Surgery – Container for blood or body treating material – or means used... – Bag type
Patent
1995-08-15
1997-12-02
Weiss, John G.
Surgery
Container for blood or body treating material, or means used...
Bag type
604246, A61B 1900
Patent
active
056930402
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a bag for use in containing a liquid and from which the liquid may be dispensed. The bag is particularly directed to medical applications such as for containing a solution for intravenous or otherwise administration to a patient but not exclusively.
Conventionally a solution or blood product to be intravenously administered or otherwise dispensed is contained in a flexible flat expandable container for containing blood, blood products and the like of the type available from for example Baxter-Travenol, which is connected to a patient by a tube and a giving set using a gravity feed to dispense the solution. One of the major practical problems encountered with this type of system is that the rate of flow of solution from the bag diminishes as the amount of fluid remaining in the bag reduces and the pressure head of the solution in the bag reduces. Accordingly it is necessary for the rate of dispensing to be adjusted every now and again via the giving set to compensate for the reduction in pressure, due to the change in head of liquid.
There are commercially available electro-mechanical apparatus which dispense solutions at a more or less constant rate by pumping it at a controlled rate. Such apparatus is however cumbersome, expensive and require a power source to operate.
It is an object of the present invention to avoid or minimise one or more of the foregoing disadvantages.
The present invention provides a bag container suitable for use in dispensing liquid at a controlled rate, which bag is supportable, in use, in a dispensing attitude and which comprises a first compartment means formed and arranged for holding a main body of liquid to be dispensed, and a second compartment means formed and arranged for holding a small portion of said liquid and disposed substantially below said first compartment means in said dispensing attitude of the bag, said first compartment means being connected to an inlet of said second compartment means by a syphon conduit means, and said second compartment means being provided with outlet means for said liquid, said second compartment means with its inlet and outlet means being formed and arranged so that syphoning can be maintained in use of the bag in said dispensing attitude thereof, whereby in use, a substantially constant head of liquid is maintained in said second compartment means during dispensing of most of said liquid held in said bag container.
Thus with a bag container according to the present invention, substantially all the solution contained in the bag may be dispensed at a more or less constant rate of delivery without the need for adjustment. In this connection it will be understood that once the first compartment has been drained and/or the siphon broken, then the head in the second compartment will begin to reduce and there will then be a reduction in flow rate (see also Example hereinbelow). Accordingly it is desirable that the capacity of the second compartment should be quite small relative to that of the first compartment in order to maximise the amount of fluid held in the bag which is delivered at a substantially constant rate. In general the ratio of size between the first compartment and second compartment may be in the region of from 60:1 to 20:1, preferably from 40:1 to 30:1. Preferably said first compartment has a volume of 0.5 to 6, e.g. 0.5 to 3, liters desirably from 1 to 3, e.g. 1 to 2.5, liters. It will be appreciated though that other ratios and sizes may be used for particular applications.
The syphon conduit means may be connected and extend between said first and second compartment means in any convenient manner provided the inlet to the syphon conduit is above the outlet thereof (at the inlet to the second compartment) with said bag container in said dispensing attitude. Most preferably though said syphon conduit means extends upwardly from said inlet thereof, proximal the base of said first compartment means, (in the dispensing attitude of the bag) to a greater or lesser extent, but advantageously up tow
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East & Midlothian NHS Trust
O Ki Yong
Weiss John G.
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