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Sept. '17, 1946.
4 Sheets-Sheet 1
Filed llay 16, 1941
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Sept. 17, 1946.
Filed May 16, 1941
4 Sheets-Sheet 2
By a.c.sour/-/w0/?m
SePt- 17,;1946-
wm: GUIDE ELEc'rRoTnERAPEu'rIc sYs'rEu
Filed lay 16, '1941
4 Sheets-Sheet s
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Sept. 17, 1946.
Filed May 16, 1941
4 Sheets-Sheet 4
FIG. [0
Patented Sept. 17, 1946
George C. Southworth, Red Bank, N. J., assignor
to Bell Telephone Laboratories, Incorporated,
New York, N. Y., a corporation of New York
Application May 16, 1941, Serial No. 393,756
14 Claims. (Cl. res-422)
This invention relates to apparatus for electro
therapeutic treatment and more particularly to
such apparatus involving electric waves of ex
tremely high frequencies.
Electric energy having wave-lengths of several
meters has for some time been used for'deep pen
etration in what is generally known as diathermy.
Very much higher frequency waves are also suit
able for this purpose and there are indications
that they may produce still other biological ef
fects. It has been claimed that in particular fre
quency ranges these waves may kill certain
harmful bacteria and that in others they may be
used to destroy malignant tissue.
In the past it has been customary to apply elec
tric wave power to affected tissues by placing the
affected portion in so far as possible between two
plate electrodes. For example, if a rheumatic
knee were involved the two plates were placed
on opposite sides of the joint. In the case of
lumbago one plate was placed on the muscle in
volved and the other on the abdomen. With cer
tain gland difficulties one plate has taken the
form of a small ?attened rod that was brought
as near as possible to the affected part. The
other plate retained its usual form and was ap-
plied at some nearby external point.
It is obvious that in cases such as have been
mentioned, a large part of the wave power has
gone to parts that are unaffected by the disease.
An object of this invention is to increase the e?l
ciency of electrotherapeutic treatments by re
stricting the application of energy to that part
transmission properties as to transfer wave en
ergy with high ef?ciency to the a?ected part
which is to be treated.
All these objects and other features and ad
vantages of the invention will become apparent
upon consideration of the following detailed
speci?cation taken in connection with the accom
panying drawings in which:
Fig. 1 illustrates a high frequency electrothera
peutic system;
Figs. 2 to 9, inclusive, show modi?cations of
the applicator;
Figs. 10 and 11 illustrate details of an applica
tor for sterilizing ?uids; and
Fig. 12 shows a cabinet in which a therapeutic
system in accordance with this invention may be
Referring to Fig. 1, a source of high frequency
oscillations 10 may be of any suitable type as, for
example, a magnetron oscillator. Preferably it
is of a type capable of producing oscillations rich
in very high frequency harmonics. The oscillator
is placed within a closed resonance chamber H
so as to electrically excite the chamber at its res
onance frequency. In order to tune the chamber
II, a sliding tuner l2 and a telescoping cap I!
are employed. This enables ?xing the position
of the connections of oscillator ill with respect
to the chamber so as to secure the most effective
The oscillator accordingly produces
oscillations of a fundamental frequency deter
mined by the tuning of the chamber l I, and har
monic oscillations. Opening into the chamber H
is a wave guide IS the diameter of which is not
of the body which is in need of treatment.
Another object of the invention is to increase 35 large enough to permit oscillations of the funda
mental frequency to pass. Under those circum
the efficiency of transfer of energy from the
stances oscillations of the lowest harmonic fre
electric wave system to the body to be treated.
quency which the wave guide I‘ will pass are ac
An additional object of the invention is to in
centuated and transmitted by the wave guide to
crease the safety of electrotherapeutic treatment
by con?ning the energy applied to the region of 40 resonant terminal chamber l5 tuned by an iris l6
and a piston tuner I‘! to the desired harmonic.
the disease thus removing any hazards of derang
‘ The chamber I5 is connected to the input of an
ing other portions of the body which are in nor
electronic ampli?er IS. The output of the am
mal condition.
plifler is associated with a resonant terminal
An additional feature of the invention is the
provision of applicators sufllciently small to en 45 chamber IQ of a second wave guide section 20
with which is associated a power measuring ap
ter ori?ces or incisions which are not large.
paratus 2|, an impedance matching section 22
A still further object of the invention is to pre
and an adjustable applicator 23.
vent wasteful dissipation of wave energy by re
The ampli?er l8 comprises an evacuated en
?ection at the surface of a body to be treated.
