Syringe barrel with reinforcing rib
View Patent ↗Since this syringe has projections provided on the rear surface of a flange of a syringe barrel, when it is inserted in an insertion groove of a cylinder holder, the tips of projections are compressed and the flange is fixed. Consequently, even when a solution having high viscosity is injected at higher pressure, breakage does not occur easily. Further, pressure-receiving area may also be increased by providing a guide defining mounting direction of a syringe, alternatively, a positioning mechanism may be provided so as to obtain mounting at a correct position, or the surface of a flange may be roughened.
1. A syringe barrel for an injection apparatus, the syringe barrel being adapted to be mounted on a cylinder holder that comprises a flange insertion groove, the syringe barrel comprising:
a flange adapted to be held by said flange insertion groove so as to fix the syringe barrel; and
a reinforcing rib comprising a concentric reinforcement and a plurality of radial reinforcements, said reinforcing rib being provided on a rear surface of the flange, wherein the radial reinforcements are positioned around the concentric reinforcement, and wherein the radial reinforcements taper in height towards an outside of the flange.
2. A syringe barrel according to claim 1 , wherein the rib has a concave portion which is adapted to fit a positioning mechanism installed in the cylinder holder.
3. A syringe barrel according to claim 2 , wherein the positioning mechanism is a latch pushed by a coil spring.
4. A syringe barrel according to claim 2 , wherein the positioning mechanism is a blade spring having a pawl.
5. A syringe barrel according to claim 1 , wherein the rib and the flange together are adapted to be inserted in a flange holding groove.
6. A syringe barrel according to claim 1 , wherein the rib has a height of about 0.2 to about 3 times the thickness of the flange.
7. A syringe barrel according to claim 1 , comprising a double flange.
8. A pre-filled syringe, comprising:
a syringe comprising a syringe barrel of one of claims 1 to 4 and 7 ; and a chemical solution filled in the syringe.