Year: 1892

page_text: Date of Application, 31st Dec., 1892-Accepted, 11th Feb., 1893

page_text: The pin or studi which plays a double part, that of a regulator by which the
dose to be injected is to be determined, and also as a means by which the injection
is effected by pressure, has one end provided with a flange k carrying an index
hand which turns upon the graduated disc c, whilst the other end of the studi
terminates in a button m to which pressure can be applied.
The cam is guided by and presses against an arm either fixed or moveable by
means of a nut as shewn at in Figures 3 and 4, and the stud i passes through
and turns in the end of the arm h.
My apparatus may also have the slightly modified arrangement illustrated in
Figures 5 to 8.
In this form the flexible membrane b, the disc c, and the button m, may be firmly
attached together by a screw n, as the section Figure 7 shows, and in order to
determine the dose of liquid to be introduced into the apparatus, the index hand Z.
in the form shewn in Figures 1 and 4 is replaced by simple graduated marks upon
the glass bottom e.
The method of operation is as follows:-
In order to charge the instrument it is sufficient to plunge the discharge pipe f
into the bottle, and the liquid to be injected can then be drawn directly up by
operating the button m.
To effect the injection the tubular needle o Figure 3, is fixed upon the discharge.
pipe and the same movement of pressure determines the discharge of the liquid.
In the form represented in Figures 1 to 4 the quantity is determined by the
greater or less movement of the membrane towards the cover by means of the
cam k which is turned by the button m until the determined graduation has been
reached. This movement depresses the membrane which fits exactly against the
sides without leaving any space at the edge of the annular frame a which is
hollowed out in the form of a cone inside, the smaller end of such cone being
formed by the glass bottom, and the capacity of the box or case is thus diminished
in proportion to the advance of the cam towards its highest point, this capacity
determining the quantity of the liquid.
In the form shewn in Figures 5 to 8 the quantity is determined by simply
observing the height of the liquid in the box when held vertically, the discharge
pipef, being uppermost, and the height being indicated by the graduated marks
upon the glass plate e.
As the apparatus can be operated with only one hand great convenience is
afforded to the operator.
It is to be understood that I do not confine myself to any particular form or
dimensions of the instrument or to the materials of which it is made, which may
be varied more or less as may be found desirable, but
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 :-
:-
The apparatus or instrument for hypodermic and other injections, consisting of
a box circular or of other convenient shape, one side of which is formed of a
stretched membrane upon which pressure can be exerted by means of a device
serving to determine the quantity of liquid to be injected, substantially as and for
the purpose described and illustrated.
Teen Girls 1st day of December 1892.
EDWARDS & Co.,
35, Southampton Buildings, London, Agents for the Applicant.