the contacting part as to cause abnormal accumulation of heat in said part and give rise to a serious problem such as a burn on the patient's body. In particular, the patient, when under anesthesia for an operation, might sustain a serious injury as he cannot complain of the pain under such condition.Also, because of the relatively small contact area of the patient plate as stated above, care is required when attaching the plate to the patient's body. In addition, the plate must be separated from the patient's body after the operation.
The object of the invention is to overcome these problems.
According to the present invention a patient plate for an electrosurgical unit comprises a laminate formed from an electro-conductor sandwiched between soft sheets of insulator over the total area of the electro-conductor and being formed to the area of an operating table on which a patient will lie, thus being arranged so that a high-frequency current can flow between the cutting edge of the electrosurgical unit and the electroconductorthrough the entire body of the patient. The invention eliminates any possibility of causing a burn on the patient's body due to concentration of the electric current at a limited part, and because the plate is composed of an electroconductor between soft insulator sheets, the metal surface is not directly contacted by the patient's body thus avoiding patient discomfort caused by direct contact with the hard metal surface.
An operation can be performed by applying a high-frequency current between the cutting edge of the electrosurgical unit and the electroconductor, and further, after the operation, by merely turning off the switch of an electrosurgical unit, the patient plate can be immediately converted into a part of a bed.
The electroconductor used in this invention is preferably a thin film of a metal such as aluminium or metal net of flexible fine mesh vapour deposited on one of the sheets of insulator.
At least one of the sheets of insulator, which forms the upper portion of the patient plate and with which the patient's body contacts, is preferably formed from a vinyl chloride plate having a high dielectric constant. The other (or lower) sheet of insulator may be a vinyl chloride plate, but usually a material having a higher flexibility such as urethane resin is used. Because the ptient plate is formed to correspond to the size of an operating table it can be incorporated in a bed on which the ptient lies and can be used in that state.
Since this type of electrosurgical unit is usually used under conditions in which the operation is televised by an X-ray television for surgical operations, it is required that the fluoroscopic image should not be disturbed by the patient plate. This danger is eliminated when a metallic thin film or a metal net is used as the electroconductor, so that a clear image is always presented to the operator. In this case, the material for the insulator does not disturb X-ray images. Thus, a patient plate according to the invention can be used while incorporated in the patient's bed, and if necessary, an X-raytelevision unit may be adapted for use therewith. The impedance between the patient and the patient plate is lower than with a conventional patient plate, because the size is very considerably larger (more than ten times) than the conventional one.It also means, if this type of patient plate is used with an electrosurgical unit or other medical engineering instruments, the radio-frequency of real current through the electosurgical unit or through other instruments which are directly attached to a patient's body is reduced. In other words, the likelihood of causing a burn in this area is also less than under the conditions using a conventional patient plate. Additionally, a patient plate in accordance with the invention can use high dielectric material for its insulator sheets and can be thick enough so as not to be easily damaged, and so it can be used again and again.
An embodiment of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which: Figure 1 is a partly cutaway perspective view of a patient plate for an electrosurgical unit according to this invention; and Figure 2 is a diagrammatic part-sectional side elevation illustrating a mode of use of the device according to this invention.
The patient plate 1 shown in the drawings is composed of an electroconductor 2 and two sheets of insulator 3, 3' between which the electro conductor is sandwiched. For example, an aluminium thin film is vapour deposited over the entire surface of one side of the insulator sheet 3, and the other sheet of insulator 3' is spread over the thin film 2 to form a laminate. Flexible electroconductive plastic and other similar materials may be alternatively used as the electroconductor 2.
Various kinds of vapour depositable metals such as aluminium, copper, etc., may be used for forming the metallic thin film, but aluminium is preferred.
Also, a variety of materials such as flexible rubber, plastics, asbestos, etc., may be used as the insulator sheet on which the metallic thin film is to be evaporated, but vinyl chloride resin having a high dielectric constant is preferred.
Since a high-frequency electric current is applied to the electrosurgical unit according to this invention, the laminate is so arranged that an electric current may be passed between the cutting edge and the electroconductor through the insulator sheet 3.
The width a and length b of the device of this invention are predetermined so that the device can serve as an operating table which is conveniently incorporated in the bed which the patient uses.
The patient plate 1 is incorporated in a bed 4 so as to be serviceable as the operating table as shown in Figure 2, whereby the area of the plate contacting the patient 5 is strikingly enlarged compared with a conventional patient plate and the high-frequency current applied between the cutting edge 9 of the electrosurgical unit and the electroconductor 2 through insulator 3 passes through almost the entire body of the patient 5, thus eliminating any possibility of causing a burn or other problem due to concentration of the electric current.
Also, since the sheet-like insulators 3, 3' are soft members, the patient lying thereon has no sense of incompatability and the device can be laid out in the same manner as an ordinary mattress, so that there is no need to remove it after the operation, and it can be kept spread on the bed. In the case where a metallic thin film is used, even if an X-ray tube 7 and a a fluorescent multiplier tube 8 secured at the ends of a C-shaped arm 6 are placed in opposed relation with the patient plate 1 being disposed therebetween, there is no impediment to the obtaining of a fluoroscopic image of the patient and the operation can be performed effectively. Furthermore, the operator is freed from the trouble of constantly watching and/or adjusting the contact condition of the patient, for example, checking the condition of gauze, etc., impregnated with a saline solution, or the spread of an electroconductive gel as required in the case of the conventional patient plates, and hence the handling of the electrosurgical unit is greatly facilitated. Thus, the device of this invention is of high practical value.

