Multi-stroke delivery pumping mechanism for a drug delivery device for high pressure injections
US10258749B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 8, 2015 |
| Grant date | Apr 16, 2019 |
| Priority date | — |
| Expiry date | Jul 21, 2037 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/3152
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A dual-chambered drug delivery device, comprising a cartridge having a first chamber for storing a medicament, a second chamber in fluid communication with said first chamber, a dose setting member for setting a medicament dose to be injected at an injection site, a piston disposed in said second chamber, an upward stroke of said piston drawing a portion of the medicament dose into said second chamber and a downward stroke of said piston expelling the portion of the medicament dose, a needle communicating with said second chamber for sequentially injecting portions of the medicament dose into the injection site, a drive screw movably connected to said dose setting member such that rotation of said dose setting member moves said drive screw upwardly, and a rack movably connected to said drive screw such that downward movement of said drive screw during the medicament dose injection rotates said rack.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.