Another object of the invention is to enable di 50 velope 24 preferably of dielectric material in
cluding an electron emitting cathode 25 of any
rective application of wave energy internally of
suitable type but preferably one which will emit
a body so as to treat a particular portion without
electrons in a well-defined central beam. An
exposing unaffected portions to unnecessary ex
electron collector or anode 26 is located at the
In accordance with the invention the energy of 55 opposite end of the envelope 2|. The external
circuits for exciting the cathode 25 and for po
such high frequency electric waves as lend them
larizing the collector 28 with respect to the cath
selves to wave guide transmission is directed to a
ode may be of conventional type and are not il
part in need of electrotherapeutic treatment by a
lustrated. Electron beam focusing device 21 for
wave guide which is terminated in an applicator
having such physical con?guration as is suitable 60 assisting in collimating the beam may be of well
known type. Circular discs 28 and 29 extend
for the part to be treated and having such wave
through and across the envelope 24 as extensions
of the upper and lower surfaces of the resonance
chambers i5 and I9. It will be understood that
the resonance chambers l5 and I! may be of any
suitable contour in their cross section perpen
dicular to the paper but, as illustrated, the
chambers are rectangular parallelepipeds. Discs
28 and 29 are each provided with conical projec
4 .
_ current in the pick-up antenna, the dial of the
indicator 45 may be readily calibrated as to show
the magnitude of wave energy passing the pro
Jecting antenna tip 42. In use, chamber 24 of
the wave power measuring apparatus is moved
along the wave guide 20 and the indications of
the indicator 45-are carefully observed. If these
vary with the position of the chamber from a
tions extending toward each' other and centrally
maximum in one position to a minimum in an
apertured as at 30 to form short central gaps 10 other, it is an indication that standing waves are
through the respective electromagnetic ?elds of
being set up in the guide 20 by re?ections occa
the chambers l8 and I! in line with the central
sioned by lack of an impedance match at some
axis of the electron beam passing from cathode
point. Accordingly, steps may be taken to read
25 to collector 26. In a manner which will be
Just the various couplings and, particularly, that
well understood to those skilled in the art. the 15 of the absorbing load 50 as to produce an im
electromagnetic ?eld within the chamber II will
pedance match and reduce such re?ections.
set up alternating potentials across the gap be
‘ When ?nal indication .of the indicator 45 is found
tween discs 28 to vary the velocity of the electrons
\to be constant as the chamber is moved along the
passing therebetween. The electron beam after
wave guide, it is evident that an impedance match
variation of its electron velocity passes down 20 has been attained. If, however, it should not be
through a drift tube II of length sumcient to en
possible to secure a fully satisfactory impedance
able the velocity-varied electron beam to become
match the indicator may be moved to and left
charge-density varied at the time that it reaches
at the position of minimum indication which will'
the gap between discs 29. If desired, the central
represent the power passing from the source to
dielectric portion of the envelope 24 between the 25 the applicator or load and not 1 returning.
inner discs 28 and 29 may be omitted and re
placed by the metallic drift tube. In a manner
also well known to those skilled in the- art, the
charge-density varied beam traversing the gap
Thereafter the dosage or the amount of energy
supplied to the load may be varied by varying the
output of the oscillator l0 and the indicator will
yield a corresponding indication.
between the discs 29 reacts with the electromag 30 Beyond the power measuring apparatus the
netic ?eld in the chamber It to transfer energy
impedance coupler section 22 serves to connect
from the beam to the ?eld. In this manner, the
the guide 20 to the applicator 23. The applica
harmonic oscillations selected by the wave guide
tor is designed to apply the guided wave energy
l4 and the resonance chamber i5 actuate the am-v
to a body to be given electrotherapeutic treat
pli?er II to impress upon the resonance chamber 35 ment. The applicator comprises a core 49 of di
l9 oscillations of corresponding frequency and
electric material to enable its dimensions in a
wave form but of greatly augmented intensity.
These ampli?ed oscillations are supplied by the
resonance chamber It to the wave guide 20. The
thickness direction to be made as small as pos
sible consistently with the wave-length used.
Assume, for example, that the core 49 consists of
resonance chamber I2 is provided with a coupling 40 ceramic material coated with sprayed metal or
iris 22 and a, tuner 22 similar to those 01' the
deposited metal as indicated at 50. A portion 5|
resonance chamber II.
of the core is left uncoated and is normally cov
The power measuring apparatus 2| is similar to
ered by a rotatable metallic sheath 52 to which
the structure illustrated in Fig. 5 of the U. 8.
a manipulating handle 52 is ?xed. The sheath
Patent 2,106,713 issued February 1, 1938 to A. E. 45 i2 is provided at its inner end with a bearing
Bowen. It comprises a tubular chamber 24
portion supported on an annular bearing ?ange
mounted to slide longitudinally along a slot 35
54 on the outer surface of the wave guide struc
in the wave guide 20 and provided with a shield
ture. Upon bringing the applicator into an inci
ing cover 26 to overlie the entire slot regardless
sion the sheath 52 is rotated to expose a?ected
of the position of the chamber 24. Supported 50 tissues to wave energy radiated through the un
along the central axis of the chamber 24 is a con
coated portion SI of the core. In this way the
ductor 31 including in series a wave detector 28
treatment may be con?ned to a particular zone or
preferably of the crystal detector type. Conduc
spot thus conserving the energy and preventing
tor 21 passes through the central portion of a sup- '
deleterious action upon unailected parts.
porting disc 29 of dielectric material and also 55
The impedance coupler section 22 is designed
through a central axial hole which it closely ?ts
to match the impedance of the guide 20 and the
extending through tuner 40 and its adjusting
applicator 23. The core 49, at its inner end is
screw 4|. A free end 42 of the conductor 31 pro
conical and dimensioned so that the solid dielec
iects down into thewave guide 20 and serves in
tric material increases its thickness as the diam
the manner of a small pick-up antenna to receive 00 eter or the impedance matching section 22 of the
energy from the electromagnetic wave propa
hollow wave guide 20 decreases.
gated through the wave guide. The tuning of
Fig. 2 illustrates a modi?ed impedance match
the antenna comprising that portion of the con
ing coupler and applicator which may be sub
ductor 3'! beneath the tuner 40 is effected by
stituted for the elements at the right of section
manipulation of an internally threaded nut 43 65 line 2-2 of Fig. 1. The impedance matching
retained in position by a lug 44 and engaging with
coupler 55 of Fig. 2 is a tunable resonance cham
the threads of the adjusting screw 4| which is
ber provided with two slide tuners 58 and 51.
attached to the‘ tuning plunger 40. The de
These enable the chamber 55 to be given the
tector 28 is electrically connected to an indicator ‘
proper tuning and at the same time enable the
45 through the conductors 21 and 4|, the con 70 position of the applicator dielectric plate 58 to
ductor 40 passing through an insulating eyelet
be properly fixed with respect to the chamber in
in the wall of chamber 24. A high frequency
order to secure the desired coupling between it
choke 41 may be included in the conductor 40.
and the chamber.
If the crystal response is proportional to the
Another problem involved is that of the design
square of the amplitude or the high frequency 76 of the applicator relative to the impedance of
thetissuesorbodytobetreated. 'I'heapplica
posited metal. For semi?exible material the cov
tlon oi the open end of a wave guide to an a?ected
part is a very simple expedient which is prefer
able to the present-day electrostatic plate
ering may be metal fabric such as is commonly
used for shielding conductors in high frequency.
method. when using the terminal or a wave
guide as an applicator the greatest amount 0!
power is transferred to the tissue when the im
pedance of the tissue matches that of the guide.
The applicator oi' Fig. 4 consists of a ceramic
core I! covered by a retractible metallic sheath
ll. when the apparatus is not in use the sheath
extends over the core su?iciently far that no
that is, when there are no serious re?ections at
waves are transmitted. It is held in its normal
the Junction oi’ the guide with the ?esh. Tissues 10 position by a spiral spring 65. By means of the
grips ii the sheath may be retracted as indicated .
consist mainly of water and hence may be
in Fig. 4, to a point where wave power begins to
thought of as high dielectric constant materials.
