U.S. patent number 3,858,586 [Application Number 05/366,011] was granted by the patent office on 1975-01-07 for surgical method and electrode therefor.
Invention is credited to Martin Lessen.
United States Patent |
3,858,586 |
Lessen |
January 7, 1975 |
SURGICAL METHOD AND ELECTRODE THEREFOR
Abstract
A surgical electrode is described. This instrument is adapted to
fit into a body cavity, to be directed by the surgeon to an
operative area in the cavity and then to emit a cauterizing
electric current. Several embodiments are disclosed. In one, a
blind electrode is positioned and pulsed. In another, an electrode
is coupled with optics to permit directing it by sight or by CRT
display. In another, a forked or dual electrode is shaped to the
body cavity and can be properly positioned with excellent
reliability. Preferably, at least the portion of the instrument
inserted in the body cavity is disposable. The present invention
includes method and apparatus for female sterilization using the
electrode for cauterization of fallopian tubes.
Inventors: |
Lessen; Martin (Rochester,
NY) |
Family
ID: |
26821329 |
Appl.
No.: |
05/366,011 |
Filed: |
June 1, 1973 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
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123194 |
Mar 11, 1971 |
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Current U.S.
Class: |
606/49; 128/831;
600/104 |
Current CPC
Class: |
A61B
17/42 (20130101); A61B 18/1485 (20130101); A61M
3/0279 (20130101); A61B 2217/007 (20130101); A61B
18/1402 (20130101); A61B 2018/1226 (20130101); A61B
2017/4233 (20130101) |
Current International
Class: |
A61B
18/14 (20060101); A61B 17/42 (20060101); A61M
3/00 (20060101); A61M 3/02 (20060101); A61b
017/36 () |
Field of
Search: |
;128/303.10,303.17,303.14,6,2R,4 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Medbery; Aldrich F.
Attorney, Agent or Firm: Steinhilper; Frank A. Rosen; Alfred
H.
Parent Case Text
CROSS-REFERENCE TO CO-PENDING APPLICATION
This present application is a continuation-in-part of co-pending
U.S. Pat. Application Ser. No. 123,194 filed Mar. 11, 1971 and now
abandoned.
Claims
I claim:
1. A method of sterilization of a female human being, comprising
guiding a source of electric discharge under direct vision to the
fallopian tubes of said female, generating a cauterizing electric
discharge essentially completely, within the fallopian tubes
removed from the uterus proper and allowing interior scar tissue to
form, thus sealing said tubes.
2. A method of sterilization of a female human being, comprising
inserting a fine electrode tip from the uterus into each fallopian
tube in a manner to locate said active electrode tip within said
tube essentially at the narrowest portion of said tube, and
generating a cauterizing electric discharge from said electrode tip
to cauterize the tissue within said tube, and allowing scar tissue
to form.
3. A method of sterilization of a female animal comprising guiding
a source of electric discharge under direct vision to the fallopian
tubes of said female, generating a cauterizing electric discharge
essentially completely within the fallopian tubes, avoiding the
uterus wall with said discharge and sealing said tube by allowing
scar tissue to form.
4. A surgical instrument for female sterilization by sealing the
fallopian tubes, means for providing a cauterizing electric
generated discharge wholly within the fallopian tube to cause
tissue wall scarring and permanent blocking of said fallopian tubes
comprising an elongated electrode of a size to fit well within said
fallopian tubes, means for providing direct vision of the tip of
said electrode to guide said electrode to a precise position
adjacent the entrance of said tube, means to insert said tip into
said tube, and means to supply an electric discharge pulse to said
electrode tip, essentially completely within said tube.
5. A surgical instrument according to claim 4, wherein said means
to guide said electrode comprises a fiber optics bundle for optical
illumination and observation of the position of said electrode tip
and said electrode includes means for maneuvering said electrode
tip in response to said optical observation, said maneuvering being
from a position outside the body.
