IL45485A - Constant-flow device for intravenous infusion set - Google Patents

Abstract

1511367 Valves YARDEN MEDICAL ENG Ltd 17 July 1975 [18 Aug 1974] 30004/75 Heading F2V A flow control device, e.g. disposed between an intravenous solution container (1, Fig. 1, not shown) and a lower level sight glass (4), comprises a housing 21 having in its top a liquid inlet 31 and a vent 27 and in its bottom an outlet 36 with a manually adjustable control valve 28, flow through the inlet being stopped by a float controlled valve 33 when a predetermined liquid level is reached in the housing. Flat gasket 34 on float 24 closes outlet 36 when the level falls sufficiently after the container (1) has emptied. The device may be of diecast thermoplastic. Fig. 3 (not shown) illustrates a modified float. [GB1511367A]

Claims (5)

CLAIMSt

1. A constant-flow device for use with an intravenous' infusion set, placed into the line leading from a high- level solution container or bag to a lower-level sight glass or inspection chamber of known design, the device comprising:- a) a housing having a liquid inlet in its upper portion and a liquid outlet in its bottom portion, as weal as a vent to the outside in its upper portion, b) Valve means actuated by a float movably arranged in the housing and adapted to close the liquid inlet at a predetermined height of the liquid level in the housing, c) manually operated regulating valve means placed into the liquid outlet*

2. A constant-flow device as claimed in Claim 1 wherein the housing consists of a substantially vertical, hollow cylinder within which a cylindrical or spherical float of smaller diameter is adapted to move in vertical direction in accordance with the liquid level* A constant-flow device as claimed in Claim 1 wherein the regulating valve means consist of a needle valve screwedly movable in the housing bottom portion and bearing against a valve seat integral with the housing. $· A constant-flow device as claimed in Claim 2 wherein the seat to be closed by the float valve is in the centre of the housing top, and wherein the valve consists of a separate body in the shape of a solid vertical cylinder with its top tapered corresponding in size and shape to the valve seat. - 9 - 7426 45485/2 Claim 3

3. A constant flov device as claimed in Claim 2 comprising a housing in the shape of a substantially vertical, hollow cylinder having an outlet leading to the said regulating valve means in its bottom surface, and a cylindrical float of smaller diameter adapted to move in the cylindrical housing, which float is provided in its bottom portion with gasket means fiadapted to contact and to close the said outlet in the housing bottom, in the lowermost position of the float in the housing* τ

4. 6.

5. A constant-flow device as claimed in Claim 4 wherein the valve bod is guided in a cylindrical bore in the housing top portion coaxial with, and of a larger diameter than, the valve seat. ?.«· A constant-flow device as claimed in Claim 2 wherein the float is in the shape of a hollow cylindrical or spherical body of smaller diameter than the housing cylinder, having at least three radial ribs at its outside serving as guides within the cylindrical space of the housing cylinder. A constant-flow device as claimed in Claim 2 wherein the valve body is integral with the float body. 9.*. A constant-flow device as claimed in Claim 7 wherein the float-and-valve body is provided with at least three external guide ribs. A constant-flow device as claimed in any of the preceding Claims wherein the sight glass or inspection chamber serving to receive the liquid from the said device is provided with a vent connecting its upper space with the atmosphere. 11 -W A constant-flow device substantially as hereinbefore described and illustrated in the accompanying drawing. For the Applicant DAN BRON.