Coupling system for an infusion pump
First Claim
1. A liquid delivery system comprising:
- a housing which accommodates a syringe containing the liquid;
means for expelling a liquid from the syringe carried by the housing;
a cap which selectively connects the syringe with the housing and provides a fluid passage between the syringe and a fluid line when the fluid line is connected with the cap, the cap including means for selectively connecting the cap with the syringe;
at least two spaced projections on one of the cap and the housing; and
at least two spaced slots on the other of the cap and the housing which receive the projections, such that when the projections are positioned in the slots, the cap is moved relative to the housing in a locking direction to lock the cap to the housing.
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Accused Products
Abstract
A pump system for an infusion system includes a linear drive (36, 36′) which minimizes the space occupied by the pump components in a portable housing (10, 10′). A motor (34) and a motor drive shaft (42) are arranged in parallel with, and adjacent to a syringe (14, 14′) and lead screw (94, 94′). A gear box (54) connects the drive shaft and lead screw to transfer rotational movements between them. A piston driving member, such as a drive nut (116) converts the rotational movement of the lead screw into linear motion of a syringe piston (24). A cap (190, 190′) couples the syringe (14, 14′) to the housing and provides an outlet for the liquid to be dispensed. In one embodiment, the cap (190′) is configured to rotate relative to the housing in one direction only, during locking. Rotational movement is also used for locking the piston (24) to the drive nut (116) against relative axial movement. In another embodiment, the cap (190′) carries a rotatable hub (330) which is connected at a first end (336) with an infusion line (191) and at a second end defines a needle (338) for piercing a closure (340) on the syringe.
177 Citations
30 Claims
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1. A liquid delivery system comprising:
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a housing which accommodates a syringe containing the liquid;
means for expelling a liquid from the syringe carried by the housing;
a cap which selectively connects the syringe with the housing and provides a fluid passage between the syringe and a fluid line when the fluid line is connected with the cap, the cap including means for selectively connecting the cap with the syringe;
at least two spaced projections on one of the cap and the housing; and
at least two spaced slots on the other of the cap and the housing which receive the projections, such that when the projections are positioned in the slots, the cap is moved relative to the housing in a locking direction to lock the cap to the housing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A liquid delivery system comprising:
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a housing which accommodates a syringe containing the liquid;
means for expelling a liquid from the syringe carried by the housing;
a cap assembly which selectively connects the syringe with a fluid line, the cap assembly including a cap for connecting the cap assembly with the syringe and a rotatable hub which provides a fluid passage between the syringe and the fluid line. - View Dependent Claims (23, 24, 25)
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26. A cap assembly for connecting a syringe to an infusion line, the cap assembly comprising:
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a threaded cap for selective interconnection with an outlet port of an associated syringe; and
a rotatable hub which rotates relative to an axis of the cap and is configured at a first end for connection with an infusion line or is integrally formed therewith, a second end of the rotatable hub being received through an opening in the cap and defining a needle for piercing a closure on the associated syringe.
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27. A method of assembling an infusion system comprising:
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coupling a cassette, containing a liquid to be infused, to a cap;
mounting the cap on a housing such that the cassette is received within the housing, the mounting step including;
engaging first and second projections on one of the cap and the housing with first and second slots on the other of the cap and the housing, the projections being configured such that the first projection is received only in the first slot;
rotating the cap relative to the housing in a locking direction to lock the cap to the housing. - View Dependent Claims (28, 29, 30)
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Specification