Claims (9)

1. A patient plate for an electrosurgical unit comprising a laminate formed from an electrocon ductorsandwiched between soft sheets of insulator over the total area of the electroconductor and being formed to an area of an operating table on which a patient will lie, thus being arranged so that a high-frequency current can flow between the cutting edge of the electrosurgical unit and the electrocon ductorthrough the entire body of the patient.
2. A patient plate as in Claim 1, wherein the electroconductor is a metallic thin film vapour deposited on one sheet of insulator.
3. A patient plate as in Claim 1, wherein the electroconductor is a metal net of flexible, fine mesh vapour deposited on one sheet of insulator.
4. A patient plate as in Claim 2, wherein the metallic thin film is of aluminium.
5. A patient plate as in Claim 1, wherein a vinyl chloride plate having a high dielectric constant is used for forming at least one of the sheets of insulator.
6. A patient plate as in Claim 5, wherein the other sheet of insulator is formed from a vinyl chloride plate.
7. A patient plate as in Claim 5, wherein urethane resin is used to form the other sheet of insulator.
8. A patient plate as in any one of the preceding Claims, wherein said plate is adapted to serve as an operating table incorporated in a bed on which a patient will lie.
9. A patient plate for an electrosurgical unit substantially as hereinbefore described with reference to the accompanying drawings.
GB8016812A 1979-05-21 1980-05-21 Patient plate for electrosurgical unit Expired GB2052269B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6794079U JPS6238646Y2 (en) 1979-05-21 1979-05-21

Publications (2)

Publication Number Publication Date
GB2052269A true GB2052269A (en) 1981-01-28
GB2052269B GB2052269B (en) 1983-03-02

Family

ID=13359424

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8016812A Expired GB2052269B (en) 1979-05-21 1980-05-21 Patient plate for electrosurgical unit

Country Status (3)

Country Link
JP (1) JPS6238646Y2 (en)
DE (1) DE3019252C2 (en)
GB (1) GB2052269B (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT382785B (en) * 1982-10-18 1987-04-10 Rudolf Himmelsbach DEVICE FOR INFLUENCING BIOFREQUENCIES
FR2651989A1 (en) * 1989-05-10 1991-03-22 Archeny Jean Pierre Covering, paddings or mat for an operating table and radiology bench which conduct electricity and are permeable to X-rays, and their medical use
EP0991363A1 (en) * 1996-10-30 2000-04-12 Megadyne Medical Products, Inc. Capacitive reusable electrosurgical return electrode
EP1006904A1 (en) * 1996-10-30 2000-06-14 Megadyne Medical Products, Inc. Reusable electrosurgical return pad
EP1135073A1 (en) * 1998-11-30 2001-09-26 Megadyne Medical Products, Inc. Resistive reusable electrosurgical return electrode
EP1284671A1 (en) * 2000-05-12 2003-02-26 Megadyne Medical Products, Inc. Self-limiting electrosurgical return electrode
WO2003094766A2 (en) * 2002-05-09 2003-11-20 Megadyne Medical Products, Inc. Self-limiting electrosurgical return electrode
US7169145B2 (en) 2003-11-21 2007-01-30 Megadyne Medical Products, Inc. Tuned return electrode with matching inductor
US8876812B2 (en) 2009-02-26 2014-11-04 Megadyne Medical Products, Inc. Self-limiting electrosurgical return electrode with pressure sore reduction and heating capabilities
US9867650B2 (en) 2013-12-26 2018-01-16 Megadyne Medical Products, Inc. Universal self-limiting electrosurgical return electrode
US10085791B2 (en) 2013-12-26 2018-10-02 Megadyne Medical Products, Inc. Universal self-limiting electrosurgical return electrode

