High pressure injection syringe
US6916308B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 2001 |
| Grant date | Jul 12, 2005 |
| Priority date | — |
| Expiry date | May 25, 2022 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2310/00353
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A pressure injection syringe (10) with an actuator (100) that includes a plunger (102) for pressurizing viscous fluid material within a chamber (14). The plunger distal tip (112) includes a high pressure seal (110) defined by a seal member (118) within a seal seat (116). The high pressure seal (110) is viscoselective to permit air passage therepast for aspiration, and to prohibit viscous material passage therepast during actuation of the actuator wherein high pressure is applied to the material within the chamber (14). The viscoselective seal (110) may be defined for example by small axial openings (130) in the seal seat (116) that permit aspiration of air therepast during initial plunger insertion into the chamber, but fluid escape is prohibited by the seal member (118) when the seal member is pressed firmly against a collar (126) of the plunger (102) proximally adjacent the seal seat by initial engagement of the seal member with the viscous material, thus completely sealing the chamber (14) at the proximal end thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.