6. A surgical instrument according to claim 5, wherein said
instrument includes means to flush the optical tip and visual
field.
7. In a surgical instrument according to claim 5, including a
removable sheath completely surround said fiber optics device to
protect said fiber optics device from contamination and containing
a movable electrode and an optical tip positionable adjacent to the
fiber optics tip and means in said sheath for fluid flushing of
said optical tip and field of observation.
Description
BACKGROUND OF THE INVENTION
This invention relates to a new surgical instrument and to its use
and operation.
This is a continuation-in-part of application Ser. No. 123,194
wherein it was disclosed that a fine electrode member is placed
into a natural body cavity, the tip of the electrode positioned at
a constricted point of such cavity, and that the electrode tip then
is energized to cause a cauterizing spark. A consequence of the
cauterizing spark is the cleaning or sterilization of the
constriction or fine passageway. One specific consequence of such
spark well within a fine passage is that scar tissue forms, thus
sealing, healing or blocking the passageway. Thus, if the passage
is the consequence of an injury or other physical or physiological
defect, illness, infection or the like, the electrode can be a
healing mechanism. In one embodiment of the invention, a natural
passageway can be blocked by proper use of this electrode. In
particular, fallopian tubes can be blocked by use of this electrode
with the consequence that female sterilization can be brought
about. The present invention is directed to such female
sterilization.
At the present time, there is a great need for a quick, easy and
effective mechanism for female sterilization. This need is
abundantly clear in the United States and is perhaps even more
pressing in other countries, particularly, poverty striken
countries. Birth control and population reduction are easily and
non-surgically accomplished by a wide variety of means dependent on
continual cooperation by the people involved. Sterilization,
however, has generally been a serious surgical operation requiring
hospitalization and use of a surgical operating room. Obviously,
therefore, the need is clear for a sterilization procedure which
can be carried out for example, in the doctor's office. Even more
pressing is the need for some form of mass sterilization techniques
in which a doctor or a team of medical personnel can operate a
sterilization technique at temporary field quarters. The present
invention provides such a technique.
GENERAL NATURE OF THE INVENTION
The present invention comprises a surgical electrode adapted to be
operated for female sterilization by insertion of an electrode tip
well within the walls of the fallopian tubes. When properly
positioned, the electrode is energized, causing a spark which in
turn causes scar tissue, blocking the fallopian tube. A high
percentage of success can be achieved, and within a few days of the
operation, a clinical or medical test can be performed to determine
whether it was or was not successful. No hospital visit is required
and the operation can be carried out in a few minutes essentially
painlessly in the doctor's office. If desired, clinic or field
operations can be carried out to treat a large number of people
quickly, easily, painlessly and effectively.
Operations intended to block fine passages such as fallopian tubes
have been employed previously with a substantial lack of success,
at least for the purpose of human sterilization. The problem is
that side effects may result and also that sterilization is
uncertain. In particular, if blockage of the passage occurs
essentially at the mouth of the passage, then there is too large a
likelihood that the passage will not be effectively blocked and
that physiological disorders will result. Accordingly, in use of
the electrode according to the present invention, it is essential
that the tip of the electrode be sufficiently fine to fit well
within the passage being blocked and it is essential that it be so
positioned.
