Front loaded medical fluid syringe mounting
First Claim
1. A front-loading injector for injecting fluid from a syringe having a barrel, a closed forward end with a discharge opening therein, an open rearward end, and structure extending radially outward from and integrally included on the barrel, wherein the structure is located toward a rearward end of the barrel, the injector comprising:
- an injector housing having a front with an opening therein and an injection ram in the injector housing extendable along an axis of the ram through the opening to drive a plunger in a syringe mounted to the injector;
a member moveable relative to an axis between a retracted position and an engaged position in which the member engages the syringe forward of the structure on the syringe; and
a cam coupled to the member, the cam interacting with the structure on the syringe such that rotation of the syringe actuates the cam, the cam causing movement of the member upon cam actuation.
3 Assignments
0 Petitions
Accused Products
Abstract
Various sealing structures are used in a front-loading injector, for preventing leakage of spilled fluid from an external surface of a syringe into the vicinity of the drive ram. For example, a sealing gasket may be incorporated into the front face of the injector housing, for mating to the rearward circular edge of the cylindrical body of a syringe. Alternatively, sealing and locking functions may be performed by a single structure on the rearward end of the syringe. Further, leakage may be prevented by including a non-planar sealing flange on the syringe, positioned on the syringe forward of the locking structure, or by a two-piece structure, including a syringe and a separate leakage stopping washer for surrounding the syringe to halt the flow of fluid along the exterior of the syringe. As part of this aspect, or as an independent feature, the syringe may include an annularly discontinuous flange forward of the locking structure, for providing mechanical support for the syringe against the injector. Alternatively, an iris-like structure may be incorporated into the front surface of the injector, for closing about the syringe upon insertion of the syringe into the injector.
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Citations
31 Claims
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1. A front-loading injector for injecting fluid from a syringe having a barrel, a closed forward end with a discharge opening therein, an open rearward end, and structure extending radially outward from and integrally included on the barrel, wherein the structure is located toward a rearward end of the barrel, the injector comprising:
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an injector housing having a front with an opening therein and an injection ram in the injector housing extendable along an axis of the ram through the opening to drive a plunger in a syringe mounted to the injector; a member moveable relative to an axis between a retracted position and an engaged position in which the member engages the syringe forward of the structure on the syringe; and a cam coupled to the member, the cam interacting with the structure on the syringe such that rotation of the syringe actuates the cam, the cam causing movement of the member upon cam actuation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A medical fluid injection assembly comprising:
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an injector housing having an opening defined therein; a syringe that includes; a cylindrical barrel having an open rearward end, a closed forward end, a discharge opening defined in the closed forward end, and a structure projecting radially outward from an exterior of and located toward a rearward end of the barrel, wherein the structure is located within the injector housing; and a plunger disposed within and movable relative to the barrel; and a drive ram extendable along an axis thereof through the opening in the injector housing to drive the plunger of the syringe relative to the barrel of the syringe; a member that is moveable relative to the axis of the drive ram between; an engaged position in which the member engages the barrel of the syringe forward of the structure; and a retracted position in which the at least a portion of the barrel that includes the structure may be removed from within the injector housing; and a cam coupled to the member, wherein the cam interacts with the structure of the syringe such that rotation of the syringe actuates the cam, the cam causing movement of the member upon cam actuation. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification