Liquid infusion apparatus
US5807337A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1995 |
| Grant date | Sep 15, 1998 |
| Priority date | — |
| Expiry date | Dec 21, 2015 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M5/14526
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The present invention relates particularly to a liquid infusion apparatus useful for infusing a medicinal liquid into a human or animal body. A liquid infusion apparatus 10 according to the present invention includes: a casing (13) having a load chamber (12) to be loaded with a liquid; a movable member (14) forming part of a wall of the load chamber (12) and adapted to reciprocate with respect to the casing (13) to vary the volume of the load chamber (12); a cylinder (21) integrally coupled to the casing (13) or the movable member (14); a piston (22) axially slidably and airtightly fitted in the cylinder (21); the casing (13) being formed with an injection port (15) and a spouting port (16) which communicate with the load chamber; the cylinder (21) and the piston (22) defining an airtight cylinder chamber (23) in a vacuum condition when the piston (22) is moved in the direction away from the cylinder (21); and the movable member (14) and the piston (22) being cooperatively interconnected through a cooperative means (25) so as to decrease the volume of the load chamber (12) in proportion to a decrease in the volume of the cylinder chamber (23).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.