U.S. patent number 3,598,120 [Application Number 05/041,750] was granted by the patent office on 1971-08-10 for syringe having limited plunger movement.
This patent grant is currently assigned to Haematronics, Inc.. Invention is credited to Morris Mass.
United States Patent |
3,598,120 |
Mass |
August 10, 1971 |
SYRINGE HAVING LIMITED PLUNGER MOVEMENT
Abstract
The present invention includes a syringe having a plunger
movably mounted in a hollow barrel for reciprocal movement therein
in directions along its axis. A flexible elongated member has a
maximum length when stretched taut and has one end affixed to the
barrel and an opposite end affixed to the plunger in a manner
whereby when the plunger is moved a determined distance in a
predetermined direction the flexible member is stretched taut and
limits further movement of the plunger in the predetermined
direction. A cooperating guide device of the barrel and plunger
guides the plunger in a manner which prevents it from rotation
about its axis.
Inventors: |
Mass; Morris (Kew Gardens,
NY) |
Assignee: |
Haematronics, Inc. (New
Rochelle, NY)
|
Family
ID: |
21918135 |
Appl.
No.: |
05/041,750 |
Filed: |
June 2, 1970 |
Related U.S. Patent Documents
|
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
|
680172 |
Nov 2, 1967 |
|
|
|
|
Current U.S.
Class: |
604/208;
604/220 |
Current CPC
Class: |
A61M
5/31591 (20130101); A61M 5/31501 (20130101); A61M
5/3158 (20130101) |
Current International
Class: |
A61M
5/315 (20060101); A61m 005/22 () |
Field of
Search: |
;128/215,218,220,234--238 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
5,992 |
|
1895 |
|
GB |
|
529,263 |
|
Sep 1921 |
|
FR |
|
Primary Examiner: Truluck; Dalton L.
Parent Case Text
This application is a continuation of Ser. No. 680,172 filed Nov.
2, 1967, now abandoned.
Claims
What I claim is:
1. A syringe comprising a hollow barrel; a plunger having an axis
movably mounted in said barrel for reciprocal movement therein in
directions along its axis; and a flexible elongated member having a
maximum length when stretched taut and having one end affixed to
said barrel and an opposite end affixed to said plunger in a manner
whereby when said plunger is moved a determined distance in a
predetermined direction said flexible member is stretched taut and
limits further movement of said plunger in said predetermined
direction, said barrel having an axis, a forward end portion for
accommodating a hypodermic needle, a rearward open end portion
through which said plunger extends from said barrel and a middle
portion between said forward and rearward end portions, said barrel
including a notch formed in the rearward end thereof and said
plunger including a key protrusion extending parallel to its axis
and slidably seated in and guided by said notch in a manner whereby
said plunger is prevented from rotation about its axis.
2. A syringe as claimed in claim 1, wherein said flexible member
comprises a stringlike member.
3. A syringe as claimed in claim 1, further comprising a handle
extending from said plunger at the free end thereof substantially
perpendicularly to the axis of said plunger.
4. A syringe as claimed in claim 3, wherein said one end of said
flexible member is affixed to said flange and said opposite end of
said flexible member is affixed to said handle.
5. A syringe comprising a hollow barrel having an axis, a forward
end portion for accommodating a hypodermic needle, said forward end
portion including a first conical portion terminating in a second
truncated hollow conical portion having an axis of symmetry
coincident with the axis of said barrel, a rearward open end
portion having a protuberance extending toward said axis and a
notch formed in said protuberance and a middle portion between said
forward and rearward end portions and integral with and
communicating with said second conical portion; a flange extending
from said barrel at the rearward end portion thereof substantially
perpendicularly to the axis of said barrel, said flange having a
substantially ovular surface coaxial with but at a slight angle of
inclination with a plane perpendicular to the axis of said barrel
and a collar extending substantially perpendicularly from said
ovular surface at the periphery thereof to provide a rearwardly
opening recess with said ovular surface, the ovular surface of said
flange having a hole formed therethrough; a plunger having an axis
movably mounted in said barrel for reciprocal movement therein in
directions along its axis and extending from said barrel at the
rearward end portion thereof, said plunger having a cross section
of cross-shaped configuration comprising an elongated stem portion
of substantially narrow rectangular cross section and an elongated
branch portion of substantially narrow rectangular cross section
intersecting said stem portion at substantially right angles to
provide a pair of arms of the same dimensions positioned one on
each side of said stem portion in the manner of a cross, said
plunger having a forward end and a rearward end, a piston head
removably mounted on the forward end of said plunger and being
resilient in radial directions from the axis of said plunger, said
piston head being in frictional engagement with the inside surface
of said barrel in a manner whereby fluid in said barrel in the path
of said piston head is forced by said piston head in the direction
of movement of said piston head, the stem portion of said plunger
being slidably seated in and guided by the notch in the rearward
portion of said barrel in a manner whereby said plunger is
prevented from rotation about its axis; a substantially disclike
handle extending from said plunger at the rearward end thereof
substantially perpendicularly to the axis of said plunger, said
handle being substantially symmetrical with said plunger and having
a hole formed therethrough; and a flexible elongated member having
a maximum length when stretched taut and having one end passing
through the hole formed through the surface of said flange and
secured therein and an opposite end passing through the hole formed
through said handle and secured therein whereby when said plunger
is moved a determined distance in a rearward direction said
flexible member is stretched taut and limits further movement of
said plunger in said rearward direction.
