Formulation delivery device
US9248240B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 14, 2009 |
| Grant date | Feb 2, 2016 |
| Priority date | — |
| Expiry date | Mar 20, 2033 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2205/8281
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The present invention provides a device for injection of formulations into a patient. In one embodiment the injection is sub-cutaneous. The device is convenient for injecting viscous formulations that would otherwise clog conventional injection devices, for example formulations containing microspheres, suspensions, and other viscous substances. Generally, the device features a needle for piercing the skin, an internal chamber for holding and transmitting fluid, a plunger for applying pressure to the internal chamber, a switch for triggering withdrawal of the needle, a sheath at least partially encompassing the needle and having a flow path within the sheath, and a spring that expands when the switch is triggered, and which thereby at least partially withdraws the needle from the sheath.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.