Improvements in Syringes for Surgical and other Purposes.
Year: 1891

page_text: Date of Application, 11th June, 1891
Complete Specification Left, 8th Apr., 1892-Accepted, 14th May, 1892
PROVISIONAL SPECIFICATION.
Improvements in Syringes for Surgical and other Purposes.
I, JAMES ARNOLD of the firm of Arnold and Sons, of West Smithfield in the
City and County of London, Surgical Instrument Makers, do hereby declare the
nature of this invention to be as follows:-
:-
Heretofore in hypodermic syringes for sub-cutaneous injection and other syringes
for surgical purposes, means have been provided for adjusting or tightening the
plunger by a nut on the plunger or piston rod; now according to my present inven-
tion I am able to dispense with the nut on the plunger rod, and the ordinary handle
or thumb screw is used for the adjusting.
To accomplish this and according to my invention, I make the plunger rod with
a flat surface or flat surfaces or of other suitable section whereby it cannot rotate
in its bearings, in this manner the adjusting rod for the plunger can be turned
without holding the plunger rod by a nut or other means as is now necessary, and
whereby the construction and action of this delicate instrument is materially
simplified.
The plunger may be made of wood pith or other suitable material which is
casily sterilized.
Dated this 11th dor of Tuno 1201
COMPLETE SPECIFICATION.
Improvements in Syringes for Surgical and other Purposes.
I, JAMES ARNOLD, of the firm of Arnold and Sons, of West Smithfield, in the
City and County of London, Surgical Instrument Makers, do hereby declare the
nature of this invention, and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement:—
Heretofore in hypodermic syringes for subcutaneous injections, and other
syringes for surgical purposes, means have been provided for adjusting or tightening
the plunger by a nut on the plunger or piston rod; now according to my present
invention, I am able to dispense with the nut on the plunger rod, and the ordinary
handle or thumbscrew is used for the adjusting.
To accomplish this, and according to my invention, I make the plunger rod with
a flat surface or flat surfaces, or of other suitable section, whereby it cannot rotate
in its bearings, and in this manner the adjusting rod for the plunger can be turned
or operated upon without holding the plunger rod by a nut or other means as is
now necessary, and whereby the construction and action of this delicate instrument
is materially simplified.
My invention will be readily understood by reference to the accompanying
drawings (where the instrument is shewn for the sake of clearness larger than it is
generally made) on which
Fig. 1 shews a longitudinal sectional elevation of a syringe constructed according
to my said invention;
Fig. 2 shews the plunger rod and piston detached from the syringe, and
Fio 3 is a trancwares cortinal
the wines in the line
V of
1

page_text: A is the barrel of the syringe; B is the cap screwed or otherwise secured to the
barrel A, the aperture in the said cap having a flat part or being otherwise formed
to suit the section of the plunger rod and prevent the latter turning. C is the
plunger rod, being formed tubular, and its outer periphery having a flat surface C¹
thereon, or as previously stated, there might be more than one such flat surface.
C2 is a flange at the end of the rod C. D is the adjusting rod for the plunger,
having a head D' at one end, and passing through the hollow plunger rod C, which
has preferably interior facets or equivalent arrangement to prevent the adjusting
rod turning, and the latter is screwed at its projecting end for a convenient length,
see Fig. 2. E is the plunger proper, formed in the example shewn, of two washers
or discs; the plunger may be made of wood-pith, or other suitable material which
is easily sterilized. The rod D passes through the plunger E, and the latter is
thus held between the heads; and F is the usual knob or head, which I screw onto
the adjusting rod D at its projecting screwed part.
To tighten or otherwise adjust the plunger or piston, the knob F is turned, and
the adjusting rod D is operated in a lateral or axial direction relatively to the
plunger rod C, thus either tightening or loosening the piston or plunger, as the case
may be, according to the direction in which the knob is turned.
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. In syringes for surgical and other purposes, the combination with a barrel
part A and a cap B, having an aperture therein to fit the plunger rod, of a hollow
plunger rod C formed with a flat part or parts C', an interior adjusting rod D, not
capable of being turned in the rod C, a plunger or piston E, made of wood-pith, or
of other suitable material, and a screwed knob F to give relative adjustment
between the rods C and D, whereby the piston or plunger may be tightened or
loosened within the barrel, all substantially as herein described.
2. The general arrangement and construction of my improved syringe for
surgical and other purposes, all substantially as herein described and illustrated
with reference to the accompanying drawings.
Dated this 8th day of April 1892.
BREWER & SON,
33, Chancery Lane, London, Agents for Applicant.