A New or Improved Method of Producing, and Apparatus for the Administration of, Anesthetics, or other Volatile Vapours.
Year: 1897

page_text: OOL L
Date of Application, Mar.,
1000
7007
Complete Specification Left. 20th Dec.. 1897-Accepted. 5th Feb. 1898
Complete Specification Left. 20th Dec., 1897-Accepted, 5th Feb, 1898
A New or Improved Method of Producing, and Apparatus for the
Administration of, Anesthetics, or other Volatile Vapours.
I, FREDERICK THOMAS GEORGE HOBDAY, of the Royal Veterinary College, College
Street, Camden Town, in the County of Middlesex, M.R.C.V.S., Veterinary
Surgeon, do hereby declare the nature of this invention to be as follows:-
In the specification of my patent dated the 10th October 1895, No. 19018, I have
described an apparatus for the production and administration of anaesthetic or
other volatile vapours, whereby air is drawn into the bottle by suction, it entering
through an open ended tube passing therefrom by a non return valve, over the
surface of the liquid, and through the suction pipe by means of a flexible pump
to the mask, and a comparatively lightly impregnated vapour is thereby
administered. Before my aforesaid invention it was common to force the air through
the liquid, whereby very heavily impregnated vapour was administered; now the
object of this present invention is to administer air or gas impregnated with the
volatile vapour in a medium degree only. With the above object in view I provide
a tube passing through the stopper of the bottle containing the (say anaesthetic)
fluid the outside end of the pipe being in connection with the tube through which
the air is forced and the air thereby caused to impinge directly upon the surface
of the liquid in the bottle, but the tube end must not extend to the surface of the
liquid itself.
The air thus forced into the bottle and becoming impregnated in a medium
degree with the volatile vapour, passes off by a second open ended tube, carried by
the stopper above the level of the liquid, and this second tube is in connection with
a flexible tube leading to the mask. This flexible tube is provided with a tap for
regulating the supply of impregnated air.
Such an apparatus as that before described may be supplied with air or gas from
a pressure reservoir containing compressed air or gas.
A New or Improved Method of Producing, and Apparatus for the
Administration of, Anæsthetics, or other Volatile Vapours.
I, FREDERICK THOMAS GEORGE HOBDAY, of the Royal Veterinary College, College
Street, Camden Town, in the County of Middlesex, M.R.C.V.S., Veterinary
Surgeon, do hereby declare the nature of this invention and in what manner the
[Price 8d1

page_text: same is to be performed to be particularly described and ascertained in and by
the following statement:-
-
In the specification of my patent dated the 10th October 1895, No. 19018, I have
described an apparatus for the production and administration of anæsthetics or
other volatile vapours, whereby air is drawn into the bottle by suction, it entering
through an open ended tube, passing therefrom by a non-return valve over the
surface of the liquid, and through the suction pipe (by means of a flexible pump)
to the mask, and a comparatively lightly impregnated vapour is thereby
administered. Before my aforesaid invention it was common to force the air
through the liquid, whereby very heavily impregnated vapour was administered;
now the object of this present invention is to administer air or gas impregnated with
the volatile vapour in a medium degree only.
I will now describe my invention with reference to the accompanying drawings,
whercon Fig. 1 shews my improved apparatus, and Fig. 2 is a sectional elevation
of the bottle (detached) for containing the anesthetic fluid or other material.
According to my said invention, I provide a pipe A passing through the
stopper B of the bottle C containing the (say anaesthetic) fluid, the outside end of
the pipe A being in connection with a tube A', through which the air is forced,
say by a flexible ball E having an inlet valve E, and communicating through a
valve controlled passage, with an ordinary elastic reservoir E2 from which the air
is forced through to the pipe A. The air is thus caused to impinge directly upon
the surface of the liquid in the bottle, but the end of the pipe A must not extend
to the surface of the liquid itself.
The air thus forced into the bottle C and becoming impregnated in a medium
degree with the volatile vapour, passes off by a second open ended pipe F carried
by the stopper B above the level of the liquid, and this second tube F is in con-
nection with a flexible tube G, leading to the mask H; this flexible tube G is
provided with a tap G₁ for regulating the supply of impregnated air. Of course
if desired the pipes A and F may extend somewhat further into the bottle than
is shewn in the accompanying drawings.
Such an apparatus as that before described may be supplied with air or gas
from a pressure reservoir containing compressed air or gas.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed I declare that what I claim is:
1. The new or improved method of producing air or gas impregnated to a
medium degree with anæsthetic, or other volatile vapour, consisting in forcing air
through a tube, into a container, in such manner that the air is caused to impinge
with a certain degree of velocity upon the surface of the liquid, and is carried off
properly impregnated with the anesthetic, by a second open tube, and conducted
thereby to the mask, whereby air or gas is administered or produced carrying a
medium quantity of volatile vapour, substantially as set forth.
2. The combination with a container; of an open ended tube in connection with
an air or gas force pump or pressure reservoir, such tube entering the container
with its open end above the liquid, and a second open ended tube, communicating
with the interior of the reservoir, and by which the impregnated air or gas is
carried to the mask, substantially as and for the purposes described and illustrated
with reference to the accompanying drawings.