US20050143795A1 - Applicator for microwave radiation treatment - Google Patents

Applicator for microwave radiation treatment Download PDF

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Publication number
US20050143795A1
US20050143795A1 US11/055,858 US5585805A US2005143795A1 US 20050143795 A1 US20050143795 A1 US 20050143795A1 US 5585805 A US5585805 A US 5585805A US 2005143795 A1 US2005143795 A1 US 2005143795A1
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United States
Prior art keywords
needles
tissue
array
organ
applicator
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.)
Abandoned
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US11/055,858
Inventor
Nagy Habib
Alan Sangster
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Emcision Ltd
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Imperial College Innovations Ltd
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Application filed by Imperial College Innovations Ltd filed Critical Imperial College Innovations Ltd
Priority to US11/055,858 priority Critical patent/US20050143795A1/en
Publication of US20050143795A1 publication Critical patent/US20050143795A1/en
Assigned to EMCISION LIMITED reassignment EMCISION LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: IMPERIAL INNOVATIONS LIMITED (FORMERLY IMPERIAL COLLEGE INNOVATIONS, LTD)
Priority to US12/858,519 priority patent/US20100312237A1/en
Abandoned legal-status Critical Current

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    • 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
    • A61B18/18—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves
    • A61B18/1815—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using microwaves
    • 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
    • A61B18/18—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/02—Radiation therapy using microwaves
    • A61N5/04—Radiators for near-field treatment
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/02—Radiation therapy using microwaves
    • A61N5/04—Radiators for near-field treatment
    • A61N5/045—Radiators for near-field treatment specially adapted for treatment inside the body

Definitions

  • This invention relates to a device for use in the surgical treatment of human or non-human animals.
  • it is concerned with a device for use in controlling excessive bleeding from severed tissue during surgical procedures, especially on the patient's liver.
  • the present invention aims to provide a device for providing localised heating of a selected region of body tissue prior to surgical incision of that tissue.
  • a device for generating localised heating in a selected body tissue which device comprises an applicator including a source of microwave radiation and an array of retractable needles arranged so as to extend from one face of the applicator and, in operation, to confine the irradiated microwave energy field emanating from the applicator.
  • the invention also provides the use of the device as defined above for restricting the loss of blood during a surgical procedure on the human or animal body.
  • a method of controlling excessive bleeding comprising inserting an array of needles into the tissue or organ being treated; and applying microwave energy to the region undergoing treatment for a time sufficient to raise the temperature of said tissue or organ by 20-30 degrees C.
  • the source of microwave radiation is in the form of a rectangular waveguide whose dimensions correspond to those of the tissue volume which is to be heated.
  • the waveguide is preferably generally rectangular in form, the array of retractable needles being positioned around the periphery of the waveguide.
  • the device may include a needle advance mechanism including a collar to which the needles are secured; movement of said collar may be actuated by a solenoid mechanism.
  • the needles will be advanced from the body of the applicator into the tissue which is to be heated so that the needles function as a extension of the waveguide; in this way, the applicator will direct the required microwave energy into the appropriate tissue volume prior to surgery.
  • the needles are retracted back into the body of the applicator.
  • the needles will be disposed mutually parallel; they can conveniently be formed of steel.
  • FIG. 1 is a schematic representation of an applicator in accordance with this invention
  • FIG. 2 is a cross-sectional view of the applicator head of FIG. 1 ;
  • FIG. 3 is an end elevational view corresponding to FIGS. 1 and 2 .
  • a power and control unit ( 1 ) supplies up to 500 watts of microwave power via a coaxial cable ( 2 ) to a rectangular applicator ( 3 ).
  • the head ( 3 ) has a handle ( 4 ) through which cable ( 2 ) passes, and an array ( 5 ) of retractable needles which are designed to provide precise irradiation of the tissue in the vicinity of the selected incision point.
  • the unit ( 1 ) also contains a switching mechanism and control electronics to energise and release the array of needles.
  • the applicator head ( 3 ) includes a rectangular waveguide ( 6 ) around the periphery of which the needles of array ( 5 ) are located.
  • the waveguide is a TM 11 mode waveguide and is filled with a suitable dielectric.
  • the rectangular waveguide should have corresponding dimensions and may be filled with a medium whose dielectric constant ( ⁇ x ) is about 50. These parameters dictate that the microwave operating frequency should be of the order of 1 GHz.
  • each of the needles is 3 cm long and made of steel. When the applicator is in operation, these needles will be advanced into the tissue where they function as an extension to the waveguide.
  • a typical needle array may comprise about 20 needles.
  • FIG. 2 also shows a collar ( 8 ) to which each of the needles of the array ( 5 ) are secured. Collar ( 8 ) is acted upon by spring ( 9 ) which forms part of a solenoid mechanism ( 10 ) for controlling the advance and retraction of the array of needles. Power is supplied to the solenoid mechanism ( 10 ) via cable ( 11 ). As illustrated in FIG. 2 , coaxial line ( 2 ) terminates within the dielectric-filled waveguide ( 6 ).
  • a surgeon will position the applicator head ( 3 ) against the region of tissue (e.g. liver) which is about to be incised. Initially the needle array ( 5 ) is retracted within head ( 3 ). When the applicator is actuated, solenoid mechanism ( 10 ) causes the needles of array ( 5 ) to be extended into the patient's tissue. Once they are embedded in the tissue, microwave energy at the desired frequency (e.g. 1 GHz) is supplied to waveguide ( 6 ) and passes therefrom into the volume of tissue enclosed by the array ( 5 ) of needles.
  • the desired frequency e.g. 1 GHz
  • Energy is supplied at a typical power level of 500 watts for a duration of about 15 secs when an applicator of the dimensions 5 cm ⁇ 2 cm and a needle length of 3 cm is used.
  • the microwave source is switched off and needle array ( 5 ) is retracted. The surgeon may then proceed with the incision and any subsequent procedures as may be necessary.

