Medical syringe abstract
Disposable medical syringe 10 consisting of a hollow syringe chamber
12 for receiving a piston 14 traversing a displaceable extendible
path 16 in the chamber, a rod 18 axially coupled to one end of
the piston 14 and at the other end to a thumb engaging surface
20 a stop member 22 in the hollow chamber 12 at a proximal end
and adjacent to the rod 18 for terminating one end of the displaceable
extendible path 16 a cap 30 securely but removably mounted at
a distal end of the hollow chamber from the one end and having a
tubular coupling 32 for receiving in frictional engagement a syringe
needle 34 a supporting body for axially centering support of the
needle within the hollow chamber and securely mounted to an inner
end of the needle 34 a distal end of the needle 34 adapted for
injection in a patient for serving to pass fluid received from the
hollow chamber to pass into the patient, an annular projection 38
disposed about the tubular coupling 32 for latch-engaging the distal
end of the needle therein, and a snap-socket fastener arrangement
50 consisting of one receiving-female portion 52 and one snap-fit-engaging
male portion 54 fastening thereto, either the one or the other
portions included on an end of the piston proximal the support body,
and the other of the one or the other portions included on an end
of the support body proximal the piston.
Medical syringe claims
What is claimed is:
1. A safely-disposable, singly-usable medical syringe comprising
a) a hollow chamber, having a first end and a second end;
b) a piston, within said chamber, for traversing a displaceable
extendible path in said chamber, having a first side facing the
first end of said chamber, having a second side facing the second
end of said chamber, where said second side of said piston further
includes a first portion of a snap-socket fastener arrangement facing
said second end of said chamber;
c) a rod, having a first end and a second end, where said first
end is axially coupled to the first side of said piston;
d) a thumb-engaging surface, coupled to the second end of said
rod;
e) a stop member, formed in the first end of said chamber and adjacent
to said rod for terminating one end of the displaceable extendible
path;
f) a substantially conical cap, removeably mounted to the second
end of said chamber, having a vent opening in said cap for allowing
said piston to traverse said chamber;
g) a hollow needle, having a first end and a second end, where
said second end is adapted for injecting a fluid into a patient;
h) a tubular coupling, mounted in said cap for receiving in frictional
engagement said needle along an axis;
i) an annular projection, within said chamber and tubularly coupled
to said tubular coupling; and
j) a support body, within said chamber, having a first side securely
mounted to the first end of said needle at a slight angular bias
to said needle axis, having a second side facing said second side
of said piston where said second side of said support body further
includes a second portion of said snap-socket fastener arrangement
which faces said first portion of said snap-socket fastener arrangement
so that when said first portion of said snap-socket fastener arrangement
is engaged with said second portion of said snap-socket fastener
arrangement and said needle is drawn into said chamber said slight
angular bias created by said support body causes said needle to
move from its axis and disengage from said annular projection thereby
trapping said needle within said hollow chamber.
2. The device of claim 1 wherein said snap-socket fastener arrangement
is comprised of an annular-cup receptor and an annular barb member.
3. The device of claim 2 wherein said needle is comprised of steel.
4. The device of claim 3 wherein said tubular coupling is magnetically
attractive to steel.
5. The device of claim 4 wherein said support body further includes
a tension spring which angularly biases said needle.
6. The device of claim 5 wherein said cap is removably mounted
to the second end of said chamber.
7. The device of claim 1 wherein said needle is comprised of steel.
8. The device of claim 7 wherein said tubular coupling is magnetically
attractive to steel.
9. The device of claim 1 wherein said support body further includes
a support body which angularly biases said needle.
10. The device of claim 1 wherein said cap is removably mounted
to the second end of said chamber.
