Tissue pressure measuring device
US4209023A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 22, 1979 |
| Grant date | Jun 24, 1980 |
| Priority date | — |
| Expiry date | Feb 22, 1999 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/03
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A tissue pressure measuring device comprising, a hollow needle and a conduit communicating with the needle at a distal end thereof, with the conduit having a lumen and including a transparent portion having a reference marking. The device has a syringe having a plunger, an outer wall defining a chamber, a barrel received in the chamber and defining a cavity to slidably receive the plunger in sealing engagement with an inner surface of the barrel and permit movement of the plunger between inner and outer positions of the plunger relative to the barrel. The chamber and cavity have a combined volume substantially greater than the volume of the cavity, and the plunger has reference indicia disposed along the plunger to determine the position of the plunger relative to a reference position on the syringe. The device has a valve assembly communicating with the conduit lumen and syringe chamber, with the valve assembly selectively establishing communication between the lumen and chamber, and establishing communication between the chamber and the atmosphere while closing the lumen from the chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.