Abstract

A device for restricting the loss of blood during a surgical procedure is disclosed. The device generates localized heating in an organ or volume of tissue and includes an applicator that is positioned against an organ or tissue to be treated, an array of retractable needles that deliver irradiating energy in the vicinity of a selected incision point; a switching mechanism in communication with the needles for energizing and causing movement of the needles and a power unit for supplying irradiating power to the needles when extended into the organ or tissue.

Description

    RELATED APPLICATIONS
  • This application is a divisional of U.S. patent application Ser. No. 10/625,232, filed Jul. 22, 2003, which is a continuation of U.S. patent application Ser. No. 09/762,285, filed Apr. 6, 2001, now U.S. Pat. No. 6,628,990, which is a national stage application of International Patent Application No. PCT/GB99/02559, filed Aug. 4, 1999, which claims priority from GB Patent Application No. 9817078.0, filed Aug. 5, 1998.
    • FIELD OF THE INVENTION
  • This invention relates to a device for use in the surgical treatment of human or non-human animals. In particular, it is concerned with a device for use in controlling excessive bleeding from severed tissue during surgical procedures, especially on the patient's liver.
    • BACKGROUND OF THE INVENTION
  • It is well known that raising the temperature of body tissue tends to reduce blood flow within the tissue. If the temperature is raised by 20-30° C. above normal, blood flow within the tissue is greatly diminished.
  • In surgical procedures performed on deep-seated body tissues and organs, e.g. the liver, blood loss from severed tissue can be a serious problem. There is an obvious need for a device which can assist in limiting such blood loss and, as indicated above, this can be achieved by means of the application of heat. Widespread heating can be achieved relatively easily, but this is not desirable. Very localised heating is required in order to minimise damage to surrounding tissues. In liver surgery, local heating of the liver is ideally required in a tissue volume approximately 5 cm long by 2 cm wide by 4 cm deep; this volume is centred on the planned point of incision. Furthermore, it is important for the local elevation of temperature to be achieved quickly just prior to commencing the surgical procedure.
    • SUMMARY OF THE INVENTION
  • The present invention aims to provide a device for providing localised heating of a selected region of body tissue prior to surgical incision of that tissue.
  • According to one aspect of the present invention, there is provided a device for generating localised heating in a selected body tissue, which device comprises an applicator including a source of microwave radiation and an array of retractable needles arranged so as to extend from one face of the applicator and, in operation, to confine the irradiated microwave energy field emanating from the applicator.
  • The invention also provides the use of the device as defined above for restricting the loss of blood during a surgical procedure on the human or animal body.
  • According to another aspect of the present invention, there is provided, in the surgical treatment of the human or animal body, a method of controlling excessive bleeding, the method comprising inserting an array of needles into the tissue or organ being treated; and applying microwave energy to the region undergoing treatment for a time sufficient to raise the temperature of said tissue or organ by 20-30 degrees C.
  • Conveniently, the source of microwave radiation is in the form of a rectangular waveguide whose dimensions correspond to those of the tissue volume which is to be heated. The waveguide is preferably generally rectangular in form, the array of retractable needles being positioned around the periphery of the waveguide.
  • The device may include a needle advance mechanism including a collar to which the needles are secured; movement of said collar may be actuated by a solenoid mechanism.
  • In operation of the device, the needles will be advanced from the body of the applicator into the tissue which is to be heated so that the needles function as a extension of the waveguide; in this way, the applicator will direct the required microwave energy into the appropriate tissue volume prior to surgery. When the heating process is completed, the needles are retracted back into the body of the applicator.
  • Generally, the needles will be disposed mutually parallel; they can conveniently be formed of steel.
  • Theoretical calculations show that, in order to raise the temperature of body tissues by 30° C., an applicator operating with 100% efficiency would need to deliver about 10 watts of microwave power, assuming that the volume to be heated is 40 cm3. For a typical biological tissue such as muscle, this temperature rise would be achieved in approximately 10 minutes. If the source is increased in energy to 500 watt, and if the applicator is assumed to be about 80% efficient, the time taken to achieve this required temperature increase is approximately 15 seconds.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • For a better understanding of the invention, and to show how the same may be carried into effect, reference will now be made, by way of example, to the accompanying drawings, in which:
  • FIG. 1 is a schematic representation of an applicator in accordance with this invention;