Medical syringe description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a safely disposable, singly-usable medical
syringe 10 wherein, after its use for injecting serum or the like
into a patient by a doctor-technician or similar others using the
syringe, the needle 34 is automatically pressure interlocked and
connected to the syringe plunger 14 and withdrawn into the interior
body of the syringe 10 preventing any further and unintended and
unprofessional uses or unintended needle stick injuries. More particularly,
the invention is directed to a disposable medical syringe 10 consisting
of a hollow syringe chamber 12 for receiving a syringe plunger
or piston 14 which piston traverses a displaceable extendible path
16. Within the syringe chamber 12 a rod 18 is axially coupled
to one end of the piston 14 and at the other end is formed into
a thumb engaging surface pad 20. A stop member 22 is located in
the hollow chamber 12 at a proximal end and adjacent to the rod
18 which terminates one end of the displaceable extendible path
16. A cap 30 is securely but may be removably mounted at the distal
end of the hollow chamber 12. A tubular coupling 32 for receiving
in frictional engagement, the syringe needle 34 is formed within
the chamber 12 and attached to the supporting body 24 for axially
centering support of the needle within the hollow chamber and in
turn is securely mounted to an inner or proximal end of the needle
34 a distal end 40 of the needle 34 adapted for injection in
a patient for serving to pass the fluid to be injected 26 which
is then received from the hollow chamber 12 to pass thru the needle
34 into the patient, an annular projection 38 disposed about the
tubular coupling 32 to engage the distal end of the needle when
it is withdrawn into the chamber 12 and a snap-socket fastener
arrangement 50 consisting of one receiving-female portion 52 and
one snap-fit-engaging male portion 54 forming a pressure sensitive
fastening thereto. Either the one or the other portions 52 or 54
included on an end of the piston proximal the support body, and
the other remaining of the one or the other portions included on
an end of the support body 24 proximal the piston; and also the
method of the construction thereof.
The invention relates further to a method of making a disposable
singly usable medical syringe within the disclosure thereof as more
particularly described herein.
2. Description of the Prior Art
Various prior art safety medical syringes, and syringe needle disablers
and like systems, as well as apparatus and method of their construction
in general, are found to be known: and exemplary of the U.S. prior
art are the following:
______________________________________ Jennings 4650468 Braginetz
4883471 Braginetz 4888002 Magre 4932939 Straw 4985021 Dillard
5057086 Narayanan 5057088 Dyke 5059184 Gaarde 5064419 ______________________________________
Straw, Dillard and Dyke, disclose a complex spring-loaded sheathing,
to cover a used or contaminated needle.
Braginetz '471 describes a syringe that retracts the contaminated
needle into the syringe body through a careful alignment of a system
of vent holes.
Braginetz '002 as well as Jennings and Magre, disclose; a selectively
connected needle being withdrawn Into a body of the syringe after
use, and one requiring the use of two hands to operate the screw-type
engagement.
Straw, noted above shows a sleeve or sheath fitted to cover a contaminated
needle.
Narayanan, shows a movable sheath for the syringe needle.
Gaarde, describes a self-shielding syringe incorporating a spring
that thrusts the needle forceably back into a receiving cylinder
after the cylinder's covering membrane is punctured by the needle.
These patents or known prior uses teach and disclose various types
of medical syringes and the like of various sorts and of various
manufactures as well as methods of their construction, but none
of them whether taken singly or in combination disclose the specific
details of the combination of the invention, including but not limited
to the automatic needle withdrawing operation, in such a way, as
to bear upon the claims of the present invention.
SUMMARY OF THE INVENTION
An object, advantage and feature of the invention is to provide
a disposable, singly-usable medical syringe 10 wherein after its
use for injecting serum into a patient by a doctor-technician, the
needle 34 is automatically attached and withdrawn into and latched
in the interior body hollow chamber 12 of the syringe 10 for preventing
unintended and unprofessional uses and unintended needle sticking
injuries.
Another object of the invention is directed further to providing
a disposable medical syringe 10 comprising a hollow syringe chamber
12 for receiving a piston 14 traversing a displaceable extendible
path 16 in the chamber, a rod 18 axially coupled to one end of
the piston 14 and at the other end to a thumb engaging surface
20 which allows a one handed dual pressure operation a stop member
22 in the hollow chamber 12 at a proximal end and adjacent to
the rod 18 for limiting at one end the travel of the piston thru
the extent of the path 16 a substantially conical cap 30 formed
at a distal end of the hollow chamber and having a tubular coupling
32 member for receiving in frictional engagement a syringe needle
34 a surrounding supporting body 24 for axially centering support
of the needle within the hollow chamber and securely mounted to
an inner end of the needle 34 a distal end of the needle 34 adapted
to be slightly off axis angularly biased and adapted in a known
manner for fluid injection in order to pass fluid 26 received,
by a lesser pressure applied to the piston 14 from the hollow chamber
12 to then pass into the patient; an annular projection 38 disposed
about the tubular coupling 32 for engaging the withdrawn distal
end of the needle therein, as shown in FIG. 2 at alternate position
indicated by 32 a, a snap-socket fastener arrangement 50 consisting
of one receiving-female portion 52 and one snap-fit-engaging male
portion 54 automatically responsive to a greater pressure on piston
14 fastening thereto, either one or the other of the portions 52
or 54 included on an end of the piston proximal the support body,
and the other, of the one or the other portions, releasably included
on an end of the support body proximal the piston and fixedly attached
to the support body 24 and also the method of the construction
thereof.
