Year: 1888

page_text: Date of Application, 3rd Apr., 1858
Specification Accepted, 22nd June, 1888
1. ADDISON DUNBAR, Physician, of Campbell, Hunt County, State of Texas in
the United States of America, do hereby declare the nature of this invention and in
what manner the same is to be performed to be particularly described and ascer-
tained in and by the following statement :-
My invention relates especially to improvements in combined hypodermic syringes
and lances, and the especial object of the improvement is to provide means for insert-
ing the needle without pain to the patient and it also aims to improve the construction
and operation of this class of devices as will be hereinafter fully described and pointed
out in the claims.
In the accompanying drawings
Fig. 1 is a side elevation of my improved device.
Fig. 2 is a central vertical longitudinal section of the same.
Fig. 3 is a vertical cross section of the device on line - of Fig. 1.
Fig. 4 is a detail perspective view of the needle carrier.
Fig. 5 shows the lance which may be substituted for the needle shown in the other
figures.
Referring to the drawings by letter, A designates a hollow tube or barrel having a
cut-away side portion, u. Within this barrel A, I place a transparent tube 13, made
preferably of glass, and this tube has a series of graduations b marked upon that part
thereof which passes along or covers the cut-away side portion a of the barrel A.
The graduations are viewed from the outside through the cut-away portion of the
barrel and indicate the amount of medicine in the syringo so that the physician can
readily determine the dose. The ends of the barrel A are externally screw threaded,
and one end is closed by a cap, (, screwed thereon. The piston rod I) works through
this cap and carries the piston. d, on its inner end, and is provided with an enlarged
head, knob, or button, d, on its outer end and which forms a handle therefor.
The piston d fits tightly against the inner surface of the tube B and the button_or
head d forms a bearing for the thumb of the operator when the device is in use. E is
a nut or stop longitudinally adjustable on the piston rod, to limit the motion of the
same.
F is a sleeve socured upon that end of the barrel A which is not closed by the

page_text: cap C, and this sleeve has a diaphragm near one end, which, when the sleeve is
secured upon or to the barrel will fit up close against the end of the said barrel and
prevent the escape of medicine from the barrel except as hereinafter specified.
The diaphragm fis perforated at its contre, and through this perforation extends one
end of a small outlet tube G.
This end of the said outlet tube projects a short distance into the tube B and is
provided at its extremity with a small annular flange the function of which will
presently appear. The other end of this outlet tube G'screws into the needle carrier H
and the needle carrier is formed with a central longitudinal channel which communi-
cates with and forms practically a continuation of the said outlet tube. The needle I is
provided with an enlarged internally screw threaded socket i which engages the needle
carrier to secure the needle thereto.
The needle also is provided with a longitudinal tubular passage i¹ as shown which
extends the entire length of the needle and communicates with the passage in the
needle carrier. The needle carrier is provided with a rearwardly extending cylindrical
portion, J, made integral therewith and extending nearly to the diaphragm f' in the
sleeve F.
This cylindrical projection J is provided with an annular groovej which is engaged
by a latch K to holl the needle carrier within the sleeve F.
L is a coiled spring arranged around the tube G within the cylinder, J, and having
its ends bearing against the needle carrier and the diaphragm f. In use this spring
exerts a continual pressure on the needle carrier and tends to project it from the sleeve
as will be readily understood.
The latch K is an open rectangular frame which surrounds the sleeve F and the
lower cross bark of which passes through a slot in the said sleeve to engage the
groove; in the cylinder J. The latch is held upon the sleeve by a bracket or attaching
plato M, the edges of which m, aro provided with notches through which the side bars
of the latch pass.
This attaching plate M is secured to the sleeve F by means of a screw m¹ which is
passed through the plate into the sleeve, and where so desired, this screw may bo
extended through the sleeve to engage a longitudinal groove in the cylinder J and
thereby prevent the cylinder rotating when it is projected.
The upper cross bar of the latch is provided with a button K by means of which
the latch may be depressed.
N is a coiled spring placed between the upper cross-bar of the latch and the sleeve F.
This spring N it will be readily seen, serves to hold the latch in engagement with the
groove in the cylinder J.
O is the lance which may be substituted for the needle I, when it is desired to lance
abscesses, tumors, etc.
It will be seen that it is of the same general construction as the needle and is
secured to the needle carrier in the same manner.
In operation, morphine or other medicine is placed in the tube B and the piston
rod then placed therein and secured by serowing the cap C up on the end of the
barrel A.
The device is now placed in operative position i.e. with the needle point resting
against the skin of the patient. A slight pressure on the button K will release the
latch K from engagement with the cylinder J when the spring L, will cause the needle
carrier to immediately project itself from the sleeve F and the needle will pierce tho
skin with such rapidity as to be painless. The piston is now operated in the usual
manner to inject the medicine which will pass through the tube, the needle carrier
and the needle into the flesh of the patient.
It will be seen from the drawings that the noodle carrier will not be projected from the
sleeve F entirely as that is prevented by the flange. g. contacting with the diaphragm. f.
or rather, washer placed thereagainst, for it will be readily understood that washers
and other packing are employed at all the joints to prevent leakage and though I have
shown them in the drawings I have thought it unnecessary to specifically refer theroto
herein.

page_text: From the foregoing description taken in connection with the accompanying drawings,
the advantages of my device will be readily appreciated and need not be referred to
further herein.
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 :-
1. The combination, in a syringe, of the barrel, a sleeve secured at one end thereto,
a spring actuated needle carrier working in said sleeve, and a latch carried by said
sleeve and engaging the needle carrier, substantially as set forth.
2. The combination, in a hypodermic syringe, of a barrel, a sleeve secured thereto,
a spring actuated needle carrier working in said sleeve, an outlet pipe secured to the
needle carrier and extending into the barrel, a tubular needle secured to the needle
carrier, and a spring actuated latch secured to the sleeve to retain the needle carrior
therein, substantially as set forth.
3. In a syringe, the combination of a barrel, a sleeve secured to said barrel and
having a diaphragm adapted to close the end of the barrel, a needle carrier_having_a
cylindrical projection working in the sleeve, an outlet tube secured to the needle
carrier, and extending through the diaphragm in the sleeve, and a coiled spring
arranged around said tube within the cylindrical projection of the needle carrier,
substantially as specified.
4. In a syringe, the combination of the barrel, the sleeve secured to the barrel, the
needle carrier working in said sleeve and having an annular groove, and a spring
actuated latch secured to said sleeve and engaging the annular groove in the needle
carrier, substantially as set forth.
BERNHARD DUKES,
226, High Holborn, London, W.C.,
Agent for the Applicant.