6. A syringe comprising a hollow barrel, a plunger mounted for
reciprocal movement in said barrel along the longitudinal axis
thereof, a flexible elongated member having a maximum length when
stretched taut and having one end affixed to said barrel and an
opposite end affixed to said plunger in a manner whereby when said
plunger is moved a determined distance in a predetermined direction
said flexible member is stretched taut and limits further movement
of said plunger in said predetermined direction, a groove formed in
the inner surface of said hollow barrel, a key on an exterior
surface of said plunger slidably movable in said groove whereby
said plunger is prevented from rotation about its longitudinal
axis.
Description
The present invention relates to a syringe having limited plunger
movement. More particularly, the invention relates to a disposable
syringe for charging and discharging a constant volume of
fluid.
A principal object of the present invention is to provide a new and
improved syringe. The syringe of the present invention has a
limited plunger movement which provides charging and discharging of
a constant volume of fluid. The syringe of the present invention is
disposable. The syringe of the present invention automatically
provides and indicates the charging and discharging of a constant
volume of fluid without continuous supervision of the user. The
syringe of the present invention has a plunger which is prevented
from rotating about its axis. The syringe of the present invention
is of simple structure and is inexpensive to manufacture. The
syringe of the present invention is very easy to use and functions
with efficiency, effectiveness, accuracy and reliability.
In accordance with the present invention, a syringe comprises a
hollow barrel and a plunger, having an axis, movably mounted in the
barrel for reciprocal movement therein in directions along its
axis. A flexible elongated member has a maximum length when
stretched taut and has one end affixed to the barrel and an
opposite end affixed to the plunger in a manner whereby when the
plunger is moved a determined distance in a predetermined direction
the flexible member is stretched taut and limits further movement
of the plunger in the predetermined direction.
The flexible member is a fiber or stringlike member. The barrel has
an axis, a forward end portion for accommodating a hypodermic
needle, a rearward open end portion through which the plunger
extends from the barrel and a middle portion between the forward
and rearward end portions. A flange extends from the barrel at the
rearward end portion thereof substantially perpendicularly to the
axis of the barrel. The barrel includes a notch formed in the
rearward end thereof and the plunger includes a key protrusion
extending parallel to its axis and slidably seated in and guided by
the notch in a manner whereby the plunger is prevented from
rotating about its axis.
A handle extends from the plunger at the free end thereof
substantially perpendicularly to the axis of the plunger. One end
of the flexible member is affixed to the flange and the opposite
end of the flexible member is affixed to the handle.
In order that the present invention may be readily carried into
effect, it will now be described with reference to the accompanying
drawing, wherein similar components are identified by the same
reference numerals.
FIG. 1 is a perspective view of an embodiment of the syringe of the
present invention;
FIG. 2 is a side view of the embodiment of FIG. 1;
FIG. 3 is a partially fragmented rear view, taken along the lines
III-III of FIG. 2; and
FIG. 4 is a partially fragmented view, taken along the lines IV-IV
of FIG. 3.
The syringe of the present invention comprises a hollow barrel 11
having an axis 12 (FIG. 2). The barrel 11 has a forward end portion
13 for accommodating a hypodermic needle 14 (shown in broken lines
in FIG. 1). The forward end portion 13 includes a first conical
portion 15. The first conical portion 15 terminates in a second
truncated hollow conical portion 16 which has an axis of symmetry
coincident with the axis 14 of the barrel 11.