Another object of the invention is to provide a method of making
an automatic, needle disposable, singly-usable medical syringe according
to the description of the apparatus as set forth.
These together with other objects and advantages which will become
subsequently apparent reside in the details of the process and operation
thereof as more fully hereinafter is described and claimed, reference
being had to the accompanying drawings forming a part hereof, wherein
like numerals refer to like parts throughout.
DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
FIG. 1 is an elevation view of a disposable and singly-usable medical
syringe and illustrating a typical installation of the system according
to a preferred embodiment and best mode of the present invention.
FIGS. 2 and 3 are cross sectional stylized views of a detail of
the disposable and singly-usable medical syringe of FIG. 1 showing
the needle withdrawn within the tubular body and also (FIG. 3 )with
a biased base to engage the needle to trap it in the annular projection
38.
DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION
Referring now to the drawings there is shown in the figure a disposable
medical syringe 10 consisting of a hollow syringe chamber 12 for
receiving a piston 14 traversing a displaceable extendible path
16 in the chamber.
A rod is 18 axially coupled to one end of the piston 14 and at
the other end to a thumb engaging surface 20 and a stop member 22
in the hollow chamber 12 is positioned at a proximal end and adjacent
to the rod 18 for terminating one end of the travel of the displaceable
extendible path 16.
A cap 30 is securely formed at a distal end of the hollow chamber
from the one end and having a tubular coupling 32 for receiving
in frictional engagement a syringe needle 34 and a supporting body
for axially centering support of the needle is positioned within
the hollow chamber and securably mounted to an inner end of the
needle 34.
A distal end 40 of the needle 34 is adapted for injection in
a patient for serving to pass fluid 26 received from the hollow
chamber to pass into the patient, an annular projection 38 disposed
about the tubular coupling 32 for engaging the distal end of the
needle when it is withdrawn into the body 12 in response to the
angular bias of the needle 34 therein.
The drawing shows the relative displacements of the piston and
directions for movement of the piston 14 for:
(1) readying the syringe for Intake of serum, by expelling the
air in the chamber 12 by making a "forward stroke" of
the plunger to make a place for the fluid or serum,
(2) to fill the cavity of the syringe with fluid or serum, when
the distal end of the needle is inserted in a fluid or serum, by
a "reverse stroke"
(3) dispensing by a second "forward stroke," with normal
pressure on the thumb engaging surface and Injecting the serum when
the distal end of the needle is disposed in a patient,
(4) the direction of displacing the piston 14 with extra pressure
on the thumb engaging surface to automatically access the latch
by the snap-socket fastener 50 and
(5) to withdraw the needle 34 and its surrounds 36 and 24 into
the chamber for the needle 34 having its bias freed to engage the
projection 38.
A snap-socket fastener arrangement 50 consisting of one receiving
female portion 52 and one snap-fit-engaging male portion 54 which
may be angularly skewed, and a pressure responsively automatically
matingly fastening thereto and withdrawing the needle 34 on an
angular bias as shown in FIG. 3. Either the one or the other of
said portions included on an end of the piston proximal the support
body, and the other of the one or the other portions included on
an end of the support body proximal the piston.
The projection 38 retains the distal end of the needle 34 by
means of a biasing tension spring 60 or like skewed barb engaging
member 62 FIG. 3 or by essentially equivalent means such as a
magnetized component in or integral with the projection 38 for
being attractive to material such as steel in the needle 34.
A vent hole 42 is opened in the hollow chamber 12 to allow the
joined male portion 52 and female portion 54 of the snap fastener
50 when joined to withdraw with the needle 34 its tubular coupling
36 and its supporting body 24 and plunger 14 all moving in unison
away from the cap portion 30 of the syringe 10. The snap fastener
50 may comprise an annular cup receptor 54 and an annular barb
member 52. Alternatively the projection 38 about the tubular coupling
32 is eccentrically magnetically attractive to the steel needle
or a tension spring 60 or a slight alignment bias of the tubular
coupling 36 at the base of the needle generally biases the distal
end of the needle, when released into the chamber 12 in to the annular
projection 38 to prevent any reuse or reextension of the needle
for improper or normal purposes.
The apparatus of the disposable medical syringe 10 of the invention
may be so constructed and arranged in its component parts that it
may be assembled as a kit or in kit form.
The foregoing is considered as illustrative only of the principles
of the invention. Further, since numerous modifications and changes
will readily occur to those skilled in the art, it is not desired
to limit the invention to the exact construction and operation shown
and described, and accordingly, all suitable modifications and equivalents
may be resorted to falling within the scope of the Invention.
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