Medical syringe abstract
A medical syringe adapted for one hand operation in both aspiration
and injection modes, employs an elongated hollow cylinder having
at one end a first external flange extending at right angles to
the axis of the cylinder and an opening for receiving a piston,
the opposite end of the cylinder being adapted to detachably receive
a hypodermic needle. The syringe also employed a piston extending
slidably through said opening and being aligned with and centered
on the axis of the cylinder, there being a liquid tight seal between
said piston and said cylinder, one end of said piston being disposed
outside said cylinder, said one end being enlarged and designated
as a head, whereby when said cylinder and piston are held in one
hand and said first flange and head are squeezed together, injection
action ensues. The syringe also employs a device slidable back and
forth along the outer surface of the cylinder, said device including
a second flange extending at right angles to said axis and second
flange extension elements extending from the second flange slidably
over said first flange and engaging said head whereby when said
cylinder and piston are held in one hand and said flanges are squeezed
together, aspiration action ensues.
Medical syringe claims
What is claimed is:
1. A medical syringe adapted for one hand operation in both aspiration
and injection modes, said syringe comprising:
an elongated hollow cylinder having at one end a first external
flange having cut out regions and extending at right angles to the
axis of the cylinder and an opening for receiving a piston, the
opposite end of the cylinder having means adapted to detachably
receive a hypodermic needle:
a piston somewhat longer than the cylinder which extends slidably
through said opening and is aligned with and centered on the axis
of the cylinder, there being a liquid tight seal between said piston
and said cylinder, one end of said piston being disposed outside
said cylinder, said one end being enlarged and designated as a head,
whereby when said cylinder and piston are held in one hand and said
first flange and head are squeezed together, injection action ensues;
and
a device slidable back and forth along the outer surface of the
cylinder, said device including a second flange extending at right
angles to said axis and second flange extension members extending
from the second flange slidably through the regions of said first
flange and engaging said head whereby when said cylinder and piston
are held in one hand and said flanges are squeezed together, aspiration
action ensues.
2. The syringe of claim 1 wherein said members are oppositely disposed
parallel and axially elongated, said members being secured at one
set of corresponding ends to the second flange, the other set of
corresponding ends of said members bearing against said head.
3. The syringe of claim 2 wherein said regions are slots.
4. The syringe of claim 3 wherein said piston is a hollow cylinder
sealed at its head and open at its opposite end.
Medical syringe description
BACKGROUND OF THE INVENTION
Medical syringes are used in both injection and aspiration modes.
Conventionally, when a syringe is used to inject medicine via a
needle into a vein or the like, the operator holds the syringe in
one hand and squeezes the plunger into the syringe cylinder using
the thumb and fingers of the same hand. However, when a syringe
is used to aspirate or withdraw blood or other fluid from a needle
inserted in a vein or the like, the operator must use two hands,
typically holding the cylinder in one hand while pulling the plunger
out of the cylinder with the other hand. The present invention overcomes
these difficulties by providing a medical syringe which can be held
and operated in one hand for both injection and aspiration.
SUMMARY OF THE INVENTION
A medical syringe adapted for one hand operation in both aspiration
and injection modes, in accordance with the present invention employs
an elongated hollow cylinder having at one end a first external
flange extending at right angles to the axis of the cylinder and
an opening for receiving a piston, the opposite end of the cylinder
having means adapted to detachably receive a hypodermic needle.
The syringe also employs a piston extending slidably through said
opening and being aligned with and centered on the axis of the cylinder,
there being a liquid tight seal between said piston and said cylinder,
one end of said piston being disposed outside said cylinder, said
one end being enlarged and designated as a head, whereby when said
cylinder and piston are held in one hand and said first flange and
head are squeezed together, injection action ensues.
The syringe also employs a device slidable back and forth along
the outer surface of the cylinder, said device including a second
flange extending at right angles to said axis and second flange
extension means extending from the second flange slidably over said
first flange and engaging said head whereby when said cylinder and
piston are held in one hand and said flanges are squeezed together,
aspiration action ensues.
This device can also be detachably secured to known types of syringes
whereby these syringes also can be adapted for one hand operation
in the asiration mode.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of one embodiment of the invention
ready for use.
FIG. 2 is an exploded perspective view of the embodiment of FIG.
1.
FIG. 3 is a view in longitudinal cross section of the structure
of FIG. 1.
FIG. 4A is a view in longitudinal cross section of a second embodiment
of the invention.
FIG. 4B is an enlarged detail view in cross section of a portion
of the structure of FIG. 4A as identified by a small circle in FIG.
4A connected by a line to FIG. 4B.
FIG. 4C is another enlarged detail view in cross section of another
portion of the structure of FIG. 4A as identified by another small
circle in FIG. 4A connected by a line to FIG. 4C.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Referring first to FIGS. 1-3 an elongated hollow cylinder 10 has
at the open end a first flange 12 extending at right angles to the
axis of the cylinder. The flange can be circular with two opposite
slots 14 or as shown in dotted line at 16 can be elongated and extend
in the direction shown. The opposite end of the cylinder as shown
18 can have means 20 adapted to detachably receive a hypodermic
needle.
A plunger 22 extends slidably into opening 24 of the open end of
the cylinder. The plunger is aligned with and centered on the axis
of the cylinder. The plunger has on the end which is disposed within
the cylinder a seal 26 whereby a liquid tight seal exists between
the piston and the cylinder. One end of the plunger is enlarged
and is always disposed outside the cylinder. This end designated
as a head is shown at 28.
When the first flange 12 and the head 28 are squeezed together,
as indicated in FIG. 3 by interconnected arrow headed lines 50
injection action ensues.
A second flange 30 extends at right angles to the cylinder and
has an opening through which the cylinder extends whereby the second
flange is slidable back and forth along the outer surface of the
cylinder in the axial direction. Two oppositely disposed axially
extending members or elements 32 are each secured at one end to
flange 30 and extend along the surface of the cylinder through slots
14 (if flange 12 is circular) or along the narrow sides of the flange
12 (if this flange is elongated) toward head 28.
When the second flange 30 and first flange 12 are squeezed together,
as indicated in FIG. 3 by interconnected arrow headed lines 52
aspiration action ensues.
The structure shown in FIGS. 4A, 4B and 4C functions in the same
manner as the structure in FIGS. 1-3 but is modified by substituting
a plunger 60 which itself is a hollow cylinder for the plunger 22
of FIGS. 1-3.
Plunger 60 has an outwardly extending lip 62 at its inner end which
is forced into cylinder 10 over an enlarged inner lip 64 in the
cylinder whereby the lip 62 forms the requisite seal. After aspiration
the plunger contains the aspirated fluid. The syring can then be
held vertically with the plunger disposed below the cylinder. The
plunger can then be pulled out of the cylinder and used as a vessel,
capped if necessary to transport the fluid for testing or other
purposes. |