Gas-powered fluid injection system
US10912883B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 4, 2018 |
| Grant date | Feb 9, 2021 |
| Priority date | — |
| Expiry date | Jun 12, 2039 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/2485
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Gas-powered fluid injection systems and methods are disclosed, e.g., for delivering fluids into a patient's body. An injection device comprises a driver housing which forms and/or encloses a gas pressure source, an actuation piston driven by the gas pressure source and a hydraulic fluid pressurized by movement of the actuation piston. The hydraulic fluid flows through an adjustable valve into a plunger lumen which pushes a plunger of a fluid dispensing device, such as a syringe, to dispense an injection fluid, such as a medicament. The injection device has a movable plunger sleeve which receives the plunger of the fluid dispensing device. The plunger sleeve is moved during the activation and de-activation of the injection device such that it relieves residual pressure in the fluid dispensing device thereby preventing the fluid dispensing device from continuing to dispense injection fluid after the injection device has been de-actuated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.