Abstract: An implantable device for releasing one or more substances into a body cavity such as a urinary bladder, is provided. The device includes an inner balloon located within an outer balloon so as to define a lumen between the outer and inner balloons. A first valve is used for filling the lumen; and a second valve is used for filling the inner balloon. The device is delivered to the body using a delivery catheter. The inner portion is filled with the substance or substances to be released into the body cavity. The outer balloon is filled with a substance that is chosen to impart a desired specific gravity to the device. The substances to be released may be contained in particles coated with a soluble coating. The particles may be in suspension or embedded in a matrix.

Abstract: An implantable device for releasing one or more substances into a body cavity such as a urinary bladder, is provided. The device includes an inner balloon located within an outer balloon so as to define a lumen between the outer and inner balloons. The interior of the inner balloon is in fluid contact with an exterior surface of the device, for example via one or more conduits passing through the lumen between the two balloons. A first valve is used for filling the lumen; and a second valve is used for filling the inner balloon. The device is delivered to the body using a delivery catheter. The inner balloon is filled with the substance or substances to be released into the body cavity. The outer balloon is filled with a substance that is chosen to impart a desired specific gravity to the device. The substances to be released may be contained in particles coated with a soluble coating. The particles may be in suspension or embedded in a matrix.