Medical syringe abstract
Medical care device for only one-time use as a medical syringe
for injection with destroyable piston after single use. Destruction
of a syringe piston will occur after one-time use by cutting out
a hole in the center of the front wall of the piston. In the very
last moment of the injection stroke, the piston is pushed against
the very sharp cylindrical cutting edge of the rear end of the tubular
needle, which protrudes to the inside of the syringe cylinder for
this purpose. With such a punctured piston it will be impossible
to create a vacuum suction effect which is necessary to introduce
any medication or liquid into the syringe cylinder for a second
use. Simply put, nobody will be able to use this kind of syringe
twice.
Medical syringe claims
I claim:
1. A medical injection syringe comprising:
a cylinder having an open end and a closed end and a cutting edge
protruding into the interior of the cylinder at the closed end;
a hollow needle mounted in the closed end of the cylinder in communication
with the interior of the cylinder;
a piston adapted to fit in the interior of the cylinder through
the open end thereof and in sealing engagement with the cylinder
for forcing fluid through the needle as the piston is pushed towards
the closed end of the cylinder, the piston having a piston surface
facing the cutting edge as the piston approaches the closed end
of the cylinder;
means surrounding the cutting edge for protecting the piston surface
from being cut when the piston approaches the closed end of the
cylinder; and
pushing means for forcing the piston toward the closed end of the
cylinder so as to force the fluid out the needle and such that when
the piston engages the cutting edge, an opening hole is cut in the
piston surface.
2. The syringe as set forth in claim 1 wherein the cutting edge
is formed on the needle at an end in communication with the interior
of the cylinder.
3. The syringe as set forth in claim 1 wherein the piston is made
of silicone rubber and the pushing means includes a support surface
behind the piston surface as the piston nears the closed end of
the cylinder so that the piston surface is supported when the cutting
edge cuts an opening hole.
4. The syringe as set forth in claim 3 wherein the protecting means
has a circularly shaped opening into which the cutting edge can
protrude and the cutting edge is cylindrically shaped such that
the opening hole cut in the piston surface is substantially circular.
5. The syringe as set forth in claim 4 wherein the support surface
includes a disc shaped member.
6. The syringe as set forth in claim 1 wherein the pushing means
has an opening extending from a side near the piston to an outlet
side toward the open end of the cylinder such that when the opening
hole is cut air easily passes freely from the closed end of the
cylinder to the open end.
7. The syringe as set forth in claim 6 wherein the cutting edge
is cylindrically shaped and the opening is cylindrically shaped
smaller in diameter than the cutting edge.
8. A medical injection syringe comprising:
a cylinder having an open end and a closed end and a cutting edge
protruding into the interior of the cylinder at the closed end;
a hollow needle mounted in the closed end of the cylinder in communication
with the interior of the cylinder;
a piston adapted to fit in the interior of the cylinder through
the open end thereof and in sealing engagement with the cylinder
for forcing fluid through the needle as the piston is pushed towards
the closed end of the cylinder, the piston having a cavity formed
in the piston surface facing the cutting edge into which the cutting
edge protrudes as the piston approaches the closed end of the cylinder;
and
pushing means for forcing the piston toward the closed end of the
cylinder so as to force the fluid out the needle and such that when
the piston engages the cutting edge, an opening hole is cut in the
piston within the cavity formed therein.
9. The syringe as set forth in claim 8 wherein the cutting edge
is formed on the needle at an end in communication with the interior
of the cylinder.
10. The syringe as set forth in claim 8 wherein the piston is made
of silicone rubber and the pushing means includes a support surface
behind the cavity as the piston nears the closed end of the cylinder
so that the cavity is supported when the cutting edge cuts an opening
hole.
11. The syringe as set forth in claim 10 wherein the cavity is
cylindrically shaped and the cutting edge is cylindrically shaped
such that the opening hole cut in the cavity is substantially circular.
12. The syringe as set forth in claim 11 wherein the support surface
includes a disc shaped member.
13. The syringe as set forth in claim 8 wherein the pushing means
has an opening extending from a side near the piston to an outlet
side toward the open end of the cylinder such that when the opening
hole is cut air easily passes freely from the closed end of the
cylinder to the open end.
14. The syringe as set forth in claim 13 wherein the cutting edge
is cylindrically shaped and the opening is cylindrically shaped
smaller in diameter than the cutting edge.
Medical syringe description
FIELD OF THE INVENTION
The present Invention generally relates to medical devices and
its main function is to provide health care and medical care in
such a safe manner which will eliminate any possible mistakes, misuse,
use not related to medical use, and eliminate the possibility of
infecting the patient or any other person by re-use.
DESCRIPTION OF THE PRIOR ART
In recent years, there has been a substantial increase in the use
of individually sterilized, individually packaged so-called one-time
use medical syringes. They gained popularity and the appreciation
of medical personnel and also generally decreased the possibility
of infecting an injected patient with germs or viruses that sometimes
survived the sterilization process, a situation which occurred when
multiple use syringes were sterilized after each use.
So-called one-time use medical syringes, presently dominating today's
market, also have many other well-known advantages and disadvantages.
The greatest disadvantage is that none of the presently used medical
syringes, mistakenly called one-time use syringes, has the capability
of destroying itself after a single use in an absolutely safe and
sure manner so that they may not be mistakenly re-used by medical
personnel or intentionally by others including non-professional
persons or narcotics users.