SPECIFIC DESCRIPTION OF THE INVENTION
The nature of the invention is more particularly set forth and
apparent from the drawings, in which:
FIG. 1 is a diagrammatic view of a surgical instrument according to
one embodiment of the invention;
FIG. 2 is an enlarged fragmentary view in cross-section of one form
of an electrode for the device of FIG. 1;
FIG. 3 is an enlarged fragmentary view in cross-section of another
form of an electrode for the device of FIG. 1;
FIG. 4 is a side view of an electrode according to another
embodiment of the invention;
FIG. 5 is a front view of the electrode of FIG. 4 in partly closed
position;
FIG. 6 is a front view of the electrode of FIG. 4 in open
position;
FIG. 7 is a diagrammatic view of an electrode according to another
embodiment of the invention;
FIG. 8 is a diagrammatic view of another form of an electrode;
FIG. 9 is a diagrammatic view of three electrode portions of an
electrode according to another electrode embodiment;
FIG. 10 is a view of a surgical electrode for sterilization
according to another embodiment of the invention;
FIG. 11 is a diagrammatic view of the operating end of the
electrode of FIG. 10;
FIG. 12 is the electrode of one embodiment of the invention
positioned to perform cautery inside a fallopian tube;
FIG. 13 is an enlargement in section of the end of the electrode of
FIG. 12;
FIG. 14 is an enlargement in section of the eyepiece end of the
electrode of FIG. 12;
FIG. 15 is a cross section view of the assembly of FIG. 13.
The surgical instrument according to this invention may be a
general purpose instrument, but preferably, it has shape and
configuration specifically adapting it to a single preferred type
of application. The presently preferred device is adapted to
sterilization of the female human being or female animal, as the
present invention now is believed to have as its most important
aspects a method and instrument for sterilization. In certain
instances, it is desired to have simply a surgical electrode which
can be manipulated to position its operative electrode tip at a
desired position within a body cavity, which position can be
readily determined by a practiced and experienced surgeon from a
position external to the body. In this situation, the experienced
surgeon need merely employ a single elongated electrode such as
that shown in FIGS. 1, 2 and 3 which he can, by practice, and
experience, manipulate to the desired position within the body
cavity. In many instances, the manipulation can be assisted
visually either by looking into the body cavity from an external
position or by optical means. In this way, for example, it is
possible to employ the surgical instrument for many forms of
corrective surgery where a relatively large body cavity is being
treated or where a passage is accessible directly from outside the
body. Certain cysts and infected channels can be treated in this
manner and it is observed that electrical cauterization not only
produces healing scar tissue, but also cleans or sterilizes the
passage being treated.
In many instances, however, it is necessary to treat a fine passage
positioned well within a cavity in the human body at a position
which cannot be readily located with accuracy from outside the
body. In such instances, it may be desirable to employ the
electrode combination illustrated in FIG. 7. In this figure is
illustrated a surgical instrument including a flexible maneuverable
electrode having an operable electrode tip and including flexible
optical means such as the fiber optics member illustrated in the
figure. The surgeon employing such an instrument can direct it to a
precise position within the body cavity and can with confident
assurance, position the operable electrode tip at precisely the
right location for electric cauterization to produce the desired
scar tissue. The surgical electrode according to this embodiment of
the invention has universal application and can be employed in the
simplest of operations at or near the surface of the body and in
the most difficulty accessible positions within the most tortuous
body cavities. It is to be observed in particular that this
electrode can be employed deeply within nasal passages or within
the throat and even to the extent of being employed in the stomach
or abdominal passages. Although certain embodiments of surgical
electrodes according to this invention may be specifically designed
for common surgical procedures repeatedly employing essentially a
standard technique, it is still possible to employ this embodiment
of the invention including both operative electrode tip and optical
means in essentially any and all surgical procedures contemplated
by the present invention.
In FIGS. 4, 5 and 6, there is also shown a special purpose surgical
electrode which may be appropriately designed for an operation
requiring two (or more than two) electric cauterizations in a
standardized surgical operation which may be carried out time and
time again. Such an operation typically may be animal sterilization
in which a predetermined size and shape electrode including at
least two operative electrode tips is appropriately positioned to
trigger simultaneously two or more electric cauterization
discharges which will produce scar tissue appropriately sealing
fine body passages at uniformly predictable positions within a body
cavity. It is possible according to this embodiment of the
invention to produce simple, inexpensive surgical electrodes having
a plurality of operable electrode tips and to produce these
electrodes at a cost essentially the same as or perhaps even less
than the cost of sterilization after use. Accordingly, a new and
unused, and therefore sterilized, electrode may be employed on one
animal and immediately thrown away to permit the use of another
new, and therefore sterilized, electrode for at least those
portions of surgical apparatus which are employed within a body
cavity.