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5811269Y2 (en) * 1979-07-10 1983-03-02 城 根来 curtain opening/closing device

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU1388870A (en) * 1969-05-02 1971-10-21 Sybron Corporation Inactive electrode
GB1333573A (en) * 1969-10-15 1973-10-10 Milhench H L Electrode connector clamp and test for electrosurgical use
US3842394A (en) * 1973-03-06 1974-10-15 Medical Plastics Inc Electrical connector for plate electrode
US3972329A (en) * 1974-11-25 1976-08-03 Kaufman John George Body electrode for electro-medical use
DE2735050C3 (en) * 1977-08-03 1981-06-25 Siemens AG, 1000 Berlin und 8000 München electrode
US4200104A (en) * 1977-11-17 1980-04-29 Valleylab, Inc. Contact area measurement apparatus for use in electrosurgery

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT382785B (en) * 1982-10-18 1987-04-10 Rudolf Himmelsbach DEVICE FOR INFLUENCING BIOFREQUENCIES
FR2651989A1 (en) * 1989-05-10 1991-03-22 Archeny Jean Pierre Covering, paddings or mat for an operating table and radiology bench which conduct electricity and are permeable to X-rays, and their medical use
US6666859B1 (en) 1996-10-30 2003-12-23 Megadyne Medical Products, Inc. Self-limiting electrosurgical return electrode
EP0991363A1 (en) * 1996-10-30 2000-04-12 Megadyne Medical Products, Inc. Capacitive reusable electrosurgical return electrode
EP1006904A1 (en) * 1996-10-30 2000-06-14 Megadyne Medical Products, Inc. Reusable electrosurgical return pad
EP1006904A4 (en) * 1996-10-30 2000-06-14 Megadyne Med Prod Inc Reusable electrosurgical return pad
US7367971B2 (en) 1996-10-30 2008-05-06 Megadyne Medical Products, Inc. Self-limiting electrosurgical return electrode
EP0991363A4 (en) * 1996-10-30 2000-04-12 Megadyne Med Prod Inc Capacitive reusable electrosurgical return electrode
US7166102B2 (en) 1996-10-30 2007-01-23 Megadyne Medical Products, Inc. Self-limiting electrosurgical return electrode
EP1135073A4 (en) * 1998-11-30 2003-01-15 Megadyne Med Prod Inc Resistive reusable electrosurgical return electrode
EP1135073A1 (en) * 1998-11-30 2001-09-26 Megadyne Medical Products, Inc. Resistive reusable electrosurgical return electrode
JP2009066426A (en) * 1998-11-30 2009-04-02 Megadyne Medical Products Inc Resistive reusable electrosurgical return electrode
EP1284671A4 (en) * 2000-05-12 2005-08-17 Megadyne Med Prod Inc Self-limiting electrosurgical return electrode
EP1284671A1 (en) * 2000-05-12 2003-02-26 Megadyne Medical Products, Inc. Self-limiting electrosurgical return electrode
WO2003094766A2 (en) * 2002-05-09 2003-11-20 Megadyne Medical Products, Inc. Self-limiting electrosurgical return electrode
WO2003094766A3 (en) * 2002-05-09 2004-02-12 Megadyne Med Prod Inc Self-limiting electrosurgical return electrode
US7169145B2 (en) 2003-11-21 2007-01-30 Megadyne Medical Products, Inc. Tuned return electrode with matching inductor
US7837680B2 (en) 2003-11-21 2010-11-23 Megadyne Medical Products, Inc. Tuned return electrode with matching inductor
US8876812B2 (en) 2009-02-26 2014-11-04 Megadyne Medical Products, Inc. Self-limiting electrosurgical return electrode with pressure sore reduction and heating capabilities
US9867650B2 (en) 2013-12-26 2018-01-16 Megadyne Medical Products, Inc. Universal self-limiting electrosurgical return electrode
US10085791B2 (en) 2013-12-26 2018-10-02 Megadyne Medical Products, Inc. Universal self-limiting electrosurgical return electrode
US11464560B2 (en) 2013-12-26 2022-10-11 Megadyne Medical Products, Inc. Universal self-limiting electrosurgical return electrode

Also Published As

Publication number Publication date
GB2052269B (en) 1983-03-02
DE3019252C2 (en) 1983-01-27
JPS6238646Y2 (en) 1987-10-02
JPS55168317U (en) 1980-12-03
DE3019252A1 (en) 1980-11-27

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PCNP Patent ceased through non-payment of renewal fee