Injection device
US4957490A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 1987 |
| Grant date | Sep 18, 1990 |
| Priority date | — |
| Expiry date | Dec 10, 2007 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/2492
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An injection device which is devised to be safer in use than many prior such devices comprises a generally cylindrical barrel section which is substantially closed at its first end but has an aperture in that end to allow an injection needle to pass through it, a needle support member to slide within the barrel section and shaped to receive one end of a liquid container such as an ampoule of anaesthetic, and a plunger mounted at the other end of the barrel section for axial movement in said section. The plunger is adapted both to express liquid from the liquid container when the plunger is advanced within the barrel and also to interconnect with either the needle support member or the liquid container, whereby withdrawal of the plunger withdraws both the liquid container and also the needle and its support member into the barrel section for disposal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.