  • FIG. 2 is a cross-sectional view of the applicator head of FIG. 1;
  • FIG. 3 is an end elevational view corresponding to FIGS. 1 and 2.
    • DETAILED DESCRIPTION
  • Referring now to the drawings, a power and control unit (1) supplies up to 500 watts of microwave power via a coaxial cable (2) to a rectangular applicator (3). The head (3) has a handle (4) through which cable (2) passes, and an array (5) of retractable needles which are designed to provide precise irradiation of the tissue in the vicinity of the selected incision point. The unit (1) also contains a switching mechanism and control electronics to energise and release the array of needles.
  • As shown in FIGS. 2 and 3, the applicator head (3) includes a rectangular waveguide (6) around the periphery of which the needles of array (5) are located. The waveguide is a TM11 mode waveguide and is filled with a suitable dielectric. For irradiation of a region 5 cm long by 2 cm wide, the rectangular waveguide should have corresponding dimensions and may be filled with a medium whose dielectric constant (∈x) is about 50. These parameters dictate that the microwave operating frequency should be of the order of 1 GHz. The specific values given here are by of example only; it will be appreciated that a range of applicators designed to irradiate different volumes of tissue may be developed and these, of necessity, will have different dimensions and may require a different dielectric medium and a different operating frequency from that given above. In the illustrated embodiment, each of the needles is 3 cm long and made of steel. When the applicator is in operation, these needles will be advanced into the tissue where they function as an extension to the waveguide. A typical needle array may comprise about 20 needles. By employing a TM mode waveguide, leakage of energy through the “needle wall”—i.e., the area bounded by the array of needles—is kept to a low level (typically less than 10%) .
  • FIG. 2 also shows a collar (8) to which each of the needles of the array (5) are secured. Collar (8) is acted upon by spring (9) which forms part of a solenoid mechanism (10) for controlling the advance and retraction of the array of needles. Power is supplied to the solenoid mechanism (10) via cable (11). As illustrated in FIG. 2, coaxial line (2) terminates within the dielectric-filled waveguide (6).
  • In operation, a surgeon will position the applicator head (3) against the region of tissue (e.g. liver) which is about to be incised. Initially the needle array (5) is retracted within head (3). When the applicator is actuated, solenoid mechanism (10) causes the needles of array (5) to be extended into the patient's tissue. Once they are embedded in the tissue, microwave energy at the desired frequency (e.g. 1 GHz) is supplied to waveguide (6) and passes therefrom into the volume of tissue enclosed by the array (5) of needles. Energy is supplied at a typical power level of 500 watts for a duration of about 15 secs when an applicator of the dimensions 5 cm×2 cm and a needle length of 3 cm is used. At the end of the treatment period, the microwave source is switched off and needle array (5) is retracted. The surgeon may then proceed with the incision and any subsequent procedures as may be necessary.
  • Blood loss from incision of tissue after heat treatment as described is greatly reduced in comparison to the results obtained in the absence of such heat treatment.

Claims (8)

1. A device for restricting the loss of blood during a surgical procedure comprising:
(i) an applicator having a face for positioning against an organ or tissue to be treated;
(ii) an array of retractable needles extending from said face capable of irradiating said organ or tissue to be treated in a vicinity of a selected incision point;
(iii) a switching mechanism in communication with said array of retractable needles for energizing and releasing said array of retractable needles;
(iv) and a power unit in communication with said array of retractable needles for supplying irradiating power to said needles when extended into said organ or tissue in the vicinity of the selected incision point.
2. The device of claim 1 wherein the power unit supplies sufficient power for a period required to raise the temperature of said organ or tissue in the vicinity of the selected incision point by about 20° C. to about 30° C.
3. The device of claim 1 wherein said array of retractable needles provide local heating of the organ or tissue within a volume approximately 5 cm long, 2 cm wide and 4 cm deep.
4. The device of claim 1 wherein the applicator includes a collar to which the array of retractable needles are secured.
5. The device of claim 4 wherein movement of the needles is effected by a solenoid mechanism acting on the collar.
6. The device of claim 5 wherein the solenoid mechanism includes a spring for effecting movement of said needles.
7. The device of claim 1 wherein the power is microwave power.
8. The device of claim 1 wherein the needle array comprises about twenty needles.
US11/055,858 1998-08-05 2005-02-11 Applicator for microwave radiation treatment Abandoned US20050143795A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US11/055,858 US20050143795A1 (en) 1998-08-05 2005-02-11 Applicator for microwave radiation treatment
US12/858,519 US20100312237A1 (en) 1998-08-05 2010-08-18 Electrosurgical device for restricting loss of blood during surgery

