Collapsible syringe for fluid delivery system
A collapsible syringe assembly for a fluid delivery system is a multi-component device that includes a cylindrical pressure jacket and a collapsible syringe that is received within the pressure jacket. The collapsible syringe includes a cap member and a compressible or deformable sidewall member. The collapsible syringe in one embodiment is adapted to be secured to the pressure jacket by the cap member. The cap member is formed with a discharge port, which may be formed as conventional luer fitting. The discharge port is disposed coaxially within an annular wall on the outward facing side of the cap member and may be recessed within the annular wall.
1. A collapsible syringe for a fluid delivery system, the collapsible syringe comprising:
a distal end having a discharge port;
a proximal end portion having a closed end wall configured for engagement with a piston element of an injector; and
a compressible or deformable sidewall between the distal end and the proximal end portion,
wherein the sidewall is sufficiently rigid to be self-supporting when placed on end and pliable enough to permit the closed end wall to invert into an interior of the collapsible syringe so that the sidewall folds inward against itself when an axial force is applied to the closed end wall,
wherein the proximal end portion has a receiving end pocket configured for receiving a piston head of the piston element, and
wherein the receiving end pocket has at least one internal structure configured for engaging at least one retractable retaining pin on the piston head.
2. The collapsible syringe of claim 1 , wherein the compressible or deformable sidewall is a rolling diaphragm member.
3. The collapsible syringe of claim 1 , wherein the closed end wall includes a rigid end part, a rigid end base, or a rigid end plate in the receiving end pocket for receiving the piston head of the piston element.
4. The collapsible syringe of claim 3 , wherein the rigid end part, the rigid end base, or the rigid end plate is molded or adhered to the closed end wall.
5. The collapsible syringe of claim 1 , wherein the compressible or deformable sidewall is configured to overlap radially outward of a circumferential edge of a rigid end part, a rigid end base, or a rigid end plate of the closed end wall as the piston element is moved distally or forward into the collapsible syringe and the compressible or deformable sidewall rolls inward against itself.
6. The collapsible syringe of claim 1 , wherein the collapsible syringe is initially in a collapsed state where the closed end wall is toward the distal end of the collapsible syringe and the compressible or deformable sidewall of the collapsible syringe is rolled inward against itself.
7. The collapsible syringe of claim 1 , wherein the distal end is a rupture-ready distal end.
8. The collapsible syringe of claim 1 , wherein the distal end further comprises a leer-type fluid connector fitting on the discharge port.
9. The collapsible syringe of claim 8 , wherein the luer-type fluid connector fitting is surrounded by an annular body.
10. The collapsible syringe of claim 9 , wherein the annular body has an annular slot on an inner surface thereof, and wherein an annular portion of the discharge port is engaged within the annular slot.
11. The collapsible syringe of claim 1 , wherein the collapsible syringe is made by a blow molding process.
12. The collapsible syringe of claim 11 , wherein the blow-molding process is a process selected from the group consisting of a blow-mold-seal process, an injection-blow molding process, and an injection stretch-blow-molding process.