The use of the electric cauterization instrument and technique
according to the present invention has many obvious advantages. The
primary advantage is that a surgical result can be achieved at a
difficultly accessible or otherwise inaccessible portion of the
body without cutting or surgically opening body tissue. In this
way, it is possible to accomplish surgery without hospitalization
for operations which might otherwise require several or many days
recuperation in a hospital.
Certain specific embodiments of devices according to this invention
are illustrated in the drawings accompanying this description. It
is to be understood, of course, that various modifications will be
obvious to one skilled in the art.
FIG. 1 is a schematic representation in very simple form of an
electrode according to the concept of this invention. As
illustrated in FIG. 1, the device includes a handle 11 having an
elongated flexible electrode tip 12. The handle may for example,
have gripping means 13 to permit it to be conveniently held in the
hand of the surgeon. It may have an external electric cord 14
adapted to be plugged into a conventional electric outlet or it may
have self-contained electric circuitry suitable mounted within the
handle. The flexible electrode 12 may consist of a double electrode
wire as illustrated in other figures or there may be a ground lead
15 extending from the device and terminating in a ground plate or
clamp (not shown) adapted to be positioned against the skin of the
animal or patient as close as possible to the point of surgery.
Conventionally mounted on the handle 11 is an electric switch or
button which is adapted to be thrown or pressed to operate the
electric circuitry to produce a pulse at the tip of electrode 12
when desired. It is understood that the circuitry to produce the
pulse is completely conventional and may comprise any desired
electrical mechanism to produce a pulse or spark at a tip of the
electrode. A conventional high frequency or a capacitance circuit
may be triggered by switch or button 16 to produce such a pulse and
the circuit can be energized by an internal battery-operated
electric means or by electric means connectable to a conventional
and convenient power outlet.
In FIG. 2 is shown in enlarged partial cross-section one form of
electrode 12 of the device of FIG. 1. This flexible electrode
comprises an electrically conductive wire 21 terminating in a tip
22 and surrounded by a plastic sheath 23. Desirably, the wire 21 is
longitudinally moveable within the sheath and in such case, it is
also desired that the wire 21 have a thin coating of plastic or
other insulator along its length except the tip 22. In use and
operation, the flexible electrode 12 is inserted into the body
cavity until it is at the desired position. Electrode wire 21 is
then advanced in sheath 23, or sheath 23 is then retracted from the
tip to assure proper mechanical contact with the tissue to be
cauterized. When the tip is properly positioned, switch or button
16 is activated to create an electric pulse or electric spark at
tipp 22 of electrode 12.
In FIG. 3 is shown a modified and presently preferred embodiment of
flexible electrode 12. According to this embodiment, a pair of
insulated wires 31 and 32 terminate in tips 33 and 34 and are
encased in a plastic shield or sheath 35. The wires may or may not
be longitudinally movable in the sheath 35. The electrode according
to this embodiment of the invention is employed in the same way as
the electrode according to FIG. 2. It is inserted into the body
cavity properly positioned and then an electric pulse is generated
to produce a spark or similar pulse between electrode tip 33 and
electrode tip 34 that produces electric cauterization of the
tissue. The insulated conductors 31, 32 and tips 33, 34 may be
coaxial in geometry.
Size and shape of the flexible electrode 12 is material to the
function of the device, inasmuch as it relates significantly to
size and shape of a natural body cavity of a human or other animal.