It is probable that they have considerable dielec?ow and the meter connected to the movable de
trlc loss. This indicates that in general for a , tector indicates the required output. In general,
proper match a guide of high dielectric constant, 15 it will be found that the sheath pomtions to give
preferably K=80 or more, should be used. The
appreciable amounts of power output occur at
use of such a material also tends toward a smaller
half wave intervals and that one or possibly two
and more convenient guide. Inasmuch, however,
of these exposed intervals will be su?icient, This
as tissues vary somewhat in their Water content.
distance will, 0! course. depend upon the ire
they di?'er also in dielectric constant. It is. 20 quencies used but for a loicentimeter wave it
therefore.- desirable to provide a system in which
will be found to be but a fraction of an inch.
the apparatus is fairly ?exible in its applicationIn a modification the sheath may be interior
Fig. 3 illustrate! an expedient for inhibitln!
re?ection from tissues. A wave guide 89 may be
ly threaded at its inner end to be retracted by
o! the hollow open-ended type is provided near 25
This form of applicator is adaptable to the
its end with an iris ‘I whichmay be moved longitreatment of semiexposed glands such as tonsils,
tudinally toward 01' away from the open end 01'
or if it be made su?iciently small and ?exible it
the guide. Thus the end section or the guide
may actually be passed through small ducts to
constitutes in e?ect a resonant chamber termia?ected parts as, for example, through nasal pas
‘nated by the tissue to which the open end is ap- 30 sages to sinuses.
plied. The iris may be moved until the Dowel‘
Fig. 5 illustrates an applicator similar to that
indicating device indicates that there 18110 1151160‘
of Fig. l but with the sheath made up with a
tlon oi’ the wave energy- If, however, the Part
hinged section 61 operated by a small rod 68.
t to which the energy is applied 18 not thick there
Fig. 6 shows how the open end of a wave guide
may be a beam of Wave energy Passing through 35 may be modi?ed to facilitate application of wave
the body under treatment with re?ections at the
outgoing surface 01' the tissue- To Prevent thi!
energy to the back. The design is intended to
promote comfort by allowing the patient to lie in
a short section ii of wave guide similar to that
his numa] dorsal position The applicator 15 a,
or guide 59 may be placed behind the port under
separate unit is to which the waveguide leading
treatment in alignment with guide 5! and its 40 to the power supply is connectedplt is intended
tuning piston 62 may be adjusted until no re?ecto he slipped into a bed under the. patient. Es
“011 takes Plan? at the back 0'1‘ “3801118 time,
sentially it is a hollow chamber perhaps 15 inches
across and 2 inches deep with all sides except the
F1!- 4 illustrates ‘"1 applicaml' mm?what 511m‘
top screened with metal. The top side may be
181' t° that of FIE 1 1°!‘ treating internal parts °f 4-5 covered with any one of several interchangeable
the body. To make the dimensions oi‘ the appllsheets ‘Ill of electrically conducting material, each
cat" as small as Wssible the Spa-0° “thin the
guide may be
a medium of
dielectrlc constant such as 8- ceramic loaded with tita-
having a hole ‘ll of di?erent proportions from
the others’
wave energy my pass
from the chamber to the body_ In practical use
nium dioxide as, for example, the compositionsw the operator selects the cover sheet having an
sold under the names of “Al Si Mag 190'" and
“Condensa." This material has a dielectric con-
of dimensions a
to ?at for the area
a’ebe'lfeatei The metalippa?s a; made semi.
slant ranging from 8° to 100 and consequently
?exible and are coated with rubber. Since the
permits use Of guides that range from one-ninth
chamber may be greatly distorted by the weight
t° ‘me-tenth the diameter of all‘ C?" guides hav- 55 of the patient an iris n is provided for tuning
mg a similar frequency “31151111551” range- Fm‘
and is made adjustable in both position and in
example, ceramic guides suitable for lo-cen?'
diameter. Adjustable diameter irises are so well
meter waves (i=3000 megacycles) need be but a
i th
quarter 01' an inch in diameter. Stated another
way, a guide of this kind 1 inch in diameter may 60 .
mg; :0 dzgned dzgcdrlguzimp c m as to
pm 7 is an example of how the o
n end of a
be used for applying waves as long as 40 centi-
wave guide may be modi?ed to makeg: more com
meters “=75” megacycles) Ceramic materials are, in general, in?exible
and 1°’ this “as” may be unsuitable ‘9r awn‘ ’
cators for certain purposes. When ?exibility is
necessary it may be had by breaking the rod ma“
venient to
treat a knee'joint. A large part of the
applicator 13 is made of solid metaL This pm_
vides a chamber of more or less ?xed dimensions
and also a suitable connection " to the pipe "
leading to the wave energy source. Outside of the
‘em-1 in” be“! °f suitable length and stringing
them on an manning °°rd~ The over'a'u pet‘
rormance will be better if one end °! each bead ‘5
solid portion or the applicator 13 there is another
semi?exible part 16 made of metal fabric. The
latter provides a better lit to the irregularities oi’
end is 7 the knee. The entire apparatus
may be coated
cav orcup
fashion. Flexibility may also 138%
with rubber both for convenience of application
the guide 0! rubber and loading it with titanium
dioxide. Metallic coverings for these ceramic
guides may be metal pipes, sprayed metal or de
tight barrier 11 consisting of a tightly ?tting but
electromagnetically transparent disc may be
placed over the end of the input pipe. With a
and also for appearance and comfort. An air-,
connecting pipe 18 leading to an exhaust pump
the air may be partly removed thus causing the
?exible portion 16 to cling tightly to the ?esh.
. electric wave energy for sterilization and pas
teurization oi.’ ?uids. Wave guide apparatus of
the general type disclosed offers numerous advan
. In Fig. 8, there is shown an applicator compris
tages over ordinary electric apparatus and cir
ing a wave guide 88 terminating in a ?at cham =1 cuits in these processes. If the ?uid be a gas with
ber 8| of circular conformation as viewed from
substantially the same dielectric constant as air
above. To afford a convenient grip a thumb-hold
it will be su?lcient to circulate the gas through a
82 integral with the casing of chamber 8| is pro
resonant chamber in which radiation of willvided. The chamber 8| carries an applicator 83
clent intensity prevails. If, however, .the ?uid to
resembling the usual hypodermic needle em 10 be treated be a liquid the design must take into
ployed by physicians. This comprises a very
account the dielectric constant and the losses pre
small hollow metallic pipe 84 sharpened at its
sented by the substance to be treated. For pur
lower end as at 85 and the interior of which is
poses of illustration we shall assume that the ma
?lled with a needle 86 of dielectric material such
terlal to be treated is water and that its dielectric
as titanium dioxide. The needle 86 may have an 15 constant is 8|. An apparatus suitable for such a
treatment is shown-in Figs. 10 and 11.
hollow pipe 84 of the applicator 83 is mounted to
Referring to Figs. 10 and 11 a resonant metal
slide longitudinally within a cylindrical member
\lic chamber 88 similar in general to the resonant
81. It is maintained in its normal position by
chamber II of Fig. l is shown open at its left end
an internal compression spring 88 of a well 20 for connection to a wave guide. A sliding tuning
known type which is retained between abutments
device I88 is provided for reasons which will be
on the mov ble pipe 84 and the cylindrical por
apparent. The chamber 99 is divided into two
tion 8'! of t e applicator. A cap 88 threaded into
parts by means of two rather closely spaced metal
the wall of chamber 8| carries the needle 88 and
partitions IN and I82. Between the partitions
may be unscrewed from its position to remove the
IM and I82 a sterilization cell I83 shown in detail
in Fig. 11 passes transversely through the cham
needle 86 when desired. When the device is to be
used the tip of the applicator 88 is placed in
ber 88. It comprises a rectangular ?uid conduit
contact with the ?esh of the patient in the re
having an inlet I84 for liquid to be sterilized and
an outlet I88. Openings in the partitions IN and
gion of the affected part, the operator grips the
thumb-hold 82 and the ?nger-holds 88 and 30 I82 of an area roughly one-ninth that of the area'
of each partition expose the liquid to electromag
presses the chamber 8| downward thus forcing
netic wave energy which readily passes through
the applicator through the ?esh to the affected
part. The finger-holds are attached to the slid
windows I86 of low loss dielectric material which.
correspond to and are contiguous with the open
ing pipe of the applicator by pins 8| passing
ing. To prevent escape of wave energy beyond
through slots in the stationary cylindrical mem
that portion of the sterilizing cell between the
ber 81. The pins 9| also serve to hold the shell
> internal diameter as small as 8.1 millimeter. The
84 from being forced outwardly by the spring
88 beyond a desired limiting position. After ‘the
tip of the applicator 83 has been forced to the
position of the tissue to be treated the ?nger
holds 88 are squeezed toward the thumb-hold 82
thus retracting the pipe 84 toward the chamber
8| and exposing the tip of the dielectric core 88
to permit high frequency guided wave energy to
be readily transmitted to the affected tissue.
