Capsule with soluble blocking element
The invention relates to a capsule comprising an inlet and an outlet connected by a passage, in which a dissolvable blocking element and a composition to be orally administered are arranged. The blocking element is fluid permeable and, in a non-dissolved condition, is arranged in the passage to block delivery of the composition to an outlet of the passage. The invention further relates to a method for releasable sealing a capsule comprising a composition to be orally administered, comprising the steps of providing the composition chamber in a passage and filling composition into the composition chamber. The passage formed by the capsule is occluded with a blocking element and the blocking element comprises dissolvable material and has a fluid permeable structure.
1. A capsule suitable for releasably storing a composition to be administered, the capsule defining a passage, in which the composition to be administered is arranged, the capsule comprising:
a middle cut section having a substantially constant cross section and a tapered section at each end of the capsule;
a controllable blocking element in the form of a one-way valve, wherein the one-way valve is part of the capsule and comprises a plurality of movable lids obstructing an outlet of the passage at an end of the passage, the one-way valve providing a flow direction through the passage towards the outlet and blocking in the opposite flow direction, wherein the movable lids are an integrally formed part of the capsule, the moveable lids being provided by a wall section of the capsule located at one end of the capsule, the wall section having cuts to form the movable lids separated by the cuts; and
an inlet at another end of the passage opposed to the outlet as well as a fluid permeable, non-dissolvable retainer, the retainer being arranged between the composition and the inlet of the capsule to block any flow of the composition through the retainer towards the inlet, wherein the ends of the capsule are hemispherical, the cuts being axially symmetric with respect to a longitudinal axis of the capsule, and the cuts start from an apex of the hemispherical end and extending radially outward.
2. The capsule according to claim 1 , wherein the controllable blocking element is arranged between at least parts of the composition and the outlet, and/or the controllable blocking element is arranged to separate the composition from the outlet or from an external area next to the outlet.
3. The capsule according to claim 1 , wherein the one-way valve radially extends within a cross section of the outlet and being arranged at the end of the passage or at the end of the passage opposed to the outlet.
4. The capsule according to claim 1 , wherein an inner surface of the capsule enclosing the composition is formed of material being non-dissolvable in water, and wherein the one-way valve is formed of material being non-dissolvable in water or of water-dissolvable material.
5. The capsule according to claim 1 , wherein the one-way valve is a duckbill valve formed of the movable lids provided by the cut wall sections of the capsule.
6. The capsule according to claim 1 , wherein the movable lids comprises polyethylene glycol, polylactic acid, water dissolvable cellulose, or wherein the movable lids comprises at least one of a polymer, a thermoplastic, polyethene (PE), polypropene (PP), polystyrole (PS), polyvinylchloride (PVC), polyacrylnitrile (PAN), polyamide (PA), polyester (PES), polyacrylate, the movable lids being provided in a thin sheet or wall with a thickness suitable for allowing bending and opening of the movable lids upon application of a vacuum equivalent to conventional suction movements to the outlet.
7. The capsule according to claim 6 , wherein the movable lids comprise hydroxypropylmethyl cellulose, hydroxypropyl cellulose, hydrolyzed gelatine or mannite or mixtures of two or more thereof.
8. A method for releasably sealing a capsule defining a passage comprising a composition to be orally administered, the method comprising the steps of:
providing the capsule according to claim 1 ;
occluding the passage with the blocking element; and
filling the composition into a composition chamber within the passage.
9. A method for oral application of a composition to be orally administered, the method comprising the steps of:
providing a capsule defining a passage, in which the composition to be administered is arranged, the capsule comprising a controllable blocking element in the form of a one-way valve, wherein the one-way valve is part of the capsule and comprises a plurality of movable lids obstructing an outlet of the passage at an end of the passage, the one-way valve providing a flow direction through the passage towards the outlet and blocking in the opposite flow direction, wherein the movable lids are an integrally formed part of the capsule, the moveable lids being provided by a wall section of the capsule located at one end of the capsule, the wall section having cuts to form the movable lids separated by the cuts, and an inlet at another end of the passage opposed to the outlet as well as a fluid permeable, non-dissolvable retainer, the retainer being arranged between the composition and the inlet of the capsule to block any flow of the composition through the retainer towards the inlet, wherein the capsule comprises a middle section having a substantially constant cross section and a tapered section at each end of the capsule;
applying a vacuum to the outlet suitable for opening the one-way valve;
opening a passage section between the composition and the outlet for the composition; and
applying the composition to a patient through the outlet and the opened passage, wherein the ends of the capsule are hemispherical, the cuts being axially symmetric with respect to a longitudinal axis of the capsule, the cuts start from an apex of the hemispherical end and extending radially outward, the cuts separating a plurality of the movable lids, and the method further comprising opening one of the movable lids.