A purpose to be achieved by the present invention is to permit easy
and simple operation within a body cavity of an animal or human
being and generally speaking, it is expected that such operations
will be carried out within a tightly confined cavity or at a
precisely positioned location within the cavity. Accordingly, the
electrode 12 generally will be long enough to reach into the body
cavity and to the right location therein and to extend completely
outside the cavity. For most purposes, the electrode will be
roughly six to twelve inches long. Also, obviously, longer or
shorter may be acceptable or necessary for certain purposes. In
addition, the electrode 12 generally will be quite thin and it will
be only unusual cases that the width or diameter of the electrode
will exceed 1/8 inch or at the most 1/4 inch. Obviously, thicker
electrodes can be used for certain purposes, but the convenience of
the present surgical instrument generally will not be realized
except with an extremely thin electrode which can reach positions
within a body cavity where conventional instruments cannot find
access. Likewise, electrode tips 33 and 34 (where a dual electrode
is used) should be positioned as close together as possible
consistent with producing a workable and effective electric spark
or electric pulse by the tips. Generally speaking, the electrode
tips will be spaced a small fraction of an inch apart to produce a
highly concentrated localized pulse or spark, thus permitting
accurate position and location of the electric cauterization.
Generally speaking, the electrode 12 will have a spring-like
resiliency permitting it to be positioned within a body cavity
without bending out of shape and without being so rigid as to harm
the tissue which it contacts. This result can be achieved with the
use of conventionally available spring steel electrode wires. The
wires together with an electrically insulating coating can be
appropriately thin and still have the desired degree of strength
and flexibility. Accordingly, it is to be realized that the
sections of electrode 12 illustrated in FIGS. 2 and 3 have been
distorted in shape and do not represent a reasonable depiction of
the preferred electrode length or preferred electrode
dimensions.
In FIGS. 4 and 5 and 6 are illustrated another embodiment of the
invention employing a forked electrode adapted to cauterize
locations within a body cavity. This form of the electrode is
presently preferred for an operation in which cauterization is
desired at two predictably spaced locations within a single body
cavity. One preferred purpose of the instrument is cauterization of
fallopian tubes and, accordingly, for this purpose, the preferred
instrument is that shown schematically in FIGS. 4, 5 and 6.
FIG. 4 illustrates the side view of a bifurcated electrode
generally designated 41. The electrode has a single body section 42
from which extend two divergent electrode 43 terminating at
electrode tips 44. The electrode illustrated in FIG. 4 tapers
slightly from the body 42 to the tip 44 and generally curves
gradually to conform with a typical body cavity. As seen in FIG. 5,
and FIG. 6, a sheath preferably a plastic sheath 46 retractably
covers the two electrode sections 43 and can extend close to or if
desired over electrode tips 44. The insulated conductors are
longitudinally movable within the electrodes 43 to advance the tips
44 to their desired position.
In operation, the device according to FIG. 4 is first closed and
protected with sheath 46 extending essentially to the electrode
tips. It is then inserted into the body cavity after which sheath
44 is withdrawn to permit electrodes 43 to spread apart to their
natural position. The device is then manipulated by the skilled
operator until electrode tips 44 are both at the desired position
and then the two electrodes 43 are simultaneously or sequentially
pulsed to produce a cauterizing electric pulse or spark at tips 44.
Generally, it will be preferred to have individual operating
electric circuits for each of electrodes 43 and to employ dual
wires in each as shown in FIG. 3. In this way, a first electrode 43
is energized to produce a cauterizing pulse and the pulse
preferably will be indicated by suitable dials, gauges or other
signals externally positioned. After the first pulse has been
produced at one electrode, a second pulse is produced at another
electrode and again is signaled appropriately externally.
The device of FIG. 1 in conjunction with the electrodes shown in
FIGS. 2 through 6 can be extremely inexpensively manufactured
particularly in moderate or large quantities. Accordingly, their
cost can be so low as to make it economically feasible for the
electrodes to be used once and thrown away. Disposable electrodes,
accordingly, are contemplated and it is to be expected that at
least that portion of the device which operates within the body
cavity may be disposable to permit a single use, although, of
course, the device may be sterilized and reused if so desired.