The barrel 11 has a rearward open end portion 17 having a
protuberance 18 (FIGS. 3 and 4) extending toward the axis 14 of
said barrel. The protuberance 18 has a notch 19 (FIG. 3) formed
therein. The barrel 11 also has a middle portion 21 between the
forward end portion 13 and the rearward end portion 17. The middle
portion 21 of the barrel 11 is integral with and communicates with
the second conical portion 16.
A flange 22 extends from the barrel 11 at the rearward end portion
17 substantially perpendicularly to the axis 12 of said barrel. The
flange 22 may be integrally formed with the barrel 11. The flange
22 has a substantially ovular surface 23 (FIGS. 2 and 4) coaxial
with, but at a slight angle of inclination with a plane
perpendicular to the axis 12 of the barrel 11. A collar 24 (FIGS. 2
and 4) extends substantially perpendicularly from the ovular
surface 23 at the periphery 25 (FIGS. 1 and 3) thereof to provide a
rearwardly opening recess 26 (FIGS. 2 and 4) with said ovular
surface. The ovular surface 23 has a hole 27 (FIG. 4) formed
therethrough.
A plunger 28 has an axis 29 (FIG. 4) and is movably mounted in the
barrel 11 for reciprocal movement therein in directions along said
axis. The plunger 28 extends from the barrel 11 at the rearward end
portion 17 thereof. The plunger 28 has a cross section of
cross-shaped configuration (FIG. 3) comprising an elongated stem
portion 30 of substantially narrow rectangular cross section and an
elongated branch portion 31 of substantially narrow rectangular
cross section.
The branch portion 31 of the plunger 28 intersects the stem portion
30 thereof at substantially right angles (FIG. 3) to provide a pair
of arms of the same dimensions positioned one on each side of said
stem portion in the manner of a cross. The plunger 28 has a forward
end 32 (FIG. 2) and a rearward end 33 (FIGS. 2 and 4).
A piston head 34 (FIG. 2) is removably mounted on the forward end
32 of the plunger 28. The piston head 34 is resilient in radial
directions from the axis 29 of the plunger 28 and is in frictional
engagement with the inside surface of the barrel 11 in a manner
whereby fluid in said barrel in the path of said piston head is
forced by said piston head in the direction of movement of said
piston head.
The stem portion 30 of the plunger 28 is slidably seated in and
guided by the notch 19 (FIG. 3) in the rearward portion 17 of the
barrel 11 in a manner whereby said plunger is prevented from
rotation about its axis 29.
A substantially disclike handle 35 extends from the plunger 28 at
the rearward end 33 thereof substantially perpendicularly to the
axis 29 of said plunger. The handle 35 may be integrally formed
with the plunger 28. The handle 35 is substantially symmetrical
with the plunger 28. The handle 35 has a hole 36 (FIG. 4) formed
therethrough.
A flexible elongated stringlike member 37 has a maximum length when
stretched taut and may comprise string of natural or artificial
fiber, wire, plastic, or the like. The flexible member 37 has one
end 38 passing through the hole 27 formed through the surface 23 of
the flange 22 and secured therein by any suitable means such as,
for example, bonding, knotting, crimping, tying, cross pin, or the
like. The flexible member 37 has an opposite end 39 passing through
the hole 36 formed through the handle 35 and secured therein by any
suitable means such as, for example, bonding, knotting, crimping,
tying, cross pin, or the like.
As shown in FIG. 2, when the plunger 28 is in any intermediate
position in the barrel 11, the flexible member 37 is in nontaut
condition and does not affect the position of said plunger relative
to said barrel. When the plunger 28 is moved a determined distance
in a rearward direction in the barrel 11, however, the flexible
member 37 is stretched taut and limits further movement of said
plunger in the rearward direction. Since the determined distance is
in accordance with the length, from end 38 to end 39, of the
flexible member 37, said length may be varied to vary the limit of
rearward movement of the plunger 28 thereby correspondingly
limiting the volume of fluid charged and discharged by the syringe.
The volume of fluid charged and discharged by the syringe of the
present invention is constant, due to the limiting of the rearward
movement of the plunger 28 by the flexible member 37.
While the invention has been described by means of a specific
example and in a specific embodiment, I do not wish to be limited
thereto, for obvious modifications will occur to those skilled in
the art without departing from the spirit and scope of the
invention.
* * * * *