A Laryngoscope.
Year: 1889

page_text: Date of Application, 4th May, 1889
Complete Specification Left, 4th Sept., 1889-Accepted, 12th Oct.. 1889
PROVISIONAL SPECIFICATION.
A Laryngoscope.
ROBERT HENRY CLARKE, MA, MB., MR.C.S. Clarence Lodge, Redhill, Surrey,
Surgeon do hereby declare the nature of this invention to be as follows.-
My Invention consists in "A Laryngoscope for Horses." The object of this
invention is to enable the condition of the Larynx to be examined from below, so that
in the case of a horse affected with "roaring" this organ may be viewed while the
sound so named is emitted by the animal. My invention is constructed and operated
as follows.-A piece of flat tubing is selected of suitable size for my purpose and
through part of it two insulated metallic conductors are passed. At any convenient
point of the flat tube near to one end is mounted an ebonite or other insulated sliding
block supporting a horizontal concave silvered mirror upon which is mounted a smal
incandescent lamp preferably of flat shape. Hollow metallic terminals are formed
upon the front side of the insulated block and to these the platinum leading in wires
of the lamp are secured. Part of both insulated metallic conductors are bared and
passed into the hollow terminals, thereby ensuring good metallic contact with the
lamp filiament
At the end of the flat tube opposite that to which the sliding insulated block 18
fastened a small collar is formed for securing a nut having a milled head. A screwed
spindle engages with this nut at one end of the said spindle, the other being suitably
fastened to the front end of the insulated sliding block or mirror thereon which at the
back end operates, by means of a link or its equivalent, a hinged vertical adjustable
mirror My invention is put into operation as follows :-An incision is made into the
Trachea and in this is mounted a Tracheal tube. The conducting wires attached to
the lamp are now connected to a primary or secondary battery or any other suitable
source of electricity, and the Laryngoscope passed in. By means of the nut operating
the insulated sliding block and the hinged vertical mirror thereto attached the light
thrown by the lamp upon the larynx is reflected to such an angle as will enable the
operator to observe its action from below.
The second part of my invention consists in the adaptation to the laryngoscope of a
glazed cover so formed as to be easily fitted to any type of tracheal tubo employed.
The glass or equivalent cover is preferably mounted in a metal ring, a suitable space
or opening being left for the flat tube of the laryngoscope to pass through it By
means of the transparent cover described the escape of air through the tube is
avoided.
Although I have described my invention as especially applicable for Laryngeal
examinations in horses it can of course be reduced in size so as to be suitable for
equivalent purposes in any other animal or the human subject.
FRANCIS M ROGERS,
Agent for Applicant.
COMPLETE SPECIFICATION.
A Laryngoscope.
ROBERT HENRY CLARKE M.A., M.B., M.R.C.S Clarence Lodge Redhill Surrey
Surgeon, do hereby declare the nature of this invention and in what manner the
same is to be performed, to be particularly described and ascertained in and by the
following statement:-
My Invention consists in "A Laryngoscope for horses." The object of this

page_text: invention is to enable the condition of the larynx to be examined from below, so that
in the case of a horse affected with " roaring" this organ may be viewed while the
sound so named is emitted by the animal.
My
My invention is constructed and operated as follows -A piece of flat tubing is
selected of suitable size for my purpose, and through part of it two insulated metallic
conductors are passed. At any convenient point of the flat tube near to one end is
mounted an ebonite or other insulated sliding block supporting a horizontal concave
silvered mirror upon which is mounted a small incandescent lamp preferably of flat
shape. Hollow metallic terminals are formed upon the front side of the insulated
block and to these the platinum leading in wires of the lamp are secured Part of
both insulated metallic conductors are baied and passed into the hollow terminals,
thereby ensuring good metallic contact with the lamp filiament. At the end of the
flat tube opposite that to which the sliding insulated block is fastened a small collar
is formed, for securing a nut having a milled head A screwed spindle engages
with this nut at one end of said spindle the other being suitably fastened to the front
end of the insulated sliding block or mirror thereon which at the back end operates
by means of a link or its equivalent a hinged vertical adjustable mirror
Invention is put into operation as follows:-An incision is made into the Trachea, and
in this is mounted a tracheal tube The conducting wires attached to the lamp are
now connected to a primary, or secondary battery, or any other suitable source of
electricity, and the laryngoscope passed in. By means of the nut operating the
insulated sliding block and the hinged vertical mirror thereto attached the light thrown
by the lamp upon the larynx is reflected to such an angle as will enable the operator
to observe its action from below The second part of my invention consists in the
adaptation to the laryngoscope of a glazed cover so formed as to be easily fitted to
any type of tracheal tube employed The glass or equivalent cover is preferably
mounted in a metal ring a suitable space or opening being left for the flat tube of the
laryngoscope to pass through it By means of the transparent cover described the
escape of air through the tube is avoided. Although I have described my invention
as especially applicable for Laryngeal examinations in horses, it can of course be
reduced in size so as to be suitable for equivalent purposes in any other animal or the
human subject.
To enable my invention to be more clearly understood I will now proceed to describe
the same by means of the accompanying drawings in which :-
Fig. 1, is a side elevation of the laryngoscope.
Fig 2, is a plan of the same.
Fig. 3, is a side sectional elevation of the sliding block shewing hollow terminal,
also a side elevation of regulating nut with collar, both to enlarged scale.
Fig. 4, is an end view of tube to enlarged scale; the regulating nut and collar, and
the conducting wires being removed.
Fig. 5, is a plan of regulating nut and collar to enlarged scale
Fig. 6, is a side elevational view of sliding block and mirror to enlarged scale.
Fig. 7, is a full sized sectional view of the upper part of Trachea of a horse ;
shewing tracheal tube and laryngoscope in position, with glazed cover fitted thereto.
Fig. 8, front view shewing one method of mounting glazed cover upon laryngo-
scope.
Fig. 9, is a front view shewing form of cover employed for tracheal tubes having
convex surface.
Fig. 10, is a side elevation of same.
a, Figs. 1, 2, 3, 4, 5, 6, 78, is a flat shaped tube formed of metal or other suitable
material, 66, are the insulated conductois, c, the sliding block, e, concave mirror,
t, the incandescent electric lamp preferably of flat shape fastened thereto by binding
wires, or it may be cemented or secured in any other suitable manner. Two insulating
collars formed of ivory, ebonite, or equivalent non conducting material 9 g¹, are
passed into the concave mirror e, and the leading in wires 22, of lamp f, passed
through them and secured to nuts ', upon hollow terminals ².
A part of the