In FIG. 7 is illustrated another embodiment of the invention
including self-contained optical means to permit a skilled operator
or surgeon to position the operating tip of the electrode by sight
or by other visual means. As schematically illustrated in FIG. 7, a
flexible protective sheath 71 encases a plurality of electrode
wires 72 suitably insulated and positioned in generally the same
manner as shown in the other figures. Also positioned within the
sheath 71 is a fiber optics bundle 73 for viewing the position of
the electrode tips, optionally with a second fiber optics bundle
73A to carry light into the body cavity to illuminate the field of
vision. Optionally, bundle 73 can operate to carry light both ways
and to serve both the illumination and viewing purposes. Near the
end of the fiber optics bundle 73 is an optical imaging means such
as a maneuverable mirror 74 which may, for example, be rotatable
around pivot 75. A control mechanism such as a control wire 76 can
adjust the mirror 74. Optionally, an outer disposable sheath 78
permits a flow of water or other fluid to the end of the electrode
to flush out the field of vision.
Associated with the electrode of FIG. 7 can be extremely small
light sources or other devices to assist in viewing and positioning
the electrode tip. In use and operation, after the electrode of
FIG. 7 is properly positioned, sheath 71 may be partially retracted
to bring electrode 72 into the proper location and the electrode
may then be pulsed.
The surgical instrument according to the present invention can be
employed for any desired electrical cauterization operation within
the body cavity of a human being or other animal. The presently
preferred purpose, however, is in connection with female
sterilization for birth control where it is expected that a simple
and convenient operation can be performed in a few minutes without
the necessity for incision with other surgical instruments. It is
also expected that a careful, skilled operator can achieve a
successful result in excess of 95 percent of the occasions of use.
Furthermore, with a medical check after the operation to detect
incomplete success, it is expected that essentially 100 percent
effectiveness can result from a single or once-repeated operation.
It is also expected that the cost of such operation both in terms
of money and in terms of patient care can be reduced perhaps at
least to about 1 percent of the time and cost of conventional
operations.
In FIG. 8 is shown another form of electrode probe according to
this invention including an elongated electrode body 81 which may
be one of the electrodes of a previous figure such as the electrode
of FIG. 7. The electrode body 81 has electrode tips 82 at the point
thereof and means (not shown) for pulsing the tips. An outer sheath
83 retractably covers electrode body 81. At the end of the sheath
furthest from the tip is a ring or handle 84 forming a finger grip
to retract the sheath from the electrode tip and a cooperating base
or finger grip 85 on the electrode body forms convenient means
associated with the electrode to expose the electrode tips in
operative position for a cauterizing electric pulse.
in FIG. 9 is shown diagrammatically a portion of an electrode
adapted to be positioned within a disposable plastic sheath like,
for example, the electrode of FIG. 7, or adapted to be encased in a
plastic shield like, for example, the electrode structure of FIG.
3. In FIG. 9, a pair of electrodes 91 and 92 are positioned on each
side of a central electrode 93. The tip of central electrode is a
ring tip 94. All but the tips of electrodes 91 and 92 are
insulated, preferably being covered with plastic insulators 95 and
96 which may, if desired, be a single unitary elongated plastic
body in which are embedded the three electrodes 91, 92 and 93. If
electrode 93 is not embedded in a plastic body, it is covered along
its length with insulator 97.
in FIGS. 10 and 11 is illustrated a specific electrode structure
expressly designed for a surgical or medical method or process of
rendering the human female sterile. In FIG. 10 is illustrated a
fiber optic core, generally designated 101 for a surgical electrode
specifically adapted for sterilization of the human female. The
point 101A of this fiber optic core 101 in combination with other
structures as will be described in connection with FIG. 11 is
adapted to be maneuvered to a position proximate to the fallopian
tube opening. The other end 101B is mounted into a handle 102 on
which is an eyepiece 103, as for example, a rubber eyepiece. The
entire instrument is approximately 24 inches long and the fiber
optic core approximately 1/4 inch in diameter.
