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A medical syringe 2 includes a cylindrical syringe body 3 and a
plunger 4 fitted in the syringe body 3 for injecting a liquid agent
filled in the syringe body 3 from the syringe body 3 into the vascular
system of the human body by advancing the plunger 4 relative to
the syringe body 3. The plunger 4 comprising a plunger body 5 and
an elastic cover 9 fitted over the plunger body 5 from the front.
The plunger body 5 is provided with a backplate 62 at a rear end
thereof, the backplate 62 having an annular groove 68 forwardly
opened and formed in a front surface outer peripheral portion thereof.
The portion of the elastic cover 9 to be rearwardly stretched by
the advance of the plunger 4 is allowed to ingress into the annular
groove 68 for escape.
A medical syringe has a tubular body extending along an axis and
having a front end and a rear end, a plunger axially slidable in
the body and carrying a stem projecting axially rearward out of
the body from the plunger, and a free piston slidable in the body
forward of the plunger and subdividing the body forward of the plunger
into a front compartment at the front body end and a rear compartment
between the plunger and the piston. The body is formed with a bypass
passage forward of the piston in a starting position so the front
compartment can hold a soluble medicament and the rear compartment
can hold its solvent. Structure at the rear body end forms a radially
inwardly open angularly limited cutout and at least two axially
spaced, angularly offset, and radially outwardly projecting stop
bumps on the stem are axially displaceable through the cutout in
respective angularly offset positions of the stem. The stop bumps
are axially engageable against the structure except when the stem
is in the respective angular position. An elastically deformable
brake element engaged between the body and the stem for axially
slowing axial forward advance of the stem.
Telescoping leakproof two-piece medical syringe container. An upper
tubular member or "cap" closed at its top end is wide
enough along its vertical extent and downward to surround a syringe
plunger, and also extends laterally from near its open lower end
outward and downward to that end, so as to surround a finger grip
of a syringe. A lower tubular member or "body" closed
at its bottom end is wide enough along its vertical extent and upward
to surround a syringe barrel with optional attached needle, and
also extends laterally, from near its open upper end outward and
upward to that end, so as to surround the syringe finger grip. The
cap member and the body member telescope snugly together, and are
retained against accidental opening by one or more detents on the
open end of one of the tubular members overlapping the end of the
other tubular member. At least one open end is tapered relative
to the other open end to ensure that a leakproof container results
when telescoped together.
The invention concerns a medical syringe comprising a tubular body,
in which slides a plunger comprising an opening, the plunger comprising
a sealing piece, movable in the plunger and which closes the opening
of the syringe before it is used. The assembly is arranged such
that, after the syringe has been used, the sealing piece no longer
closes the opening permanently, so that the syringe cannot be used
again. All the parts of the syringe are designed for being produced
by moulding and automatically mounted in series by axial jointing.
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