Removable needle attachment having a detachable needle
US4838870A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 8, 1987 |
| Grant date | Jun 13, 1989 |
| Priority date | — |
| Expiry date | Jun 8, 2007 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/3231
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A needle attachment to be removably attached to the distal end of a syringe cylinder. The needle attachment comprises a needle carrying hub and a coaxially aligned hypodermic needle which is retained by friction within a hole extending through the hub. The needle includes a needle stop to prevent the detachment of the needle from the hub in a distal direction through the hole. The needle terminates at a needle catch that is spaced inwardly from the distal end of the cylinder. A piston assembly having a needle capturing receptacle located at one end thereof moves axially and distally through the syringe cylinder to expulse fluid medication and to selectively engage the needle catch of the hypodermic needle at the most distal aspect of the cylinder. The piston assembly is then moved axially and proximally through the syringe cylinder to detach the hypodermic needle from the needle carrying hub and relocate said needle from the distal end to a relatively proximal position within the cylinder. The needle extends from the piston assembly with the needle catch securely anchored within the needle capturing receptacle and the needle cannula completely surrounded and shielded by the cylinde…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.