Such systems often utilise a catheter for drainage of urine from a patient's bladder into a urine collection bag. Such bags require to be drained periodically, for which purpose there is usually a tap on an outlet tube. The tap is operated by the patient, nurse, or carer. The taps need to be effective in operation even for those with limited dexterity, with no leakage, to avoid soiling and possible cross- contamination, light and with the ability to avoid snagging on clothing or bed clothes.

Such taps often include a lever, but this can be separated from the system under repeated usage, which leads to failure and leakage.

It is accordingly an object of the invention to seek to mitigate this disadvantage.

According to a first aspect of the invention, there is provided a tap for a urine drainage system, comprising a body and a barrel with a through bore which is mounted in the body for rotation between a position for through flow of liquid and a position which obturates fluid flow, characterised by a lever (4) which is mounted on the body (1) for reversible rotation therearound, the arrangement being that on such rotation the barrel (2) is moveable between said two positions. According to a second aspect of the invention there is provided a urine drainage system including a tap as hereinbefore defined.

The lever and body may be snap-engaged, preferably by the lever having a peripheral flange and the barrel a circumferential groove in which the flange is snap-engaged.

There may be a lost motion connection between the lever and barrel whereby the lever can lie substantially alongside a tube of the system in each of two end, rotated positions, the lost-motion connection preferably comprising a projection from the lever received in a circumferentially longer gap in a facing end of the barrel.

Suitably there may be two spaced projections each received in a respective gap, which gaps and projections may be diametrically opposed, for a balance operation.

The lever may have an angled free end for gripping by a user, which free end may comprise a bar mounted asymmetrically with respect to the lever.

The component parts may comprise of polypropylene or other polymeric materials and the body may have a blind cylinder in which the barrel is mounted for rotation.

A tap for a urine drainage systems embodying the invention is hereinafter described, by way of example with reference to the accompanying drawings. Fig. 1 is a perspective view of the inner side, in use, of a lever of a tap according to the invention; Figs. 2 to 4 are respective elevational, end views and transverse sectional views of a barrel of the tap; and Figs. 5 to 7 are respective plan, side elevational and longitudinal sectional views of a body of the tap.

Referring to the drawings, there is shown a tap for a urine drainage system, comprising a body 1, a barrel 2 with a through bore 3 which is mounted for rotation between a position for through flow of liquid and a position which obturates fluid flow, and a lever 4 which is mounted on the body 1 for rotation therearound to move the barrel 2 between said two positions.

The body 1, barrel 2 and lever 4 comprise parts of the tap, and each is made as a separate, integral, unit or member from a polymeric material such as polypropylene in the embodiment.

The lever 4 has an arm with a free end with an asymmetrical bar 6 for grasping by a user. The other end of the lever 5 has a disc- shaped generally circular part 7 with an upstanding wall carrying a peripheral radially inwardly turned flange 8, an inner cylindrical part 9 and therebetween on a wall defining the part 9, two diametrically spaced projections, dogs or teeth 10 which are lower in height than the cylindrical part 9 and the part 7. There is a gap between a free end of each projection dog or teeth 10 and the upstanding wall of the part 7, which wall and part 9 are spaced apart radially to receive the projections, dogs or teeth 10.

The barrel 2 has the through bore 3 and is generally cylindrical with a blind end 11, the opposite open end having a wall 12 having two diametrically opposed cut-outs, gaps or notches 13 which each have a circumferential length greater than the thickness of the dogs, projections, or teeth 10 on the lever.

The through bore 3 is closed off at a side facing the open side by a cap supported by wings, this arrangement preventing flow of fluid from passing towards the open end.

The body 1 is a blind cylindrical member 15 with a part having a peripheral external groove 14.

There is an integral tube 16 projecting on either side of the member 15, forming an integral body member, part 17 of the tube having a cut away drainage outlet 18, and part 19 a toothed or barbed connector 20 for receiving an outlet tube from a urine drainage bag.

The tap is assemble by mounting the barrel 2 in the body 1, and snap engaging the lever 4 on the body 1 by snap engagement of the flange 8 in the groove 14 the projections, dogs or teeth 10 each being received in a respective gap 13.

When the lever 4 is rotated round the body 1, the groove 14 acting as a guide for the flange 8, the dogs 10 move along the gaps 13 until they strike a wall defining the blind gap, and rotate the barrel 2 to either open or obturate the flow path for liquid from the bag by aligning the bore 3 with the tube 16, or turning it at 90° thereto.

Rotational movement of the tap in the opposite or reverse direction obturates or opens the fluid flow.

The gaps 13 and dogs 10 provide a lost motion connection so that the lever 4 lies alongside the tube 16 in each end position, the longer part of the bar 6 of the lever lying over the tube 16 so as to be stowed away from possible snagging on clothing or bed clothing.

Mounting of the lever 4 on the body 1 provides a positive mounting which is separate from the barrel 2 so making it difficult for the lever 4 to be snapped off, and providing essentially a separate connection with the barrel. Thus, as the lever 4 is mounted on the body 1, the pressure on the lever 4 does not bear on the barrel, which is operated solely by the lost motion connection of the dogs 10 in the gaps 13.