Improvements in Surgical Injectors and the like.
Year: 1893

page_text: Date of Application, 12th Dec., 1893
Complete Specification Left, 11th Sept., 1894-Accepted, 13th Oct., 1894
PROVISIONAL SPECIFICATION.
Improvements in Surgical Injectors and the like.
A communication by the Firm of JETTER & SCHEERER, of Tuttlingen,
Wurtemberg, in the Empire of Germany, Surgical Instrument Makers.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of The Agency for
Foreign Patent Solicitors, 6 Lord Street, Liverpool and 6 Bank Street,
Manchester both in the County of Lancaster and 323 High Holborn in the
County of Middlesex, Civil Engineer, do hereby declare the nature of this
invention to be as follows:-
The present improvement in subcutaneous injectors, shown on the accompanying
drawing, in Figures 1 to 6, consists in the use of a plunger, which is connected by
means of a screwed cap with the injector cylinder or casing in such a way as to be
air tight, as well as in the further arrangement that the stroke of the plunger may
be limited in each direction of movement, and, further, that the piston cannot be
entirely withdrawn from the cylinder without a special safety device being first
removed.
The use of a plunger d with a screwed cap a is for the object of allowing the
plunger to be easily withdrawn from the cylinder or casing e, and of the plunger, cap,
and cylinder being easily cleaned. For this latter object, the nozzle g, together with
the injecting needle f, is not screwed into the cylinder, but is merely inserted in it
in such a way that it fits perfectly air tight in the latter.
The cylinder or casing may be made of any suitable metal or glass, but
preferably the latter, and is marked with a scale by which the quantity of substance
injected may be exactly ascertained.
In order to limit the stroke of the piston in either direction, one or two rings / h¹,
which are adjustable on the cylinder e, are employed, and these rings may be
either arranged as clamp rings, as shown in Figure 4, or as whole rings with a set
screw, as shown in Figure 6. The spring arm of the curved piece C is attached
to the plunger d, and its curved point c rests against the adjusting ring h..
If the plunger d be drawn back by means of its head i, the point c of the
curved piece Cencounters the screwed cap a, and arrests the plunger, before the
latter is entirely drawn out. When the latter is intended to be entirely drawn
out, the contact point c, which has, as hereinbefore stated, a spring arm, is raised,
The washering
the plunger drawn out and the point c then slides over the cap a.
of the plunger takes place, as stated, by means of the screwed cap a, the inner
thread of which engages in the thread of a ring k attached to the end of the
injector-cylinder, whilst a washer ring b is pressed tightly between the end of the
injector and the cap, and renders the plunger tight fitting. By means of the handle
or operating piece i, the plunger d and the curved piece C are held firmly together;
and, by unscrewing the handle, the plunger, handle, and the curved piece C are
separated, and may be easily and thoroughly cleaned..
L1002

page_text: A communication by the Firm of JETTER & SCHEERER, of Tuttlingen,
Wurtemberg, in the Empire of Germany, Surgical Instrument Makers.
I, WILLIAM PHILLIPS THOMPSON, F.C.S. M.I.M.E. of The Agency for
Foreign Patent Solicitors 6, Lord Street, Liverpool and 6, Bank Street,
Manchester, both in the County of Lancaster and 323 High Holborn in the
County of Middlesex, Civil Engineer, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :-
The present improvement in subcutaneous injectors, shown on the drawing
accompanying the Provisional Specification in Figures 1 to 6, consists in the use
of a plunger, which is connected by means of a screwed cap with the injector
cylinder or casing in such a way as to be air tight, as well as in the further
arrangement that the stroke of the plunger may be limited in each direction of
movement, and, further, that the piston cannot be entirely withdrawn from the
cylinder without a special safety device being first removed.
The use of a plunger d with a screwed cap a is for the object of allowing the
plunger to be easily withdrawn from the cylinder or casing e, and of the plunger,
cap and cylinder being easily cleaned. For this latter object, the nozzle g, together
with the injecting needle f, is not screwed into the cylinder, but is merely inserted
in it in such a way that it fits perfectly air tight in the latter.
The cylinder or casing may be made of any suitable metal or glass, but preferably
the latter, and is marked with a scale by which the quantity of substance injected
may be exactly ascertained.
.. In order to limit the stroke of the piston in either direction, one or two rings hh',
which are adjustable on the cylinder e, are employed, and these rings may be either
arranged as clamp rings, as shown in Figure 4, or as whole rings with a set screw,
as shown in Figure 6. The spring arm of the curved piece C is attached to the
plunger d, and its curved point a rests against the adjusting ring h.
If the plunger d be drawn back by means of its head i, the point c of the curved
piece C encounters the screwed cap a, and arrests the plunger, before the latter is
entirely drawn out. When the latter is intended to be entirely drawn out, the
contact point c, which has, as herein before stated, a spring arm, is raised, the
plunger drawn out and the point then slides over the cap a. The washering of
the plunger takes place, as stated, by means of the screwed cap a, the inner thread
of which engages in the thread of a ring k attached to the end of the injector-
cylinder, whilst a washer ring b is pressed tightly between the end of the injector
and the cap, and renders the plunger tight fitting. By means of the handle or
operating piece i, the plunger d and the curved piece C are held firmly together;
and, by unscrewing the handle, the .plunger, handle, and the curved piece C are
separated, and may be easily and thoroughly cleaned.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, as communicated to me by
my foreign, correspondent, I declare that what I claim is :-
In surgical subcutaneous injectors and the like, the use of a plunger secured by
means of a screwed cap, the stroke of which plunger, with the object of allowing
exactly determined quantities of the injection to be injected, may be limited in
either direction by means of a curved piece and contact rings, which also serve for

page_text: preventing the plunger being accidentally entirely drawn out of the cylinder,
whilst, on a spring arm being lifted, the plunger may be entirely removed,
substantially as herein before described and shown.
Dated this 10th day of September 1894
WM. P. THOMPSON & Co.,
Agents.