Osmotic pressure sensing head
US4028931A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 13, 1976 |
| Grant date | Jun 14, 1977 |
| Priority date | — |
| Expiry date | Feb 13, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N13/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An osmotic sensing head for measuring the osmotic pressure of protein molecules in blood, which is of the type that includes a reference chamber for holding saline solution, a sample chamber for holding blood, an osmotic membrane between the chambers, and a pressure sensor coupled to the reference chamber to measure the pressure therein. The sample chamber has a small volume and is provided with an inlet and outlet so that a storage saline solution can be removed and a blood sample introduced by merely flowing the blood sample in through the inlet while allowing the storage solution to pass out through the outlet. The inlet is directed at the membrane at an angle to help wash away material lying on the membrane. The osmotic membrane is held in slight tension by an elastomeric O-ring which presses the membrane against a conical surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.