Medical infusion pumps

Details Medical infusion pumps Medical infusion pumps

1996-07-01

1998-05-26

Rimell, Sam

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604131, 417474, A61M 3700

Patent

active

057556911

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to medical infusion pumps and more particularly to two-part medical infusion pumps comprising a first part incorporating a pump mechanism and control systems, and a second part, intended for detachable mounting upon the first part, incorporating a fluid cassette and a fluid delivery tube for fluid contained within the cassette.
The second part, incorporating the fluid cassette and delivery tube may, but need not be, a disposable item.
A positive, locking engagement between the first and second parts of the infusion pump is necessary, to ensure that the delivery tube of any second part fitted to the first part, is properly positioned for engagement by the pump mechanism of the first part, in order to ensure accurate, repeatable and controllable delivery of infusion fluid from the cassette via the delivery tube.
FR 2, 623,529 (Celsa) shows a two-part medical infusion pump according to Prior art. The part containing the fluid and fluid delivery tube has to be aligned into engagement with the part containing the pump mechanism by hand, and a support for the fluid delivery tube must also be subsequently located and secured manually.
The present invention provides an improved positioning and retaining means for the delivery tube of a two-part medical infusion pump incorporating such means, in which the delivery tube is carried by the second part, and the tube support means by the first part, of said two-part infusion pump.
The invention will be described with reference to the specific embodiment shown in the accompanying drawings of which:
FIGS. 1, 3, 5 and 7 show, respectively, in perspective, the first and second parts of a two-part medical infusion pump steps in progressive steps of engagement;
FIGS. 2, 4 6, and 8 show corresponding diagrammatic end-elevation views of the operative elements of the two parts at each step; and FIG. 9 shows another embodiment.
Referring to the drawings, a two-part medical infusion pump comprises a first part 10 incorporating a pump mechanism and control systems, and a second part 12 containing a fluid cassette (not separately shown) and a flexible delivery tube, shown in part and diagrammatically as 14, connecting the fluid cassette to a patient for delivery of the infusate.
To deliver infusate to a patient it is necessary to introduce into, and correctly support the delivery tube 14 within, part 10 containing the pump mechanism, which may be of one of a number of types, operating to displace accurate volumes of infusate from the cassette by successive compressions of the delivery tube 14.
The introduction and support of the delivery tube 14, together with the locking of the support means, is achieved in the manner described below.
The body of part 10 has pivotally mounted upon it in the manner shown a tube support 16, pivoted upon pivot 18, and a latch 20 pivoted upon pivot 22. The end face 24 of tube support 16 mounts a projecting pin 26, adapted to act as a cam follower.
The body casing 30 of part 12 of the infusion pump is provided with an integrally formed track 32 and a detent 34 in the positions shown on its inside lower face 36.
The mechanism functions in the following manner: edge of latch 26, which is at this stage still locked in engagement with tube support 16, by means of the inter-engagement of tongue 40 within detent 42 of latch 26; pivotted anti-clockwise about pivot 22, causing detent 42 to disengage from tongue 40 of tube support 16, as pin 26 engages with track 32 of casing 30; pivot clockwise as pin 26 continues to follow track 32, allowing tube 14 to enter the gap between the inner face of tube support 16 and latch 20; 44 of latch 20 falls into detent 34 of casing 30, and pin 26 rides over the highest part of track 32 and down the further side, allowing tube support 16 to rotate anti-clockwise, repositioning tongue 40 in detent 42 of latch 20.
In this way support 16, to permit pumping of infusate by mechanical compression of delivery tube 14 against that inner face of tube support 16 by the pump mechanism contained within part 1

REFERENCES:
patent: 4469481 (1984-09-01), Kobayashi
patent: 4527323 (1985-07-01), Dawson
patent: 4561830 (1985-12-01), Bradley
patent: 5017059 (1991-05-01), Davis
patent: 5088904 (1992-02-01), Okada
patent: 5511951 (1996-04-01), O'Leary

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