Fig. 9 shows a modi?cation of the disclosure of
Fig. 8 in which the cap 89 and the needle 88 car
ried thereby have been removed and replaced by
a funnel 82 provided with threads to screw into
the wall of the shell 8|. The funnel carries a
glass tube 93 extending well down past the spring
88 and ?tting closely within the pipe or shell
portion 84 of the applicator. The funnel may be
?lled with an aqueous solution of high dielectric
constant to constitute a guide from the chamber
8| to the tip of applicator 83. A metallic screen
84 across the lower part of the funnel permits ?ll
ing the funnel 82 and the pipe 84 and at the same
time precludes loss of electric wave energy from
the chamber through the funnel. It will be un
derstood that the internal diameter of the pipe 84
windows, and screens I81 and top and bottom me
tallic walls I88 are provided to permit ?ow of the
?uid to be sterilized.
This construction insures
40 that there be a su?icient intensity of the wave en
ergy between the windows I86 to kill germ life.
The proper position of the dividing partitions IN
and I82 along the length of the chamber may be
determined experimentally. The plunger I88 may
assist in obtaining the most effective position for
the sterilization cell relative to the length of the
Fig. 12 illustrates a portable cabinet assembly
of a typical electrotherapeutic system in accord
The three meters I88
50 ance with the invention.
indicate respectively plate voltage, plate current
and ?lament current of the oscillator or the am
pli?er, as desired. For the circuits of each of
these currents, there is a corresponding regulat
55 ing knob II8. A meter 45 serving as a power in
dicator, as already explained in connection with
Fig. l is also provided. Switches III respectively
close the ?lament and plate current circuits. An
indicator II2 similar in appearance to the fre
60 quency tuning indicator of an ordinary broadcast
receiver is connected by a ?exible wire through
the rotatable control knob II3 to the movable
is suihciently small to retain the dielectric ?uid
chamber 34 of Fig. 1 carrying the detector 38.
by capillary action. Upon insertion of the appli
This facilitates moving the power measuring ap
cator in the tissue to be treated ‘energy may be
applied from chamber 8| over the guiding path 65 paratus along the length of the wave guide.
The cabinet may be provided with an output
constituted by the pipe 84 with its liquid dielectric
wave guide section made up of a continuous spi
?lling. As in the case of the device of Fig. 8 the
ral of interlocking metal strip so arranged as to
pipe may be retracted to facilitate the energy
provide a moderate amount of ?exibility. It is
transmission transfer between the guide and the >
tissue to be treated. In e?’ect the pipe 84 is not 70 permissible to employ 20 feet or more of this tub
retracted from the tissue but chamber 8| is
ing if desired, since moderate bends do not mate
brought closer to the tissue forcing the dielectric
rially affect the transmission. Inasmuch as the
liquid within the shell 84 into most intimate con
cabinet is mounted on wheels and the output
tact with the tissue.
guide is ?exible the apparatus may be convenient
Sometimes it is desired to utilize high frequency 78 ly employed in almost any location. The basic
wave energy, a tubular dielectric guide connected
to said source for-brlnzlns wave energy to the
surface of a body upon which the energy is to be
impressed and means connected to the guide for
inhibiting energy re?ections at the surface of
the body, said means including a controllable iris
within the wave guide by which the impedances
power supply may be provided by means of a plug
and cord of conventional type cooperating with a
socket Ill in the cabinet and the customary rec
ti?er ?lter may be mounted in the cabinet or the
cabinet may contain batteries to energize the ap'
What is claimed is:.
1. A wave guide system for electrotherapeutic
of the surface of the body nearest‘ the guide
treatment by high frequency waves comprising a
and that or the guide maybe matched.
8. A system comprising a source of electric
tubular member having an electrically conduct
.ing surface to con?ne high frequency energy
wave energy, a dielectric guide connected to said
guided thereby. the diameter of the member be
source for bringing wave energy to the surface
of a body upon which the energy is to be im
ing or the order of one-fourth inch, whereby the
pressed and means connected to the guide for in
member may be inserted in small ori?ces or inci
sions and a ?lling within the tubular member 15 hibiting energy re?ections at the surface of the
body, said means including a tunable re?ector
of a ?nely divided substance having a high di
which may be placed beyond the body as viewed
electric constant to increase the wave-length
from the transmitting system whereby energy re
which the tubular wave guide is capable of
- -.
?ections at the remote surface of the body
2. A system for transfer of electric oscillation 20 be prevented.
9. A system comprising a source of electric
energy comprising a source of electrical oscilla
wave energy, a dielectric guide connected to said
tions, 9. wave guide having an input portion con
source for bringing wave energy from the source
nected to the source, an energy transfer element
to the surface of a body upon which the energy
connected to another portion of the guide, the‘
transfer element having a terminating dielectric 25 is to be impressed, and means connected to the
guide for inhibiting energy re?ections at the sur
core which may be projected within a zone to
face of the body, said means comprising a device
which oscillation energy is to be transferred. a
on each side of the body under treatment where
slidable electrically conducting sheath thereover
by one device inhibits re?ections or wave energy
to substantially enclose the core, and means
whereby the sheath may be slid longitudinally to 80 as it enters the body on the one side and the
other inhibits re?ections of wave energy as it
leaves the body on the other side.
expose more or less or the core to control the
‘amount of energy transferred from the dielectric
‘to the surrounding zone.
10. An electrotherapeutic appliance compris
ing a tubular needle of electrically conducting
' 3. A sterilization system comprising a ?uid
conduit, electric wave energy screens permeable 85 material adapted to be forced into the ?esh in the
region of an aifected part and means for supply
ing electric wave energy to the tubular needle at
one .end whereby the energy may be guided by
to the ?uid placed transverse to the direction of
?uid flow, the conduit between said screens com
prising two opposing wails of dielectric material
the dielectric within the needle serving as a di- ‘
to permit passage of electric wave energy trans
' versely through the ?uid in the zone between the‘ 40 electric guide and applied at an'interior point in
screens, and the remainder of the conduit be
tween the screens comprising electrically con
ducting material whereby the screens and the
surfaces surrounding the zone ‘between the
, the ?esh at which the a?ected part is locatedf
" screens may serve as a section of an electric wave 45
4. A wave guide for directing electric wave en
ergy to mass to which the energy is to be ap
11. An electrotherapeutic appliance in accord
ance with claim 10, characterized in this that
the tubular needle is provided with a dielectric
12. An electrotherapeutic appliance in accord
ance with claim 10, characterized in this that
the tubular needle is provided with a solid dielec
tric core.
plied, an applicator for terminating the wave
18. An electrotherapeutic appliance in accord-.
guide and for transferring’energy to the mass 50
ance with claim 10, characterized in this that
comprising a core of dielectric material having
the tubular needle is provided with a dielectric
a portion of its periphery coated with conducting
core comprising ?uid material.
substance to prevent escape of energy, a movable
14. A system for application of electric wave
conducting sheath normally‘ covering the un
coated portion of the applicator, and means for 55 energy to a mass comprising a source of electrical
oscillation of the order of a few centimeters wave
moving the sheath to expose a desired part of the
length, a tubular wave guide by which the energy
uncoated portion to permit out?ow of energy
of the electrical oscillations is directed to the
5. An appliance comprising a wave energy di- ' mass, the source and the wave guide having an
recting system for bringing wave energy to a 60 electrically conducting sheath wholly surround
ing the source and the wave guide except at the
body to which it is to be applied, a wave energy
terminal of the wave guide remote from the
applicator connected to and serving to terminate
source to prevent unwanted escape of energy, an
the directing system and consisting of a hollow
opening in the wave guide near said remote ter-‘
conducting member having a contour adapted to
thereof, a movable conducting closure for
?t the surface of the body, and means for ex 85 minal
the opening, the portion of the guide in the
hausting the atmosphere from within the appli
region of the opening having a core of dielectric
cator to cause it to hold tightly against the body
whereby the cross sectional dimension
whereby unwanted leakage of wave energy be
of the guide and the area of the opening may
tween the applicator and the body is prevented.
6. An appliance in accordance with claim 5, 70 be considerably reduced, and means for con
trolling the position or the closure to regulate
characterized in this that the periphery of the
applicator ?ts against the body and is ?exible to
accommodate itself to varying conformations.
7. A system comprising a source of electric
emanation of wave energy through the opening
to the mess.
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