US 4,355,639 AGranted

Apparatus for the parenteral administration of liquids at a constant, adjustable flow rate

AssigneeSis-Ter S.p.A.

InventorFrancesco Di Salvo

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Abstract

To provide for constant and easily adjusted flow rate of liquids from a container (5), which may be a flexible bag, an indexed feeding chamber (1) is directly connected by gravity with the liquid container (5) and provided with a tubular passage (12) therethrough communicating with the outside, preferably through a filter at an end and with the chamber bottom at the other end. The bottom of the feeding chamber (1) is connected to a dripping tube (1A) positioned below, which in turn communicates with the inlet (21) of a device (2) for the microregulation and stabilization of the liquid flow rate. This device, essentially consists of a holder (44) with a cavity (51) therein and two tubular inlet (41) and outlet (47) passages connecting said cavity with the outside, and having a flexible membrane (43) removably covering the opening of the outlet passage within the cavity. Device (2) is height adjustably supported by a slider (31) on a scale (3) fixed to the stand (4 ) which supports the liquid container (5).

Apparatus for the parenteral administration of a liquid at a constant, adjustable flow rate, comprising

means (5, 1) supplying said liquid under essentially constant, controlled conditions of pressure and having a supply outlet (17);
a dripping tube or funnel (1a) secured to said liquid supply means;
support means (4) supporting said dripping tube or funnel (1a) at a predetermined level or elevation;
a flow stabilization device (2) including
a body (44) formed with
a cavity (51) therein,
a tubular inlet passage (42) communicating with said cavity and a first tubing (7a) connecting said inlet passage with the bottom of said dripping tube or funnel (1a),
a tubular outlet passage (47) communicating with said cavity, and a second tubing (7b) adapted for connection of said outlet passage to a cannula (8) for administration of the liquid to a patient,
said inlet passage (42) having a smaller diameter than the outlet passage (47),
and a flexible membrane (43) closing off said cavity against ambient air and further removably covering the opening of the outlet passage (47) within the cavity;
a stationary scale (3) vertically positioned at a controlled level with respect to said predetermined level or elevation;
a slider (31) slidable vertically along said stationary scale for vertical adjustment therealong positioned at an elevation below said predetermined level or elevation supported by said slider and vertically adjustably positioned thereby;
and means (32) for securing said slider (31) and hence said stabilization device (2) in vertically adjustable position along said scale to permit reproducibly adjustably positioning of said stabilization device at a level below said predetermined level and to permit controlled flow from said dripping tube or funnel (1a) to and through said stabilization device (2) as a function of level difference between the liquid level in said dripping tube or funnel (1a) and said stabilization device.

10 more elements

Abstract

Claims12