In reality, mistakenly called one-time use syringes may be repeatedly
used, beyond the control of medical personnel thus creating grave
danger for people.
The present Invention does not have these disadvantages and its
presented embodiment surely is adequate to the title--"The
One-Time Use Medical Syringe for Injection with Destroyable Piston
after Single Use". Nobody will be able to use it twice.
SUMMARY OF THE PRESENT INVENTION
The object of the present Invention called "The One-Time Use
Medical Syringe for Injection with Destroyable Piston after Single
Use" is a medical device for very wide medical care treatment.
The One-Time Use Medical Syringe for Injection with Destroyable
Piston after Single Use, will be usable one time, and will not be
able to be used twice. In order to achieve this effect, the tubular
needle rear end of a syringe will protrude to the inside of a syringe
cylinder, and will have a very sharp cylindrical cutting edge. Nearing
the end of the injection stroke, an opening hole in the center of
the working surface of a specially formed flexible piston will automatically
be cut out by the cutting edge which will protrude inside the syringe
cylinder. It will be impossible to create a vacuum suction effect
with such a punctured piston for introducing any other medication
or liquid into the syringe cylinder for second time use.
The Invention consists of several novel features which are hereinafter
set forth and are particularly defined by claims at the conclusion
hereof.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1--is the enlarged cross section through the syringe in a
ready to use condition.
FIG. 2--is the enlarged partial cross section of the needle and
syringe cylinder attachment.
FIG. 3--is the enlarged partial cross section of the piston and
syringe pushing rod attachment.
FIG. 4--is the enlarged partial cross section the syringe showing
the piston and cylinder after an opening hole has been punctured
in the piston .
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to the drawings, and more particularly to FIG 1
and in more enlarged detail in FIG. 2 and FIG. 3 the preferred
embodiment of the present invention consists of circular syringe
cylinder 10 which has the specially formed tubelike needle 14 molded
into front section 12 of the syringe cylinder 10. Needle 14 has
a specially sharpened front end 16 for easy penetration of the skin
or muscles. The rear end of needle 14 has been formed by expanding
or flaring the needle tube material, or otherwise attaching a slightly
bigger tube having a very sharp cylindrical cutting edge 18 which
protrudes inside of syringe cylinder 10. Needle 14 in the portion
being molded inside front section 12 of cylinder 10 also has a
small flange 20 which will secure needle 14 in the front end of
cylindrical syringe body 10 firmly, and will protect needle 14 against
being pulled out of its joint.
To assure a leak free joint of needle 14 to the front end of cylinder
12 needle 14 may also be additionally covered with a thin layer
of special resin glue 22 which will seal this joint completely.
At the rear end of cylinder 10 is formed a rectangular flange 24
and chamfered inner surface 26 to facilitate the movement of a piston
generally designated 28 inside cylinder 10.
FIG 3 shows a new type of flexible piston 28 which is attached
by snapping it on front end 32 of pushing rod 30. Piston 28 has
front end 34 shaped similar to the front end of the inner cylindrical
surface of syringe cylinder 10.
The sharp cylindrical cutting edge 18 of needle 14 protrudes inside
of syringe cylindrical body 10 and will be shielded and protected
inside concave cavity 36 of piston 28.
Bottom wall 38 of piston cavity 36 has enough thickness to allow
cutting an opening through it easily when piston 28 is pushed further
against sharp cylindrical edge 18 of needle 14. A front disc 40
included in rod 30 has a front flat surface which provides a cutting
support surface for the edge 18 at the end of the injection stroke.
Flexible piston material will deform when an opening hole 60 in
bottom wall 38 is cut by edge 18 against disc 40 in order to destroy
the piston.
To help the piston material deform at the time the opening is cut,
small take offs 42 and 44 are formed on the outside of piston body
28 adjacent two sealing rings 46 and 48 which are slightly bigger
than the inside diameter of syringe cylinder 10.
During the injection stroke of piston 28 the conical shape of
front disc 40 tends to expand the piston material to the outside,
and by doing that, increase the sealing effect between piston 28
and syringe cylinder 10. Attachment of piston 28 to syringe push
rod 30 is accomplished by forcibly introducing front end 32 of pushing
rod 30 into inner chamber 50 of piston body 28.
In the center of the flat surface of front disc 40 there is cylindrical
opening 52 slightly smaller than sharp cylindrical cutting edge
18 on needle 14 to allow the unobstructed flow of air through piston
28 from and to inner chamber 50 after the center opening hole 60
in piston bottom wall 38 is cut out, as illustrated by arrows representing
flowing air in FIG 4.
On the outside of front end 32 of pushing rod 30 at least four
reinforcing ribs 54 are formed around which piston body 28 also
will be centered.
A flat circular disc 56 is located on top of the rear end of pushing
rod 30 and is where the pushing force of the thumb is applied. Guiding
ribs 58 are formed on the outside of the reduced cylindrical portion
of the front end of syringe cylinder 10 and allow a protective
cover for tubular needle 14 to snap on and be positioned and secured
to the cylinder 10.
For the purpose of clarity the above mentioned protective cover
is not shown in the drawing. It is also not illustrated on the drawings
since it is obvious that on the outside surface of syringe cylinder
10 there will be an appropriate scale permanently marked showing
the capacity of inner cylinder 10 and by that, allowing control
of the amount of the medication being introduced inside syringe
cylinder 10.
It will be apparent that various small changes may be made in the
form of each component thereof without departing from the spirit
and scope of the present invention. |