page_text: insulated coating is removed from each conductor 6 61, and the bare wire passed into
the tube shaped or hollow terminals h h¹, thereby securing good electrical contact
with the leading in wires 1, 2 of lamp f
At the end of flat tube a, opposite sliding block c, mounted thereon is a regulating
nut with collar k. The tube a, is slotted out so as to receive the collar forming part
of the nut k Through a tapped hole in the centre of nut and collar k, a screwed
spindler, passes, the opposite end of this spindle being fastened by screwing or
pinning to sliding block c, which is hollowed out so as to slide upon the tube a.
Hinged to concave mirror e, secured as described to block c, is a small mirror n,
which is mounted in an adjustable metal ring 1, a steady pin fastened to base of
ring, passes through a hole provided for it in tube a In some cases I mount the
mirror n, in a plain ring 1, having a stem m, or equivalent device
The mirror n, is
preferably fastened to stem m, by a set screw w, to facilitate its removal and
replacement; the stem m, being hinged as at x and secured to mirror e, by links y-
see fig. 6.
By turning the regulating nut k. which is prevented from moving by the collar;
the spindler,
causes the sliding block to travel forward or backward, thereby
tilting the mirror and directing the light thrown upon the parts under examination
by the lamp f, to the eye of the operator.
The operation of this first part of my invention is as follows
-
An incision is made into the Trachea as at o, Fig. 7, and a tracheal tube p,
inserted therein. The laryngoscope is now passed in and conductors bb, connected
to a primary or secondary battery or other suitable source of electricity capable
of lighting the incandescent electric lamp employed, see fig 2. By means of the
nut k, and spindle r. operating the adjustable mirror n, the light emitted by the lamp
can be thrown upon the under surface of the glottis 1, vocal chord 2, and arctenoid
cartilage 3. The larynx can by this means be examined from below, and in the case
of a horse affected with " roaring" this organ can be viewed while the sound so
named is emitted by the animal
The second part of my invention consists in the adaptation to the laryngoscope of a
glazed cover so formed as to readily fit any type of tracheal tube employed. The
glazed covers, see figs. 7 & 8. is sometimes mounted in a metal ring t, part of which
is formed so as to slide within the tracheal tube p, a small hole u, is provided either in
the glass cover or the ring containing it, through which the tube a, passes. Spring-
clamps r, see fig. 8, heing provided to keep the tube in position and at the same time
permit it to slide in and out to any required distance, this form of cover is more
particularly suited to Tracheal tubes having a flat outer surface; when however the
outer surface of the tracheal tube is rounded or convex I prefer to employ the form of
cover shewn in figs. 9. 10. This is preferably secured to the tube by a button, z, a
suitable space u being provided for the tube of laryngoscope; by slipping the curved
fork g, of the cover under the button and drawing the cover outward and towards the
operator the laryngoscope can be passed into the tube, the cover is then pressed
inwards and locked to the tube by a snap d, or equivalent device.
Although I have described my invention as especially suited for laryngeal
examinations in horses, it can be modified in any suitable manner for equivalent
purposes in any other animal or the human subject. It is obvious also that the shape
of the glazed cover and its attachment to the tube of laryngoscope may be varied in
detail to suit the particular conformation of the tracheal tube employed, without
departing from the spirit and intent of my invention.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:-
1st. A Laryngoscope fitted with, and illuminated by an incandescent electric lamp,
horizontal concave, and adjustable mirror operated by regulating nut, in the
manner described, for the purpose of examining the larynx from below,

page_text: 2nd The combination in or with a laryngoscope constructed as described for
laryngeal examinations in horses from below, of block c, sliding upon tube a,
operated by screwed rod r, and regulating nut 4, the horizontal concave mirror e,
supporting incandescent lamp f, and the adjustable mirror n, hinged as shewn and
operating therewith as described
3rd. The combination in or with a laryngoscope constructed in the manner and
for the purposes described in claim 2 of the hollow terminals h, h¹ with metallic
conductors sliding therein for conveying the electric current to the incandescent
lamp mounted upon the sliding block c.
4th. The combination in or with a laryngoscope constructed in the manner and
for the purposes described, of the glazed cover for closing the tracheal tube
employed in such operations substantially as described under figs 89, 10
Dad
4th 1900
FRANCIS M. ROGERS,
Agent for Applicant