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
GBGB9817078.0A GB9817078D0 (en) 1998-08-05 1998-08-05 Device for liver surgery
GB9817078.0 1998-08-05
PCT/GB1999/002559 WO2000007666A1 (en) 1998-08-05 1999-08-04 Applicator for microwave radiation treatment
US09/762,285 US6628990B1 (en) 1998-08-05 1999-08-04 Applicator for microwave radiation treatment
US10/625,232 US20060047274A1 (en) 1998-08-05 2003-07-22 Applicator for microwave radiation treatment
US11/055,858 US20050143795A1 (en) 1998-08-05 2005-02-11 Applicator for microwave radiation treatment

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US10/625,232 Division US20060047274A1 (en) 1998-08-05 2003-07-22 Applicator for microwave radiation treatment

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/858,519 Continuation US20100312237A1 (en) 1998-08-05 2010-08-18 Electrosurgical device for restricting loss of blood during surgery

Publications (1)

Publication Number Publication Date
US20050143795A1 true US20050143795A1 (en) 2005-06-30

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Application Number Title Priority Date Filing Date
US09/762,285 Expired - Lifetime US6628990B1 (en) 1998-08-05 1999-08-04 Applicator for microwave radiation treatment
US10/625,232 Abandoned US20060047274A1 (en) 1998-08-05 2003-07-22 Applicator for microwave radiation treatment
US11/055,858 Abandoned US20050143795A1 (en) 1998-08-05 2005-02-11 Applicator for microwave radiation treatment
US12/858,519 Abandoned US20100312237A1 (en) 1998-08-05 2010-08-18 Electrosurgical device for restricting loss of blood during surgery
US12/882,612 Abandoned US20110004206A1 (en) 1998-08-05 2010-09-15 Method of using electrosurgical device for restricting loss of blood during surgery
US13/849,848 Expired - Fee Related US8753342B2 (en) 1998-08-05 2013-03-25 Method of using electrosurgical device for restricting loss of blood during surgery

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US09/762,285 Expired - Lifetime US6628990B1 (en) 1998-08-05 1999-08-04 Applicator for microwave radiation treatment
US10/625,232 Abandoned US20060047274A1 (en) 1998-08-05 2003-07-22 Applicator for microwave radiation treatment

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Application Number Title Priority Date Filing Date
US12/858,519 Abandoned US20100312237A1 (en) 1998-08-05 2010-08-18 Electrosurgical device for restricting loss of blood during surgery
US12/882,612 Abandoned US20110004206A1 (en) 1998-08-05 2010-09-15 Method of using electrosurgical device for restricting loss of blood during surgery
US13/849,848 Expired - Fee Related US8753342B2 (en) 1998-08-05 2013-03-25 Method of using electrosurgical device for restricting loss of blood during surgery

Country Status (8)

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US (6) US6628990B1 (en)
EP (2) EP1504791A1 (en)
JP (1) JP4180242B2 (en)
AT (1) ATE279235T1 (en)
CA (1) CA2339496A1 (en)
DE (1) DE69921143T2 (en)
GB (1) GB9817078D0 (en)
WO (1) WO2000007666A1 (en)

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US20110004206A1 (en) 2011-01-06
US20100312237A1 (en) 2010-12-09
WO2000007666A1 (en) 2000-02-17
EP1100585A1 (en) 2001-05-23
ATE279235T1 (en) 2004-10-15
GB9817078D0 (en) 1998-10-07
JP4180242B2 (en) 2008-11-12
JP2002522126A (en) 2002-07-23
US20130218155A1 (en) 2013-08-22
CA2339496A1 (en) 2000-02-17
US8753342B2 (en) 2014-06-17
DE69921143D1 (en) 2004-11-18
DE69921143T2 (en) 2005-03-17
US6628990B1 (en) 2003-09-30
US20060047274A1 (en) 2006-03-02
EP1100585B1 (en) 2004-10-13

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