Aerodynamically light particles for pulmonary drug delivery
US5874064A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Oct 29, 1996 |
| Grant date | Feb 23, 1999 |
| Priority date | — |
| Expiry date | Oct 29, 2016 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K31/137
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Improved aerodynamically light particles for drug delivery to the pulmonary system, and methods for their synthesis and administration are provided. In a preferred embodiment, the aerodynamically light particles are made of a biodegradable material and have a tap density less than 0.4 g/cm.sup.3 and a mass mean diameter between 5 .mu.m and 30 .mu.m. The particles may be formed of biodegradable materials such as biodegradable polymers. For example, the particles may be formed of a functionalized polyester graft copolymer consisting of a linear .alpha.-hydroxy-acid polyester backbone having at least one amino acid group incorporated therein and at least one poly(amino acid) side chain extending from an amino acid group in the polyester backbone. In one embodiment, aerodynamically light particles having a large mean diameter, for example greater than 5 .mu.m, can be used for enhanced delivery of a therapeutic agent to the alveolar region of the lung. The aerodynamically light particles incorporating a therapeutic agent may be effectively aerosolized for administration to the respiratory tract to permit systemic or local delivery of wide variety of therapeutic agents.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.