Patent ID: 8499973

Claim:
A deformable dispensing tube having a first end portion which is closed and a second end portion with an opening through which, when the tube has been filled, contents can be dispensed by deformation of the tube, the tube comprising: a dispensing device moveable inside the tube and positioned so that on filling contents are disposed generally between the dispensing device and the opening so that upon application of an external pressure to the tube by a user contents can be dispensed through the opening; wherein the dispensing device comprises an enclosed hollow skin filled with a fluid, a top portion arranged to be in contact with the tube contents for transferring pressure between the tube contents and the fluid, and a sealing portion for applying a sealing force between the device and the tube for resisting the transgression of contents between the sealing portion and the tube; wherein the outer hollow skin has a thickness and material which is sufficiently flexible so that: (a) application of external pressure to the tube at the dispensing device generates an increase in the pressure of fluid in the skin causing the top portion to deform towards the tube opening thereby increasing the pressure of contents in the tube for dispensing the contents and causing an increased sealing force to be applied between the sealing portion and the tube; and (b) application of external pressure to the tube away from the dispensing device dispenses contents and generates an increase in pressure of contents in the tube causing the device top to deform towards the closed end of the tube thereby increasing the pressure on the fluid in the skin and causing an increased sealing force to be applied between the sealing portion and the tube.