Carrier particles for use in dry powder inhalers
First Claim
1. A powder for use in a dry powder inhaler, the powder comprising active particles and carrier particles for carrying the active particles, the powder further comprising additive material comprising magnesium stearate, the additive material being on the surfaces of the carrier particles and the amount of additive material is such that the active particles are not liable to be released from the carrier particles before the actuation of the inhaler.
2 Assignments
0 Petitions
Accused Products
Abstract
A powder for use in a dry powder inhaler includes active particles and carrier particles for carrying the active particles. The powder further includes additive material (4) on the surfaces of the carrier particles to promote the release of the active particles from the carrier particles on actuation of the inhaler. The powder is such that the active particles are not liable to be released from the carrier particles before actuation of the inhaler. The inclusion of additive material (4) in the powder has been found to give an increased respirable fraction of the active material.
84 Citations
25 Claims
- 1. A powder for use in a dry powder inhaler, the powder comprising active particles and carrier particles for carrying the active particles, the powder further comprising additive material comprising magnesium stearate, the additive material being on the surfaces of the carrier particles and the amount of additive material is such that the active particles are not liable to be released from the carrier particles before the actuation of the inhaler.
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20. A method of producing a powder for use in dry powder inhalers, the method including the steps of
(a) mixing carrier particles of a size suitable for use in a dry powder inhaler with additive material comprising magnesium stearate such that at least some of the additive material becomes attached to the surfaces of the carrier particles; - and
(b) mixing the carrier particles with active particles such that active particles adhere to the surfaces of the carrier particles and/or the additive material, wherein the amount of additive material is such that the active particles are not liable to be released from the carrier particles before actuation of the inhaler. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification