Infusion set including a closure means

Details Infusion set including a closure means Infusion set including a closure means

1997-04-21

1999-10-12

Coggins, Wynn Wood

Surgery

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

Treating material introduced into or removed from body...

604250, 251 7, A61M 500, F16K 704

Patent

active

059647388

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to an infusion set including a closure means for closing an infusion line, for example in a medical apparatus.


SUMMARY OF THE INVENTION

Such closure means are often provided with or incorporated in medical infusion sets and similar equipment, to prevent the free flow of infusate which may otherwise occur, for example, when an empty infusate reservoir or cassette is replaced with a full one, or when, in a pumped system, an infusion line is removed from engagement with the pump.
According to the present invention there is provided an infusion set comprising a first part, a second part for containing an infusate reservoir and infusion line, the parts been releasably attachable together, and means for closing the infusion line, the closure means being operable, by detachment of the parts, to close the infusion line. The invention therefore provides a simple and reliable anti-freeflow mechanism.
The closure means may be slidably mounted on the second part between a first, open infusion line position and a second, closed infusion line position. The infusion line may pass through an opening in the closure means and the closure means may be mounted such that in the first position the infusion line passes through a portion of the opening of dimension great enough to allow flow of infusate through the infusion line and in the second position the infusion line passes through a portion of the opening having a dimension sufficiently less than the diameter of the infusion line to occlude the infusion line. In the first position, therefore, infusate can flow freely, whereas in the second position, the infusion line-is constricted at the point at which it passes through the opening, preventing the flow of infusate. The opening may be bounded by the closure member or may be unbounded at at least one end.
The closure means may have a tongue with a detent arranged to engage a projection on the first part to slide the closure means from the first to the second position as the parts are pulled apart and further arranged to release the closure means when the parts are fully detached. The tongue and detent may be arranged to engage the projection on the first part to slide the closure means from the second position to the first position when the parts are re-attached.
The infusion set may further include a tool adapted for manual operation of the closure means.
The first part may house a pump for pumping infusate from the infusate reservoir.
Accordingly, a two-part infusion set consists, for example, of a pump unit comprised within one part, and an infusate reservoir and flexible infusion line comprised within the other part, the two parts being adapted to fit together in use. In operation, the flexible infusion line in the second part is engaged by the pump in the first part to permit the infusate to be pumped from the infusate reservoir out through the infusion line to a patient. To prevent free flow of infusate to the patient, as might otherwise occur when the first, pump, part is detached from the second, reservoir, part, means are provided operative upon detachment of the two parts, to close the infusion line and to retain it in a closed condition. In addition to preventing unwanted infusion, the infusion line can then be detached from the patient without the need to manually close off the line to prevent infusate spillage.


BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be described by way of example with reference to the embodiment illustrated in the accompanying drawings of which:
FIG. 1 is a perspective view of a two-part portable infusion pump;
FIG. 2 shows the operating elements of the anti-freeflow device applied to the pump of FIG. 1; and
FIG. 3 shows a view of the device of FIG. 2 from the other direction.


DETAILED DESCRIPTION OF THE INVENTION

Referring to the drawings, the two-part infusion pump comprises a first part 10, housing a pump and control means, together with an associated battery for powering both; and a second part 12, consisting of an upper

REFERENCES:
patent: 2889848 (1959-06-01), Redmer
patent: 4586691 (1986-05-01), Kozlow
patent: 4689043 (1987-08-01), Bisha
patent: 4932629 (1990-06-01), Rodomista et al.
patent: 5017192 (1991-05-01), Dodge et al.
patent: 5401256 (1995-03-01), Stone et al.
patent: 5453098 (1995-09-01), Botts et al.

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