In FIG. 11, the fiber optic core 101 is sheathed within a plastic
sheath 105 to form a surgical electrode generally designated 106
and a lens 107 optionally of glass or plastic is mounted at the end
of the core 101 and adapted to focus an image onto the ends of the
optical fibers. Mounted piggy back on sheath 105 is an electrode
sheath 108 in which is positioned an electrode wire 109 terminating
in an electrode tip 110. The wire 109 is easily slidable within the
electrode sheath 108 so that the electrode tip may be withdrawn
into resting contact with the end of the electrode sheath or, as
shown, may be extended from the electrode sheath 109 into an
operating position.
In use and operation, the electrode 106 is inserted within the
uterus and guided by the doctor's eye into position at the entrance
to the fallopian tube. The electrode tip 110 is then extended from
its sheath 108 and maneuvered with optical guidance a short
distance into the tube. The electrode is then energized causing
electrical cauterization wholly within the fallopian tube. Scarring
results, causing complete sealing of the tube. When the purpose of
the treatment is individual and when it is important to know with
certainty whether sterilization has been achieved, it is important
to maintain post-operative tests and to be preapred for
hospitalized surgery if the treatment was not effective. However,
if the purpose of the treatment is solely economic, or if the
patients are not willing or able to be checked subsequently, it is
still possible to achieve a high ratio of success and to avoid in
many instances the need for hospitalization.
In FIGS. 12, 13, 14, and 15, is illustrated another specific
electrode structure expressly designed for a surgical or medical
method or process of rendering the human female sterile.
Referring now to FIG. 12 in particular, the electrode or fiber
optic scope 140 including sheath assembly 141, electrode 142, light
source 143, power 144 and fluid supplies 145, eyepiece focusing
lenses 146 is shown in place in the uterus with electrode 140
extended as in use for cauterizing a fallopian tube 148 via the
cervix 147.
Referring now to FIG. 13 in particular, there is shown the
cauterizing and objective end of the sheath assembly 141 which
consists of an outer sheath 149, an electrode sheath 150 containing
a retractable and advanceable electrode 151 which is coated with
electrical insulating material along its length but not at the tip,
a fiber optics sheath 152 and an objective lens or lens assembly
153. In the case where the fiber optics 154 consists of a coherent
bundle, a single objective lens will distribute the light from the
bundle to the field of view and also conduct the image back to the
eyepiece 146. In the case where an incoherent bundle is used to
light the field and a separate coherent bundle is used to conduct
the image, a more complex lens 153 or lens assembly would be used.
The electrode sheath, fiber optics sheath and outer sheath are made
of tubing and may be bonded or fused together. The objective lens
is fabricated separately and bonded or fused to the fiber optics
sheath. The objective lens is so designed that when the fiber
optics are in place, they abut the edge of the lens protruding into
the fiber optics sheath 152 to so provide for the proper
separations between the end of the fiber optics and the optical
surface of the lens. The space 158 between the fiber optics sheath
152, the electrode sheath 150 and the outer sheath 149 may be used
to conduct a solution into the uterus to clean the visual field at
the objective lens 153. In order to prevent fluid leakage about the
electrode, a fluid-tight seal 155 may be provided concentric to the
electrode and its sheath after the electrode sheath emerges through
the outer sheath proximate to the eyepiece end of the sheath
assembly. A seal 156 is also provided to close off the water
conducting space between the fiber optic sheath 152 and the outer
sheath 149 at the eyepiece end of the sheath assembly.
It is possible, according to this embodiment of the invention, to
produce simple, inexpensive surgical electrode sheath assemblies at
a cost essentially comparable to the cost of sterilizing these
sheaths. Accordingly, a new and unused and therefore sterilized
electrode sheath assembly 141 may be employed on one human or
animal and immediately thereafter thrown away to permit the
immediate use of a new, and therefore sterilized electrode sheath
assembly 141. Since the electrode sheath assembly encloses that
portion of the fiber optics core inserted into the body cavity, the
fiber optics need not be sterilized.
* * * * *