Improved Apparatus for the Production of Local Anaesthesia.
Year: 1895

page_text: Date of Application, 17th July, 1895-Accepted, 24th Aug., 1895
COMPLETE SPECIFICATION.
Improved Apparatus for the Production of Local Anaesthesia.
I, CHARLES BROILLET of Fribourg, Switzerland, Physician Dentist, do hereby
declare the nature of my 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 relates to apparatus for the production of local anaesthesia by
means of a volatile anaesthetical liquid such as for example ethyl chloride, and
has for its object the construction and arrangement of such an apparatus whereby
the advantage is obtained of the surgeon, physician, or dentist, who owns the
apparatus being able to repleuish it afresh without the necessity of returning it to
the manufactory, as now obtains with the reservoirs of ethyl chloride at present
in use.
This apparatus offers the further advantages that it is perfectly tight, and avoids
the dispersion of the liquid, that the flow of the jet of volatile liquid can be
interrupted at will and with great facility by the simple manipulation of a cone
valve.
.
Lastly in this apparatus the flow of volatile liquid passes along a tube which is
attached in a removable manner in such a way that a person can at will adapt to
the apparatus a tube of variable form or size, according to the operation required
or the force of the jet that is desired to be obtained, besides in order to avoid or
at least reduce the obstruction of the tube I provide a filtering tissue through.
which the liquid is obliged to pass before reaching the tube.
In order that my invention may be the better understood I will now proceed to
describe it in relation to the accompanying drawings hereunto annexed reference
being had to the letters and figures marked thereon like letters refer to like parts
in the various figures.
Fig. 1 is an elevation part sectional view of one form of my apparatus with the .
valve closed and with the issue tube removed.
Figure 2 is a similar view with the issue tube attached and with the valve shown
open.
Figs. 3 and 4 show issue tubes of the straight and curved form respectively.
As will be seen from Figs. 1 and 2 the apparatus consists of a metal reservoir A.
provided with a nozzle a having a screw thread a' on which is screwed a connection B.
having a channel which follows a broken line so that there is arranged in this.
passage a conical seat c for the point d of the valve D carried in a casing C
perpendicular to the connection B.
The point between the end of the nozzle a and the connection B is effected by
one or more packing washers e of any convenient material such as leather and the
said connection is furnished with two lateral wings ff, to enable it to be screwed
tightly to the nozzle a with ease.
An
The lateral casing C of the connection B which embraces the valve D is closed
by a cover E screwed on to the said case, and is pierced with a hole through which
passes the stem of the valve D, which is terminated by a square part h.
enlarged party of this stem is provided with a screw thread, which engages into a
screwed portion of the casing C, so that on engaging upon the square parth, a key
such as F formed with a boss having a square hole and having two lateral wings,
one can at will by turning this key and with it the valve D in one or other
direction, close or open the valve, that is to say to make the conical periphery of

page_text: the point & bear on its seat c as show in Fig. 1 or to loosen it from this latter as
shown in Fig. 2.
In order to prevent the escape of the volatile liquid from the casing C packing
washers of any convenient material, such as leather, are maintained between
metal washers e e' upon the stem of the valve.
The upper extremity of the connection B is widened and provided with a screw
adapted to engage a hollow screwed piece H provided with a boss r having a milled
edge to facilitate the screwing of H on to and unscrewing, of H from the part j.
A washer is provided at the bottom of the part upon which is placed a disc of
fabric adapted to filter the liquid as it escapes from the passage C.
The 'apparatus is completed by a certain number of tubes with straight ends -I
(Fig. 3) and with curved ends K (Fig. 4) of which the issue orifice is more or less
narrowed according to the nature of the operations to be effected; each of the
tubes being constituted with a body m straight or curved, in glass, attached to a
metal piece n' having a' shoulder O.
In order to use the apparatus the piece H is unscrewed and one or other of the
tubes is placed in the part-j of the, connection B, so that the metal shoulder n rests
on the filtering tissue, the piece H is then screwed into the connection B so that
the pressure produced by the screwing down of the part H makes a joint between
the metal shoulder O the tissue the washer, and the connection B as shown in
Fig. 2. To use the 'apparatus it is only necessary to open the valve D (Fig. 2)
and to direct the jet 'escaping by the tube upon the face to be treated. In closing
afterwards the valve-D, the escape of the contents of the reservoir by the tube is
interrupted until another operation is to be made. On unscrewing the connection B
from the container A, the operator (physician, surgeon, dentist,) can easily
replenish afresh the container A with ethyl chloride, or other volatile anaesthetical
liquid, without being obliged to return the apparatus to the manufactory.
Having now particularly described and ascertained the nature of the said inven-
tion and in what 'manner the same is to be performed, I declare that what I
claim is :-
1st. An apparatus for the production of local anaesthesia constructed and
arranged substantially as described and illustrated in the accompanying drawings.
2nd. In such an apparatus as claimed in Claim 1 the arrangement of a filtering
device in the flow channel of the apparatus, to prevent the obstruction of the issue
pipe substantially as described.
3rd. An apparatus for the production of local anaesthesia, by a volatile
anaesthetic liquid, consisting of, in combination, a metallic reservoir for the
liquid, "a discharge device screwed thereon provided with a screw down cone valve,
and adapted to receive an interchangeable issue nozzle, by means of a screwed
hollow plug, to éuable an operátor, to, himself, recharge the reservoir with liquid,
and to interchange various nozzles to suit the operation, substantially as described.
Dated this 17th day of July 1895.
FELL & WILDING,
"Agents for the 'Applicant.