Physiological pressure measuring system
US4648406A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 2, 1981 |
| Grant date | Mar 10, 1987 |
| Priority date | — |
| Expiry date | Feb 2, 2001 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/02152
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A physiological pressure measuring system usable in conjunction with an intravascular infusion line leading to a patient whose pressure is to be monitored. The system includes a detector having a transparent chamber interposed in the line and a flexible bulb mounted therein whose exterior is subjected to the fluid pressure in the chamber, the bulb interior communicating with a flexible pipe terminating in a hollow plug vented to the atmosphere whereby the bulb is caused to collapse when the infusion fluid pressure which reflects the physiologial pressure is greater than atmospheric. Associated with the detector is a fluid pressure transducer yielding a signal as a function of the applied pressure, the transducer input port being in the form of a tubular jack adapted to telescopically receive the plug. When the plug is inserted in the jack, a seal is effected to create a closed air column which exerts pressure on the transducer. The effective length of the column depends on the relative axial position of the plug; and as the plug is advanced into the jack, the column is shortened to thereby compress the air entrapped therein. A point is reached in the course of advance when the colu…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.