Pneumatically operable injection device
US4327724A · kind A · utility
Inventors
Key dates
| Filing date | May 29, 1980 |
| Grant date | May 4, 1982 |
| Priority date | — |
| Expiry date | May 29, 2000 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M5/44
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A pneumatically operable injection device has a first pressure cylinder with a piston which is adapted to be rigidly but detachably connected to a piston of an injection syringe, and a second pressure cylinder with a piston having an extension adapted to co-operate with a three-way cock in such a manner as to cause the three-way cock to be operated by movement of its piston. Flow connections are provided between the outlet of the injection syringe and the three-way cock, between the three-way cock and a connecting piece, and between the three-way cock and an inlet of a reservoir for the substance to be injected. The device is adapted to effect either a connection between the outlet of the injection syringe and the connecting piece or between the syringe outlet and the reservoir. Compressed-air lines are provided for the purpose of pneumatically operating the pistons in the two pressure cylinders. Bleed valves disposed in the compressed-air lines are adapted to be controlled electronically in such a manner that the pneumatically effected filling step can only be initiated with the three-way cock being in the position in which it connects the syringe outlet with the reservoir and tha…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.